摘要
筛选和分离得到的多株脱氮微生物 ,能在完全好氧条件下将氨氮转化为NO2 - ,随即在好氧反硝化菌的作用下还原为N2 排放 ,整个生物脱氮过程历时较短 ,30h内对 2 0 0mg/L的氨氮去除率达 99% ,而且无中间产物NO2 - 的积累 .混合脱氮微生物菌群生长的适宜 pH范围为 7～ 10 ,探索实现混合脱氮微生物菌群高密度培养的 pH :发酵前期补酸控制 pH≤ 8,发酵中后期不控制 pH值 ,可缩短菌体的生长周期 ,提高菌体的氨氮降解速率 ,细胞质量浓度达 3.9g/L ,比自然 pH条件下提高了 6 2 .5 % .
NH 4 + was converted to NO 2 - under aerobic conditions by the screened bacteria, the intermediate NO 2 - was then reduced to N 2 by aerobic denitrifying bacteria, and no NO 2 - was accumulated . 200 mg/L of NH 4 + can be removed within 30 h with a removal rate of 99%. The appropriate pH for the growth of mixed bacteria was 7～10. pH control policy for the high density mixed culture in 5 L fermentor was proposed. By controlling pH value lower than 8 in the early stage and without pH controlling afterwards, cell growth period was shortened and NH 4 + removal rate could be improved, dry cell weight reached 3.9 g/L, increased 62.5% higher than that under natural pH conditions.
出处
《无锡轻工大学学报（食品与生物技术）》
CSCD
北大核心
2002年第5期515-518,532,共5页
Journal of Wuxi University of Light Industry
关键词
混合培养
脱氮微生物
硝化-反硝化
好氧脱氮
denitrifying bacteria
nitrification denitrification
aerobic denitrifying
mixed culture
