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Using aquatic plants to remove nutrients from aquaculture wastewater. How does aquaculture introduce nitrogen into the environment?. Fish feeds contain nitrogen compounds large amounts of waste. Traditional separation machinery settling ponds. Constructed wetlands hydroponics.

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Presentation Transcript
how does aquaculture introduce nitrogen into the environment
How does aquaculture introduce nitrogen into the environment?
  • Fish feeds contain nitrogen compounds
  • large amounts of waste
mechanisms to reduce nitrogen
Traditional separation machinery

settling ponds

Constructed wetlands

hydroponics

Mechanisms to reduce nitrogen
case studies
Case Studies

Lin et al. (2003)

ammonia 57%, nitrite 90%, nitrate 68%

mississippi state university
Mississippi State University

Ammonia 63%

Nitrite 97%

Nitrate 80%

experimental design
Experimental Design
  • 4 aquaria all containing 30g tilapia
  • 2 of the 4 aquaria containing Giant Salvinia
  • water quality parameters (ammonia, nitrite, nitrate) measured weekly
  • difference in nitrogen levels between tanks with aquatic plants and those without?
conclusions experimental modifications
Conclusions/Experimental modifications
  • Salvinia may be able to effect nitrogen at very low concentrations
  • No effect at higher concentrations
  • Questionable for use in aquaculture
  • Light for Salvinia
  • replications
  • extend length of experiment
references
References
  • Posadas, B.C. 2003. Use of constructed wetlands to improve water quality in finfish production. Mississippi State University. http://www.msstate.edu/dept/crec/cwres.html
  • Lin, Y-F., Jing, S-R., Lee, D-Y. 2003. The potential use of constructed wetlands in a recirculating aquaculture system for shrimp culture. Environmental Pollution. 123: 107-113.
  • Seawright, D., Stickney, R., Walker, R. 1998. Nutrient dynamics in integrated aquaculture-hydroponics systems. Aquaculture. 160: 215-237

Photos

  • Michael, J. H. Jr. 2003. Nutrients in salmon hatchery wastewater and its removal through the use of a wetland constructed to treat off-line settling pond effluent. Aquaculture. 226: 213-225
  • Tilapia:www.sun.ac.za/kie/unistel/ aquaculture/aquastel/
  • Catfish: www.fish2go.com/info6.htm
  • Constructed wetland: http://www.msstate.edu/dept/crec/cwres.html
  • Shrimp: whyfiles.org/025chem_weap/ 7.html
  • Aquaponics(1): http://www.hamburger-umweltinst.org/biomass/mnlwide/img33.gif
  • Aquaponics (2): www.aquaranch.com/ aquapon.html
  • Salvinia: http://www.wapms.org/images/salvinia2.jpg