PURPOSE: A circulation type water culturing method is provided to collect and reuse waste nutrient solution. CONSTITUTION: A circulation type water culturing method comprises the following steps. A waste nutrient water collecting unit (100) collects waste nutrient solution from a bed for culturing. A waste nutrient solution storing unit (200) stores the waste nutrient solution supplied from the waste nutrient solution collecting unit. A nutrient solution storing unit (300) stores nutrient solution and acid. A raw water supplying unit (400) supplies raw water to the nutrient solution storing unit. A mixing unit (500) is provided with the waste nutrient solution, nutrient solution, and acid from the waste nutrient solution storing unit and nutrient solution storing unit, then mixes them, and supplies the mixture to the bed for culturing. A control unit (600) controls the operation of the waste nutrient solution collecting unit, waste nutrient storing unit, nutrient solution storing unit, raw water supplying unit, and mixing unit. The waste nutrient collecting unit comprises a water tank in which the collected waste nutrient solution is stored, and a filtering device which filters the waste nutrient supplied to the waste nutrient storing unit. The waste nutrient solution collecting unit comprises a water level control sensor. The waste nutrient solution storing unit comprises a waste nutrient solution temperature controller.본 발명은 순환식 수경재배 시스템을 이용한 순환식 수경재배 방법에 관한 것으로, 보다 상세하게는 폐양액을 재활용하는 순환식 수경재배 시스템 및 순환식 수경재배 방법에 관한 것이다. 본 발명에 의하면, 작물이 흡수하고 남은 폐양액을 회수하여 이를 재사용함으로써, 폐양액의 배출을 막아 수자원 및 토양 오염을 방지 할 수 있으며, 물과 비료 등의 사용을 줄여 작물의 생산 원가를 절감할 수 있다.
