Adding Value to Olive Oil Production Through Waste and Wastewater Treatment and Valorisation: The Case of Greece
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Nowadays, an increasing trend towards olive oil production is observed globally. The extraction of olive oil is mostly implemented through three-phase or two-phase centrifuge systems. Olive pomace, derived as a by-product of olive oil processing, constitutes a raw material for olive–pomace oil production. The operation of olive oil mills and olive–pomace industries has been connected with the generation of heavily polluted wastewater and solid waste. The present paper aims at investigating the current treatment methods and techniques applied for the management of the wastewater and solid waste generated by olive oil (including olive–pomace oil) production in Greece. Aiming at adding value to the Greek olive production process, international practices applied for solid waste and wastewater treatment as well as potential valorisation options are reviewed within this paper. The results reveal that there is room for improvement in wastewater treatment in Greece, since the currently applied method, i.e. oil removal, neutralisation, sedimentation and evaporation in open lagoons, comprises only a basic—level treatment technique. Concerning solid waste management, attention must be paid to the use of sludge produced from the evaporation ponds, since its application as soil improver without appropriate treatment may entail diverse toxic effects to soils. Regarding solid waste valorisation, pomace handling is thoroughly exploited in Greece, since it is utilised for the production of olive–pomace oil and pomace wood. Other valorisation opportunities, identified in the literature, include production of biomolecules as well as cosmetic products, dyes, construction materials and water decontamination sorbents. However, more work is needed in order to maximise the economic feasibility and applicability of such practices.
KeywordsOlive oil Olive pomace oil Pomace wood Pomace Centrifuge Waste Wastewater Greece
The authors would like to thank the European Social Fund and the Hellenic Ministry of Education and Religious Affairs, Cultures and Sports (Managing Authority) for funding the project: FOODINBIO/2915 entitled “Development of an innovative, compact system that combines biological treatment technologies for the sustainable and environmental management of organic waste streams that are produced from different types of food processing industries”, in the framework of the Operational Programme Educational and Lifelong Learning (NSRF 2007–2013).
- 1.International Olive Council: World olive oil figures. http://www.internationaloliveoil.org/estaticos/view/131-world-olive-oil-figures
- 2.BIC: Sectoral study for olive oil and olive-pomace oil. Athens (2012)Google Scholar
- 4.Alexakis Chr.: Study for the feasibility of the development of stock market for goods and sailing values in the City of Piraeus, commercial and industrial chamber of Piraeus (2013)Google Scholar
- 5.Syvilla Ltd: Overview—presentation of the existing situation in Greece, inventory and presentation of the treatment and disposal technologies (2007)Google Scholar
- 6.Ministerial Decision (MD) 1958/12 on the classification of projects and activities into categories/subcategories on the basis of their potential impact on the environment (Government Gazette B/21/2012)Google Scholar
- 7.Greek Joint Ministerial Decision (JMD) 15/4187/266/11.04.2012 on the standard environmental commitments (SEC) of industrial activities (Government Gazette B 1275/B/11.4.2012)Google Scholar
- 8.Official Document (12550/744/F15/2.11.2012) on general guidelines for implementation of the condition E3 of JMD 15/4187/266/11.04.2012 issued by the general secretariat for industry and the general secretariat for environmentGoogle Scholar
- 9.Zaharaki, D., Komnitsas, K.: Existing and emerging technologies for the treatment of olive oil mill wastewaters. In: 3rd AMIREG International Conference 2009: assessing the footprint of resource utilization and hazardous waste management. Athens, GreeceGoogle Scholar
- 18.Najar-Souissi, S., Ouederni, A., Ratel, A.: Adsorption of dyes onto activated carbon prepared from olive stones. J. Environ. Sci. 17, 998–1003 (2005)Google Scholar