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Dr. Katsoyiannis is Professor of Environmental Technology at the department of Chemistry of Aristotle University of Thessaloniki. He is the President of the Hellenic Industrial Property Academy, chair of the division of Chemistry and Environment of the European Chemical Society (EuChemS) and Executive Board member of EuChemS. He is an expert in water and wastewater treatment, water reuse and circular economy. He was recipient of prestigious international fellowhsips, such as from Alexander von Humboldt Foundation, German Academic Exchange Service (DAAD), the Swiss Science National Foundation and recipient of a Marie Curie Individual. He has conducted research at the Technical University of Berlin, Technical University of Hamburg, the ETH Zurich and the EPFL. Between 2008 and 2014 he has worked as principal chemical engineer for the giant engineering companies Alstom Power and Hitachi Power Europe in the design, construction and commissioning of some of the bigger power plants in Europe. He is the author of more than 65 research papers, which have received to date more than 4500 citations with an H-index of 32. He is scientific responsible in several research projects and has been invited more than 20 times to give lectures worldwide in international conferences and advanced schools. In 2019, he was the chair of the 17th International Conference on Chemistry and the Environment, which is the official environmental conference of the European Chemical Society (EuChemS).
To date, energy recovery from biological sewage sludge (BSS) by anaerobic digestion has been very popular. However, it can often happen that anaerobic reactors are volumetrically undersized, thus reducing performance in terms of biogas production. A continuous-flow pilot-scale plant was used to investigate, for the first time, the effects of mesophilic anaerobic co-digestion (MACoD) of sewage sludge and aqueous residue (AR) from a biosolids treatment plant (BTP) on methanogenic activity under low hydraulic retention time (HRT) conditions (to simulate the undersizing of the reactor). The results showed that the digestate is always more rapidly biodegradable than the matrices fed, while particulate COD hydrolyzed (12 ± 1.3%) is independent of the quantity of AR dosed. Feeding over 35% of soluble OLR, the total VFAs in the system strongly decreased, despite the low HRT. In correspondence with higher dosages of AR, the percentage of CH4 increased up to 77–78% and the CO2 CH4−1 ratio decreased to 0.25 ± 0.2. Specific methane production increased from 0.09 ± 0.01 m3CH4 kgCODremoved−1 with BSS alone to 0.28 ± 0.01 m3CH4CH4 kgCODremoved−1 in the case of BSS co-digested with AR. Moreover, co-digestion with AR from a BTP allowed continuous specific methanogenic activity to be enhanced from 1.76 ± 0.02 m3CH4 tVSS−1 d−1 to 6.48 ± 0.88 m3CH4 tVSS−1 d−1. Therefore, the MACoD of BSS and AR from a BTP could be a good solution to enhance methanogenic activity in a volumetrically undersized anaerobic digester with reduced HRT.
Vincenzo Torretta; Athanasia Tolkou; Ioannis Katsoyiannis; Francesca Caccamo; Marco Miino; Marco Baldi; Maria Collivignarelli. Enhancement of Methanogenic Activity in Volumetrically Undersized Reactor by Mesophilic Co-Digestion of Sewage Sludge and Aqueous Residue. Sustainability 2021, 13, 7728 .
AMA StyleVincenzo Torretta, Athanasia Tolkou, Ioannis Katsoyiannis, Francesca Caccamo, Marco Miino, Marco Baldi, Maria Collivignarelli. Enhancement of Methanogenic Activity in Volumetrically Undersized Reactor by Mesophilic Co-Digestion of Sewage Sludge and Aqueous Residue. Sustainability. 2021; 13 (14):7728.
Chicago/Turabian StyleVincenzo Torretta; Athanasia Tolkou; Ioannis Katsoyiannis; Francesca Caccamo; Marco Miino; Marco Baldi; Maria Collivignarelli. 2021. "Enhancement of Methanogenic Activity in Volumetrically Undersized Reactor by Mesophilic Co-Digestion of Sewage Sludge and Aqueous Residue." Sustainability 13, no. 14: 7728.
In recent years, there has been an increase in public perception of the detrimental side-effects of fluoride to human health due to its effects on teeth and bones. Today, there is a plethora of techniques available for the removal of fluoride from drinking water. Among them, adsorption is a very prospective method because of its handy operation, cost efficiency, and high selectivity. Along with efforts to assist fluoride removal from drinking waters, extensive attention has been also paid to the accurate measurement of fluoride in water. Currently, the analytical methods that are used for fluoride determination can be classified into chromatographic methods (e.g., ionic chromatography), electrochemical methods (e.g., voltammetry, potentiometry, and polarography), spectroscopic methods (e.g., molecular absorption spectrometry), microfluidic analysis (e.g., flow injection analysis and sequential injection analysis), titration, and sensors. In this review article, we discuss the available techniques and the ongoing effort for achieving enhanced fluoride removal by applying novel adsorbents such as carbon-based materials (i.e., activated carbon, graphene oxide, and carbon nanotubes) and nanostructured materials, combining metals and their oxides or hydroxides as well as natural materials. Emphasis has been given to the use of lanthanum (La) in the modification of materials, both activated carbon and hybrid materials (i.e., La/Mg/Si-AC, La/MA, LaFeO3 NPs), and in the use of MgO nanostructures, which are found to exhibit an adsorption capacity of up to 29,131 mg g−1. The existing analytical methodologies and the current trends in analytical chemistry for fluoride determination in drinking water are also discussed.
