Environmental effects of supercritical water oxidation (SCWO) process for treating transformer oil contaminated with polychlorinated biphenyls (PCBs)

Kim, Kyeongsook; Son, Soon Hwan; Kim, KwangSin; Kim, Kyungbok; Kim, Yeong-Cheol

doi:10.1016/j.cej.2010.09.012

Cited by 34 publications

(11 citation statements)

References 7 publications

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“…Of particular interest is the effluent vapor, which consists of CO 2 , N 2 and excess O 2 , with the NO x and SO x going directly to the liquid effluent (Pirkanniemi and Sillanpaa, 2002). Therefore the vapor stream is compliant with most conventional environmental regulations (Kim et al, 2010). SCWO effectively provides a fast, single step conversion process with fast reaction rates.…”

Section: Introductionmentioning

confidence: 98%

Supercritical water oxidation of a model fecal sludge without the use of a co-fuel

et al. 2015

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A continuous supercritical water oxidation reactor was designed and constructed to investigate the conversion of a feces simulant without the use of a co-fuel. The maximum reactor temperature and waste conversion was determined as a function of stoichiometric excess of oxygen in order to determine factor levels for subsequent investigation. 48% oxygen excess showed the highest temperature with full conversion. Factorial analysis was then used to determine the effects of feed concentration, oxygen excess, inlet temperature, and operating pressure on the increase in the temperature of the reacting fluid as well as a newly defined non-dimensional number, NJa representing heat transfer efficiency. Operating pressure and stoichiometric excess oxygen were found to have the most significant impacts on NJa. Feed concentration had a significant impact on fluid temperature increase showing an average difference of 46.4°C between the factorial levels.

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Section: Introductionmentioning

confidence: 98%

Supercritical water oxidation of a model fecal sludge without the use of a co-fuel

et al. 2015

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“…SCWO has been developed to treat various wastes, such as PCB-contaminated mineral transformer oil, wastewater, sludge, and dioxin-contained fly ash (Table 7) [45,74,108,109]. This technique is an effective, harmless, fast, and violent detoxification method [108,110,111]. Under the condition of water supercritical point (22.1 MPa and 374 • C), supercritical water exhibits a perfect miscibility with organic contaminants such as dioxins.…”

Section: Supercritical Water Oxidation (Scwo)mentioning

confidence: 99%

Characteristics and Treatment Methods of Medical Waste Incinerator Fly Ash: A Review

et al. 2018

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Medical waste incinerator fly ash (MWIFA) is quite different from municipal solid waste incinerator fly ash (MSWIFA) due to its special characteristics of high levels of chlorines, dioxins, carbon constituents, and heavy metals, which may cause irreversible harm to environment and human beings if managed improperly. However, treatment of MWIFA has rarely been specifically mentioned. In this review, various treatment techniques for MSWIFA, and their merits, demerits, applicability, and limitations for MWIFA are reviewed. Natural properties of MWIFA including the high contents of chlorine and carbonaceous matter that might affect the treatment effects of MWIFA are also depicted. Finally, several commendatory and feasible technologies such as roasting, residual carbon melting, the mechanochemical technique, flotation, and microwave treatment are recommended after an overall consideration of the special characteristics of MWIFA, balancing environmental, technological, economical information.

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“…A four factor-five coded level ( Table 2) CCD was carried out to fit the variables to the general model of Eq. (5).…”

Section: Experimental Design and Model Developmentmentioning

confidence: 99%

“…The necessary reaction temperature for the complete removal of ammonianitrogen (NH 3 AN) would be higher than 600 C when operated at oxygen ratio (OR) <1. 5. Such a high temperature aggravates the energy consumption and places great corrosion resistance stress on the reactor materials.…”

Section: Introductionmentioning

confidence: 99%

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Oxidative degradation of lurgi coal gasification wastewater: Optimization using response surface methodology

Wang

et al. 2014

Env Prog and Sustain Energy

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Lurgi coal‐gasification wastewater with an initial total organic carbon (TOC) of 5000 mg/L and ammonia nitrogen (NH3N) of 1500 mg/L was treated by supercritical water oxidation technology to make the effluent reach the national wastewater discharge standard I in China (TOC < 20 mg/L, NH3N < 15 mg/L). Response surface methodology method combined with central composite design and regression analysis were used to statistically analyze and optimize the operating parameters. The effect degree of the parameters on TOC and NH3N decreasing were in the following order: temperature (440–600°C) > oxygen ratio (OR) (1–5) > reaction time (20–300 s) > pressure (22.2–30.2 MPa). The interactive effects of temperature and OR were significant on both COD and NH3N decreasing. The optimum conditions within experimental ranges were: 540°C, 27 MPa, OR of 3, and reaction time of 219 s. Under these conditions, the experimental TOC and NH3N decreasing efficiencies were 99.69 and 99.07%, respectively. The effluent can reach the wastewater discharge standard I. The main intermediate products of the pollutants during the oxidation process were detected and possible degradation pathways were also proposed. © 2014 American Institute of Chemical Engineers Environ Prog, 33: 1258–1265, 2014

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Environmental effects of supercritical water oxidation (SCWO) process for treating transformer oil contaminated with polychlorinated biphenyls (PCBs)

Cited by 34 publications

References 7 publications

Supercritical water oxidation of a model fecal sludge without the use of a co-fuel

Supercritical water oxidation of a model fecal sludge without the use of a co-fuel

Characteristics and Treatment Methods of Medical Waste Incinerator Fly Ash: A Review

Oxidative degradation of lurgi coal gasification wastewater: Optimization using response surface methodology

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