Heat recovery potential of mine water treatment systems in Great Britain

Bailey, Matthew T.; Gandy, Catherine J.; Watson, Ian; Wyatt, Lee; Jarvis, Adam P.

doi:10.1016/j.coal.2016.03.007

Cited by 48 publications

(50 citation statements)

References 22 publications

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“…There is a long list of environmental hazards associated with coal mining: visual impacts on the landscape, air, and even noise pollution, soil erosion, soil and sediment contamination, slag heaps and slag-heap fires, subsidence, surface and groundwater pollution, and a general degradation of local biodiversity [19][20][21]. Extraction and dumping of voluminous amounts of discarded mine tailings provoke additional environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Coal-Mining Tailings as a Pozzolanic Material in Cements Industry

et al. 2018

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Abstract:The generation of enormous volumes of mine-tailing waste is standard practice in the mining industry. Large quantities of these tailings are also sources of kaolinite-rich materials that accumulate in slag heaps, causing significant environmental degradation and visual impacts on the landscape. The consequences of coal refuse dumped in slagheaps calls for the study of eco-innovative solutions and the assessment of waste types. Moreover, the environmental benefits of reusing large amounts of contaminated waste are also evident. Hence, the objective of this investigation is to expand current knowledge of new siliceous-aluminium minerals and their pozzolanic activity. Four raw tailing samples are characterized to determine their chemical (by ICP/MS analysis), morphological (by SEM/EDX analysis), and mineralogical (by XRD analysis) compositions prior to their thermal activation that transforms the inert wastes at various temperatures into materials with cementitious properties. The results of XRD analysis following activation confirmed that the kaolinite content is fully transformed into metakaolinite. The coal refuse samples presented sufficiently reliable levels of pozzolanic activity for use as additives in industrial cements.

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Section: Introductionmentioning

confidence: 99%

Coal-Mining Tailings as a Pozzolanic Material in Cements Industry

et al. 2018

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“…Equipment was calibrated before each day's fieldwork and all water samples were refrigerated as soon as possible after collection. Mine waters from greater depth tend to have higher conductivities due to longer rock-water interaction, greater potential influence of saline waters, and inflows of strata water with higher conductivity [13]. All the waters evaluated can be classified as very hard according with their hardness (400-1000 µS/cm).…”

Section: Methodsmentioning

confidence: 99%

Characterization of Laciana Valley District mine water as geothermal resource

Matas

García-Carro²,

Loredo

2018

E3S Web Conf.

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Abstract. Laciana Valley District is a coal mining region located in northern Spain. This region counts with several mining facilities, among them: eight underground mines (six mountain mines and two mine shafts) and three open pit mines. Nowadays, all the mining facilities have been closed down and are flooded. The water found inside them could be used as a geothermal resource due to its thermal properties and the proximity to population. The aim of the study is to analyze the water of the facilities located in Laciana Valley and determine its potential to be used as a geothermal resource for a district heating system. In order to achieve this goal an extensive field work has been performed, nine different mine water discharges have been chosen and several water characteristics have been selected for analysis. The parameters measured have been pH, conductivity, hardness, temperature, turbidity and alkalinity. The results have been evaluated in order to determine the fluctuations of the physico-chemical parameters throughout a hydrological year and the mining facilities have been compared between each other regarding their mine water quality. The analysis of all the information gathered in the study shows a noteworthy thermal potential in the water of the abandoned mines of the region.

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“…Any more heat removal will inevitably lead to non-sustainable heat mining unless heat storage options are also considered. The potential for mine source heat energy globally is significant, with 3000 MW potentially available from flooded mines throughout Europe (Bailey et al 2016) and it is thought that there are more than 1 million abandoned mines throughout the world (Hall et al 2011).…”

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confidence: 99%

“…Interest in the renewable heat energy potential of UK mine workings has seen a recent resurgence (e.g. Bailey et al 2016;Farr et al 2016). Feasibility studies of the potential of abandoned coal mine workings have been funded in Scotland (Harnmeijer et al 2012) and Wales (Department for Business Energy & Industrial Strategy 2018) and pilot schemes have been installed at two former collieries in England (Banks et al 2019).…”

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confidence: 99%

Coupled hydraulic and mechanical model of surface uplift due to mine water rebound: implications for mine water heating and cooling schemes

Todd

McDermott

Harris

et al. 2019

SJG

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In order to establish sustainable heat loading (heat removal and storage) in abandoned flooded mine workings it is important to understand the geomechanical impact of the cyclical heat loading caused by fluid injection and extraction. This is particularly important where significantly more thermal loading is planned than naturally occurs. A simple calculation shows that the sustainable geothermal heat flux from abandoned coal mines can provide less than a tenth of Scotland's annual domestic heating demand. Any heat removal greater than the natural heat flux will lead to heat mining unless heat storage options are also considered.As a first step, a steady-state, fully saturated, 2D coupled hydromechanical model of a generalized section of pillar-and-stall workings has been created. Mine water rebound was modelled by increasing the hydrostatic pressure sequentially, in line with monitored mine water-level data from Midlothian, Scotland. The modelled uplift to water-level rise ratio of 1.4 mm m −1 is of the same order of magnitude (1 mm m −1 ) as that observed through interferometric synthetic aperture radar (InSAR) data in the coalfield due to mine water rebound. The modelled magnitude of shear stress at the pillar corners, as a result of horizontal and vertical displacement, is shown to increase linearly with water level. Mine heat systems are expected to cause smaller changes in pressure than those modelled but the results provide initial implications on the potential geomechanical impacts of mine water heat schemes which abstract or inject water and heat into pillar-and-stall coal mine workings.

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Heat recovery potential of mine water treatment systems in Great Britain

Cited by 48 publications

References 22 publications

Coal-Mining Tailings as a Pozzolanic Material in Cements Industry

Coal-Mining Tailings as a Pozzolanic Material in Cements Industry

Characterization of Laciana Valley District mine water as geothermal resource

Coupled hydraulic and mechanical model of surface uplift due to mine water rebound: implications for mine water heating and cooling schemes

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