生物接触氧化法原位修复受污染河水的效果

In-situ Remediation Efficiency of Polluted River Water by Biological Contact Oxidation Process

在滇池北岸典型重污染河道建设了生物接触氧化原位修复示范工程,其采用仿生填料、人工接种菌群和曝气增氧组合技术,共运行两年多,历经了完整的旱季和雨季。对运行效果的跟踪监测显示,示范工程在旱季能够达到稳定、持续的污染物净化效果,能够明显消除黑臭、削减有机物和氮的含量,旱季的平均处理规模为17 000 m3/d,对COD的平均去除率达到40.1%,COD削减量平均为458.6 kg/d,对BOD5的平均去除率为40%,BOD5削减量平均为184.8 kg/d,对总氮的平均去除率达到13.5%,总氮削减量平均为71.5 kg/d,出水透明度可达到1 m以上。在雨季随着降雨量的增大,会影响示范工程的处理效果,但该示范工程并不影响河道的行洪安全,并且雨季过后净化效果能恢复稳定。由此可见,在滇池重污染河道进行生物接触氧化原位修复工程能够有效改善受污染河流水质,减少入湖污染负荷。

An in-situ remediation demonstration project using biological contact oxidation process was constructed on a heavily polluted river channel at north bank of Dianehi Lake. Bionic fillers, artificially inoculated bacteria species and aerated oxygenation were used in the demonstration project, and it operated for more than two years and experienced a dry season and a wet season. The monitoring results showed that the project could significantly improve the black-odor phenomenon and reduce organic compounds and nitrogen in the river in dry season. The average treatment capacity was 17 000 m3/d in dry season. The removal rates of COD, BOD5 and TN were 40.1% , 40% and 13.5% , and their reduction volumes were 458.6 kg/d, 184.8 kg/d and 71.5 kg/d respectively. The effluent transparency reached above 1 m. In wet season, the treatment efficiency of the demonstration project was influenced by rainfall. The demonstration projeet had no effect on river flooding, and the purification efficiency could be recovered after wet season. It is concluded that the in-situ remediation demonstration projeet using biological contact oxidation process can effectively improve polluted river water quality, thus reducing pollution load into lake.