固定化氮循环细菌修复城市湖泊水体脱氮效果及N2O排放

利用从镇江金山湖天然水体中筛选分离出的土著氨化、亚硝化、硝化和反硝化细菌,将氮循环细菌固定化后在金山湖示范工程区进行水体脱氮净化效果研究.结果表明,运行一段时间后水质明显得到改善,氨氮、亚硝酸盐氮、硝酸盐氮以及总氮浓度均显著下降,氨氮浓度指标达到国家水质Ⅰ类标准,总氮浓度指标达到水质Ⅱ类标准.同时,对湖泊水体的N_2O气体排放通量进行了检测,结果显示,随着实验的进行,金山湖区的N_2O气体排放通量逐渐升高,4月份的平均值为23,51μg/(m~2·h)、5月份的平均值为29.52μg/(m~2·h)、6月份的平均值为59.10μg/(m~2·h).水质氮素指标以及N_2O气体排放通量数据说明利用微生物固定化载体强化净化技术对城市湖泊水质净化具有显著效果和重要意义.

Nitrogen removal and N2O emission from water purification process by immobilized nitrogen cycling bacteria in urban lake

The process of water purification was studied using immobilized nitrogen cycling bacteria, including ammonibacteria, nitrosobacteria, nitrifying bacteria and denitrifying bacteria, which applied and screened for natural water of Lake Jinshan. The result showed that the water quality was improved obviously after running a period of time. Concentrations of NH_4~+-N, NO_2~--N, NO_3~--N and TN declined. NH_4~+-N concentration had reached national Ⅰ class of water quality index. TN concentration had reached Ⅱ class. The N_2O flux of Lake Jiushan increased during three months from April to June, which were 23.5 μg/(m~2·h), 29.521μg/(m~2·h)and59.10μg/(m~2·h) respectively. The experiment has proved that the techniques of immobilized nitrogen cycling bacteria could purify the urban lakes significantly.