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Biodegradation of Biosolids Under Aerobic Conditions: Implications for Cover Materials for Sulfide Mine Tailings Remediation
Univ Waterloo, Dept Earth & Environm Sci.
Department of Environment and Raw Material, Greenland Institute of Natural Resources.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0001-7585-4017
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0001-7291-8585
Vise andre og tillknytning
Rekke forfattare: 52016 (engelsk)Inngår i: Mine Water and the Environment, ISSN 1025-9112, E-ISSN 1616-1068, Vol. 35, nr 3, s. 273-282Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2016. Vol. 35, nr 3, s. 273-282
HSV kategori
Forskningsprogram
Tillämpad geologi
Identifikatorer
URN: urn:nbn:se:ltu:diva-15882DOI: 10.1007/s10230-015-0339-3ISI: 000382193900002Scopus ID: 2-s2.0-84928624256Lokal ID: f734105d-fe2c-485f-8869-7e75ca81458cOAI: oai:DiVA.org:ltu-15882DiVA, id: diva2:988858
Merknad

Validerad; 2016; Nivå 2; 2016-10-18 (andbra)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Jia, YuMaurice, ChristianAlakangas, LenaÖhlander, Björn

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