Alkaline stabilisation

Alkaline stabilisation is a chemical method designed to reduce sludge odour and putrescence (i.e. decay), and the level of pathogenic organisms. This is achieved by raising the pH of the sludge using lime. The process may be supplemented by dosing with waste solid materials to reduce the amount of lime used. Although adding material to the sludge increases its volume, the process is simple, effective and low in capital cost.