循环水排污水处理组合工艺应用及评估

以华能巢湖电厂循环水排污水处理工程为例,跟踪了采用物化-生物组合工艺处理火电厂循环水排污水达标排放的工艺流程,评估了不同处理单元对各污染物去除的贡献率。结果表明:包括曝气生物流化床→混凝澄清池→臭氧接触氧化池→生物活性炭滤池→石英砂过滤器的物化-生物组合工艺可实现对火电厂循环水排污水的高效稳定处理,处理后水质能够满足《地表水环境质量标准》(GB 3838—2002)Ⅳ类水体标准要求;曝气生物流化床和生物活性炭滤池的设置,强化了系统对氮和有机物的高效去除;混凝澄清池和生物活性炭滤池对循环水排污水中浊度、总磷、溶解性总磷和磷酸盐去除发挥着重要作用,而设于工艺末端的石英砂过滤器则确保了出水浊度的稳定达标;臭氧接触氧化池的设置不仅可大幅提高循环水排污水的可生化性,也有利于后续生物处理单元对水中污染物的进一步净化。该结论对于类似水质和排放要求的火电厂循环水排污水处理,具有重要的参考价值。

Pilot study on combined process of catalytic ozonation and biological activated carbon for organic pollutants removal

A combined process of catalytic ozonation in the presence of a novel heterogeneous catalyst and biological activated carbon was investigated for the removal of priority control organic pollutants, the reduction of genotoxicity, and the improvement of biodegradable dissolved organic carbon (BDOC). Results confirm that the catalytic ozonation has higher effectiveness for the removal of refractory harmful organic pollutants, the reduction of genotoxicity and the increase of bio-degradability of organics than ozonation alone, which results in lower pollution load for subsequent biological activated carbon process, and then leads to less organic pollutants penetrating biological activated carbon. The novel catalytic ozonation with this combined process exhibits excellent performance to guarantee the safety of drinking water.