LüMiao,LIZhenbang,WANGQuanyong.O3-BAC Process: Performance Comparison of Pre-, Mid-, and Post-positioned Configurations[J].China Water & Wastewater,2026,42(4):1-9.
O3-BAC工艺：前置、中置与后置的性能对比
- Title:
- O3-BAC Process: Performance Comparison of Pre-, Mid-, and Post-positioned Configurations
- Keywords:
- advanced treatment; pre-positioned O3-BAC; mid-positioned O3-BAC; post-positioned O3-BAC; organic matter; taste and odor compounds
- 摘要:
- 臭氧-生物活性炭（O3-BAC）深度处理工艺可根据其与常规工艺的相对位置，分为前置、中置与后置O3-BAC三种模式，为明确各工艺在污染物去除方面的特征，对比了前置、中置与后置O3-BAC工艺的作用机制与设计参数，并从有机物、嗅味物质、氨氮、浊度等关键水质指标的去除效率及生物安全性等多个维度综合评估其实际处理效能。结果表明，前置O3-BAC工艺优先去除原水有机物、嗅味物质、藻类和氨氮，可强化常规处理，避免微生物泄漏；中置工艺采用微膨胀运行的中置-上向流BAC滤池，省去二次提升，但运行效率受进水量影响较大，有时需增设微絮凝来保障后续过滤效果；后置工艺作为常规处理后的终端保障，可进一步改善水质，但面临生物降解与泄漏控制的矛盾，通常结合超滤膜保障出水的生物安全性。净水厂需要结合不同原水水质和净水目标，合理选择工艺类型，保证水质安全。
- Abstract:
- The ozone-biological activated carbon (O3-BAC) advanced treatment process, based on its relative position to the conventional treatment process, can be divided into three modes: pre-, mid-, and post-positioned O3-BAC. To clarify the characteristics of each process in pollutant removal, a systematic comparison was conducted on the action mechanisms and design parameters of the pre-, mid-, and post-positioned O3-BAC processes. Their actual treatment efficiency was comprehensively evaluated from multiple dimensions, including the removal efficiency of key water quality indicators such as organic matters, taste and odor compounds, ammonia nitrogen, and turbidity, as well as biological safety. The results indicate that the pre-positioned O3-BAC process preferentially removes raw water organic matters, taste and odor compounds, algae, and ammonia nitrogen, thereby enhancing conventional treatment and preventing microbial leakage. The mid-positioned process utilizes a mid-positioned-upflow BAC filter operating under slight expansion conditions, eliminating the need for secondary lifting. However, its operational efficiency is significantly influenced by the inflow rate. Sometimes, micro-flocculation needs to be added to ensure subsequent filtration effectiveness. The post-positioned process serves as a terminal safeguard following conventional treatment, further improving water quality. Nevertheless, it faces the challenge of balancing biological degradation with the control of biological leakage, and is typically combined with ultrafiltration membranes to ensure the biological safety of the effluent. Overall, water treatment plants must rationally select the process type based on different raw water qualities and purification objectives to ensure water safety.
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