Supercritical Water Oxidation of Lurgi Coal Gasification Wastewater and Evaluation of the Combined Process with Gasification

Wang, Yu Zhen; Wang, Shu Zhong; Xu, Dong; Gong, Yan; Yu, Guang Xin; Yu, Hang

doi:10.4028/www.scientific.net/amr.610-613.2203

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Recently, the application of SCWO in coking wastewater has drawn considerable attention in China. Our studies show that for a wastewate with COD and NH 3 -N of 14900 and 7600 mg/L, respectively, the effluent quality after SCWO could satisfy the class-I criteria specified in the Integrated Wastewater Discharge Standard of China (GB 8978-1996) [1,2]. However, the corrosion of materials is one of the key limiting factors for the industrialization of SCWO process.…”

Section: Introductionmentioning

confidence: 83%

Corrosion Behavior of 316L Stainless Steel and Alloy 625 in Supercritical Water Oxidation for Coking Wastewater Treatment

Wang

et al. 2013

AMM

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The corrosion behavior of 316L stainless steel and alloy 625 were deteced in superciritical water oxidation (SCWO) process for coking wastewater treatment. The operation conditions were 500 °C, 25 MPa, oxygen ratio of 3.5 and the reaction time of 150 h. Surface morphologies of metal samples, oxide structure and compositions across the oxide thickness of the metal samples after SCWO were analyzed using SEM and ESD, and the corrosion rates for both samples were obtained. Pitting corrosion was found on the surface of 316L stainless steel with a corrosion rate of 0.334 mm/a. While no remarkable corrosion was found on the surface of alloy 625, and the corrosion rate is 0.052 mm/a.

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Section: Introductionmentioning

confidence: 83%

Corrosion Behavior of 316L Stainless Steel and Alloy 625 in Supercritical Water Oxidation for Coking Wastewater Treatment

Wang

et al. 2013

AMM

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“…It was often to increase reaction temperature, instead of increasing the amounts of oxygen to promote the pollutants decreasing. However, for the LCGW treatment, we have proposed a combination process between the SCWO and gasification processes . Here, the SCWO effluent is directly entered into the gasifier as gasification agents through which the excessive oxygen in SCWO process can be recovered completely, ultimately minimizing the cost limit of oxygen.…”

Section: Introductionmentioning

confidence: 99%

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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“…In their most recent study, Qian et al [16] presented an experimental and thermodynamic study for a combined process of SCWG and supercritical water partial oxidation (SCWPO) using liquid oxygen. Wang et al [17] studied a batch reactor that combined the degradation of Lurgi coal gasification wastewater (LCGW) with SCWO. Another work by Wang et al [18] proposed a combined process for cocking wastewater treatment with separated reactors for oxidation and gasification.…”

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confidence: 99%

Combined Gasification-Oxidation System for Waste Treatment with Supercritical Water: LCA and Performance Analysis

et al. 2020

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In this study the environmental performance of a first-of-its-kind integrated process based on supercritical water gasification and oxidation (SCW-GcO), was evaluated using life cycle assessment (LCA). The process was applied to the treatment of carbon black and used oil as model wastes. Mass and energy balances were performed using Aspen Plus, and the environmental assessment was carried out through SimaPro. A “from cradle to grave” approach was chosen for the analysis, considering impact categories such as climate change, ozone depletion, human toxicity, particulate matter, land use, resource depletion, and other relevant indicators. The environmental profile of the SCW-GcO process was compared to other technologies for the treatment of dangerous wastes, solvent mixtures, and exhaust mineral oils by using the Ecoinvent database. It is shown that SCW-GcO allows for reduced impacts in different categories and the obtention of a favorable positive life cycle energy balance, achieving good environmental performance.

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Supercritical Water Oxidation of Lurgi Coal Gasification Wastewater and Evaluation of the Combined Process with Gasification

Cited by 4 publications

References 9 publications

Corrosion Behavior of 316L Stainless Steel and Alloy 625 in Supercritical Water Oxidation for Coking Wastewater Treatment

Corrosion Behavior of 316L Stainless Steel and Alloy 625 in Supercritical Water Oxidation for Coking Wastewater Treatment

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

Combined Gasification-Oxidation System for Waste Treatment with Supercritical Water: LCA and Performance Analysis

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