摘要
采用MUCT工艺处理低C/N比实际生活污水,研究在全程硝化及短程硝化模式下系统的反硝化除磷性能.MUCT反应器在常温下运行180 d,结果表明,采用低DO和短水力停留时间(HRT)实现了短程硝化,亚硝酸盐积累率达到70%以上.系统表现出较好的反硝化除磷性能,短程硝化期间磷的去除率和反硝化除磷率分别为90%和91%,全程硝化期间磷的去除率和反硝化除磷率分别为60%和88%.虽然短程硝化模式下磷的去除效果明显优于全程硝化模式,但荧光原位杂交(FISH)试验结果表明,2种模式下污泥中PAOs占总菌群的比例基本相同,平均为37%.COD去除效果稳定,试验期间出水COD均低于50 mg.L-1.不同硝化模式下污泥的批次试验表明:短程硝化期间,以NO2--N作为电子受体为主的反硝化除磷菌占总聚磷菌的比例和全程硝化期间以NO3--N作为电子受体为主的反硝化除磷菌的比例相比没有明显变化,平均为38%;与全程硝化时期相比,短程硝化阶段对有限碳源的利用率更高,磷的去除效果更好.短程硝化模式下的反硝化除磷更有利于低碳源污水的处理.
The performance of denitrifying phosphorus removal under nitrification and nitritation was investigated in a lab-scale Modified University of Cape Town（MUCT） process treating real domestic wastewater with low C/N ratio.The experimental results of 180 days showed that nitritation was achieved at short hydraulic retention time（HRT） and low dissolved oxygen（DO） of 0.3-0.5 mg·L-1,and an average nitrite accumulation rate（NAR） of above 70% was achieved during nitritation stage.The MUCT process showed a good performance of denitrifying phosphorus removal.Under nitritation mode,total and denitrifying phosphorus removal efficiencies were 90% and 91%,respectively;under nitrification mode,total and denitrifying phosphorus removal efficiencies were 60% and 88%,respectively.Although phosphorus removal performance under nitritation was better than that under nitrification,the results of fluorescence in situ hybridization（FISH） indicated that the percentage of phosphorus accumulating organisms（PAOs） in biomass was about 37% under two modes.The effluent COD concentration was below 50 mg·L-1 during the experimental period.Batch tests of different nitrifying sludges showed that the percentage of denitrifying phosphorus removal bacteria（DPBs） in PAOs using NO-2-N as an electron acceptor under nitritation mode was almost the same as that using NO-3-N as an electron acceptor under nitrification mode,with an average percentage of 38%.Compared with nitrification mode with conventional phosphorus removal,nitritation mode with denitrifying phosphorus removal has a superior performance treating limited carbon source wastewater.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2012年第10期3513-3521,共9页
Environmental Science
基金
教育部新世纪优秀人才支持计划项目(NCET-11-0891)
北京市自然科学基金项目(8102005)
霍英东教育基金会高等院校青年教师基金项目(121076)
关键词
MUCT工艺
生活污水
全程硝化
短程硝化
反硝化除磷
MUCT process
domestic wastewater
nitrification
nitritation
denitrifying phosphorus removal
