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Aerobic Reactor

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Marcelo Zaiat – One of the best experts on this subject based on the ideXlab platform.

Wen Qin – One of the best experts on this subject based on the ideXlab platform.

O.j. Skjelhaugen – One of the best experts on this subject based on the ideXlab platform.

  • Thermophilic Aerobic Reactor for processing organic liquid wastes
    Water Research, 1999
    Co-Authors: O.j. Skjelhaugen
    Abstract:

    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.

  • Microbial community composition and function in a pilot-scale anAerobic-anoxic-Aerobic combined process for the treatment of traditional Chinese medicine wastewater.
    Bioresource technology, 2017
    Co-Authors: Liqiang Meng, Wen Qin
    Abstract:

    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.

  • Combining thermophilic Aerobic Reactor (TAR) with mesophilic anAerobic digestion (MAD) improves the degradation of pharmaceutical compounds.
    Water research, 2020
    Co-Authors: I. Gonzalez-salgado, L. Cavaillé, Simon Dubos, Evrard Mengelle, C. Kim, Mansour Bounouba, Etienne Paul, Sébastien Pommier, Yolaine Bessiere
    Abstract:

    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 oxygoxygen 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.

  • Combined thermophilic Aerobic process and conventional anAerobic digestion: effect on sludge biodegradation and methane production
    Bioresource Technology, 2010
    Co-Authors: Claire Dumas, Etienne Paul, Serge Perez, Xavier Lefebvre
    Abstract:

    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 OxygOxygen 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.