改良氧化沟工艺启动调试及脱氮除磷优化控制  

Start-up Commissioning of Modified Oxidation Ditch Process and Optimal Control of Its Nitrogen and Phosphorus Removal

作　　者：刘坤 王新冀 张念东 罗艳丽[1] LIU Kun;WANG Xin-ji;ZHANG Nian-dong;LUO Yan-li(College of Grassland and Environment Sciences,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Huafeng Environment Protection Engineering Co.Ltd.,Urumqi 830000,China)

机构地区：[1]新疆农业大学草业与环境科学学院,新疆乌鲁木齐830052 [2]新疆华峰环保工程有限公司,新疆乌鲁木齐830000

出　　处：《中国给水排水》2022年第2期116-121,共6页China Water & Wastewater

摘　　要：乌鲁木齐市达坂城区第二污水处理厂采用改良Carrousel 2000氧化沟工艺。针对调试期间发生的污泥上浮及出水TN、TP超标问题,通过检测主要水质指标和微生物镜检,结合污水处理厂的工艺运行参数,找到该问题的原因:污泥龄过长、曝气量过大引起氧化沟内污泥老化上浮;没有及时补充碱度和碳源、缺氧段DO过高导致反硝化过程无法正常进行而使脱氮效果不佳,同时引起二沉池污泥发生反硝化上浮;污泥龄过长是除磷效果不佳的主要原因。对相关运行参数进行调整,通过2个月的试运行,虽然该污水厂进水量少、水质波动较大,但系统出水各项指标均达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准,对COD、TP、TN、NH_(4)^(+)-N、SS的去除率分别达到96.7%、98.5%、92.4%、99.3%、96.5%。The modified Carrousel 2000 oxidation ditch process is adopted in the second sewage treatment plant in Dabancheng District,Urumqi.The causes to problems of sludge floating and effluent TN and TP exceeding standard during commissioning are found out through testing the main water quality indicators and microbiological microscopic inspections,in combination with the process operating parameters of the sewage treatment plant.They include sludge aging and floating in the oxidation ditch caused by excessive sludge age and aeration amount,the denitrification failure and accompanied sludge floating in the secondary sedimentation tank caused by high DO in anoxic section if alkalinity and carbon source are not supplemented in time,and poor dephosphorization effect caused by excessive sludge age After two months of trial operation to adjust the relevant operating parameters,although the influent water volume was small and the water quality fluctuated greatly,the various effluent indicators could stably meet the first level A criteria of Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002).The removal rates of COD,TP,TN,NH_(4)^(+)-N and SS reached 96.7%98.5%,92.4%,99.3%,96.5%,respectively.

关 键 词：改良Carrousel 2000氧化沟 启动调试 污泥上浮 试运行 

分 类 号：TU992[建筑科学—市政工程]