| 摘要 |
PURPOSE:To remove very fine grains from sediment contained in muddy water and to reduce the viscosity of the muddy water. CONSTITUTION:After being used for excavation, muddy water 18 is delivered from the inside of a channel 16 to a primary processing apparatus 20, where coarse grains are removed from sediment contained in the muddy water. After being made free of coarse grains through the primary processing apparatus 20, primary processed water 22 is delivered to a screw decanter 23, where fine grains are removed from sediment. After being made free from fine grains, intermediately processed water 25 is delivered to a secondary processing vessel 26, where very fine grains are removed from sediment. The secondary processing vessel 26 has a pair of opposedly installed electrode plates 28, 28, to which DC voltage is applied. After being processed in the secondary processing vessel 26, secondary processed water is supplied with a dispersant from a dispersion tank 30. |
