TY - JOUR
T1 - A Floating Island Treatment System for the Removal of Phosphorus from Surface Waters
AU - Brown, Mark T.
AU - Boyer, Treavor
AU - Sindelar, R. J.
AU - Arden, Sam
AU - Persaud, Amar
AU - Brandt-Williams, Sherry
N1 - Funding Information:
Funding for this research was from the Lake Jesup Total Phosphorus Removal Treatment Technologies Floating Island Pilot Project (25104) of St. Johns River Water Management District , Palatka, FL, USA.
Publisher Copyright:
© 2018 THE AUTHORS
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/10
Y1 - 2018/10
N2 - The goal of this project was to design, build, and test a pilot-scale floating modular treatment system for total phosphorus (TP) removal from nutrient-impaired lakes in central Florida, USA. The treatment system consisted of biological and physical–chemical treatment modules. First, investigations of prospective biological and physical–chemical treatment processes in mesocosms and in bench-scale experiments were conducted. Thirteen different mesocosms were constructed with a variety of substrates and combinations of macrophytes and tested for TP and orthophosphate (PO4 3-) removal efficiencies and potential areal removal rates. Bench-scale jar tests and column tests of seven types of absorptive media in addition to three commercial resins were conducted in order to test absorptive capacity. Once isolated process testing was complete, a floating island treatment system (FITS) was designed and deployed for eight months in a lake in central Florida. Phosphorus removal efficiencies of the mesocosm systems averaged about 40%–50%, providing an average uptake of 5.0 g·m−2·a−1 across all mesocosms. The best-performing mesocosms were a submerged aquatic vegetation (SAV) mesocosm and an algae scrubber (AGS), which removed 20 and 50 mg·m−2·d−1, respectively, for an average removal of 5.5 and 12.0 g·m−2·a−1 for the SAV and AGS systems, respectively. Of the absorptive media, the best performance was alum residual (AR), which reduced PO4 3- concentrations by about 75% after 5 min of contact time. Of the commercial resins tested, the PhosX resin was superior to the others, removing about 40% of phosphorus after 30 min and 60% after 60 min. Under baseline operation conditions during deployment, the FITS exhibited mean PO4 3- removal efficiencies of 53%; using the 50th and 90th percentile of PO4 3- removal during deployment, and the footprint of the FITS system, yielded efficiencies for the combined FITS system of 56% and 86%, respectively, and areal phosphorus removal rates between 8.9 and 16.5 g·m−2·a−1.
AB - The goal of this project was to design, build, and test a pilot-scale floating modular treatment system for total phosphorus (TP) removal from nutrient-impaired lakes in central Florida, USA. The treatment system consisted of biological and physical–chemical treatment modules. First, investigations of prospective biological and physical–chemical treatment processes in mesocosms and in bench-scale experiments were conducted. Thirteen different mesocosms were constructed with a variety of substrates and combinations of macrophytes and tested for TP and orthophosphate (PO4 3-) removal efficiencies and potential areal removal rates. Bench-scale jar tests and column tests of seven types of absorptive media in addition to three commercial resins were conducted in order to test absorptive capacity. Once isolated process testing was complete, a floating island treatment system (FITS) was designed and deployed for eight months in a lake in central Florida. Phosphorus removal efficiencies of the mesocosm systems averaged about 40%–50%, providing an average uptake of 5.0 g·m−2·a−1 across all mesocosms. The best-performing mesocosms were a submerged aquatic vegetation (SAV) mesocosm and an algae scrubber (AGS), which removed 20 and 50 mg·m−2·d−1, respectively, for an average removal of 5.5 and 12.0 g·m−2·a−1 for the SAV and AGS systems, respectively. Of the absorptive media, the best performance was alum residual (AR), which reduced PO4 3- concentrations by about 75% after 5 min of contact time. Of the commercial resins tested, the PhosX resin was superior to the others, removing about 40% of phosphorus after 30 min and 60% after 60 min. Under baseline operation conditions during deployment, the FITS exhibited mean PO4 3- removal efficiencies of 53%; using the 50th and 90th percentile of PO4 3- removal during deployment, and the footprint of the FITS system, yielded efficiencies for the combined FITS system of 56% and 86%, respectively, and areal phosphorus removal rates between 8.9 and 16.5 g·m−2·a−1.
KW - Floating island treatment
KW - Lake ecosystem
KW - Phosphorus removal
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U2 - 10.1016/j.eng.2018.08.002
DO - 10.1016/j.eng.2018.08.002
M3 - Article
AN - SCOPUS:85053299303
VL - 4
SP - 597
EP - 609
JO - Engineering
JF - Engineering
SN - 2095-8099
IS - 5
ER -