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Author: Robert C. Streeter
Publisher:
ISBN:
Category : Acid mine drainage
Languages : en
Pages : 136
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Book Description
Bench scale batch experiments were performed on sludges obtained from line neutralization of coal mine drainage in an attempt to alleviate present problems in sludge handling and disposal. Tests were of an exploratory nature and did not afford sufficient data for cost analyses. Ferro Magnetic sludge densification, filter aids, coagulant aids, heating, freeze drying, and coprecipitation of calcium carbonate through addition of CO2 were tested. Of these, freeze drying, CO2 addition, and ferro magnetic treatment were shown to be feasible alternatives to present disposal methods. Each of these methods resulted in settled sludge volume reduction of approximately 90% and increases in sludge solids contents of from 0.5 to about 5% after 30 min. settling periods. The ferro magnetic process has the advantages of possible recovery of a useful product, and elimination of costly settling lagoons, but is very sensitive to aluminum and requires a considerable amount of heat. Sludge freezing is the simplest conceptual approach and is apparently effective for any lime produced sludge. The CO2 addition method offers the possibility of partial recovery and recycling of both CaO and CO2 through sludge calcination.
Author: Robert C. Streeter
Publisher:
ISBN:
Category : Acid mine drainage
Languages : en
Pages : 136
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Book Description
Bench scale batch experiments were performed on sludges obtained from line neutralization of coal mine drainage in an attempt to alleviate present problems in sludge handling and disposal. Tests were of an exploratory nature and did not afford sufficient data for cost analyses. Ferro Magnetic sludge densification, filter aids, coagulant aids, heating, freeze drying, and coprecipitation of calcium carbonate through addition of CO2 were tested. Of these, freeze drying, CO2 addition, and ferro magnetic treatment were shown to be feasible alternatives to present disposal methods. Each of these methods resulted in settled sludge volume reduction of approximately 90% and increases in sludge solids contents of from 0.5 to about 5% after 30 min. settling periods. The ferro magnetic process has the advantages of possible recovery of a useful product, and elimination of costly settling lagoons, but is very sensitive to aluminum and requires a considerable amount of heat. Sludge freezing is the simplest conceptual approach and is apparently effective for any lime produced sludge. The CO2 addition method offers the possibility of partial recovery and recycling of both CaO and CO2 through sludge calcination.
Author: R. C. Streeter
Publisher:
ISBN:
Category : Acid mine drainage
Languages : en
Pages : 0
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Author: U.S. Environmental Protection Agency. Water Quality Office
Publisher:
ISBN:
Category :
Languages : en
Pages : 200
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Author: U.S. Environmental Protection Agency
Publisher: BiblioGov
ISBN: 9781295277445
Category :
Languages : en
Pages : 128
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Book Description
The U.S. Environmental Protection Agency (EPA) was introduced on December 2, 1970 by President Richard Nixon. The agency is charged with protecting human health and the environment, by writing and enforcing regulations based on laws passed by Congress. The EPA's struggle to protect health and the environment is seen through each of its official publications. These publications outline new policies, detail problems with enforcing laws, document the need for new legislation, and describe new tactics to use to solve these issues. This collection of publications ranges from historic documents to reports released in the new millennium, and features works like: Bicycle for a Better Environment, Health Effects of Increasing Sulfur Oxides Emissions Draft, and Women and Environmental Health.
Author: West Virginia University. Coal Research Bureau
Publisher:
ISBN:
Category : Acid mine drainage
Languages : en
Pages : 110
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Book Description
Sludge formed by the neutralization of acid mine drainage is generally affected by the acid mine water composition and the method of neutralization used. The effects of both raw water chemistry and the various treatment processes on sludge composition are enumerated for each treatment process. The methods discussed include: Conventional lime neutralization; Mechanical aeration; Lagoon aeration; pH; and Sludge recirculation. Several other processes, described and studied in slightly more detail, include the High Density Sludge Process, the Densator Process, the Elpo Treatment Process, and the use of magnetic sludge. Methods of thickening, conditioning and dewatering are also presented, with vacuum filtration appearing as the most feasible.
Author: United States. Enviornmental Protection Agency
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
Author: R. H. Sprute
Publisher:
ISBN:
Category : Coal mine waste
Languages : en
Pages : 76
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Author:
Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 368
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Author: Bituminous Coal Research (Monroeville)
Publisher:
ISBN:
Category :
Languages : en
Pages : 113
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Author: United States. Environmental Protection Agency. Office of Program Management
Publisher: Washington : U.S. Environmental Protection Agency, Office of Research and Development
ISBN:
Category : Environmental protection
Languages : en
Pages : 324
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Book Description
