Sulfate Removal from Extremely Acidic Wastewaters Using Consortia of Acidophilic Sulfate-Reducing Bacteria

2013 ◽  
Vol 825 ◽  
pp. 487-490
Author(s):  
Ivan Nancucheo ◽  
D. Barrie Johnson
Keyword(s):  
Mine Water ◽  
Ferrous Iron ◽  
Close Agreement ◽  
Sulfate Reducing Bacteria ◽  
Low Ph ◽  
Mine Waters ◽  
Sulfate Reducing ◽  
Sulfate Removal ◽  
Water Ph ◽  
Reducing Bacteria

A low pH sulfidogenic bioreactor, maintained between pH 2.8 and 4.0, was used to lower sulfate concentrations in two extremely acidic (pH 1.3 to 3.0) synthetic mine waters that contained ferrous iron but no other chalcophilic metals. Tests with water carried out with synthetic mine water from a German site showed that 98% of the sulfate present could be removed by manipulating the water pH and concentration of electron donor (glycerol) for the sulfate-reducing bacteria. While more sulfate was removed with synthetic Chilean mine water (up to 35 mmoles L-1), this only accounted for between 50-60% of the total present. There was close agreement between the stoichiometry of glycerol used and the amount of sulfate removed, particularly with the German mine water.

Effects of Different COD/Sulfate Ratios on the Growth of Metal Tolerant Sulfate Reducing Bacteria (SRB)

2009 ◽  
Vol 71-73 ◽  
pp. 569-572 ◽  
Author(s):  
L.P. Barbosa ◽  
S.M. Bertolino ◽  
P.C. Freitas ◽  
V.A. Oliveira ◽  
Pablo D. Pina ◽  
...  
Keyword(s):  
Bacterial Resistance ◽  
Industrial Effluents ◽  
Sulfate Reducing Bacteria ◽  
Biological Reduction ◽  
Sulfate Reducing ◽  
Sulfate Removal ◽  
Ph Neutralization ◽  
Reducing Bacteria ◽  
Reduction Capacity ◽  
The Ideal

Sulfate reducing bacteria (SRB) can be used as an alternative biotechnology to promote passive treatment of industrial effluents. Treatment efficiency however depends on pH and metals content of the effluent and also on the quantity of organic matter available. As COD/sulfate ratio varies, sulfate consumption changes. It is commonly assumed that the ideal COD/sulfate ratio is around 0.67. The aim of this work was to optimize the growth and sulfate reduction capacity of mixed bacterial cultures. Samples were cultured using modified Postgate C medium. Metals (Cu, Mn and Ni) were added to the medium in order to study bacterial resistance. Maximum sulfate reducing (98%) was achieved for lactate containing medium, pH 7.0. However, with ethanol containing medium sulfate removal was of about 50%. Acetate production was observed in all cases. Results shown that lactate was more efficient than ethanol for sulfate biological reduction and pH neutralization.

scholarly journals Activity Evaluation of Sulfate Reducing Bacteria for the Sulfate Removal in the Mine Drainage

2016 ◽  
Vol 53 (5) ◽  
pp. 387-397 ◽  
Author(s):  
Hyun-Sung Park ◽  
Myoung-Soo Ko ◽  
Sang-Hwan Lee ◽  
Ji-Hye Hong ◽  
Sang-Hyun Cho ◽  
...  
Keyword(s):  
Mine Drainage ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reducing ◽  
Activity Evaluation ◽  
Sulfate Removal ◽  
Reducing Bacteria

Treatment of sulfate-rich and low pH wastewater by sulfate reducing bacteria with iron shavings in a laboratory

2013 ◽  
Vol 69 (3) ◽  
pp. 595-600 ◽  
Author(s):  
Xiaoye Liu ◽  
Wenqi Gong ◽  
Lin Liu
Keyword(s):  
Wastewater Treatment ◽  
Organic Compounds ◽  
Electron Acceptor ◽  
Sulfate Reducing Bacteria ◽  
Low Ph ◽  
Synthetic Wastewater ◽  
Acidic Environment ◽  
Terminal Electron Acceptor ◽  
Sulfate Reducing ◽  
Reducing Bacteria

Sulfate-rich wastewater is an indirect threat to the environment especially at low pH. Sulfate reducing bacteria (SRB) could use sulfate as the terminal electron acceptor for the degradation of organic compounds and hydrogen transferring SO42− to H2S. However their acute sensitivity to acidity leads to a greatest limitation of SRB applied in such wastewater treatment. With the addition of iron shavings SRB could adapt to such an acidic environment, and 57.97, 55.05 and 14.35% of SO42− was reduced at pH 5, pH 4 and pH 3, respectively. Nevertheless it would be inhibited in too acidic an environment. The behavior of SRB after inoculation in acidic synthetic wastewater with and without iron shavings is presented, and some glutinous substances were generated in the experiments at pH 4 with SRB culture and iron shavings.

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