Formaldehyde is converted to CO 2 or used for cell synthesis, and sulfide is oxidized to sulfate. Combined physical, chemical, and biological treatment.īiological breakdown of DMSO produces dimethylsulfide (DMS), which ultimately produces 2 mol of formaldehyde and 1 mol of sulfide. Activated sludge entrapped in polyethylene glycol prepolymer pellets was applied to the continuous treatment of organic wastewater discharged from a semiconductor plant that had a BOD of 150 to 200 mg/L at a loading rate of 5.21 kg BOD/m 3/day achieving BOD removal efficiencies of 95 to 97% ( Hashimoto and Sumino, 1998).įIGURE 14-4. The combined treatment was capable of lowering the wastewater COD concentration from 80,000 mg/L to below 100 mg/L and completely eliminated the wastewater color ( Lin and Jiang, 2003). Using sludge from a municipal wastewater treatment plant, an aerobic sequencing batch reactor with a 12-h cycle, and mixed liquor suspended solids (MLSS) of 3,000 mg/L was able to achieve an 85% reduction in COD. The use of 5 g/L of FeSO 4 and 45 g/L of H 2O 2 for the oxidation achieved a 95% reduction in COD and a 99% reduction in the color of the effluent. Fenton oxidation of this stripped stream was carried out after diluting it with other effluents. The initial treatment consisted of air stripping the effluent using a packed column at a temperature of 70☌ to recover 95% of the ipa at 9% purity.

Complex effluents having a COD of 80,000 mg/L and isopropyl alcohol (ipa) of 35,000 mg/L cannot be treated effectively with one technique alone but can be successfully treated using a process that combines physical, chemical, and biological methods ( Fig.

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Iso propyl alcohol