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DatoValore
TitleRemediation of internal phosphorus loads with modified clays, influence of fluvial suspended particulate matter and response of the benthic macroinvertebrate community.
AbstractClay-based phosphorus (P) sorbents have been increasingly used as geoengineering materials for the management sediment-derived internal P loading in eutrophic lakes. However, the long-term behavior of these sorbents has remained elusive along with their response to burial under suspended particulate matter (SPM), and their effect on macroinvertebrate communities occupying dynamic regions at the sediment-water interface of shallow and turbid lakes. In this study, field mesocosm experiments were undertaken in Lake Chaohu, China, to study the effects of the application of lanthanum-modified bentonite (LMB) and thermally-modified calcium-rich attapulgite (TCAP) on sediment internal P loading and to assess their influence on macroinvertebrate community structure. A complementary laboratory core incubation study was also undertaken to investigate the effects of SPM deposition on LMB and TCAP performance. In the field, both LMB and TCAP effectively intercepted P released from sediment for up to five months. A P fractionation analysis indicated that LMB and TCAP application results in a substantial increase in inert P fractions in sediment. Laboratory studies indicated that deposition of SPM may increase in mobile P both in the upper sediment and across the new post-SPM deposition sediment-water interface. Importantly, a comparison of sediment chemical extractions and estimated P fluxes suggests that chemically-defined forms of P in the sediment may be used as a proxy to estimate the net sediment P flux. Significantly, the surficial application of either LMB or TCAP did not cause negative effects on macroinvertebrate communities. This study indicates that to sustain a low P flux across the sediment-water interface in shallow, turbid lakes, repeat dosing of geoengineering materials, temporally aligned to the deposition of fluvial SPM, may be required.
SourceScience of the total environment 610-611, pp. 101–110
KeywordsSediment internal PmanagementGeoengineering materialsSuspended particulate matterP fluxBenthicmacroinvertebrate community
JournalScience of the total environment
EditorElsevier, Lausanne ;, Paesi Bassi
Year2018
TypeArticolo in rivista
DOI10.1016/j.scitotenv.2017.07.243
AuthorsYin, Hongbin; Douglas, Grant B; Cai, Yongjiu; Liu, Cheng; Copetti, Diego
Text375462 2018 10.1016/j.scitotenv.2017.07.243 ISI Web of Science WOS WOS 000411897700013 Sediment internal Pmanagement Geoengineering materials Suspended particulate matter P flux Benthicmacroinvertebrate community Remediation of internal phosphorus loads with modified clays, influence of fluvial suspended particulate matter and response of the benthic macroinvertebrate community. Yin, Hongbin; Douglas, Grant B; Cai, Yongjiu; Liu, Cheng; Copetti, Diego State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing, China. Electronic address hbyin@niglas.ac.cn. Clay based phosphorus P sorbents have been increasingly used as geoengineering materials for the management sediment derived internal P loading in eutrophic lakes. However, the long term behavior of these sorbents has remained elusive along with their response to burial under suspended particulate matter SPM , and their effect on macroinvertebrate communities occupying dynamic regions at the sediment water interface of shallow and turbid lakes. In this study, field mesocosm experiments were undertaken in Lake Chaohu, China, to study the effects of the application of lanthanum modified bentonite LMB and thermally modified calcium rich attapulgite TCAP on sediment internal P loading and to assess their influence on macroinvertebrate community structure. A complementary laboratory core incubation study was also undertaken to investigate the effects of SPM deposition on LMB and TCAP performance. In the field, both LMB and TCAP effectively intercepted P released from sediment for up to five months. A P fractionation analysis indicated that LMB and TCAP application results in a substantial increase in inert P fractions in sediment. Laboratory studies indicated that deposition of SPM may increase in mobile P both in the upper sediment and across the new post SPM deposition sediment water interface. Importantly, a comparison of sediment chemical extractions and estimated P fluxes suggests that chemically defined forms of P in the sediment may be used as a proxy to estimate the net sediment P flux. Significantly, the surficial application of either LMB or TCAP did not cause negative effects on macroinvertebrate communities. This study indicates that to sustain a low P flux across the sediment water interface in shallow, turbid lakes, repeat dosing of geoengineering materials, temporally aligned to the deposition of fluvial SPM, may be required. 610 611 Published version http //dx.doi.org/10.1016/j.scitotenv.2017.07.243 Remediation ... pdf Yin_et_al_2018_SciTotEnv.pdf Articolo in rivista Elsevier 0048 9697 Science of the total environment Science of the total environment Sci. total environ. diego.copetti COPETTI DIEGO