Effect of citrate on productions of volatile fatty acids and methane in anaerobic batch fermentation of organic wastewater
The effects of citrate on methane production during the treatment of organic wastewater were investigated in batch assays at 37℃ and 120 r/min. The results showed that the methane fermentation was stimulated. At a sodium citrate concentration of 1.0 g/L, the methane production and biogas yield on glucose consumed increased by 38.5％ and 61.9％, respectively. However, the glucose consumption rate and the final pH value were 12.5％ and 7.1％ lower than those of the control, respectively. Further, difference of volatile fatty acids (VFA) during the course of anaerobic batch fermentation was obvious between citrate addition and the control. The maximal VAF concentration of control reached at 24 h, which was 82％ that of addition, and then reduced gradually. However, the VAF content of addition increased with cultivation, and the VAF production rate and VAF yield on glucose consumption increased by 232％ and 279％. The results suggest that citrate regulated the carbon flux to synthesis of VAF, which facilitated the precursor supply of methan synthesis, and then enhanced the efficiency of glucose utilization to methan and biogas production.
anaerobic batch cultivation volatile fatty acids biogas metabolism
Zhi Wang Yongze Wang Zhenhua Yu Xiong Chen Jinhua Wang Dongsheng Li
Hubei Provincial Key Laboratory of Industrial Microorganisms,Hubei University of Technology,Wuhan 430068 China
国际会议
广州
英文
1347-1350
2008-12-03（万方平台首次上网日期，不代表论文的发表时间）