In the sewage systems fat deposits on the walls of pipes are suffering a series of chemical and biological transformations such as hydrolysis, saponification, oxidation, biochemical decomposition.
The reactions are catalyzed by the oxygen dissolved in water and the presence of micro-organisms and results in a penetrating and bad odor because of the formation of fatty acids. They are corrosive and attack pipelines, shortening their lifetime.
They are used and to avoid clogging the pipes due to the fats and organic oils insolubility that deposits on the walls of the pipelines. Section available for flow is reduced, the flow is reduced, even considerably.
Using the grease traps directly affects the functionality and effectiveness of treatment. Wastewater treatment is based on aerobic processes maintained by bubbling air and oxygen dissolved in water.
In sewage systems, the fat presence to the water surface and their ability to wet active sludge surface prevents the free exchange of oxygen and increases the treatment time. Moreover, fat is difficult digested by micro-organisms and require special means of disposal.