中文摘要：

为提高好氧反硝化细菌生长及效能，设置不同磁粉投加量梯度（0．5～3．0g／L，每0．5g／L为一个投加量梯度）投入好氧反硝化培养基，培养24h后测定T13的生长吸光度、硝酸盐氮去除效能、脱氢酶活性等3项指标．结果表明：投加磁粉后菌株生长有所促进，T13的硝氮去除效能和脱氢酶活性随磁粉投加量的增加呈现先升后降的趋势；投加量在2．5g／L及以下时，磁粉均表现促进作用．磁粉促进了好氧反硝化菌的生长和效能，2．0g／L为最适磁粉投加量，此投加量下T13的脱氢酶活性和硝氮去除率分别达最大值73．9μg/（mL·h）和100％．

英文摘要：

To improve the growth and efficiency of aerobic denitrifying bacteria, by adding different dose of magnetic powder （within 0.5 -3.0 g/L, 0. 5 g/L for a gradient） and after 24 h, the growth absorbency, hitrate removal rate and dehydrogenase activity were determinated. Results show that the growth increases, and the nitrogen removal efficiency and dehydrogenase activity of T13 first increase and then decrease with increasing of magnetic powder dosage. The magnetic powder promotes the aerobic denitrifying bacteria growth and efficiency, and 2.0 g/L of magnetic powder is the optimal dosing quantity, under which the dehydrogenase activity and denitration nitrogen removal of T13 go to the maximum 73.9 μg/（ mL· h） and 100% respectively.