Abstract:

Taking the micro-polluted river water as water sample, the operational efficacy of sand biofilter and GAC-sand biofilter has been investigated through pilot-scale experiments.The feasibility of the biofilters for treating this water body is discussed.The results show that the treated water quality can be obviously improved by the biofilters. Both biofilters show good results for the removal of turbidity. The average removal rate of sand biofilter on NH₃-N, COD_Mn and UV₂₅₄are 72.4%, 19.6% and 22.9% respectively. The GAC-sand biofilter shows much better operational effect.The average removal rate on NH₃-N,COD_Mn and UV₂₅₄are 84.5%, 39.6% and 42.5% respectively. The removal rate of both biofilters on NO₂^--N is nearly 100% during steady operation. But during the operation period and in treating the sudden changes of water quality,the GAC-sand biofilter is clearly better than that of the sand biofilter. Therefore, the treated water quality can be improved much better by the GAC -sand biofilter.This study provides experimental basis for water plants with the feasibility and effectiveness of reforming ordinary filters to biofilters.

Key words: granular active carbon- sand filter, sand filter, biofilter, micro-polluted water

摘要：

以微污染江水为试验水样,通过中试考察了石英砂滤池和GAC-石英砂滤池的运行效能,探讨生物滤池处理此类水体的可行性。结果表明,生物滤池处理微污染水可获得良好的出水水质。二者对浊度有很好的去除效果;石英砂滤池对NH₃-N、COD_Mn及UV254平均去除率分别为72.4%、19.6%及22.9%;GAC-石英砂滤池运行效果更好,平均去除率分别达84.5%、39.6%和42.5%;稳定运行期间,二者对NO₂^--N的去除率接近100%,但在运行周期及应对水质突变方面,GAC-石英砂滤池的性能明显优于石英砂滤池,因此,采用GAC-石英砂滤池可以更好地提高出水水质。本研究为给水厂普通滤池改造成生物滤池的可行性和有效性提供了试验依据。

关键词: 活性炭-石英砂双层滤池, 石英砂滤料, 生物滤池, 微污染水

CLC Number: 

• TU991.2