This page has only limited features, please log in for full access.

Prof. Dr. Anastasios Zouboulis
Professor of Chemical & Environmental Technology

Basic Info


Research Keywords & Expertise

0 Resource Recovery
0 Wastewater Treatment
0 Water Treatment
0 industrial solid waste management
0 green chemistry and technology

Fingerprints

Wastewater Treatment
Water Treatment
industrial solid waste management

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

Dr. Anastasios I. Zouboulis is (Full) Professor of Chemical & Environmental Technology, Department of Chemistry, Aristotle University, Thessaloniki (GR) since 2007. He is performing research in the fields of water and wastewater treatment technologies, including Environmental Biotechnology, wastewater management, reclamation and reuse, as well as in industrial toxic solid wastes stabilization and/or recovery/reuse options. He is author/co-author of more than 250 papers, published in refereed scientific journals, and of more than 150 papers published in the Proceedings of National & International conferences, attracting more than 12.000 citations, according to Google Scholar (current Scopus H-factor 48, Google Scholar 60). He has supervised 11 Ph.D. (defended), 25 M.Sc. Theses and more than 70 Diploma theses. He has participated in more than 75 national and international research and demonstration projects, funded by E.U. as well as from local sources (ministries, industries, companies

Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 28 August 2021 in Materials
Reads 0
Downloads 0

The Microbiologically Induced Corrosion (MIC) of concrete sewer pipes is a commonly known problem that can lead to the destruction of the system, creating multiple public health issues and the need for costly repair investments. The present study focuses on the development of a magnesium hydroxide coating, with optimized properties to protect concrete against MIC. The anti-corrosion properties of the respective coating were evaluated by using short and long duration accelerated sulfuric acid spraying tests. The coating presented satisfying adhesion ability, based on pull-off and Scanning Electron Microscopy (SEM) analysis measurements. The surface pH of the coated concrete was maintained at the alkaline region (i.e., >8.0) throughout the duration of all acid spraying tests. The consumption of the coating, due to the reaction (neutralization) with sulfuric acid, was confirmed by the respective mass and thickness measurements. The protection ability of this coating was also evaluated by recording the formation of gypsum (i.e., the main corrosion product of concrete) during the performed tests, by X-ray Diffraction (XRD) analysis and by the Attenuated Total Reflectance (ATR) measurements. Finally, a long duration acid spraying test was additionally used to evaluate the behavior of the coating, simulating better the conditions existing in a real sewer pipe, and the obtained results showed that this coating is capable of offering prolonged protection to the concrete substrate.

ACS Style

Domna Merachtsaki; Eirini-Chrysanthi Tsardaka; Eleftherios Anastasiou; Anastasios Zouboulis. Evaluation of the Protection Ability of a Magnesium Hydroxide Coating against the Bio-Corrosion of Concrete Sewer Pipes, by Using Short and Long Duration Accelerated Acid Spraying Tests. Materials 2021, 14, 4897 .

AMA Style

Domna Merachtsaki, Eirini-Chrysanthi Tsardaka, Eleftherios Anastasiou, Anastasios Zouboulis. Evaluation of the Protection Ability of a Magnesium Hydroxide Coating against the Bio-Corrosion of Concrete Sewer Pipes, by Using Short and Long Duration Accelerated Acid Spraying Tests. Materials. 2021; 14 (17):4897.

Chicago/Turabian Style

Domna Merachtsaki; Eirini-Chrysanthi Tsardaka; Eleftherios Anastasiou; Anastasios Zouboulis. 2021. "Evaluation of the Protection Ability of a Magnesium Hydroxide Coating against the Bio-Corrosion of Concrete Sewer Pipes, by Using Short and Long Duration Accelerated Acid Spraying Tests." Materials 14, no. 17: 4897.

Journal article
Published: 29 June 2021 in Membranes
Reads 0
Downloads 0

This is the first study that examines the effect of operating conditions on fouling of Membrane Bio-Reactors (MBRs), which treat municipal wastewater in field conditions, with specific regard to the controlled development of filamentous microorganisms (or filaments). The novelty of the present work is extended to minimize the dissolved oxygen (DO) in recirculated activated sludge for improving the process of denitrification. For this purpose, two pilot-scale MBRs were constructed and operated in parallel: (i) Filament-MBR, where an attempt was made to regulate the growth of filaments by adjustment of DO, the Food-to-Microorganisms (F/M) ratio and temperature, and (ii) Control-MBR, where a gentle stirring tank was employed for the purpose of zeroing the DO in the recycled sludge. Results showed that low temperature (<15 °C) slightly increased the number of filaments in the Filament-MBR which, in turn, decreased the Trans-Membrane Pressure (TMP). As the Soluble Microbial Products (SMP) and the colloids are considered to be the basic foulants of membranes in MBR systems, specific attention was directed to keep their concentration at low values in the mixed liquor. The low F/M ratio in the aeration tanks which preceded the membrane tank was achieved to keep the SMP proteins and carbohydrates at very low values in the mixed liquor, i.e., less than 6 mg/L. Moreover, as a result of the low recirculation rate (2.6∙Qin), good aggregation of the produced excess sludge was achieved, and low concentration of colloids with a size ≤50 nm (nearly the membranes’ pore size used for filtration/separation) was measured, accounted for maximum 15% of the total colloids. Additionally, the increase in filamentous population at the Filament-MBR contributed to the further reduction of colloids in the mixed liquor at 7.9%, contributing beneficially to the reduction of TMP and of membrane fouling. The diminishing of DO in the recirculated sludge improved denitrification, and resulted in lower concentrations of Ν-NO3 and TN in the effluent of the Control-MBR. Furthermore, the recirculation rate of Qr = 2.6∙Qin, in comparison with Qr = 4.3∙Qin, resulted in improved performance regarding the removal of N-NH4+. Finally, high organics removal and ammonium nitrification was observed in the effluent of both pilots, since COD and Ν-ΝH4+ concentrations were generally in the range of 10–25 mg/L and <0.1 mg/L, respectively.

