Fenton流化床工艺在印染废水深度处理中的工程应用

Dyeing wastewater advanced treatment project by Fenton fluidized bed process

江阴某印染废水末端深度处理工程,设计水量为6000m^3/d,采用Fenton氧化法处理印染废水的二沉池出水。芬顿流化床反应时间为30min,控制反应的pH 4.5~4.8和循环比0.8,Fe-SO4和H2O2反应的加药量分别是0.48kg/m3废水和0.38kg/m^3废水时,芬顿流化床出水的COD为35.6mg/L,COD去除率为73.5%。脱气池投加液碱,调整废水的pH 6.5~7.0、气水比为2.0和停留时间为4.1h时,使Fe^3+与OH-生成Fe(OH)3,再投加PAM,形成Fe(OH)3混凝沉淀,出水清澈透明,过滤池出水达到《太湖地区城镇污水处理厂及重点工业行业主要水污染物排放限值》(DB 321072-2018)中表2的标准。

The advanced treatment of dyeing wastewater in a 6000m^3/d project in Jiangyin was introduced.And the effluent of the secondary sedimentation tank of the dyeing wastewater was treated by fenton oxidation process.The reaction time of the fenton fluidized bed was 30min with pH of 4.5~4.8and cycle ratio of 0.8.Addition amounts of FeSO4and H2O2 were 0.48kg/m^3 wastewater and 0.38kg/m^3 wastewater respectively,COD in effluent was 35.6mg/L and the removal rate was 73.5%.When the liquid alkali was added into the stable tank,the pH was 6.5~7.0,the gas-water ratio was 2and the HRT was 4.1h.Fe^3+and OH-were generated Fe(OH)3.Then PAM was added,the Fe(OH)3coagulation reaction was facilitated,the effluent was clear and transparent.The effluent of filter tank was reached the standard in table 2of the Discharge standard of main water pollutants for municipal wastewater treatment plant&key industries of Taihu area.