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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
journal contribution
posted on 2023-05-17, 09:46 authored by Oakes, JM, Eyre, BD, Donald RossDonald RossTo 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
History
Publication title
Environmental Science and Technology (Washington)Volume
45Issue
8Pagination
3400-3406ISSN
0013-936XDepartment/School
Institute for Marine and Antarctic StudiesPublisher
American Chemical SocietyPlace of publication
Washington, USARights statement
Copyright © 2011 American Chemical SocietyRepository Status
- Restricted