摘要
采用微氧升流式膜生物反应器(UMSB-MBR)启动同步亚硝化-厌氧氨氧化耦合异养反硝化(SNAD)工艺,拟通过构建数学模型实现工艺启动过程分析及其优化过程预测.结果表明:反应器历经厌氧氨氧化和全程自养脱氮(CANON)工艺后,通过引入有机碳源(C/N比为0.5)启动SNAD工艺(总氮去除率可达87.66%),并运用ASM1模型及实验数据成功建立SNAD工艺启动模型;通过模型分析发现,氮负荷(NLR)的增大(由0.24~1.88kg/(m^(3)·d)),适宜的溶解氧(DO)浓度(0.2~0.4mg/L)均有利于SNAD工艺的快速启动;通过模型预测发现,随着C/N比(由0.5~3.0)增大,反硝化菌(DNB)对厌氧氨氧化菌(An AOB)活性的抑制程度不断增强,造成脱氮主要途径由厌氧氨氧化向异养反硝化过程转化,综合考虑C/N比为1.5时SNAD工艺效能和微生物菌群配置处于最佳状态.
An up-flow micro-oxygen membrane bioreactor(UMSB-MBR)was utilized to start up the simultaneous nitrification,anaerobic ammonia oxidation coupling with heterotrophic denitrification(SNAD)process,and a mathematical model was planned to be built to realize the start-up process analysis and the optimization process prediction.The results showed that the SNAD process(the total nitrogen removal rate of 87.66%)started up successfully by inducing the carbon source(C/N ratio of 0.5)after anammox and completely autotrophic nitrogen removal(CANON)processes in the bioreactor,and the start-up model of the SNAD process was successfully built using the ASM1 model and experimental data;the model analysis revealed that the increase in the nitrogen loading rate(NLR)(from 0.24 kg/(m^(3)·d)to 1.88 kg/(m^(3)·d))and the suitable dissolved oxygen(DO)(0.2~0.4 mg/L)accelerated the start-up of the SNAD process;the model prediction revealed that the inhibition of anaerobic ammonia-oxidizing bacteria(AnAOB)from denitrifying bacteria(DNB)was strengthened with the increase in the C/N ratio(from 0.5 to 3.0),and shifted the major nitrogen removal pathway from anammox to heterotrophic denitrification process.From the comprehensive consideration,the appropriate C/N ratio should be chosen at 1.5 under which the process performance and distribution of the microbial flora could be at the best state of the SNAD process.
作者
王朝朝
高鹏
闫立娜
殷耀兵
张欢
武新娟
殷春雨
马骏
李思敏
WANG Zhao-zhao;GAO Peng;YAN Li-na;YIN Yao-bin;ZHANG Huan;WU Xin-juan;YIN Chun-yu;MA Jun;LI Si-min(Hebei Technology Innovation Center for Water Pollution Control and Water Ecological Remediation,School of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038,China;College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China;School of Materials Science and Engineering,Hebei University of Engineering,Handan 056038,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2021年第8期3590-3600,共11页
China Environmental Science
基金
河北省自然科学基金项目(E2021402011)
河北省高校青年拔尖人才计划项目(BJ2019029)
邯郸市科技研发计划项目(1623209044)。