Abstract
The effectiveness of locally available okra pod powder as natural coagulant under varying pH, dosage and settling time in the removal of turbidity from paint waste water at room temperature has been evaluated. The application of single angle Turbidimeter measurement was employed for the experiment. Such kinetic and functional parameter as coagulation rate constant (K), and coagulation period (τ1/2) , were determined. Statistical parameters such as coefficient of determination (R2), sum of squares due to error (SSE), and the root mean square error (RMSE), were used to evaluate the adequacy of the process. The highest value of 1.7×10﹣4L/mg.min for K is recorded at pH 4 and 100 mg/L dosage with τ1/2 of 14.91 min and the least value of K, 3.6×10﹣5L/mg.min is recorded at pH 8 and 300 mg/L doses with τ1/2 of 70.43 min respectively. The efficiency of turbidity removal of more than 80% and 95% was achieved at the end of 3 mins and 30 mins settling time respectively, indicating a system controlled by perikinetic method of coag-flocculation. The results exhibited the potential of pulverized okra pod for removal of suspended particle from paint wastewater.
Highlights
Paint manufacturing industries has increased in Nigeria over the recent years
Determination of dissolved oxygen, biological oxygen demand (BOD), total dissolved solid (TDS), total suspended solid (TSS), chemical oxygen demand and conductivity were carried out according to the standard method for the examination of water and wastewater [27]
The values of coag-flocculation reaction parameters are presented in Tables 3-7, using standard nephelometric jar test
Summary
Paint manufacturing industries has increased in Nigeria over the recent years. Latex paints generally consist of organic and inorganic pigments and dyestuffs, extenders, cellulosic and non-cellulosic thickeners, latexes, emulsifying agents, anti-foaming agents, preservatives, solvents and coalescing agents [1]. The wastewater generated contains suspended solids, toxic compound and color [3] Due to their high toxicity and heavy metal content, industrial wastewaters are strictly regulated and must be treated before being discharged into the environment [4]. Several methods such as coagulation/flocculation, floatation, sedimentation, filtration, membrane process, electrochemical techniques, ion exchange and biological process are used in treating this wastewater [5] [6]. This work is under taken to investigate the suitability of using bio-based coagulant such as Okra pod powder in the removal of turbidity from paint wastewater. Coag-flocculation process was carried out on paint wastewater using Okra pod powder to evaluate the kinetics, and efficiency of the coagulant
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