可用于去除高盐废水中有机污染物的混凝-Fenton氧化联合工艺

Organic pollutant removal from high-salinity wastewater by coagulation-Fenton integrated process

以某环氧树脂生产厂产生的高盐有机废水为对象,对比研究了Fenton、Fenton-混凝、混凝-Fenton等工艺去除废水中有机污染物的效能。考察了Fenton反应中Fe2+、H2O_2投加比、初始pH、反应时间以及混凝反应中混凝剂种类、投加量等参数对处理效果的影响。结果表明:Fenton工艺的最佳条件为亚铁和过氧化氢投加比1∶20,投加量分别为25 mmol·L^(-1)和500 mmol·L^(-1),初始pH 3,反应时间120 min,TOC去除率为62.50%;混凝工艺选择Fe SO_4混凝剂,投加量为300 mg·L^(-1),TOC去除率为23.78%;废水经过Fenton-无混凝剂混凝、Fenton-混凝剂混凝、混凝-一级Fenton氧化和混凝-二级Fenton氧化工艺处理,TOC去除率分别为68.32%、71.51%、80.69%和89.27%。

The removal of organics from high salinity epoxy resin manufacturing wastewater by coagulation and Fenton processes was investigated and compared. The effects of initial pH value,Fenton＇s reagent or coagulant dosage and reaction time on organics removal were investigated during the oxidation and coagulation processes.Results showed that the optimum conditions for Fenton oxidation were obtained at pH = 3 and the mole ratio of Fenton＇s reagent was n（Fe^2 ＋）/n（H2O2） = 1 ∶ 20,Fe2 ＋dosage of 25 mmol · L^-1,and H2O2 dosage of 500mmol·L^-1. The maximum removal efficiency for TOC by Fenton oxidation was 62. 50% after 120 min reaction.The removal efficiency of TOC by coagulation process was 23. 78% with 300 mg·L^-1dosage of Fe SO4. The removal efficiencies of TOC in different Fenton and coagulation integrated processes,namely Fenton-coagulation（without addition of coagulant） process,Fenton-coagulation process,coagulation-Fenton oxidation and coagulation-two staged Fenton oxidation process,were 68. 32%,71. 51%,80. 69% and 89. 27%,respectively.