Long term performance of an AMD treatment bioreactor using chemolithoautotrophic sulfate reduction and ferrous iron precipitation under in situ groundwater conditions
2012
Bilek, F. | Wagner, S.
Chemolithoautotrophic sulfate reduction (CSR) was tested to treat natural acid mine drainage influenced groundwaters. The long term behavior was studied for more than 3years under groundwater conditions (10°C, autochthonous sulfate reducing bacteria (SRB)) without biomass replenishment in a 190L bench scale reactor. The process produces water with alkalinity >10mM. pH can be controlled by p(CO₂) for all expectable water qualities. SRB were immobilized using an expanded clay bed. After 1.3years of operation, a constant biomass content and sulfate reduction rate of [Formula: see text] were established. The sulfate reduction rate was limited by biomass content. Most of the electrons were used for sulfate reduction (98%). The hydrogen turn over in competing processes like methanogenesis and homoacetogenesis was successfully suppressed by adjusting the sulfate concentration to be >2mM in the runoff.
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