3 edition of Aqueous and precipitate chemistry of coal mine drainage water in alkaline environments found in the catalog.
Aqueous and precipitate chemistry of coal mine drainage water in alkaline environments
Caroline M. Loop
|Statement||by Caroline M. Loop|
|The Physical Object|
|Pagination||xv, 255 p.|
|Number of Pages||255|
Acid mine drainage (AMD) is commonly treated by lime neutralization to produce an alkaline sludge in which heavy metals are stabilized and mobilization is inhibited. Brady, K.B.C., and Cravotta, C.A., III () Acid base accounting--An improved method of interpreting overburden chemistry to predict the quality of coal-mine drainage, in Proceedings 13th Annual Meeting West Virginia Surface Mine Drainage Task Force: Morgantown, , West Virginia University, 10 p.
In addition to causing poor water quality, mine drainage can affect the substrate of a stream. Ferrous iron (Fe 2+) is oxidized to ferric iron (Fe 3+) to form a precipitate on the substrate. Mismanagement of mine waste rock can mobilize acidity, metal (loid)s, and other contaminants, and thereby negatively affect downstream environments. Hence, strategic long-term planning is required to prevent and mitigate deleterious environmental impacts. Technical frameworks to support waste-rock management have existed for decades and typically combine static and kinetic testing, field-scale.
(). Iron oxyhydroxide coating of pyrite for acid mine drainage control. Applied Geochemistry (). Kinetics of the removal of iron pyrite from coal by microbial catalysis. (). Leachate Chemistry of Mixtures of Fly Ash and Alkaline Coal Refuse. Mine Water Quality Prediction at Surface Coal Mines in the United States Robert L. P. Kleinmann National Energy Technology Laboratory, U.S. Dept. of Energy P.O. Box , Pittsburgh, PA, USA Abstract. This paper briefly summarizes the contents of a recently completed book on the subject of predicting water quality at surface coal mines.
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This practice was validated by recent studies applying the reagents Ca(OH) 2 and NaOH at pH and to treat acid mine drainage from a coal mine [6,7].All neutralizing treatments resulted in a satisfactory reduction in the metal concentration, with the best results achieved using Ca(OH) 2 at pHalthough Mn and As remained above or near the maximum limits for discharge according to the Author: Karine Batista dos Santos, Vítor Otacílio de Almeida, Jéssica Weiler, Ivo André Homrich Schneider.
Javier Sánchez España, in Thermodynamics, Solubility and Environmental Issues, 1 INTRODUCTION. The behavior of iron and aluminum in acid mine drainage (AMD) has been thoroughly studied during the last three decades [1–5] and the minerals controlling their solubility have been identified and investigated in detail [6–14].Thus, ferric iron is known to be mostly dissolved under very.
Acid mine drainage, acid and metalliferous drainage (AMD), or acid rock drainage (ARD) is the outflow of acidic water from metal mines or coal mines.
Acid rock drainage occurs naturally within some environments as part of the rock weathering process but is exacerbated by large-scale earth disturbances characteristic of mining and other large construction activities, usually within.
Acid mine drainage (AMD) continues to be a concern in coal mining because it reduces surface water and groundwater quality (Verburg et al., ) and may perhaps persist for several years.
In the U.S. only, AMD pollutes o km of streams (Skousen et al., ).Author: Bharat Sharma Acharya, Gehendra Kharel. 1. INTRODUCTION. The behavior of iron and aluminum in acid mine drainage (AMD) has been thoroughly studied during the last three decades [, ] and the minerals controlling their solubility have been identified and investigated in detail [,, ].Thus, ferric iron is known to be mostly dissolved under very acidic conditions (pH Cited by: Aqueous and precipitate chemistry of coal mine drainage water in alkaline environments [microform] / Caroline M.
Loop Thesis (Ph. D.)--Pennsylvania State University, From a thermodynamic stand-point, Se O 3 2-remains stable within a pE+pH range of –, and above this value Se VI O 4 2-predominates in soil solutions (Elrashidi et al., ); thus, occurrence of these two Se species is probable in coal mine environments where mining activity exposes soils to atmospheric oxidative conditions.
Acid mine drainage (AMD) Acid mine drainage (AMD) is the runoff produced when water comes in contact with exposed rocks containing sulfur-bearing minerals that react with water and air to form sulfuric acid and dissolved iron.
