过氧化氢/臭氧-曝气生物滤池深度处理造纸废水生化出水

Advanced Treatment of Bio-treated Wastewater with Combined H2O2/O3-BAF Process

关键词:  过氧化氢/臭氧氧化  曝气生物滤池  造纸废水生化出水  回用

Key Words:H₂O₂/O₃ oxidation  biologicalaeratedfilter  bio-treated wastewater of papermaking  reuse

摘要:本研究采用过氧化氢/臭氧-曝气生物滤池组合工艺处理造纸废水生化出水，通过实验确定了优化操作参数，并对组合工艺的处理性能进行了探究。结果表明，组合工艺的优化操作条件为：pH值（7.3~8.4）、过氧化氢/臭氧投加量=113/60 mg/mg、氧化时间25 min、曝气生物滤池水力停留时间2.5 h、曝气生物滤池气水比3∶1。在优化操作条件下，过氧化氢/臭氧氧化后废水的生物处理适宜性显著提高；废水经组合工艺处理后，出水COD_Cr<20 mg/L、色度<10倍，达到企业废水回用水质要求。

Abstract:Combined H₂O₂/O₃-biologicalaeratedfilter process （H₂O₂/O₃-BAF） was used for advanced treatment of bio-treated wastewater of papermaking （BWPM） to obtain reusable wastewater， and optimum operational conditions were examined by experiment， meanwhile performance of the combined process also was explored. It was found that optimum operational conditions were pH value=7.3~8.4， H₂O₂/O₃ dosage=113/60 mg/mg， oxidation time=25 min， hydraulic retemtion time （HRT） in BAF=2.5 h， volume rate of air/water in BAF=3∶1. Under the optimum operational condition， bio-treatment suitability of BWPM could be significantly enhanced by H₂O₂/O₃ oxidation， COD_Cr and color in BWPM after H₂O₂/O₃-BAF treatment were always less than 20 mg/L and 10 time， respectively， which met the wastewater requirement in paper mill.