title: Production of a bioflocculant from chromotropic acid waste water and its application in steroid estrogen removal.
abstract: A novel strain (designated as SW-2) which could convert chromotropic acid into bioflocculants was isolated from chromotropic acid wastewater. Conditions for bioflocculants production were optimized by response surface methodology (RSM) and determined to be inoculum size 7.74%, initial pH 6.9, and CODCr of the chromotropic acid wastewater 425mg/L. The yielded bioflocculant was primarily consisting of polysaccharide and protein. It could maintain its flocculating activity to 0.4% (w/w) kaolin suspensions over pH 3-9 and 20-80°C. In addition, conditions for the removal of estrogens with the bioflocculant were investigated and determined to be bioflocculant dosage 50mg/L, initial pH 3, reaction time 60min, and temperature 45°C. Under these optimal conditions, the removal efficiencies of E1, E2, EE2, and E3 were 87%, 92%, 88% and 96%, respectively. The bioflocculant was shown to offer a promising alternative method of removing estrogens from water in pretreatment applications.
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China; School of Chemistry and Life Science, Hubei University of Education, Wuhan 430205, China.
authors.forename: Chunying
authors.initials: C
authors.lastname: Zhong
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Aihua
authors.initials: A
authors.lastname: Xu
authors.affiliation: Central China Normal University Library, Wuhan 430079, China.
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Xianghui
authors.initials: X
authors.lastname: Yang
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Baokun
authors.initials: B
authors.lastname: Yang
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Hong
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Kewei
authors.initials: K
authors.lastname: Mao
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
authors.forename: Buyun
authors.initials: B
authors.lastname: Wang
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China. Electronic address: wallice24@hotmail.com.
authors.forename: Jiangang
authors.initials: J
authors.lastname: Zhou
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004967:Estrogens / Q000302:isolation & purification*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013818:Thermogravimetry; D062065:Wastewater / Q000737:chemistry*
chemical_list: D004967:Estrogens; D062065:Wastewater
keywords: Bioflocculant; Chromotropic acid; Estrogen; Response surface methodology; Sphingomonas yabuuchiae