ACS Style

Petros Gkotsis; Dimitra Banti; Anastasia Pritsa; Manassis Mitrakas; Petros Samaras; Efrosini Peleka; Anastasios Zouboulis. Effect of Operating Conditions on Membrane Fouling in Pilot-Scale MBRs: Filaments Growth, Diminishing Dissolved Oxygen and Recirculation Rate of the Activated Sludge. Membranes 2021, 11, 490 .

AMA Style

Petros Gkotsis, Dimitra Banti, Anastasia Pritsa, Manassis Mitrakas, Petros Samaras, Efrosini Peleka, Anastasios Zouboulis. Effect of Operating Conditions on Membrane Fouling in Pilot-Scale MBRs: Filaments Growth, Diminishing Dissolved Oxygen and Recirculation Rate of the Activated Sludge. Membranes. 2021; 11 (7):490.

Chicago/Turabian Style

Petros Gkotsis; Dimitra Banti; Anastasia Pritsa; Manassis Mitrakas; Petros Samaras; Efrosini Peleka; Anastasios Zouboulis. 2021. "Effect of Operating Conditions on Membrane Fouling in Pilot-Scale MBRs: Filaments Growth, Diminishing Dissolved Oxygen and Recirculation Rate of the Activated Sludge." Membranes 11, no. 7: 490.

Journal article
Published: 28 April 2021 in Water
Reads 0
Downloads 0

Several coatings and linings have been examined and used for the protection of sewer concrete pipes, against mainly biogenic-provoked corrosion due to the production of bio-sulfuric acid, leading to the degradation of the pipes’ structure and eventually, to their collapse and need for costly replacement. This study aimed to examine the potential differences between five different magnesium hydroxide coatings, prepared from powders presenting different purity, surface area and pore size distribution, when applied as corrosion protection agents. These coatings were tested by using accelerated sulfuric acid spraying tests, both in dry and wet coating conditions. The coating adhesion ability and their microstructure were examined by the application of pull-off measurements and of SEM analysis, respectively and were found to present certain differences, regarding the adhesion ability and the surface morphologies. During the acid spraying procedure, the surface pH and the mass change of coated concrete specimens were recorded daily. The surface pH was reduced towards acidic values and the mass reduction approached almost −20% in comparison with the initial coating mass for certain cases. Additionally, the hardness and roughness of concrete surface under the coating layer (i.e., the interface between the coating and the surface) after four days of acid spraying, exhibited much smaller changes (due to protection) in contrast to the uncoated concrete specimens (used as blank/comparison experiments), which were found to be highly affected/corroded. The formation of concrete corrosion and coating by-products, as noticed after the respective chemical reactions, was recorded by X-ray diffraction (XRD) measurements and the respective quantification of obtained results. In all the coated specimens only very small amounts of the major by-product (gypsum) was observed, indicating that the concrete surface was sufficiently protected from sulfuric acid attack.

ACS Style

Domna Merachtsaki; Eirini-Chrysanthi Tsardaka; Eleftherios Anastasiou; Haris Yiannoulakis; Anastasios Zouboulis. Comparison of Different Magnesium Hydroxide Coatings Applied on Concrete Substrates (Sewer Pipes) for Protection against Bio-Corrosion. Water 2021, 13, 1227 .

AMA Style

Domna Merachtsaki, Eirini-Chrysanthi Tsardaka, Eleftherios Anastasiou, Haris Yiannoulakis, Anastasios Zouboulis. Comparison of Different Magnesium Hydroxide Coatings Applied on Concrete Substrates (Sewer Pipes) for Protection against Bio-Corrosion. Water. 2021; 13 (9):1227.

Chicago/Turabian Style

Domna Merachtsaki; Eirini-Chrysanthi Tsardaka; Eleftherios Anastasiou; Haris Yiannoulakis; Anastasios Zouboulis. 2021. "Comparison of Different Magnesium Hydroxide Coatings Applied on Concrete Substrates (Sewer Pipes) for Protection against Bio-Corrosion." Water 13, no. 9: 1227.

Journal article
Published: 01 March 2021 in Separations
Reads 0
Downloads 0

The research on selenium presence in water resources has revealed the need to determine the respective aquatic species. As selenium oxyanions SeO3 2− (SeIV) and SeO4 2− (SeVI) predominate in natural waters, their determination is essential, mainly due to different ecotoxicity properties, as well as to different removal options from relevant-polluted waters. This study focuses on the SeO3 2−/SeO4 2− speciation/separation and determination through the selective adsorption of SeO3 2− only onto specific iron oxy-hydroxides (FeOOHs). For this purpose, the laboratory prepared FeOOHs examined along with the commercially available relevant material (Bayoxide), which was found to present optimum results for the speciation of selenium oxyanions, at the low concentration range 10–100 μg/L, using a dose of 0.5 g/L of adsorbent and gently stirring for 30 min at the usually encountered pH value of 7.3 ± 0.2. Moreover, the relevant experiments showed that the other major ions Cl−, HCO3 −, NO3 −, SO4 2−, Ca2+, Mg2+, Na+, possibly found in most natural waters at the concentration range 0–200 mg/L, as well as silicon, total organic carbon (TOC) of natural organic matter (NOM) and iron at the concentration range 0–50 mg/L, 0–5 mg/L and 0–1 mg/L, respectively, did not interfere with the selective adsorption of Se(IV). Furthermore, the most important advantage of this selective speciation method is its implementation/combination with all commonly applied analytical methods for the determination of total selenium.

ACS Style

Kyriaki Kalaitzidou; Evangelia Bidiou; Anastasios Zouboulis; Manassis Mitrakas. Speciation and Determination of Selenium Oxyanions at the Drinking Water Pollution Concentration Levels. Separations 2021, 8, 27 .

