Hydrothermal gasification of olive mill wastewater as a biomass source in supercritical water

Kıpçak, Ekin; Söğüt, Onur Ö.; Akgün, Mesut

doi:10.1016/j.supflu.2011.02.006

Cited by 62 publications

(17 citation statements)

References 33 publications

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“…OMWW has a very complex nature characterized by a high chemical and biochemical oxygen demand (approximately 100-200g/L of COD and 15 to 135g/L of BOD) (Günay, et al, 2013).The dark color of this waste depends on the age and type of olive processed and also the technology used. It is generally composed of olive fruit's water content, soft pulp tune in emulsified oil (soft tissues from the olive pulp), and water which is used to wash the various stages of the oil extraction process (Kıpçak, et al, 2011). In order to treat OMWW, different biochemical/biotechnical methods and thermochemical methods have been used, such as direct combustion (Miranda, et al, 2007), pyrolysis (Guida, et al, 2016;Vitolo, et al, 1999), gasification (Kıpçak, et al, 2011), etc.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal liquefaction of oil mill wastewater for bio-oil production in subcritical conditions

Hadhoum

Balistrou

Burnens

et al. 2016

Bioresource Technology

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:The main purpose of this study is to investigate the direct hydrothermal liquefaction of oil mill wastewater (OMWW). Experiments were carried out at different temperatures (240-300 _C), water contents (58-88 wt.%) and reaction times (15-45 min). Results show that the highest bio-oil yield was about 58 wt.%, resulting in a higher heating value of 38 MJ/kg. This was conducted at the following optimal conditions: water content 88 wt.%, a temperature of 280 _C, and 30 min as reaction time. To put bio-oil into wide application, the various physical and chemical characteristics were determined. A detailed chemical composition analysis of bio-oil was performed by gas chromatography-mass spectrometry (GC-MS) coupled with a flame ionization detector (FID). The dominant compounds were identified by using NIST library. Analyses show that the bio-oil contains mainly oleic acid, hexadecanoic acid, fatty acid methyl ester, fatty acid ethyl ester, amino acid derived compounds and phenolic compounds.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal liquefaction of oil mill wastewater for bio-oil production in subcritical conditions

Hadhoum

Balistrou

Burnens

et al. 2016

Bioresource Technology

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“…This ensures good transport properties and rapid reaction kinetics 19–21. In addition, the dielectric constant decreases sharply in this region and water behaves like a nonpolar molecule that is able to dissolve the organic compounds found in aqueous streams 22. Therefore, char formation is suppressed when gasification takes place in supercritical water 23–27.…”

Section: Introductionmentioning

confidence: 99%

Gasification of Microalgae Using Supercritical Water and the Potential of Effluent Recycling

et al. 2016

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The gasification of microalgae in supercritical water was investigated in this work. The product gas contained mainly H2, CO2, CH4, and C2H6. Operation at high temperatures and lower biomass concentrations resulted in the highest carbon gasification efficiency and the lowest total organic carbon levels in the residual water. Due to its content of inorganic nutrients, the residual water was applied as cultivation medium for microalgae. However, algal growth in the untreated residual water was inhibited by the existence of potentially toxic substances evolved from gasification. Upon treatment by activated carbon filtration and ultraviolet light degradation, these substances were eliminated and cultivation in the residual water was possible. The major fraction of inorganic residues from gasification was recovered by means of water purging, increasing the potential of nutrient recycling for cultivation.

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“…Regular annual OMW production is estimated around 10 to 30 million m 3 . Production levels may vary depending on olive oil extraction method, cultivation soil, use of pesticides and fertilizers, olive harvesting time, degree of ripening, duration of aging, olive variety and weather conditions [35,36]. Typical OMW composition by weight is 83-96% water, 3.5-15% organic compounds and 0.5-2% mineral salts.…”

Section: Introductionmentioning

confidence: 99%

Energy Production by Hydrothermal Treatment of Liquid and Solid Waste from Industrial Olive Oil Production

Lanzat

Jarana

Chen

et al. 2016

J. Appl. Sol. Chem. Model.

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This work studies the use of olive oil mill waste (OMW) treated as subcritical or supercritical water to produce both, a biofuel by liquefaction and a gas fuel by gasification. The increasing amount of OMW, both liquid and solid, is becoming a serious environmental problem. This wastewater is highly resistant to biodegradation and contains a wide variety of compounds such as polyphenols, polyoils, organic acids, etc, that require depuration treatments to remove the odour and pollutant load before being discharged. This work studies both, liquefaction and gasification of OMW streams in subcritical and supercritical water in different batch reactors at temperatures between 200 and 530 ºC and pressures between 150 and 250 bar. This study also tests the effectiveness of various types of homogeneous (KOH 0.01 g/gsample dry) and heterogeneous catalysts (TiO2, V2O5 and Au-Pd 0.1-0.5 g/gsample dry) for supercritical water gasification (SCWG) and studied the way they affect biomass conversion yields. It also covers the effect that the use of different organic compound concentrations (23, 35, and 80 g O2/l of chemical oxygen demand concentration (COD)) and compositions (mixtures of solid and liquid OMW) has on energy production results. A maximum of 82% oil yield was obtained from the hydrothermal liquefaction of OMW under optimum conditions (330 ºC, 150 bar, 23 g O2/l as initial concentration and 30 minutes reaction time). Meanwhile, a yield of 88.6 mol H2/kgOMW dry was obtained when Au-Pd was used as a catalyst for the gasification of OMW supercritical water.

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Hydrothermal gasification of olive mill wastewater as a biomass source in supercritical water

Cited by 62 publications

References 33 publications

Hydrothermal liquefaction of oil mill wastewater for bio-oil production in subcritical conditions

Hydrothermal liquefaction of oil mill wastewater for bio-oil production in subcritical conditions

Gasification of Microalgae Using Supercritical Water and the Potential of Effluent Recycling

Energy Production by Hydrothermal Treatment of Liquid and Solid Waste from Industrial Olive Oil Production

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