某高排放标准污水处理厂运行问题与对策措施研究  

Study on Countermeasures and Operational Problems of a WWTP with High Discharge Standard

作　　者：杨敏 郭兴芳 孙永利 郑兴灿 李劢 熊会斌 申世峰 吴凡松 YANG Min;GUO Xing-fang;SUN Yong-li;ZHENG Xing-can;LI Mai;XIONG Hui-bin;SHEN Shi-feng;WU Fan-song(North China Municipal Engineering Design&Research Institute Co.Ltd.,Tianjin 300074,China)

机构地区：[1]中国市政工程华北设计研究总院有限公司,天津300074

出　　处：《中国给水排水》2021年第6期6-10,共5页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07107-003)。

摘　　要：以海河流域采用改良Bardenpho工艺的某高排放标准污水处理厂提标改造工程为例,结合生产运行实际,对工艺诊断的主要运行问题进行了分析,并对其精细化对策措施进行了研究。结果表明,针对内回流混合液与后缺氧池入流DO过高导致外碳源无效损耗及后缺氧池无内源反硝化问题,通过利用池容未利用的好氧段4与好氧段5设置强化消氧区(设计HRT为3.5 h),外碳源损耗控制量(以COD计)可达15.97 mg/L,后缺氧池内源反硝化强化脱氮量可达2.8 mg/L(相当于利用污泥内碳源COD为11.2 mg/L),碳源投加量(以COD计)可降低27.17 mg/L,降幅达54.34%,碳源投加成本可节约5.2万元/d;针对部分时段缺氧池碳源过量投加导致部分好氧池池容(约24%)被占用问题,结合缺氧池设计特征,提出"碳源投加点由缺氧池1后移至缺氧池4并在缺氧池3配置在线硝氮仪"的精细化碳源投加系统及其具体运行控制方法;针对化学协同除磷药剂过量投加导致无生物除磷功能问题,通过采取"化学除磷药剂投加点由二沉池配水井改至磁混凝单元恢复生物除磷功能"的对策措施,生物除磷功能恢复良好,厌氧池磷酸盐由优化前的0.75 mg/L增至7.5 mg/L,好氧池出水磷酸盐低至0.04 mg/L,缺氧池反硝化除磷作用显著(磷酸盐下降2.77 mg/L),并且除磷药剂用量降低70%,投加成本节约0.7万元/d。An upgrading and transformation project of WWTP with high discharge standard in Haihe basin,which used Bardenpho process,was taken as an example in this paper. Combining with actual operation,the main operational problems based on process diagnosis were analyzed,and the refinement countermeasures were studied accordingly. Some methods were taken to solve the problems that invalid loss of external carbon source and no endogenous denitrification effect in later anoxic tank caused by high DO of internal recycling mixed liquid and influent of later anoxic tank,which was to set enhanced biological DO removal zone by utilizing the 4 th and 5 th aerobic phase( HRT of 3. 5 h) with unutilized tank volume. As a result,the quantity of external carbon source loss could be controlled to15. 97 mg/L COD,nitrogen removal ability of later anoxic tank by endogenous denitrification could be enhanced to 2. 8 mg/L TN with utilization of 11. 2 mg/L COD of internal carbon source in sludge,carbon source dosage could be decreased by 27. 17 mg/L COD with decreasing extent of 54. 34%,and carbon source adding cost could be saved 52 000 yuan per day. Aiming at the problem that excessive addition of carbon source in anoxic tank in some period causing 24% of aerobic tank volume to be occupied,combined with the design characteristic of anoxic tank,a fine carbon source feeding system with carbon source addition point from 1 st anoxic tank to 4 th anoxic tank and on-line nitrate meter in the 3 rd anoxic tank and its specific operation control method were proposed. In view of the problem that excessive addition of synergistic chemicals for phosphorus removal caused activated sludge lossing biological phosphorus removal function,by taking the countermeasure that the addition point of chemicals for phosphorus removal was optimized from distributing well of secondary settling tank to coagulation with magnet unit so as to recover biological phosphorus removal function,biological phosphorus removal function could be recovered well. PO34--P of anaerobic

关 键 词：强化消氧区 强化内源反硝化 精细化碳源投加系统 恢复生物除磷 

分 类 号：TU992[建筑科学—市政工程]