摘要
采用紫外/氯高级氧化工艺处理煤化工高盐废水,探讨了不同投氯量对废水中有机物去除率的影响,并分析了氧化前后紫外吸收、荧光特性和可生化性的变化。首先率定了余氯对COD测试方法的影响,发现了与氯离子影响不同的线性负干扰。结果表明,单独紫外或单独加氯对COD或DOC的作用较小,而紫外/氯工艺对有机物的去除效果显著。在投氯量为240 mg/L、紫外辐照时间为25 min(对应紫外剂量为6000 mJ/cm^(2))条件下,对COD、DOC和UV_(254)的去除率分别达到91.7%、52.3%和69.8%。紫外/氯工艺可以提高废水的BOD_(5)及BOD_(5)/COD值,说明该工艺不会导致出水生物毒性的增加,且废水中的难生物降解有机物可转变为生物降解性良好的物质。单位能耗分析结果表明,增加投氯量可以降低紫外/氯工艺去除单位质量COD的成本。
An UV/chlorination advanced oxidation process was employed to treat the high salinity wastewater from coal chemical industry.The effects of different chlorine dosages on the removal of organic matters in the wastewater were investigated,and the variations in ultraviolet absorption,fluorescence characteristics and biodegradability of the wastewater before and after oxidation were analyzed.The influence of residual chlorine on COD testing method was firstly determined,and the linear negative interference different from the influence of chloride ion was found.The UV irradiation or chlorination had little effect on the removal of the COD or DOC in the wastewater,while UV/chlorine process had a significant removal effect on the organic matters.When the chlorine dosage and UV irradiation time were 240 mg/L and 25 min(the corresponding UV dose was 6000 mJ/cm^(2)),respectively,the removal efficiencies of COD,DOC and UV_(254) in the wastewater reached 91.7%,52.3%and 69.8%,respectively.The UV/chlorination process could increase the BOD_(5) and BOD_(5)/COD value of the wastewater,indicating that the process did not lead to the increase of the biotoxicity of the effluent,and the refractory organic matters in the wastewater could be transformed into easily biodegradable substances.The specific energy consumption analysis showed that the cost of removing unit COD by the UV/chlorination process could be reduced by increasing the chlorine dosage.
作者
张淼
李文涛
连军锋
詹露梦
强志民
王辉
ZHANG Miao;LI Wen-tao;LIAN Jun-feng;ZHAN Lu-meng;QIANG Zhi-min;WANG Hui(Key Laboratory of Drinking Water Science and Technology,Research Center for EcoEnvironmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;SINOPEC Research Institute of Petroleum Processing,Beijing 100083,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2021年第21期82-88,共7页
China Water & Wastewater
基金
中国石化股份公司项目(31921-6)
国家自然科学基金资助项目(51908536)。
关键词
紫外/氯
煤化工高盐废水
余氯
COD
可生化性
UV/chlorine
high salinity wastewater from coal chemical industry
residual chlorine
COD
biodegradability
