HYDRATED LIME PASTES CONTAINING COAL-FLY ASH AND POLYAMINOPHENOLIC ADDITIVES FOR THE INERTIZATION OF FLY ASHES FROM MUNICIPAL SOLID WASTES INCINERATORS

Conditioning of sludges improves dewatering characteristics and reduces the quantity of sludge to be handled. Anaerobic digested sludge collected from a sewage treatment plant contained 1.8% to 8% oil. The increase of specific resistance and capillary suction time (CST) with increasing oil content observed in these samples indicates the interference of oil in dewatering. It has been found that addition of municipal solid wastes incinerator fly ash decreases the specific resistances and capillary suction times of oily sludges rapidly up to 3% dosage. Beyond 3% fly ash, the decrease is less significant and the solids content in the sludge cake increases. This optimum dosage remains the same for sludges with varying oil contents from 1.8% to 12%. The total suspended solids of filtrate decreases with fly ash dosage but the toxic concentrations of heavy metals increases considerably. However at the optimum dosage of 3%, concentrations of heavy metals are within the limits for discharging into the sewers. The correlations of CST with the dewatering characteristics such as specific resistance, filter yield and corrected filter yield are established. These correlations can be used to obtain a quick prediction on dewaterability.

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Removal of Phenol from Aqueous Solution by Adsorption on to Coal Fly Ash

Adsorption Science & Technology ◽

10.1177/026361749601300609 ◽

1996 ◽

Vol 13 (6) ◽

pp. 527-536 ◽

Cited By ~ 16

Author(s):

L.J. Alemany ◽

M.C. Jiménez ◽

M.A. Larrubia ◽

F. Delgado ◽

J.M. Blasco

Keyword(s):

Aqueous Solution ◽

Fly Ash ◽

Removal Efficiency ◽

Ph Value ◽

Coal Fly Ash ◽

Solid Wastes ◽

Power Stations ◽

Different Temperatures ◽

Coal Power ◽

Coal Power Stations

The present work examines the possible use of fly ash, a byproduct of coal power stations, as a means of removing phenol from water, or equivalently, of restricting its movement in solid wastes or soil. Equilibrium experiments were performed to evaluate the removal efficiency of fly ash. The adsorption experiments were undertaken using fly ash treated at three different pH levels and with three different temperatures. The results indicate that although phenol can be removed from water, this depends markedly on the temperature and pH value of the treatment solution employed.

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Removal of Aqueous Natural Organic Pollutants Using Mixed Mining Solid Wastes: Coal Fly Ash and Iron Sludge

International Journal of Scientific Research in Environmental Sciences ◽

10.12983/ijsres-2014-p0220-0227 ◽

2014 ◽

Vol 2 (6) ◽

pp. 220-227

Author(s):

Edith Sebata ◽

Benias Chomunorwa Nyamunda ◽

Ngceboyakwethu Primrose Zinyama ◽

Upenyu Guyo ◽

Mambo Moyo

Keyword(s):

Fly Ash ◽

Organic Pollutants ◽

Coal Fly Ash ◽

Solid Wastes

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98/00707 Conditioning of oily sludges with municipal solid wastes incinerator fly ash

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(97)85974-7 ◽

1998 ◽

Vol 39 (1) ◽

pp. 59

Keyword(s):

Fly Ash ◽

Solid Wastes ◽

Municipal Solid Wastes

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Characterization of North American Lignite Fly Ashes II. XRD Mineralogy

MRS Proceedings ◽

10.1557/proc-113-99 ◽

1987 ◽

Vol 113 ◽

Cited By ~ 2

Author(s):

G. J. McCarthy ◽

D. M. Johansen ◽

A. Thedchanamoorthy ◽

S. J. Steinwand ◽

K. D. Swanson

Keyword(s):

Fly Ash ◽

Bituminous Coal ◽

Coal Fly Ash ◽

Fly Ashes ◽

X Ray ◽

Mining Areas ◽

Lignite Fly Ash ◽

Coal Fly Ashes ◽

Ferrite Spinel

ABSTRACTX-ray powder diffraction has been used to determine the crystalline phase mineralogy in samples of fly ash from each of the lignite mining areas of North America. The characteristic phases of North Dakota lignite fly ashes were periclase, lime, merwinite and the sulfate phases anhydrite, thenardite and a sodalite-structure phase. Mullite was absent in these low-Al2O3 ashes. Montana lignite ash mineralogy had characteristics of ND lignite and MT subbituminous coal fly ashes; mullite and C3A were present and the alkali sulfates were absent. Texas and Louisiana lignite fly ashes had the characteristic mineralogy of bituminous coal fly ash: quartz, mullite, ferrite-spinel (magnetite) and minor hematite. Even though their analytical CaO contents were 7–14%, all but one lacked crystalline CaO-containing phases. Lignite fly ashes from Saskatchewan were generally the least crystalline of those studied and had a mineralogy consisting of quartz, mullite, ferrite spinel and periclase. Quantitative XRD data were obtained. The position of the diffuse scattering maximum in the x-ray diffractograms was indicative of the glass composition of the lignite fly ash.

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