,suchasnitrogenandphosphorus,aredischargedintolargelakes,estuaries,baysandotherwaterbodieswhichflowslowly,itwillcauseaphenomenonthatalgaeandotherplanktoninwatermultiplyrapidly,dissolvedoxygendecreases,anismsdie..MechanismExcessnutrients(N、P)anisms(especiallyblue-greenalgaeandredalgae)≧~(BOD)≧10ppmPhosphoruscontent≧~(pH=9~10)Thecontentofchlorophyll–aincharacterizedalgae≧10μmg/,livestockandpoultrymanureandagriculturalchemicalfertilizer..ControlmethodEngineeringmethodsDiggingupthelakesedimentsItisthemainwaysofreducingtheself-..ControlmethodChemicalmethodsCoagulationandsedimentationManykindsofcationscancausethephosphorustoprecipitatefromtheaqueoussolutioneffectively,suchasiron,aluminumandcalciumForexample,,peoplea
水体富营养化英文ppt课件 来自淘豆网www.taodocs.com转载请标明出处.