基于E-H_(2)O_(2)-O_(3)氧化—BAC滤池工艺的印染废水深度处理应用研究

Application of advanced treatment of printing and dyeing wastewater based on E-H_(2)O_(2)-O_(3)-BAC filtration tank process

采用电化学原位合成法制备H_(2)O_(2)(E-H_(2)O_(2))并耦合O_(3)形成了E-H_(2)O_(2)-O_(3)高级氧化技术,并以该技术为核心,采用E-H_(2)O_(2)-O_(3)氧化—BAC(生物活性炭)滤池工艺在中试条件下对印染废水生化出水进行深度处理。E-H_(2)O_(2)-O_(3)氧化的最优工艺参数为O_(3)通入量120 g/h、H_(2)O_(2)浓度0.63 mmol/L、HRT 2.0 h。中试装置在该条件下连续运行31 d(BAC接触时间40 min),COD、UV_(254)、色度的平均去除率分别达56.4%,89.5%,89.3%,运行成本约为3.35元/t(以废水计)。当进水COD小于90 mg/L时,出水COD低于40 mg/L,达到地表水Ⅴ类排放标准。经E-H_(2)O_(2)-O_(3)氧化—BAC滤池工艺处理后,氧化出水和BAC出水的总荧光强度较进水分别下降了92.0%和96.3%。

The electrochemical in-situ synthesis method was used to prepare H_(2)O_(2)(E-H_(2)O_(2))and make it couple with O_(3)to form the E-H_(2)O_(2)-O_(3)advanced oxidation technology.This core technology was used to perform advanced treatment on the biochemical effluent of printing and dyeing wastewater in a pilot plant under the conditions of the E-H_(2)O_(2)-O_(3)oxidation-biological activated carbon(BAC)filtration tank process.The optimal process parameters of the E-H_(2)O_(2)-O_(3)oxidation were 120 g/h of O_(3)flux,0.63 mmol/L of H_(2)O_(2)concentration,and hydraulic retention time(HRT)of 2.0 h.The pilot plant was operated continuously for 31 d under the process conditions(BAC contact time of 40 min),and the average removal rate of COD,UV_(254),and chromaticity reached 56.4%,89.5%,and 89.3%.The operating cost was about 3.35 yuan/t(calculated as wastewater).When the COD in the influent was less than 90 mg/L,the COD in the effluentwas less than 40 mg/L,which met the class V discharge standard of surface water.The total fluorescence intensity of the oxidized effluent and BAC effluent decreased by 92.0%and 96.3%,respectively,compared with the influent after treatment by the E-H_(2)O_(2)-O_(3)oxidation-BAC filtration tank process.