The treatment of textile wastewater including chromium(VI) and reactive dye by sulfate-reducing bacterial enrichment

• Published in: Journal of environmental management Vol. 88; no. 1; pp. 76 - 82
• Main Authors: CRETIN, Demet, DÖNMEZ, Sedat, DÖNMEZ, Gönül
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.07.2008; Elsevier; Academic Press Ltd
• Subjects: Animal, plant and microbial ecology; Applied ecology; Applied sciences; Bacteria; Bacteria - metabolism; Biodegradation, Environmental; Biological and medical sciences; bioremediation; Chromium; Chromium - chemistry; Chromium - metabolism; Chromium(VI); Coloring Agents - chemistry; Coloring Agents - metabolism; Conservation, protection and management of environment and wildlife; culture media; Dyes; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; General aspects; hexavalent chromium; Industrial Waste - analysis; Molecular Structure; Pollution; Pollution control; Reactive Dye; reactive dyes; Reduction; sodium chloride; SRB; sulfate-reducing bacteria; sulfates; temporal variation; Textile Industry; textile mill effluents; Time Factors; Waste Disposal, Fluid - methods; Waste management; Wastewater; wastewater treatment; Wastewaters; Water Pollutants, Chemical - chemistry; Water Pollution, Chemical - prevention & control; Water treatment; Water treatment and pollution; Reduction; SRB; Chromium(VI); Reactive Dye; Wastewater; Dyes; Industrial waste water; Bacteria; Sulfates; Environmental management; Chromium VI; Waste water
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2007.01.019

Sulfate-reducing bacteria (SRB) that could grow on modified Postgate C medium (PC) containing chromium(VI) were isolated from industrial wastewaters and their chromium(VI) reduction capacities were investigated as a function of changes in the initial pH values, chromium, sulfate, NaCl and reactive dye concentrations. The optimum pH value at 50 mg l −1 initial chromium(VI) concentration was determined to be 8. Chromium(VI) reduction by SRB was investigated at 22.7–98.4 mg l −1 initial chromium(VI) concentrations. At the end of the experiments, the mixed cultures of SRB were found to reduce within 2–6 days more than 99% of the initial chromium(VI) levels, which ranged from 22.7 to 74.9 mg l −1. The effects of the initial 0–9.0 g l −1 concentrations of disodium sulfate and 0–6% (w/v) concentrations of NaCI to chromium reduction showed that the lowest concentrations of sulfate and NaCI were the best for chromium reduction in the PC medium including 50 mg l −1 chromium(VI). Chromium(VI) reduction in 50 mg l −1 and 25–100 mg l −1 Remazol Blue, Reactive Black B or Reactive Red RB containing media were also investigated. In the experiments, 25–30% of the initial dye concentrations and 95% of the chromium(VI) was removed from the medium at the end of 72-h and 24-h incubation periods, respectively.