What should be done if the clear water discharged after biological treatment of wastewater is light yellow?
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What to do if the clear water discharged after biological treatment of wastewater is light yellow in color?
Yellowing may be caused by high levels of iron ions or colors present in the raw water; generally, decolorizing agents such as hydrogen peroxide, sodium hypochlorite, calcium hypochlorite, and ozone are used for decolorization. However, these are secondary measures – it is still necessary to find solutions related to the operation of the biological unit. Typically, oxidation and sludge aging can lead to sludge desorption.