TY - JOUR
T1 - Low energy electrochemical oxidation efficiently oxidizes a common textile dye used in Thailand
AU - Phetrak, Athit
AU - Westerhoff, Paul
AU - Garcia-Segura, Sergi
N1 - Funding Information:
This work was partially funded by the National Science Foundation ( EEC-1449500 ) Nanosystems Engineering Research Center on Nanotechnology-Enabled Water Treatment . The authors would like to thank the financial support provided by Mahidol University under Scholarships for Academic and Supportive Staff Mobility 2019. Laurel Passantino provided technical editing.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/8/15
Y1 - 2020/8/15
N2 - Organic dyes are extensively used worldwide in the textile industry. Thailand's textile industry, which is mostly composed of small- and mid-sized factories that produce wastewater streams, would benefit from efficient, small-sized, and easy to operate treatment technologies. Electrochemical oxidation (ECO) is an alternative to historic solutions (e.g., biological treatment, coagulation, membranes, ozone) to treat dyebath effluents and reuse the water for secondary, non-potable purposes. ECO is an advanced oxidation process capable of in-situ electrogeneration of hydroxyl radical to completely mineralize organic pollutants. This work demonstrates the capability of electrochemically-driven systems to efficiently decolorize and mineralize dyebath effluents containing anthraquinone dye Acid Green 25. Achieving color and chemical oxygen demand abatement to below effluent discharge limits was attained using only 100 mA cm−2. Breaking the aromatic rings successfully produced readily biodegradable, low molecular weight carboxylic acids and inorganic (ammonium, nitrate) total nitrogen below 7 mg-N L−1, which can be readily discharged to sewers or even urban surface waters. The competitiveness of the electrochemical system is analyzed using engineering figures of merit, and the impacts of operational variables are discussed in terms of removal percentage, efficiency, and electrical energy per order. Results suggest wide applicability as an alternative for treating textile manufacturing waste streams.
AB - Organic dyes are extensively used worldwide in the textile industry. Thailand's textile industry, which is mostly composed of small- and mid-sized factories that produce wastewater streams, would benefit from efficient, small-sized, and easy to operate treatment technologies. Electrochemical oxidation (ECO) is an alternative to historic solutions (e.g., biological treatment, coagulation, membranes, ozone) to treat dyebath effluents and reuse the water for secondary, non-potable purposes. ECO is an advanced oxidation process capable of in-situ electrogeneration of hydroxyl radical to completely mineralize organic pollutants. This work demonstrates the capability of electrochemically-driven systems to efficiently decolorize and mineralize dyebath effluents containing anthraquinone dye Acid Green 25. Achieving color and chemical oxygen demand abatement to below effluent discharge limits was attained using only 100 mA cm−2. Breaking the aromatic rings successfully produced readily biodegradable, low molecular weight carboxylic acids and inorganic (ammonium, nitrate) total nitrogen below 7 mg-N L−1, which can be readily discharged to sewers or even urban surface waters. The competitiveness of the electrochemical system is analyzed using engineering figures of merit, and the impacts of operational variables are discussed in terms of removal percentage, efficiency, and electrical energy per order. Results suggest wide applicability as an alternative for treating textile manufacturing waste streams.
KW - Anthraquinone dyes
KW - Boron-doped diamond
KW - Electrical energy per order
KW - Electrochemical advanced oxidation processes
KW - Electrochlorination
KW - Water treatment
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U2 - 10.1016/j.jelechem.2020.114301
DO - 10.1016/j.jelechem.2020.114301
M3 - Article
AN - SCOPUS:85086465802
SN - 1572-6657
VL - 871
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
M1 - 114301
ER -