催化臭氧化-MBR工艺深度处理制药废水实验研究

Advanced treatment of pharmaceutical wastewater by catalytic ozonation-MBR combined process

采用臭氧催化氧化耦合膜生物反应器(MBR)处理工业高浓度制药废水。考察了臭氧催化氧化不同停留时间的影响,非均相臭氧催化剂的稳定性以及经过臭氧催化氧化后进行生化处理性能。结果表明,臭氧催化氧化停留时间90 min,污泥浓度(MLSS)为10.00 g/L,COD处理负荷为1.2 kg/(m^(3)·d),HRT为18 h条件下,非均相臭氧催化剂对该制药废水具有稳定的COD去除率,经过连续运行50 d每天运行8 h,臭氧催化剂展现出较好的稳定性,COD去除率基本可以稳定在45%左右。臭氧催化氧化耦合MBR组合工艺相比单独MBR工艺其COD去除率提高26%左右、氨氮提高36%左右,其中氨氮满足GB 21903—2008排放要求。

The industrial high-concentration pharmaceutical wastewater was treated by an ozone catalytic oxidation coupling membrane bioreactor(MBR).The effects of different residence time of ozone catalytic oxidation,the stability of heterogeneous ozone catalyst and the performance of biochemical treatment after ozone catalytic oxidation were investigated.The results showed that the retention time of ozone catalytic oxidation was 90 min,the sludge concentration(MLSS)was 10.00 g/L,the COD treatment load was 1.2 kg/(m^(3)·d),and the HRT was 18 h.The heterogeneous ozone catalyst had a stable COD removal rate for the pharmaceutical wastewater.After 50 d of continuous operation for 8 h every day,the ozone catalyst showed a good stability,and the COD removal rate could be stable at about 45%.Compared with the single MBR process,the removal rate of COD and ammonia nitrogen of ozone catalytic oxidation combined MBR are increased by about 26%and 36%,among which ammonia nitrogen met the emission requirements of GB 21903—2008.