| 摘要 |
PROBLEM TO BE SOLVED: To realize a hydroponic method, a hydroponic system, a culture method and a culture system by which ozone can be dissolved in a nutritious solution and then removed. SOLUTION: A nutritious solution 21 stored in a culture bed 20 is discharged into an ozone-dissolving tank 30, and ozone gas is introduced into the ozone- dissolving tank 30 from a gas-diffusing pipe 15, thus generating ozone bubbles 32 in the nutritious solution to dissolve the ozone in the nutritious solution. Thereby, the nutritious solution can be sterilized. The ozone-dissolved nutritious solution 31 is filtered through a filter 33 to remove impurities, and then flowed into an ozone-decomposing tank 40. Air is introduced from a gas-diffusing pipe 16 into the ozone-decomposing tank 40 to generate bubbles in the nutritious solution, thus decomposing the ozone. Thereby, the concentrations of nutrients in the nutritious solution are not lowered, because the changes of iron, manganese, calcium, and the like, in the nutritious solution into insoluble oxides such as iron oxide due to the ozone and the subsequent precipitation of the insoluble oxides can be prevented. |
