What causes the water in rivers to turn yellow after treatment?
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What causes the water in rivers to turn yellow after treatment?
Were iron salts used as flocculants during treatment? The residual iron salts in the water undergo oxidation, leading to reduction reactions. Additionally, when iron salts are used as flocculants in physical-chemical treatment, the use of sodium hypochlorite as a decolorizing agent will reduce iron ions, causing the color of the effluent to turn yellow and thereby increasing its color intensity.
It depends on what kind of treatment has been done to your substance – whether any chemical agents have been added, such as the iron-based flocculants mentioned by the person above.