The major organic loading originates from human excreta, and is a complex mixture of fats, proteins, carbohydrates, lignin amino acids, sugars, celluloses, humic material and fatty acids. A large proportion of this organic material is in the form of both live and dead microorganisms which provide a large surface area ( m2 g-1 ) for sorption of hydrophobic organic residues and it is within this fraction that most synthetic organic compounds are located (ROGERS 1996). Waste waters and hence sewage sludges contain a wide variety of pathogens, which can be infectious for different species of animals and plants as well.
