进水分配比对分段进水PN/A工艺脱氮性能影响
Optimizing nitrogen removal in PN/A process:Step-Feed influence analysis
李冬 1王凯璐 1祝彦均 1吕恒康 1张杰2
作者信息
- 1. 北京工业大学水质科学与水环境恢复工程北京市重点实验室,北京 100124
- 2. 北京工业大学水质科学与水环境恢复工程北京市重点实验室,北京 100124;哈尔滨工业大学,城市水资源与水环境国家重点实验室,黑龙江 哈尔滨 150090
- 折叠
摘要
以预脱碳污水和市政污水作为目标污水,建立了好氧段分段进水的新模式,通过调整进水分配比来优化好氧段C/N,以期实现短程硝化-厌氧氨氧化(PN/A)工艺在实际工况下的稳定运行.采用4组以好氧/缺氧/好氧/缺氧(O/A/O/A)模式运行的序批式反应器(SBR),R1、R2、R3及R4以进水分配比(预脱碳污水:市政污水)分别为1:0、2:1、1:1及1:2的分段进水模式运行.结果表明,R1未能实现PN/A工艺,总氮去除率(NRE)仅为60.2%.随着进水分配比不断下降,R2、R3、R4分别在第34,30及36d实现PN/A工艺,NRE分别达到71.8%、80.3%及74.1%.其中R3系统处理性能最好且最稳定,厌氧氨氧化贡献率达到 83.9%.污泥沉降性与粒径最佳.此外,高通量结果显示氨氧化菌(Nitrosomonas)和厌氧氨氧化菌(Candidatus_Kuenenia)丰度分别为 2.74%和12.17%,且与好氧异养菌(AHB)形成了良好的协同作用.因此,分段进水模式在进水分配比为1:1时有利于实现稳定的PN/A工艺,此时各功能微生物可得到较好富集与平衡.
Abstract
In this work,a novel model was established to optimize the C/N in the aerobic section based on the regulation of the influent distribution ratio of each aerobic section,using pre-decarbonized wastewater and municipal wastewater as target wastewater.This work was aiming at achieving the stable operation of the partial nitrification-anammox(PN/A)process under realistic conditions.Four groups of sequential batch reactors(SBR)with the same specifications run in oxic/anoxic/oxic/anoxic(O/A/O/A)mode,R1,R2,R3,and R4 operated in the step-feed mode with the influent distribution ratios(pre-decarbonized wastewater:municipal wastewater)of 1:0,2:1,1:1,and 1:2.The results illustrated that R1failed to realize the PN/A process and total nitrogen removal efficiency(NRE)was only 60.2%.Along with the decreasing influent distribution ratio,R2,R3,and R4 completed the PN/A process on the 34th,30th,and 36th days,which NRE reaching 71.8%,80.3%,and 74.1%.Among them,R3 had the optimized performance with best stability,and the contribution of anammox reaching 83.9%.It was revealed that sludge exhibited excellent settling characteristics and optimal particle size.Moreover,high-throughput data also demonstrated the abundance of ammonia-oxidizing bacteria(Nitrosomonas)and anammox bacteria(Candidatus_Kuenenia)at 2.74%and 12.17%.These microbial populations synergized effectively with aerobic heterotrophic bacteria(AHB).Hence,the step-feed model could be conductive to achieve a stable PN/A process.The influent distribution ratio of 1:1was suggested as a suitable reference value,fostering better enrichment and balance of functional microorganisms.
关键词
分段进水/PN/A工艺/进水分配比/竞争性抑制Key words
step-feed/PN/A process/influent distribution ratio/competitive inhibition引用本文复制引用
基金项目
北京高校卓越青年科学家计划项目(BJJWZYJH01201910005019)
出版年
2024
NETL
NSTL
万方数据