Treatment methods for acidic (sulfuric acid) wastewater containing high concentrations of trivalent iron
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The company’s wastewater is acidic and contains high concentrations of trivalent iron, as well as large amounts of methanol. What methods can be used to treat it so that it can be discharged in compliance with regulations? I hope experts will kindly offer their guidance! Currently, we use liquid alkali for neutralization; after pumping out the clean water, we dry the waste residue. However, there is too much waste residue, which takes a long time and results in low efficiency. I would also appreciate the guidance from all the experts.
Is it pure or not? It can be used to concentrate and crystallize polyferric sulfate and ferric trichloride
The waste residue can be concentrated and filtered using a filter press to obtain iron scrap residue with a lower moisture content. What is the methanol content in the wastewater? Whether to use azeotropic distillation or direct biochemical treatment for methanol depends on cost analysis.
Lime dosing/PH adjustment + reaction + flocculation + pressure filtration: Trivalent iron, calcium sulfate, etc. are flocculated and then directly filtered under pressure; the clear liquid is subjected to biochemical treatment. Parameters such as dosing amount and reaction time should preferably be determined through experiments.