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在常温下,采用沼气循环厌氧膜生物反应器(MCAn MBR)处理模拟高盐有机废水,当进水Na Cl浓度<19.21 g/L、温度>22℃时,盐度对厌氧微生物没有明显的抑制作用,对COD的去除率>94%;在温度为14.9~18.1℃,MLSS为23.79~32.22 g/L,进水Na Cl浓度分别为17.0~18.0、18.0~19.0 g/L时,经短期驯化,对COD的平均去除率分别为83.37%、82.61%;而当进水Na Cl浓度>19.0 g/L时,对COD的去除率明显下降,且短期内无法恢复。MCAn MBR高效的污泥截留作用增强了微生物的耐盐性能,高污泥浓度是厌氧膜生物反应器在高盐环境下取得高有机物去除率的关键。
At normal temperature, the biogas circulating anaerobic membrane bioreactor (MCAn MBR) was used to treat simulated high salinity organic wastewater. When the influent NaCl concentration was <19.21 g / L and the temperature was> 22 ℃, the salinity did not show significant anaerobic microbes , The removal rate of COD was> 94%. When the MLSS was 23.79 ~ 32.22 g / L at the temperature of 14.9 ~ 18.1 ℃ and the concentration of NaCl in the influent was 17.0 ~ 18.0 and 18.0 ~ 19.0 g / L, Short-term domestication, the average removal rates of COD were 83.37% and 82.61%, respectively. However, when the influent NaCl concentration was> 19.0 g / L, the removal rate of COD decreased obviously and could not be recovered in short term. MCAn MBR efficient sludge retention enhances the salt tolerance of microorganisms, and high sludge concentration is the key to achieving high organic removal rates under high salt conditions in anaerobic membrane bioreactors.