Effect of temperature on the efficacy of anaerobic membrane bioreactors for domestic wastewater treatment
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
万方数据
维普
