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Performance evaluation of a two-phase anaerobic digestion process of synthetic domestic wastewater at ambient temperature

AuthorsGuerrero, Lorna; Montalvo, Silvio; Coronado, Eugenio; Chamy, Rolando; Poirrier, Paola; Crutchik, D.; Sánchez, Enrique; Rubia, M. Ángeles de la ; Borja Padilla, Rafael
KeywordsTwo-phase anaerobic digestion
Hydrolytic stage
Methanogenic stage
Synthetic domestic wastewater
Issue DateJun-2009
PublisherTaylor & Francis
CitationJournal of Environmental Science and Health, Part A 44(7): 673-681 (2009)
AbstractA two-phase anaerobic digestion process of synthetic domestic wastewater was studied at ambient temperature in mild to cold climates. The hydrolytic stage was carried out in a continuous stirred tank reactor with an effective volume of 1.2 L. The hydrolytic reactor operated at hydraulic retention times (HRTs) in the range of 1.3 to 2.7 h, which allowed for optimum HRT to be obtained in order to achieve a maximum amount of soluble COD. For the methanogenic stage, an up-flow anaerobic filter with a volume of 1.35 L and corrugated plastic rings as biomass immobilization support were used. During the investigation, the ambient temperature ranged between 21°C and 24°C. Synthetic domestic wastewater with a COD of 700 mg/L was used as substrate. The study was performed at total organic loading rates (OLR T ) of 2.0–4.3 g COD/L· d, with a global HRT (including both hydrolytic and methanogenic stages) of 2.8–5.8 hours. A maximum percentage of organic matter removed of 88% was achieved at a global HRT of 5.8 hours. Under these operating conditions, the production of biogas was 97% higher than that obtained in the one-phase anaerobic digestion process. Additionally, the kinetics involved in the hydrolytic stage was determined using the Contois kinetic model, which adequately predicted the experimental results.
Publisher version (URL)http://dx.doi.org/10.1080/10934520902847794
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