Adding Value to Olive Oil Production Through Waste and Wastewater Treatment and Valorisation: The Case of Greece

Valta, Katerina; Aggeli, E.; Papadaskalopoulou, Christina; Panaretou, V.; Sotiropoulos, A.; Malamis, Dimitris; Μουστάκας, Κωνσταντίνος; Haralambous, K.J.

doi:10.1007/s12649-015-9373-4

Cited by 26 publications

(10 citation statements)

References 33 publications

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“…Phenolic compounds derived from olive pomace are the bioactive compounds of interest in this study. Olive pomace comprises the main solid by-product of olive oil production, which is commonly utilized for olive pomace oil production, as combustible material, as animal feed, or it is directly disposed of into the environment without previous pretreatment [ 20 ]. Olive pomace is an interesting source of phenolic compounds, since only 1–2% of the total content of the phenolic compounds of olives goes into olive oil through its mechanical extraction production process (centrifugation of oil paste), while 53% and 45% of them remain in the liquid waste and the solid by-product (olive pomace), respectively [ 12 ].…”

Section: Valorization Of Olive Pomacementioning

confidence: 99%

Novel Processes for the Extraction of Phenolic Compounds from Olive Pomace and Their Protection by Encapsulation

2021

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Olive pomace, the solid by-product derived from olive oil production consists of a high concentration of bioactive compounds with antioxidant activity, such as phenolic compounds, and their recovery by applying innovative techniques is a great opportunity and challenge for the olive oil industry. This study aimed to point out a new approach for the integrated valorization of olive pomace by extracting the phenolic compounds and protecting them by encapsulation or incorporation in nanoemulsions. Innovative assisted extraction methods were evaluated such as microwave (MAE), homogenization (HAE), ultrasound (UAE), and high hydrostatic pressure (HHPAE) using various solvent systems including ethanol, methanol, and natural deep eutectic solvents (NADESs). The best extraction efficiency of phenolic compounds was achieved by using NADES as extraction solvent and in particular the mixture choline chloride-caffeic acid (CCA) and choline chloride-lactic acid (CLA); by HAE at 60 °C/12,000 rpm and UAE at 60 °C, the total phenolic content (TPC) of extracts was 34.08 mg gallic acid (GA)/g dw and 20.14 mg GA/g dw for CCA, and by MAE at 60 °C and HHPAE at 600 MPa/10 min, the TPC was 29.57 mg GA/g dw and 25.96 mg GA/g dw for CLA. HAE proved to be the best method for the extraction of phenolic compounds from olive pomace. Microencapsulation and nanoemulsion formulations were also reviewed for the protection of the phenolic compounds extracted from olive pomace. Both encapsulation techniques exhibited satisfactory results in terms of encapsulation stability. Thus, they can be proposed as an excellent technique to incorporate phenolic compounds into food products in order to enhance both their antioxidative stability and nutritional value.

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Section: Valorization Of Olive Pomacementioning

confidence: 99%

Novel Processes for the Extraction of Phenolic Compounds from Olive Pomace and Their Protection by Encapsulation

2021

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“…The effluent highest concentrations of biological oxygen demand (BOD) and chemical oxygen demand (COD) might reach 100 and 220 g/L, respectively [40], with high COD/BOD 5 ratio between 2-5 [4,30,41]. The chemical-physical properties of OMWW depend on olive cultivar, cultural practices, maturity (ripening stage of the olives), climate conditions, olive storage and oil production system [4,20,35,36,[42][43][44][45][46] The aromatic, long-chain fatty acids and polyphenolic compounds with concentration up to 80 g/L are considered the major factors related to OMWW pollution characteristics because they are toxic to soil microorganisms and plants [47][48][49] and considered the most polluting waste generated by the agri-food industries [50][51][52]. Phenolic compounds are initially produced by the olive trees and developed later during the oil extraction processes [7].…”

Section: Olive Oil Processing Systems and By-products Characteristicsmentioning

confidence: 99%

Sustainable Environmental Management and Valorization Options for Olive Mill Byproducts in the Middle East and North Africa (MENA) Region

2020

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Cultivation of olive trees and olive oil production have been considered as a legacy for the Mediterranean region. This custom represents a very important benefit for many nations in terms of wealth and health. However, huge amounts of by-products and waste are generated during olive oil production. This represents a serious environmental impact on land and water bodies if not properly handled. Olive oil extraction generates two waste streams, a solid waste called pomace and olive mill wastewater (OMWW), which has been considered as highly pollutant and phytotoxic waste. These wastes have high disposal costs and predominantly generated from small-scale enterprises that have limited financial resources to treat them properly before discharge to the environment. Besides being a serious environmental problem, OMWW has potential economic value that remains to be utilized such as: fertilizers, valuable antioxidants agents and fatty acids needed in human diet. Also, Olive pomace is a valuable renewable energy source with an energy density of 23 MJ/kg and has become an inexpensive alternative for fossil fuels. Aiming at adding value to the olive production sectors and potential valorization options for byproducts in the MENA region, international practices applied in olive mills wastes management’s and treatment methods used in major oil producing countries are presented.

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“…Ash from orujillo has been widely used as fertilizer because of its high potassium content [40]. In fact, y ash from these kinds of plants have been usually sold to fertilizer companies.…”

Section: Ash Applicationsmentioning

confidence: 99%

Effect Of Exhausted Olive Cake Contamination On Fly And Bottom Ash In Power Plants

Pazo

Lapuerta

Acosta

et al. 2021

Preprint

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With the aim to prevent possible power plant malfunction due to the feedstock properties and suggest possible ash applications, feedstock samples and bottom and fly ash samples collected along more than a year in a 16 MW suspension-fired boiler power plant, fed mainly with pulverized exhausted olive cake (orujillo), were studied. A detailed characterization of fly and bottom ash has been done, as well as a seasonal evolution study. Altogether in order to find any trend on the ash composition changes and to study the relationship between ash (both fly and bottom fractions) and, on the one hand, the feedstock composition, and on the other hand, the troublesome deposit formation. A relationship between deposit growth and higher Cl and Na content in the feedstock has been noticed, showing the need for some control on these feedstock’s components. The high Cl and Na content is attributed to external contamination. Furthermore, the high Al content in the feedstock and the strong relationship between Al, Fe and Si (indicating a common origin) suggest some biomass soil contamination. However, no relationship was observed between troublesome deposit formation and the hypothesized biomass soil contamination.

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Adding Value to Olive Oil Production Through Waste and Wastewater Treatment and Valorisation: The Case of Greece

Cited by 26 publications

References 33 publications

Novel Processes for the Extraction of Phenolic Compounds from Olive Pomace and Their Protection by Encapsulation

Novel Processes for the Extraction of Phenolic Compounds from Olive Pomace and Their Protection by Encapsulation

Sustainable Environmental Management and Valorization Options for Olive Mill Byproducts in the Middle East and North Africa (MENA) Region

Effect Of Exhausted Olive Cake Contamination On Fly And Bottom Ash In Power Plants

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