Supercritical water oxidation of transformer oil contaminated with PCBs—A road to commercial plant from bench-scale facility

Kim, Kyeongsook; Kim, KwangSin; Son, Soon Hwan; Cho, Jungho; Kim, Yeong-Cheol

doi:10.1016/j.supflu.2011.04.021

Cited by 17 publications

(4 citation statements)

References 17 publications

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“…In this study 99.6% conversion of the total organic carbon (TOC) and reduction of the PCB level to below detection limit was achieved at 540 • C and 24 MPa with hydrogen peroxide as the oxidant. In the Korean study [98], oil samples were emulsified in water forming the feed for the supercritical water and oxygen-enriched air was used as the oxidant. The optimal temperature and pressure were 500 • C and 26.4 MPa, the destroying efficiency was >99.9% of the TOC and the measured dioxin in the environment of the plant was less than 15% of the Korean allowed limit.…”

Section: Removal Of Undesired Ingredients or Contaminantsmentioning

confidence: 99%

Some Advances in Supercritical Fluid Extraction for Fuels, Bio-Materials and Purification

Marcus

2019

Processes

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Supercritical fluids are used for the extraction of desired ingredients from natural materials, but also for the removal of undesired and harmful ingredients. In this paper, the pertinent physical and chemical properties of supercritical water, methanol, ethanol, carbon dioxide, and their mixtures are provided. The methodologies used with supercritical fluid extraction are briefly dealt with. Advances in the application of supercritical extraction to fuels, the gaining of antioxidants and other useful items from biomass, the removal of undesired ingredients or contaminants, and the preparation of nanosized particles of drugs are described.

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Section: Removal Of Undesired Ingredients or Contaminantsmentioning

confidence: 99%

Some Advances in Supercritical Fluid Extraction for Fuels, Bio-Materials and Purification

Marcus

2019

Processes

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“…25 Besides, the use of a multi-injection of cool water streams in different parts of the reactor is another way to control the excess of temperature along the reactor. Specifically, Kim et al 26 studied the SCWO of transformer oil contaminated with polychlorinated biphenyls (PCBs), and they simulated a SCWO reactor including cool water injection points to control the release of heat as a consequence of the high reaction heat of the oil maintaining that temperature between 500 and 600 °C. Besides, several authors have developed and studied new configurations of reactors to improve the thermal control of the process:…”

Section: Design Aspectsmentioning

confidence: 99%

Problems in Supercritical Water Oxidation Process and Proposed Solutions

Vadillo

Sánchez-Oneto

Portela

et al. 2013

Ind. Eng. Chem. Res.

135

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Supercritical water oxidation (SCWO) is a promising green technology to completely convert hazardous wastewaters to innocuous products, allowing energy recovery. This process has been extensively applied to many model compounds and real wastewaters at laboratory scale. However SCWO treatments at the pilot plant scale of real wastewaters are much less extensive in literature. Furthermore, the application of this technology to industrial wastewaters has the two main drawbacks of corrosion and salt deposition, and some other problems to be solved related to management of biphasic wastes, presence of suspended solids, high costs, etc., so currently the industrial scale-up and commercialization of the process is still subject to difficulties. This work reviews the main technical solutions studied by numerous authors to avoid the drawbacks mentioned. Besides, since the economic feasibility of the process will depend on the energy recovery of the reactor effluent, this aspect is also presented in this review.

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“…There are many studies and reviews involving SCWO available . Commercial SCWO plants have also been reported to be operated successfully in several areas . However, there have been no reports of SCWO being used to treat rosin wastewater up to date.…”

Section: Introductionmentioning

confidence: 99%

Sub/supercritical water oxidation of high concentration wastewater from tall oil rosin production base

Miao

Wang

Shen

et al. 2016

Env Prog and Sustain Energy

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The sub/supercritical water oxidation (SCWO) of wastewater with high concentrations of pollutants from tall oil rosin production base was studied under the temperature range of 3208C-4208C and the pressure range of 11-25 MPa. The results showed that after pretreatment with Ca(OH) 2 for SO remained which inhibited the oxidation activity by reducing the concentration of hydroxyl radicals (•OH). Since the wastewater compounds were mainly cyclic organic materials, higher O 2 contents (stoichiometric ratio over 2.5) and temperatures (over 3808C) are favorable for TOC removal. With O 2 SR 5 2.5 and T 5 4208C, the TOC removal reached almost 100% (99.89%) in 30 min. A global kinetic model for TOC removal during SCWO treatment was built during the research. The kinetic data acquired through the model were fitted to a power-law function, and the data correlated well with the experimental data.

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Supercritical water oxidation of transformer oil contaminated with PCBs—A road to commercial plant from bench-scale facility

Cited by 17 publications

References 17 publications

Some Advances in Supercritical Fluid Extraction for Fuels, Bio-Materials and Purification

Some Advances in Supercritical Fluid Extraction for Fuels, Bio-Materials and Purification

Problems in Supercritical Water Oxidation Process and Proposed Solutions

Sub/supercritical water oxidation of high concentration wastewater from tall oil rosin production base

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