Application of Hessian Matrix to Optimize Coagulation Treatment of Tannery Industry Wastewater Using Salt Solution Extracted Moringa oleifera Seeds Protein Coagulant

摘要

The coagulation process using NaCl and KCl salt solution extracted protein from Moringa oleifera seeds is reported for tannery wastewater treatment in the present study. The important process parameters coagulant dosage and pH were optimized using Hessian matrix approach. Central composite design employing coagulant dose and pH as input variables was considered for developing response surface models for colour (%) and turbidity (%) removal. The dosage 45 mL and pH 7 was found to be optimum conditions for maximum 84 % colour removal by NaCl extracted coagulant, whereas for KCl extracted coagulant optimal point was 46.1 mL dosage and pH 6.9. For turbidity (%) removal using NaCl extracted coagulant the optimum condition was 40.2 mL dosage and pH 7.5. The removal efficiency of NaCl extracted coagulant was more than KCl extracted coagulant suggesting that NaCl salt solution is more effective in extracting the active agent from Moringa oleifera seeds.