摘要
西安某污水处理厂设计规模为2×10 5 m3/d,原处理工艺为"粗细格栅及旋流沉砂池预处理+厌氧-缺氧-好氧(AAO)生化池+高密度沉淀池+精密过滤器+氯消毒接触池",原出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918-2002)的一级A标准.为了符合《西安市城镇污水处理厂再生水化提标改造和加盖除臭工程三年行动方案(2018-2020年)》的出水要求,采用移动床生物反应器(MBBR)+反硝化深床滤池工艺对污水厂进行升级改造.该工艺最大限度的利用了现有池体,并在不停水的前提下完成了提标改造,提标总投资为26 976.01万元,提标运行后吨水运行成本增加0.105元,其中电费为0.056元(生物池为0.03元,深度处理为0.026元),药剂费用为0.049元(乙酸钠碳源费为0.045元,聚合氯化铝(PAC)费用为 0.004 元).改造完成后出水 CODCr、BOD5、SS、氨氮、TN 及 TP 出水水质分别为 14.82～19.81、0.6～3.7、3.91～7.13、0.07～0.21、5.70～10.20 mg/L 及 0.13～0.21 mg/L.改造后 CODCr、BOD5、SS、氨氮、TN 及 TP 的整体平均去除率分别为 97.13％、99.08％、98.98％、99.63％、85.54％及97.75％.冬季氨氮及TN的出水稳定达标.此改造案例可为北方寒冷地区污水厂提标改造提供参考.
Abstract
The design scale of a wastewater treatment plant(WWTP)in Xi'an is 2×10 5m3/d.The original treatment process is"pre-treatment of coarse and fine grids and swirling sedimentation tanks+anaerobic/anoxic/aerobic(AAO)biochemical tank+high-density sedimentation tank+precision filter+contact disinfection tank".The effluent quality meets the class A standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).In order to meet the effluent requirements of the Three-Year Action Plan for the Renewal and Upgrading of the Reclaimed Water Treatment and Capacity Expansion Project of Xi'an Municipal Wastewater Treatment Plant(2018-2020),WWTP is upgraded using the movingbed bio reactor(MBBR)+denitrification deep-bed filter process.This process maximizes the use of existing tanks and achieves the upgrading without stopping the water supply.The total investment for the upgrading is 269.760 1 million yuan,after the standard lifting operation,the operating cost per ton of water increased by 0.105 yuan,including 0.056 yuan for electricity(biological pool is 0.03 yuan,deep processing is 0.026 yuan)and 0.049 yuan for chemicals(sodium acetate carbon source fee is 0.045 yuan,PAC fee is 0.004 yuan).After the reconstruction,CODCr,BOD5,SS,ammonia nitrogen,TN and TP of effluent quality are from 14.82 mg/L to 19.81 mg/L,0.6 mg/L to 3.7 mg/L,3.91 mg/L to 7.13 mg/L,0.07 mg/L to 0.21 mg/L,5.70 mg/L to 10.20 mg/L and 0.13 mg/L to 0.21 mg/L,respectively.The overall average removal rates of CODCr,BOD5,SS,ammonia nitrogen,TN and TP after reconstruction are 97.13％,99.08％,98.98％,99.63％,85.54％and 97.75％,respectively.The effluent of ammonia nitrogen and TN in winter meets stable standards.This reconstruction case can provide reference for the upgrading and reconstructing of WWTP in cold northern regions.
维普
万方数据