横流式滤池处理地表水作为景观用水的应用研究

Application of Cross Flow Filter to Treatment of Surface Water as Landscape Water

针对地表水体作为景观用水普遍存在悬浮物浓度高、微污染的问题,以沣河为例,基于其水质特性分析,开展了传统静沉及混凝工艺对地表水的处理性能评价。结果表明,沣河水中SS、COD及氮类污染物浓度偏高,无法达到景观用水水质要求;静沉及混凝工艺可以去除水中悬浮物及有机物,但对氨氮及总氮的去除效果有限。针对此问题,提出了横流式滤池处理工艺,通过滤料截留、生物膜表面吸附等作用,实现了SS、COD、NH_3-N、TN的同时去除。中试结果表明,横流式滤池对SS、COD的去除率可达到85%以上,对NH_3-N和TN的去除率可分别达到33.04%和22.86%,其中对NH_3-N和TN的去除率比混凝沉淀工艺提高约20%。

To solve the problems of high suspended solids and micropollution of surface water when it was used as landscape water,the treatment performance of surface water by the traditional static sedimentation and coagulation process was evaluated based on the analysis of the characteristics of the water quality of Fenghe River. The results showed that the concentrations of SS,COD and nitrogen pollutants in Fenghe River were high and could not meet the requirements of the landscape water body. Static sedimentation and coagulation process could remove SS and organic matter from water,but these two processes could not remove NH_3- N and TN effectively. Aiming at this problem,the cross flow filter process was proposed,in which the simultaneous removal of SS,COD,NH_3- N and TN was achieved by interception of filtered material and adsorption on biofilm surface. The pilot-scale test results showed that the removal rates of SS and COD in the cross flow filter process could reach more than 85%,and the removal rates of NH_3- N and TN could reach 33. 04% and 22. 86% respectively. Compared with coagulation sedimentation process,the removal rates of NH_3- N and TN in the cross flow filter process increased by about 20%.