Continuous measurements are carried out with dedicated instruments that take a sample of the fumes originating from the combustion of waste, downstream of the waste purification treatment, 24/7 without interruption on each line of the plant, and return the concentration results in real time.
TRM performs this type of measurements, as established by Legislative Decree 152/06, for the following parameters:
- Total Dusts
- Organic substances in the form of gases and vapours expressed as total organic carbon – TOC
- Hydrochloric acid – HCl
- Hydrofluoric acid – HF
- Sulphur dioxide – SO2
- Nitrogen monoxide and nitrogen dioxide expressed as nitrogen dioxide – NO2
- Ammonia – NH3
- Carbon monoxide – CO
Periodic measurements, on the other hand, are carried out using dedicated instruments and the support of a specialised laboratory: periodic monitoring involves a sampling phase of variable duration depending on the parameter being checked and a subsequent laboratory analysis phase. The frequency of these self-checks is as established by law.
The parameters subject to periodic measurements are:
- Cadmium and Thallium – Cd + Tl
- Mercury – Hg
- Zinc – Zn
- Sum of metals (Antimony – Sb + Arsenic – As + Lead – Pb + Chromium – Cr + Cobalt -Co + Copper – Cu + Manganese – Mn + Nickel – Ni + Vanadium – V + Tin – Sn)
- Organic micro-pollutants
- Dioxins and furans – PCDD + PCDF
- Polycyclic Aromatic Hydrocarbons – PAH
- Polychlorinated Biphenyls Dioxin Like – PCB-DL
The PCB-DL measurement is performed as of 1 January 2016, following regulatory amendments to Legislative Decree. 46/14.
AIA establishes, in addition to the fiscal measurements, a series of measurements with the goal of achieving better understanding of the process and stronger control of related environmental effects.
The parameters subject to this “additional” monitoring are mercury and some families of organic micropollutant both of which are already subject to periodic fiscal monitoring but for which more data were deemed necessary.
To said end, then:
- There is a continuous measurement of mercury for each line.
- There is a continuous sampling system for PCDD/PCDF and PAH that provides 28-day samples then analysed in the laboratory. In fact, due to the type of element it is not possible to obtain a real time measurement; however, continuous sampling provides information on the total emission of the plant (not limited, that is, to the 3 annual fiscal sampling sessions of 8 hours each).