天津市主要河流水质及污染物入海通量

通过对天津市9条主要入海河流在2006—2010年的出境入海水量及水质等监测资料的统计分析,估算天津市主要入海河流各污染因子的入海通量.结果表明:天津市入海河流的水质以劣Ⅴ类水质为主,独流减河、永定新河和子牙新河污染最为严重,永定河和金钟河水质以Ⅴ类水质为主.与2006年比较,2010年北京排污河和潮白新河2条河流的整体水质有所改善,水质类别提升1个级别,但整体水质污染严重.2008年的污水入海量和污染物入海量均较小,此后的2 a又有所反弹.其中,2010年的污水入海量最大,但其主要污染物较2007年仍然有所下降,COD、氨氮、总氮、总磷入海量分别为2 017.22、300.23、465.00和42.09 t.表明虽然入海污水量在不断增长,但污染物浓度有了一定程度的下降.

Water quality and pollutants fluxes into sea of major rivers in Tianjin city

Every factor of pollutants fluxes into the sea was estimated according to the analysis of monitoring data of water yield and quality of 9 major rivers in Tianjin from year 2006 to 2010. The results demonstrated that the water quality of Tianiin＇s rivers into the sea was mainly worse than Grade V. The water pollution of Duliujian River, Yongding New River and Ziya New River was the severest, and the water quality of Yongding River and Jinzhong River was Grade V-based. Compared with year 2006, the overall quality of Beijing Sewage River and Chaobai New River was improved in 2010, and the water quality was enhanced by one level, otherwise, the comprehensive pollution was still severe. In 2008, the quantity of sewage and pollutants was relatively small yet, it bounced back in the next two years. Among the three years, the seagoing sewage quantity of 2010 was the largest, the COD in which was 2 017.22 t, and ammonia nitrogen, total nitrogen and total phosphorus were 300.23, 465.00 and 42.09 t separately. These pollution contents declined compared with those in 2007, which indicated that the pollution status was relieved though the sewage quantity into the sea increased.