臭氧-混凝交互作用对水体有机物的影响  

Effects of Joint-reaction Combined by Ozonation and Coagulation on Aquatic Organic Matters

作　　者：刘海龙[1] 付晶淼 郭雪峰[1] 柴建恬 张忠民[2] 

机构地区：[1]山西大学环境与资源学院,太原030006 [2]太原市环境监测中心站,太原030002

出　　处：《环境科学》2017年第5期1918-1927,共10页Environmental Science

基　　金：国家自然科学基金项目(51179099/E090301);山西省科技攻关项目(20110321021-01;20140313003-3);山西省重点研发计划项目(201603D321007);山西省留学回国人员科技活动择优资助项目(2014);山西省回国留学人员科研资助项目(2015-004)

摘　　要：研究臭氧在纯水和混凝剂[Al_2(SO_4)_3]溶液中残余浓度的变化;采用差异吸收分析(differential absorbance,DA)、三维荧光(three dimensional fluorescence excitation-emission matrix spectroscopy,3D-EEM)和气相色谱(gas chromatograph,GC)、总有机碳分析(total organic carbon analyser,TOC)等研究水体有机物(富里酸)光谱特征、有机物和消毒副产物(DBPs)生成量在预臭氧、预臭氧-混凝(POC)以及臭氧-混凝联用(OC)后的差异;研究臭氧和混凝联合作用对有机物氧化程度及其对DBPs生成的影响.结果表明POC与OC作用存在明显差别,臭氧与混凝剂Al_2(SO_4)_3存在交互作用.交互作用主要体现在:(1)臭氧-混凝联用时臭氧降解速率加快;且臭氧降解中自由基产量相对增加.当臭氧投量2 mg·L^(-1),Al3+含量为1 mg·L^(-1)、3 mg·L^(-1)时,自由基捕获量比单独臭氧分别高15.2%和23.9%.(2)联用和预臭氧-混凝对有机物反应的差异,体现在OC有机物去除率低于POC,二者对有机物的反应途径不同;进而导致有机物与消毒剂反应的差异以及DBPs生成的差异.联用对DOC的去除能力明显强于单独臭氧和单独混凝,但弱于预氧化-混凝.当O3浓度为1 mg·L^(-1)、Al3+1 mg·L^(-1)时POC处理后二氯乙酸生成势(DCAAFP)和三氯乙酸生成势(TCAAFP)分别为47μg·L^(-1)和20.5μg·L^(-1),三氯甲烷生成势(CFFP)为97.8μg·L^(-1),较原水分别降低51%、64.6%和41.5%;而相应臭氧-混凝处理后DCAAFP和TCAAFP分别为48.4μg·L^(-1)和21.4μg·L^(-1),CFFP为117.3μg·L^(-1);较原水分别降低49.6%、63%和29.5%.同等臭氧投量下,增加混凝剂的剂量,POC和OC处理效果的差异进一步扩大.为保证用水安全和处理效率,臭氧和混凝联用时对臭氧的浓度、投加位置、混凝剂的种类等都需要进一步的研究论证,慎重选择.Variations of residual ozone concentration in pure water and Al2（SO4）3 solution were studied. The spectral characteristics,contents of organic compounds and disinfection by products（DBPs） yields in preozonated,preozonated coagulated（POC） and ozonated combined coagulated（OC） waters were detected by differential absorbance（DA）,three dimensional fluorescence excitationemission matrix spectroscopy（3D-EEM）,GC and TOC. The purpose of the work was to investigate the effects of ozonation combined with coagulation on their oxidation extents of organic matter and the production of DBPs. Studies showed that there were remarkable differences between the two processes,POC and OC,which proved the existence of joint interaction of ozone and coagulant. The joint interaction involved the following aspects.（1） Decomposition rate of ozone was improved; and the free radical production was increased during OC compared with POC. Comparing to ozone alone,15. 2% and 23. 9% more radical capture with ozone 2 mg·L^-1,Al^3 ＋1mg·L^-1,3 mg·L^-1were detected.（2） The difference of OC and POC was found in that organic matter removal of OC was lower than that of POC. The pathways of OC and POC showed difference,which resulted in differences of reaction between organic matter and disinfectant,as well as yields of DBPs. OC removed UV254 and DOC more efficiently than single ozonation or single coagulation; but less efficiently than POC. DCAAFP（Dichloroacetic acid formation potential） and TCAAFP（Trichloroacetic acid formation potential）were 47 μg·L^-1and 20. 5 μg·L^-1respectively after treatment by POC with O31 mg·L^-1and Al^3 ＋1 mg·L^-1,and chloroform formation potential（CFFP） was 97. 8 μg·L^-1,which were 51%,64. 6% and 41. 5% respectively lower than those in the raw water. Under the same dose conditions,DCAAFP,TCAAFP and CFFP after OC were 48. 4 μg·L^-1,21. 4 μg·L^-1and 117. 3 μg·L^-1,respectively,which were 49. 6%,63% and 29. 5% lower than those in raw water. The difference between t

关 键 词：臭氧 预臭氧 混凝 消毒副产物 三维荧光 

分 类 号：X131.2[环境科学与工程—环境科学]