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采用预臭氧—曝气生物活性炭滤池(O_3—BAC)工艺处理低碳源的北运河通州段原水,探讨了该系统的主要工艺参数与各项污染物去除效果的相关性。研究结果表明,臭氧的投加对提高COD_(Cr)和NH_3—N的去除效果均有促进作用,且在投加量3 mg/L、接触时间30 min时臭氧利用效率最高;在此投加量和接触时间、回流比1:1时,COD_(Cr)和NH_3—N的去除率分别可达42%和94.3%,均高于回流比为0.5:1时,而TN去除率为13.4%,有所降低,投加外碳源和降低好氧单元气水比可使之升高;系统对UV_(254)去除率达到38.8%,其中臭氧接触单元去除率为18.66%,由臭氧氧化特性推断,原水中大分子有机物以芳香族化合物为主。
The raw water of Tongzhou section of Beijiaohe Canal with low carbon source was treated by pre-ozone-biological activated carbon filter (O_3-BAC), and the correlation between the main process parameters of the system and the removal of pollutants was discussed. The results showed that the addition of ozone promoted the removal of COD_ (Cr) and NH_3-N, and the ozone utilization efficiency was the highest when the dosage was 3 mg / L and the contact time was 30 min. The removal rates of COD Cr and NH 3 -N were respectively 42% and 94.3% when the reflux ratio was 1: 1, which was higher than that when the reflux ratio was 0.5: 1, while the TN removal rate was 13.4% , Decreased with the increase of external carbon source and air-water ratio of aerobic unit. The UV_ (254) removal rate of the system reached 38.8%, of which the ozone contact unit removal rate was 18.66%. The ozone oxidation characteristics Inferred, the original organic compounds in water macromolecular compounds.