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Ammonia accumulation in biogas plants reactors is becoming more frequently encountered, resulting in reduced methane (CH4) production. Ammonia toxicity occurs when N-rich substrates represent a significant part of the biogas plant’s feedstock. The aim of this study was to develop an estimation method for the effect of ammonia toxicity on the CH4 production of biogas plants. Two periods where a biogas plant operated at 3200 mg·L−1 (1st period) and 4400 mg·L−1 (2nd period) of ammonium nitrogen (NH4+–N) were examined. Biomethane potentials (BMPs) of the individual substrates collected during these periods and of the mixture of substrates with the weight ratio used by the biogas plant under different ammonia levels (2000–5200 mg·L−1 NH4+–N) were determined. CH4 production calculated from the substrates’ BMPs and the quantities used of each substrate by the biogas plant was compared with actual CH4 production on-site. Biogas plant’s CH4 production was 9.9% lower in the 1st and 20.3% in the 2nd period in comparison with the BMP calculated CH4 production, of which 3% and 14% was due to ammonia toxicity, respectively. BMPs of the mixtures showed that the actual CH4 reduction rate of the biogas plant could be approximately estimated by the ammonia concentrations levels.
Sotirios D. Kalamaras; Georgios Vitoulis; Maria Lida Christou; Themistoklis Sfetsas; Spiridon Tziakas; Vassilios Fragos; Petros Samaras; Thomas A. Kotsopoulos. The Effect of Ammonia Toxicity on Methane Production of a Full-Scale Biogas Plant—An Estimation Method. Energies 2021, 14, 5031 .
AMA StyleSotirios D. Kalamaras, Georgios Vitoulis, Maria Lida Christou, Themistoklis Sfetsas, Spiridon Tziakas, Vassilios Fragos, Petros Samaras, Thomas A. Kotsopoulos. The Effect of Ammonia Toxicity on Methane Production of a Full-Scale Biogas Plant—An Estimation Method. Energies. 2021; 14 (16):5031.
Chicago/Turabian StyleSotirios D. Kalamaras; Georgios Vitoulis; Maria Lida Christou; Themistoklis Sfetsas; Spiridon Tziakas; Vassilios Fragos; Petros Samaras; Thomas A. Kotsopoulos. 2021. "The Effect of Ammonia Toxicity on Methane Production of a Full-Scale Biogas Plant—An Estimation Method." Energies 14, no. 16: 5031.
A promising solution for membrane fouling reduction in membrane bioreactors (MBRs) could be the adjustment of operating parameters of the MBR, such as hydraulic retention time (HRT), food/microorganisms (F/M) loading and dissolved oxygen (DO) concentration, aiming to modify the sludge morphology to the direction of improvement of the membrane filtration. In this work, these parameters were investigated in a step-aerating pilot MBR that treated municipal wastewater, in order to control the filamentous population. When F/M loading in the first aeration tank (AT1) was ≤0.65 ± 0.2 g COD/g MLSS/d at 20 ± 3 °C, DO = 2.5 ± 0.1 mg/L and HRT = 1.6 h, the filamentous bacteria were controlled effectively at a moderate filament index of 1.5–3. The moderate population of filamentous bacteria improved the membrane performance, leading to low transmembrane pressure (TMP) at values ≤ 2 kPa for a great period, while at the control MBR the TMP gradually increased reaching 14 kPa. Soluble microbial products (SMP), were also maintained at low concentrations, contributing additionally to the reduction of ΤΜP. Finally, the step-aerating MBR process and the selected imposed operating conditions of HRT, F/M and DO improved the MBR performance in terms of fouling control, facilitating its future wider application.
Dimitra Banti; Manassis Mitrakas; Petros Samaras. Membrane Fouling Controlled by Adjustment of Biological Treatment Parameters in Step-Aerating MBR. Membranes 2021, 11, 553 .
AMA StyleDimitra Banti, Manassis Mitrakas, Petros Samaras. Membrane Fouling Controlled by Adjustment of Biological Treatment Parameters in Step-Aerating MBR. Membranes. 2021; 11 (8):553.
