Treatment of olive mill wastewater by supercritical water oxidation

Erkonak, Hiilya; Söğüt, Onur Ö.; Akgün, Mesut

doi:10.1016/j.supflu.2008.04.006

Cited by 72 publications

(32 citation statements)

References 22 publications

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“…Figure 10.2 shows that for this set of experiments, excess oxidant concentrations greater than a certain value (here, 400 %) has no significant effect on organics conversion ratio, which is already brought to 1 here; thus further increasing the excess oxygen results in unnecessary costs without bringing any technical benefits. As expected regarding to excess oxygen use, the rate expressions obtained through kinetic experiments show that the reaction orders for oxidant have positive values close to zero [42][43][44][45].…”

Section: Initial Oxidant Concentrationsupporting

confidence: 77%

“…Experiments [42] conducted at various initial oxygen concentrations (all in excess) show that the initial oxygen concentrations are effective on organics conversion, which is shown here in terms of total organic carbon concentrations (TOC). Figure 10.2 shows that for this set of experiments, excess oxidant concentrations greater than a certain value (here, 400 %) has no significant effect on organics conversion ratio, which is already brought to 1 here; thus further increasing the excess oxygen results in unnecessary costs without bringing any technical benefits.…”

Section: Initial Oxidant Concentrationmentioning

confidence: 83%

“…The positive effect of temperature is notable for wastewater treatment both oxidation and non-oxidative decomposition reactions in SCWO reactors [42][43][44]. TOC conversions achieved by two different initial oxidant concentrations, and various reactor temperatures at olive mill wastewater treatment with SCWO [42] is shown in Fig. 10.4.…”

Section: Temperaturementioning

confidence: 97%

“…Temperature in a reactor determines the kinetic energy, linear velocity and effective collision probabilities of molecules, thus the rate constants; and the most affordable reaction mechanism amongst various other possible paths according the activation energies, and in consequence the variety and concentrations of ultimate products [41,42].…”

Section: Temperaturementioning

confidence: 99%

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Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Akgün

Söğüt

2014

Biofuels and Biorefineries

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Water behaves as an acidic and alkaline precursor for acidic or basic reactions, since the formation of both H 3 O C and OH -ions takes place in accordance with the self-dissociation of water at near-critical and above supercritical (T c D 374 ı C, P c D 22.1 MPa) conditions. Therefore, supercritical water is considered both as a solvent for organic materials and as a reactant at processes such as the oxidative treatment of wastewaters, the gasification of aqueous organic solutions and the production of fine metal oxide particles. Supercritical water oxidation is a very efficient method for wastewater treatment, which is based on oxidation of organic compounds in aqueous media above critical temperature and pressure conditions of pure water.In this chapter, general information on supercritical water oxidation processes is given, effects of operational parameters such as temperature, pressure, reaction time, waste and oxidant concentration on waste treatment are discussed, and applied scientific methods and practical solutions to possible operational problems such as corrosion, salt deposition and carbonization are compiled in detail. Treatment of industrial wastewaters such as olive mill, textile dyehouse, cheese whey and commercial pesticide with high environmental hazard potential are subjected and evaluated in order to understand the effects of reactor temperature, organics and oxidant concentrations, residence time and reactor pressure. Hydrothermal degradation and oxidation kinetics of wastewater are stracked in terms of total organic carbon (TOC) and analyzed, followed by discussion of supercritical water oxidation rate models.

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Section: Initial Oxidant Concentrationsupporting

confidence: 77%

Section: Initial Oxidant Concentrationmentioning

confidence: 83%

Section: Temperaturementioning

confidence: 97%

Section: Temperaturementioning

confidence: 99%

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Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Akgün

Söğüt

2014

Biofuels and Biorefineries

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“…The fundamental role of temperature is to afford necessary heat of decomposition to fragment biomass linkages. At relatively lower temperature, between 65 and 180 °C, biomass loses its moisture, generates non-combustible gases like CO2 and undergoes depolymerisation reactions involving no significant carbohydrate loss [66][67][68][69][70][71]. Chemical bonds preconditioned in the main constituents of biomass sample begin to break at temperatures higher than approximately 200 °C.…”

Section: Temperaturementioning

confidence: 99%

A review on thermochemical treatment of biomass: Pyrolysis of olive mill wastes in comparison with other types of biomass

Guida

Hannioui

2016

Progress in Agricultural Engineering Sciences

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Abstract. Each year, a great quantity of olive oil is produced by the unit mill of trituration. This activity generates two by-products named olive mill wastewater and olive mill solid waste representing major potential waste and environmental problem. However, there is growing interest in pyrolysis as a technology to treat wastes to produce valuable oil, char and gas products. The major important aim of waste pyrolysis is to produce liquid fuel or bio-oil, which is easy to store, transport and can be an alternative to energy source. The key influence on the product yield is the type of biomass feedstock and operating parameters (especially temperature and heating rate). It is important to investigate the effect of variables on response yield and impulse about their optimization. This study reviews operating variable from existing literature on olive mill wastes (OMSW and OMWW) in comparison with various types of biomass. The major operating variables include type of feedstock, final temperature of pyrolysis, heating rate and particle size. The scale of this paper is to analyse the influence of operating parameters on production of pyrolysis bio-oil, char and gaseous products.

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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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Treatment of olive mill wastewater by supercritical water oxidation

Cited by 72 publications

References 22 publications

Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Supercritical Water Oxidation (SCWO) for Wastewater Treatment

A review on thermochemical treatment of biomass: Pyrolysis of olive mill wastes in comparison with other types of biomass

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

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