O3/H2O2降解垃圾渗滤液浓缩液的氧化特性及光谱解析  

Decomposition of organics in concentrated landfill leachate with ozone/hydrogen peroxide system:Oxidation characteristics and Spectroscopic analyses

作　　者：陈炜鸣 张爱平[2] 李民[2] 蒋国斌[1] 李启彬[1,2] LI Qi-bin;ZHANG Ai-ping;LI Min;CHEN Wei-ming;JIANG Guo-bin(Geosciences and Environmental Engineering of Southwest Jiaotong University, Chengdu 611756, P, R.China;Key Laboratory of Special Waste Water Treatment, Sichuan Province Higher Education System, College of Chemistry and Material Science, Sichuan Normal University, Chengdu 610068, China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756 [2]四川省高校特种废水处理重点实验室,四川师范大学化学与材料科学学院,四川成都610068

出　　处：《中国环境科学》2017年第6期2160-2172,共13页China Environmental Science

基　　金：四川省高校特种废水处理重点实验室开放课题(SWWT2015-4);四川省科技厅苗子工程项目(2015039)

摘　　要：利用臭氧协同双氧水技术对垃圾渗滤液膜滤浓缩液进行预处理,通过有机物的去除率、氧化还原电位、降解速率、总碱度、可生化性及分子量分布探讨了其有机物的氧化特性,并采用光谱表征手段探讨了废水中DOM在臭氧化过程的分子变化.结果表明,添加4m L/L双氧水能显著提升对其有机污染物的去除,较单独臭氧作用其COD、UV_(254)、色度CN的去除率分别提升了11.01%、12.92%和10.74%,降解速率由小到大依次为COD、V_(254)和CN,其生色团最易被臭氧攻击降解;废水的可生化性得到改善,BOD_5/COD值可达0.43,且大分子量的腐植酸和富里酸被有效的降解为小分子有机化合物.傅里叶红外光谱图表明,臭氧能使腐殖质中官能团如Ar-O等结构完全消失;紫外-可见光谱图表明,臭氧能使废水中有机物的芳香性程度、分子量和缩合度降低,协同氧化后对苯环类化合物的降解效率显著提高;对三维荧光光谱矩阵PARAFAC模型分析可知,渗滤液浓缩液中组分C1为富里酸,组分C2推测为芘及其烷基衍生物,组分C3为长波类腐殖质,其C1和C3组分能较快被氧化,而C2组分的去除效果较C1和C3组分较差.A concentrated leachate from reverse osmosis(RO)was pre-treated with ozone and hydrogen peroxide.Thedegradation rate,ORP,alkalinity(as CaCO3)and molecular weight distribution of the organics were investigated,andmolecular structure changes of DOM were studied using spectroscopic analyses.Compared to the ozone alone treatment,the ozone/hydrogen peroxide treatment was significantly improved with4mL/L H2O2addition.The removal efficienciesof COD,UV254,and CN by11.01%,12.92%,and10.74%,respectively.The degradation rate followed by COD,UV254and CN,and the chromophore was most easily attacked by ozone.In addition,the biodegradability of the wastewater notonly improved effectively but also the ratio of BOD5/COD reached0.43,and the fractions with large molecular weightsuch as HA and FA were efficiently decomposed into fractions with small molecular weight.FT-IR analysis indicatedDOM of wastewater was oxidized gradually and functional groups like Ar-O disappeared completely.UV-Vis spectraanalysis indicated that the humification of the wastewater was greatly deceased by ozone/hydrogen peroxide system,andthe degradation of aromatic compounds was also improved significantly with the system.In addition,PARAFAC analysisof excitation emission matrix(EEM)from fluorescence spectroscopy for different samples indicated that C1and C3werefulvic acid and humic-like substances.C2was identified as pyrene and its alkylderivates.Ozonation oxidized componentsC1and component C3much faster than component C2.

关 键 词：臭氧/双氧水 渗滤液浓缩液 傅里叶红外光谱 紫外-可见光谱 三维荧光光谱 平行因子 

分 类 号：X703.1[环境科学与工程—环境工程]