污染沉积物 meaning in Chinese

marine sediments
pollution deposit

This was a particularly severe problem in the lower shing mun river in sha tin , but dredging and a bio - remediation project undertaken in 1997 made a huge difference to the smell of the river
沙田城门河下游以往曾有河水发出恶臭的问题。政府于1997年治理河道，在河床口进行挖掘污染沉积物工程及利用生化处理方法改善沉积物质素，难闻气味已较以前大幅度减少。
To help overcome this problem , the shing mun river improvement works were carried out between 2001 and 2005 . the project improved the quality of the sediment in shing mun river , both by dredging out contaminated sediment and by applying a bioremediation method
为解决气味问题，政府于2001年至2005年间推行城门河环境改善工程，挖掘河床上的污染沉积物及应用生化方法处理淤泥，改善沉积物质素。