ACTIVATED SLUDGE TREATMENT OF ACIDIC WASTE WATER CONTAINING ACIDIC SULFITE AND SULFUROUS ACID

摘要

PURPOSE:To treat waste water contg. acidic salts, sulfurous acids, etc. efficiently by adding an alkali soln. contg. specific materials into the acidic waste water, converting the same to thiosulfate and/or sulfite then subjecting the same to activated sludge treatment. CONSTITUTION:An alkali soln. contg. one or more kinds of the group consisting of sulfide, hydrosulfide, and polysulfide is added to the acidic waste water contg. acidic sulfite and/or sulfurous acids. Then, said components are converted to thiosulfate and/or sulfite, after which they are subjected to activated sludge treatment. Said method is also applicable to alkali solns. or alkali waste solns. contg. sulfides, hydrosulfides and polysulfides recovered or discharged from chemical plants generating hydrogen sulfied, sulfides, hydrosulfieds, etc. for petrochemistry, petroleum refining rayon, cellophane and barium salt production, etc.