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混凝联合O₃、O₃/UV深度处理焦化废水的研究

Advanced Treatment of Coke Plant Wastewater by Coagulation Combined with O₃ or O₃/UV

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【Author】 LEI Ting1,ZHAO Wen-tao2,3,HUANG Xia2,3,WANG Xiao-chang1(1.School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;2.State Key Joint Laboratory of Environmental Simulation and Pollution Control,Tsinghua University,Beijing 100084,China;3.Department of Environmental Science and Engineering,Tsinghua University,Beijing 100084,China)

【机构】西安建筑科技大学环境与市政工程学院；清华大学环境模拟与污染控制国家重点联合实验室；清华大学环境科学与工程系；

【摘要】采用混凝联合O3、O3/UV深度处理焦化废水的生物处理出水。试验结果表明:当混凝剂Al2(SO4)3的投量为900 mg/L时,对TOC、COD、色度和UV254的去除率分别为23.2%、19.5%、33.6%和27.1%,相应的出水值分别为55.5 mg/L、196 mg/L、680倍和2.53 cm-1。混凝出水经O3/UV深度处理的效果优于单独O3氧化的,当臭氧投量为2.8 g/L、反应时间为80 min、UV照射强度为30 W时,对TOC、COD、色度和UV254的去除率分别达到91.8%、73.1%、96.1%和97.6%,相应的出水值分别为5.9 mg/L、60 mg/L、40倍和0.081 cm-1,出水COD浓度达到《污水综合排放标准》(GB 8978—1996)的一级标准,且大大提高了废水的可生化性。更多还原

【Abstract】 The treatment effect of bio-treated coke plant wastewater using coagulation combined with O3 or O3/UV was investigated.The experimental results indicate that when coagulant Al2(SO4)3 dosage is 900 mg/L,the removal rates of TOC,COD,color and UV254 are 23.2%,19.5%,33.6% and 27.1% respectively,and their values in the effluent are 55.5 mg/L,196 mg/L,680 times and 2.53 cm-1 respectively.O3/UV after coagulation is more efficient in removing pollutants than O3.When the ozone dosage is 2.8 g/L,the reaction time is 80 min and UV irradiation intensity is 30 W,the removal rates of TOC,COD,color and UV254 are 91.8%,73.1%,96.1% and 97.6% respectively,and their values in the effluent are 5.9 mg/L,60 mg/L,40 times and 0.081 cm-1 respectively.The effluent COD concentration meets the first criteria specified in Integrated Wastewater Discharge Standard(GB 8978-1996).The goal of improving wastewater biodegradability is achieved.更多还原