喷淋-曝气吹脱组合工艺处理岩溶地下水CCl_4污染  

TREATMENT OF CARBON TETRACHLORIDE IN KARST UNDERGROUND WATER BY SPRAY-AERATION COMBINATION PROCESS

作　　者：张双圣[1,2] 刘喜坤 刘汉湖 朱雪强[1] 曹灿灿[1] 刘华秋 庞一鸣 张梦丽 ZHANG Shuang-sheng;LIU Xi-kun;LIU Han-hu;ZHU Xue-qiang;CAO Can-can;LIU Hua-qiu;PANG Yi-ming;ZHANG Meng-li(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China;Xuzhou City Water Resource Administrative Office,Xuzhou 221018,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]徐州市城区水资源管理处,江苏徐州221018

出　　处：《环境工程》2018年第10期5-8,12,共5页Environmental Engineering

基　　金：江苏省水利科技基金(2016056);水体污染控制与治理科技重大专项基金(2015ZX07406005)

摘　　要：针对水体遭受挥发性有机污染事故,设计"喷淋-曝气吹脱"组合处理工艺,并建设岩溶地下水CCl_4污染治理示范工程,进行效能评估。运行结果表明:随着气水比的增大,水体中CCl_4的去除率逐步增大,尾气中CCl_4的质量浓度逐渐减小。在原水ρ(CCl_4)为11.30μg/L条件下,气水比为5.75时,出水可稳定达到GB 5749—2006《生活饮用水卫生标准》限值要求(2μg/L),此时尾气中ρ(CCl_4)为0.672 mg/m^3,远低于GB 31571—2015《石油化学工业污染物排放标准》规定的CCl_4排放限值(20 mg/m^3);CCl_4去除率与气水比的关系符合Logistic模型,当CCl_4出水ρ(CCl_4)为2μg/L时,气水比为5.48。罗茨风机压缩空气做功,曝气过程中,可能会导致岩溶地下水体发生脱碳酸作用,产生结垢;在保证出水达标的条件下,系统新增直接运行成本为0.058元/m^3。针对现有工艺在运行过程中存在的问题,分析原因,并提出了相应改进措施。Spray-aeration combined process was used to treat volatile organic pollutants in water, and a demonstration project was built to treat carbon tetrachloride in karst underground water. Then the effectiveness of the demonstration project was evaluated. The results showed that, along with the growth of gas-water ratio, the removal rate of CCl4 in the water increased gradually, and the mass concentration of CCl4 decreased gradually in the off-gas. And the effluent quality could meet the limitation requirement of ＂Standards for Drinking Water Quality＂（GB 5749—2006） at the initial concentration of 11.30 μg/L when the gas water ratio was 5.75. Under this condition, the mass concentration of carbon tetrachloride in the off-gas was 0.672 mg/m3, much less than the limitation requirement of＂Emission Standard of Pollutants for Petroleum Chemistry Industry＂（GB 31571—2015）. The relationship between the removal rate of CCl4 and the gas-water ratio conformed to the Logistic model. When the gas water ratio was 5.48, the effluent quality of CCl4 could get to 2 μg/L. The scaling phenomenon occurred because of the decarbonization caused by Roots blower compressing air. The new direct operating cost was 0.058 yuan/m3 in the case that water quality met standards. Based on the shortage analysis of the technique, the reasons and the improving measures were presented in this paper.

关 键 词：岩溶地下水 CCL4 喷淋 曝气吹脱 Logistic模型 

分 类 号：X523[环境科学与工程—环境工程]