The structure, material, specific surface area and roughness of bio-media are the important factors influencing the efficiency of in-situ bio-film technique. Three kinds of novel suspended bio-media suitable for in-situ remediation are compared in regard to the effect of ammonia-nitrogen,nitrate-nitrogen, and total nitrogen on various bio-media in the treatment of slightly polluted raw water. The results show that the sponge ball suspended medium has large specific surface area and its special inner structure is beneficial for forming various biological community structures, showing the best stability and denitrification capacity during operation. The hard suspended medium also has a desirable denitrification effect, but is second to sponge ball suspended medium since its material and surface structure is suitable for the growth and cultivation of microorganism. However, the main reason resulting in the poor denitrification capacity of the foamed plastic suspended medium is that the bio-film becomes detached easily.%填料的结构、材质、比表面积及粗糙度等是影响原位生物膜技术的关键因素.选取了适合水库原位修复的3种新型悬浮填料,分别从氨氮、硝氮、总氮等方面对各种填料处理微污染原水进行了比较.试验结果表明,海绵球悬浮填料比表面积大,其特殊的内部结构有利于形成种类丰富的生物群落结构,在运行期间表现出最佳的稳定性和脱氮性能:硬性悬浮填料的脱氮效果仅次于海绵球悬浮填料,其材质和表面结构适合微生物的生长和繁殖;生物膜容易脱落是影响发泡塑料悬浮填料脱氮性能及稳定性的一个主要原因.
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