A particular case of the generation of large quantities of pollutant solid wastes is the water treatment plants for human consumption (Richter, 1991; Bernardo and Dantas, 2005). Traditionally, the final destination of municipal sludge from water treatment plants has been water systems nearest to no treatment. This causes environmental problems such as the risk to aquatic life, increasing the amount of solids, changes in the color and turbidity, sedimentation, increase of the concentrations of metals from the waste, and may cause public health risks
(Oliveira, 2004). A crucial issue is to find an ecological destination for final destination of the water treatment plant
waste.