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- Title
Analysis of the Syntrophic Anaerobic Digestion of Volatile Fatty Acids Using Enriched Cultures in a Fixed-Bed Reactor.
- Authors
Amani, T.; Nosrati, M.; Mousavi, S. M.; Kermanshahi, R. K.
- Abstract
Volatile fatty acids (VFAs) are key intermediates in anaerobic digestion. Enriched acetogenic and methanogenic cultures were used for the syntrophic anaerobic digestion of VFAs in a continuous fixedbed reactor at mesophilic conditions. The interactive effects of propionic (HPr), butyric (HBu), and acetic (HAc) acids were analyzed. Furthermore, hydraulic retention time (HRT) and methanogen-to-acetogen ratios (M/ As) were investigated as the key microbiological and operating variables of VFA anaerobic degradations. Experiments were carried out based on central composite design (CCD) and results were analyzed using response surface methodology (RSM). Effluent concentrations of HPr, HBu, HAc, and biogas production rate (BPR) were directly measured as responses. The optimum conditions were found to be HPr = 1122.9 mg/L, HBu = 1792.4 mg/L, HAc = 1735.4 mg/L, HRT = 21 hours, and M/A = 2.4 (corresponding to the maximum VFA removal and BPR). The results of verification experiments and predicted values from fitted correlations were in close agreement at a 95% confidence interval.
- Subjects
ANAEROBIC digestion; FATTY acids; ORGANIC compounds removal (Sewage purification); FIXED bed reactors; BIOGAS production; RESPONSE surfaces (Statistics); CONFIDENCE intervals
- Publication
Water Environment Research (10614303), 2012, Vol 84, Issue 5, p460
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143012X13347678384882