Chicago/Turabian StyleDimitra Banti; Manassis Mitrakas; Petros Samaras. 2021. "Membrane Fouling Controlled by Adjustment of Biological Treatment Parameters in Step-Aerating MBR." Membranes 11, no. 8: 553.
Clean water is an essential source of life, and its demand is continuously increasing with the rapid growth in population, while the freshwater reserves are also depleting. A large amount of wastewater is released by different industries, which is affecting the environment as well as polluting the freshwater reserves. Recycling and treatment of wastewater are highly essential to meet the demand for clean water and to protect the environment. Activated carbon can be used in primary, secondary and tertiary wastewater treatment steps. It can be used to capture pollutants which stop microbial activity or to produce clean water with high purity. About 3 million tons of activated carbon are produced per year and it is mainly used for fluid purification. The objective of this review is to investigate the preparation and production of biochar from lignin which is an important resource available in great quantities (about 100 Million tons per year) and the practical application of it for wastewater treatment. Biochar can be produced through pyrolysis (at temperatures of 600-700°C) and Hydrothermal carbonization (at temperature between 180-300°C). Subsequent activation can be performed in two ways (physical and chemical) usually at temperatures between 600-800°C. The quality of biochar and activated carbon produced from lignin-rich residue can be very high, even though the costs also are higher respect to other fossil derived materials (carbon black, lignite and pet coke).
Eid Gul; Khalideh Al Bkoor Alrawashdeh; Ondrej Masek; Øyvind Skreiberg; Andrea Corona; Mauro Zampilli; Liang Wang; Petros Samaras; Qing Yang; Hewen Zhou; Pietro Bartocci; Francesco Fantozzi. Production and use of biochar from lignin and lignin-rich residues (such as digestate and olive stones) for wastewater treatment. Journal of Analytical and Applied Pyrolysis 2021, 158, 105263 .
AMA StyleEid Gul, Khalideh Al Bkoor Alrawashdeh, Ondrej Masek, Øyvind Skreiberg, Andrea Corona, Mauro Zampilli, Liang Wang, Petros Samaras, Qing Yang, Hewen Zhou, Pietro Bartocci, Francesco Fantozzi. Production and use of biochar from lignin and lignin-rich residues (such as digestate and olive stones) for wastewater treatment. Journal of Analytical and Applied Pyrolysis. 2021; 158 ():105263.
Chicago/Turabian StyleEid Gul; Khalideh Al Bkoor Alrawashdeh; Ondrej Masek; Øyvind Skreiberg; Andrea Corona; Mauro Zampilli; Liang Wang; Petros Samaras; Qing Yang; Hewen Zhou; Pietro Bartocci; Francesco Fantozzi. 2021. "Production and use of biochar from lignin and lignin-rich residues (such as digestate and olive stones) for wastewater treatment." Journal of Analytical and Applied Pyrolysis 158, no. : 105263.
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.
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 StylePetros 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 StylePetros 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.
Wastewater treatment plants have been traditionally developed for the aerobic degradation of effluent organic matter, and are associated with high energy consumption. The adoption of sustainable development targets favors the utilization of every available energy source, and the current work aims at the identification of biomethane potential from non-conventional sources derived from municipal wastewater treatment processes. Byproducts derived from the primary treatment process stage were collected from four sewage treatment plants in Greece with great variation in design capacity and servicing areas with wide human activities, affecting the quality of the influents and the corresponding primary wastes. The samples were characterized for the determination of their solids and fats content, as well as the concentration of leached organic matter and nutrients, and were subjected to anaerobic digestion treatment for the measurement of their biomethane production potential according to standardized procedures. All samples exhibited potential for biogas utilization, with screenings collected from a treatment plant receiving wastewater from an area with combined rural and agro-industrial activities presenting the highest potential. Nevertheless, these samples had a methanogens doubling time of around 1.3 days, while screenings from a high-capacity unit proved to have a methanogens doubling time of less than 1 day. On the other hand, floatings from grit chambers presented the smallest potential for energy utilization. Nevertheless, these wastes can be utilized for energy production, potentially in secondary sludge co-digestion units, converting a treatment plant from an energy demanding to a zero energy or even a power production process.
