PROCESSING METHOD FOR POLLUTED BOTTOM SEDIMENT AT BOTTOM OF WATER

摘要

PROBLEM TO BE SOLVED: To provide a processing method for polluted bottom sediment at the bottom of water, by which the widely spreading polluted bottom sediment can be processed economically and efficiently.;SOLUTION: A waterflow 10 having a density higher than that of bottom water is formed and sent along a polluted bottom 1 of water toward a recess 6 at the bottom 1, and the bottom 1 is agitated to suspend the bottom sediment 3 in the waterflow 10. A turbid waterflow 12 of a high density raised by suspending the polluted bottom sediment 3 is used to collect the bottom sediment 3 of the bottom 1 in the recess 6 for processing. Preferably, the high-density water flow 10 is formed by discharging water 21 of a high specific gravity onto the bottom 1 via a discharge pipe 14 with its lower end opened to the bottom 1. Further preferably, an agitating member 17 arranged at the lower end of the discharge pipe 14 is used to agitate the bottom sediment 3. Microbubbles are mixed into the high-density water flow 10 to suppress the precipitation of the suspended bottom sediment 3, and the turbid waterflow 12 mixed with the microbubbles supplies oxygen to the polluted bottom sediment at the bottom 1 for cleaning.;COPYRIGHT: (C)2005,JPO&NCIPI