县级市政污水处理厂提标改造探究与应用OACSTPCD

To further promote the quality of the regional water environment,based on the existing process of municipal wastewater treatment plants(WWTPs),this paper delves into tapping the potential of process segments and minimizes the land occupation for expansion to upgrade the municipal sewage treatment plants in key environmentally sensitive areas of a certain county from the original grade A standard to the Discharge Standard of Major Water Pollutants for Municipal Wastewater Treatment Plant(DB33/2169-2018)in Zhejiang Province.Taking two municipal WWTPs in a certain county as examples,the concept of cost reduction and efficiency increase by optimizing operation before taking engineering measures,and in-situ standard upgrading before newly building and upgrading is advocated.The process operation,energy consumption,floor area,and investment cost per ton of water are deeply analyzed.The average removal rates of chemical oxygen demand(CODCr),ammonia nitrogen,and total nitrogen(TN)after the upgrading and reconstruction of phase Ⅰ and phase Ⅱ of WWTP A are 93.29％,95.53％,and 76.73％,respectively.The average removal rates of CODCr,ammonia nitrogen,and TN after the phase Ⅲ of upgrading are 96.05％,98.11％,and 73.18％,respectively.The average removal rates of CODCr,ammonia nitrogen,and TN after the upgrading and renovation of WWTP B are 96.76％,96.27％,and 87.44％,respectively.Finally,the effluent quality of the two WWTPs can stably reach the DB33/2169-2018 of emission standards in table two.This engineering case can provide reference for the upgrading and reconstruction of WWTPs of other county-level water companies.