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Removal of Heavy Metals Using Sulfate Reducing Bacteria

In this study. the possibility to remove heavy metals in various industrial wastewater using sulfate reducing bacteria(SRB). For the proper selection of heavy metal as well as COD: SO₄^2-: heavy metal ratio. several kinds of serum bottle test(SBT) were conducted. In addition, using a coagulated tannery wastewater(add to 500 glucose mg/ℓ) as a feed, a batch-type anaerobic reactor having a working volume of 13.7ℓ was operated for 132 days in order to culture the acclimatized SRB and to investigate the sulfate reducing potential. When the heavy metal. such as iron, copper, and zinc, was added up to 100 mg/ℓ to medium of SBT without sulfate(COD:SO₄^2-:heavy metal= 1:0:0.1), the organic removal rate was seriously inhibited due probably to the toxic effect of heavy metal. But, in the case of sulfate-riching condition(COD:SO₄^2-:heavy metal =1:1:0.1), the organic removal rate increased up to 95 % and sulfate reducing rate was much more than the blank with no added sulfate. Among three kinds of heavy metal. iron showed the most reasonable results with respect to sulfate reduction. According to the operating results of anaerobic bach reactor, organic removal and sulfate reducing rate was maintained to 59 and 78%. respectively. when the COD loading rate was 0.11 kg/㎥ •d and sulfate loading rate(SLR) was 0.1 kg SO₄^2-/㎥•d.