The separators of fats, commonly called “degreasers”, are currently regulated by Regulation UNI EN 1825 Part 1 and 2, and must be used whenever it becomes necessary to separate from sewage waters both the fats and oils of vegetable and animal origin. According to the norms indicated, the prefabricated degreasers in armed concrete must be certified by the producer in order to assure the following: 

• the concrete and the iron casings of the reservoirs conform respectively with the specifications referred to in points 5.2.2 and 5.4.2 of UNI EN 1825-1;
   

• the nominal diameters of the piping of water outflow conform with the limits prescribed by prospectus 1 of UNI EN 1825-1 and the respective lines of flow with respect to the hydraulic profiles indicated in point 5.3.9 of the same norm;
   

• the volume of the siphon for sludge is in compliance with the limit prescribed in point 6,4 of UNI EN 1825-2;
   

• the basic size of the degreaser is defined by the results of tests carried out at a testing plant of the same typology by means of the pilot equipment specified in point 8.5.1 of UNI EN 1825-1, and following the test methodology prescribed by the same norm.

The choice of the basic size of the degreaser for a specific application is carried out following the calculation methodology described in point 6 of UNI EN 1825-2. The system will be installed in correspondence with the prescription of point 7 of UNI EN 1825-2.

The degreaser provides for the removal of fats and oils from waters of muddy substances by employing one single fortified monolithic reservoir of two deflectors. In this way the degreaser works in two phases: the first provides the separation and accumulation of the solid sediments (sludge, lime, sand, etc), while the second one provides the separation and accumulation of the floating suspensions (fats and oils of vegetable and animal origin).

The entrance ductwork is equipped with an entrance deflector that reduces the speed and maintains uniform water flow in the compartment, while the exit ductwork is supplied with a foam exit deflector.

The waters to be treated enter into the reservoir. The solid sediments are deposited on the bottom, while the decanted water and the lighter substances congregate at the surface and the underlying clarified water flows beyond the foam deflector ending in the drainage duct.

Periodically it is necessary to provide for the extraction of the solids, oils, and fats accumulated in the degreaser.

Thus conformed and equipped, under the condition that the cargo is compatible with its basic size, the degreaser is in a position to remove the fats and oils of vegetable and animal origin that are present in the water until a residual content reaches 25 mg/l.

Separation system of fats constituted of a degreaser, of the MUSILLI NS W160 series, is manufactured with monolithic reservoirs prefabricated in reinforced vibrated concrete to high resistance verified for street cargos of antiseismic category 1, and complete with with cover slab prefabricated in carriageable reinforced vibrated concrete verified for cargos of antiseismic category 1 with inspections bumper to bumper and D400 class valves.

The degreaser system is dimensioned and constructed according to regulation UNI EN 1825 parts 1 and 2. Compartments and the related piping and entrance and exit deflectors of the water for all the degreasers of the series are dimensioned in conformity with the minimum values established from table 1 and point 5.5 of regulation UNI EN 1825-1. The system is constructed by a company in possession of Business Quality System certification of UNI EN ISO 9001:2008 and is ICMQ certified.