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Title: Chemical characterization of ash from gasification of alfalfa stems: Implications for ash management

Abstract

Electricity generation from biomass is an attractive option from an environmental perspective. Pilot studies have indicated that alfalfa (Medicago sativa L.) stems are suitable feedstock for energy generation via gasification. Detailed information on chemical characteristics of the ash generated from gasification of alfalfa stem is required to develop environmentally and economically sound ash management strategies. Alfalfa fly and bottom ashes were characterized with respect to chemical properties that are important in developing ash management practices with emphasis on beneficial utilization as a soil amendment. Mean concentrations of total C, K, Ca, and Cl were 424, 120, 85, and 26 g kg{sup {minus}1}, respectively, in fly ash. In bottom ash, the mean concentrations of C, K, and Ca, were 63, 61, and 193 g kg{sup {minus}1}. Concentrations of total Pb, As, Cd, Co, and Se were below detection limits in both ash types. Naphthalene ranged from 6.2 to 74 mg kg{sup {minus}1}, but concentrations of many other polyaromatic hydrocarbons were low or below mg kg{sup {minus}1} detection limits. Available K and P in fly ash were 90 to 120 and 8 to 10 g kg{sup {minus}1}, respectively. Mean CaCO{sub 3} equivalent value of fly ash was 400 g kg{sup {minus}1}, itsmore » electrical conductivity (EC) and pH were 127 dS m{sup {minus}1} and 11.5, respectively. These results suggest that when managed properly, gasified alfalfa ash could potentially be utilized as a beneficial soil amendment with few potential environmental concerns.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Minnesota, St. Paul, MN (US)
OSTI Identifier:
20080433
Resource Type:
Journal Article
Journal Name:
Journal of Environmental Quality
Additional Journal Information:
Journal Volume: 29; Journal Issue: 3; Other Information: PBD: May-Jun 2000; Journal ID: ISSN 0047-2425
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; BIOMASS; WASTE MANAGEMENT; GASIFICATION; ALFALFA; ASHES; CHEMICAL COMPOSITION; CARBON; POTASSIUM; CALCIUM; CHLORIDES; LEAD; ARSENIC; CADMIUM; COBALT; SELENIUM; NAPHTHALENE

Citation Formats

Mozaffari, M., Rosen, C.J., Russelle, M.P., and Nater, E.A. Chemical characterization of ash from gasification of alfalfa stems: Implications for ash management. United States: N. p., 2000. Web. doi:10.2134/jeq2000.00472425002900030035x.
Mozaffari, M., Rosen, C.J., Russelle, M.P., & Nater, E.A. Chemical characterization of ash from gasification of alfalfa stems: Implications for ash management. United States. doi:10.2134/jeq2000.00472425002900030035x.
Mozaffari, M., Rosen, C.J., Russelle, M.P., and Nater, E.A. Thu . "Chemical characterization of ash from gasification of alfalfa stems: Implications for ash management". United States. doi:10.2134/jeq2000.00472425002900030035x.
@article{osti_20080433,
title = {Chemical characterization of ash from gasification of alfalfa stems: Implications for ash management},
author = {Mozaffari, M. and Rosen, C.J. and Russelle, M.P. and Nater, E.A.},
abstractNote = {Electricity generation from biomass is an attractive option from an environmental perspective. Pilot studies have indicated that alfalfa (Medicago sativa L.) stems are suitable feedstock for energy generation via gasification. Detailed information on chemical characteristics of the ash generated from gasification of alfalfa stem is required to develop environmentally and economically sound ash management strategies. Alfalfa fly and bottom ashes were characterized with respect to chemical properties that are important in developing ash management practices with emphasis on beneficial utilization as a soil amendment. Mean concentrations of total C, K, Ca, and Cl were 424, 120, 85, and 26 g kg{sup {minus}1}, respectively, in fly ash. In bottom ash, the mean concentrations of C, K, and Ca, were 63, 61, and 193 g kg{sup {minus}1}. Concentrations of total Pb, As, Cd, Co, and Se were below detection limits in both ash types. Naphthalene ranged from 6.2 to 74 mg kg{sup {minus}1}, but concentrations of many other polyaromatic hydrocarbons were low or below mg kg{sup {minus}1} detection limits. Available K and P in fly ash were 90 to 120 and 8 to 10 g kg{sup {minus}1}, respectively. Mean CaCO{sub 3} equivalent value of fly ash was 400 g kg{sup {minus}1}, its electrical conductivity (EC) and pH were 127 dS m{sup {minus}1} and 11.5, respectively. These results suggest that when managed properly, gasified alfalfa ash could potentially be utilized as a beneficial soil amendment with few potential environmental concerns.},
doi = {10.2134/jeq2000.00472425002900030035x},
journal = {Journal of Environmental Quality},
issn = {0047-2425},
number = 3,
volume = 29,
place = {United States},
year = {2000},
month = {6}
}