Eleni Tsiakiri; Aikaterini Mpougali; Ioannis Lemonidis; Christos Tzenos; Sotirios Kalamaras; Thomas Kotsopoulos; Petros Samaras. Estimation of Energy Recovery Potential from Primary Residues of Four Municipal Wastewater Treatment Plants. Sustainability 2021, 13, 7198 .
AMA StyleEleni Tsiakiri, Aikaterini Mpougali, Ioannis Lemonidis, Christos Tzenos, Sotirios Kalamaras, Thomas Kotsopoulos, Petros Samaras. Estimation of Energy Recovery Potential from Primary Residues of Four Municipal Wastewater Treatment Plants. Sustainability. 2021; 13 (13):7198.
Chicago/Turabian StyleEleni Tsiakiri; Aikaterini Mpougali; Ioannis Lemonidis; Christos Tzenos; Sotirios Kalamaras; Thomas Kotsopoulos; Petros Samaras. 2021. "Estimation of Energy Recovery Potential from Primary Residues of Four Municipal Wastewater Treatment Plants." Sustainability 13, no. 13: 7198.
Concrete sewer pipes can be deteriorated by sulfuric acid (H2SO4), which is created by the oxidation of hydrogen sulfide in the presence of certain bacteria inside the sewers. This process is called biocorrosion. In this paper, H2SO4 (i.e., chemical, non-biogenic) was used to study acid attack on concrete samples. The authors conducted experiments under different acid flows and concentrations, to account for the conditions prevailing in sewage networks exposed to flowing acidic waters. The effect of intermittent stormwater on the removal of protective layers was studied in addition to constant flow runs. Specimens’ erosion depth was measured with a Vernier micrometer. In addition, unconfined compression at an axial strain rate of 0.0016 mm/mm/min was used for the estimation of unconfined compressive strength and elastic modulus. Moreover, the formation of gypsum as a protective layer and its role in biocorrosion was discussed. From this study, it was concluded that although the utilization of constant flowrates of acidic waters represents an important indication of corrosion mechanism, intermittent sewage and water flows should be taken into account, corresponding to real conditions in sewage networks, and resulting into accelerated concrete corrosion. Stormwater in combined sewers could remove the protective gypsum layer, thus accelerating chemical corrosion; however, in the presence of biogenic H2SO4, the removal of gypsum by excess flows due to stormwater could have a positive effect on corrosion mitigation. Finally, for combined sewers, selected coatings should withstand the effect of stormwater and high-velocity water flow tests should be included in future studies.
Georgios Fytianos; Anastasios Tsikrikis; Costas A. Anagnostopoulos; Efthimios Papastergiadis; Petros Samaras. The Inclusion of Acidic and Stormwater Flows in Concrete Sewer Corrosion Mitigation Studies. Water 2021, 13, 261 .
AMA StyleGeorgios Fytianos, Anastasios Tsikrikis, Costas A. Anagnostopoulos, Efthimios Papastergiadis, Petros Samaras. The Inclusion of Acidic and Stormwater Flows in Concrete Sewer Corrosion Mitigation Studies. Water. 2021; 13 (3):261.
Chicago/Turabian StyleGeorgios Fytianos; Anastasios Tsikrikis; Costas A. Anagnostopoulos; Efthimios Papastergiadis; Petros Samaras. 2021. "The Inclusion of Acidic and Stormwater Flows in Concrete Sewer Corrosion Mitigation Studies." Water 13, no. 3: 261.
