| 摘要 |
<p>PURPOSE:To perform activated sludge treatment of a deposit in a closed water region while it is fixed at the present site by a method wherein a sludge of the deposit is fixed by means of a container wherein the upper face plate and the side face plate are integrated and there exists no bottom face plate and preliminary aeration stirring, activated sludge treatment and afterward stirring stabilization processes are performed in this order and then, the container is pulled out. CONSTITUTION:A container 2 with no bottom face plate is penetrated into the ground slab below a sludge 3 by discharging water in the container 2 and making the inside of the container vacuum by means of a feeding and discharging pump 17. Then, preliminary aeration stirring of the sludge 3 fixed in the container 2 is performed by means of an aeration stirring installation 11. Then, an activated sludge is fed from an activated sludge tank 10 to perform activated sludge treatment. Time required for the activated sludge treatment is determined by the data of a preliminarily performed test and a dissolved oxygen meter. At the stage where the activated sludge treatment is finished and circulating liq. is separated, a part of the activated sludge is pulled out and when the remaining activated sludge is unstable, it is stabilized by feeding and stirring an inorg. solidifying agent. Then, water is fed into the container 2 and it is pressurized by means of the feeding and discharging pump 11 to float the container up for pulling it out.</p> |
