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This study proposes a combined approach of cryopurification and microbial fuel cell (MFC) process to treat mine-impacted water, with a focus on zinc removal. The results show that up to 80-95% of zinc can be removed after a single freezing cycle using cryopurification, and the MFC process can further treat the post-cryopurification brine. The combined approach demonstrates potential for effective zinc removal from contaminated water.

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What they did

System
MFC
Substrate
real wastewater
Inoculum
Shewanella oneidensis MR-1

What worked

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Abstract

Abstract In the current study, a water treatment approach integrating freezing technology, so-called cryopurification, and microbial fuel cell (MFC) process is proposed and tested towards zinc removal. Contaminated water samples used for laboratory experiments were received from the Faro Mine site, Yukon, Canada. Through cryopurification, the effect of freezing temperature, mixing and the direction of ice front propagation on zinc removal from the Faro mine water was investigated and quantitively analyzed. The MFC was used to treat a post-cryopurification brine, both at a laboratory scale. When the coolant temperature ranged from − 5 to − 1 ̊ C and 180 rpm solution mixing was used, up to 80–95% of zinc was removed after a single freezing cycle. The results of laboratory experiments demonstrated that zinc concentrations in mine water can be reduced by cryopurification to 0.5 mg/L (effluent quality standard) under optimal experimental conditions. The MFC process was run for 120 h to test the capacity of the microorganism ( Shewanella oneidensis ) towards zinc removal from the brine concentrated by freezing. Based on the results of laboratory experiments, MFC showed a reliable and high zinc removal up to 90–93 % with Shewanella oneidensis incubated in the anode. The MFC generated a power density and open-circuit voltage with a maximum result of 8.8 mW/m 2 and 168.5 mV , respectively.

Key findings

  • Up to 80-95% of zinc can be removed after a single freezing cycle using cryopurification
  • Zinc concentrations in mine water can be reduced to 0.5 mg/L (effluent quality standard) under optimal experimental conditions
  • The MFC process can treat post-cryopurification brine, with Shewanella oneidensis demonstrating capacity for zinc removal

Keywords

Microbial fuel cellProcess (computing)Waste management

Identifiers

DOI
10.21203/rs.3.rs-3617060/v1
Journal
Research Square
Year
2024