水生态学杂志2017，Vol.38Issue(5)：21-28,8.DOI:10.15928/j.1674-3075.2017.05.004
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
摘要
Abstract
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, ini-tial 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 ex-periment was brownish yellow, odorless, pH of 7. 98, CODCr of 5492 mg/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 treat-ment 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 , 180 min ); ozone dosing rates ( 0. 67 , 1. 00, 1. 33, 1. 67 g/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. 67 g/h;initial COD, 5492 mg/L;initial pH, 7. 98;reaction temperature, 27℃). 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 or-ganic matter in the leachate, transforming these substances to smaller, simpler structures that are more easily dis-posed of with further treatment.关键词
臭氧/垃圾渗滤液浓缩液/降解/光谱特性Key words
ozone/landfill leachate concentrate/degradation/spectral characteristics分类
资源环境引用本文复制引用
李民,陈叶萍,张莎,冯宇,陈宇芸,张爱平..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,2017,38(5):21-28,8.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) （软件）
四川师范大学创新创业教育课程(2015-14). （2015-14）
