Kudiwa kwemakemikari okisijeni, inozivikanwawo semakemikari okisijeni kushandiswa, kana COD kwenguva pfupi, inoshandisa kemikari oxidants (yakadai sepotassium dichromate) kuokisisa uye kuodza zvinhu zvinogoneka (senge organic matter, nitrite, ferrous salts, sulfides, etc.) mumvura, uyezve kushandisa Oxygen is calcu...
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