活性炭滤膜工艺在污水厂提标改造中的应用

Application of activated carbon membrane treatment on upgradingand reconstruction of wastewater treatment plant

为了探讨活性炭滤膜工艺深度处理污水厂出水的实际效果和可行性,构建活性炭滤膜处理设备并开展中试,以分析本工艺对污水厂出水的化学需氧量(chemical oxygen demand,COD_(Cr))和悬浮物(suspended solids,SS)的去除效率,并优化运行条件。结果显示,当活性炭投加量为150 kg时,COD_(Cr)为80~100 mg/L,SS为90~100 mg/L的二沉池出水,本工艺可将其出水COD_(Cr)和SS分别控制在40 mg/L和10 mg/L以下,满足GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准规定的排放限值。此外,根据测算,本中试设备的直接运行成本为0.84元/t,对COD_(Cr)和SS有迫切提高污染物排放标准需求的污水处理厂,采用活性炭滤膜工艺处理二沉池出水在技术上和经济上是可行的。

In order to explore practical effect and feasibility of advanced treatment of activated carbon membrane on wastewater treatment plant outflow,the activated carbon membrane equipment was established and pilot experiments were carried out to analyze its removal efficiency of chemical oxygen demand(COD_(Cr))and suspended solids(SS)of wastewater treatment plant outflow,and optimize operating conditions.The results show that when the loading of activated carbon is 150 kg,the COD_(Cr) concentration reaches below 40 mg/L in the outflow and ranges from 80 to 100 mg/L in the secondary effluent,and the SS concentration reaches below 10 mg/L in the outflow and ranges from 90 to 100 mg/L in the secondary effluent.The quality of ultimate effluent can meet the A class discharge limits specified in the Chinese National Standard GB 18918-2002“Discharge Standard of Pollution for Municipal Wastewater Treatment Plant”.Besides,according to the measurement,the direct operation cost of this pilot system is 0.84 yuan/m 3.As a result,for the wastewater treatment plant with urgent requirements for raising pollutant discharge standard,the activated carbon membrane treatment is technically and economically feasible.