METHOD AND APPARATUS FOR REMOVING NUTRITIOUS SALT WITH AQUATIC PLANT

摘要

PURPOSE:To efficiently cultivate an aquatic plant all the year round, by supplying eutrophicated water to the initial-end tank of a module tank group constructed by a desired number of tanks communicated together and let contain the aquatic plant in them, and taking out a grown-up aquatic plant outside the system. CONSTITUTION:Eutrophicated water is pumped up from a crude water tank 13 to a high-level water tank 12, and continuously fed into a module water tank 4a at the initial-end position of a series of each module 4 in a manner such that the water level is held constant. As a result, the eutrophicated water 24 is supplied to each water tank 4 up to a level suitable for cultivation of an aquatic plant such as a duckweed. A sufficient amount of natural light penetrates through a roof 1a and a wall 1b into the interior of a building 1 having closed structure to collect the natural light. The natural light is irradiated to the aquatic plant 20 inside each module water tank 4. The proliferated grown-up aquatic plant 20 is entirely ladled out from the tanks by every tank unit and discharged outside the system.