Effects of sludge age on anaerobic acidification of waste activated sludge: Volatile fatty acids production and phosphorus release  

作　　者：Sisi Chen Xiaohu Dai Dianhai Yang Bin Dong 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China

出　　处：《Journal of Environmental Sciences》2021年第7期11-21,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52000139);the China Post-doctoral Science Foundation(Grant number 2020M680058).

摘　　要：Effects of sludge age on volatile fatty acids (VFAs) production and Phosphorus (P) release during anaerobic acidification of waste activated sludge (WAS) were investigated.Sequencing batch reactors (SBR) fed with simulating domestic sewage were applied to produce WAS of different sludge ages,and batch tests were used for anaerobic acidification.The maximum dissolved total organic carbon,release of PO_(4)^(3+)-P,and accumulation of acetate (C2),propionate (C3),butyrate (C4),and valerate (C5) decreased by 56.2%,55.8%,52.6%,43.7%,82.4%and 84.8%,respectively,as the sludge age of WAS increased from 5 to 40 days.Limited degradation of protein played a dominating role in decreasing DTOC and VFAs production.Moreover,the increase in molecular weight of organics and organic nitrogen content in the supernatant after acidification suggested that the refractory protein in WAS increased as sludge age extended.Although the production of C2,C3,C4,and C5 from WAS decreased as the sludge age increased,the proportions of C2 and C3 in VFAs increased,which might be due to the declined production of C5 from protein and the faded genus Dechlorobacter.Keeping sludge age of WAS at a relatively low level (<10 days) is more appropriate for anaerobic acidification of WAS as internal carbon sources and P resource.

关 键 词：Sludge age Waste activated sludge ACIDIFICATION Volatile fatty acids Microbial community 

分 类 号：X703[环境科学与工程—环境工程]