Membrane bioreactor (MBR) systems are connected to several advantages compared to the conventional activated sludge (CAS) units. This work aims to the examination of the life cycle environmental impact of an MBR against a CAS unit when treating municipal wastewater with similar influent loading (BOD = 400 mg/L) and giving similar high-quality effluent (BOD < 5 mg/L). The MBR unit contained a denitrification, an aeration and a membrane tank, whereas the CAS unit included an equalization, a denitrification, a nitrification, a sedimentation, a mixing, a flocculation tank and a drum filter. Several impact categories factors were calculated by implementing the Life Cycle Assessment (LCA) methodology, including acidification potential, eutrophication potential, global warming potential (GWP), ozone depletion potential and photochemical ozone creation potential of the plants throughout their life cycle. Real data from two wastewater treatment plants were used. The research focused on two parameters which constitute the main differences between the two treatment plants: The excess sludge removal life cycle contribution—where GWPMBR = 0.50 kg CO2-eq*FU−1 and GWPCAS = 2.67 kg CO2-eq*FU−1 without sludge removal—and the wastewater treatment plant life cycle contribution—where GWPMBR = 0.002 kg CO2-eq*FU−1 and GWPCAS = 0.14 kg CO2-eq*FU−1 without land area contribution. Finally, in all the examined cases the environmental superiority of the MBR process was found.
Dimitra C. Banti; Michail Tsangas; Petros Samaras; Antonis Zorpas. LCA of a Membrane Bioreactor Compared to Activated Sludge System for Municipal Wastewater Treatment. Membranes 2020, 10, 421 .
AMA StyleDimitra C. Banti, Michail Tsangas, Petros Samaras, Antonis Zorpas. LCA of a Membrane Bioreactor Compared to Activated Sludge System for Municipal Wastewater Treatment. Membranes. 2020; 10 (12):421.
Chicago/Turabian StyleDimitra C. Banti; Michail Tsangas; Petros Samaras; Antonis Zorpas. 2020. "LCA of a Membrane Bioreactor Compared to Activated Sludge System for Municipal Wastewater Treatment." Membranes 10, no. 12: 421.
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.
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 StyleDomna 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 StyleDomna 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.
Membrane fouling investigations in membrane bioreactors (MBRs) are a top research issue. The aim of this work is to study the combined effect of colloids and soluble microbial products (SMPs) on membrane fouling. Two lab-pilot MBRs were investigated for treating two types of wastewater (wwt), synthetic and domestic. Transmembrane pressure (TMP), SMP, particle size distribution and treatment efficiency were evaluated. Chemical Oxygen Demand (COD) removal and nitrification were successful for both kinds of sewage reaching up to 95–97% and 100%, respectively. Domestic wwt presented 5.5 times more SMP proteins and 11 times more SMP carbohydrates compared to the synthetic one. In contrast, synthetic wwt had around 20% more colloids in the mixed liquor with a size lower than membrane pore size (
Dimitra Banti; Manassis Mitrakas; Georgios Fytianos; Alexandra Tsali; Petros Samaras. Combined Effect of Colloids and SMP on Membrane Fouling in MBRs. Membranes 2020, 10, 118 .
AMA StyleDimitra Banti, Manassis Mitrakas, Georgios Fytianos, Alexandra Tsali, Petros Samaras. Combined Effect of Colloids and SMP on Membrane Fouling in MBRs. Membranes. 2020; 10 (6):118.
Chicago/Turabian StyleDimitra Banti; Manassis Mitrakas; Georgios Fytianos; Alexandra Tsali; Petros Samaras. 2020. "Combined Effect of Colloids and SMP on Membrane Fouling in MBRs." Membranes 10, no. 6: 118.
The changing role of the municipal water and wastewater authorities, together with the need for a sustainable maintenance treatment in the sewer systems, have been the catalysts for the integration of technical and financial information into asset management systems. This paper presents results from a cost-comparative analysis focusing on an annuities calculation for the evaluation of microbiologically induced corrosion (MIC) or biocorrosion mitigation methodologies used in the maintenance of concrete sewers. The replacement cost of deteriorated sewer concrete pipes is high, and MIC mitigation methods can be used to increase the current service life of concrete pipes. From the MIC mitigation methods that are frequently used, the authors examined those of flushing with high-pressure water (i.e., a common method used in Greece), and spraying with magnesium hydroxide slurry (MHS). The authors chose four different cities for the assessment, which presented different sewer characteristics and socioeconomic backgrounds. In addition, all methods for concrete sewer MIC mitigation were compared to the present value of replacement of sewer concrete pipes with new PVC ones. Results showed that flushing with high-pressure water is very cost demanding and should be avoided, while spraying with MHS could be a sustainable and economic solution in the long term.
