活性污泥中硝酸盐异化还原为铵的影响因素研究  

Factors Influencing Dissimilatory Nitrate Reduction to Ammonium in Activated Sludge

作　　者：万琼[1] 郝婧羽 张新艳[1] 鞠恺 王文静 任迎春 黄鑫 WAN Qiong;HAO Jingyu;ZHANG Xinyan;JU Kai;WANG Wenjing;REN Yingchun;HUANG Xin(School of Municipal Eengineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《河南科技大学学报（自然科学版）》2021年第5期98-104,M0008,共8页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家重点研发计划专项“西部典型缺水地区农村给排水集成技术与应用示范”(2016YFC0400703-3);污染控制与资源化研究国家重点实验室开放基金项目(PCRRF18014);陕西省教育厅科研创新基金项目(20JK0768);西安科技大学培育基金项目(201724);西安科技大学博士(后)启动基金项目(2018QDJ005)。

摘　　要：针对活性污泥系统中硝酸盐异化还原为铵(DNRA)导致系统脱氮效率降低的问题,通过长期驯化培养试验、批式试验和高通量测序,考察水力停留时间(HRT)、硫离子(S^(2-))的投加和流态对活性污泥中DNRA氨化的影响。研究结果表明:间歇流条件下,当HRT由6 h延长至36 h时,DNRA氨化随着HRT的延长而增强,系统中生成氨氮质量浓度由0.43 mg/L逐渐增长至15.98 mg/L;连续流条件下,当HRT由6 h延长至48 h时,系统中生成氨氮质量浓度由2.03 mg/L逐渐增长至20.78 mg/L。投加S^(2-)可有效促进硝酸盐氮转化成氨氮,当向系统投加20 mg/L的S^(2-)时,间歇流和连续流系统出水氨氮质量浓度分别增加了11.58%和24.82%。且连续流下投加S^(2-)后,DNRA功能菌总丰度比投加前提高了22.65%。在改变HRT和进水S^(2-)质量浓度时,连续流系统中硝酸盐氮转化成氨氮比例均普遍高于间歇流系统。Dissimilatory nitrate reduction to ammonia( DNRA) in activated sludge system leads to low total nitrogen( TN) removal efficiency. The effects of hydraulic retention time( HRT),sulfion( S2-) addition and flow regime on DNRA in activated sludge were investigated by long-term domestication culture experiment,batch test and high throughput sequencing.The theoretical support were provided to reduce or eliminate DNRA and improve nitrogen removal efficiency. The results show that the DNRA is enhanced with the extension of HRT( from 6 h to 36 h) under intermittent flow conditions. The ammonia concentration of system increases gradually from 0.43 mg/L to 15. 98 mg/L. Under continuous flow conditions,the ammonia concentration of system increases gradually from 2. 03 mg/L to 20. 78 mg/L with the extension of HRT( from 6 h to 48 h).Adding S2-effectively promotes reduction nitrate to ammonia. When 20 mg/L S2- is added to the system,the ammonia concentration production in the intermittent and continuous flow systems increases by 11. 58% and24. 82%,respectively.Moreover,the total abundance of DNRA functional bacteria increases by 22. 65% after S2- addition.The conversion ratio of nitrate to ammonia in continuous flow system is generally higher than that in intermittent flow system when HRT and influent S2-concentration are changed.

关 键 词：HRT S^(2-) 流态 硝酸盐异化还原为铵 

分 类 号：X703[环境科学与工程—环境工程]