A novel approach to estimate and control denitrification performance in activated sludge systems with respirogram technology  

作　　者：Zhihua Li Yali Zhang Zhenyu Hang Meng Lu Haiguang Wang Xingdong Gao Ruina Zhang 

机构地区：[1]Key Laboratory of Northwest Water Resource,Environment and Ecology,MOE,Xi’an University of Architecture and Technology,Xi’an 710055,China [2]Shaanxi Key Laboratory of Environmental Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China [3]Shanghai Environmental&Sanitary Engineering Design Institute Co.Ltd.,Shanghai 200232,China

出　　处：《Journal of Environmental Sciences》2022年第11期112-121,共10页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51878539, 52070149);the Technology Innovation and Level Promotion Project of Shanghai State-owned Assets Supervision and Administration Commission (No. 2018001)。

摘　　要：Respirogram technology has been widely applied for aerobic process, however, the response of respirogram to anoxic denitrification is still unclear. To reveal such response may help to design a new method for the evaluation of the performance of denitrification. The size distribution of flocs measured at different denitrification moments demonstrated a clear expansion of flocs triggered by denitrification, during which higher specific endogenous and quasi-endogenous respiration rates(SOUReand SOURq) were also observed. Furthermore,SOURqincreases exponentially with the specific denitrification rate(SDNR), suggesting that there should be a maximum SDNR in conventional activated sludge systems. Based on these findings, an index Rq/t, defined as the ratio of quasi-endogenous(OURq) to maximum respiration rate(OURt), is proposed to estimate the denitrification capacity that higher Rq/tindicates higher denitrification potential, which can be readily obtained without complex measurement or analysis, and it offers a novel and promising respirogram-based approach for denitrification estimation and control by taking measures to extend anoxic time to maintain its value at a high level within a certain range.

关 键 词：DENITRIFICATION Respirogram Activated sludge Oxygen uptake rate Biological nutrient removal 

分 类 号：X703[环境科学与工程—环境工程]