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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Biological Degradation of Olive Mill Solid Wastes Produced from Olive Oil Extraction
by Awni Khatib, Fathi Aqra and Nader Yaghi

Olive mill solid waste (OMSW) has a potential to cause pollution either in land or in water. In order to reduce this problem, a study was conducted to investigate the effect of microbes on the treatment of this waste. The context of this work was to solve this environmental problem by recycling of OMSW, by a composting system that was carried out by a thermophilic process in which the microorganisms (Psychrophiles, Mesophiles and thermophiles) were responsible for the composting process. This project addresses reducing the environmental impact of Olive Mill Solid Waste, called jift, produced from olive oil extraction. A composting process was managed to solve or make progress on the problem by composting OMSW with cow manure. The method of research applied to the problem was based on the digestion of organic species available in OMSW by the microorganisms, through three stages. The results indicated that the first stage occurred at low temperature (below 20C) where simple compounds such as saccharides and polyunsaturated fatty acids were consumed. This stage produces energy (heat) and so accelerates the decomposition of fats and polyphenols by mesophiles, at medium temperature (20-40C). The third stage was the stabilization state, where the temperature became high (reached 65C) due to the previous process, and so, the thermophiles started digestion of all the remaining organic matters. After the completion of the third stage, the temperature of the system decreased slowly until it became 25C, indicating the consumption and decomposition of all the organic contents in the OMSW, by the three Kinds of microbes. The products, obtained from these processes, were carbon and nitrogen. The C/N ratio in the product was calculated which showed the complete degradation of the organic compounds. The significance of this work is that detoxification of OMSW to produces new substances that can be used in feeding animals and as natural soil conditioning, and to produce a new source for heat production. The implications for future work is to treat the OMSW by various methods because olive waste contains oil that may increase soil hydrophobicity and decrease water retention and infiltration rate.
Keywords: olive oil, olive mill solid waste, thermophillic process
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010