In summer, COD and BOD are the main pollutants, nitrogen and phosphorus pollution happens in winter.
夏季主要以COD、BOD有机污染为主，冬季以氮、磷污染为主。
Marine dead zones form when nitrogen and phosphorus pollution concentrates in near-coast waters through a process called eutrophication.
氮，磷污染通过被称为富营养化的这个过程，在近海岸水域集中泛滥，从而形成海洋死区。
The nitrogen and phosphorus pollution in water and over nourishment of water is also one of the major environmental issues at present.
微生物在农田污染治理和水体富营养化修复中显示出越来越重要的作用。
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