The waste enters the plant after passing through the radiometric gate and the entrance weighing station to calculate the gross weight; the vehicles unload the waste into the pit and leave the plant after being weighed a second time to determine the unladen weight. The plant is equipped with a pit with a capacity of around 10,500 m3 for the unloading and storage of waste, of which 7,000 m3 can be exploited. This area is sealed and kept at a constant vacuum thanks to the intake of the primary combustion air produced. There are 2 bridge cranes inside the pit with a capacity of 10 t each, both equipped with 5 m3 capacity polyp grabs, which are operated by trained waste management crane operators.

The section relating to the waste to energy plant is composed of three separate waste disposal lines each with a theoretical capacity of 204 t/day making a total capacity of 612 t/day (with a reference LCV of 2,280 kcal/kg 9,544 kJ/kg). Each line is composed of an incinerator, a boiler and a combustion fumes treatment system. The grate installed on Line 2 is Martin technology, air cooled horizontal type and the incinerator is the semi adiabatic type with a reduced area for the membrane lined walls in order to optimise energy recovery, which essentially takes place in the recovery boiler installed downstream of the incinerator. On the first and third lines the grate is also the Martin technology, horizontal moving plane type, but it is a development of Line 2: there is a mixed cooling system, both air and water and, the boiler, which acts as an incinerator, is installed above the grate. This is known as an integrated incinerator boiler system, where energy recovery is higher. On line 2 at the combustion chamber outlet the gases are directed towards the post combustion chamber where the oxidation reactions begun earlier are completed. The fumes are kept at a temperature of 850 gradiC for more than two seconds, as required by Legislative Decree 152/06. On lines 1 and 3 the temperature control takes place in the actual combustion chamber (there is no proper physically separate post combustion chamber, only a post combustion area) where there are two burners which, if there is a fall in temperature, are activated to keep the process temperature above the regulatory limits. A burner (one for each line), running on methane, ensures the starting and stopping stages so that the minimum temperature is 850 gradiC before the waste is introduced and it guarantees it for the entire time the waste is present.

Downstream of the post combustion chamber of the incinerator for Lines 1 and 2 there is a vertical recovery boiler; above the grate on Lines 1 and 3 there is a vertical and horizontal recovery boiler (integrated incinerator boiler system).

• the steam generator on Line 1 has a capacity of approximately 29 t/h of steam at a temperature of 380 gradiC and a pressure of 39 bar (23.9 MWt);
• the steam generator on Line 2 has a capacity of 21 t/h of steam at a temperature of 380 gradiC and a pressure of 39 bar (21.7 MWt);
• the steam generator on Line 3 has a capacity of 26 t/h of steam at a temperature of 380 gradiC and a pressure of 39 bar (21.7 MWt).

The fume capacity is approximately 50,000 Nm3/h for each of the three lines. The fume treatment is broken down, for each line, into different phases:

• reduction of the nitrogen oxides through SNCR DeNox (Selective Non Catalytic Reduction) using urea;
• treatment of acid gases through the injection of sodium bicarbonate in a dry reactor. The sodium bicarbonate is injected by means of a pneumatic transport system which can inject up to 150 kg/h arriving at a rate of 400 kg/h through the reserve system;
• injection of activated carbon into the dry reactor to reduce the micro pollutants and heavy metals which has an injection capacity of up to 30 kg/h;
• dust removal through a bag filter made up of four modules with 240 bags each making a total of 960 bags for each line. The total filtration area is 1,819 m2;
• single stage cleaning column with the injection of a soda solution for the removal of traces of acid gases and heavy metals still present in the fumes;
• fume post heating at a temperature of 120 gradiC through a fume fume heat exchanger with an anti plume function;
• release of the fumes into the atmosphere via extraction fans and a chimney with three flues (height 100 m; flue diameter 1.4 m).

The plant is equipped with a single steam turbine serving the three lines coupled with an alternator designed to produce electricity at 10 kV. The theoretical gross electricity power generated is 14.9 MW. The three incineration lines operate independently of one another in order to guarantee the incineration process if there is a stoppage at one of them. The thermal cycle, in addition to the main condenser, is equipped with an auxiliary condenser which enables the steam produced at the three lines to be absorbed even if there is no turbine in order to be able to fulfil the waste disposal function if the turbine is out of service. The condensation of the steam takes place through an evaporation tower supplied by mains water. Until September 2013, the electrical configuration of the plant involved the total transfer to the 27.5 kV grid of the energy produced, while all the energy needed to cover the consumption of the plant was taken from the AcegasApsAmga external 10 kV grid. From October 2013, this configuration was changed and the current arrangement involves the electricity produced supplying all the plant consumers with only the excess transferred to the 27.5 kV grid. As a result energy is no longer drawn from the 10 kV grid.