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Departamento de Química

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Browsing Departamento de Química by advisor "Afonso, Alexandra Isabel Godinho"

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  • Electrochemical oxidation as a strategy for wastewater reuse
    Publication . Farinon, Daliany Maria; Fernandes, Annabel Dias Barrocas; Afonso, Alexandra Isabel Godinho
    This study aims to electrochemically oxidize (EO) industrial wastewater, namely olive mill wastewater (OMW) and membrane concentrate of textile wastewater (MCTW), to produce treated effluents that can be reused in hydroponic agriculture (treated OMW) and as an anti-fouling agent in membrane processes (treated MCTW). OMW treatment was performed using a boron-doped diamond (BDD) anode suitable for mineralizing organic compounds. Three different applied current intensities were studied, 300, 500, and 700 mA. EO removed up to 98% of the chemical oxygen demand (COD). The biodegradability of the treated OMW increased considerably, especially at 500 and 700 mA. The specific energy consumption increased with the applied current intensity. Considering the overall results, the OMW treated at 500 mA was considered the most suitable for hydroponic cultivation. However, it must be diluted in fresh water to adjust pH and electrical conductivity. MCTW treatment used a mixed metal oxide (MMO) anode, which is prone to generating active chlorine species from chloride oxidation. Two different MCTW samples were studied: ultrafiltration retentate (MCTW_1) and reverse osmosis retentate (MCTW_2). With both samples, hypochlorite (ClO-) was generated by EO, leading to treated MCTW samples rich in oxidizing agents with potential for industrial reuse. COD removal was 61% for MCTW_1 and 68% for MCTW_2. Further process optimization is required to minimize energy consumption and chlorate formation. The obtained results showed that EO is a promising process for treating industrial wastewater. It enables the reduction of the pollutant load and the reuse of the treated wastewater in a circular economy approach.
    2024-11-28Master thesis Embargoed access Show more