非均相Fenton催化氧化工艺深度处理聚甲醛废水

Advanced treatment of polyoxymethylene wastewater byheterogeneous Fenton catalytic oxidation process

以聚甲醛废水经传统生化工艺处理后的一级好氧出水、二级好氧出水和二沉池出水为研究对象,混凝后采用非均相Fenton催化氧化工艺对其进行深度处理,并与铁碳微电解—均相Fenton氧化组合工艺和传统Fenton氧化工艺对比,考察了3种工艺的COD去除效果、铁泥产量和运行成本。实验结果表明:非均相Fenton催化氧化工艺具有更优的COD去除能力和脱色效果,出水COD为30.1 mg/L,色度为8倍,满足综合回用处理要求(COD<120 mg/L);该工艺几乎不产铁泥,污泥干重仅为0~0.04 kg/m^(3);同时,混凝—非均相Fenton催化氧化工艺具有更低的运行成本,处理二沉池出水的药剂成本为4.56元/t。

With the heterogeneous Fenton catalytic oxidation process as an advanced treatment method,the primary aerobic effluent,secondary aerobic effluent and secondary sedimentation effluent of polyoxymethylene wastewater were treated after coagulation.The COD removal effect,iron sludge production and operating cost of 3 processes of heterogeneous Fenton catalytic oxidation,iron-carbon micro-electrolysis-homogeneous Fenton oxidation and traditional Fenton oxidation were compared.The experimental results show that:The heterogeneous Fenton catalytic oxidation process has higher COD removal rate(30.1 mg/L of effluent COD)and decolorization rate(8 times of effluent chroma),and the water quality of the treated effluent meets the requirements for reuse(COD<120 mg/L);Moreover,the heterogeneous Fenton catalytic oxidation process has little iron sludge production with only 0-0.04 kg/m^(3 ) of sludge dry weight and lower operating cost with 4.56 yuan/t for treatment of the secondary sedimentation effluent.