To dispose bottom sediments which are pollution sources for a closed water basin by effectively utilizing the aquatic plants growing in this closed water basin as ground water pollution preventive materials, water purifying materials, soil conditioning materials, etc.
A stage for executing establishment. of a dredging soil disposal plant 3 adjacently to the closed water basin 1 and laying the carbonized aquatic plants to the bottom and sidewalls of this dredging soil disposal plant, a stage for reclaiming the dredging soil formed by dredging of the polluted bottom sediments of the closed water basin into the dredging soil disposal plant 3, a stage for adding and mixing the carbonized aquatic plants to and with the inside of the dredging soil, a stage for planting the aquatic plants into the dredging soil disposal plant after the completion of the reclamation of the dredging soil and a stage for producing the carbonized aquatic plants by cutting the grown aquatic plants and producing the carbonized aquatic plants by carbonizing the same are repeated.
KASHIUCHI TAKANOBU
NIWA CHIAKI
