title: Pretreatment and biodegradability enhancement of DSD acid manufacturing wastewater.
abstract: Two advanced oxidation processes, Fenton's reagent oxidation and ozonation, were used for pretreatment of a 4,4'-diaminostilbene-2,2'-disulfonic acid (DSD-acid) manufacturing wastewater on a laboratory scale. The results showed that both methods are suitable for partial removal of chemical oxygen demand (COD) and color as well as the enhancement of biodegradability of DSD-acid manufacturing wastewater before the conventional biological treatment. Fenton's reagent oxidation by 9.0 g/L H2O2 and 150 mg/L Fe2+ and ozonation by 7.5 g/L O3 led to an improved biodegradability (BOD5/COD = 0.3). Fenton's reagent oxidation in combination with Fe3+ coagulation has shown to effectively remove COD and color. About 90% of COD and 95% of color removals were obtained at the optimum condition, oxidation by 150 mg/L Fe2+ and 2 g/L H2O2, followed by two-stage coagulation with 5 g/L and 2 g/L FeCl3, respectively.
authors.affiliation: Department of Environmental Engineering, Tsinghua University, Beijing, China.
authors.forename: G
authors.initials: G
authors.lastname: Yu
authors.forename: W
authors.initials: W
authors.lastname: Zhu
authors.forename: Z
authors.initials: Z
authors.lastname: Yang
mesh_terms: D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D001673:Biodegradation, Environmental; D002681:China; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D010126:Ozone / Q000737:chemistry; D018505:Waste Management; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification
chemical_list: C045076:Fenton's reagent; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D012856:4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic Acid; D010126:Ozone; C025953:amsonic acid; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen