Optimisation of biological wastewater treatment for yeast processing effluent using cultured bacteria: Application of response surface methodology

Abstract

In the present study, the interactive effects of temperature and cultured bacteria on the performance of a biological treatment system of wastewater from a local yeast producing plant were investigated. The main objective of this study was to optimize the operating parameters that reduce organic load and colour. Biological treatment was conducted using a Central Composite Design (CCD) and optimised using Response Surface Methodology (RSM) on Design Expert 7 software. Two dependent variables namely, Chemical Oxygen Demand (COD) removal and colour reduction were studied. COD removal efficiency of 26% and decolourization efficiency of 44% were recorded for the wastewater treatment. The optimised conditions for the biological treatment were found to be at 16.37 g/l of bacterial powder at 25°C for COD removal and colour reduction. The optimised parameters can be used for biological treatment of yeast plant effluent for removal of organic load and colour.

Application of Composite Pre-Polymerized Coagulants for the Treatment of High-Strength Industrial Wastewaters

“…In addition, the coagulation-flocculation process has received greater attention, as it has been proven to be effective for the removal of various contaminants which may include toxic organic matter, heavy metals, viruses, etc. Due to the fact of its high-efficiency for the removal of contaminants, this process has been extensively applied (among other applications) for the treatment of leather industrial wastewater [14], palm oil mill effluent [15,16], food and beverage wastewater [8,9], textile wastewater [17], yeast wastewater [18], industrial wastewaters, etc. Traditionally, common inorganic metal salts, such as ferric chloride or aluminum sulfate, are widely used for industrial wastewater treatment.…”