An anti-corrosive reactor for the decomposition of halogenated hydrocarbons with supercritical water oxidation

Lee, Hyeon-Cheol; In, Jung Hyun; Lee, Sang Young; Kim, Jong Hwa; Lee, Chang Ha

doi:10.1016/j.supflu.2005.04.001

Cited by 44 publications

(24 citation statements)

References 19 publications

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“…This element can be made of a sintered metal (stainless steel 136 or Ni-alloy 132,137 ) or a ceramic element, such as porous alumina. 138,139 The main characteristics of these reactors are summarized in Table 3.…”

Section: Types Of Reactors For the Scwo Processmentioning

confidence: 99%

Supercritical water oxidation: A technical review

2006

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Supercritical water oxidation (SCWO) technology presents important environmental advantages for the treatment of industrial wastes and sludges. The homogeneous reaction that takes place between the oxidizable materials and oxygen, at temperatures and pressures above the critical point of the water (647.3 K and 22.12 MPa), is well known. Specific equations of state for water and aqueous mixtures, gases, and organics have been developed. The process is not having the expected industrial development. Some new plants have been closed by corrosion and operational problems related with high temperature, high pressure, and oxidative atmosphere inside of the equipments. To overcome these technical difficulties more research focused on solving operational problems is necessary. This article presents an overview of the technical aspects of the supercritical water oxidation process. Reactors design, construction materials, corrosion, salts precipitation problems, and industrial applications are discussed. © 2006 American Institute of Chemical Engineers AIChE J, 2006

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Section: Types Of Reactors For the Scwo Processmentioning

confidence: 99%

Supercritical water oxidation: A technical review

2006

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“…The TWR system used in this work has been presented in a previous study ( Lee et al, 2005 ). However, the main difference from that paper is that a cooling chamber was designed.…”

Section: Methodsmentioning

confidence: 99%

“…This cold water creates a thin layer that protects the wall against corrosion and salt deposition. A number of reports ( Bermejo and Cocero, 2006 ; Lee et al, 2005 ; Príkopský et al, 2006 ) stated that TWR reactors show high decomposition efficiency of reactant and great performance against corrosion in treating artificial or industrial wastewater.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Industrial Dyeing Wastewater by Supercritical Water Oxidation in Transpiring‐Wall Reactor

Gong

Li²,

Xi³

2008

Water Environment Research

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Industrial dyeing wastewater was oxidized in supercritical water in a transpiring-wall reactor, using hydrogen peroxide as an oxidant. Experiments were performed at 595 to 704 K and 18 to 30 MPa, with an oxidant dosage ratio ranging from 0.6 to 2.0. A chemical oxygen demand (COD) removal of more than 98.4% was achieved at 704 K and 28 MPa, with a retention time less than 35 seconds, which increased with the temperature, pressure, and oxidant. A modified first-order rate expression was regressed from experimental data, taking into account the influence of induction time. The resulting pre-exponential factor, A, and activation energy, Ea, were 1.07 seconds 21 and 12.12 kJ Á mol 21 , respectively, while the reaction order for feed wastewater (based on COD) and oxidant were assumed to be 1 and 0, respectively. Gas chromatography/mass spectrometry analysis for effluents indicated that carbon dioxide, carbon monoxide, and nitrogen were the main reaction products, and phenol; benzenecarboxylic acid; 1, 2-benzenedicarboxylic acid; and isoquinoline were detected as intermediates. Water Environ. Res., 80, 186 (2008).

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“…One of the well-known catalysts for chloroform removal is Pt/Pd NPs., which are not cost-effective for commercial applications (8). Hydro-dechlorination is another approach to degrade chloroform; however, this method requires a high-temperature treatment (9)(10)(11)(12)(13)(14)(15)(16), indicating that this method is not a cost-effective alternative. Moreover, this method has the drawback of producing toxic byproducts such as phosgene and furan (17,18).…”

Section: Introductionmentioning

confidence: 99%

Cheap Nano-Adsorbents Based on Zno/Mineral Nanocomposites for Removal of Chloroform from Water Solution

Salehi-Babarsad

Derikvand

Razaz

et al. 2020

Jundishapur J Health Sci

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Background: Chloroform, as a hazardous chemical, can contaminate water resources via the reaction of chlorine as an antiseptic chemical with humic acids resulted from agricultural activities. In humans, chloroform may cause dizziness, heart disorders, and disorders of the nervous system. Hence, its removal is of crucial importance. Objectives: The current study aimed to propose cheap and efficient adsorbents to remove chloroform from water. Methods: Four different nanomaterials (ZnO, ZnO/graphene oxide (ZnO/GO), ZnO/GO/Zeolite, and GO/Zeolite nanocomposites) were prepared and characterized with X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) images. Textural properties of the nano- adsorbents were evaluated using Brunauer Emmet Teller (BET) and Barrett-Joyner-Halenda (BJH) techniques. Different isotherms and kinetic models were studied. The effect of pH on the removal efficiency of the nano-adsorbents was tested. Regenerability of the nano-adsorbents towards the removal of the chloroform was also evaluated. Results: XRD patterns and FESEM images of the nanocomposites confirmed lattice structures and nanoscale particle size of the prepared nanocomposites. According to the BET and BJH models, all samples had mesoporous structures. The BJH cumulative surface area of pores of ZnO, ZnO/GO, ZnO/GO/Zeolite, and GO/Zeolite nanocomposites were 8.5, 26.4, 17.2, and 20.8 m2/g, respectively. The best removal speed and efficiency were obtained according to the different isotherm and kinetic models for the removal of chloroform ZnO/GO nanocomposites. All adsorbents revealed characteristic adsorption in the pH range of 7 to 8. Conclusion: The ZnO/GO, a cheap and efficient nanocomposite, showed the best performance to remove chloroform from water samples due to its superior textural property. Hence, it can be used to remove chloroform from water for up to 5 cycles.

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An anti-corrosive reactor for the decomposition of halogenated hydrocarbons with supercritical water oxidation

Cited by 44 publications

References 19 publications

Supercritical water oxidation: A technical review

Supercritical water oxidation: A technical review

Oxidation of Industrial Dyeing Wastewater by Supercritical Water Oxidation in Transpiring‐Wall Reactor

Cheap Nano-Adsorbents Based on Zno/Mineral Nanocomposites for Removal of Chloroform from Water Solution

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