藻-菌颗粒污泥处理低C/N生活污水的研究  

Insight into the treatment of low C/N domestic sewage by microalgal-bacterial granular sludge

作　　者：张夏 陈红兵[1] 胡惠秩 汪锐 陈乐言 万仁辉 徐芳 ZHANG Xia;CHEN Hongbing;HU Huizhi;WANG Rui;CHEN Leyan;WAN Renhui;XU Fang(Faculty of Resources and Environmental Science,Hubei University,Wuhan 430062,China)

机构地区：[1]湖北大学资源环境学院,湖北武汉430062

出　　处：《湖北大学学报（自然科学版）》2024年第1期60-67,共8页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金青年科学基金(51808200);湖北省自然科学基金(2022CFB500)资助。

摘　　要：在光暗交替、零曝气条件下建立两组不同进水C/N(chemical oxygen demand,COD/total nitrogen,TN)(R_(1):10.0,R 2:5.6)的序批式反应器并运行了70 d,研究微藻-细菌颗粒污泥(microalgal-bacterial granular sludge,MBGS)在低C/N进水条件下的污染物去除效果、颗粒组成及稳定性的变化。研究发现,R^(1)组颗粒形态稳定,结构紧密,而R^(2)组颗粒形态出现差异化,结构略松散。R^(2)的COD去除率无显著变化,并且有更好的NH_(4)^(+)-N去除效果(94.68±7.24)%,但其PO_(4)^(3-)-P的去除效果不佳(50.69±13.64)%。通过元素分析进一步发现低C/N条件使MBGS中细菌的比例增加36%,并证明低C/N生活污水中的COD和PO_(4)^(3-)-P主要依靠MBGS的同化作用去除,NH_(4)^(+)-N主要被细菌的硝化作用转化。此外,低C/N组中蛋白质含量显著增加,并分泌更多的松散结合EPS(loosely bound EPS,LB-EPS)来提高颗粒稳定性。In this study,two sequencing batch reactors with different influent water C/N(R_(1):10.0,R 2:5.6)were established and operated for 70 days under alternating light-dark and zero aeration conditions.The changes in pollutant removal effect,composition and stability of microalgal-bacterial granular sludge(MBGS)under low C/N(COD/TN)were studied.It was found that R 1 group had stable particle morphology and tight structure,while R _(2) group had different particle morphology and slightly loose structure.R_(2)showed no significant change in COD removal and had better NH_(4)-N removal(94.68±7.24)%,but poor PO_(4)^(3-)-P removal(50.69±13.64)%.Elemental analysis further revealed that low C/N conditions increased the proportion of bacteria in MBGS by 36%,and demonstrated that the removal of COD and PO_(4)^(3-)-P in low C/N domestic wastewater relied mainly on the assimilation of MBGS,and NH_(4)^(+)-N was mainly transformed by bacterial nitrification.In addition,protein content was significantly increase in the low C/N group,and more loosely bound extracellular polymeric substances were secreted to improve particle stability.

关 键 词：藻-菌颗粒污泥 低C/N比 零曝气 同化作用 硝化作用 

分 类 号：X703.1[环境科学与工程—环境工程]