Athanasia Tolkou; Natalia Manousi; George Zachariadis; Ioannis Katsoyiannis; Eleni Deliyanni. Recently Developed Adsorbing Materials for Fluoride Removal from Water and Fluoride Analytical Determination Techniques: A Review. Sustainability 2021, 13, 7061 .
AMA StyleAthanasia Tolkou, Natalia Manousi, George Zachariadis, Ioannis Katsoyiannis, Eleni Deliyanni. Recently Developed Adsorbing Materials for Fluoride Removal from Water and Fluoride Analytical Determination Techniques: A Review. Sustainability. 2021; 13 (13):7061.
Chicago/Turabian StyleAthanasia Tolkou; Natalia Manousi; George Zachariadis; Ioannis Katsoyiannis; Eleni Deliyanni. 2021. "Recently Developed Adsorbing Materials for Fluoride Removal from Water and Fluoride Analytical Determination Techniques: A Review." Sustainability 13, no. 13: 7061.
Phosphorus depletion represents a significant problem. Ash of incinerated biological sewage sludge (BSS) contains P, but the presence of heavy metals (e.g., Fe and Al) is the main issue. Based on chemical characterization by SEM-EDS, ED-XRF and ICP-OES techniques, the characteristics and P content of bottom ash (BA) and fly ash (FA) of incinerated BSS were very similar. On BA, P extraction carried out in counter- current with an S:L ratio of 1:10 and H2SO4 0.5 M led to better extraction yields than those of a similar test with H2SO4 1 M and an S:L ratio of 1:5 (93% vs. 86%). Comparing yields with H2SO4 0.5 M (S:L ratio of 1:10), the counter-current method gave better results than those of the crossflow method (93% vs. 83.9%), also improving the performance obtained with HCl in crossflow (93% vs. 89.3%). The results suggest that the purification of the acid extract from heavy metals with pH variation was impractical due to metal precipitation as phosphates. Extraction with H2SO4 and subsequent treatment with isoamyl alcohol represented the best option to extract and purify P, leading to 81% extraction yields of P with low amounts of metals.
Marco Baldi; Andrea Martinotti; Sabrina Sorlini; Ioannis Katsoyiannis; Alessandro Abbà; Marco Carnevale Miino; Maria Collivignarelli. Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge. Water 2021, 13, 1102 .
AMA StyleMarco Baldi, Andrea Martinotti, Sabrina Sorlini, Ioannis Katsoyiannis, Alessandro Abbà, Marco Carnevale Miino, Maria Collivignarelli. Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge. Water. 2021; 13 (8):1102.
Chicago/Turabian StyleMarco Baldi; Andrea Martinotti; Sabrina Sorlini; Ioannis Katsoyiannis; Alessandro Abbà; Marco Carnevale Miino; Maria Collivignarelli. 2021. "Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge." Water 13, no. 8: 1102.
The present special issue collected articles that address the very important topic of innovative approaches in water and wastewater treatment technologies. Thirteen articles are published, ten research paper and three review articles. The papers can be divided in four major categories, namely, membrane treatment, adsorption studies, advanced oxidation processes and wastewater treatment optimization. In the editorial, a brief description of the findings of each paper is presented along with a critical assessment.
Ioannis Katsoyiannis; Vincenzo Torretta. Innovative Approaches for Drinking- and Waste-Water Treatment: An Editorial Review Summarizing and Assessing the Findings of the Special Issue. Applied Sciences 2021, 11, 2063 .
AMA StyleIoannis Katsoyiannis, Vincenzo Torretta. Innovative Approaches for Drinking- and Waste-Water Treatment: An Editorial Review Summarizing and Assessing the Findings of the Special Issue. Applied Sciences. 2021; 11 (5):2063.
Chicago/Turabian StyleIoannis Katsoyiannis; Vincenzo Torretta. 2021. "Innovative Approaches for Drinking- and Waste-Water Treatment: An Editorial Review Summarizing and Assessing the Findings of the Special Issue." Applied Sciences 11, no. 5: 2063.
