Abstract
In this study, cashew nut husk was used to prepare agro-based coagulant (Tanhusk). The agro-based coagulant was compared with aluminum sulfate (alum) in the treatment of paint industry effluent (PIE). The effects of parameters such as pH (4–12), contact time (0–60 min), and coagulant dosage (100–500 mg/L) on the effluent decontamination were investigated. Coagulation/flocculation efficiency using Tanhusk was found to increase with contact time and decreasing pH, while alum performed better at alkaline conditions. A comparison of the results gave an efficiency of alum at 91% and Tanhusk at 73.18%. The kinetics of the coagulation and flocculation treatment of PIE using alum and Tanhusk by the integral and particle aggregation were studied. The reaction order kinetics for alum and Tanhusk were second order. The rate constants were 0.00008 L/mg and 0.00005 L/mg min for alum and Tanhusk, respectively. The kinetics of particle aggregation based on Tanhusk bio-coagulant dosage and effluent pH showed that the destabilization of monomers facilitated the forming of dimers and trimers. The study affirmed that the plant-based coagulant Tanhusk can be a potential replacement for alum for the treatment of paint effluent.
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The data supporting the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
Appreciation is hereby given to the Federal Government of Nigeria for financial support in the experimental work through the Earned Allowances Research Fund. We wish to thank the staff of Sharon Paints Company, Ninth mile, Ngwo, Enugu state, Nigeria, for technical support.
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JUA: conceptualization, methodology, data analysis, writing – review and editing. KGA: writing – review and editing. NJN: data analysis, writing – review and editing. IOO: data analysis, writing – review and editing. SIE: writing – review and editing. ODO: conceptualization and editing. UCO: conceptualization and editing.
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Ani, J.U., Akpomie, K.G., Nnaji, N.J. et al. Process efficiency and kinetics of coagulation for the decontamination of paint industry effluent using cashew nut husk tannins and alum. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-03834-5
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DOI: https://doi.org/10.1007/s13399-023-03834-5