Li Chengyue, Maqbool Tahir, Kang Hongyu, Zhang Zhenghua
Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
Membranes (Basel). 2022 Jun 27;12(7):659. doi: 10.3390/membranes12070659.
Conventional and advanced biological wastewater treatment systems generate excess sludge, which causes socio-economic and environmental issues. This study investigated the performance of membrane-controlled anoxic-oxic-anoxic (AOA) bioreactors for in-situ sludge reduction compared to the conventional anoxic-oxic-oxic membrane bioreactor (MBR). The membrane units in the AOA bioreactors were operated as anoxic reactors at lower sludge recirculation rates to achieve hydrolysis of extracellular polymeric substances (EPS) and extensive endogenous respiration. Compared to MBR, the AOA bioreactors operated with 90%, and 80% recirculation rates reduced the sludge growth up to 19% and 30%, respectively. Protein-like components were enriched in AOA bioreactors while fulvic-like components were dominant in MBR. The growth of and genra was promoted in AOA bioreactors and thus sludge reduction was facilitated. Metagenomics analysis uncovered that AOA bioreactors exhibited higher proportions of key genes encoding enzymes involved in the glycolysis and denitrification processes, which contributed to the utilization of carbon sources and nitrogen consumption and thus sludge reduction.
传统和先进的生物废水处理系统会产生剩余污泥，这会引发社会经济和环境问题。本研究调查了膜控制的缺氧-好氧-缺氧（AOA）生物反应器与传统的缺氧-好氧-好氧膜生物反应器（MBR）相比在原位污泥减量方面的性能。AOA生物反应器中的膜单元在较低的污泥回流率下作为缺氧反应器运行，以实现细胞外聚合物（EPS）的水解和广泛的内源呼吸。与MBR相比，以90%和80%的回流率运行的AOA生物反应器分别将污泥生长减少了19%和30%。类蛋白质成分在AOA生物反应器中富集，而类富里酸成分在MBR中占主导。AOA生物反应器中 和 属的生长得到促进，从而有利于污泥减量。宏基因组学分析发现，AOA生物反应器中编码参与糖酵解和反硝化过程的酶的关键基因比例更高，这有助于碳源的利用和氮的消耗，从而实现污泥减量。