AMA Style

Kyriaki Kalaitzidou, Evangelia Bidiou, Anastasios Zouboulis, Manassis Mitrakas. Speciation and Determination of Selenium Oxyanions at the Drinking Water Pollution Concentration Levels. Separations. 2021; 8 (3):27.

Chicago/Turabian Style

Kyriaki Kalaitzidou; Evangelia Bidiou; Anastasios Zouboulis; Manassis Mitrakas. 2021. "Speciation and Determination of Selenium Oxyanions at the Drinking Water Pollution Concentration Levels." Separations 8, no. 3: 27.

Entry
Published: 21 January 2021 in Encyclopedia
Reads 0
Downloads 0

Catalytic membrane ozonation is a hybrid process that combines membrane filtration and catalytic ozonation. The membrane deposited with an appropriate solid material acts as catalyst. As a consequence, the catalytic membrane contactor can act simultaneously as contactor (i.e., improving the transfer/dissolution of gaseous ozone into the liquid phase), as well as reactor (i.e., oxidizing the organic compounds). It can be used in water and wastewater treatment limiting the disadvantages of membrane filtration (i.e., lower removal rates of emerging contaminants or fouling occurrence) and ozonation (i.e., selective oxidation, low mineralization rates, or bromate (BrO3−) formation). The catalytic membrane ozonation process can enhance the removal of micropollutants and bacteria, inhibit or decrease the BrO3− formation and additionally, restrict the membrane fouling (i.e., the major/common problem of membranes’ use). Nevertheless, the higher operational cost is the main drawback of these processes.

ACS Style

Savvina Psaltou; Manassis Mitrakas; Anastasios Zouboulis. Catalytic Membrane Ozonation. Encyclopedia 2021, 1, 131 -143.

AMA Style

Savvina Psaltou, Manassis Mitrakas, Anastasios Zouboulis. Catalytic Membrane Ozonation. Encyclopedia. 2021; 1 (1):131-143.

Chicago/Turabian Style

Savvina Psaltou; Manassis Mitrakas; Anastasios Zouboulis. 2021. "Catalytic Membrane Ozonation." Encyclopedia 1, no. 1: 131-143.

Journal article
Published: 07 January 2021 in Applied Sciences
Reads 0
Downloads 0

A combination of thermal (500–750 °C in air) and hydrometallurgical (acidic) treatments have been applied to dried tannery sludge, resulting in the initial conversion of Cr(III) to Cr(VI) and its subsequent leaching as wastewater with high Cr(VI) concentration content (3000–6000 mg/L), presenting an extraction efficiency over 90%. The optimal electrochemical conditions for the subsequent Cr(VI) reduction with respect to acid concentration and acid kind were established by applying appropriate rotating disc electrode (RDE) experiments, using a glassy carbon (GC) electrode, and found to be equal or higher than 0.5 M H2SO4 (for the respective Cr(III) concentration range studied). The result from leaching Cr(VI) wastewater was further treated in small electrochemical bench-scale reactor for its conversion back to Cr(III) form, potentially reusable in the tanning industry. Ti-based anodes and a reticulated vitreous carbon (RVC) cathode were used to treat small (350–800 mL) samples in batch, as well as in batch-recirculation prototype electrochemical reactors, under the application of constant current or appropriately applied potential to achieve Cr(VI) conversion/reduction efficiency over 95%.

ACS Style

Evgenios Kokkinos; Aggeliki Banti; Ioanna Mintsouli; Aikaterini Touni; Sotiris Sotiropoulos; Anastasios Zouboulis. Combination of Thermal, Hydrometallurgical and Electrochemical Tannery Waste Treatment for Cr(III) Recovery. Applied Sciences 2021, 11, 532 .

AMA Style

Evgenios Kokkinos, Aggeliki Banti, Ioanna Mintsouli, Aikaterini Touni, Sotiris Sotiropoulos, Anastasios Zouboulis. Combination of Thermal, Hydrometallurgical and Electrochemical Tannery Waste Treatment for Cr(III) Recovery. Applied Sciences. 2021; 11 (2):532.

Chicago/Turabian Style

Evgenios Kokkinos; Aggeliki Banti; Ioanna Mintsouli; Aikaterini Touni; Sotiris Sotiropoulos; Anastasios Zouboulis. 2021. "Combination of Thermal, Hydrometallurgical and Electrochemical Tannery Waste Treatment for Cr(III) Recovery." Applied Sciences 11, no. 2: 532.

Journal article
Published: 15 December 2020 in Sustainability
Reads 0
Downloads 0

In order to enhance the efficiency of heterogeneous catalytic ozonation, the effect of thermal treatment on three commonly used and inexpensive minerals, i.e., zeolite, talc and kaolin (clay), which present different physicochemical properties as potential catalysts, has been examined for the removal of para-chlorobenzoic acid (p-CBA). p-CBA is considered a typical micro-pollutant, usually serving as an indicator (model compound) to evaluate the production of hydroxyl radicals in ozonation systems. The catalytic activity of selected solid catalysts was studied for different pH values (6, 7 and 8) and different temperatures (15 °C, 25 °C and 35 °C). The mechanism of radicals’ production was also verified by the addition of tert-butyl alcohol (TBA). The respective thermal behavior study showed that the point of zero charge (PZC) of these minerals increased with the increase of applied treatment temperature, as it removed crystalline water and hydroxyls, thus improving their hydrophobicity. Circa-neutral surface charge and the presence of hydrophobicity were found to favor the affinity of ozone with solid/catalytic surfaces and the subsequent production of hydroxyl radicals. Therefore, zeolite and talc, presenting PZC 7.2 and 6.5 respectively, showed higher catalytic activity after thermal treatment, while kaolin with PZC equal to 3.1 showed zero to moderate catalytic efficiency. The degradation level of p-CBA by oxidation was favored at 25 °C, while the pH value exerted positive effects when it was increased up to 8.

