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Short-Term Enhancement and Long-Term Suppression of Denitrification in Estuarine Sediments Receiving Primary - and Secondary - Treated Paper and Pulp Mill Discharge

Citation

Oakes, JM and Eyre, BD and Ross, DJ, Short-Term Enhancement and Long-Term Suppression of Denitrification in Estuarine Sediments Receiving Primary - and Secondary - Treated Paper and Pulp Mill Discharge, Environmental Science and Technology (Washington), 45, (8) pp. 3400-3406. ISSN 0013-936X (2011) [Refereed Article]


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Copyright Statement

Copyright © 2011 American Chemical Society

DOI: doi:10.1021/es103636d

Abstract

To determine the role of sediment denitrification in removing inputs of primary- (PE) and secondary-treated effluent (SE) from a pulp and paper mill (PPM), organic matter (OM) associated with PE (residual wood fiber) and SE (activated sludge biomass and phytoplankton) was added to estuarine intertidal sediments and denitrification rates were measured over 27 days. Labile sludge biomass and phytoplankton initially stimulated denitrification, including for pre-existing sediment N. After 2.5 d, however, denitrification was suppressed apparently due to microbial competition forNto process the refractory (high C:N) material remaining. Wood fiber suppressed denitrification throughout the experiment due to competition for N to process the refractory OM. Ultimate long-term denitrification suppression by phytoplankton is offset by initial enhanced denitrification rates. Although nutrient release during degradation of sludge biomass and wood fiber may stimulate phytoplankton production, N equivalent to 127% of the expected daily phytoplankton load was denitrified within 24 h, allowing for permanent removal

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquatic Ecosystem Studies and Stock Assessment
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Coastal and Estuarine Environments
Author:Ross, DJ (Dr Jeff Ross)
ID Code:75057
Year Published:2011
Web of Science® Times Cited:12
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2012-01-05
Last Modified:2012-05-22
Downloads:0

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