coal ash Articles
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Competing Coal Ash Proposals
On May 4, 2010, the U.S. Environmental Protection Agency (EPA) issued its long-awaited proposal to manage coal ash – the byproduct of burning coal to generate power. The agency proposed two quite different approaches for regulating coal ash, somewhat to the consternation of critics, who had hoped for more stringent ...
By Acta Group
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Impact of alkaline oxide on coal ash fusion temperature
Ash fusion temperature (AFT) is an important index for coal gasification. A blend of fluxing agent with coal can decrease the AFT to meet the requirements of specific gasification process. Effect of alkaline oxide and silica alumina ratio on decreasing AFT is focused in this study. Simulation ash was used to investigate the effect of alkaline oxide on AFT. The experimental results showed that ...
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How toxic is coal ash? A laboratory toxicity case study
Under a consent agreement among EPA and proponents both for and against stricter regulation, EPA is to issue a new coal ash disposal rule by the end of 2014. Laboratory toxicity investigations often yield conservative estimates of toxicity since many standard test species are more sensitive than resident species, thus could provide information useful to the rule‐making. However, few laboratory ...
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Spatial and temporal trends in contaminant concentrations in Hexagenia nymphs following a coal ash spill at the Tennessee Valley Authority‘s Kingston Fossil Plant
A dike failure at the Tennessee Valley Authority (TVA) Kingston Fossil Plant in East Tennessee, United States, in December 2008 released approximately 4.1 million m3 of coal ash into the Emory River. From 2009 through 2012, samples of mayfly nymphs (Hexagenia bilineata) were collected each spring from sites in the Emory, Clinch, and Tennessee Rivers upstream and downstream of the spill. ...
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What equipment is used for coal ash dewatering ?
Coal ash refers to the semi-solid matter formed by the pulverized coal water. It is a product in the coal production process. Depending on the variety and formation mechanism, the nature of the coal is very different, and the availability is also quite different. The coal ash dewatering screen adopts the double-electric self-synchronization technology, the universal eccentric block, and the ...
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Review of coal as a promising source of lithium
Coals are a major source of pollution in certain parts of the world due to mining, coal combustion, and disposal of fly ash. The recovery of valuable rare metals from coals or coal–processing byproducts is a promising way to utilise these traditional resources economically, efficiently and in an environmentally friendly way. Lithium, a highly interesting metal, has been found dispersed and even ...
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Legal lookout: EPA responds to coal ash release
Once again, it took a major catastrophe to wake up industry and regulators to a problem that should have been addressed long ago. Dec. 22, 2008, was a nightmare for federal and state regulators, electrical utilities, and most particularly the residents of Kingston, Tenn. On this day, approximately 5.4 million cubic yards (or 1.1 billion gallons) of coal ash from the Tennessee Valley Authority ...
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EPA targets electric utilities - the agency steps up efforts to manage coal ash damage
Approximately 5.4 million cubic yards, or 1.1 billion gallons, of coal ash from the Tennessee Valley Authority (TVA) plant near Knoxville, Tenn., in December 2008 flooded some 300 acres of land, damaging property, polluting waterways, and killing fish. TVA will likely spend more than $500 million and perhaps as much as $1 billion dollars on the cleanup, says the U.S. Environmental Protection ...
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The use of tetragnathid spiders as bioindicators of metal exposure at a coal ash spill site
On December 22, 2008 a dike containing coal fly ash from the Tennessee Valley Authority Kingston Fossil Plant failed and resulted in the largest coal ash spill in U.S. history. This study was designed to determine sediment metal concentrations at multiple site locations and to determine if site‐specific bioaccumulation of metals existed in tetragnathid spiders. Selenium and nickel were the ...
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Using ordination and clustering techniques to assess multi‐metric fish health response following a coal ash spill
The effect of coal ash exposure on fish health in freshwater communities is largely unknown. Given the large number of possible pathways of effects (e.g., toxicological effect of exposure to multiple metals, physical effects from ash exposure, and food web effects), measurement of only a few health metrics is not likely to give a complete picture. We measured a suite of 20 health metrics from ...
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Legal lookout: competing coal ash proposals
Depending upon comments the EPA gathers, industry may have to or not have to close out their coal ash containment ponds within five years. On May 4, 2010, EPA issued its long-awaited proposal to manage coal ash – the byproduct of burning coal to generate power. The agency proposed two quite different approaches for regulating coal ash, somewhat to the consternation of critics, who had ...
