Optimization of electrocoagulation process to treat grey wastewater in batch mode using response surface methodology.

Background: Discharge of grey wastewater into the ecological system causes the negative impact effect on receiving water bodies.

Methods: In this present study, electrocoagulation process (EC) was investigated to treat grey wastewater under different operating conditions such as initial pH (4-8), current density (10-30 mA/cm2), electrode distance (4-6 cm) and electrolysis time (5-25 min) by using stainless steel (SS) anode in batch mode. Four factors with five levels Box-Behnken response surface design (BBD) was employed to optimize and investigate the effect of process variables on the responses such as total solids (TS), chemical oxygen demand (COD) and fecal coliform (FC) removal.

Model development and process optimization for solvent extraction of polyphenols from red grapes using Box-Behnken design.

The objective of the present study is to find out the optimum extraction conditions for extraction of polyphenols from red grapes using Box-Behnken design. Red grapes polyphenols were extracted using acid-ethanol solvent at various extraction temperature (40-60°C), extraction time (20-100 min) and different solid-liquid ratio (1:5-1:15 g:ml). The effect (main and interactive) of extraction conditions on total anthocyanin, phenolic and flavonoid content were studied using Box-Behnken design (three factors at three levels).