Sludge dredging method

Abstract

Abstract PURPOSE: To provide an efficient dredging of sludge which permits grab dredging without diffusion of drifting sludge while preventing the inflow of surrounding sludge into the zone after the removal of sludge in the zone. CONSTITUTION: Sludge-accumulated area is designated by a zone 2. A gelling agent, for example, water glass affiliated chemical (sodium silicate or potassium silicate) and acidity neutrolizing agent (mineral acid, CO 2 or the like) are injected into the aludge (bottom) layer 5 in the zone 2 and mixed together. The sludge layer 5 is gelled thoroughly in the zone 2 at the original position to eliminate the fluidity and diffusivity of the sludge. With the removal of the sludge in the zone 2, the dredging is performed. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Nobuyuki Yoshida
• 👤 Etsuo Ogino
• 👤 Takao Arai
• 👤 Noboru Negishi
• 👤 Akira Okada
• 👤 Naojiro Oshita

Bibliographic Details