AnMBR用于餐厨垃圾和剩余污泥共发酵的性能研究

Performance of AnMBR for the co-digestion of food waste and waste activity sludge

通过连续实验和活性实验,系统地研究了厌氧膜生物反应器(AnMBR)在不同有机负荷(OLR)条件下处理餐厨垃圾和剩余污泥的效率、稳定性及动力学特征.结果表明,AnMBR在各工况下(OLR:3.22~12.92gCOD/(L·d))能够稳定运行.其中在OLR为6.48gCOD/(L·d)时运行性能最优,其甲烷产量为(4335±2)mL/d,甲烷产率为(361.2±0.2)mLCH_(4)/gCOD_(removal),COD的去除率维持在(98.6±0.9)%,pH值稳定在7.71±0.03.当OLR超过12.92gCOD/(L·d),反应器内挥发性脂肪酸(VFA)达到了6108mgCOD/L.膜污染以滤饼层污染为主;利用高通量测序(HTS)探究了系统中微生物的演变情况,Levilinea菌是优势细菌属,在OLR为6.48gCOD/(L·d)时其相对丰度最高(20.1%),Methanosarcina菌是优势古菌属,随着OLR增加相对丰度均维持在67%以上;比产甲烷活性实验表明随着OLR的增加,产甲烷菌对乙酸的降解能力不断提高.研究结果将为AnMBR处理餐厨垃圾和剩余污泥共发酵系统的最优工况选择提供参考依据.

Continuous experiments and activity experiments were conducted to systematically explore the effect of anaerobic membrane bioreactor(AnMBR)on the efficiency,stability,and kinetic characteristics of the treatment of food waste and waste activated sludge under different organic loading rates(OLRs).The results indicated that AnMBR can operate stably under various working conditions(OLR:3.22~12.92gCOD/(L·d)).When the OLR was 6.48gCOD/(L·d),the methane production was(4335±2)mL/d,the methane yield(calculated as COD)was(361.2±0.2)mLCH_(4)/gCOD_(removal),the COD removal efficiency was maintained at(98.6±0.9)%,and the pH was stable at 7.71±0.03.When the OLR exceeded 12.92gCOD/(L·d),the volatile fatty acid in the reactor reached 6108mg COD/L.Membrane fouling was dominated by cake layer fouling.High-throughput sequencing was used to characterize the evolution of microorganisms in the system.Levilinea was the dominant genus of bacteria,and its relative abundance was highest(20.1%)when the OLR was 6.48gCOD/(L·d).Methanosarcina was the dominant genus of archaea,and its relative abundance was maintained above 67%as the OLR increased.Specific methanogenic activity experiments showed that with the increase of OLR,the ability of methanogens to degrade acetic acid continues to increase..The results of this research provide useful information for the selection of optimal working conditions of AnMBR treatment for the co-digestion of food waste and waste activated sludge.