Sustainability assessment and comparison of efficacy of four P-inactivation agents for managing internal phosphorus loads in lakes: sediment incubations

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dc.contributor.authorGibbs, Max M.
dc.contributor.authorHickey, Christopher W.
dc.contributor.authorÖzkundakci, Deniz
dc.date.accessioned2010-10-08T03:39:47Z
dc.date.available2010-10-08T03:39:47Z
dc.date.issued2010
dc.description.abstractA novel application of a continuous flow incubation system (CFIS) was used to assess four phosphorus (P) inactivation agents—alum, Phoslock™, a new modified zeolite (Z2G1 or Aqual-P™), and allophone—when used as sediment capping agents to manage internal P loads in lakes. The CFIS technique allowed combined efficacy and sustainability assessment, including: (1) flux measurements during simulation of stratified (anoxic) and mixed (aerobic) conditions on the same sediment through multiple cycles to assess the longevity of a range of product doses; (2) simulation of a summer algal bloom collapse and subsequent burial of the products; and (3) investigation of non-target effects on nitrification and denitrification processes at the sediment–water interface. Minimum P-removal dose rates were found to differ substantially at 80 g m⁻² for alum, 190 g m⁻² for Z2G1, 220 g m⁻² for allophane and 280 g m⁻² for Phoslock™, for similar capping layer thickness of about 2 mm, and would be effective for at least 4 years. All products temporarily suppressed nitrification and denitrification under aerobic conditions, and it may be important to minimise product application to any permanently aerobic zones, such as the littoral areas of a lake. While the aluminium (Al)-based products did not enhance Al fluxes in the CFIS, lanthanum (La) was released at a near constant rate of around 2 mg La m⁻² day⁻¹ from the Phoslock™ treatments over a period of at least 14 days. Spatial variability of sediment P, bioturbation, and burial are factors that will affect up-scaling these results to a whole lake.en_NZ
dc.identifier.citationGibbs, M.M., Hickey, C.W. & Özkundakci, D. (2010). Sustainability assessment and comparison of efficacy of four P-inactivation agents for managing internal phosphorus loads in lakes: sediment incubations. Hydrobiologia, 658(1), 253-275.en_NZ
dc.identifier.doi10.1007/s10750-010-0477-3en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/4673
dc.language.isoen
dc.publisherSpringeren_NZ
dc.relation.isPartOfHydrobiologiaen_NZ
dc.relation.urihttp://www.springerlink.com/content/t26w7525348296h2/en_NZ
dc.subjectlake restorationen_NZ
dc.subjectinternal P loaden_NZ
dc.subjectP-inactivation agentsen_NZ
dc.subjectalumen_NZ
dc.subjectPhoslock™en_NZ
dc.subjectmodified zeoliteen_NZ
dc.subjectallophaneen_NZ
dc.subjectsediment cappingen_NZ
dc.subjectphosphorusen_NZ
dc.subjectnitrogenen_NZ
dc.subjectsustainabilityen_NZ
dc.titleSustainability assessment and comparison of efficacy of four P-inactivation agents for managing internal phosphorus loads in lakes: sediment incubationsen_NZ
dc.typeJournal Articleen_NZ
pubs.begin-page253en_NZ
pubs.elements-id36614
pubs.end-page275en_NZ
pubs.issue1en_NZ
pubs.volume658en_NZ
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