Photocatalytic Treatment of Sormwater Runoff using Puralytics LilyPad Public Deposited

http://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/rx913r93r

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  • Stormwater picks up pollutants as it flows over impervious surfaces before ending up in water resources. Best management practices are implemented to remove pollutants from stormwater. Puralytics manufactures a stormwater treatment product called the LilyPad. The LilyPad consists of a titanium dioxide nanoparticle photocatalyst immobilized on polypropylene substrate. Treatment of stormwater by the LilyPad was tested both in the field, at the OSU-Benton County Green Stormwater Infrastructure Research (OGSIR) Facility and in the lab. NO₃⁻ , Cu²⁺, and Zn²⁺ removal by the LilyPad was investigated in the field using sunlight and in the lab using UV lamps. Total coliform removal was investigated in the lab using natural sunlight. Algae were more effective at removing NO₃⁻ than the LilyPad in the field. The LilyPad reduced NO₃⁻ to NO₂⁻ and NH₄⁺ in the lab for both collected stormwater and deionized water. Total coliform concentrations were reduced by 50% in the presence of the LilyPad and sunlight. Zn²⁺ removal was observed in the field but not in the lab. Cu²⁺ removal was observed in the lab but not in the field. More work is needed to confirm the LilyPads role in Zn²⁺ and Cu²⁺ removal.
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