ACS Style

Savvina Psaltou; Efthimia Kaprara; Kyriaki Kalaitzidou; Manassis Mitrakas; Anastasios Zouboulis. The Effect of Thermal Treatment on the Physicochemical Properties of Minerals Applied to Heterogeneous Catalytic Ozonation. Sustainability 2020, 12, 10503 .

AMA Style

Savvina Psaltou, Efthimia Kaprara, Kyriaki Kalaitzidou, Manassis Mitrakas, Anastasios Zouboulis. The Effect of Thermal Treatment on the Physicochemical Properties of Minerals Applied to Heterogeneous Catalytic Ozonation. Sustainability. 2020; 12 (24):10503.

Chicago/Turabian Style

Savvina Psaltou; Efthimia Kaprara; Kyriaki Kalaitzidou; Manassis Mitrakas; Anastasios Zouboulis. 2020. "The Effect of Thermal Treatment on the Physicochemical Properties of Minerals Applied to Heterogeneous Catalytic Ozonation." Sustainability 12, no. 24: 10503.

Journal article
Published: 23 November 2020 in Materials
Reads 0
Downloads 0

The biological activity occurring in urban sewerage systems usually leads to the (biogenic) corrosion of pipe infrastructure. Anti-corrosion coating technology was developed in an effort to protect sewer pipes from degradation. This study evaluates a new class of relatively low-cost magnesium hydroxide-based coatings, regarding their ability to adhere efficiently onto the concrete surface, and offer efficient corrosion protection. Six magnesium hydroxide-based coatings were prepared with the addition of two different types of cellulose, used as adhesion additives, and these were applied on concrete specimens. Pull-off measurements showed that the addition of higher amounts of cellulose could improve the coating adhesion onto the concrete surface. An accelerated sulfuric acid spraying test was used to evaluate the consumption time of the applied coatings and their efficiency in maintaining over time slightly alkaline pH values (above 8) on the coated/protected surfaces. At the end of spraying test, a mineralogical analysis of surface samples was performed, indicating that the formation of corrosion by-products (mainly gypsum) was increased when the added amount of cellulose was lower. Hardness and roughness measurements were also conducted on the concrete surfaces, revealing that the coatings helped the concrete surface to preserve its initial surface properties, in comparison to the uncoated specimens. A SEM/microstructure analysis showed that aggregates were formed (possibly consisting of Mg(OH)2), affecting the reactivity of the protected surface against sulfuric acid attack.

ACS Style

Domna Merachtsaki; Georgios Fytianos; Efthimios Papastergiadis; Petros Samaras; Haris Yiannoulakis; Anastasios Zouboulis. Properties and Performance of Novel Mg(OH)2-Based Coatings for Corrosion Mitigation in Concrete Sewer Pipes. Materials 2020, 13, 5291 .

AMA Style

Domna Merachtsaki, Georgios Fytianos, Efthimios Papastergiadis, Petros Samaras, Haris Yiannoulakis, Anastasios Zouboulis. Properties and Performance of Novel Mg(OH)2-Based Coatings for Corrosion Mitigation in Concrete Sewer Pipes. Materials. 2020; 13 (22):5291.

Chicago/Turabian Style

Domna Merachtsaki; Georgios Fytianos; Efthimios Papastergiadis; Petros Samaras; Haris Yiannoulakis; Anastasios Zouboulis. 2020. "Properties and Performance of Novel Mg(OH)2-Based Coatings for Corrosion Mitigation in Concrete Sewer Pipes." Materials 13, no. 22: 5291.

Journal article
Published: 21 November 2020 in Processes
Reads 0
Downloads 0

Using moderate populations of filaments in the biomass of Membrane Bio-Reactors (MBRs) is a biological anti-fouling method which has been increasingly applied over the last few years. This study aims to quantify the effect of COD to TN ratio, Dissolved Oxygen (DO) concentration and temperature on filaments’ population and Trans-Membrane Pressure (TMP) in a pilot-scale MBR, with a view to reducing membrane fouling. The novelty of the present work concerns the development of a mathematical equation that correlates fouling rate (dTMP/dt) with the population of filamentous microorganisms, assessed by the Filament Index (FI), and with the concentration of the carbohydrate fraction of Soluble Microbial Products (SMPc). Apart from TMP and SMPc, other fouling-related biomass characteristics, such as sludge filterability and settleability, were also examined. It was shown that at high COD to TN ratio (10:1), low DO concentration in the filaments’ tank (0.5 ± 0.3 mg/L) and high temperature (24–30 °C), a moderate population of filaments is developed (FI = 1–2), which delays the TMP rise. Under these conditions, sludge filterability and settleability were also enhanced. Finally, TMP data analysis showed that the fouling rate is affected by FI and SMPc concentration mainly in the long-term fouling stage and increases exponentially with their increase.

ACS Style

Petros Gkotsis; Giannis Lemonidis; Manassis Mitrakas; Alexandros Pentedimos; Margaritis Kostoglou; Anastasios Zouboulis. Quantifying the Effect of COD to TN Ratio, DO Concentration and Temperature on Filamentous Microorganisms’ Population and Trans-Membrane Pressure (TMP) in Membrane Bio-Reactors (MBR). Processes 2020, 8, 1514 .

AMA Style

Petros Gkotsis, Giannis Lemonidis, Manassis Mitrakas, Alexandros Pentedimos, Margaritis Kostoglou, Anastasios Zouboulis. Quantifying the Effect of COD to TN Ratio, DO Concentration and Temperature on Filamentous Microorganisms’ Population and Trans-Membrane Pressure (TMP) in Membrane Bio-Reactors (MBR). Processes. 2020; 8 (11):1514.

