UV-Fenton工艺对垃圾渗滤液纳滤浓缩液的处理效果及影响因素研究

Study on UV-Fenton Treatment of Concentrated Water from Nanofiltration of Bio-treated Landfill Leachate

采用UV-Fenton工艺对垃圾渗滤液的纳滤浓缩液进行处理,考察了该工艺对难降解有机污染物的处理效果,并研究了H2O2投加量、FeSO4·7H2O投加量、pH、温度和反应时间等因素对纳滤浓缩液处理效果的影响。结果表明,UV-Fenton工艺能有效去除浓缩液中的有机污染物。TOC去除率随着H2O2和FeSO4·7H2O投加量的增加而升高,当H2O2投加量从1665mg/L增加至13320mg/L时,TOC去除率从53.3%上升至69.8%;当FeSO4·7H2O投加量从367mg/L增加至5500mg/L时,TOC去除率从57.4%上升至71.7%;该工艺对pH具有缓冲性,在初始pH为2.0～6.0时,TOC去除率受pH的影响较小;随着初始温度从20℃升至60℃,TOC去除率小幅下降;TOC去除率在反应开始的30min内上升较快,之后增加趋势减缓。TOC去除率在反应2h后基本不再上升。

The treatment effect of concentrated water from nanofiltration of bio-treated landfill leachate was investigated through UV-Fenton process, and different factors on TOC removal such as H2O2 dosage, ferrous salt dosage, pH, temperature and reaction time were also studied. The results showed that UV-Fenton process could effectively remove the organic pollutant components. The H2O2 and FeSO4＋ 7H2O dosage had a significant effect on TOC removal. The removal rate increased from 53.3% to 69.8% with H2O2 dosage increasing from 1 665 mg/L to 13 320 mg/L, and increased from 57.4% to 71.7% with FeSO4 · 7H2O dosage increasing from 367 mg/L to 5 500 mg/L. UV-Fenton system had a buffer effect on pH variation, and removal rate had a minor change with initial pH ranging from 2.0 to 6.0. With the temperature increasing from 20 to 60 ℃, TOC removal rate decreased slowly. TOC removal rate had a sharp increase in first 30 min and increased slowly later and, after 2 h, TOC removal rate no longer increased basically.