A Comparison of Three Different Hydroponic Sub-systems (gravel bed, floating and nutrient film technique) in an Aquaponic Test System
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- 作者：Wilson A. Lennard and Brian V. Leonard
- 关键词：Aquaponic ; Hydroponic ; NFT ; Biological nutrient removal ; Wastewater ; Murray Cod ; Nitrate ; Phosphate
- 刊名：Aquaculture International
- 出版年：2006
- 出版时间：December, 2006
- 年：2006
- 卷：14
- 期：6
- 页码：539-550
- 全文大小：182 KB
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Hydrobiology - 出版者：Springer Netherlands
- ISSN：1573-143X
文摘
Murray Cod, Maccullochella peelii peelii (Mitchell), and Green Oak lettuce, Lactuca sativa, were used to test for differences between three hydroponic subsystems, Gravel Bed, Floating Raft and Nutrient Film Technique (NFT), in a freshwater Aquaponic test system, where plant nutrients were supplied from fish wastes while plants stripped nutrients from the waste water before it was returned to the fish. The Murray Cod had FCR's and biomass gains that were statistically identical in all systems. Lettuce yields were good, and in terms of biomass gain and yield, followed the relationship Gravel bed > Floating > NFT, with significant differences seen between all treatments. The NFT treatment was significantly less efficient than the other two treatments in terms of nitrate removal (20% less efficient), whilst no significant difference was seen between any test treatments in terms of phosphate removal. In terms of dissolved oxygen, water replacement and conductivity, no significant differences were observed between any test treatments. Overall, results suggest that NFT hydroponic sub-systems are less efficient at both removing nutrients from fish culture water and producing plant biomass or yield than Gravel bed or Floating hydroponic sub-systems in an Aquaponic context. Aquaponic system designers need to take these differences into account when designing hydroponic components within aquaponic systems.