Chicago/Turabian Style

Petros Gkotsis; Giannis Lemonidis; Manassis Mitrakas; Alexandros Pentedimos; Margaritis Kostoglou; Anastasios Zouboulis. 2020. "Quantifying the Effect of COD to TN Ratio, DO Concentration and Temperature on Filamentous Microorganisms’ Population and Trans-Membrane Pressure (TMP) in Membrane Bio-Reactors (MBR)." Processes 8, no. 11: 1514.

Review
Published: 22 October 2020 in Water
Reads 0
Downloads 0

Membrane filtration has been widely used in water and wastewater treatment. However, this process is not very effective for the removal of refractory organic compounds (e.g., of pharmaceutical origin). Coupling membrane filtration with ozonation (or other Advanced Oxidation Methods) can enhance the degradation of these compounds and, subsequently, the incidence of membrane fouling (i.e., the major problem of membrane uses) would be also limited. Ozonation is an efficient oxidative process, although ozone is considered to be a rather selective oxidant agent and sometimes it presents quite low mineralization rates. An improvement of this advanced oxidation process is catalytic ozonation, which can decrease the by-product formation via the acceleration of hydroxyl radicals production. The hydroxyl radicals are unselective oxidative species, presenting high reaction constants with organic compounds. An efficient way to couple membrane filtration with catalytic ozonation is the deposition of an appropriate solid catalyst onto the membrane surface. However, it must be noted that only metal oxides have been used as catalysts in this process, while the membrane material can be of either polymeric or ceramic origin. The relevant studies regarding the application of polymeric membranes are rather scarce, because only a few polymeric materials can be ozone-resistant and the deposition of metal oxides on their surface presents several difficulties (e.g., affinity etc.). The respective literature about catalytic membrane ozonation is quite limited; however, some studies have been performed concerning membrane fouling and the degradation of micropollutants, which will be presented in this review. From the relevant results it seems that this hybrid process can be an efficient technology both for the reduction of fouling occurrence as well as of enhancement of micropollutant removal, when compared to the application of single filtration or ozonation.

ACS Style

Savvina Psaltou; Anastasios Zouboulis. Catalytic Ozonation and Membrane Contactors—A Review Concerning Fouling Occurrence and Pollutant Removal. Water 2020, 12, 2964 .

AMA Style

Savvina Psaltou, Anastasios Zouboulis. Catalytic Ozonation and Membrane Contactors—A Review Concerning Fouling Occurrence and Pollutant Removal. Water. 2020; 12 (11):2964.

Chicago/Turabian Style

Savvina Psaltou; Anastasios Zouboulis. 2020. "Catalytic Ozonation and Membrane Contactors—A Review Concerning Fouling Occurrence and Pollutant Removal." Water 12, no. 11: 2964.

Journal article
Published: 22 October 2020 in Minerals
Reads 0
Downloads 0

The importance of magnesite for the EU economy and industry is very high, making the understanding of their genesis for the exploration for new deposits a priority for the raw materials scientific community. In this direction, the study of the magnesite-hosting ultramafic rocks can be proved very useful. For the present study, ultramafic rock samples were collected from the magnesite ore-hosting ophiolite of the Gerakini mining area (Chalkidiki, Greece) to investigate the consecutive alteration events of the rocks which led to the metallogenesis of the significant magnesite ores of the area. All samples were subjected to a series of analytical methods for the determination of their mineralogical and geochemical characteristics: optical microscopy, XRD, SEM, EMPA, ICP–MS/OES and CIPW normalization. The results of these analyses revealed that the ultramafic rocks of the area have not only all been subjected to serpentinization, but these rocks have also undergone carbonation, silification and clay alteration. The latter events are attributed to the circulation of CO2-rich fluids responsible for the formation of the magnesite ores and locally, the further alteration of the serpentinites into listvenites. The current mineralogy of these rocks was found to be linked to one or more alteration event that took place, thus a significant contribution to the metallo- and petrogenetic history of the Gerakini ophiolite has been made. Furthermore, for the first time in literature, Fe inclusions in olivines from Greece were reported.

ACS Style

Evangelos Tzamos; Micol Bussolesi; Giovanni Grieco; Pietro Marescotti; Laura Crispini; Andreas Kasinos; Niccolò Storni; Konstantinos Simeonidis; Anastasios Zouboulis. Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece). Minerals 2020, 10, 934 .

AMA Style

Evangelos Tzamos, Micol Bussolesi, Giovanni Grieco, Pietro Marescotti, Laura Crispini, Andreas Kasinos, Niccolò Storni, Konstantinos Simeonidis, Anastasios Zouboulis. Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece). Minerals. 2020; 10 (11):934.

Chicago/Turabian Style

Evangelos Tzamos; Micol Bussolesi; Giovanni Grieco; Pietro Marescotti; Laura Crispini; Andreas Kasinos; Niccolò Storni; Konstantinos Simeonidis; Anastasios Zouboulis. 2020. "Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece)." Minerals 10, no. 11: 934.

Paper
Published: 06 August 2020 in Environmental Science: Water Research & Technology
Reads 0
Downloads 0

Dead end membrane operation maximizes O3 dissolution.

ACS Style

Efthimia Kaprara; Margaritis Kostoglou; Chrysovalantou Koutsiantzi; Savvina Psaltou; Anastasios I. Zouboulis; Manassis Mitrakas. Enhancement of ozonation efficiency employing dead-end hollow fiber membranes. Environmental Science: Water Research & Technology 2020, 6, 1 .

AMA Style

Efthimia Kaprara, Margaritis Kostoglou, Chrysovalantou Koutsiantzi, Savvina Psaltou, Anastasios I. Zouboulis, Manassis Mitrakas. Enhancement of ozonation efficiency employing dead-end hollow fiber membranes. Environmental Science: Water Research & Technology. 2020; 6 (9):1.

