Blecken G-T, Zinger Y, Muthanna T M, Deletic A, Fletcher T D, Viklander M
Urban Water, Department of Civil, Mining and Environmental Engineering, Luleå University of Technology, Luleå, Sweden.
Water Sci Technol. 2007;56(10):83-91. doi: 10.2166/wst.2007.749.
Nutrients can cause eutrophication of natural water bodies. Thus, urban stormwater which is an important nutrient source in urbanised areas has to be treated in order to reduce its nutrient loads. Biofilters which use soil filter media, biofilms and plants, are a good treatment option for nutrients. This paper presents the results of a biofilter column study in cold temperatures (+2 degrees C, +8 degrees C, control at +20 degrees C) which may cause special problems regarding biofilter performance. It was shown that particle-bound pollutants as TSS and a high fraction of phosphorus were reduced well without being negatively influenced by cold temperatures. Nitrogen, however, was not reduced; especially NO(x) was produced in the columns. This behaviour can be explained with both insufficient denitrification and high leaching from the columns.
营养物质会导致天然水体富营养化。因此，城市雨水作为城市化地区重要的营养源，必须进行处理以降低其营养负荷。使用土壤过滤介质、生物膜和植物的生物滤池是处理营养物质的良好选择。本文介绍了在低温（+2摄氏度、+8摄氏度，以+20摄氏度为对照）下进行的生物滤池柱研究结果，低温可能给生物滤池性能带来特殊问题。结果表明，颗粒态污染物如总悬浮物（TSS）以及大部分磷能被有效去除，且不受低温负面影响。然而，氮并未被去除；尤其是生物滤池柱中产生了氮氧化物（NO(x)）。这种现象可通过反硝化作用不足以及生物滤池柱中高淋溶率来解释。