In water and wastewater, phosphate anions are considered critical contaminants because they cause algae blooms and eutrophication. The present work aims at studying the removal of phosphate anions from aqueous solutions using silica particles functionalized with polyethylenimine. The parameters affecting the adsorption process such as pH, initial concentration, adsorbent dose, and the presence of competitive anions, such as carbonate, nitrate, sulfate and chromate ions, were studied. Equilibrium studies were carried out to determine their sorption capacity and the rate of phosphate ions uptake. The adsorption isotherm data fitted well with the Langmuir and Sips model. The maximum sorption capacity was 41.1 mg/g at pH 5, which decreased slightly at pH 7. The efficiency of phosphate removal adsorption increased at lower pH values and by increasing the adsorbent dose. The maximum phosphate removal was 80% for pH 5 and decreased to 75% for pH 6, to 73% for pH 7 and to 70% for pH 8, for initial phosphate concentration at about 1 mg/L and for a dose of adsorbent 100 mg/L. The removal rate was increased with the increase of the adsorbent dose. For example, for initial phosphate concentration of 4 mg/L the removal rate increased from 40% to 80% by increasing the dose from 0.1 to 2.0 g/L at pH 7. The competitive anions adversely affected phosphate removal. Though they were also found to be removed to a certain extent. Their co-removal provided an adsorbent which might be very useful for treating waters with low-level multiple contaminant occurrence in natural or engineered aquatic systems.
Maria Xanthopoulou; Dimitrios Giliopoulos; Nikolaos Tzollas; Konstantinos Triantafyllidis; Margaritis Kostoglou; Ioannis Katsoyiannis. Phosphate Removal Using Polyethylenimine Functionalized Silica-Based Materials. Sustainability 2021, 13, 1502 .
AMA StyleMaria Xanthopoulou, Dimitrios Giliopoulos, Nikolaos Tzollas, Konstantinos Triantafyllidis, Margaritis Kostoglou, Ioannis Katsoyiannis. Phosphate Removal Using Polyethylenimine Functionalized Silica-Based Materials. Sustainability. 2021; 13 (3):1502.
Chicago/Turabian StyleMaria Xanthopoulou; Dimitrios Giliopoulos; Nikolaos Tzollas; Konstantinos Triantafyllidis; Margaritis Kostoglou; Ioannis Katsoyiannis. 2021. "Phosphate Removal Using Polyethylenimine Functionalized Silica-Based Materials." Sustainability 13, no. 3: 1502.
Arsenic (As) and chromate (Cr(VI)) contamination of ground and surface waters is a major problem worldwide. Given that a new drinking water limit is anticipated for Cr(VI) and that the limit of arsenic in drinking water is quite low (10 μg/L), there is an urgent need for evaluating technologies that could be efficient for removal of both contaminants simultaneously. In this work, the use of Fe(II) redox assisted coagulation was investigated to simultaneously remove the contaminants of interest. The basic principle of this technology is that Fe(II) could react with Cr(VI) and form Fe(III)-hydroxides and insoluble Cr(III) species, while the freshly formed Fe(III) hydroxides are very efficient adsorbents for As(V). The effect of pH, the water matrix composition, Fe(II) dose, initial contaminant concentrations, NOM presence and phosphate concentration were the examined parameters. The results revealed that with a dose of 2 mg/L Fe(II), residual As(V) and Cr(VI) concentrations were both below 10 μg/L, from initial concentrations of 50 μg/L. Though, this is effective only at circumneutral pH values. This is however not a big obstacle, since most natural waters, especially groundwaters, have near neutral pH values. At these pH values, residual iron concentration was far below 200 μg/L. The presence of phosphate anions inhibited As(V) removal but had no effect on Cr(VI) removal. Increasing Fe(II) concentrations eliminated the effect of phosphate and provided simultaneous phosphate removal. Therefore, Fe(II) coagulation can be applied, with secured results, for simultaneous As(V), Cr(VI) and phosphate removal from waters.
Asterios Laskaridis; Ioannis Sarakatsianos; Nikolaos Tzollas; Ioannis Katsoyiannis. Simultaneous Removal of Arsenate and Chromate from Ground- and Surface- Waters by Iron-Based Redox Assisted Coagulation. Sustainability 2020, 12, 5394 .
AMA StyleAsterios Laskaridis, Ioannis Sarakatsianos, Nikolaos Tzollas, Ioannis Katsoyiannis. Simultaneous Removal of Arsenate and Chromate from Ground- and Surface- Waters by Iron-Based Redox Assisted Coagulation. Sustainability. 2020; 12 (13):5394.
Chicago/Turabian StyleAsterios Laskaridis; Ioannis Sarakatsianos; Nikolaos Tzollas; Ioannis Katsoyiannis. 2020. "Simultaneous Removal of Arsenate and Chromate from Ground- and Surface- Waters by Iron-Based Redox Assisted Coagulation." Sustainability 12, no. 13: 5394.
The authors wish to make the following corrections to this paper
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 StyleMuhammad 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 StyleMuhammad 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.
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.
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 StyleAthanasia 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 StyleAthanasia 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.
