Optimization of electrocoagulation process to treat biologically pretreated bagasse effluent

The main objective of the present study was to investigate the efficiency of electrocoagulation process as a post-treatment to treat biologically pretreated bagasse effluent using iron electrodes. The removal of chemical oxygen demand (COD) and total suspended solids (TSS) were studied under different operating conditions such as amount of dilution, initial pH, applied current and electrolyte dose by using response surface methodology (RSM) coupled with four-factor three-level Box-Behnken experimental design (BBD). The experimental results were analyzed by Pareto analysis of variance (ANOVA) and second order polynomial mathematical models were developed with high correlation of efficiency (R2) for COD, TSS removal and electrical energy consumption (EEC). The individual and combined effect of variables on responses was studied using three dimensional response surface plots. Under the optimum operating conditions, such as amount of dilution at 30 %, initial pH of 6.5, applied current of 8 mA cm-2 and electrolyte dose of 740 mg l-1 shows the higher removal efficiency of COD (98 %) and TSS (93 %) with EEC of 2.40 Wh, which were confirmed by validation experiments

Enhancement of shelf life of Coriandrum sativum leaves using vacuum drying

A vacuum drying process was employed to deal with the moisture removal, Vitamin C content and total dietary fiber from coriander leaves (dhania). Box–Behnken design (BBD) and response surface methodology (RSM) were applied to evaluate and optimize the three key drying parameters, namely temperature (A), loading rate (B) and vacuum (C). This approach provided statistically significant quadratic model, which was adequate to predict response and to carry out optimization under the conditions studied. It was demonstrated that the interaction between all the drying parameters has a significant effect on the moisture removal. The optimal conditions were found to be temperature of 75 °C, loading rate of 0.63 kg/m2 and vacuum = 28 mm Hg. Under these conditions, 95% moisture removal, 527 mg/100 g Vitamin C content and 13 g/100 g total dietary fiber were obtained. Finally, product quality was also examined

Influence of process conditions on the physicochemical properties of pomegranate juice in spray drying process:

In this study an attempt was made to investigate the efficiency of spray drying process of pomegranate juice using response surface methodology (RSM). Different drying conditions such as inlet air temperature (A), feed flow rate (B) and aspirator rate (C) were varied in order to study the changes in quality parameters of spray drying process including moisture content (Y1), hygroscopicity (Y2), powder yield (Y3). Three factors three level Box–Behnken response surface design (BBD) was used to evaluate the effect of process variables on spray drying process. 3D Response surface contour plots were used to study the interactive effects of the process conditions and optimal spray drying conditions were determined as follows: inlet air temperature of 130 °C, feed flow rate of 6 rpm and aspirator rate of 100%. Under these conditions, moisture content, hygroscopicity and powder yield are found to be 6.85%, 19.85 g/100 g and 14.95 g respectively

Microwave assisted extraction process of betalain from dragon fruit and its antioxidant activities

The aim of this research was to optimize the operating parameters in microwave assisted extraction process (MIE) such as temperature, mass of the sample, extraction time on the betalain content from dragon fruit peel using response surface methodology (RSM). Three factors three levels Box-Behnken response surface design (BBD) was used for optimization and mathematical model development. Significant quadratic polynomial model was obtained (R2 = 0.9892 for betalain content) with high coefficient determination value and numerical optimization was employed to achieve optimum conditions which was found to be; temperature of 35 °C, mass of the sample of 20 g, and treatment time of 8 min. Under these conditions, 9 mg/L of betalain content was obtained and it was validated using experimental values

Performance evaluation of chemical coagulation process to treat bagasse wastewater: modeling and optimization

In this present study, chemical coagulation process (CC) treatment process was investigated under different conditions such as pH, ferric chloride dose, agitation time and settling time to treat bagasse wastewater using response surface methodology (RSM). The outcomes were evaluated using Pareto analysis of variance (ANOVA) and second order polynomial models were created with the aim of being able to predict the responses. Ideal conditions were observed to be as per the following: agitation time of 25 min, pH of 7, ferric chloride dose of 6 g/L and settling time of 60 min. Under these conditions, turbidity removal of 62%, COD removal of 67%, TDS removal 53% and sludge production of 32 mL/L were obtained with operating cost of 3.50 Rupee/L. The mechanism of CC was analyzed using XRD spectrum and founds to be adsorption

Performance evaluation of chemical coagulation process to treat bagasse wastewater : modeling and optimization

In this present study, chemical coagulation process (CC) treatment process was investigated under different conditions such as pH, ferric chloride dose, agitation time and settling time to treat bagasse wastewater using response surface methodology (RSM). The outcomes were evaluated using Pareto analysis of variance (ANOVA) and second order polynomial models were created with the aim of being able to predict the responses. Ideal conditions were observed to be as per the following: agitation time of 25 min, pH of 7, ferric chloride dose of 6 g/L and settling time of 60 min. Under these conditions, turbidity removal of 62%, COD removal of 67%, TDS removal 53% and sludge production of 32 mL/L were obtained with operating cost of 3.50 Rupee/L. The mechanism of CC was analyzed using XRD spectrum and founds to be adsorption