The Experts below are selected from a list of 11571 Experts worldwide ranked by ideXlab platform
Marcelo Zaiat - One of the best experts on this subject based on the ideXlab platform.
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An upflow fixed-bed anAerobic–Aerobic Reactor for removal of organic matter and nitrogen from L-lysine plant wastewater
Journal of Environmental Engineering and Science, 2013Co-Authors: Moacir Messias De Araújo, Marcelo ZaiatAbstract:This paper reports on the design of a new Reactor configuration—an upflow fixed-bed combined anAerobic – Aerobic Reactor — can operate as a single treatment unit for the removal of nitrogen (≈150 mg N/L) and organic matter (≈1300 mg COD/L) from Lysine plant wastewater. L-Lysine, an essential amino acid for animal nutrition, is produced by fermentation from natural raw materials of agricultural origin, thus generating wastewater with high contents of organic matter and nitrogen. The best operational condition of the Reactor was obtained with a hydraulic retention time of 35 h (21 h in the anAerobic zone and 14 h in the Aerobic zone) and a recycling ratio (R) of 3·5. In this condition, the COD, total Kjeldahl nitrogen (TKN), and total nitrogen (TN) removal efficiencies were 97%, 96%, and 77%, respectively, with average effluent concentrations of 10 ± 36 mg COD/L, 2 ± 1 mg NH4+-N/L, 8 ± 3 mg Org-N/L, 1 ± 1 mg NH2−-N/L, and 26 ± 23 mg NH3−-N/L.
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Reduction of sludge generation by the addition of support material in a cyclic activated sludge system for municipal wastewater treatment.
Bioresource technology, 2013Co-Authors: Moacir Messias De Araujo Junior, André Lermontov, Philippe Lopes Da Silva Araujo, Marcelo ZaiatAbstract:Abstract An innovative biomass carrier (Biobob®) was tested for municipal wastewater treatment in an activated sludge system to evaluate the pollutant removal performance and the sludge generation for different carrier volumes. The experiment was carried out in a pilot-scale cyclic activated sludge system (CASS®) built with three cylindrical tanks in a series: an anoxic selector (2.1 m 3 ), an Aerobic selector (2.5 m 3 ) and the main Aerobic Reactor (25.1 m 3 ). The results showed that by adding the Biobob® carrier decreased the MLVSS concentration, which consequently reduced the waste sludge production of the system. Having 7% and 18% (v/v) support material in the Aerobic Reactor, the observed biomass yield decreased 18% and 36%, respectively, relative to the Reactor operated with suspended biomass. The addition of media did not affect the system’s performance for COD and TSS removal. However, TKN and TN removal were improved by 24% and 14%, respectively, using 18% (v/v) carrier.
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An upflow fixed-bed anAerobic–Aerobic Reactor for removal of organic matter and nitrogen from L-lysine plant wastewaterA paper submitted to the Journal of Environmental Engineering and Science.
Canadian Journal of Civil Engineering, 2009Co-Authors: Moacir Messias De Araújom. Messias Dearaújo, Marcelo ZaiatAbstract:This paper reports on the design of a new Reactor configuration — an upflow fixed-bed combined anAerobic–Aerobic Reactor — can operate as a single treatment unit for the removal of nitrogen (≈150 m...
Wen Qin - One of the best experts on this subject based on the ideXlab platform.
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Microbial community composition and function in a pilot-scale anAerobic-anoxic-Aerobic combined process for the treatment of traditional Chinese medicine wastewater.
Bioresource technology, 2017Co-Authors: Liqiang Meng, Wen QinAbstract:Abstract Biodegradation of traditional Chinese medicine (TCM) wastewater was investigated in a pilot-scale anAerobic-anoxic-Aerobic combined process, which was composed of an expanded granular sludge blanket (EGSB) Reactor, a hydrolysis acidification (HA) Reactor and a biological contact oxidation (BCO) Reactor. In stable stage, the average values of COD and color in the combined process effluent were 45.7 mg L−1 and 13 times, respectively. Excellent linear relations (R2 > 0.915) were achieved between color and UV254 at three color levels. Comprehensive community structures of the combined process were analysed by Illumina MiSeq Sequencing, which revealed that microbial community in the Aerobic Reactor had the greatest diversity and richness. Bacteroidetes, Firmicutes and Proteobacteria were dominant phyla in the three Reactors, and Bacteroidales, Geobacter, ZB2 were the predominant functional microorganisms in the anAerobic, anoxic and Aerobic Reactors, respectively. Good removal efficiencies and presence of core microorganisms confirmed that the combined process was feasible for treating TCM wastewater.
O.j. Skjelhaugen - One of the best experts on this subject based on the ideXlab platform.