Studies about the measurement of outdoor tobacco smoke (OTS) are limited to a few very recent studies. In many countries around the world, within public buildings, smoking is prohibited by law. However, these prohibitions often drive smokers to move to the border of the areas where smoking is forbidden, typically the entrances of buildings, in order to smoke. When many smokers stand outdoors near the entrances, a significant “wall” of smoke is generated. This condition exposes nonsmokers to smoke and contaminates the indoor environment too. Such a situation is amplified if the outdoor external area is covered. This paper presents a work carried out in a university campus, near building entrances, with the aim of studying the second-hand smoke (SHS) exposure in outdoor conditions. Measurements of particulate matter in specific environmental conditions are evaluated to estimate the OTS impacts on the students and the academic staff. The results showed that the exposure to tobacco can be very high and even comparable to values found when tests were carried out indoors, at the same distances from the smokers. A discussion about forbidding smoking near the entrances of public buildings is reported, including considerations about the environmental and public health concerns induced by SHS exposure and the smoking activity.
Vincenzo Torretta; Athanasia Tolkou; Ioannis Katsoyiannis; Marco Schiavon. Second-Hand Smoke Exposure Effects on Human Health: Evaluation of PM10 Concentrations in the External Areas of a University Campus. Sustainability 2020, 12, 2948 .
AMA StyleVincenzo Torretta, Athanasia Tolkou, Ioannis Katsoyiannis, Marco Schiavon. Second-Hand Smoke Exposure Effects on Human Health: Evaluation of PM10 Concentrations in the External Areas of a University Campus. Sustainability. 2020; 12 (7):2948.
Chicago/Turabian StyleVincenzo Torretta; Athanasia Tolkou; Ioannis Katsoyiannis; Marco Schiavon. 2020. "Second-Hand Smoke Exposure Effects on Human Health: Evaluation of PM10 Concentrations in the External Areas of a University Campus." Sustainability 12, no. 7: 2948.
Chromium(VI) (Cr(VI)) is the main chromium species found in groundwater and is considered as a highly toxic and carcinogenic element to humans. In the present study, removal of Cr(VI) by coagulation with ferrous iron is studied in a continuous flow treatment unit comprising pipe flocculation reactors followed by a sand filter. The studied parameters, regarding their effect on the removal of hexavalent chromium, were the ferrous iron dose, the effect of linear velocity, and the effect of the starting Cr(VI) concentration. The experiments have shown that the Cr(VI) removal achieved was very efficient and residual Cr(VI) and total Cr concentration in the treated water was lower than 10 μg/L, provided that the required dose of ferrous iron is provided. In particular, the study demonstrated that the removal of hexavalent chromium, from initial concentration of 50 μg/L and 100 μg/L, was more than 90% with ferrous doses of 1 mg/L and 2 mg/L respectively, applying linear velocity of 8 m/h, at an initial pH value of 7.3. Iron concentration in treated water was very low, far below 200 μg/L, which is the limit for iron in drinking water. This unit comprises a simple treatment option, for applications at the household level, with minimum maintenance requirements capable of removing Cr(VI) to concentrations below 10 μg/L, which might be the future limit for chromium in drinking water.
Ioannis A. Katsoyiannis; Maria Xanthopoulou; Anastasios I. Zouboulis. Cr(VI) Femoval from Ground Waters by Ferrous Iron Redox-Assisted Coagulation in a Continuous Treatment Unit Comprising a Plug Flow Pipe Reactor and Downflow Sand Filtration. Applied Sciences 2020, 10, 802 .
AMA StyleIoannis A. Katsoyiannis, Maria Xanthopoulou, Anastasios I. Zouboulis. Cr(VI) Femoval from Ground Waters by Ferrous Iron Redox-Assisted Coagulation in a Continuous Treatment Unit Comprising a Plug Flow Pipe Reactor and Downflow Sand Filtration. Applied Sciences. 2020; 10 (3):802.
Chicago/Turabian StyleIoannis A. Katsoyiannis; Maria Xanthopoulou; Anastasios I. Zouboulis. 2020. "Cr(VI) Femoval from Ground Waters by Ferrous Iron Redox-Assisted Coagulation in a Continuous Treatment Unit Comprising a Plug Flow Pipe Reactor and Downflow Sand Filtration." Applied Sciences 10, no. 3: 802.
The issues concerning the management of sewage sludge produced in wastewater treatment plants are becoming more important in Europe due to: (i) the modification of sludge quality (biological and chemical sludge are often mixed with negative impacts on sludge management, especially for land application); (ii) the evolution of legislation (landfill disposal is banned in many European countries); and (iii) the technologies for energy and material recovery from sludge not being fully applied in all European Member States. Furthermore, Directive 2018/851/EC introduced the waste hierarchy that involved a new strategy with the prevention in waste production and the minimization of landfill disposal. In this context, biological sewage sludge can be treated in order to produce more stabilized residues: the biosolids. In some European countries, the reuse of biosolids as soil improver/fertilizer in arable crops represents the most used option. In order to control the quality of biosolids used for land application, every Member State has issued a national regulation based on the European directive. The aim of this work is to compare the different approaches provided by European Member States for the reuse of biosolids in agricultural soils. A focus on the regulation of countries that reuse significant amount of biosolids for land application was performed. Finally, a detailed study on Italian legislation both at national and regional levels is reported.