This acidic run-off dissolves heavy metals including copper, lead, and mercury which pollute ground and surface water. Mine drainage is formed when pyrite (an iron sulfide) is exposed and reacts with air and water to form sulfuric acid and dissolved iron.
Some or all of this iron can precipitate to form the red, orange, or yellow sediments in the bottom of streams containing mine drainage.
The acid runoff further dissolves heavy metals such as copper, lead, and. EPA promulgated the Coal Mining Effluent Guidelines and Standards (40 CFR Part ) inand amended the regulation in, and The regulation covers wastewater discharges from mine drainage, coal storage facilities, and coal preparation plants.
The adsorption properties of Fe-rich precipitates in acid mine drainage (AMD) systems differ from those of pure hydrous iron(III) oxides, and this can lead to inaccurate predictions of trace metal adsorption and attenuation.
Adsorption edges for Cu, Pb, Zn and Cd adsorption onto a poorly ordered, goethite-bearing iron(III) oxy hydroxy sulfate, precipitated in an AMD system in New Zealand, have.
Mine wastes/historic mine sites: Coal mining is a well known source of low pH, particularly where sulfur-bearing rock is present. Drainage from other mines and mine wastes can also be very acidic.
Acid generating rocks/soils: Interactions between rocks or soils and water (i.e., weathering) can generate acid. For example, andesite soils of the.
Various analyses of physico-chemical characteristics and batch tests were conducted with the sludge obtained from a full-scale electrolysis facility for treating coal mine drainage in order to find the applicability of sludge as a material for removing Zn(II) in an aqueous phase. The physico-chemical analysis results indicated that coal mine drainage sludge (CMDS) had a high specific surface.
A treatment process for Acid mine drainage (AMD) using coal fly ash (CFA) was developed. AMD was treated with CFA as the alkaline agent at different CFA: AMD ratios and pH, electrical conductivity (EC) evolution monitored over time.
In a separate experiment two AMD sources with differing chemistry were treated with the same CFA to evaluate the impact of AMD chemistry. The first book in the field to encompass theory and practice, Environmental Chemistry: Fundamentals covers the chemical and biochemical processes that take place in air, water, soil, and living.
The chemistry of AMD is perfectly suited to concentrate its damage on streams and waterways. First, the very low pH of coal mine runoff (zero to ) holds aqueous Fe(II) and Fe(III) in solution. Then, when the runoff meets a stream and becomes diluted or contacts carbonate rocks, the slightly higher pH causes Fe(OH) 3 to precipitate.
Even if. By using the logarithm scale, this mine-drainage water would betimes more acidic than neutral water -- so stay out of abandoned mines. Variation of pH across the United States. The pH of precipitation, and water bodies, vary widely across the United States.
Natural and human processes determine the pH of water. The precipitation of dissolved aluminum is among the most important geochemical processes affecting the water chemistry and trace metal dynamics of acid mine drainage (AMD).
Metal sulfides are exposed to aqueous and oxidizing conditions in coal mines, producing sulfuric acid and dissolved metals which drain into waterways as coal-mine drainage (CMD). This metal-rich effluent impairs the ecologic and economic value of surface waters; however, current CMD remediation options can be invasive and costly.
Strongly alkaline fluidized bed combustion (FBC) ash is commonly used to control acid mine drainage (AMD) in West Virginia coal mines. Objectives include acid neutralization and immobilization of the primary AMD pollutants: iron, aluminum, and manganese.
The process has been successful in controlling AMD though doubts. from mine sites in PA, from very alkaline to highly acidic.
The metals concentrations found in mine drainage can vary from Mine drainage tends to be either alkaline or acidic, with pH ~3 or ~6. The presence or lack of carbonates strongly affects shallow groun dwater chemistry. Chapter 2.
Groundwater Flow on the.Disruption of coal strata during mining accelerates pyrite oxidation by exposing greater surface areas of the reactive mineral to weathering. Acidic water in a coal mine in the Niangziguan spring watershed is related to this process and is characterized by low pH (min.
) and high sulfate (max. mg/I), iron (max. mg/I), and hardness (max. mg/I). The influence of commodity, climate, mine or process facility, and mine phase on the nature of the mine drainage (ARD, NMD or SD) can be illustrated using Ficklin diagrams or analogue versions.
Ficklin diagrams are plots that can be used to interpret variations in mine drainage water chemistry between different deposits (Plumlee et al., ).