The Closed Recycling System for Combination fish Culture and Hydroponic Vegetable Production

  • Takahiro-SAITO (National Aerospace Laboratory Space Technology Research Group) ;
  • Koji-OTSUBO (National Aerospace Laboratory Space Technology Research Group) ;
  • Lee, Gonigin (Tokyo University of Agriculture and Technology Dept. of Agricultural Engineering) ;
  • Seishu--TOJO (Tokyo University of Agriculture and Technology Dept. of Agricultural Engineering) ;
  • Kengo-WATANABE (Tokyo University of Agriculture and Technology Dept. of Agricultural Engineering) ;
  • I, Fusakazu-A (Tokyo University of Agriculture and Technology Dept. of Agricultural Engineering)
  • Published : 1993.10.01

Abstract

The constructed closed recycling system discussed in this technical report will be economically viable in future for the production of fish and vegetable in earth, space station and space colony, further, it will contribute a lot in the prevention of pollution in the world's ecological system. To make combined system, water management (Nitrification) is required, and it took 45 days to breed microorganism which facilitates this process. After this period , the recycle was confirmed to be working .Using derived equations, the expected nutrient characteristics of waste water were determined and it was found that the resulting nutrient balance was almost same as that in hydroponic solution when KOH was added to maintain pH level. Reverse osmosis (RO) system could solve the problem of the low nutrient concentration . It was found that plants grow well in fish waste water which was produced using RO system. RO system could combine fish and plant production through the advantageous use of separated high concentration water for plant and permeated water for fish in integrated combined system.