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Waste-to-energy plant


This plant belongs to Prima srl company and is run by Ambiente 2000 company, both belonging to Falck Group. It disposes of the waste by combustion and produces electrical energy. Only municipal solid waste (the dry weight deriving from separate collection and bulky waste) and similar waste can be accepted, for a total amount of about 550 t/d. The waste comes from the municipalities located east and north of Milan. The electrical energy produced, up to 19 megawatts of power, is let into the Enel system. The plant is regularly inspected and monitored, also by the Municipality of Trezzo and by the neighbouring municipalities.

For further information and contacts, please visit this website: www.termotrezzo.it

Inter-municipal committee of inspection

The Committee was appointed according to art. 7 of the agreement with PRIMA srl and T.T.R. srl companies and to the Regulation adopted by resolutions No. 56 and 57 of 25.07.2002. Go to Regulation no.61

Members: 5 representatives of the Municipality – 3 representatives of the municipalities neighbouring the area of the plant – 1 representative of the CEM

Current members:
1.      Ceresoli Flavio, representative of the Municipality of Trezzo
2.      Caccia Alessandro, representative of the Municipality of Trezzo
3.      Gallina Riccardo, representative of the Municipality of Trezzo 
4.      Balestra Marco, technical committee of the Municipality of Trezzo
5.      Utica Giovanni, technical committee of the Municipality of Trezzo 
6.      Corti Giuseppe, representative of the Municipality of Pozzo 
7.      Di Martino Giuseppe, representative of CEM e of neighbouring municipalities 
8.      Solcia Michele, representative of the Municipality of Grezzago
9.      Pirotta Ruggero, representative of the Municipality of Vaprio

1. Existing plant

The waste-to-energy plant of Trezzo for recycling the dry weight of municipal solid waste to produce electrical energy belongs to Prima srl company, which belongs to Actelios spa (Falck Group). Privately proposed by former TTR (the present Actelios) in accordance with the procedures provided for by law 21/93, since the provincial Plan required a plant east of Milan, the waste-to-energy plant was mentioned in two orders of the former ministerial commissioner for waste emergency in the province of Milan in 1995 and 1996. Since a prompt intervention was needed, this project was carried out departing from the procedure of environmental impact assessment (EIA). On June 12th, 1997, the Municipality, TTR and Prima srl companies signed an agreement to build and run the plant. The construction works began in 1999 and finished in 2002, when trials started. In September 2003, the running started at full capacity. On August 9th, 2007, the Region released the Integrated Pollution Prevention and Control (IPPC) at the request of Prima srl for technical changes, improvements and to increase the disposal capacity.

2. Report by Milano 2 Local Health Authority

How is the population of the municipalities neighbouring the waste-to-energy plant of Trezzo sull’Adda?

A study conducted by the Local Health Authorities of Milano 2, Bergamo and Monza e Brianza, in collaboration with the municipalities of Trezzo district (including Trezzo, Basiano, Grezzago, Masate, Pozzo d'Adda, Trezzano Rosa, Vaprio d'Adda), tried to answer this question.

The data resulting from this analysis are reassuring and do not show alarming phenomena.

This research comes after eleven years of plant’s activity and certainly provide a basis for further control surveys, already planned by the Local Health Authorities and by the involved municipalities.

The structure of the research

The analysis was developed by studying the following data relating to 2012 and 2013 and to each municipality:

  • the prevalence of major chronic diseases;
  • the use of anti-asthmatic drugs;
  • hospitalization (both the number of hospitalizations and the number of people hospitalized);
  • death rate.

In addition, the health status of the municipalities involved in the research was compared with that of neighboring municipalities and other  municipalities in the district, to find any excesses of some phenomena.

The research plan included the identification of:

  • an area (1) represented by the municipalities of Trezzo (ASLMI2) and Capriate (ASLBG), with 19,810 inhabitants;
  • an area (2) represented by the municipality of Brembate (ASLBG), with 8,439 inhabitants;
  • an area (3) represented by the municipalities of Cornate (ASLMB), Busnago (ASLMB), Roncello (ASLMB), Grezzago (ASLMI2), Osio Sotto (ASLBG) and Boltiere (ASLBG), with 42,140 inhabitants.

The areas were defined on the basis of the maps of fallout of some substances in the air and on the basis of municipal boundaries.

The municipalities neighbouring these three areas were studied as a control (total: 41,659 inhabitants). In order to check an area as wide as possible, the other municipalities belonging to the three Local Health Authorities were studied in a further control survey (total: 2,440,580 inhabitants).

Health status of the population

Prevalence of chronic diseases

There is an excess of  cardiovascular and chronic gastric diseases  (hepatitis and chronic inflammatory diseases, such as ulcerative colitis and Crohn's disease) for both women and men. In areas 1 and 2 there is also an excess of diabetes.

These diseases are mainly attributable to lifestyle rather than environmental factors.

Use of anti-asthmatic drugs

A research was carried out on the use of anti-asthmatic drugs among the general population. The use of these drugs is comparable to that of the total population of the three local health authorities, even if there are some excesses in areas 1, 2 and 3. These excesses should be studied further to identify possible associations with environmental factors.


The analysis that compares the area of interest with the control areas shows an excess of hospitalizations for psychiatric illnesses  among men, while among hospitalized people there isn’t any significant excess. By aggregating area 1 and area 2, the analysis shows an excess of ordinary hospitalizations among men and women, an excess of psychiatric diseases and of musculoskeletal diseases among men. Instead, the analysis on in-patients does not show significant excesses.

These phenomena are not connected with environmental factors and, rather than a rise in diseases, they reflect a greater tendency to be admitted to hospitals by the same persons.

Death rate

There are no excesses in death rate, both by considering only area 1 and by aggregating it with area 2.

3. Environmental study on the waste-to-energy plant of Trezzo by the University of Parma

All information here: www.dsa.unipr.it/trezzo