To better control and prevent water pollution in rivers, it is necessary to know the conditions of water quality in rivers in time.
为了更好的对河流水体污染进行控制和治理，及时了解河流的水质状况是必要的。
Work was energetically carried forward to improve the water environment of Taihu Lake and prevent and control water pollution in the Liao, Huai and Songhua rivers and other key water basins.
太湖水环境综合治理和松花江、淮河、辽河等重点流域水污染防治工作积极推进。
Nitrogen and Phosphorus are restricted severely to prevent the water eutrophication. Biological nutrient removal (BNR) is an important water pollution control technology.
为遏制水体的富营养化，氮、磷的排放标准日趋严格，生物脱氮除磷工艺能有效地去除水体中的氮、磷。
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