曝气生物滤池/接触氧化内循环处理受污染湖水

Biological Aerated Filter/Contact Oxidation Tank for Treatment of Polluted Lake Water

针对南方地区某校园内受污染的湖泊水,采用曝气生物滤池(BAF)和接触氧化池进行强化处理,在上升流速为4 m/h、气水比为1∶1的条件下,稳定运行期间装填陶粒的曝气生物滤池及装填碳素纤维填料的接触氧化池对COD平均去除率分别为50.0%和21.0%。处理前原水COD为41.0~46.0 mg/L,NH_3-N为0.34~1.04 mg/L,为《地表水环境质量标准》(GB 3838—2002)的Ⅴ类水质,且蓝藻大暴发,影响景观;经4个月的内循环处理,湖水COD降至20.0 mg/L左右,NH_3-N稳定低于0.50 mg/L,COD指标符合《地表水环境质量标准》(GB 3838—2002)的Ⅳ类水标准,NH_3-N达到Ⅱ类水标准,未见蓝藻暴发,水体景观得以良好恢复。

The biological aerated filter （BAF） and contact oxidation tank were used for enhanced treatment of the polluted lake water at a university in southern China. When the up-flow velocity was 4 m/h, and the air-water ratio was 1 ： 1, the average removal rates of COD by BAF with ceramsite and contact oxidation tank with carbon fiber during the stable stage were 50.0% and 21.0%, respectively. Before treatment, the raw water with COD of 41.0 to 46.0 mg/L and ammonia nitrogen of 0.34 to 1.04 mg/L was the class Ⅴ criteria specified in the Environmental Quality Standards for Surface Water （GB 3838 -2002）, with algae outbreak and landscape being influenced. After internal circulation treatment for font months, the concentration of COD was reduced to around 20 mg/L, meeting the Ⅳ criteria, and the concentration of ammonia nitrogen was below 0.50 mg/L, meeting the Ⅱ criteria. Blue-green algae was effectively controlled, and the landscape of the lake was recovered well.