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Effect of Lake Shinji periphyton upon phosphorus sorption by concrete

Effect of Lake Shinji periphyton upon phosphorus sorption by concrete. WOLFE, June – Baylor University and Texas AgriLife Research NONAKA, Tsuguhiro – Shimane University KUWABARA, Tomoyuki SOMURA, Hiroaki. Periphyton : attached benthic community consisting mainly of algae and bacteria.

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Effect of Lake Shinji periphyton upon phosphorus sorption by concrete

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  1. Effect of Lake Shinji periphyton upon phosphorus sorption by concrete WOLFE, June – Baylor University and Texas AgriLife Research NONAKA, Tsuguhiro – Shimane University KUWABARA, Tomoyuki SOMURA, Hiroaki

  2. Periphyton : attached benthic community consisting mainly of algae and bacteria Background • Periphyton removes phosphorus from water • (Craggs 2001, Dodds 2003) • Concrete sorbs phosphorus from water • (Molle et al. 2003, Sato et al. 2004, Park and Tai 2004, Takio et al. 2007) • Hypotheses: • Periphyton may prefer specific recycled concrete material (RCM) • Periphyton-covered RCM may differ in phosphorus sorption behavior • RCM may be engineered to optimize most favorable periphyton condition Recycled Concrete Materials (RCM): a mixture of Portland cement and various aggregates with differing sorption capacities

  3. Questions P 15 30.97 • What is the phosphorus affinity of RCM? • What is the effect of RCM upon periphyton growth? • What is periphyton effect upon phosphorus sorption by RCM? • Is phosphorus sorbed to RCM available to periphyton?

  4. Recycled Concrete Material (RCM) Kimachi Rock Recycled Concrete Foamed Glass

  5. Methods – Periphyton Establishment Research site near Izumo Attach RCM Deploy 2-5 weeks Harvest

  6. Methods – Lab Procedures Sample Preparation Biomass Taxonomy / Spectrophotometry

  7. What is the phosphorus affinity of RCM? • Equilibrate RCM at 1, 5, 10, 50, 100, 500 mg P L-1 for 48 hrs • Plot equilibrium concentration vs P sorbed per gram RCM • Fit Langmuir model to describe the isotherm • Equilibrate RCM in 500 mg L-1 P for 48 hrs • Sample at 0, 6, 12, 24, and 48 hours • Plot P sorption as a function of time

  8. Sorption isotherm for RCM equilibrated 48 hrs @ 26 ºC, dashed line indicates Langmuir fit of the data

  9. Sorption isotherm for RCM equilibrated 48 hrs @ 26 ºC, dashed line indicates Elovich fit of the data

  10. Summary

  11. Lake Shinji Conditions

  12. What is the effect of RCM on periphyton growth? - Biomass

  13. What is the effect of RCM on periphyton growth? - Biomass

  14. What is the effect of RCM on periphyton growth? - Biomass

  15. What is the effect of RCM on periphyton growth? - Biomass

  16. What is the effect of RCM on periphyton growth? - Biomass

  17. Periphyton common to Lake Shinji • Green filamentous algae • Rhizoclonium sp. • Enteromorpha sp. • Cladophora sp. • Diatoms • Melosira virans • Pleurosira laevis • Cymbella spp. • Navicula spp. • Nitzschia spp. • Functional groups • Green filamentous • Single pinnate diatom • Chain pinnate diatom • Chain centric diatom

  18. What is the effect of RCM on periphyton growth? - Taxonomy

  19. What is periphyton effect upon phosphorus sorption by RCM? • Method: • Deploy RCM into Lake Shinji for 3 weeks • Kill periphyton on half of RCM • Place RCM in 500 ml lake water • Add 1 mg L-1 phosphorus (as KH2PO4) • Collect water samples over time • Analyze water for phosphorus concentration P

  20. What is periphyton effect upon phosphorus sorption by RCM?

  21. What is periphyton effect upon phosphorus sorption by RCM? • Method: • Deploy RCM into Lake Shinji for 3 weeks • Place periphyton covered RCM in 500 ml lake water • Place RCM (no periphyton) in 500 ml lake water • Add 1 mg L-1 phosphorus (as KH2PO4) • Collect water samples over time • Analyze water for phosphorus concentration P

  22. What is periphyton effect upon phosphorus sorption by RCM?

  23. Is phosphorus sorbed to RCM available to periphyton? • Load RCM materials with SRP (as KH2PO4) • 1, 5, 10, 50, 100 mg L-1 • Place P-loaded materials into Lake Shinji • Allow periphyton to colonize for ~3 weeks • Analyze entire substrate for Chlorophyll a

  24. Is phosphorus sorbed to RCM available to periphyton?

  25. Conclusions • RCM exhibited different P sorption capacities based on composition • Lake Shinji periphyton rapidly colonized all three RCM, showing no preference • Periphyton biofilms appeared to negatively affect dissolved P sorption by RCM • Increasing amounts of P sorbed to RCM exhibited both null (rock, concrete) and positive (foamed glass)effects upon periphyton biomass accumulation

  26. Acknowledgments • Japan Society for the Promotion of Science - Funding • U.S.A. National ScienceFoundation - Funding • Shimane University, Matsue, Japan • Dept. of Ecology and Environmental Science • Dr. Tsughiro Nonaka – Host Researcher • Dr. Tomoyuki Kuwabara - Research advice • Dr. Hiroaki Somura – Research support • Mr. KazuhisaTakahashi – Technical support • Ms. Kanatsu Yuki – Transportation • Mr. Takahiro Fukuoka – Technical support • Texas AgriLife Research, Temple, Texas • Dr. Dennis Hoffman • Baylor University, Waco, Texas • Dr. Owen Lind

  27. Questions? Photo by Dr. Ichiro Matsumoto

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