Effects of land application of municipal biosolids on nitrogen-fixing bacteria in agricultural soil |
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| Authors: | Leigh M Holt Andrew E Laursen Lynda H McCarthy I Vadim Bostan Alison L Spongberg |
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| Institution: | (1) Environmental Applied Science and Management Program, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada;(2) Department of Chemistry and Biology, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada;(3) Golder Associates Ltd, 220-1755 Springfield Road, Kelowna, BC, V1Y 5V5, Canada;(4) Department of Environmental Sciences, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA; |
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| Abstract: | Effects of municipal biosolids on microbial N2-fixation in agricultural soil were assessed in a 3-month laboratory study which included analysis of metals, pharmaceuticals,
and personal care products. Reference agricultural soil was amended with organic manure or municipal biosolids from a southern
Ontario wastewater plant, with a biosolids-only treatment included to evaluate metabolic activity in this inoculum. Microbial
N2-fixation in reference and manure-amended soils were similar (p = 0.144) over 3 months and lower than in biosolids-amended soil (p = 0.001); however, differences among soil treatments decreased over time, with no significant difference at test termination.
In general, one-time application of biosolids caused short-term stimulation of N2-fixing activity with a return to reference conditions within 3 months. Although no residual effects were detected, biosolids
introduced elevated levels of metals, pharmaceuticals, personal care products (particularly analgesics), and viable bacteria;
long-term effects caused by repeat applications (as commonly practiced) requires further investigation. |
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