新型亚硝化工艺开发研究

Development of new type nitrosation process

采用长污泥龄、低氧或微氧工艺控制亚硝化反应,成功地开发出了一种全新的亚硝化工艺,连续运转245d。试验结果表明,新型亚硝化工艺氨氮转化率平均为68.1%,亚硝酸盐氮生成率为63.7%,硝酸盐氮生成率平均为1.2%,氨氮几乎全部转化为亚硝酸盐氮,未发生硝酸盐积累。出水中氨氮负荷为0.238kgN/(m3·d),亚硝酸盐氮负荷为0.526kgN/(m3·d),污泥龄为198d,污泥比增长率为0.0051d-1,污泥产率为0.0375gVSS/gNH3-N。长污泥龄、低溶解氧、游离氨、亚硝酸抑制等的共同作用,是实现稳定亚硝化的关键。

A new nitrosation process has been developed on the basis of long age low oxygen sludge and micro-oxygen controlled nitrosation reaction. The results of 245 days operation showed that by this way almost all the ammonia nitrogen was conversed into nitrate nitrogen with rates of 68.1%, 63.7% and 1.2% for ammonia nitrogen conversion, nitrite generation and nitrate generation respectively. No nitrate was accumulated. In the effluent gained parameters were 0.238 kgN/( m^3·d ), 0.526 kgN/(m^3·d), 198 days, 0.0051d~ -1 , 0.0375gVSS/gNH_3-N for ammonia loading, nitrite loading, sludge age, specific sludge growth, sludge yield respectively. It was believed that the combined inhibition of long sludge age, low DO level, free ammonia and nitrite could be the main factors for stable nitrosation.