Soft drink wastewater treatment by electrocoagulation-electrooxidation processes.
Ivonne Linares Hernández1, Carlos Barrera Díaz2, Mario Valdés Cerecero2
1a Centro Interamericano de Recursos del Agua (CIRA) , Universidad Autónoma del Estado de México , Toluca , Estado de México , México.
Environmental Technology
|June 4, 2016
Summary
A combined electrocoagulation-electrooxidation system effectively treats soft drink wastewater, significantly reducing organic pollutants and enabling water reuse. This sustainable approach lowers costs and treatment time for industrial effluent.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Electrochemistry
Background:
- Soft drink wastewater contains high organic and inorganic loads, posing challenges for conventional treatment.
- Existing methods may be inefficient or costly for treating complex industrial effluents.
- Sustainable wastewater management is crucial for reducing environmental impact and promoting water reuse.
Purpose of the Study:
- To implement and evaluate a coupled monopolar Electrocoagulation (EC)-Electrooxidation (EO) system for soft drink wastewater treatment.
- To assess the efficiency of the EC-EO system in removing Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC).
- To determine the energy consumption and economic viability of the coupled treatment process.
Main Methods:
- Initial Electrocoagulation (EC) tests using Cu-Cu electrodes at varying current densities.
- Subsequent Electrooxidation (EO) treatment with boron-doped diamond-Cu electrodes.
- Coupled EC-EO system implementation for comprehensive wastewater treatment.
- Analysis of COD, TOC removal efficiencies, and energy consumption.
Main Results:
- Single EC treatment showed limited efficiency (37.67% COD, 27% TOC removal) due to inorganic ion interference.
- The coupled EC-EO system achieved high removal efficiencies: 75% TOC and 85% COD.
- Energy consumption was calculated as 3.19 kWh/kg TOC and 6.66 kWh/kg COD for EC treatment.
- The coupled system significantly reduced organic pollutants from initial concentrations of 1875 mg/L TOC and 4300 mg/L COD.
Conclusions:
- The coupled EC-EO system is highly effective for treating soft drink wastewater.
- This integrated approach reduces operating costs and treatment residence time.
- The treated effluent is suitable for reuse in indirect contact with humans, promoting sustainable industrial wastewater management.
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