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Characteristics of Water Contaminants from Underground Coal Gasification (UCG) Process—Effect of Coal Properties and Gasification Pressure

Author

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  • Magdalena Pankiewicz-Sperka

    (Department of Energy Saving and Air Protection, Główny Instytut Górnictwa, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Krzysztof Kapusta

    (Department of Energy Saving and Air Protection, Główny Instytut Górnictwa, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Wioleta Basa

    (Department of Energy Saving and Air Protection, Główny Instytut Górnictwa, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Katarzyna Stolecka

    (Department of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland)

Abstract

One of the most important issues during UCG process is wastewater production and treatment. Condensed gasification wastewater is contaminated by many hazardous compounds. The composition of the generated UCG-derived wastewater may vary depending on the type of gasified coal and conditions of the gasification process. The main purpose of this study was a qualitative and quantitative characterization of the UCG wastewater produced during four different UCG experiments. Experiments were conducted using semi-anthracite and bituminous coal samples at two distinct pressures, i.e., 20 and 40 bar. The conducted studies revealed significant relationships between the physicochemical composition of the wastewater and the coal properties as well as the gasification pressure. The strongest impact is noticeable in the case of organic pollutants, especially phenols, BTEX and PAH’s. The most abundant group of pollutants were phenols. Conducted studies showed significantly higher concentration levels for bituminous coal: 29.25–49.5 mg/L whereas for semi-anthracite effluents these concentrations were in much lower range 2.1–29.7 mg/L. The opposite situation occurs for BTEX, higher concentrations were in wastewater from semi-anthracite gasification: 5483.1–1496.7 µg/L, while in samples from bituminous coal gasification average BTEX concentrations were: 2514.3–1354.4 µg/L. A similar relationship occurs for the PAH’s concentrations. The higher values were in case of wastewater from semi-anthracite coal experiments and were in range 362–1658 µg/L while from bituminous coal gasification PAH’s values are in lower ranges 407–1090 µg/L. The studies conducted have shown that concentrations of phenols, BTEX and PAH’s decrease with increasing pressure. Pearson’s correlation analysis was performed to enhance the interpretation of the obtained experimental data and showed a very strong relationship between three parameters: phenols, volatile phenols and COD cr .

Suggested Citation

  • Magdalena Pankiewicz-Sperka & Krzysztof Kapusta & Wioleta Basa & Katarzyna Stolecka, 2021. "Characteristics of Water Contaminants from Underground Coal Gasification (UCG) Process—Effect of Coal Properties and Gasification Pressure," Energies, MDPI, vol. 14(20), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6533-:d:654061
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    References listed on IDEAS

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    1. Khadse, Anil & Qayyumi, Mohammed & Mahajani, Sanjay & Aghalayam, Preeti, 2007. "Underground coal gasification: A new clean coal utilization technique for India," Energy, Elsevier, vol. 32(11), pages 2061-2071.
    2. Krzysztof Kapusta & Marian Wiatowski & Krzysztof Stańczyk & Renato Zagorščak & Hywel Rhys Thomas, 2020. "Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure," Energies, MDPI, vol. 13(6), pages 1-14, March.
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    1. Jacek Nowak & Magdalena Kokowska-Pawłowska & Joanna Komorek & Marian Wiatowski & Krzysztof Kapusta & Zdzisław Adamczyk, 2022. "Optical Properties of Coal after Ex-Situ Experimental Simulation of Underground Gasification at Pressures of 10 and 40 bar," Energies, MDPI, vol. 15(23), pages 1-19, November.
    2. Zhen Dong & Haiyang Yi & Yufeng Zhao & Xinggang Wang & Tingxiang Chu & Junjie Xue & Hanqi Wu & Shanshan Chen & Mengyuan Zhang & Hao Chen, 2022. "Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification," Energies, MDPI, vol. 15(19), pages 1-15, October.
    3. Marek Laciak & Ján Kačur & Milan Durdán, 2022. "Modeling and Control of Energy Conversion during Underground Coal Gasification Process," Energies, MDPI, vol. 15(7), pages 1-6, March.
    4. Yanpeng Chen & Tianduoyi Wang & Jinhua Zhang & Mengyuan Zhang & Junjie Xue & Juntai Shi & Yongshang Kang & Shengjie Li, 2022. "Simulation of Water Influx and Gasified Gas Transport during Underground Coal Gasification with Controlled Retracting Injection Point Technology," Energies, MDPI, vol. 15(11), pages 1-29, May.
    5. Jacek Borgulat & Katarzyna Ponikiewska & Łukasz Jałowiecki & Aleksandra Strugała-Wilczek & Grażyna Płaza, 2022. "Are Wetlands as an Integrated Bioremediation System Applicable for the Treatment of Wastewater from Underground Coal Gasification Processes?," Energies, MDPI, vol. 15(12), pages 1-19, June.

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