1. ADAS Environment, 2001. The Safe Sludge Matrix. Available from: .
2. Using pH as control parameter for aerobic/anoxic sludge digestion;Al-Ghusain;Journal of Environmental Engineering,1995
3. APHA, AWWA, WPCF, 1992. In: Rhodes Trussell (Ed.), Standard methods for the examination of water and wastewater, eighteenth ed., Washington, DC, USA.
4. ATP, oxygen uptake rate and INT-dehydrogenase activity of actinomycete foams;Awong;Water Research,1985
5. Coello, Ma.D., 1996. Determinación de la Actividad de los lodos de una planta de tratamiento de aguas residuales. Tesis de Licenciatura. Universidad de Cádiz.