Georgios Fytianos; Emmanouil Tziolas; Efthimios Papastergiadis; Petros Samaras. Least Cost Analysis for Biocorrosion Mitigation Strategies in Concrete Sewers. Sustainability 2020, 12, 4578 .
AMA StyleGeorgios Fytianos, Emmanouil Tziolas, Efthimios Papastergiadis, Petros Samaras. Least Cost Analysis for Biocorrosion Mitigation Strategies in Concrete Sewers. Sustainability. 2020; 12 (11):4578.
Chicago/Turabian StyleGeorgios Fytianos; Emmanouil Tziolas; Efthimios Papastergiadis; Petros Samaras. 2020. "Least Cost Analysis for Biocorrosion Mitigation Strategies in Concrete Sewers." Sustainability 12, no. 11: 4578.
This paper is intended to review the current practices and challenges regarding the corrosion of the Greek sewer systems with an emphasis on biocorrosion and to provide recommendations to avoid it. The authors followed a holistic approach, which included survey data obtained by local authorities serving more than 50% of the total country’s population and validated the survey answers with field measurements and analyses. The exact nature and extent of concrete biocorrosion problems in Greece are presented for the first time. Moreover, the overall condition of the sewer network, the maintenance frequency, and the corrosion prevention techniques used in Greece are also presented. Results from field measurements showed the existence of H2S in the gaseous phase (i.e., precursor of the H2SO4 formation in the sewer) and acidithiobacillus bacteria (i.e., biocorrosion causative agent) in the slime, which exists at the interlayer between the concrete wall and the sewage. Biocorrosion seems to mainly affect old concrete networks, and the replacement of the destroyed concrete pipes with new polyvinyl chloride (PVC) ones is currently common practice. However, in most cases, the replacement cost is high, and the authors provide some recommendations to increase the current service life of concrete pipes.
Georgios Fytianos; Vasilis Baltikas; Dimitrios Loukovitis; Dimitra Banti; Athanasios Sfikas; Efthimios Papastergiadis; Petros Samaras. Biocorrosion of Concrete Sewers in Greece: Current Practices and Challenges. Sustainability 2020, 12, 2638 .
AMA StyleGeorgios Fytianos, Vasilis Baltikas, Dimitrios Loukovitis, Dimitra Banti, Athanasios Sfikas, Efthimios Papastergiadis, Petros Samaras. Biocorrosion of Concrete Sewers in Greece: Current Practices and Challenges. Sustainability. 2020; 12 (7):2638.
Chicago/Turabian StyleGeorgios Fytianos; Vasilis Baltikas; Dimitrios Loukovitis; Dimitra Banti; Athanasios Sfikas; Efthimios Papastergiadis; Petros Samaras. 2020. "Biocorrosion of Concrete Sewers in Greece: Current Practices and Challenges." Sustainability 12, no. 7: 2638.
Wastewater treatment, as a crucial component of the urban water environment, consists of several energy-consumptive stages, therefore efficiency and energy savings measures are essential to maintain them as environmentally sustainable and economically viable. Operational and technical data from WWTPs in Greece have been collected as well as a sample from 61 facilities with key energy profile components. Energy consumption was assessed by specific key performance indicators (KPIs); specific energy consumption expressed per population equivalent (from 3 to 150 kWh/PE), per cubic meter treated (from 0.2 to 2.0 kWh/m3) and per unit of organic load removed (from 0.03 to 7.13 kWh/CODremoved).
Popi Christoforidou; George Bariamis; Maria Iosifidou; Eri Nikolaidou; Petros Samaras. Energy Benchmarking and Optimization of Wastewater Treatment Plants in Greece. Environmental Sciences Proceedings 2020, 2, 36 .
AMA StylePopi Christoforidou, George Bariamis, Maria Iosifidou, Eri Nikolaidou, Petros Samaras. Energy Benchmarking and Optimization of Wastewater Treatment Plants in Greece. Environmental Sciences Proceedings. 2020; 2 (1):36.
Chicago/Turabian StylePopi Christoforidou; George Bariamis; Maria Iosifidou; Eri Nikolaidou; Petros Samaras. 2020. "Energy Benchmarking and Optimization of Wastewater Treatment Plants in Greece." Environmental Sciences Proceedings 2, no. 1: 36.