Maria Collivignarelli; Alessandro Abbà; Andrea Frattarola; Marco Carnevale Miino; Sergio Padovani; Ioannis Katsoyiannis; Vincenzo Torretta. Legislation for the Reuse of Biosolids on Agricultural Land in Europe: Overview. Sustainability 2019, 11, 6015 .
AMA StyleMaria Collivignarelli, Alessandro Abbà, Andrea Frattarola, Marco Carnevale Miino, Sergio Padovani, Ioannis Katsoyiannis, Vincenzo Torretta. Legislation for the Reuse of Biosolids on Agricultural Land in Europe: Overview. Sustainability. 2019; 11 (21):6015.
Chicago/Turabian StyleMaria Collivignarelli; Alessandro Abbà; Andrea Frattarola; Marco Carnevale Miino; Sergio Padovani; Ioannis Katsoyiannis; Vincenzo Torretta. 2019. "Legislation for the Reuse of Biosolids on Agricultural Land in Europe: Overview." Sustainability 11, no. 21: 6015.
Fluoride, an anionic pollutant, is possibly to be found in excessive concentrations especially in groundwaters and can show detrimental effects on human health, in concentrations higher than the commonly applied legislation limit of 1.5 mg/L The most commonly applied method for water de-fluoridation is performed by Al-based coagulants, which however presents some important limitations, such as the applied relatively high dosage, producing rather excessive amounts of chemical sludge. In this study, the use of novel pre-polymerized Al-based coagulants was examined, regarding their efficiency towards fluoride removal, as compared with the conventionally applied AlCl3. The novel coagulants were characterized by measuring the main physico-chemical properties, the aluminum species distribution, the zeta potential, the particles' size distribution and the produced flocs’ sizes. The results showed that the Mg-containing coagulant (PSiFAC-Mg30-10-15) was the most efficient, when applied in pH values relevant to fluoride-containing groundwaters; it was also the only coagulant, which increases its efficiency at pH values > 7. The uptake capacity of coagulants, regarding fluoride, to reach the residual/equilibrium concentration limit of 1.5 mg F/L (Q1.5-value) at the pH value 7.0 ± 0.1 were found 170, 134 and 94 mg F/g Al for the cases of PSiFAC-Mg30-10-15, AlCl3·6H2O and PSiFAC-Na1.5-10-15, respectively. Accordingly, at the pH value 7.8 ± 0.2 the Q1.5-values were found 189, 118 and 41 mg F/g Al for the same coagulants; whereas considering the residual aluminum concentration this was ranged at 15 ± 5, 25 ± 5 and 30 ± 5 μg Al/L, respectively. In addition, (beneficial) increase of residual magnesium concentration, when applying the coagulant PSiFAC-Mg30-10-15 was 15 ± 5 mg/L.
Athanasia K. Tolkou; Manassis Mitrakas; Ioannis A. Katsoyiannis; Mathias Ernst; Anastasios I. Zouboulis. Fluoride removal from water by composite Al/Fe/Si/Mg pre-polymerized coagulants: Characterization and application. Chemosphere 2019, 231, 528 -537.
AMA StyleAthanasia K. Tolkou, Manassis Mitrakas, Ioannis A. Katsoyiannis, Mathias Ernst, Anastasios I. Zouboulis. Fluoride removal from water by composite Al/Fe/Si/Mg pre-polymerized coagulants: Characterization and application. Chemosphere. 2019; 231 ():528-537.
Chicago/Turabian StyleAthanasia K. Tolkou; Manassis Mitrakas; Ioannis A. Katsoyiannis; Mathias Ernst; Anastasios I. Zouboulis. 2019. "Fluoride removal from water by composite Al/Fe/Si/Mg pre-polymerized coagulants: Characterization and application." Chemosphere 231, no. : 528-537.
The present Special Issue brought together recent research findings from renowned scientists in this field and assembled contributions on advanced technologies that have been applied to the treatment of wastewater and drinking water, with an emphasis on novel membrane treatment technologies. The 12 research contributions highlight various processes and technologies that can achieve the effective treatment and purification of wastewater and drinking water, aiming (occasionally) for water reuse. The published papers can be classified into three major categories. (a) First, there are those that investigate the application of membrane treatment processes, either directly or in hybrid processes. The role of organic matter presence and fouling control is the main aim of the research in some of these studies. (b) Second, there are studies that investigate the application of adsorptive processes for the removal of contaminants from waters, such as arsenic, antimony, or chromate, with the aim of the efficient removal of the toxic contaminants from water or wastewater. (c) Lastly, there are studies that include novel aspects of oxidative treatment such as bubbleless ozonation.