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Researchers: Carcinogen Can Occur Naturally in Water
Representatives of the U.S. Fish & Wildlife Service and Duke Energy take samples on the Dan River, which was polluted by a coal ash spill. Scientists have found that hexavalent chromium in well water, long attributed to coal ash contamination, may occur naturally. Hexavalent chromium is a carcinogen found in drinking water supplies. Many have thought its presence is due to human activity, ...
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Air pollution in Deva-Hunedoara industrial area
ABSTRACT: In central part of Romania there is a very developed industrial area. This industrial area consist of a great number of industrial companies developed in three cities. In this area are the following cities: Deva (80000 inhabitants) where are developed cooper mining industries including processing plants, building material industries, heavy industries and a power station based on coal ...
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Capping of Coal Ash Landfill in Mallorca - Case Study
Project Details Capping of Coal Ash Landfill, C.T. Alcudia Location Mallorca, Baleares Islands (Spain) Products Used Resistex ST Cetcodrain 40X12-2 The increased use of coal to generate electricity has brought with it an increased amount of coal combustion by-products (CCBs). Metal ions released from these CCBs can be harmful to the environment and therefore need to be ...
By CETCO
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Application of Ecological Risk Assessment in Managing Residual Fly Ash in TVA's Watts Bar Reservoir, Tennessee
The Tennessee Valley Authority conducted a Baseline Ecological Risk Assessment (BERA) for the Kingston Fossil Plant ash release site to evaluate potential effects of residual coal ash on biota in Watts Bar Reservoir, Tennessee. The BERA was in response to a release of 4.1 million m3 of coal ash on December 22, 2008. It used multiple lines of evidence to assess risks for 17 different ecological ...
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Preparation and characterization of sorbents prepared from ash (waste material) for sulfur dioxide (SO2) removal
Sorbents synthesized from various types of ash (coal fly ash, coal bottom ash, oil palm ash, and incinerator ash) for flue gas desulfurization were investigated. The sorbents were prepared by mixing the ashes with calcium oxide and calcium sulfate using the water hydration method. The effects of various sorbent preparation variables, such as the hydration period, the ratio of calcium oxide to ...
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Relationship of chemical fractions of heavy metals with microbial and enzyme activities in sludge and ash-amended acid lateritic soil from India
The influence of metals, Cd, Cr, Cu, Ni, Pb and Zn, on the microbial biomass and enzyme activities of an amended acid lateritic soil were investigated under field conditions receiving a one-time application of 52 t ha–1 of sludge, coal ash and their mixtures at 1:3, 1:1 and 3:1 proportions, and including control and chemical fertilizer treatment at crop-specific recommended doses. Paddies and ...
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Low-permeability liner solution for coal-ash by-products
PROJECT: TVA Kingston Gypsum Pond Expansion LOCATION: Harriman, Tennessee PRODUCTS: BENTOMAT® 600CL BENTOMAT® CL EASY ROLLER™ Deployment System BACKGROUND: As part of its emissions control at the Kingston Fossil Plant, flue gas desulfurization is performed, which creates as a by-product a synthetic version of the mineral gypsum and must be stored in a gypsum pond or taken to a ...
By CETCO
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Precipitation of heavy metals from coal ash leachate using biogenic hydrogen sulfide generated from FGD gypsum
Investigations were undertaken to utilize flue gas desulfurization (FGD) gypsum for the treatment of leachate from the coal ash (CA) dump sites. Bench-scale investigations consisted of three main steps namely hydrogen sulfide (H2S) production by sulfate reducing bacteria (SRB) using sulfate from solubilized FGD gypsum as the electron acceptor, followed by leaching of heavy metals (HMs) from ...
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LMT5250TFSB Powerd Binder Spreader
We have cement spreader for sale! Function of Powerd Binder Spreader Mainly for roads cement spraying cold recycling, can also be used for a variety of subgrade stabilized soil spreading adhesive, Spreading object: Cement, Lime powder, Fly Coal ash …..Etc. Features of cement spreader truck 1. Loading spout has a dedicated, can also be feeding on the manhole; 2. Automatic Control, The ...
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