Effects of anaerobic/anoxic time on simultaneous nitrification - endogenous denitrification and phosphorous removal from aerobic granular sludge
WANG Qi1, LI Dong1, LI Peng-yao1, CHEN Xiao-yi1, ZHANG Jie1,2
1. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China; 2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
Abstract：In this study, four groups of SBR reactors with the same specification was selected to explore effects of total nitrogen (TN) and total phosphorus (TP) removal from aerobic granular sludge under different anaerobic/anoxic time as 50/170, 90/130, 130/90, 180/40min and the hydrolytic acidification liquid as the influent matrix in A/O/A mode. The results show that the carbon (C) source reserves and P release from granular sludge increased with an increment in the anaerobic time from 50 to 90min. The efficiency of simultaneous nitrification and denitrification (SND) increased to 62.65%, and the removal rates of TN and TP increased from 81.1% to 92.9% and 82.2% to 98.5%, respectively. When the anaerobic time increased from 90 to 180min, the P release decreased and the anaerobic endogenous conditions stimulated the increase in EPS and the decrease in PHA synthesis, which led to a decrease in the TP removal rate to 88.1%. At the same time, when the anoxic time was shortened from 130 to 40min, more NOx- remained in the system, resulting in a reduction in TN removal rate to 84%. Mechanism analysis suggests that TN was consumed by denitrifying polyphosphate accumulating organisms and denitrifying glycogen accumulating organisms in the aerobic section by means of PHA in the form of SND; then further removed by endogenous denitrification of DGAOs in the anoxic section; and finally, TP was removed by PAOs and DPAOs. Our batch experiments demonstrated the highest proportion of DPAOs in R2, up to 41%. During the operation of the four groups of reactors, the particles did not disintegrate, implying that the particles cultured with hydrolytic acidification solution had complete structure and strong stability. We conclude that appropriate extension of anerobic/anoxic is conducive to strengthening the storage and transformation of internal C source, enhancing the effects of anaerobic P release, SND, and post endogenous denitrification, and realizing the efficient and stable operation of simultaneous nitrification-endogenous denitrification and P removal.
王琪, 李冬, 李鹏垚, 陈晓义, 张杰. 厌/缺氧时间对好氧颗粒污泥同步硝化内源反硝化和除磷的影响[J]. 中国环境科学, 2022, 42(9): 4199-4206.
WANG Qi, LI Dong, LI Peng-yao, CHEN Xiao-yi, ZHANG Jie. Effects of anaerobic/anoxic time on simultaneous nitrification - endogenous denitrification and phosphorous removal from aerobic granular sludge. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4199-4206.
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