Anastasios I. Zouboulis; Ioannis A. Katsoyiannis. Recent Advances in Water and Wastewater Treatment with Emphasis in Membrane Treatment Operations. Water 2018, 11, 45 .
AMA StyleAnastasios I. Zouboulis, Ioannis A. Katsoyiannis. Recent Advances in Water and Wastewater Treatment with Emphasis in Membrane Treatment Operations. Water. 2018; 11 (1):45.
Chicago/Turabian StyleAnastasios I. Zouboulis; Ioannis A. Katsoyiannis. 2018. "Recent Advances in Water and Wastewater Treatment with Emphasis in Membrane Treatment Operations." Water 11, no. 1: 45.
The small sized powdered ferric oxy-hydroxide, termed Dust Ferric Hydroxide (DFH), was applied in batch adsorption experiments to remove arsenic species from water. The DFH was characterized in terms of zero point charge, zeta potential, surface charge density, particle size and moisture content. Batch adsorption isotherm experiments indicated that the Freundlich model described the isothermal adsorption behavior of arsenic species notably well. The results indicated that the adsorption capacity of DFH in deionized ultrapure water, applying a residual equilibrium concentration of 10 µg/L at the equilibrium pH value of 7.9 ± 0.1, with a contact time of 96 h (i.e., Q10), was 6.9 and 3.5 µg/mg for As(V) and As(III), respectively, whereas the measured adsorption capacity of the conventionally used Granular Ferric Hydroxide (GFH), under similar conditions, was found to be 2.1 and 1.4 µg/mg for As(V) and As(III), respectively. Furthermore, the adsorption of arsenic species onto DFH in a Hamburg tap water matrix, as well as in an NSF challenge water matrix, was found to be significantly lower. The lowest recorded adsorption capacity at the same equilibrium concentration was 3.2 µg As(V)/mg and 1.1 µg As(III)/mg for the NSF water. Batch adsorption kinetics experiments were also conducted to study the impact of a water matrix on the behavior of removal kinetics for As(V) and As(III) species by DFH, and the respective data were best fitted to the second order kinetic model. The outcomes of this study confirm that the small sized iron oxide-based material, being a by-product of the production process of GFH adsorbent, has significant potential to be used for the adsorptive removal of arsenic species from water, especially when this material can be combined with the subsequent application of low-pressure membrane filtration/separation in a hybrid water treatment process.
Muhammad Usman; Ioannis Katsoyiannis; Manassis Mitrakas; Anastasios Zouboulis; Mathias Ernst. Performance Evaluation of Small Sized Powdered Ferric Hydroxide as Arsenic Adsorbent. Water 2018, 10, 957 .
AMA StyleMuhammad Usman, Ioannis Katsoyiannis, Manassis Mitrakas, Anastasios Zouboulis, Mathias Ernst. Performance Evaluation of Small Sized Powdered Ferric Hydroxide as Arsenic Adsorbent. Water. 2018; 10 (7):957.
Chicago/Turabian StyleMuhammad Usman; Ioannis Katsoyiannis; Manassis Mitrakas; Anastasios Zouboulis; Mathias Ernst. 2018. "Performance Evaluation of Small Sized Powdered Ferric Hydroxide as Arsenic Adsorbent." Water 10, no. 7: 957.
Glyphosate is a synthesis product and chemical substance that entered in the global market during the 70s. In the beginning, the molecule was used as an active principle in a wide range of herbicides, with great success. This was mainly due to its systemic and non-selective action against vegetable organisms and also to the spread of Genetically Modified Organism (GMO) crops, which over the years were specifically created with a resistance to glyphosate. To date, the product is, for these reasons, the most sprayed and most used herbicide in the world. Because of its widespread diffusion into the environment, it was not long before glyphosate found itself at the center of an important scientific debate about its adverse effects on health and environment. In fact, in 2015 the IARC (International Agency for Research on Cancer, Lyon, France), an organization referred to as the specialized cancer agency of the World Health Organization (WHO, Geneva, Switzerland), classified the substance as “likely carcinogenic” to humans. This triggered an immediate and negative reaction from the producer, who accused the Agency and claimed that they had failed to carry out their studies properly and that these conclusions were largely contradictory to published research. Additionally, in 2015, just a few months after the IARC monography published on glyphosate, the EFSA (European Food Safety Authority, Parma, Italy), another WHO related organization, declared that it was “unlikely” that the molecule could be carcinogenic to humans or that it could cause any type of risk to human health. The conflict between the two organizations of the World Health Organization triggered many doubts, and for this reason, a series of independent studies were launched to better understand what glyphosate’s danger to humans and the environment really was. The results have brought to light how massive use of the herbicide has created over time a real global contamination that has not only affected the soil, surface and groundwater as well as the atmosphere, but even food and commonly used objects, such as diapers, medical gauze, and absorbent for female intimate hygiene. How human health is compromised as a result of glyphosate exposure is a topic that is still very debatable and still unclear and unambiguous. This paper is a review of the results of the main independent recent scientific studies.
