Circular economy in olive oil production – Olive mill solid waste to ethanol and heavy metal sorbent using microwave pretreatment

The olive oil production is an important industrial sector in many Mediterranean areas, but it is currently struggled by the necessity of a proper valorisation of the olive mill solid waste or alperujo. The alperujo is the main by-product generated during the two-phase olive oil extraction, accounting for up to 80% of the initial olive mass. The alperujo is a source of valuable compounds, such as the pomace olive oil or highly interesting phenolic compounds. In the present research, a novel biorefinery approach has been used for phenolic compounds recovery. However, the extraction of these valuables compounds generates different exhausted phases with high organic matter content that are required to be managed. This study consists of the evaluation of the anaerobic biodegradability of the different fractions obtained in a novel biorefinery approach for the integral valorisation of alperujo. The results show that the different phases obtained during the biorefinery of the alperujo can be effectively subjected to anaerobic digestion and no inhibition processes were detected. The highest methane yield coefficients were obtained for the phases obtained after a two-months storages, i.e., suspended solids and liquid phase free of suspended solids, which generated 366 ± 7 mL CH4/g VS and 358 ± 6 mL CH4/g VS, respectively. The phenol extraction process reduced the methane yield coefficient around 25% due to the retention of biodegradable compounds during the extraction process. Regardless of this drop, the anaerobic digestion is a suitable technology for the stabilization of the different generated residual phases, whereas the high market price of the extracted phenols can largely compensate the slight decrease in the methane generation.

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Production of biochar from olive mill solid waste for heavy metal removal

Bioresource Technology ◽

10.1016/j.biortech.2017.08.013 ◽

2017 ◽

Vol 244 ◽

pp. 759-767 ◽

Cited By ~ 35

Author(s):

Samya O. Abdelhadi ◽

Carlos G. Dosoretz ◽

Giora Rytwo ◽

Yoram Gerchman ◽

Hassan Azaizeh

Keyword(s):

Heavy Metal ◽

Solid Waste ◽

Metal Removal ◽

Heavy Metal Removal ◽

Olive Mill Solid Waste ◽

Olive Mill

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Influence of hydrothermal pretreatment conditions, typology of anaerobic digestion system, and microbial profile in the production of volatile fatty acids from olive mill solid waste

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105055 ◽

2021 ◽

Vol 9 (2) ◽

pp. 105055

Author(s):

Yasmim Arantes da Fonseca ◽

Nayara Clarisse Soares Silva ◽

Adonai Bruneli de Camargos ◽

Silvana de Queiroz Silva ◽

Hector Javier Luna Wandurraga ◽

...

Keyword(s):

Fatty Acids ◽

Anaerobic Digestion ◽

Solid Waste ◽

Volatile Fatty Acids ◽

Hydrothermal Pretreatment ◽

Microbial Profile ◽

Olive Mill Solid Waste ◽

Pretreatment Conditions ◽

Olive Mill

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Enhancing methane production from the invasive macroalga Rugulopteryx okamurae through anaerobic co-digestion with olive mill solid waste: process performance and kinetic analysis

Journal of Applied Phycology ◽

10.1007/s10811-021-02548-3 ◽

2021 ◽

Author(s):

D. de la Lama-Calvente ◽

M. J. Fernández-Rodríguez ◽

J. Llanos ◽

J. M. Mancilla-Leytón ◽

R. Borja

Keyword(s):

Anaerobic Digestion ◽

Solid Waste ◽

Methane Production ◽

Methane Yield ◽

Specific Rate ◽

Order Kinetic ◽

Two Phase ◽

First Order ◽

Olive Mill Solid Waste ◽

Olive Mill

AbstractThe biomass valorisation of the invasive brown alga Rugulopteryx okamurae (Dictyotales, Phaeophyceae) is key to curbing the expansion of this invasive macroalga which is generating tonnes of biomass on southern Spain beaches. As a feasible alternative for the biomass management, anaerobic co-digestion is proposed in this study. Although the anaerobic digestion of macroalgae barely produced 177 mL of CH4 g−1 VS, the co-digestion with a C-rich substrate, such as the olive mill solid waste (OMSW, the main waste derived from the two-phase olive oil manufacturing process), improved the anaerobic digestion process. The mixture improved not only the methane yield, but also its biodegradability. The highest biodegradability was found in the mixture 1 R. okamurae—1 OMSW, which improved the biodegradability of the macroalgae by 12.9% and 38.1% for the OMSW. The highest methane yield was observed for the mixture 1 R. okamurae—3 OMSW, improving the methane production of macroalgae alone by 157% and the OMSW methane production by 8.6%. Two mathematical models were used to fit the experimental data of methane production time with the aim of assessing the processes and obtaining the kinetic constants of the anaerobic co-digestion of different combination of R. okamurae and OMSW and both substrates independently. First-order kinetic and the transference function models allowed for appropriately fitting the experimental results of methane production with digestion time. The specific rate constant, k (first-order model) for the mixture 1 R. okamurae- 1.5 OMSW, was 5.1 and 1.3 times higher than that obtained for the mono-digestion of single OMSW and the macroalga, respectively. In the same way, the transference function model revealed that the maximum methane production rate (Rmax) was also found for the mixture 1 R. okamurae—1.5 OMSW (30.4 mL CH4 g−1 VS day−1), which was 1.6 and 2.2 times higher than the corresponding to the mono-digestions of the single OMSW and sole R. okamurae (18.9 and 13.6 mL CH4 g−1 VS day−1), respectively.

