固定化氨氧化细菌短程硝化特性研究

Characterization of short-cut nitrification using immobilized ammonia-oxidizing bacteria

以高分子聚合物为载体,采用固定化细胞增殖技术固定氨氧化细菌,研究温度、pH、碱度和溶解氧等因素对短程硝化过程的影响。实验结果表明,最适宜的温度、pH分别是30℃和8.5;当碱度/NH4+-N(质量比)=6.75时,亚硝化率为87.5%;溶解氧浓度影响氨氧化速率,但对亚硝化率影响不大,溶解氧的适宜质量浓度为4.03mg/L。

Ammonia-oxidizing bacteria （Pseudomonas sp. ） were immobilized by adsorption on the porous copolymer carriers. The effects of temperature, pH, alkalinity and DO concentration on short-cut nitrification mediated by the attached bacteria were determined. When the treatment was performed at 30 ℃, pH of 8.5, and the alkalinity/ NH4^＋ -N of 6.75, 87.5% of ammonia was oxidized to NO2^- -N. The DO level affected the ammonia oxidation rate but had no effect on the short-cut nitrification efficiency; the best DO for the system was 4.03 mg/L.