Vincenzo Torretta; Ioannis Katsoyiannis; Paolo Viotti; Elena Rada. Critical Review of the Effects of Glyphosate Exposure to the Environment and Humans through the Food Supply Chain. Sustainability 2018, 10, 950 .
AMA StyleVincenzo Torretta, Ioannis Katsoyiannis, Paolo Viotti, Elena Rada. Critical Review of the Effects of Glyphosate Exposure to the Environment and Humans through the Food Supply Chain. Sustainability. 2018; 10 (4):950.
Chicago/Turabian StyleVincenzo Torretta; Ioannis Katsoyiannis; Paolo Viotti; Elena Rada. 2018. "Critical Review of the Effects of Glyphosate Exposure to the Environment and Humans through the Food Supply Chain." Sustainability 10, no. 4: 950.
Ioannis A. Katsoyiannis; Dimitra Voutsa. Sustainable environmental chemistry and technology with focus on the Mediterranean area. Environmental Science and Pollution Research 2018, 25, 12189 -12190.
AMA StyleIoannis A. Katsoyiannis, Dimitra Voutsa. Sustainable environmental chemistry and technology with focus on the Mediterranean area. Environmental Science and Pollution Research. 2018; 25 (13):12189-12190.
Chicago/Turabian StyleIoannis A. Katsoyiannis; Dimitra Voutsa. 2018. "Sustainable environmental chemistry and technology with focus on the Mediterranean area." Environmental Science and Pollution Research 25, no. 13: 12189-12190.
The safety of high quality drinking water supply relies on the quantities to be delivered, on the complexity of the water supply systems, and on the widespread phenomena of the contamination of water bodies. These parameters indicate the need for the development of an application that will allow the quick acquisition of data on strategic management. This is requires both the analysis of factors related to the hydraulic operation of the plants and the characteristics of water quality. The present paper aims to evaluate the use of models that predict data for water quality in a distribution system. The assessment is made in order to consider the use of the model as a support tool for the management system of a supply network and to optimize the quality of the provided service. The improvement of the control system related to the operations of disinfection, in particular, in the case of long pipelines, is absolutely mandatory in order to ensure the safety of public health and respect for the environment at high levels.
Vincenzo Torretta; Athanasia K. Tolkou; Ioannis A. Katsoyiannis; Athanasios Katsoyiannis; Ettore Trulli; Elena Magaril; Elena Cristina Rada. Consumption of Free Chlorine in an Aqueduct Scheme with Low Protection: Case Study of the New Aqueduct Simbrivio-Castelli (NASC), Italy. Water 2018, 10, 127 .
AMA StyleVincenzo Torretta, Athanasia K. Tolkou, Ioannis A. Katsoyiannis, Athanasios Katsoyiannis, Ettore Trulli, Elena Magaril, Elena Cristina Rada. Consumption of Free Chlorine in an Aqueduct Scheme with Low Protection: Case Study of the New Aqueduct Simbrivio-Castelli (NASC), Italy. Water. 2018; 10 (2):127.
Chicago/Turabian StyleVincenzo Torretta; Athanasia K. Tolkou; Ioannis A. Katsoyiannis; Athanasios Katsoyiannis; Ettore Trulli; Elena Magaril; Elena Cristina Rada. 2018. "Consumption of Free Chlorine in an Aqueduct Scheme with Low Protection: Case Study of the New Aqueduct Simbrivio-Castelli (NASC), Italy." Water 10, no. 2: 127.
The presence of arsenic in water supplies is a major problem for public health and still concerns large parts of population in Southeast Asia, Latin America and Europe. Removal of arsenic is usually accomplished either by coagulation with iron salts or by adsorption with iron oxides or activated alumina. However, these materials, although very efficient for arsenic, normally do not remove other undesirable constituents from waters, such as chlorine and organo-chlorine compounds, which are the results of water chlorination. Activated carbon has this affinity for organic compounds, but does not remove arsenic efficiently. Therefore, in the present study, iron modified activated carbons are investigated as alternative sorbents for the removal of arsenic(V) from aqueous solutions. In addition, modified activated carbons with magnetic properties can easily be separated from the solutions. In the present study, a simple and efficient method was used for the preparation of magnetic Fe3(Mn2+)O4 (M:Fe and/or Mn) activated carbons. Activated carbons were impregnated with magnetic precursor solutions and then calcinated at 400 °C. The obtained carbons were characterized by X-ray diffraction (XRD), nitrogen adsorption isotherms, scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), Fourier Transform Infrared Spectrometry (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements. Their adsorption performance for As(V) was evaluated. The iron impregnation presented an increase in As(V) maximum adsorption capacity (Qmax) from about 4 mg g−1 for the raw carbon to 11.05 mg g−1, while Mn incorporation further increased the adsorption capacity at 19.35 mg g−1.
