Umwuka wa ogisijeni ukomoka ku miti, uzwi kandi nko gukoresha ogisijeni ya chimique, cyangwa COD mu magambo ahinnye, ukoresha okiside ya chimique (nka potasiyumu dichromate) mu guhumeka no kubora ibintu bya okiside (nk'ibinyabuzima, nitrite, umunyu wa ferrous, sulfide, n'ibindi) mu mazi, hanyuma gukoresha Oxygene ni calcu ...
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