间歇梯度曝气的生活污水好氧颗粒污泥脱氮除磷  

Nitrogen and Phosphorus Removal from Domestic Sewage Aerobic Granular Sludge Under Intermittent Gradient Aeration

作　　者：张玉君 李冬[1] 李帅 张杰[1,2] ZHANG Yu-jun;LI Dong;LI Shuai;ZHANG Jie(Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]北京工业大学建筑工程学院水质科学与水环境恢复工程北京市重点实验室,北京100124 [2]哈尔滨工业大学环境学院城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《环境科学》2020年第8期3707-3714,共8页Environmental Science

基　　金：北京高校卓越青年科学家计划项目(BJJWZYJH01201910005019)。

摘　　要：本研究设置了3个SBR反应器R1、R2和R3,分别采用(A/O)3-SBR梯度曝气、(A/O)3-SBR恒定曝气和传统(A/O)-SBR方式运行,以实际城市生活污水为进水基质,探讨了不同曝气方式下的营养物去除性能和好氧颗粒污泥特性,为低强度城市污水的碳源合理利用提供合理的方式.由实验结果可知,R1、R2和R3中颗粒在稳定时期对COD的平均去除率分别为88.68%、89.05%和88.96%,对TN的平均去除率分别为76.97%、71.99%和64.92%,对TP的平均去除率分别为96.28%、85.05%和78.97%,且反硝化聚磷菌占聚磷菌的比例分别为25.52%、19.60%和12.77%.结果表明,厌氧、好氧和缺氧交替的运行方式更有利于反硝化聚磷菌(DPAOs)的富集,且梯度曝气较恒定曝气方式富集更多,这对碳源不足的低强度城市生活污水处理有重要意义;同时R1中曝气段溶解氧逐级降低,提高了颗粒同步硝化反硝化率和降低了能耗,有利于总氮(TN)的高效去除.3组反应器在运行后期颗粒粒径分别为727.368、815.072和895.041μm,且通过对颗粒进行显微观察可以看出,R2和R3中颗粒不如R1中密实.此外,R1、R2和R3运行后期PN/PS值分别为6.31、5.63和4.83,颗粒稳定时期EPS含量(以VSS计)分别为103.97、92.22和76.98 mg·g^-1,表明间歇梯度曝气的方式有利于刺激EPS的分泌,尤其是PN的分泌,使PN/PS值较高,细胞疏水性增强,颗粒密实稳定.In this study,three SBR reactors R1,R2,and R3 were set up and operated using(A/O)3-SBR gradient aeration,(A/O)3-SBR constant aeration,and the conventional(A/O)-SBR mode,respectively.The nutrient removal performance and aerobic granular sludge characteristics under these aeration modes were explored using real municipal wastewater as the influent matrix.The experimental results revealed that for the R1,R2,and R3 particles during the stable period,the average removal rate of COD was 88.68%,89.05%,and 88.96%,respectively,the average removal rate of TN was 76.97%,71.99%,and 64.92%,respectively,the average removal rate of TP was 96.28%,85.05%,and 78.97%,respectively,and the proportion of denitrifying phosphorus accumulating bacteria to phosphorus accumulating bacteria was 25.52%,19.60%,and 12.77%,respectively.The results showed that the operation mode of anaerobic,aerobic,and anoxic was more conducive to the enrichment of denitrifying phosphorus accumulating bacteria(DPAOs),and that the gradient aeration was more enriched than the constant aeration mode,which is of great significance to low-intensity municipal domestic sewage treatment with an insufficient carbon source.At the same time,the dissolved oxygen in the aeration section of R1 was reduced step-by-step,which improved the simultaneous nitrification and denitrification rates of particles and the utilization rate of the internal carbon source,which was beneficial for the efficient removal of TN.The particle size of the three groups of reactors was 727.368,815.072,and 895.041μm respectively.As the transfer rate of the matrix decreased with particle size,the microorganisms in R2 and R3 may have caused anaerobic respiration to release harmful gas,thus damaging the particle structure,such that the particles in R2 and R3 were less dense than those in R1.In addition,the PN/PS values of R1,R2,and R3 were 6.31,5.63,and 4.83,respectively,and the EPS content(in terms of VSS)was 103.97,92.22,and 76.98 mg·g^-1,respectively,at the time of particle stabilization,which revea

关 键 词：好氧颗粒污泥(AGS) 间歇梯度曝气 间歇恒定曝气 胞外聚合物(EPS) 反硝化除磷菌(DPAOs) 

分 类 号：X703.1[环境科学与工程—环境工程]