ZHANG Miao,LI Wen-tao,LIAN Jun-feng,et al.UV/Chlorination Process for the Removal of Organics in High Salinity Wastewater from Coal Chemical Industry[J].China Water & Wastewater,2021,37(21 21):82-88.
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UV/Chlorination Process for the Removal of Organics in High Salinity Wastewater from Coal Chemical Industry

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 21 21 Page: 82-88 Column: Date of publication: 2021-11-01
Author(s):
ZHANG Miao1; 2; LI Wen-tao1; LIAN Jun-feng2; ZHAN Lu-meng1; QIANG Zhi-min1; WANG Hui3
(1. Key Laboratory of Drinking Water Science and Technology， Research Center for EcoEnvironmental Sciences， Chinese Academy of Sciences, Beijing 100085， China； 2. School of Civil and Surveying ＆ Mapping Engineering， Jiangxi University of Science and Technology， Ganzhou 341000， China； 3. SINOPEC Research Institute of Petroleum Processing， Beijing 100083, China)
Keywords:
UV/chlorine; high salinity wastewater from coal chemical industry; residual chlorine; COD; biodegradability
Abstract:
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 6 000 mJ/cm2), respectively, the removal efficiencies of COD, DOC and UV254 in the wastewater reached 91.7%, 52.3% and 69.8%, respectively. The UV/chlorination process could increase the BOD5 and BOD5/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.
Last Update: 2021-11-01