Chicago/Turabian Style

Efthimia Kaprara; Margaritis Kostoglou; Chrysovalantou Koutsiantzi; Savvina Psaltou; Anastasios I. Zouboulis; Manassis Mitrakas. 2020. "Enhancement of ozonation efficiency employing dead-end hollow fiber membranes." Environmental Science: Water Research & Technology 6, no. 9: 1.

Chapter
Published: 06 August 2020 in Textile Science and Clothing Technology
Reads 0
Downloads 0

In tanning procedures, the main and most widely currently used reagent for skin/hide treatment is the trivalent chromium salt (usually the sulfate one). However, the low yield of the reactions, taking place in the respective chromium bath, commonly results in a significant proportion of this metal, passing unused into the corresponding wastes (mostly wastewater, but also to some extension in the solid waste). These wastes are considered as hazardous, and their sustainable management is recommended/enforced by international and national legislative organizations. An attractive approach to address this issue is the application of circular economy principles, where the Cr(III) content of wastewaters can be appropriately recovered and then reused again into the tanning process, as raw material. The chromium-rich tannery wastes, in which Cr(III) recovery has been examined, are mainly the tanning liquor and the resulting sludge from the physicochemical/biological treatment of wastewater stream. Regarding the tanning liquor, the treatment technique that shows the highest efficiency and also applied in the field is precipitation. This method requires the addition of an appropriate alkaline media in order to increase the solution’s pH and to precipitate Cr(OH)3; subsequently, this precipitate can be re-dissolved in sulfuric acid, before feeding it back to the tanning bath. On the other hand, the most effective technology for chromium recovery from the tannery sludge is the selective, mainly acidic dissolution of chromium by applying simple hydrometallurgical principles, followed by precipitation and eventually re-dissolution, before reuse.

ACS Style

Evgenios Kokkinos; Anastasios I. Zouboulis. The Chromium Recovery and Reuse from Tanneries: A Case Study According to the Principles of Circular Economy. Textile Science and Clothing Technology 2020, 123 -157.

AMA Style

Evgenios Kokkinos, Anastasios I. Zouboulis. The Chromium Recovery and Reuse from Tanneries: A Case Study According to the Principles of Circular Economy. Textile Science and Clothing Technology. 2020; ():123-157.

Chicago/Turabian Style

Evgenios Kokkinos; Anastasios I. Zouboulis. 2020. "The Chromium Recovery and Reuse from Tanneries: A Case Study According to the Principles of Circular Economy." Textile Science and Clothing Technology , no. : 123-157.

Review
Published: 30 July 2020 in Sustainability
Reads 0
Downloads 0

Although Greece has accomplished wastewater infrastructure construction to a large extent, as 91% of the country’s population is already connected to urban wastewater treatment plants (WWTPs), many problems still need to be faced. These include the limited reuse of treated wastewater and of the surplus sludge (biosolids) produced, the relative higher energy consumption in the existing rather aged WWTPs infrastructure, and the proper management of failing or inadequately designed septic tank/soil absorption systems, still in use in several (mostly rural) areas, lacking sewerage systems. Moreover, the wastewater treatment sector should be examined in the general framework of sustainable environmental development; therefore, Greece’s future challenges in this sector ought to be reconsidered. Thus, the review of Greece’s urban wastewater history, even from the ancient times, up to current developments and trends, will be shortly addressed. This study also notes that the remaining challenges should be analyzed in respect to the country’s specific needs (e.g., interaction with the extensive tourism sector), as well as to the European Union’s relevant framework policies and to the respective international technological trends, aiming to consider the WWTPs not only as sites for the treatment/removal of pollutants to prevent environmental pollution, but also as industrial places where energy is efficiently used (or even produced), resources’ content can be potentially recovered and reused (e.g., nutrients, treated water, biosolids), and environmental sustainability is being practiced overall.

ACS Style

Charikleia Prochaska; Anastasios Zouboulis. A Mini-Review of Urban Wastewater Treatment in Greece: History, Development and Future Challenges. Sustainability 2020, 12, 6133 .

AMA Style

Charikleia Prochaska, Anastasios Zouboulis. A Mini-Review of Urban Wastewater Treatment in Greece: History, Development and Future Challenges. Sustainability. 2020; 12 (15):6133.

Chicago/Turabian Style

Charikleia Prochaska; Anastasios Zouboulis. 2020. "A Mini-Review of Urban Wastewater Treatment in Greece: History, Development and Future Challenges." Sustainability 12, no. 15: 6133.

Journal article
Published: 30 June 2020 in C
Reads 0
Downloads 0

This study presents for the first time the synthesis and characterization of GO (graphene oxide), PFSiC (polyferric silicate chloride), and hybrid GO-PFSiC derivatives, aiming to enhance synergistically the performance of coagulation, when applied for the treatment of water. The structure and the morphology of composite GO-PFSiC coagulants were studied in detail by the application of FTIR, XRD, and SEM characterization techniques. Furthermore, the proposed coagulants were applied for the treatment of simulated turbid surface water. The effects of the reagent’s dosage, pH value, and experimental/operational conditions on the coagulation efficiency, applied mainly for the removal of turbidity, were examined. The results, obtained from the FTIR and XRD measurements, showed the presence of a bond between the PFSiC and the GO surface, indicating that the PFSiC particles are distributed uniformly on the surface of graphene, which was also confirmed by the SEM images. Especially, the composite compound GO-PFSiC1.5-15-0.5 presents the most uniform distribution of iron on the surface of graphene oxide and exhibits the optimum coagulation efficiency, while it significantly reduces the turbidity for doses above 3–5 mg/L, i.e., achieving the respective legislation limit as proposed by WHO. Specifically, at the alkaline pH values (>7.9), the removal of turbidity reaches 96%. Consequently, the results of this study render these materials as potential coagulant agents for further research and applications, aiming to also achieve the co-removal of other water components.

