臭氧-混凝沉淀工艺深度处理印染废水的中试实验

Pilot Experiment of Advanced Treatment of Printing and Dyeing Wastewater by Ozone-coagulation Precipitation Process

以江苏某印染厂提标改造为基础,采用臭氧氧化-混凝沉淀耦合工艺对印染厂二沉池出水进行深度处理,通过优化系统运行参数。考察了该组合工艺对印染废水的降解效果。结果表明:在反应时间为30 min、臭氧浓度为45 mg/L的条件下,臭氧氧化效能达到最高,COD去除率为24.5%;通过与混凝沉淀组合,COD和TP的去除率为50.1%和78.4%,均达到《纺织染整工业水污染物排放标准》(GB4287-2012)排放标准。中试设备电耗和药剂成本为1.072元/t,具有较好的经济效益。

Based on the upgrading and transformation of a printing and dyeing plant in Jiangsu,the combined process of ozone oxidation and coagulation sedimentation was used to perform advanced treatment of the effluent from the secondary sedimentation tank of the printing and dyeing plant.By optimizing the operating parameters of the system,the degradation effect of the combined process on the printing and dyeing wastewater was investigated.The results showed that:under the conditions of 30 min reaction time and 45 mg/L ozone concentration,the ozone oxidation efficiency reached the highest,and the COD removal rate was 24.5%;combined with coagulation precipitation,the removal rate of COD and TP was 50.1%And 78.4%,both meet the emission standard of"Water Pollutant Discharge Standard for Textile Dyeing and Finishing Industry"(GB4287-2012).The power consumption of the pilot plant and the cost of medicament are 1.072 yuan/t,which has good economic benefits.