Development of Fe-EDTA Removal Process Using Sulfate-Reducing Bacteria
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概要
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An upflow anaerobic sludge blanket (UASB) reactor was successfully applied to continuous degradation of ferric ethylene diamine tetra acetate (Fe-EDTA) as a typical xenobiotic substance contained in photo-processing wastewater. The sludge in the UASB reactor had an abundance of sulfate-reducing bacteria (SRB), which had been anaerobically cultivated in a sulfate-rich culture medium including Fe-EDTA and yeast extract as the carbon sources. Since the prominent reductions of Fe-EDTA and sulfate ion were observed, the contribution of SRB to Fe-EDTA degradation in the UASB reactor was confirmed. The aggregated sludge in the UASB rector became gradually large, reaching steady state with an equivalent diameter of 60-90, μm after 92 days operation. An increase of the amount of yeast extract addition to feed solution, which contained 100 mg-C/<I>l</I> of Fe-EDTA, improved the Fe-EDTA removal efficiency up to 90%. Moreover, approximately 80% of intermediate compounds were mineralized by O<SUB>3</SUB>/H<SUB>2</SUB>O<SUB>2</SUB> oxidation process. When the combination of SRB treatment and O<SUB>3</SUB>/H<SUB>2</SUB>O<SUB>2</SUB> was applied to an actual fixing wastewater, approximately 80% of Fe-EDTA and 70% or more of dissolved organic carbon (DOC) in thefixing wastewater were degraded.
- 日本水処理生物学会の論文
日本水処理生物学会 | 論文
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