title: Azo dye decolorization by a halotolerant exoelectrogenic decolorizer isolated from marine sediment.
abstract: Based on both capabilities of extracellular electron transfer and high salt tolerance, marine exoelectrogenic bacteria have the potential to serve as halotolerant/halophilic exoelectrogenic decolorizers (HEDs) for textile wastewater treatment. However, research in this area is still rare. In this study, we employed Shewanella marisflavi EP1 for this purpose. The results showed that EP1 could decolorize Xylidine Ponceau 2R (XP2R) under high NaCl concentrations up to 20%. Two different mechanisms were involved: degradation and bioflocculation. XP2R was decolorized by degradation in the range of 0-7.4% NaCl, by bioaugmented flocculation in 10-20% NaCl; and the range of 7.4-10% NaCl was the transition period from degradation to flocculation. Considering the property of flocculation by strain EP1, it is reasonable that XP2R was hard to penetrate into EP1 cells, thus it was an extracellular process of decolorization. The overall results further suggested that like EP1, marine exoelectrogenic bacteria might serve as a category of functional microbes (i.e., HEDs) for textile wastewater treatment.
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China. Electronic address: fcxu@xmu.edu.cn.
authors.forename: Fangcheng
authors.initials: F
authors.lastname: Xu
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Zhiyi
authors.initials: Z
authors.lastname: Mou
authors.affiliation: Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Jiya
authors.initials: J
authors.lastname: Geng
authors.affiliation: College of Life Sciences, Zhejiang University, Hangzhou 310058, China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Nanobioengineering/Bioelectronics Lab, Department of Biomedical Engineering, Florida International University, Miami, FL, USA.
authors.forename: Chen-Zhong
authors.initials: CZ
authors.lastname: Li
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002851:Chromatography, High Pressure Liquid; D004396:Coloring Agents / Q000737:chemistry*; D019015:Geologic Sediments / Q000382:microbiology*; D007220:Industrial Waste; D020592:Shewanella / Q000378:metabolism; D012965:Sodium Chloride / Q000378:metabolism; D013784:Textiles; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; D012965:Sodium Chloride; D062065:Wastewater; D014874:Water Pollutants, Chemical; C015476:ponceau MX
keywords: Azo dye decolorization; Exoelectrogenic bacteria; Flocculation; Marine exoelectrogenic bacteria; Shewanella marisflavi EP1