Treatment of 2-phenylamino-3-methyl-6-di-n-butylaminofluoran production effluent by combination of biological treatments and Fenton's oxidation.
High strength refractory organic stream is produced during the production of 2-phenylamino-3-methyl-6-di-n-butylaminofluoran (One Dye Black 2, abbr. ODB 2), a novel heat-sensitive material with a promising market. In this study, a combination of acidification-precipitation, primary biological treatment, Fenton's oxidation and another biological treatment was successfully used for the removal of COD from 18000-25000 mg/L to below 200 mg/L from the ODB 2 production wastewater in a pilot experiment. A COD removal of 70%-80% was achieved by acidification-precipitation under a pH of 2.5-3.0. The first step biodegradation permitted an average COD removal of 70% under an hydraulic residence time (HRT) of 30 h. By batch tests, the optimum conditions of Fenton's oxidation were acquired as: Fe2+ dose 6.0 mmol/L; H202 dose 3000 mg/L; and reaction time 6 h. The second step biological treatment could ensure an effluent COD below 200 mg/L under an HRT of 10 h following the Fenton's treatment.
Ding
Wei
W
College of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237. great@ecust.edu.cn
Gao
Ying-xin
YX
Yang
Min
M
Ding
Ran
R
Zhang
Yu
Y
D000814:Aniline Compounds / Q000737:chemistry*; D001673:Biodegradation, Environmental; D005452:Fluoresceins / Q000737:chemistry*; D015394:Molecular Structure; D009930:Organic Chemicals / Q000737:chemistry*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods
C527499:2-phenylamino-3-methyl-6-di-n-butylaminofluoran; D000814:Aniline Compounds; D005452:Fluoresceins; D009930:Organic Chemicals