Environmental impact of the oil shale industry

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Kivioli Oil Shale Processing & Chemicals Plant in Ida-Virumaa, Estonia Kivioli chemical plant.JPG
Kiviõli Oil Shale Processing & Chemicals Plant in Ida-Virumaa, Estonia

Environmental impact of the oil shale industry includes the consideration of issues such as land use, waste management, and water and air pollution caused by the extraction and processing of oil shale. Surface mining of oil shale deposits causes the usual environmental impacts of open-pit mining. In addition, the combustion and thermal processing generate waste material, which must be disposed of, and harmful atmospheric emissions, including carbon dioxide, a major greenhouse gas. Experimental in-situ conversion processes and carbon capture and storage technologies may reduce some of these concerns in future, but may raise others, such as the pollution of groundwater. [1] [2]

Contents

Surface mining and retorting

Land use and waste management

Surface mining and in-situ processing requires extensive land use. Mining, processing, and waste disposal require land to be withdrawn from traditional uses, and therefore should avoid high density population areas. [3] Oil shale mining reduces the original ecosystem diversity with habitats supporting a variety of plants and animals. After mining the land has to be reclaimed, process takes time and cannot necessarily re-establish the original biodiversity. [3] [4] The impact of sub-surface mining on the surroundings will be less than for open pit mines. However, sub-surface mining may also cause subsidence of the surface due to the collapse of mined-out area and abandoned stone drifts. [3]

Disposal of mining wastes, spent oil shale (including semi-coke) and combustion ashes needs additional land use. According to the study of the European Academies Science Advisory Council, after processing, the waste material occupies a greater volume than the material extracted, and therefore cannot be wholly disposed underground. According to this, production of a barrel of shale oil can generate up to 1.5 tonnes of semi-coke, which may occupy up to 25% greater volume than the original shale. [3] This is not confirmed by the results of Estonia's oil shale industry. The mining and processing of about one billion tonnes of oil shale in Estonia has created about 360-370 million tonnes of solid waste, of which 90 million tonnes is a mining waste, 70–80 million tonnes is a semi-coke, and 200 million tonnes are combustion ashes. [5]

The waste material may consist of several pollutants including sulfates, heavy metals, and polycylic aromatic hydrocarbons (PAHs), some of which are toxic and carcinogenic. [6] [7] To avoid contamination of the groundwater, the solid waste from the thermal treatment process is disposed in an open dump (landfill or "heaps"), not underground where it could potentially reach clean ground water. As semi-coke consists of, in addition to minerals, up to 10% organics that may pose hazard to the environment owing to leaching of toxic compounds as well as to the possibility of self-ignition. [5]

Water management

Mining influences the water runoff pattern of the area affected. In some cases it requires the lowering of groundwater levels below the level of the oil shale strata, which may have harmful effects on the surrounding arable land and forest. [3] In Estonia, for each cubic meter of oil shale mined, 25 cubic meters of water must be pumped from the mine area. [8] At the same time, the thermal processing of oil shale needs water for quenching hot products and the control of dust. Water concerns are a particularly sensitive issue in arid regions, such as the western part of the United States and Israel's Negev Desert, where there are plans to expand the oil shale industry. [9] Depending on technology, above-ground retorting uses between one and five barrels of water per barrel of produced shale oil. [1] [10] [11] [12] [13] [14] In situ processing, according to one estimate, uses about one-tenth as much water. [15]

Water is the main transmitter of oil shale industry pollutants. One environmental issue is to prevent noxious materials leaching from spent shale into the water supply. [3] The oil shale processing is accompanied by the formation of process waters and waste waters containing phenols, tar and several other products, heavily separable and toxic to the environment. [5] A 2008 programmatic environmental impact statement issued by the United States Bureau of Land Management stated that surface mining and retort operations produce 2 to 10 U.S. gallons (7.6 to 37.9 L; 1.7 to 8.3 imp gal) of waste water per 1 short ton (0.91 t) of processed oil shale. [13]

Air pollution management

Main air pollution is caused by the oil shale-fired power plants. These factory plants provide the atmospheric emissions of gaseous products like nitrogen oxides, sulfur dioxide and hydrogen chloride, and the airborne particulate matter (fly ash). It includes particles of different types (carbonaceous, inorganic ones) and different sizes. [16] [17] The concentration of air pollutants in flue gas depends primarily on the combustion technology and burning regime, while the emissions of solid particles are determined by the efficiency of fly ash-capturing devices. [16]

Open deposition of semi-coke causes distribution of pollutants in addition to aqueous vectors also via air (dust). [5]

There are possible links from being in an oil shale area to a higher risk of asthma and lung cancer than other areas. [18]

Greenhouse gas emissions

Carbon dioxide emissions from the production of shale oil and shale gas are higher than conventional oil production and a report for the European Union warns that increasing public concern about the adverse consequences of global warming may lead to opposition to oil shale development. [1] [3]

Emissions arise from several sources. These include CO2 released by the decomposition of the kerogen and carbonate minerals in the extraction process, the generation of the energy needed to heat the shale and in the other oil and gas processing operations, and fuel used in the mining of the rock and the disposal of waste. [3] [16] [19] As the varying mineral composition and calorific value of oil shale deposits varies widely, the actual values vary considerably. [3] At best, the direct combustion of oil shales produces carbon emissions similar to those from the lowest form of coal, lignite, at 2.15  moles CO2/MJ, [3] an energy source which is also politically contentious due to its high emission levels. [20] [21] For both power generation and oil extraction, the CO2 emissions can be reduced by better utilization of waste heat from the product streams.

In-situ processing

Currently, the in-situ process is the most attractive proposition due to the reduction in standard surface environmental problems. However, in-situ processes do involve possible significant environmental costs to aquifers, especially since in-situ methods may require ice-capping or some other form of barrier to restrict the flow of the newly gained oil into the groundwater aquifers. However, after the removal of the freeze wall these methods can still cause groundwater contamination as the hydraulic conductivity of the remaining shale increases allowing groundwater to flow through and leach salts from the newly toxic aquifer. [12] [22]

See also

Related Research Articles

<span class="mw-page-title-main">Oil shale</span> Organic-rich fine-grained sedimentary rock containing kerogen

Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen from which liquid hydrocarbons can be produced. In addition to kerogen, general composition of oil shales constitutes inorganic substance and bitumens. Based on their deposition environment, oil shales are classified as marine, lacustrine and terrestrial oil shales. Oil shales differ from oil-bearing shales, shale deposits that contain petroleum that is sometimes produced from drilled wells. Examples of oil-bearing shales are the Bakken Formation, Pierre Shale, Niobrara Formation, and Eagle Ford Formation. Accordingly, shale oil produced from oil shale should not be confused with tight oil, which is also frequently called shale oil.

Shale oil is an unconventional oil produced from oil shale rock fragments by pyrolysis, hydrogenation, or thermal dissolution. These processes convert the organic matter within the rock (kerogen) into synthetic oil and gas. The resulting oil can be used immediately as a fuel or upgraded to meet refinery feedstock specifications by adding hydrogen and removing impurities such as sulfur and nitrogen. The refined products can be used for the same purposes as those derived from crude oil.

Fushun Mining Group is a large state-owned coal and oil shale company located in Fushun, Liaoning Province, China. The corporation consists of about 30 companies with about 28,000 employees. The main business includes coal mining and oil shale processing. According to figures released by FMG, this company is one of the world's largest shale oil producers.

Viru Keemia Grupp is a private Estonian large-scale industrial enterprise. It focuses on oil shale mining, shale oil, combined heat and power production and production and marketing of fine chemical products.

<span class="mw-page-title-main">Oil shale industry</span> Resource extraction industry

The oil shale industry is an industry of mining and processing of oil shale—a fine-grained sedimentary rock, containing significant amounts of kerogen, from which liquid hydrocarbons can be manufactured. The industry has developed in Brazil, China, Estonia and to some extent in Germany and Russia. Several other countries are currently conducting research on their oil shale reserves and production methods to improve efficiency and recovery. Estonia accounted for about 70% of the world's oil shale production in a study published in 2005.

<span class="mw-page-title-main">Shale oil extraction</span> Process for extracting oil from oil shale

Shale oil extraction is an industrial process for unconventional oil production. This process converts kerogen in oil shale into shale oil by pyrolysis, hydrogenation, or thermal dissolution. The resultant shale oil is used as fuel oil or upgraded to meet refinery feedstock specifications by adding hydrogen and removing sulfur and nitrogen impurities.

Oil shale economics deals with the economic feasibility of oil shale extraction and processing. Although usually oil shale economics is understood as shale oil extraction economics, the wider approach evaluates usage of oil shale as a whole, including for the oil-shale-fired power generation and production of by-products during retorting or shale oil upgrading processes.

<span class="mw-page-title-main">History of the oil shale industry</span>

The history of the oil shale industry started in ancient times. The modern industrial use of oil shale for oil extraction dates to the mid-19th century and started growing just before World War I because of the mass production of automobiles and trucks and the supposed shortage of gasoline for transportation needs. Between the World Wars oil shale projects were begun in several countries.

<span class="mw-page-title-main">Kukersite</span> Light-brown marine type oil shale of Ordovician age

Kukersite is a light-brown marine type oil shale of Ordovician age. It is found in the Baltic Oil Shale Basin in Estonia and North-West Russia. It is of the lowest Upper Ordovician formation, formed some 460 million years ago. It was named after the German name of the Kukruse Manor in the north-east of Estonia by the Russian paleobotanist Mikhail Zalessky in 1917. Some minor kukersite resources occur in sedimentary basins of Michigan, Illinois, Wisconsin, North Dakota, and Oklahoma in North America and in the Amadeus and Canning basins of Australia.

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The Kiviter process is an above ground retorting technology for shale oil extraction.

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The Alberta Taciuk process is an above-ground dry thermal retorting technology for extracting oil from oil sands, oil shale and other organics-bearing materials, including oil contaminated soils, sludges and wastes. The technology is named after its inventor William Taciuk and the Alberta Oil Sands Technology and Research Authority.

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<span class="mw-page-title-main">Spent shale</span> Solid residue from the shale oil extraction process

Spent shale or spent oil shale is a solid residue from the shale oil extraction process of producing synthetic shale oil from oil shale. It consists of inorganic compounds (minerals) and remaining organic matter known as char—a carbonaceous residue formed from kerogen. Depending on the extraction process and the amount of remaining organic matter, spent shale may be classified as oil shale coke, semi-coke or coke-ash residue, known also as oil shale ash. According to the European Union waste list all these types of spent shale are classified as hazardous waste.

