| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for treating nutrient liquid cultivation drainage which reutilizes a large portion of the drainage for cultivation due to sterilization or onset control of soil infectious disease bacteria in the nutrient liquid cultivation drainage by using a silver carrier, or the like, removes nitrate nitrogen to reduce it from drainage, or the like, not to be reutilized by utilizing sulfur denitrification to be a biological reaction, further removes to reduce phosphoric acid chemically or physicochemically by using soil generated in a purification plant, or the like, and is compatible with resource savings (fertilizer saving) and environmental preservation without adversely affecting a yield of crops, or the like, in nutrient liquid cultivation, by using simple facilities, easily, and effectively. <P>SOLUTION: This method provides a soil infectious disease control treatment on a portion of the drainage reutilized for crop cultivation in the nutrient liquid cultivation drainage, and on the other hand, removes nitrate nitrogen to reduce it by carrying out sulfur denitrification of the drainage or the excess water which is not reutilized for the crop cultivation to be discharged after phosphoric acid reduction treatment is carried out. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
