固化硝化菌处理微污染氨氮的小试与中试试验

目的分别研究小试中试条件下固化硝化菌对氨氮的去除效果及相关参数的选择，为实际工程提供参考．利用固化技术解决陶粒生物滤池等生物处理无法克服的问题．方法采用包埋硝化菌固化技术，利用气升式内循环好氧流化床和曝气流化床分别对微污染水进行处理．结果在水温为25～27℃，DO（溶解氧）为3～4mg／L的条件下，当进水NH4^＋N平均为1．130mg／L，小试试验选最优水力停留时间HRT=30min时，出水氨氮平均为0．34mg／L，小于0．5mg／L的标准．中试试验在小试试验的基础上进一步证明了固化技术对微污染水中氨氮指标的去除效果，去除率约为70％以上，处理效果较好．结论包埋菌颗粒的密度为1．02～1．04g／cm3，具有良好的生物活性和流态化特性，在微污染水处理方面具有较大潜力，非常适于在自来水厂应用．

Small and Pilot Experiment of Immobilized Nitrobacteria Treating Ammonia Nitrogen in Micro-Polluted Raw Water

The paper aims to study the removal effect of the immobilized nitrobacteria treating ammonia nitrogen under the conditions of small and pilot experiment, and provide reference for the practical project. Curing technology can solve the problem of cell loss and enhance the capacity impact of nitrifying bacteria comparing bio-ceramic reactor. The micro-polluted raw water is treated separately by using immobilized nitrobacteria pellets in air-lift loop and air-life loop aerobic fluidized bed. Under the conditions that the temperature is 25 -27℃ and DO is 3 to 4 mg/L,when the influent NH4 -N is 1. 130 mg/L and best HRT is 30 rain in small experiment, the effluent NH4^＋ -N is 0. 34 mg/L and less than 0.05 mg/L. The pilot experiment based on the small experiment further tests that the curing technology has better efficiency to remove indicator of nitrogen in micro-polluted raw water and removal rate is about 70%. The embedded immobilized ni- trobacteria pellets with density of 1.02～ 1.04 g/cm3 have better biological activity and fluidization in the treatment of micro-polluted raw water and are quite suitable for the application in waterworks.