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Thermophilic Aerobic Reactor for processing organic liquid wastes
Water Research, 1999Co-Authors: O.j. SkjelhaugenAbstract:Abstract Since 1990 the Agricultural University of Norway and Alfa Laval Agri Ltd have developed a small scale thermophilic Aerobic Reactor for processing liquid organic wastes and turning them into a stable and hygienic product. The Reactor has proven to be a multipurpose Reactor, that can process a wide range of organic substrates with VS-contents from about 1.5–9%. It is a prefabricated, compact and self contained unit with all parts mutually adapted to each other, and suitable for local operation. A control system runs the process based on given set values to predict the product quality. The most unique results obtained are high oxygen utilisation, low air flow, no ammonia loss and very low odour release. The Reactor causes no atmospheric pollution. The degradation of organic matter is moderate, and the processed substrate has the highest possible agronomic value. The hygienic quality of the product satisfies the criteria set by the Norwegian authorities. The stability of the product proved to be sufficient for a storage period of 10 months. By controlling the process carefully, same results are obtained in this one-stage Reactor as in two-stage Reactors. Use of one-stage instead of two-stage Reactor means reduced investments and simplified operation.
Liqiang Meng - One of the best experts on this subject based on the ideXlab platform.
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Microbial community composition and function in a pilot-scale anAerobic-anoxic-Aerobic combined process for the treatment of traditional Chinese medicine wastewater.
Bioresource technology, 2017Co-Authors: Liqiang Meng, Wen QinAbstract:Abstract Biodegradation of traditional Chinese medicine (TCM) wastewater was investigated in a pilot-scale anAerobic-anoxic-Aerobic combined process, which was composed of an expanded granular sludge blanket (EGSB) Reactor, a hydrolysis acidification (HA) Reactor and a biological contact oxidation (BCO) Reactor. In stable stage, the average values of COD and color in the combined process effluent were 45.7 mg L−1 and 13 times, respectively. Excellent linear relations (R2 > 0.915) were achieved between color and UV254 at three color levels. Comprehensive community structures of the combined process were analysed by Illumina MiSeq Sequencing, which revealed that microbial community in the Aerobic Reactor had the greatest diversity and richness. Bacteroidetes, Firmicutes and Proteobacteria were dominant phyla in the three Reactors, and Bacteroidales, Geobacter, ZB2 were the predominant functional microorganisms in the anAerobic, anoxic and Aerobic Reactors, respectively. Good removal efficiencies and presence of core microorganisms confirmed that the combined process was feasible for treating TCM wastewater.
Etienne Paul - One of the best experts on this subject based on the ideXlab platform.
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Combining thermophilic Aerobic Reactor (TAR) with mesophilic anAerobic digestion (MAD) improves the degradation of pharmaceutical compounds.
Water research, 2020Co-Authors: I. Gonzalez-salgado, L. Cavaillé, Simon Dubos, Evrard Mengelle, C. Kim, Mansour Bounouba, Etienne Paul, Sébastien Pommier, Yolaine BessiereAbstract:The removal efficiency of nine pharmaceutical compounds from primary sludge was evaluated in two different operating conditions: (i) in conventional Mesophilic AnAerobic Digestion (MAD) alone and (ii) in a co-treatment process combining Mesophilic AnAerobic Digestion and a Thermophilic Aerobic Reactor (MAD-TAR). The pilot scale Reactors were fed with primary sludge obtained after decantation of urban wastewater. Concerning the biodegradation of organic matter, thermophilic aeration increased solubilization and hydrolysis yields of digestion, resulting in a further 26% supplementary removal of chemical oxygen demand (COD) in MAD-TAR process compared to the conventional mesophilic anAerobic digestion. The highest removal rate of target micropollutants were observed for caffeine (CAF) and sulfamethoxazole (SMX) (>89%) with no substantial differences between both processes. Furthermore, MAD-TAR process showed a significant increase of removal efficiency for oxazepam (OXA) (73%), propranolol (PRO) (61%) and ofloxacine (OFL) (41%) and a slight increase for diclofenac (DIC) (4%) and 2 hydroxy-ibuprofen (2OH-IBP) (5%). However, ibuprofen (IBP) and carbamazepine (CBZ) were not degraded during both processes. AnAerobic digestion affected the liquid-solid partition of most target compounds. Sorbed fraction of pharmaceutical compounds on the sludge tend to decrease after digestion, this tendency being more pronounced in the case of the MAD-TAR process due to much lower concentration of solids.
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Combined thermophilic Aerobic process and conventional anAerobic digestion: effect on sludge biodegradation and methane production
Bioresource Technology, 2010Co-Authors: Claire Dumas, Etienne Paul, Serge Perez, Xavier LefebvreAbstract:The efficiency of hyper-thermophilic (65 degrees Celsius) Aerobic process coupled with a mesophilic (35 degrees Celsius) digester was evaluated for the activated sludge degradation and was compared to a conventional mesophilic digester. For two Sludge Retention Time (SRT), 21 and 42 days, the Chemical Oxygen Demand (COD) solubilisation and biodegradation processes, the methanisation yield and the Aerobic oxidation were investigated during 180 days. The best results were obtained at SRT of 44 days; the COD removal yield was 30% higher with the Mesophilic AnAerobic Digestion/Thermophilic Aerobic Reactor (MAD-TAR) co-treatment. An increase of the sludge intrinsic biodegradability is also observed (20-40%), showing that the unbiodegradable COD in mesophilic conditions becomes bioavailable. However, the methanisation yield was quite similar for both processes at a same SRT. Finally, such a process enables to divide by two the volume of digester with an equivalent efficiency.
