Feasibility of low-intensity ultrasound treatment with hydroxylamine to accelerate the initiation of partial nitrification and allow operation under intermittent aeration  

作　　者：Jianxiong Jian Xiaojian Liao Zhihua Mo Shoupeng Li Lei Li Shaojin Chen Zhenhua Huang Junhao Chen Wencan Dai Shuiyu Sun 

机构地区：[1]Guangzhou Key Laboratory Environmental Catalysis and Pollution Control,Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control,School of Environmental Science and Engineering,Institute of Environmental Health and Pollution Control,Guangdong University of Technology,Guangzhou 510006,China [2]Guangdong Province Solid Waste Recycling and Heavy Metal Pollution Control Engineering Technology Research Center,Guangdong Polytechnic of Environmental Protection Engineering,Foshan 528216,China [3]Analysis and Test Center,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Journal of Environmental Sciences》2024年第5期446-459,共14页环境科学学报（英文版）

摘　　要：Partial nitrification is a key aspect of efficient nitrogen removal,although practically it suf-fers from long start-up cycles and unstable long-term operational performance.To address these drawbacks,this study investigated the effect of low intensity ultrasound treatment combined with hydroxylamine(NH2OH)on the performance of partial nitrification.Results showthat compared with the control group,low-intensity ultrasound treatment(0.10W/mL,15 min)combined with NH2OH(5 mg/L)reduced the time required for partial nitrification initiation by 6 days,increasing the nitrite accumulation rate(NAR)and ammonia nitro-gen removal rate(NRR)by 20.4% and 6.7%,respectively,achieving 96.48% NRR.Mechanis-tic analysis showed that NH2OH enhanced ammonia oxidation,inhibited nitrite-oxidizing bacteria(NOB)activity and shortened the time required for partial nitrification initiation.Furthermore,ultrasonication combined with NH2OH dosing stimulated EPS(extracellular polymeric substances)secretion,increased carbonyl,hydroxyl and amine functional group abundances and enhanced mass transfer.In addition,16S rRNA gene sequencing results showed that ultrasonication-sensitive Nitrospira disappeared from the ultrasound+NH_(2)OH system,while Nitrosomonas gradually became the dominant group.Collectively,the results of this study provide valuable insight into the enhancement of partial nitrification start-up during the process of wastewater nitrogen removal.

关 键 词：Partial nitrification Low-intensity ultrasound HYDROXYLAMINE Ammonia oxidizing bacteria Nitrite oxidizing bacteria 

分 类 号：X703[环境科学与工程—环境工程]