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High ammonia concentration involved in swine wastewater, which may cause lower performance efficiency during process due to the inhibition of microbial activity related with anaerobic process. This study investigated experimentally the significant aspects on both acidogenic and methanogenic population dynamics in anaerobic batch process treating swine wastewater. For observation of microorganisms adapted in high ammonia concentration, we conducted anaerobic batch processes with duplication for 3 months. During the reactions,
the chemical oxygen demand concentration of two reactors decreased by about 68% and 75% of the input swine wastewater and 67 L and 64 L of methane was produced, respectively. During the reactions, there were maintained with high ammonia concentration from 3.4 g/L to 4.1 g/L and total kjeldahl nitrogen from 5.8 g/L to 5.3 g/L. The bacteria denaturing gradient gel electrophoresis (DGGE) profiles showed that Lactobacillus. delbrueckii were identified as major group. Therefore, L.delbrueckii was supposed that it would play an important role in
acidogenesis. Also, from methanogenic DGGE profiles, we can infer that the methane gas observed in the overall process was produced by the activity of Methanoculleus marisnigri JR1 and Methanocorpusculum labreanum Z, belonging to the order Methanomicrobiales.