Abstract
Co-treatment of acid mine drainage (AMD) with municipal wastewater (MWW) using the activated sludge process is a novel treatment technology offering potential savings over alternative systems in materials, proprietary chemicals and energy inputs. The impacts of AMD on laboratory-scale activated sludge units (plug-flow and sequencing batch reactors) treating synthetic MWW were investigated. Synthetic AMD containing Al, Cu, Fe, Mn, Pb, Zn and SO4 at a range of concentrations and pH values was formulated to simulate three possible co-treatment processes, i.e., (1) adding raw AMD to the activated sludge aeration tank, (2) pre-treating AMD prior to adding to the aeration tank by mixing with digested sludge and (3) pre-treating AMD by mixing with screened MWW. Continuous AMD loading to the activated sludge reactors during co-treatment did not cause a significant decrease in chemical oxygen demand (COD), 5-day biochemical oxygen demand, or total organic carbon removal; average COD removal rates ranged from 87–93 %. Enhanced phosphate removal was observed in reactors loaded with Fe- and Al-rich AMD, with final effluent TP concentrations <2 mg/L. Removal rates for dissolved Al, Cu, Fe and Pb were 52–84 %, 47–61 %, 74–86 % and 100 %, respectively, in both systems. Manganese and Zn removal were strongly linked to acidity; removal from net-acidic AMD was <10 % for both metals, whereas removal from circum-neutral AMD averaged 93–95 % for Mn and 58–90 % for Zn. Pre-mixing with screened MWW was the best process option in terms of AMD neutralization and metal removal. However, significant MWW alkalinity was consumed, suggesting an alkali supplement may be necessary.
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Abbreviations
- AMD:
-
Acid mine drainage
- BOD5 :
-
Five-day biochemical oxygen demand
- COD:
-
Chemical oxygen demand
- DO:
-
Dissolved oxygen
- f/m:
-
Food-to-microorganism
- HRT:
-
Hydraulic retention time
- MLSS:
-
Mixed liquor suspended solids
- MWW:
-
Municipal wastewater
- SBR:
-
Sequencing batch reactor
- SRT:
-
Solids retention time
- SS:
-
Suspended solids
- SVI:
-
Sludge volume index
- TN:
-
Total nitrogen
- TOC:
-
Total organic carbon
- TP:
-
Total phosphorus
- WWTP:
-
Wastewater treatment plant
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Acknowledgments
T. Hughes gratefully acknowledges the support provided by the Irish Research Council for Science, Engineering, and Technology (IRCSET) Embark Initiative and Science Foundation Ireland (SFI) (Grant Number: 08/RFP/ENM993). In addition, the authors extend sincere appreciation to the personnel at the WWTPs located in Leixlip, Co. Kildare, Swords, Co. Dublin, and Athy, Co. Kildare, for their assistance.
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Hughes, T.A., Gray, N.F. Co-treatment of acid mine drainage with municipal wastewater: performance evaluation. Environ Sci Pollut Res 20, 7863–7877 (2013). https://doi.org/10.1007/s11356-012-1303-4
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DOI: https://doi.org/10.1007/s11356-012-1303-4