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Biodegradation of B...
Biodegradation of Biosolids Under Aerobic Conditions : Implications for Cover Materials for Sulfide Mine Tailings Remediation
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- Nason, Peter (author)
- Univ Waterloo, Dept Earth & Environm Sci
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- Jia, Yu (author)
- Department of Environment and Raw Material, Greenland Institute of Natural Resources
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- Maurice, Christian (author)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Alakangas, Lena (author)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Öhlander, Björn (author)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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(creator_code:org_t)
- 2015-04-28
- 2016
- English.
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In: Mine Water and the Environment. - : Springer Science and Business Media LLC. - 1025-9112 .- 1616-1068. ; 35:3, s. 273-282
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Sewage sludge residue (biosolids) was investigated for its potential as a long-term tailings cover. Biosolids may prevent oxygen diffusion into underlying sulfide tailings through microbial aerobic biodegradation of organic matter. Biosolids were investigated at laboratory-, pilot-, and field-scale using analysis of total organic matter (TOM) mass reduction and O2, CO2, CH4 concentrations to quantify the biodegradation rate. A 156-day, open microcosm experiment, in which the loss of biosolids mass over time at differing temperatures, mimicking ambient (20–22 °C), mesophilic (34 °C), and thermophilic (50 °C) conditions, indicated that TOM biodegradation was best in the mesophilic temperature range, with 14.8, 27.2, and 26.7 % mass depletion at ambient, mesophilic, and thermophilic conditions, respectively. The data was correlated to field-scale data that evaluated biodegradation rates via decreasing O2 and increasing CO2 concentrations. Field biodegradation rates were less than laboratory rates because lower mean annual temperatures (0.6–0.7 °C) diminished microbial activity. A calibrated model indicates that 20 % of a field application of biosolids will degrade within 2 years. However, the rate declines with time due to exhaustion of the most readily degradable organic fraction. If biodegradation cannot be maintained, the long-term effectiveness of biosolids as a covering material for mine tailings remains a concern.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Keyword
- Applied Geology
- Tillämpad geologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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