Membrane fouling still remains a drawback for membrane bioreactors; there is nevertheless a natural promising solution which is the growth of filamentous microorganisms in moderate concentrations. In this project, an innovative 25 L membrane bioreactor is used, consisting of two aerated tanks and a membrane tank. The first tank is supplied with high Food/Microorganism (F/M) loading and the second tank with very low loading. The aerated tanks were constantly provided with dissolved oxygen (DO) 2.5 ± 0.5 mg/L. Finally, it is concluded that the imposed aeration conditions contribute to the growth and control of filaments in moderate concentrations having a filamentous index = 2 and therefore reducing membrane fouling for more than 1.5 months, maintaining the trans-membrane pressure at 1.4 ± 0.11 kPa.
Dimitra C. Banti; Alexandra Tsali; ManasiS Mitrakas; Petros Samaras. The Dissolved Oxygen Effect on the Controlled Growth of Filamentous Microorganisms in Membrane Bioreactors. Environmental Sciences Proceedings 2020, 2, 39 .
AMA StyleDimitra C. Banti, Alexandra Tsali, ManasiS Mitrakas, Petros Samaras. The Dissolved Oxygen Effect on the Controlled Growth of Filamentous Microorganisms in Membrane Bioreactors. Environmental Sciences Proceedings. 2020; 2 (1):39.
Chicago/Turabian StyleDimitra C. Banti; Alexandra Tsali; ManasiS Mitrakas; Petros Samaras. 2020. "The Dissolved Oxygen Effect on the Controlled Growth of Filamentous Microorganisms in Membrane Bioreactors." Environmental Sciences Proceedings 2, no. 1: 39.
Membrane biofouling, due to Soluble Microbial Products (SMP) and Extracellular Polymeric Substances (EPS) deposition, results in reduction of the performance of Membrane Bioreactors (MBRs). However, recently, a new method of biofouling control has been developed, utilizing the interference of the bacterial inter- and intra-species’ communication. Bacteria use Quorum Sensing (QS) to regulate the production of SMP and EPS. Therefore, disruption of Quorum Sensing (Quorum Quenching: QQ), by enzymes or microorganisms, may be a simple mean to control membrane biofouling. In the present study, a novel QQ-bacterium, namely Lactobacillus sp. SBR04MA, was isolated from municipal wastewater sludge and its ability to mitigate biofouling was evaluated by monitoring the changes in critical flux and transmembrane pressure, along with the production of EPS and SMP, in a lab-scale MBR system treating synthetic wastewater. Lactobacillus sp. SBR04MA showed great potential for biofouling control, which was evidenced by the ∼3-fold increase in critical flux (8.3 → 24.25 L/m2/h), as well as by reduction of the SMP and EPS production, which was lower during the QQ-period when compared against the control period. Furthermore, the addition of the QQ-strain did not affect the COD removal rate. Results suggested that Lactobacillus sp. SBR04MA represents a novel and promising strain for biofouling mitigation and enhancement of MBRs performance.
Ioannis D. Kampouris; Panayotis D. Karayannakidis; Dimitra C. Banti; Dimitra Sakoula; Dimitris Konstantinidis; Minas Yiangou; Petros E. Samaras. Evaluation of a novel quorum quenching strain for MBR biofouling mitigation. Water Research 2018, 143, 56 -65.
AMA StyleIoannis D. Kampouris, Panayotis D. Karayannakidis, Dimitra C. Banti, Dimitra Sakoula, Dimitris Konstantinidis, Minas Yiangou, Petros E. Samaras. Evaluation of a novel quorum quenching strain for MBR biofouling mitigation. Water Research. 2018; 143 ():56-65.
Chicago/Turabian StyleIoannis D. Kampouris; Panayotis D. Karayannakidis; Dimitra C. Banti; Dimitra Sakoula; Dimitris Konstantinidis; Minas Yiangou; Petros E. Samaras. 2018. "Evaluation of a novel quorum quenching strain for MBR biofouling mitigation." Water Research 143, no. : 56-65.
Dimitra Banti; Petros Samaras; Costas Tsioptsias; Anastasios Zouboulis; Manassis Mitrakas. Mechanism of SMP aggregation within the pores of hydrophilic and hydrophobic MBR membranes and aggregates detachment. Separation and Purification Technology 2018, 202, 119 -129.
AMA StyleDimitra Banti, Petros Samaras, Costas Tsioptsias, Anastasios Zouboulis, Manassis Mitrakas. Mechanism of SMP aggregation within the pores of hydrophilic and hydrophobic MBR membranes and aggregates detachment. Separation and Purification Technology. 2018; 202 ():119-129.
Chicago/Turabian StyleDimitra Banti; Petros Samaras; Costas Tsioptsias; Anastasios Zouboulis; Manassis Mitrakas. 2018. "Mechanism of SMP aggregation within the pores of hydrophilic and hydrophobic MBR membranes and aggregates detachment." Separation and Purification Technology 202, no. : 119-129.
Coupling of anaerobic ammonium oxidation (Anammox) with denitrifying anaerobic methane oxidation (DAMO) is a sustainable pathway for nitrogen removal and reducing methane emissions from wastewater treatment processes. However, studies on the competitive relation between Anammox bacteria and DAMO bacteria are limited. Here, we investigated the effects of variations in the contents of trace element iron on Anammox and DAMO microorganisms. The short-term results indicated that optimal concentrations of iron, which obviously stimulated the activity of Amammox bacteria, DAMO bacteria and DAMO archaea, were 80, 20, and 80 μM, respectively. The activity of Amammox bacteria increased more significant than DAMO bacteria with increasing contents of trace element iron. After long-term incubation with high content of trace element iron of 160 μM in the medium, Candidatus Brocadia (Amammox bacteria) outcompeted Candidatus Methylomirabilis oxyfera (DAMO bacteria), and ANME-2d (DAMO archaea) remarkably increased in number and dominated the co-culture systems (64.5%). Meanwhile, with further addition of iron, the removal rate of ammonium and nitrate increased by 13.6 and 9.2 times, respectively, when compared with that noted in the control. As far as we know, this study is the first to explore the important role of trace element iron contents in the competition between Anammox bacteria and DAMO bacteria and further enrichment of DAMO archaea by regulating the contents of trace element iron.
Yong-Ze Lu; Liang Fu; Na Li; Jing Ding; Ya-Nan Bai; Petros Samaras; Raymond Jianxiong Zeng. The content of trace element iron is a key factor for competition between anaerobic ammonium oxidation and methane-dependent denitrification processes. Chemosphere 2018, 198, 370 -376.
AMA StyleYong-Ze Lu, Liang Fu, Na Li, Jing Ding, Ya-Nan Bai, Petros Samaras, Raymond Jianxiong Zeng. The content of trace element iron is a key factor for competition between anaerobic ammonium oxidation and methane-dependent denitrification processes. Chemosphere. 2018; 198 ():370-376.
Chicago/Turabian StyleYong-Ze Lu; Liang Fu; Na Li; Jing Ding; Ya-Nan Bai; Petros Samaras; Raymond Jianxiong Zeng. 2018. "The content of trace element iron is a key factor for competition between anaerobic ammonium oxidation and methane-dependent denitrification processes." Chemosphere 198, no. : 370-376.
Apostolos N. Baklavaridis; Petros E. Samaras; Vayos G. Karayannis. Recent progress in the advanced oxidation of wastewaters using recycled fly ashes as alternative catalytic agents. Desalination and Water Treatment 2018, 133, 392 -306.
AMA StyleApostolos N. Baklavaridis, Petros E. Samaras, Vayos G. Karayannis. Recent progress in the advanced oxidation of wastewaters using recycled fly ashes as alternative catalytic agents. Desalination and Water Treatment. 2018; 133 ():392-306.
Chicago/Turabian StyleApostolos N. Baklavaridis; Petros E. Samaras; Vayos G. Karayannis. 2018. "Recent progress in the advanced oxidation of wastewaters using recycled fly ashes as alternative catalytic agents." Desalination and Water Treatment 133, no. : 392-306.