George P. Gallios; Athanasia K. Tolkou; Ioannis A. Katsoyiannis; Katarina Stefusova; Miroslava Vaclavikova; Eleni A. Deliyanni. Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides. Sustainability 2017, 9, 1684 .
AMA StyleGeorge P. Gallios, Athanasia K. Tolkou, Ioannis A. Katsoyiannis, Katarina Stefusova, Miroslava Vaclavikova, Eleni A. Deliyanni. Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides. Sustainability. 2017; 9 (10):1684.
Chicago/Turabian StyleGeorge P. Gallios; Athanasia K. Tolkou; Ioannis A. Katsoyiannis; Katarina Stefusova; Miroslava Vaclavikova; Eleni A. Deliyanni. 2017. "Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides." Sustainability 9, no. 10: 1684.
Water scarcity and water pollution is a worldwide problem and has driven research into eco-friendly and low-energy cost efficient remediation. The reuse of wastewater for non-potable purpose after proper treatment is the only sustainable solution to the problem. Advanced oxidation processes (AOP) based on the in-situ generation of hydroxyl radicals have been intensively investigated for this purpose as a treatment step to achieve wastewater reuse. The main degradation mechanism of AOPs is based on the reaction of hydroxyl radicals with dissolved organic matter. However, hydroxyl radicals follow unselective multi-step pathways, limiting their efficiency in complex environmental matrices. To overcome such limitations, AOP treatment, based on generation of sulfate radicals, has been developed and widely investigated. This current mini-review will cover the most recent developments regarding emerging contaminant removal, i.e., organic micropollutants, using sulfate radicals generated by active persulfate or peroxymonosulfate, with a focus on an application to wastewater effluents for possible wastewater reuse.
Monica Brienza; Ioannis A. Katsoyiannis. Sulfate Radical Technologies as Tertiary Treatment for the Removal of Emerging Contaminants from Wastewater. Sustainability 2017, 9, 1604 .
AMA StyleMonica Brienza, Ioannis A. Katsoyiannis. Sulfate Radical Technologies as Tertiary Treatment for the Removal of Emerging Contaminants from Wastewater. Sustainability. 2017; 9 (9):1604.
Chicago/Turabian StyleMonica Brienza; Ioannis A. Katsoyiannis. 2017. "Sulfate Radical Technologies as Tertiary Treatment for the Removal of Emerging Contaminants from Wastewater." Sustainability 9, no. 9: 1604.
Chromium (Cr(VI)) is a very toxic and carcinogenic element, which is widely present in groundwaters, mainly due to geogenic conditions. The limit of Cr(VI) in drinking water is expected to be reduced to 10 μg/L in both the USA and the European Union. Recent literature findings indicated that the most efficient process in reducing Cr(VI) levels to below 10 μg/L proved to be Cr(VI) reduction by Fe(II), by applying a molar ratio Fe(II)/Cr(VI) of around 9. In the present work, we investigated the reduction of Cr(VI) by Fe(II) in pipe flocculation reactors followed by filtration of insoluble products by microfiltration. The proposed technology involves re-circulation of a part of the sludge in the pipe reactors, in order to improve kinetics and efficiency of the process. The obtained results showed that with a Fe(II) dose of around 1 mg/L, Cr(VI) was reduced to below 10 μg/L, by even an initial concentration as high as 300 μg/L of Cr(VI), corresponding to a molar ratio Fe(II)/Cr(VI) of around 3, thus reducing the overall quantity of reductive reagents and of the produced sludge. This ratio was also confirmed by the XPS analysis, which also showed that Cr(VI) was reduced to Cr(III) and then precipitated either as Cr(OH)3 or associated with the produced iron oxides.
Stylianos Stylianou; Konstantinos Simeonidis; Manassis Mitrakas; Anastasios Zouboulis; Mathias Ernst; Ioannis A. Katsoyiannis. Reductive precipitation and removal of Cr(VI) from groundwaters by pipe flocculation-microfiltration. Environmental Science and Pollution Research 2017, 25, 12256 -12262.
AMA StyleStylianos Stylianou, Konstantinos Simeonidis, Manassis Mitrakas, Anastasios Zouboulis, Mathias Ernst, Ioannis A. Katsoyiannis. Reductive precipitation and removal of Cr(VI) from groundwaters by pipe flocculation-microfiltration. Environmental Science and Pollution Research. 2017; 25 (13):12256-12262.
Chicago/Turabian StyleStylianos Stylianou; Konstantinos Simeonidis; Manassis Mitrakas; Anastasios Zouboulis; Mathias Ernst; Ioannis A. Katsoyiannis. 2017. "Reductive precipitation and removal of Cr(VI) from groundwaters by pipe flocculation-microfiltration." Environmental Science and Pollution Research 25, no. 13: 12256-12262.