caa a22 4500 445893508 CHVBK 20180317145624.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10750-009-0071-8 doi (NATIONALLICENCE)springer-10.1007/s10750-009-0071-8 Effects of a modified zeolite on P and N processes and fluxes across the lake sediment-water interface using core incubations [Elektronische Daten] [Max Gibbs, Deniz Özkundakci] A new locally produced P-inactivation agent, Z2G1, was tested on sediment cores from Lake Okaro, New Zealand, for phosphorus (P) removal efficacy and any non-target side effects prior to a whole lake trial to manage internal P loading. Z2G1 is a granular product which settles rapidly, and was designed as a sediment capping material. It is a modified zeolite which acts as a carrier for the aluminium (Al)-based P-binding agent. It was found to have a high affinity for P and did not release Al into the water column. Continuous-flow incubation study results showed that a thin layer of Z2G1 (~2mm) could completely block the release of P from the sediment under aerobic and anoxic conditions, and remove P from the overlying water in contact with the capping layer. The Z2G1 capping layer neither released metals itself nor did it induce the release of metals from the sediments, and the zeolite substrate absorbed arsenic and mercury from the geothermally influenced Lake Okaro sediments. In general, zeolites are strong cation absorbers and the zeolite substrate of Z2G1 absorbed ammoniacal nitrogen, making it the only sediment capping material to actively remove both P and N. There were, however, indications of a suppression effect on microbial denitrification by the Z2G1 capping layer under aerobic conditions. Overall, the Z2G1 sediment capping material is a highly effective P-inactivation agent which might be a useful material for managing internal P loads in eutrophic lakes. Springer Science+Business Media B.V., 2010 Internal load nationallicence P-inactivation agent nationallicence Sediment capping nationallicence Lake restoration nationallicence Modified zeolite nationallicence Phosphorus nationallicence Nitrogen nationallicence Lake Okaro nationallicence Gibbs Max National Institute of Water and Atmospheric Research Ltd, PO Box 11-115, Hamilton, New Zealand aut Özkundakci Deniz Centre for Ecology and Biodiversity Research, University of Waikato, Private Bag 3105, Hamilton, New Zealand aut Hydrobiologia Springer Netherlands 661/1(2011-02-01), 21-35 0018-8158 661:1<21 2011 661 10750 https://doi.org/10.1007/s10750-009-0071-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-009-0071-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gibbs Max National Institute of Water and Atmospheric Research Ltd, PO Box 11-115, Hamilton, New Zealand aut NATIONALLICENCE 700 1- Özkundakci Deniz Centre for Ecology and Biodiversity Research, University of Waikato, Private Bag 3105, Hamilton, New Zealand aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 661/1(2011-02-01), 21-35 0018-8158 661:1<21 2011 661 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer