Statistical assessment of starch removal from starchy wastewater using membrane technology

Abstract

The present work deals with application of 2 5-2 fractional factorial design (FFD) to evaluate the operating parameters on starch separation from synthetic starchy wastewater using a hydrophilic polyethersulfone membrane with 0.65 µm pore size in a plate and frame handmade membrane module. The analysis of variance (ANOVA) combined with F-test was also used to recognize non-significant terms. The performance of the filtration process was evaluated by calculating the COD removal percentage (rejection factor) and permeate flux. In this experiment, five input parameters were surveyed, including trans membrane pressure (TMP), flow and temperature of feed, pH and concentration of wastewater. In this experiment, real wastewater was not used but synthetic starchy wastewater was prepared using starch. Two models were obtained from experimental data, capable of predicting COD removal percentage and permeate flux in different conditions. The predicted values obtained from the regression models were close to the actual ones. For the reduction of fouling, cleaning in place (CIP) method was used.

Application of intelligent modeling to predict the population dynamics of Pseudomonas aeruginosa in Frankfurter sausage containing Satureja bachtiarica extracts

“…Adequacy precision is another index for efficiency of regression models, which compares model output in experimental points with average error predicted by the model. For a model with high precision, the index should take the minimum value of 4 [39]. In this study, the precision adequacy value obtained was 12.43, indicating good fitting of the model to experimental data.…”

Effect of Backwash as a Strategy for Biofouling Control in A Submerged Ceramic Membrane Bioreactor for High-Density Cultivations: Process Optimization and Fouling Mechanism at Pilot Scale

“…Therefore, the study continued only with backwashing using permeate as a method of fouling mitigation. FFD allowed us to examine the effects of variables and their interactions on the average flux during the separation process while reducing the number of experimental runs [44,45].…”

Treatment of starch‐rich wastewater using fly ash‐based low‐cost tubular ceramic membrane

“…Moreover, many of the articles reported about treating starch wastewater with concentration ranging between 0.25 and 5 g/L. But, in actual practice, even after carrying out a sedimentation step prior to membrane filtration, 10 g/L of starch remains in suspended form 14,15,57,58 . Therefore, experiments should be conducted at concentrations around 10 g/L, so as to have a proper idea about membrane's performance when implemented in industrial applications.…”

“…But, in actual practice, even after carrying out a sedimentation step prior to membrane filtration, 10 g/L of starch remains in suspended form. 14,15,57,58 Therefore, experiments should be conducted at concentrations around 10 g/L, so as to have a proper idea about membrane's performance when implemented in industrial applications. One important fact to mention here is that Rocha et al 14 also carried out starch separation from its model solution using fly ashbased tubular membranes.…”