Kufunika kwa okosijeni wa Chemical, komwe kumadziwikanso kuti chemical oxygen consumption, kapena COD mwachidule, kumagwiritsa ntchito okosijeni wamankhwala (monga potassium dichromate) kuti oxidize ndi kuwola zinthu zomwe zimatha okosijeni (monga organic matter, nitrite, ferrous salt, sulfides, etc.) m'madzi, ndipo kugwiritsa ntchito oxygen ndi calcu ...
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