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A novel microbial electrolysis cell-A/O system effectively treats cotton dyeing pretreatment wastewater, achieving 69.13% COD removal efficiency.

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What they did

System
MEC

What worked

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Abstract

Abstract The textile industry is developing rapidly in China. It generates large volumes of cotton dyeing pretreatment wastewater (CDPW). CDPW contains high concentrations of pollutants characterized by their strongly alkaline and recalcitrant nature for microbial degradation. This project aimed to evaluate the performance of a microbial electrolysis cell (MEC) coupled with anoxic/oxic (A/O) system (MEC-A/O) in treating CDPW, as well as analyze changes in microbial diversity. The results indicated that the effect of biological treatment in an electrolytic cell to treat CDPW was optimal at the voltage of 0.6V. The chemical oxygen demand (COD) removal efficiency under optimum conditions was 69.13%, higher than that of the A/O system alone (48.93%). Within a certain range, applied voltage was able to enhance microbial activity, increase the sludge concentration and enlarge the sludge particle size. At the same time, the applied voltage could effectively increase the abundance and the diversity of Bacteria and Archaea, as well as accelerate the degradation of pollutants.

Key findings

  • The optimal voltage for biological treatment in the MEC-A/O system is 0.6V.
  • The MEC-A/O system outperforms the A/O system alone in COD removal efficiency.
  • Applied voltage enhances microbial activity, increases sludge concentration, and enlarges sludge particle size.

Keywords

Microbial electrolysis cellElectrolysisActivated sludgeAnoxic watersWastewaterChemical oxygen demand

Identifiers

DOI
10.2166/wst.2019.216
Journal
Water Science and Technology
Year
2019