Copper, a prevalent heavy metal in industrial mining wastewaters, has been shown to inhibit nitrification in wastewater treatment systems. Biofilm treatment systems have an inherent potential to reduce inhibition. This study investigated the effects of copper concentration on nitrifying biofilms in moving bed biofilm reactor (MBBR) systems across long term operation using influent ammonia concentrations representative of gold mining wastewater. Conventional isotherm models did not adequately model the attachment of copper to the biofilm. Long term nitritation was shown to be uninhibited at influent copper concentrations between 0.13 and 0.61 mg Cu/L. Nitratation was inhibited with influent copper concentrations of 0.28–0.61 mg Cu/L. There was no statistical difference in biofilm characteristics, including biofilm thickness, mass and density, across all copper concentrations tested, however, changes in biofilm morphology were observed. The demonstrated resistance of the nitrifying biofilm to copper inhibition makes the MBBR system a promising technology for treating ammonia in mining wastewaters.
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The authors would like to acknowledge Veolia Water Technologies Canada for technical support and in kind donations. In addition, the authors would like the thank Dr. Nimal Desilva for his assistance in analyzing copper concentrations, and Meghan Thompson for laboratory assistance.
This study was partially funded by the NSERC CREATE in Technologies for Microbiome Science and Engineering (TECHNOMISE CREATE 497995-2017).
Conflict of interest
The authors declare that they have no conflict of interest.
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Schopf, A., Delatolla, R., Mathew, R. et al. Investigation of copper inhibition of nitrifying moving bed biofilm (MBBR) reactors during long term operations. Bioprocess Biosyst Eng 41, 1485–1495 (2018). https://doi.org/10.1007/s00449-018-1976-2
- Long term operation
- Moving bed biofilm reactor (MBBR)