How should emergency measures be taken in case the levels of hexavalent chromium in the effluent from wastewater treatment plants are significantly above the allowed limits?
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How should emergency measures be taken in case the levels of hexavalent chromium in the effluent from wastewater treatment plants are significantly above the allowed limits?
First, it is necessary to explain the situation of this sewage source so that appropriate actions can be taken based on the actual conditions. Simply put, I can only tell you that adding reducing agents reduces the content of hexavalent chromium to the allowable level.
Chlorite is added to reduce it to trivalent chromium. Add more NaOH to form a precipitate, being careful to keep the pH around 8.5.
Scrap metal shavings are used to reduce the residual hexavalent chromium to trivalent chromium, which is then neutralized with spent alkaline solutions or lime to produce a less toxic chromium hydroxide precipitate. The waste residue is treated as solid waste; it is generally believed that hexavalent chromium is 100 times more toxic than trivalent chromium.
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After reducing it to the +3 valence state, an alkali solution is added to induce precipitation.