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−1 for 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%.
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Research Article|
October 11 2016
Eco-friendly process combining physical–chemical and biological technics for the fermented dairy products waste pretreatment and reuse
Mariam Kasmi;
1Laboratory of Wastewater Treatment, Water Researches and Technologies Center(CERTE), University of Carthage, Tourist route, Soliman, BP 273-8020, Tunisia
E-mail: [email protected]
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Moktar Hamdi;
Moktar Hamdi
2Laboratoire 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
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Ismail Trabelsi
Ismail Trabelsi
1Laboratory of Wastewater Treatment, Water Researches and Technologies Center(CERTE), University of Carthage, Tourist route, Soliman, BP 273-8020, Tunisia
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Water Sci Technol (2017) 75 (1): 39–47.
Article history
Received:
May 31 2016
Accepted:
September 28 2016
Citation
Mariam Kasmi, Moktar Hamdi, Ismail Trabelsi; Eco-friendly process combining physical–chemical and biological technics for the fermented dairy products waste pretreatment and reuse. Water Sci Technol 9 January 2017; 75 (1): 39–47. doi: https://doi.org/10.2166/wst.2016.477
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