Treatment of textile wastewater by SCWO in a tube reactor

Söğüt, Onur Ö.; Akgün, Mesut

doi:10.1016/j.supflu.2007.04.007

Cited by 58 publications

(17 citation statements)

References 25 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: 76%

“…In which cases, considerable fractions of organic pollutants break down into smaller molecules without being completely oxidized, and leave the reactor system in gas phase instead of remaining in the liquid effluent. 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.…”

Section: Temperaturementioning

confidence: 96%

“…The residence time at continuous reactor systems is set by deciding the reactor volume and arranging the fluid flow rates. Total pollutant conversion (x D 1) is achievable at SCWO reactors with short residence times changing from several seconds to minutes [7,31,[42][43][44][45]. An example is shown in Fig.…”

Section: Residence Timementioning

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: 76%

Section: Temperaturementioning

confidence: 96%

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Supercritical Water Oxidation (SCWO) for Wastewater Treatment

Akgün

Söğüt

2014

Biofuels and Biorefineries

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“…2 shows the effect of the O 2 stoichiometric ratio on TOC conversion at a fixed reaction pressure (25 MPa) and TOC concentration of the wastewater storage tank (0.57 mol L −1 ). The initial TOC and O 2 concentrations at the reactor inlet were varied by changing the flow rates of wastewater and H 2 O 2 solution to keep the residence time at a constant value of 15 s. It was found that TOC conversion increased significantly with increasing in reaction temperature [13][14][15][16]. However, as can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Supercritical water oxidation of wastewater from acrylonitrile manufacturing plant

Shin

Veriansyah

et al. 2009

Journal of Hazardous Materials

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“…Conventional dye wastewater treatment methods are gradually becoming inadequate to meet the requirements of a higher environmental quality. In recent years, various advanced oxidation processes such as ozonation [2], wet air oxidation [3,4], supercritical water oxidation [5], photocatalytic oxidation [6,7], electrochemical oxidation [8][9][10][11] and other integrated techniques [12][13][14] have been proposed as substitutes for the conventional treatment techniques. Among these advanced oxidation processes, electrochemical oxidation method which uses electrons as the main reagent, only requiring a little or even no chemical reagent, is a clean and effective wastewater treatment method.…”

Section: Introductionmentioning

confidence: 99%