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EVALUATION AND OPTIMIZATION OF A NEW MICROBIAL ENHANCEMENT PLUG-FLOW DITCH SYSTEM FOR THE PRETREATMENT OF ACID MINE DRAINAGE: SEMI-PILOT TEST
Song, Y., H. Wang, J. Yang, L. Zhou, J. Zhou, and Y. Cao.
RSC Advances 8:1039(2018)
A novel microbial enhanced plug-flow ditch reaction system was developed for pretreatment of AMD at semi-pilot scale. The pilot was used to examine system stability under different hydraulic retention times (HRTs) and to compare the effects of microbe-enhanced/lime-neutralization technology and direct lime neutralization. The bio-oxidation efficiency of Fe2+ (5 g/L) reached 100% in some parts of the system when HRT was 3 and 2 days, and the time taken to reach steady state was 6 and 4 days, respectively. When the HRT was 1 day, the reaction system operated for 4 days before equilibrium was lost. At the optimum HRT (2 days) and after the system was stable, the average precipitation rate of total Fe was 53.62% and the average removal rate of As(III) was 17.27%. Following microbial enhanced pretreatment, the amount of lime required and waste residues generated for AMD neutralization decreased by 75% and 85.25%, respectively. http://pubs.rsc.org/en/content/articlepdf/2018/ra/c7ra10765j
RSC Advances 8:1039(2018)
A novel microbial enhanced plug-flow ditch reaction system was developed for pretreatment of AMD at semi-pilot scale. The pilot was used to examine system stability under different hydraulic retention times (HRTs) and to compare the effects of microbe-enhanced/lime-neutralization technology and direct lime neutralization. The bio-oxidation efficiency of Fe2+ (5 g/L) reached 100% in some parts of the system when HRT was 3 and 2 days, and the time taken to reach steady state was 6 and 4 days, respectively. When the HRT was 1 day, the reaction system operated for 4 days before equilibrium was lost. At the optimum HRT (2 days) and after the system was stable, the average precipitation rate of total Fe was 53.62% and the average removal rate of As(III) was 17.27%. Following microbial enhanced pretreatment, the amount of lime required and waste residues generated for AMD neutralization decreased by 75% and 85.25%, respectively. http://pubs.rsc.org/en/content/articlepdf/2018/ra/c7ra10765j
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