ACS Style

Athanasia K. Tolkou; Anastasios I. Zouboulis. Graphene Oxide/Fe-Based Composite Pre-Polymerized Coagulants: Synthesis, Characterization, and Potential Application in Water Treatment. C 2020, 6, 44 .

AMA Style

Athanasia K. Tolkou, Anastasios I. Zouboulis. Graphene Oxide/Fe-Based Composite Pre-Polymerized Coagulants: Synthesis, Characterization, and Potential Application in Water Treatment. C. 2020; 6 (3):44.

Chicago/Turabian Style

Athanasia K. Tolkou; Anastasios I. Zouboulis. 2020. "Graphene Oxide/Fe-Based Composite Pre-Polymerized Coagulants: Synthesis, Characterization, and Potential Application in Water Treatment." C 6, no. 3: 44.

Journal article
Published: 23 June 2020 in Journal of Environmental Chemical Engineering
Reads 0
Downloads 0

This study provides a realistic estimation of uptake efficiency and operational cost for Se(IV) removal by the two most promising processes: coagulation/precipitation with iron salts and adsorption onto iron oxy-hydroxides granules. Removal efficiency at pH 7 and temperature 20 °C, corresponding to residual Se(IV) concentrations below the drinking water regulation limit 10 μg/L, was used to estimate the coagulant cost at approximately 357 €/kg Se(IV) removed, while the corresponding FeOOH cost, applying a single step adsorption process, was estimated at 2222 €/kg Se(IV) removed; however, the later was substantially decreased, and being lower than the coagulant treatment cost, when more than 5 adsorption/regeneration/reuse cycles were performed. Furthermore, the analysis of operational cost for a medium-scale drinking water plant, treating 100 m3/h with initial concentration 100 μg Se(IV)/L indicates that coagulation/precipitation process presents an operational cost of 104 €/103 m3, which is more than twice lower than the application of a single adsorption step (being 236 €/103 m3). Contrary, the operational cost of adsorption process is competitive to coagulation/precipitation process for treating 100 m3/h because of the lower energy and labor costs. The utilization of adsorbents on the commonly applied throwaway basis can be cost effective for an initial concentration below 30 μg Se(IV)/L, while for initial concentrations 50 and 100 μg/L the cost of adsorption is lower than coagulation’s after 2 and 5 cycles of reuse, respectively. In conclusion, the scenario of adsorbent regeneration and reuse is necessary in order to narrow the cost gap between coagulation/precipitation and adsorption processes.

ACS Style

Kyriaki Kalaitzidou; Anastasios Zouboulis; Manassis Mitrakas. Cost evaluation for Se(IV) removal, by applying common drinking water treatment processes: Coagulation/precipitation or adsorption. Journal of Environmental Chemical Engineering 2020, 8, 104209 .

AMA Style

Kyriaki Kalaitzidou, Anastasios Zouboulis, Manassis Mitrakas. Cost evaluation for Se(IV) removal, by applying common drinking water treatment processes: Coagulation/precipitation or adsorption. Journal of Environmental Chemical Engineering. 2020; 8 (5):104209.

Chicago/Turabian Style

Kyriaki Kalaitzidou; Anastasios Zouboulis; Manassis Mitrakas. 2020. "Cost evaluation for Se(IV) removal, by applying common drinking water treatment processes: Coagulation/precipitation or adsorption." Journal of Environmental Chemical Engineering 8, no. 5: 104209.

Correction
Published: 18 May 2020 in Water
Reads 0
Downloads 0

The authors wish to make the following corrections to this paper

ACS Style

Muhammad Usman; Ioannis Katsoyiannis; Manassis Mitrakas; Anastasios Zouboulis; Mathias Ernst. Correction: Usman, M., et al. Performance Evaluation of Small Sized Powdered Ferric Hydroxide as Arsenic Adsorbent. Water 2018, 10, 957. Water 2020, 12, 1430 .

AMA Style

Muhammad Usman, Ioannis Katsoyiannis, Manassis Mitrakas, Anastasios Zouboulis, Mathias Ernst. Correction: Usman, M., et al. Performance Evaluation of Small Sized Powdered Ferric Hydroxide as Arsenic Adsorbent. Water 2018, 10, 957. Water. 2020; 12 (5):1430.

Chicago/Turabian Style

Muhammad Usman; Ioannis Katsoyiannis; Manassis Mitrakas; Anastasios Zouboulis; Mathias Ernst. 2020. "Correction: Usman, M., et al. Performance Evaluation of Small Sized Powdered Ferric Hydroxide as Arsenic Adsorbent. Water 2018, 10, 957." Water 12, no. 5: 1430.

Journal article
Published: 11 May 2020 in Science of The Total Environment
Reads 0
Downloads 0

The qualitative and quantitative characterization of several mining by-product samples, were collected from the magnesite mine of “Grecian Magnesite SA” company (Gerakini, Chalkidiki, North Greece), was aiming to evaluate the possibility of upgrading their refractory properties by applying thermal treatment. The concentration range of main components for the selected best qualified samples was 38.7–43 wt% for MgO, 37.5–44.1 wt% for SiO2 and 6.5–7.3 wt% for FeO. The mineralogical characterization revealed the presence of olivine, pyroxenes and serpentine, with the concentration of the latter positively correlated to LOI. Microprobe analyses clarified the presence of olivine [(Mg1.79Fe0.19Ni0.01)SiO4], consisting mainly of 90 wt% of forsterite (Mg2SiO4) and 10 wt% of fayalite (Fe2SiO4), as well as of pyroxene group minerals [(Mg0.87Fe0.08Ca0.01Cr0.01)(Si0.98Al0.04)O3], consisting mainly of 91 wt% enstatite (MgSiO3) and 9 wt% of ferrosilite (FeSiO3), respectively. The thermal treatment of the qualified samples demonstrated that at the temperature of 650–680 °C serpentine is almost totally decomposed and at the temperature of 850 °C it has been totally recrystallized to olivine and pyroxenes. At higher temperature treatment (1300 °C), it seems that there is a recrystallization process that favors the deformation of olivine and the further formation of pyroxenes, due to the excess of Si available from the initial decomposition of serpentine, while the presence of magnesite resulted to the restriction of olivine deformation through the partial capture of available Si. For increasing the olivine percentage and, subsequently, the improvement of refractory properties of this material, at temperature > 1300°C, the ideal theoretical addition dose of wt% MgO for optimizing the formation of olivine was calculated, ranging from 7.4 to 17.5 wt%. The latter calculations are reported for the first time in the literature regarding this kind of materials.

