| Autor: |
Jeke, Nicholson N.1, Zvomuya, Francis1 francis.zvomuya@umanitoba.ca, Ross, Lisette2 |
| Předmět: |
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| Zdroj: |
Journal of Environmental Quality. Nov/Dec2015, Vol. 44 Issue 6, p1883-1891. 9p. |
| Abstrakt: |
Nitrogen (N) availability affects plant biomass yield and, hence, phytoextraction of contaminants during phytoremediation of end-of-life municipal lagoons. End-of-life lagoons are characterized by fluctuating moisture conditions, but the effects on biosolid N dynamics have not been adequately characterized. This 130-d laboratory incubation investigated effects of three moisture levels (30, 60, and 90% water-filled pore space [WFPS]) on N mineralization (Nmin) in biosolids from a primary (PB) and a secondary (SB) municipal lagoon cell. Results showed a net increase in Nmin with time at 60% WFPS and a net decrease at 90% WFPS in PB, while Nmin at 30% WFPS did not change significantly. Moisture level and incubation time had no significant effect on Nmin in SB. Nitrogen mineralization rate in PB followed threehalf-order kinetics. Potentially mineralizable N (N0) in PB was significantly greater at 60% WFPS (222 mg kg-1) than at 30% WFPS (30 mg kg-1), but rate constants did not differ significantly between the moisture levels. Nitrogen mineralization in SB followed first-order kinetics, with N0 significantly greater at 60% WFPS (68.4 mg kg-1) and 90% WFPS (94.1 mg kg-1) than at 30% WFPS (32 mg kg-1). Low Nmin in SB suggests high-N-demanding plants may eventually have limited effectiveness to remediate biosolids in the secondary cell. While high Nmin in PB would provide sufficient N to support high biomass yield, phytoextraction potential is reduced under dry and near-saturated conditions. These results have important implications on the management of moisture during phytoextraction of contaminants in end-oflife municipal lagoons. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
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