摘要
由于人工快渗(CRI)系统对TN去除率较低,该技术在污水处理领域的应用受到限制。为提高TN去除率,将电极生物膜和硫自养反硝化技术耦合应用于CRI系统,考察了“异养+氢自养+硫自养”反硝化脱氮的可行性,并通过菌群结构解析了电极生物膜耦合硫自养强化脱氮的机理。结果表明,电极生物膜耦合硫自养强化型CRI系统在电流强度为15 mA时,TN平均去除率可达73.0%,相比传统CRI系统提高了48.0百分点。从稳定运行的电极生物膜耦合硫自养强化型CRI系统反硝化区共检测出231个已知菌属,其中具有硫自养反硝化功能的产硫酸杆菌属(Thiobacillus)和具有氢自养反硝化功能的噬氢菌属(Hydrogenophaga)相对丰度较高,分别为35.9%、15.7%。硫自养反硝化、氢自养反硝化和异养反硝化的共同作用促进了CRI系统脱氮性能的提高。
As TN removal efficiency of constructed rapid infiltration(CRI)system was low,its application in wastewater treatment was limited.In order to improve its TN removal efficiency,the electrodes biofilm coupled sulfur autotrophic technology was applied to CRI system.The feasibility of denitrification by“heterotrophic+hydrogen autotrophic+sulfur autotrophic”technology was investigated.The mechanism of enhanced denitrification by electrodes biofilm coupled sulfur autotrophic technology was analyzed via microbial structure analysis.The results showed that the average removal efficiency of TN reached 73.0%when the current intensity was 15 mA in the electrode biofilm coupled sulfur autotrophic enhanced CRI system,which was 48.0 percentage points higher than the traditional CRI system.A total of 231 known bacterial genera were detected in the denitrification zone in the stable period of electrode biofilm coupled sulfur autotrophic enhanced CRI system.The relative abundance of Thiobacillus with the function of sulfur autotrophic denitrification and Hydrogenophaga with the function of hydrogen autotrophic denitrification were 35.9%and 15.7%,respectively.The combined action of sulfur autotrophic denitrification,hydrogen autotrophic denitrification and heterotrophic denitrification promoted the improvement of denitrification performance of CRI system.
作者
陈佼
陆一新
王瑞
江庆
张建强
CHEN Jiao;LU Yixin;WANG Rui;JIANG Qing;ZHANG Jianqiang(College of Architectural and Environmental Engineering,Chengdu Technological University,Chengdu Sichuan 611730;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu Sichuan 611756)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2019年第9期1018-1022,共5页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.41502333)
四川省环境污染防治重点研发项目(No.2017SZ0179)
四川省科技计划项目(No.2019JDRC0136)
成都工业学院智慧环保大数据研究中心专项科研基金项目(No.P18503008)
关键词
脱氮
硫自养
氢自养
人工快渗
反硝化
nitrogen removal
sulfur autotrophic
hydrogen autotrophic
CRI
denitrification
