Deturbidization of Vegetable Oil Refinery Wastewater with Extracted Fish Scale Biomass via Coagulation Process; Non-linear Kinetics Studies

Abstract

Chito-protein was successfully synthesized from fish scale. The ability of a coagulant (chito-protein) prepared from fish scale (FSC) to carry out an effective removal of pollutants from food processing industry (vegetable oil industry wastewater, VOW) was evaluated at bench scale using a simulated jar test analysis. The coagulant was characterized via proximate analysis and instrumental analysis: Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The maximum kinetic parameters determined were recorded at K of 2x10-5L/mg.min, 1g, t1∕2= 50 min, R2= 0.9245 and pH of 2.Regression coefficient analysis (R2) was used to ascertain the accuracy of the fit to the postulated kinetic model. However, it was concluded that the second order kinetic model described the reaction most adequately. Removal efficiency of turbidity (87.21%) was obtained at optimum contact time of 30 min, pH 2, coagulant dosage of 1.5g and temperature of 323K. Kinetic study showed that Pseudo first order and pseudo second order models were the best two models in describing the coag-adsorptive kinetics of the coagulant. Similarly, the predicted kinetic data were adjured statistically significant using F- test and T-test.

Kinetics and mechanistic analysis of particles decontamination from abattoir wastewater (ABW) using novel Fish Bone Chito-protein (FBC)

“…The initial sample parameters (pH and turbidity) were measured and recorded, 1 g/L – 5 g/L of the coagulant were dosed into the ABW samples. The resultant mixture were stirred for 2 min at 250rpm (G = 550 s -1 ), and 20 min at 30 rpm using magnetic stirrer (B.Bran Scientific model 78HW-1) [ 16 ]. At the end of the 20 min stirring, the resultant mixtures were allowed to settle for 60min.…”

“…Some are sourced from waste materials or natural materials that are of less economical values, like shells, bones, leaves, bark and wood of trees and some parts of fruits that are not edible among other sources. Many researchers have reported the use of moringa olifera extract [ 15 ], fish scales [ 16 ], crab shell [ 17 ], mucuna [ 18 ] and tannin [ 19 ] among others. Natural coagulants can be freely returned to nature without adverse effects.…”

Response Surface Methodology optimization of chito-protein synthesized from crab shell in treatment of abattoir wastewater

“…Coagulation/flocculation techniques have been recommended and used by many researchers successfully in treating wastewater however, with diverse views ( Okey-Onyesolu et al., 2018a ). Conventionally, industries employ the use of chemical coagulants in the treatment of wastewaters without considering the side effect of synthetic chemicals.…”