Abstract
Adsorptive component of coagulation–flocculation of paint wastewater using Brachystegia eurycoma (seed) coagulant was investigated. The bio-sample was analyzed for functional groups, surface morphology and thermal characteristics. The effects of coagulant dosage, effluent pH and settling time on the process were studied. The coagulation data were analyzed in light of adsorption kinetics, isotherm and thermodynamics. Pseudo-second-order and Langmuir models best described the models, and the values recorded for Gibb’s free energy, entropy and enthalpy values were—28.692 kJ/mol, 0.206 kJ/mol and 34.857 kJ/mol, respectively. At the experimental condition, maximum process efficiency (96.50%) was obtained at coagulant dosage of 5 g/L, pH 8 and coagulation temperature of 35 °C. Having satisfactorily correlated coagulation data to adsorption models, it could be inferred that significant component of the process was predominated by adsorption.
Highlights
Paint production is currently one of the major viable small and medium scale enterprises (SMEs) in Nigeria
Brachystegia eurycoma seeds which served as the precursor for the preparation of Brachystegia eurycoma coagulant (BEC) were sourced from Nkanu west in Enugu State, Nigeria
The instrumental analyses results reveal the functionality of the coagulant sample while the jar test operation showed that the removal efficiency of TDSP was greatly influenced by the effects of process parameters
Summary
Paint production is currently one of the major viable small and medium scale enterprises (SMEs) in Nigeria. The wastewater generated from the plant has aroused considerable interest in the scientific community (da Silva et al 2016) and poses great threat to the environment if not properly treated prior to its discharge. This is due to the high quantity of different harmful chemical compounds used in paint production. The release of the wastewater directly into water bodies can constitute to ecological instability, since the presence of color blocks the passage of sunlight, thereby preventing the photosynthesis of aquatic plants, which in turn leads to the depletion of dissolved oxygen (da Silva et al 2016). There is need to reduce their concentrations (the particles in this study) to acceptable standards before discharging into the environment (Simate et al 2012)
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