ACS Style

Ε. Pagona; E. Tzamos; G. Grieco; A. Zouboulis; M. Mitrakas. Characterization and evaluation of magnesite ore mining by-products of Gerakini mines (Chalkidiki, N. Greece). Science of The Total Environment 2020, 732, 139279 .

AMA Style

Ε. Pagona, E. Tzamos, G. Grieco, A. Zouboulis, M. Mitrakas. Characterization and evaluation of magnesite ore mining by-products of Gerakini mines (Chalkidiki, N. Greece). Science of The Total Environment. 2020; 732 ():139279.

Chicago/Turabian Style

Ε. Pagona; E. Tzamos; G. Grieco; A. Zouboulis; M. Mitrakas. 2020. "Characterization and evaluation of magnesite ore mining by-products of Gerakini mines (Chalkidiki, N. Greece)." Science of The Total Environment 732, no. : 139279.

Review
Published: 07 May 2020 in Applied Sciences
Reads 0
Downloads 0

Groundwater is commonly used as a drinking water resource all over the world. Therefore, groundwater contamination by toxic metals is an important issue of utmost concern for public health, and several technologies are applied for their effective removal, such as coagulation, ion exchange, adsorption, and membrane applications like reverse osmosis. Adsorption is acknowledged as a simple, effective and economic technology, which has received increased interest recently, despite certain limitations regarding operational applications. The respective scientific efforts have been specifically focused on the development and implementation of novel nano-structured adsorbent materials, which may offer extensive specific surface areas, much higher than the conventional adsorbents, and hence, are expected to present higher removal efficiencies of pollutants. In this paper, the recent developments of nanomaterial applications for arsenic, chromium and uranium removal from groundwaters are critically reviewed. Particularly, the use of novel composite materials, based mainly on hybrid metallic oxide nanoparticles and on composites based on graphene oxide (GO) (i.e., graphene-based hybrids), showed promising evidences to achieve efficient removal of toxic metals from water sources, even in full scale applications.

ACS Style

Athanasia K. Tolkou; Ioannis A. Katsoyiannis; Anastasios I. Zouboulis. Removal of Arsenic, Chromium and Uranium from Water Sources by Novel Nanostructured Materials Including Graphene-Based Modified Adsorbents: A Mini Review of Recent Developments. Applied Sciences 2020, 10, 3241 .

AMA Style

Athanasia K. Tolkou, Ioannis A. Katsoyiannis, Anastasios I. Zouboulis. Removal of Arsenic, Chromium and Uranium from Water Sources by Novel Nanostructured Materials Including Graphene-Based Modified Adsorbents: A Mini Review of Recent Developments. Applied Sciences. 2020; 10 (9):3241.

Chicago/Turabian Style

Athanasia K. Tolkou; Ioannis A. Katsoyiannis; Anastasios I. Zouboulis. 2020. "Removal of Arsenic, Chromium and Uranium from Water Sources by Novel Nanostructured Materials Including Graphene-Based Modified Adsorbents: A Mini Review of Recent Developments." Applied Sciences 10, no. 9: 3241.

Journal article
Published: 28 April 2020 in Water
Reads 0
Downloads 0

The aim of this study was the investigation of alternative pre-polymerized coagulants for the treatment of high-strength industrial wastewaters, such as those created by tanneries, or by yeast production industries. The novel inorganic composite coagulant examined in this study (as well as variations of it) was denoted as PSiFAC1.5-10-15. The contribution of a typical polyelectrolyte to improve the effectiveness of the coagulation/flocculation (C/F) process was additionally studied, either by adding it separately (i.e., as a flocculant aid) or by co-polymerizing it within the structure of inorganic coagulant (denoted as PAPEFAC1.5-10-15). It was found that the PSiFAC1.5:10:15 coagulant, either with or without the addition of polyelectrolyte, can provide better efficiency for the C/F process than the conventional coagulants. For example, the addition of 80 mg Al/L in yeast production wastewater samples resulted in a 56% reduction of COD, 40% of turbidity, and 43% of phosphates, regarding the pre-treated anaerobically wastewater samples and reduced by an extra 22%, 14%, and 38% for the pre-treated anaerobically plus aerobically wastewater samples, respectively. The residual aluminum concentration in the treated wastewaters was found to be below the legislation limit of 200 μg Al/L. The characterization of coagulants showed the relatively higher Al13 content of 51% and 43% for the cases of PSiFAC1.5-10-15 and PAPEFAC1.5-10-15, respectively, accompanied by the high zeta-potential measurements (50.5 and 39.5 mV).

ACS Style

Athanasia K. Tolkou; Anastasios I. Zouboulis. Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters. Water 2020, 12, 1258 .

AMA Style

Athanasia K. Tolkou, Anastasios I. Zouboulis. Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters. Water. 2020; 12 (5):1258.

Chicago/Turabian Style

Athanasia K. Tolkou; Anastasios I. Zouboulis. 2020. "Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters." Water 12, no. 5: 1258.