,suchasnitrogenandphosphorus,aredischargedintolargelakes,estuaries,baysandotherwaterbodieswhichflowslowly,itwillcauseaphenomenonthatalgaeandotherplanktoninwatermultiplyrapidly,dissolvedoxygendecreases,(N、P)anisms(especiallyblue-greenalgaeandredalgae)≧~(BOD)≧10ppmPhosphoruscontent≧~(pH=9~10)Thecontentofchlorophyll–aincharacterizedalgae≧10μmg/,-,suchasiron,aluminumandcalciumForexample,,p
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