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工程科学与技术:2017,49(2):240-247
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A2/O+MBBR系统的快速启动及反硝化除磷特性
(1.北京工业大学 国家工程实验室 北京市污水脱氮除磷处理与过程控制工程技术研究中心, 北京 100124;2.扬州大学 环境科学与工程学院, 江苏 扬州 225127)
Rapid Start-up and Denitrifying Phosphorus Removal Characteristics of A2/O+MBBR Process
(1.National Eng. Lab. for Advanced Municipal Wastewater Treatment and Reuse Technol., Eng. Research Center of Beijing, Beijing Univ. of Technol., Beijing 100124, China;2.College of Environmental Sci. and Eng., Yangzhou Univ., Yangzhou 225127, China)
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投稿时间:2016-10-18    修订日期:2017-01-03
中文摘要: 针对A2/O+移动床生物膜反应器(A2/O+MBBR)双污泥系统,以低碳氮比(C/N)生活污水为处理对象,考察启动过程的污泥特性和反硝化除磷特性,基于脱氮除磷的代谢机理建立系统的快速启动策略。研究结果表明:启动过程历时21 d完成,污泥结构稳定且具有较好的污泥沉降性和生物活性;平均重量污泥浓度从1 189 mg/L增加到1 760 mg/L,SVI值在95 mL/gMLSS以下,反硝化聚磷菌(DNPAOs)占聚磷菌(PAOs)的百分比从接种污泥时的10.87%增加到25.46%。启动过程,COD的去除效果基本稳定,A2/O反应器可实现碳源的高效利用;硝化过程为反硝化除磷提供电子受体,TN的高效去除需要建立在NH4+-N氧化完全的基础上;PO43--P的去除特性与NO3--N的变化密切相关,除了缺氧区的同步脱氮除磷,好氧吸磷对稳定PO43--P出水浓度发挥着重要作用。在平均进水碳氮比为3.44的运行条件下,A2/O+MBBR系统可实现有机物、氮、磷等污染物的同步高效去除,稳定运行阶段出水COD、NH4+-N、TN和PO43--P浓度分别为38.5、1.15、14.2、0.15 mg/L,COD、TN和PO43--P去除率分别为82.23%,74.72%和96.80%。DO、pH和ORP等实时控制参数的变化规律与脱氮除磷存在定量关系,稳定运行阶段厌氧区ORP为-398~-336 mV,反硝化过程pH值增幅0.55,ORP增加到-300~-175 mV,硝化过程pH值降低0.37。ORP、pH值可以直观地反映反硝化过程,pH值能够灵敏地反映硝化进程,实时控制参数的联合调控有利于促进系统的快速启动和稳定运行。
Abstract:A two-sludge system of A2/O+moving bed biofilm reactor (A2/O+MBBR),used to treat wastewater with low carbon/nitrogen (C/N) ratio,was applied to investigate the sludge characteristics and denitrifying phosphorus removal characteristics during the start-up process,and rapid start-up strategy of the system was established based on the metabolic mechanism of nitrogen and phosphorus removals.The results showed that the start-up process was completed by 21 d,the sludge structure was stable with promising sludge settleability and biological activity.The average sludge concentration increased from 1 189 mg/L to 1 760 mg/L,SVI value was below 95 mL/gMLSS,and the percentage of denitrifying phosphorus accumulating organisms (DNPAOs) accounted for phosphorus accumulating organisms (PAOs) increased from 10.87% in inoculation sludge to 25.46%.During the start-up process,COD removal was basically stable and A2/O reactor achieved the efficient utilization of carbon sources.Nitrification process provided electron acceptors for denitrifying phosphorusremoval,and the high-efficiency removal of TN should build on the complete NH4-N oxidation.A close correlation between NO3--N and PO43--P removals was revealed.In addition to the simultaneous nitrogen and phosphorus removals in anoxic zone,aerobic phosphorus absorption played an important role in keeping stable effluent PO43--P under the operation condition with average influent C/N ratio of 3.44,COD,TN and PO43--P removals reached to 82.23%,74.72% and 96.80%,respectively,and the effluent concentrations of COD,NH4+-N,TN and PO43--P were 38.5,1.15,14.2,0.15 mg/L during the stable operation stage,which showed that the A2/O+MBBR system achieved high-efficient removals of organic matter,nitrogen and phosphorus simultaneously.Where.The variations of real-time control parameters of DO,pH and ORP exhibited quantitative relationship with nitrogen and phosphorus removals.During the stable operation,anaerobic ORP value was -398~-336 mV,pH increased by 0.55 and ORP increased to -300~-175 mV in denitrification process,and pH decreased by 0.37 in nitrification process.ORP and pH intuitively reflected the denitrification process,and pH sensitively revealed the nitrification process.Real-time control parameters were beneficial to promote the rapid start-up and stable operation.
文章编号:201601151     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(51578014);北京市教委资助项目;扬州大学科研启动项目
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引用文本:
张淼,何成达,王淑莹,张建华,吴军,彭永臻.A2/O+MBBR系统的快速启动及反硝化除磷特性[J].工程科学与技术,2017,49(2):240-247.
ZHANG Miao,HE Chengda,WANG Shuying,ZHANG Jianhua,WU Jun,PENG Yongzhen.Rapid Start-up and Denitrifying Phosphorus Removal Characteristics of A2/O+MBBR Process[J].Advanced Engineering Sciences,2017,49(2):240-247.