MBBR在卡鲁塞尔氧化沟提标改造中的应用

Application of MBBR Process in Carrousel Oxidation Ditch Upgrading

北方某卡鲁塞尔氧化沟污水厂采用MBBR进行提标改造,生化系统改造中保持厌氧区停留时间不变,缺氧区停留时间由3.07 h增加到11.34 h,好氧区投加SPR-Ⅱ型悬浮载体,系统末端增加连续流砂滤池。工艺改造后,在进水水质略有提高的情况下,出水COD、NH3-N、TN、TP和SS平均值分别为35、1.1、10.1、0.4和5.1 mg/L,基本达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。其中好氧段有显著的同步硝化反硝化现象,可去除2~5 mg/L的TN;缺氧段内存在明显的反硝化除磷现象,TP去除率达87%。改造后节能降耗明显,电费减少0.095元/m^3,药剂费减少0.299元/m^3,合计减少运行成本0.394元/m^3。

A wastewater treatment plant in the north China was upgraded from Carrousel oxidation ditch to MBBR.The retention time of the anaerobic zone was unchanged during the biochemical system reformation,the retention time of the anoxic zone increased from 3.07 h to 11.34 h.The aerobic zone was added with SPR-Ⅱsuspension carrier,continuous flow sand filter was added to the end of the system.After the retrofitting,the average effluent of COD,ammonia nitrogen,TN,TP and SS reached 35 mg/L,1.1 mg/L,10.1 mg/L,0.4 mg/L and 5.1 mg/L,respectively,which stably met the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).The aerobic zone showed significant simultaneous nitrification and denitrification,which could remove 2-5 mg/L TN.There was significant denitrification and phosphorus removal in the anoxic segment,and the TP removal rate was 87%.After retrofitting,it showed obvious energy and consumption saving.The electricity consumption was reduced by 0.095 yuan/m^3,the dosing consumption was reduced by 0.299 yuan/m^3,and the total operation cost was reduced by 0.394 yuan/m^3.