城市内河水体污染修复中沉积物的影响与控制

Effects of Sediment and Its Control in the Restoration of Polluted Urban River

研究了城市河道污染沉积物在污染修复中对上覆水质的影响及其控制 .结果表明 :河道水质在净化后 ,通过引水或充氧使河道保持一定的溶解氧 ,可有效抑制沉积物中有机物、氨氮等污染物的释放 .否则由于底泥缺氧释放 ,氨氮明显回升 ,而有机物不会很快上升 ,反而因反硝化消耗碳源继续有所下降 ;由于反硝化过程产生碱度使水体pH略有升高 ,更接近中性 。

Effect of polluted sediment in city river on upper water quality and its control were studied. The result showed that, after the river water was purified, release of organic, ammonia etc can be inhabited by drawing fresh water or aeration to improve DO concentration in river. Or ammonia concentration will increase due to anoxic release of sediment. Organic will continue to decrease owing to denitrification resulted in consumption of carbon source. Due to alkaline produced by denitrification, which resulted ...