生物流化床内亚硝酸积累试验

被引:18
作者
袁林江
王志盈
彭党聪
刘芳荣
刘超翔
机构
[1] 西安建筑科技大学环境与市政工程学院!陕西西安
关键词
生物流化床; 亚硝酸积累; 硝化作用; 硝化菌;
D O I
暂无
中图分类号
X131 [环境污染化学];
学科分类号
摘要
利用下向流生物流化床反应器研究了生物膜在硝化过程中亚硝酸积累现象.结果表明,挂膜后反应器运行初期出现亚硝酸积累,但氨氮去除率仍可达到97%.随着硝酸菌的适应与增殖,出水中硝化产物以硝酸为主.进水氨氮浓度提高至200mg/L以上时,再次出现亚硝酸积累.在144mg/L和222mg/L进水浓度下,水力停留时间缩短到5h以下,则氨氮去除率下降且出水中亚硝酸所占比例明显上升;容积负荷提高到0.95kgNH4-N/(m3·d)后也会如此反应器中DO降低到0.5~1mg/L会造成亚硝酸积累和氨氮去除率下降.硝化菌适应低氧环境后对氨氮的去除率仍能恢复到85%,但亚硝酸仍积累,这时生物膜中亚硝酸菌成为优势菌.本文还对影响亚硝酸积累的不同因素进行了分析.
引用
收藏
页码:207 / 210
页数:4
相关论文
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