The tank contained an estimated 1,000 tonnes of liquid and semi mobile solids. Access to the tank was very restricted meaning that the cleaning process had to be carried out by a fully trained confined space operative equipped with full breathing apparatus.
In order to gain access we were able to remove part of the roof so one of our manned mini-bulldozers could be lowered in.
With this in place we used a high-pressure water cannon to liquidise all of the sludge. Using the bulldozer, our operative was then able to push the sludge toward the suction of a pump situated outside the tank which sucked the sludge out and pumped it into a waiting tanker, ready for disposal.
The project took eight days from beginning to end and the client was completely satisfied. The AD plant was left ready for decommissioning.