Applicability Assessment of Electrocoagulation in Real Dyeing Wastewater Treatment

In this study, the applicability of electrocoagulation using iron electrodes in real dyeing wastewater treatment was assessed based on pollutants removal efficiency, sludge generation, energy consumption and operation cost in practice. The effects of current density, pH, conductivity, and reaction t...

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Bibliographic Details
Published in:Nature environment and pollution technology 2021-06, Vol.20 (2), p.587-593
Main Authors: Hung, D.P., Oanh, L.T.K., Chi, V.T.D., Thinh, L.N.Q., Nguyen, D.T., Tuan, N.Q., Han, H.T.N.
Format: Article
Language:English
Subjects:
Chemical oxygen demand
Coagulation
Dyes
Efficiency
Electric currents
Electrocoagulation
electrocoagulation, iron electrodes, real dyeing wastewater, wastewater treatment
Electrodes
Energy consumption
Energy costs
Experiments
Iron
Operating costs
Pollutant removal
Pollutants
Power supply
Reaction time
Sedimentation & deposition
Sludge
Sludge treatment
Wastewater pollution
Wastewater treatment
Water treatment
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Summary:In this study, the applicability of electrocoagulation using iron electrodes in real dyeing wastewater treatment was assessed based on pollutants removal efficiency, sludge generation, energy consumption and operation cost in practice. The effects of current density, pH, conductivity, and reaction time on treatment performance were evaluated. The operation cost of electrocoagulation was calculated including the energy cost, the iron plate cost, generated sludge treatment cost, and added substances cost. The results indicated that the colour, CODcr and TSS removal efficiencies were high and quite stable with short reaction time (reached 92.07 ± 1.21%, 65.7 ± 1.47%, and 89.8 ± 1.2%, respectively, with only 15 min). Average sludge generation, specific energy consumption, and operation cost were determined respectively as 0.645±0.0543 kg/m3, 1.182 kWh/m3 and 0.517 USD/m3. Coagulationflocculation using FeSO4 was performed as a control experiment as well. Compared to coagulationflocculation, electrocoagulation has the same removal efficiency but has less generated sludge (only 50%) and little to no added chemicals. Therefore, the operating cost was quite less than the others, with only 0.517 USD/m3 instead of 1.99 USD/m3 (equal to 1/3.5).
ISSN:0972-6268
2395-3454
DOI:10.46488/NEPT.2021.v20i02.015