Emerging contaminants removal from effluents with complex matrices by electrooxidation

Area of Science:

• Environmental Chemistry
• Electrochemistry
• Wastewater Treatment

Background:

• Sanitary landfill leachate contains emerging contaminants like methiocarb and bisphenol A.
• Complex matrices in leachate pose challenges for conventional treatment methods.
• Boron-doped diamond (BDD) anodes show promise for advanced oxidation processes.

Purpose of the Study:

• To investigate the electrooxidation of methiocarb and bisphenol A in simulated and real landfill leachate.
• To assess the impact of carbon source, electrolyte, and current density on contaminant removal.
• To evaluate the efficacy of BDD anodes for treating complex industrial wastewater.

Main Methods:

• Electrooxidation experiments were conducted using a boron-doped diamond anode.
• Simulated leachate varied in carbon source (glucose/humic acid) and electrolyte (NaCl/Na2SO4).
• Real leachate experiments focused on the influence of current density.

Main Results:

• BDD electrooxidation successfully degraded methiocarb and bisphenol A in complex leachate matrices.
• Methiocarb was found to be more susceptible to oxidation than bisphenol A.
• Increased removal rates were observed with the presence of chloride and higher humic acid content.

Conclusions:

• Electrooxidation with BDD anodes is a viable technology for removing emerging contaminants from sanitary landfill leachate.
• Optimizing electrolyte composition (e.g., chloride presence) and organic matter content can enhance treatment efficiency.
• BDD electrooxidation offers a promising solution for the challenges posed by contaminated landfill leachate.