The supernatant of electroplating wastewater turns milky white after aeration
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The wastewater is a mixture of chromium and nickel from an electroplating company; it is treated through chemical precipitation using hydrogen peroxide, ferrous sulfate, sodium metabisulfite, lime, caustic soda, heavy metal capturers, and anionic PAM. The supernatant is then aerated in an aeration tank, and salt acid is added to adjust the pH value. As a result, the originally clear supernatant turns milky white – what is the reason for this? How to detect this cause?
Was sodium sulfide added during the treatment? If it was, then when acid is added to adjust the pH, the water will turn milky white
It’s probably demulsified. Check if the white liquid has an odd smell