“蒸发-电催化-A/O”组合工艺处理扑热息痛制药废水的研究

Treatment of paracetamol wastewater by evaporation-electrocatalysis-A/O combination process

采用"蒸发-电催化-A/O"组合工艺处理高浓度扑热息痛制药废水,实验结果表明:蒸发脱盐阶段,p H影响不大,COD去除率达到80%以上,全盐去除率达到99%以上,色度由100倍降为10倍;电催化氧化阶段,p H为7,反应时间为2 h,电流为2 A时,COD去除率达到45%;生化处理阶段,当生化进水COD控制在2 000 mg/L左右时,生化体系对该废水的去除率为80%,其中缺氧阶段为30%,好氧阶段为70%;最后出水COD≤500 mg/L。满足《污水综合排放标准》(GB 8978—1996)三级排放标准的要求。

The high concentration wastewater from paracetamol production is treated by a combination process of evaporation-electrocatalysis-A/O biochemical treatment. The experiments show the following results： In the evaporative desalination stage,pH has small influence,the COD removal rate exceed 80%,the total salt removal rate is above 99%,and the chroma of wastewater decreases from 100 times to 10 times; In the electrocatalytic oxidation stage,the COD removal rate reaches 45% when the pH is 7,the reaction time lasts for 2 h and the electric current is 2 A; In the biochemical treatment stage,when the COD of influent wastewater is controlled around 2 000 mg·L-1,the total COD removal rate in the biochemical system is 80%,of which the anoxic section contributes 30% and the aerobic section occupies 70%.The COD content of final effluent is not more than 500 mg·L-1,which meets the requirements of the Grade Three discharge standard specified in the Integrated Wastewater Discharge Standard（ GB 8978—1996）.