The use of lime (often in the form of lime milk) to treat liquid sludge facilitates the coagulation of colloid particles, increasing the size of the sludge "flakes" and its dry matter content. This makes it easier to filter the sludge and also improves the performance of dehydration equipment.
Lime is normally applied where press filters are used. However, adding lime also makes it possible to eliminate infectious germs by increasing the pH level of the sludge and preventing fermentation, thus reducing odours.
