Comparative analysis of brewing wastewater and lactate as carbon sources for microbial community treating acid mine drainage in anaerobic MBBR systems
2021
Akinpelu, Enoch Akinbiyi | Ntwampe, Seteno K. O. | Fosso-Kankeu, Elvis | Waanders, Frans
This study investigated the effect of carbon sources (n = 2) on the performance of a microbial community in an anaerobic moving-bed biofilm reactor (MBBR) treating acid mine drainage (AMD). The 1.5 L anaerobic MBBR was operated across a range of hydraulic retention times – HRT’s (3–18 days), using different substrates, i.e. brewing wastewater and lactate as sole carbon sources and electron donors. Maximum sulphate reduction and chemical oxygen demand (COD) consumption rate was 21.94 and 24.28 mg L⁻¹ h⁻¹, and 0.473 and 0.697 mg COD L⁻¹ d⁻¹ for brewing wastewater and lactate supplemented bioreactors, respectively, at an HRT of 3 days. The maximum COD/ ratio was found to be 2.564 in the bioreactor supplemented with brewing wastewater at an HRT of 15 days. The metal removal above 70% in the system supplemented with brewing wastewater followed the order; Be²⁺ > Fe²⁺ > Sr²⁺ > Pb²⁺ > Mg²⁺ > Cu²⁺ > Zn²⁺ > Li¹⁺ > Ca²⁺ in comparison to the system supplemented with lactate, Be²⁺ > Fe²⁺ > Sr²⁺ > Mg²⁺ > Cu²⁺ > Li¹⁺ > Zn²⁺ > Pb²⁺ after an HRT of 18 days. Complete removal of beryllium (II) was observed irrespective of the carbon source used. The results clearly showed that brewing wastewater can be deployed as a nutritional supplement in environmental remediation of AMD.
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