A2/O+MBBR系统的快速启动及反硝化除磷特性
Rapid Start-up and Denitrifying Phosphorus Removal Characteristics of A<sup>2</sup>/O+MBBR Process
作者：张淼(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;扬州大学 环境科学与工程学院, 江苏 扬州 225127)；何成达(扬州大学 环境科学与工程学院, 江苏 扬州 225127)；王淑莹(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)；张建华(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)；吴军(扬州大学 环境科学与工程学院, 江苏 扬州 225127)；彭永臻(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)
Author：ZHANG Miao(National Eng. Lab. for Advanced Municipal Wastewater Treatment and Reuse Technol., Eng. Research Center of Beijing, Beijing Univ. of Technol., Beijing 100124, China;College of Environmental Sci. and Eng., Yangzhou Univ., Yangzhou 225127, China)；HE Chengda(College of Environmental Sci. and Eng., Yangzhou Univ., Yangzhou 225127, China)；WANG Shuying(National Eng. Lab. for Advanced Municipal Wastewater Treatment and Reuse Technol., Eng. Research Center of Beijing, Beijing Univ. of Technol., Beijing 100124, China)；ZHANG Jianhua(National Eng. Lab. for Advanced Municipal Wastewater Treatment and Reuse Technol., Eng. Research Center of Beijing, Beijing Univ. of Technol., Beijing 100124, China)；WU Jun(College of Environmental Sci. and Eng., Yangzhou Univ., Yangzhou 225127, China)；PENG Yongzhen(National Eng. Lab. for Advanced Municipal Wastewater Treatment and Reuse Technol., Eng. Research Center of Beijing, Beijing Univ. of Technol., Beijing 100124, China)
收稿日期：2016-10-18 年卷（期）页码：2017,49(2):240-247
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：A<sup>2</sup>/O+移动床生物膜反应器;启动;污泥沉降性;反硝化除磷;实时控制参数
Key words：anaerobic anoxic oxic+moving bed biofilm reactor;start-up;sludge settleability;denitrifying phosphorus removal;real-time control parameters
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
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。
英文摘要
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.
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