Kev thov cov pa oxygen, tseem hu ua chemical oxygen noj, lossis COD luv luv, siv cov tshuaj oxidants (xws li potassium dichromate) los oxidize thiab decompose oxidizable tshuaj (xws li cov organic teeb meem, nitrite, ferrous ntsev, sulfides, thiab lwm yam) hauv dej, thiab ces Oxygen noj yog calcu...
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