In Cyanowater We have dredges to remove the sludge, as well as biological methods to digest sludge naturally.
Sludge digestion is produced by adding specific bacteria that solubilize and digest it, being the result of this process CO2 that is released into the water. It is a slow process, but it has the advantage of being much cheaper than dredging and less invasive, since there is no machinery or works.