REMOVAL OF TURBIDITY FROM PAINT AND BREWERY INDUSTRIAL WASTEWATERS USING SEQUENTIAL COAG-FLOCCULATION AND ADSORPTION PROCESSES
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- NGN 3000
ABSTRACT
The continuous industrial development in Nigeria has resulted in the generation of industrial wastewaters. Thwastewaters are usually discharged without proper treatment which affects the environment. There are severatechniques applied in the treatment of wastewaters but coag-flocculation and adsorption processes was appliedThus, the present work focused on the utilization of natural coagulants/adsorbents in the removal of turbidity iwastewaters. The aim of this study was to investigate the removal of turbidity from paint and brewery industriawastewaters using sequential coag-flocculation and adsorption processes. Theobjectives were to: prepare ancharacterize biocoagulants from Detaruim microcarpum (DMC), Xanthosoma (CYC), Hibiscus esculentus (OSCand Crassostrea virginica (ODC) and biosorbents from Mucuna pruriens (MSA), Canaruim schweirfurlhi (AESAand Crassostrea virginica (OSA); study the various coag-flocculation/adsorption parameters such as pH, dosageand contact time; study the adsorption isotherms, kinetic and thermodynamic of the process; and optimize thprocess using response surface methodology (RSM).The biocoagulants and biosorbents were produced ancharacterized using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X-radiffraction (XRD) and X-ray fluorescence (XRF). Jar test and batch adsorption processes were carried out in order tdetermine the effects of process parameters on the turbidity removal. The experimental data were evaluated by fouisotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) and four kinetic models (pseudo-firstorder, pseudo-second-order, Elovich and intraparticles diffusion). The process was optimized using RSM. Thresultsof characterization of biocoagulants and biosorbents showed that the materials are good for the removal oturbidity from the wastewaters. The removal efficiency of turbidity is dependent on the initial wastewater pHdosage and time. The optimum turbidity removal efficiency of 90.45% wasobtained at 100.53mg/L, pH 2 ansettling time 24.45min for coagulationwhile the optimum removal efficiency of turbidity for of 99.8% was obtainewith 26.66mg, pH 6.66 and contact time 69.6min for adsorption. The experimental data fitted well to Langmuiisotherm model and pseudo-second-order kinetic model.The thermodynamic study showed the adsorption proceswas spontaneous and endothermic in nature.This work has shown that coag-flocculation and adsorption are vereffective in turbidity removal from paint and brewery wastewaters.This work has successfully transformed naturaand abundant materials into coagulants/adsorbents that can be used for wastewater treatment. Hence, thescoagulants and adsorbents are recommended for wastewater treatment.
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