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Intergraded Applied Methodology for the Treatment of Heavy Polluted Waste Waters from Olive Oil Industries

Applied and Environmental Soil Science ◽

10.1155/2011/537814 ◽

2011 ◽

Vol 2011 ◽

pp. 1-14 ◽

Cited By ~ 5

Author(s):

Antonis A. Zorpas ◽

Vassilis J. Inglezakis

Keyword(s):

Olive Oil ◽

Oil Production ◽

Olive Mill Wastewater ◽

Fenton Process ◽

Waste Waters ◽

Warm Climate ◽

Climate Conditions ◽

Integrated Method ◽

Third Stage ◽

Olive Mill

The annual olive oil production in Cyprus is in the range of 2700–3100 t y−1, resulting in the generation of significant amount of waste. The cocomposting of the olive oil solid residue (OOSR) and the treated wastewaters (with Fenton) from the olive oil production process with the application of reed beds has been studied as an integrated method for the treatment of wastewater containing high organic and toxic pollutants under warm climate conditions. The experimental results indicated that the olive mill wastewater (OMW) is detoxified at the end of the Fenton process. Specifically, COD is reduced up to 65% (minimum 54.32%) by the application of Fenton and another 10–28% by the application of red beds as a third stage. The final cocomposted material of OOSR with the treated olive mile wastewater (TOMW) presents optimum characteristics and is suitable for agricultural purpose.

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Mesophilic anaerobic co-digestion of cow manure with three-phase olive mill solid waste

Energy Sources Part A Recovery Utilization and Environmental Effects ◽

10.1080/15567036.2018.1549157 ◽

2018 ◽

Vol 41 (15) ◽

pp. 1800-1808 ◽

Cited By ~ 5

Author(s):

Rafat Al Afif ◽

Thomas Amon

Keyword(s):

Solid Waste ◽

Cow Manure ◽

Three Phase ◽

Olive Mill Solid Waste ◽

Olive Mill

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SYNTHESIS AND CHARACTERIZATION OF GREENER CERAMIC MATERIALS WITH LOWER THERMAL CONDUCTIVITY USING OLIVE MILL SOLID BYPRODUCT

EUREKA Physics and Engineering ◽

10.21303/2461-4262.2020.001116 ◽

2020 ◽

Vol 1 ◽

pp. 96-106 ◽

Cited By ~ 1

Author(s):

Xenofon Spiliotis ◽

Vayos Karayannis ◽

Stylianos Lamprakopoulos ◽

Konstantinos Ntampegliotis ◽

George Papapolymerou

Keyword(s):

Thermal Conductivity ◽

Solid Waste ◽

Energy Savings ◽

Sintering Temperature ◽

Ceramic Body ◽

Ceramic Materials ◽

Raw Material ◽

Gravimetric Analysis ◽

Olive Mill Solid Waste ◽

Olive Mill

In the current research, the valorization of olive mill solid waste as beneficial admixture into clay bodies for developing greener ceramic materials with lower thermal conductivity, thus with increased thermal insulation capacity towards energy savings, is investigated. Various clay/waste mixtures were prepared. The raw material mixtures were characterized and subjected to thermal gravimetric analysis, in order to optimize the mineral composition and maintain calcium and magnesium oxides content to a minimum. Test specimens were formed employing extrusion and then sintering procedure at different peak temperatures. Apparent density, water absorption capability, mechanical strength, porosity and thermal conductivity were determined on sintered specimens and examined in relation to the waste percentage and sintering temperature. The experimental results showed that ceramic production from clay/olive-mill solid waste mixtures is feasible. In fact, the mechanical properties are not significantly impacted with the incorporation of the waste in the ceramic body. However, the thermal conductivity decreases significantly, which can be of particular interest for thermal insulating materials development. Furthermore, the shape of the produced ceramics does not appear to change with the sintering temperature increase.

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