title: Eco-friendly process combining physical-chemical and biological technics for the fermented dairy products waste pretreatment and reuse.
abstract: Residual fermented dairy products resulting from process defects or from expired shelf life products are considered as waste. Thus, dairies wastewater treatment plants (WWTP) suffer high input effluents polluting load. In this study, fermented residuals separation from the plant wastewater is proposed. In the aim to meet the municipal WWTP input limits, a pretreatment combining physical-chemical and biological processes was investigated to reduce residual fermented dairy products polluting effect. Yoghurt (Y) and fermented milk products (RL) were considered. Raw samples chemical oxygen demand (COD) values were assessed at 152 and 246 g.L-1for Y and RL products, respectively. Following the thermal coagulation, maximum removal rates were recorded at 80 °C. Resulting whey stabilization contributed to the removal rates enhance to reach 72% and 87% for Y and RL samples; respectively. Residual whey sugar content was fermented using Candida strains. Bacterial growth and strains degrading potential were discussed. C. krusei strain achieved the most important removal rates of 78% and 85% with Y and RL medium, respectively. Global COD removal rates exceeded 93%.
authors.affiliation: Laboratory of Wastewater Treatment, Water Researches and Technologies Center(CERTE), University of Carthage, Tourist route, Soliman, BP 273-8020, Tunisia E-mail: kasmimariam@gmail.com.
authors.forename: Mariam
authors.initials: M
authors.lastname: Kasmi
authors.affiliation: Laboratoire d'Ecologie et de Technologie Microbienne LETMI, Institut National des Sciences Appliquées et de Technologie (INSAT), Centre Urbain Nord, Tunis Cedex BP 676-1080, Tunisia.
authors.forename: Moktar
authors.initials: M
authors.lastname: Hamdi
authors.affiliation: Laboratory of Wastewater Treatment, Water Researches and Technologies Center(CERTE), University of Carthage, Tourist route, Soliman, BP 273-8020, Tunisia E-mail: kasmimariam@gmail.com.
authors.forename: Ismail
authors.initials: I
authors.lastname: Trabelsi
mesh_terms: D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D043302:Cultured Milk Products; D005285:Fermentation; D019649:Food Industry; D007220:Industrial Waste; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism
chemical_list: D007220:Industrial Waste; D062065:Wastewater; D014874:Water Pollutants, Chemical