D湖源水和自来水中三氮变化及迁移研究

Variations and transformations of nitrogen pollutants in source and tap water of D-Lake

研究了不同时期D湖源水和自来水中“三氮”及总氮污染状况和变化趋势 ,考察了自来水常规生产工艺中氮的去除效果和自然状态下各水体“三氮”迁移规律。结果表明 :D湖源水和自来水中“三氮”污染程度主湖区D水厂高于侧湖区T水厂 ,以内河为水源的Z水厂“三氮”低于D水厂且有与D湖不同的分布规律及变化特点。常规净水工艺虽可转化部分“三氮” ,但其总体去除率不高 (2 0 %左右 )。进一步研究其迁移规律发现 :D水厂源水和管网水随时间变化 ,氨氮可转化为亚硝酸盐氮 ,亚硝酸盐氮又进一步转化为硝酸盐氮。除部分转化为气态氮而从水中逸出外 ,大部分硝酸盐氮以稳定形态NO-3

Ammonia, nitrite and nitrate pollutions and variations in source water and tap water of D Lake are investigated. The removal effects of nitrogen in routine proceeding of water production and the transformations of the different forms of nitrogen in natural condition with simulated test are studied at the same time. The results show that the nitrogen pollutions in source and tap water of D waterworks are higher than T waterworks', although both waterworks have same resource. Compared with D waterworks, the nitrogen pollutions of source and tap water in Z waterworks are lower than D waterworks' and they have different variation and distribution. The forms of nitrogen could be partly transformed during the routine production, but the total percentage of nitrogen removal efficiency is not significant (just about 20%).The simulate test shows that NH + 4 N could change into NO - 2 N, while NO - 2 N into NO - 3 N, which is partly transformed into nitrogen gas by microorganism and majority of which are remained in tap water by form of NO - 3 N.