References

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  3. 1 2 3 4 5 6 7 8 9 10 Francu, Juraj; Harvie, Barbra; Laenen, Ben; Siirde, Andres; Veiderma, Mihkel (May 2007). "A study on the EU oil shale industry viewed in the light of the Estonian experience. A report by EASAC to the Committee on Industry, Research and Energy of the European Parliament" (PDF). European Academies Science Advisory Council: 23–30. Retrieved 6 May 2011.{{cite journal}}: Cite journal requires |journal= (help)
  4. ↑ Kattel, T. (2003). "Design of a new oil shale surface mine" (PDF). Oil Shale. A Scientific-Technical Journal . 20 (4). Estonian Academy Publishers: 511–514. ISSN   0208-189X . Retrieved 23 June 2007.
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  6. ↑ Mölder, Leevi (2004). "Estonian Oil Shale Retorting Industry at a Crossroads" (PDF). Oil Shale. A Scientific-Technical Journal . 21 (2). Estonian Academy Publishers: 97–98. ISSN   0208-189X . Retrieved 23 June 2007.
  7. ↑ Tuvikene, Arvo; Sirpa Huuskonen; Kari Koponen; Ossi Ritola; Ülle Mauer; Pirjo Lindström-Seppä (1999). "Oil Shale Processing as a Source of Aquatic Pollution: Monitoring of the Biologic Effects in Caged and Feral Freshwater Fish". Environmental Health Perspectives . 107 (9). National Institute of Environmental Health Sciences: 745–752. doi:10.2307/3434660. JSTOR   3434660. PMC   1566439 . PMID   10464075.
  8. ↑ Brendow, K. (2003). "Global oil shale issues and perspectives. Synthesis of the Symposium on Oil Shale. 18–19 November, Tallinn" (PDF). Oil Shale. A Scientific-Technical Journal . 20 (1). Estonian Academy Publishers: 81–92. ISSN   0208-189X . Retrieved 21 July 2007.
  9. ↑ Speckman, Stephen (22 March 2008). "Oil-shale 'rush' is sparking concern". Deseret News . Archived from the original on 24 March 2008. Retrieved 24 August 2008.
  10. ↑ "Fact Sheet:Oil Shale Water Resources" (PDF). United States Department of Energy. Retrieved 15 September 2007.{{cite journal}}: Cite journal requires |journal= (help)
  11. ↑ "Critics charge energy, water needs of oil shale could harm environment". U.S. Water News Online. July 2007. Archived from the original on 18 June 2008. Retrieved 1 April 2008.
  12. 1 2 Bartis, James T.; LaTourrette, Tom; Dixon, Lloyd; Peterson, D.J.; Cecchine, Gary (2005). Oil Shale Development in the United States. Prospects and Policy Issues. Prepared for the National Energy Technology Laboratory of the United States Department of Energy (PDF). The RAND Corporation. ISBN   978-0-8330-3848-7 . Retrieved 29 June 2007.
  13. 1 2 "Chapter 4. Effects of Oil Shale Technologies". Proposed Oil Shale and Tar Sands Resource Management Plan Amendments to Address Land Use Allocations in Colorado, Utah, and Wyoming and Final Programmatic Environmental Impact Statement (PDF). Bureau of Land Management. September 2008. pp. 4–3. FES 08-32. Archived from the original (PDF) on 27 May 2010. Retrieved 7 August 2010.
  14. ↑ Luken, Larry (9 July 2005). "Oil Shale Myths". Shale Oil Information Center. Archived from the original on 28 October 2008. Retrieved 1 April 2008.
  15. ↑ Fischer, Perry A. (August 2005). "Hopes for shale oil are revived". World Oil Magazine. Gulf Publishing Company. Archived from the original on 9 November 2006. Retrieved 1 April 2008.
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  17. ↑ Teinemaa, E.; Kirso, U.; Strommen, M.R.; Kamens, R.M. (2003). "Deposition flux and atmospheric behavior of oil shale combustion aerosols" (PDF). Oil Shale. A Scientific-Technical Journal . 20 (3 Special). Estonian Academy Publishers: 429–440. ISSN   0208-189X . Retrieved 2 September 2007.
  18. ↑ Lotman, Silvia. "Op-ed: Don't let Estonian shale firm do to Utah what it has done to Estonia". The Salt Lake Tribune. Retrieved 14 June 2016.
  19. ↑ Koel, Mihkel (1999). "Estonian oil shale". Oil Shale. A Scientific-Technical Journal (Extra). Estonian Academy Publishers. ISSN   0208-189X . Retrieved 21 July 2007.
  20. ↑ "The Greens Won't Line Up For Dirty Brown Coal in the Valley". Australian Greens Victoria. 18 August 2006. Archived from the original on 24 June 2007. Retrieved 28 June 2007.
  21. ↑ "Greenpeace Germany Protests Brown Coal Power Stations". Environment News Service. 28 May 2004. Archived from the original on 30 September 2007. Retrieved 28 June 2007.
  22. ↑ Grunewald, Elliot (6 June 2006). "Oil Shale and the Environmental Cost of Production" (PDF). Stanford University. Archived from the original (PDF) on 13 June 2007. Retrieved 2 June 2007.{{cite journal}}: Cite journal requires |journal= (help)
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