摘要
采用改进型ABR-MBR反应器,接种普通活性污泥,以氨氮为200 mg·L^-1、C/N=1的人工配水为处理对象,研究全程自养脱氮耦合反硝化除磷一体式工艺的启动及其脱氮除磷效能.控制反应器运行条件:温度为(25±1)℃,pH=7.5±0.2,回流比由50%逐步提升至200%.结果表明,ABR厌氧阶段消耗70%COD,使得在低DO、高氨氮下能够21 d内快速启动部分亚硝化;随后以间歇曝气(曝停比:2 h∶2 h,DO为0.3~0.4 mg·L^-1)的运行方式在132 d内成功启动耦合工艺内的CANON部分,使得ABR缺氧段的电子受体中硝酸盐氮浓度稳步上升,最终于160 d成功启动耦合工艺.稳定运行后,MBR内TN去除负荷达到0.22 kg·(m^3·d)^-1,出水各项指标COD、TN和PO4^3--P去除率分别为87.0%、90.4%和81.8%.批次试验估算ABR内以硝酸氮盐为电子受体的PAOs约占PAOs的68%,系统内已培育出相互适应协作的DPAOs、AOB和An AOB菌种,具有良好同步脱氮除磷效果.
A process coupled completely autotrophic nitrogen removal over nitrite(CANON)with denitrifying phosphorus removal in a modified anaerobic baffled reactor(ABR)coupled with a membrane bioreactor(MBR),inoculated with ordinary activated sludge,was proposed for treating artificial wastewater with ammonia 200 mg·L^-1 and COD/TN=1.This experiment studied the start-up of the process and its nitrogen and phosphorus removal efficiency by controlling the recycle ratio and increasing it from 50%to 200%step by step,with a temperature of(25±1)℃and pH of 7.5±0.2.The results showed that the anaerobic part in the ABR consumed 70%COD,and resulted in a quick start-up of partial-nitrification at 21 d under low DO and high ammonia nitrogen.Then,by controlling the intermittent aeration(exposure stop ratio:2 h∶2 h,DO 0.3-0.4 mg·L^-1),the start-up of the CANON part in the coupling process was successfully achieved at 132 d,such that the concentration of nitrates in the electron acceptor of the ABR anoxic section increased steadily,and finally the coupling process started successfully at 160 d.With stable operation,the TN removal load in the MBR reached0.22 kg·(m^3·d)^-1,and the average removal efficiency of COD,TN,and PO4^3--P was 87.0%,90.4%,and 81.8%,respectively.The batch experiment estimated that the denitrifying phosphate accumulating organisms(DPAOs)using nitrates as electron acceptors in the ABR accounted for 68%of the phosphate accumulating organisms(PAOs).The DPAOs,ammonia-oxidizing bacteria(AOB),and anaerobic ammonium oxidizing bacteria(An AOB)have been developed in the system and have good simultaneous nitrogen and phosphorus removal efficiency.
作者
印雯
陈亚
张钰
徐乐中
吴鹏
刘文如
YIN Wen;CHEN Ya;ZHANG Yu;XU Le-zhong;WU Peng;LIU Wen-ru(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;National Regional Engineering Laboratory of Urban Domestic Wastewater Resources Utilization Technology,Suzhou 215009,China;Jiangsu High Education Collaborative Innovation Center of Water Treatment Technology and Material,Suzhou 215009,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2019年第11期5032-5039,共8页
Environmental Science
基金
国家自然科学基金项目(51578353)
江苏省自然科学基金项目(BK20160356)
江苏省高校优秀中青年教师和校长境外研修计划项目
关键词
全程自养脱氮(CANON)
反硝化除磷
耦合
启动
脱氮除磷
completely autotrophic nitrogen removal over nitrite(CANON)
denitrifying phosphorus removal
coupling
start-up
nitrogen and phosphorus removal