Dimitra Banti; Panayotis D. Karayannakidis; Petros Samaras; Manassis G. Mitrakas. An innovative bioreactor set-up that reduces membrane fouling by adjusting the filamentous bacterial population. Journal of Membrane Science 2017, 542, 430 -438.
AMA StyleDimitra Banti, Panayotis D. Karayannakidis, Petros Samaras, Manassis G. Mitrakas. An innovative bioreactor set-up that reduces membrane fouling by adjusting the filamentous bacterial population. Journal of Membrane Science. 2017; 542 ():430-438.
Chicago/Turabian StyleDimitra Banti; Panayotis D. Karayannakidis; Petros Samaras; Manassis G. Mitrakas. 2017. "An innovative bioreactor set-up that reduces membrane fouling by adjusting the filamentous bacterial population." Journal of Membrane Science 542, no. : 430-438.
Petros Samaras; Chrysi A. Papadimitriou; Anastasios I. Zouboulis; Minas Yiangou; George P. Sakellaropoulos. ROLE OF EXTRACELLULAR POLYMERIC SUBSTANCES ON TWO BIOLOGICAL REACTORS PERFORMANCE TREATING PHENOL. Environmental Engineering and Management Journal 2017, 16, 1843 -1852.
AMA StylePetros Samaras, Chrysi A. Papadimitriou, Anastasios I. Zouboulis, Minas Yiangou, George P. Sakellaropoulos. ROLE OF EXTRACELLULAR POLYMERIC SUBSTANCES ON TWO BIOLOGICAL REACTORS PERFORMANCE TREATING PHENOL. Environmental Engineering and Management Journal. 2017; 16 (9):1843-1852.
Chicago/Turabian StylePetros Samaras; Chrysi A. Papadimitriou; Anastasios I. Zouboulis; Minas Yiangou; George P. Sakellaropoulos. 2017. "ROLE OF EXTRACELLULAR POLYMERIC SUBSTANCES ON TWO BIOLOGICAL REACTORS PERFORMANCE TREATING PHENOL." Environmental Engineering and Management Journal 16, no. 9: 1843-1852.
The treatment of molasses wastewater, by a combined microalgae-activated sludge process, for the simultaneous organics and total nitrogen reduction, was examined. Further enhancement of the performance of the combined process was accomplished, by means of biofilm carriers or electrocoagulation. A LED light tube was immersed into the reactor tank aiming to enhance the growth of photosynthetic microalgae, while in a similar unit, biofilm carriers were added to the system, representing a moving bed bioreactor. Exposure of the activated sludge biocommunity to light source, resulted in the growth of microalgae and photoreactors exhibited higher removal rates of total nitrogen and nitrates. However, operation at longer times resulted in low effluent quality due to the presence of microalgae cells as a result of high growth rates, and potential light shading effect. Nevertheless, the moving bed system was more beneficial than the single photoreactor, as biofilm carriers provided a self cleaning capacity of the light source, reducing the effect of microalgae deposition. Advanced treatment of the biological effluents, by electrocoagulation, increased even more the process efficiency: the combined photobioreactor and electrocoagulation process resulted in about 78% COD removal and more than 35% total nitrogen removal in the effluent, where nitrates represented almost the single form of total nitrogen.
Costas Tsioptsias; Gesthimani Lionta; Andreas Deligiannis; Petros Samaras. Enhancement of the performance of a combined microalgae-activated sludge system for the treatment of high strength molasses wastewater. Journal of Environmental Management 2016, 183, 126 -132.
AMA StyleCostas Tsioptsias, Gesthimani Lionta, Andreas Deligiannis, Petros Samaras. Enhancement of the performance of a combined microalgae-activated sludge system for the treatment of high strength molasses wastewater. Journal of Environmental Management. 2016; 183 ():126-132.
Chicago/Turabian StyleCostas Tsioptsias; Gesthimani Lionta; Andreas Deligiannis; Petros Samaras. 2016. "Enhancement of the performance of a combined microalgae-activated sludge system for the treatment of high strength molasses wastewater." Journal of Environmental Management 183, no. : 126-132.