臭氧降解垃圾渗滤液膜滤浓缩液的影响因素及光谱特性
Degradation of Leachate Concentrate Using Ozone: Influencing Factors and Spectral Characteristics
投稿时间:2017-03-14  修订日期:2017-09-16
中文关键词:臭氧  垃圾渗滤液浓缩液  降解  光谱特性
英文关键词:ozone  landfill leachate concentrate  degradation  spectral characteristics
基金项目:四川师范大学自制试验教学仪器设备(软件)项目(ZZYQ2016-04);四川师范大学创新创业教育课程(2015-14)
作者单位E-mail
李民 四川师范大学 化学与材料科学学院 成都 610068 798749991@qq.com 
陈叶萍 四川师范大学 化学与材料科学学院 成都 610068 1411730520@qq.com 
张莎 四川师范大学 化学与材料科学学院 成都 610068 1847581310@qq.com 
冯宇 四川师范大学 化学与材料科学学院 成都 610068 910261687@qq.com 
陈宇芸 四川师范大学 化学与材料科学学院 成都 610068 910261687@qq.com 
张爱平 四川师范大学 化学与材料科学学院 成都 610068 910261687@qq.com 
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中文摘要:
      研究臭氧氧化对垃圾渗滤液浓缩液中有机物去除机制,为臭氧氧化技术处理腐殖化程度较高的垃圾渗滤液膜滤浓缩液的应用提供基础数据与技术支撑。垃圾渗滤液处理工艺为A2/O + MBR + NF(RO),渗滤液浓缩液表观呈棕黄色,无恶臭; pH值7.98,CODCr5492mg/L,BOD5/CODCr值0.01,荧光指数f(450/500) 1.45,生物源指数BIX为0.81,腐殖化指数HIX 14.95。研究反应时间、臭氧投量、进水CODCr浓度、初始pH值、反应温度等因素对渗滤液浓缩液中有机物去除机制及其光谱特性。结果表明:在反应时间为90 min、臭氧投量为1.67 g/h和室温为27℃的条件下,CODCr和CN(色度)去除率分别为37.6%、58.0%,BOD5/CODCr从0.01提升到0.39;增加反应时间、臭氧投量和反应温度可促进渗滤液浓缩液的降解,而降低体系CODCr浓度和pH值则不利于腐殖质类物质的削减;紫外-可见光谱表明臭氧处理过程可极大程度改变废水的腐殖化程度,芳香物质去除较为明显;三维荧光光谱表明臭氧可有效降解浓缩液中的可见光区类富里酸,且经臭氧处理后的渗滤液浓缩液分子结构趋于简单。
英文摘要:
      In this study, we investigated the mechanism of organic contaminant removal in landfill concentrated leachate by ozonation technology, and the influence of reaction time, ozone dosage, initial COD concentration, initial pH and reaction temperature on removal efficiency. The reaction of humates in the leachate during the treatment process was studied using UV-visible and three-dimensional fluorescence spectroscopy. The study provides basic data and technological support for applying ozonation to treat humified wastes. The concentrated leachate for the experiment was brownish yellow, odorless, pH of 7.98, CODCr of 5492mg/L,BOD5/CODCr of 0.01, fluorescence index (f450/500) of 1.45, biogenic index (BIX) of 0.81 and humification index (HIX ) of 14.95. The treatment process of the leachate was A2/O + MBR + NF (RO) and treatment was carried out under different conditions by varying the following factors: reaction time (10, 30, 60, 90, 120, 180min); ozone dosing rates (0.67, 1.00, 1.33, 1.67g/h); initial COD concentration (undiluted leachate and diluted leachate with dilution factors of 1, 2, 4, 8), initial pH (3.01, 4.95, 6.99, 7.98, 8.5, 8.99, 9.99), and reaction temperature (27, 35, 38, 46℃) . The removal rate of COD and color were 37.6% and 58.0%, respectively, and the BOD/COD ratio increased from 0.01 to 0.39 when the system was operated under the most favorable conditions (reaction time, 90 min; ozone dosing rate, 1.67g/h; initial COD, 5492mg/L; initial pH, 7.98; reaction temperature, 27 °C). Increasing reaction time, ozone dosage and reaction temperature increased leachate degradation, while decreasing initial COD concentration and pH decreased reduction of humic substances. Furthermore, UV-Vis spectra analysis indicated that ozone treatment greatly decreased the degree of humification and aromatic compounds were effectively removed. Analysis of 3D-EEM spectra showed that ozone rapidly oxidizes the structurally stable fulvic acid-like organic matter in the leachate, transforming these substances to smaller, simpler structures that are more easily disposed of with further treatment.
李民,陈叶萍,张莎,冯宇,陈宇芸,张爱平.2017.臭氧降解垃圾渗滤液膜滤浓缩液的影响因素及光谱特性[J].水生态学杂志,38(5):21-28.
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