This study investigated the impact of temperature on the efficiency of an anaerobic membrane bioreactor(AnMBR)treating real domestic wastewater.Methanogenic efficacy and membrane fouling characteristics were evaluated at different temperatures(25,20,and 15 ℃)and hydraulic retention times(HRTs)(12 hours and 8 hours).Results showed that COD removal rate was 81.9％and the maximum methane yield was 0.21 L·g-1 by AnMBR at 25 ℃.The anaerobic digestion performance of AnMBR at 20 ℃ was similar to that at 25 ℃.However,COD removal rate was 73.5％and the maximum methane yield was 0.08 L·g-1 at 15 ℃.Microbial community analysis indicated acetate as the primary methanogenic pathway,and decreased temperatures led to a significant decrease in the abundance of acetate-consuming methanogens.The decline in anaerobic digestion performance at 15 ℃ was attributed to the diminished microbial activity of methanogens.At 25 ℃,the membrane fouling rate with an HRT of 8h was 30.33 times higher than 12h,highlighting challenges in achieving long-term stable operation at lower HRTs and temperatures.Membrane resistance analysis revealed an increase in organic matter blockage with decreasing temperature,potentially due to elevated extracellular polymer production.COD equilibrium results showed a correlation between dissolved methane release and both methane solubility and the effluent flux magnitude.
real domestic wastewateranaerobic membrane bioreactortemperatureresource recoverydissolved methane
维普
万方数据
