臭氧氧化—A/O工艺处理PVA废水

采用臭氧氧化—A/O工艺处理聚乙烯醇（PVA）废水,研究了臭氧氧化时间、臭氧流量以及废水pH等因素对臭氧氧化效果的影响。实验结果表明：当气体臭氧质量浓度为30 mg/L、臭氧氧化时间为45 min、臭氧流量为4 L/min、废水pH为8时,PVA质量浓度从进水的93.2 mg/L降至4.5 mg/L;PVA溶液的BOD₅/COD从0.014增加至0.310,可生化性明显改善;臭氧氧化—A/O工艺处理后出水COD降至50 mg/L左右,达到GB 8978—1996《污水综合排放标准》中的一级排放标准;出水PVA质量浓度为1.6 mg/L,明显优于A/O工艺（33.1 mg/L）。

Treatment of PVA wastewater by ozone oxidation-A/O process

PVA（polyvinyl alcohol）wastewater was treated by ozone oxidation-A/O process,and the factors affecting ozone oxidation were explored. The experimental results showed that：When the mass concentration of ozone in gas was 30 mg/L,the ozone flow rate was 4 L/min and the wastewater pH was 8,the PVA mass concentration was decreased from 93.2 mg/L of influent to 4.5 mg/L of effluent;Meanwhile,the BOD₅/COD of pure PVA solution was increased from 0.014 to 0.310,which indicated that the biodegradability of the wastewater was improved effectively;The effluent COD was decreased to 50 mg/L by the ozone oxidation-A/O process,which met the first grade discharge standard of GB 8978-1996;The PVA mass concentration of the effluent was 1.6 mg/L,which was much better than that by A/O process（33.1 mg/L）.