The two most important environmental parameters qualifying energy production from renewable sources are the amount of CO2 avoided and the Primary Energy Savings (PES). In the table below the values of the parameters have been estimated for a single gasification module (based on 7.000 hours of operation per year) under the hypothesis of exploiting all the power and heat available:
| |
Cogeneration from RES |
|
| |
CO2 avoided |
ca 2.500 ton/y |
| |
Primary energy saving |
ca 1.100 tep/y |
The concentration values of gaseous pollutants and particulate are largely kept within the limits established by Legislative Decree no. 152, 3 April 2006. For systems with installed capacity ranging from 0.15 MW and 3 MW and fed with solid fuels, the emission limits are set as follows (with 11% oxygen content in effluent gases):
| |
Emissions |
|
| |
Dust |
100 mg/Nm3 |
| |
Carbon Monoxide (CO) |
350 mg/Nm3 |
| |
Nitrogen oxides (as NO2) |
500 mg/Nm3 |
| |
Sulfur Oxides (as S02) |
200 mg/Nm3 |
The plant consumes a small amount of water necessary for the operation of the cooling tower. No process residues are produced, with the exception of mineral ashes originally contained in the biomass fed to the plant. The system does not generate significant noise emissions, which are largely kept within the limits prescribed by law.
| |
Other |
|
| |
Water consumption |
600-700 m3/y |
| |
Biomass ashes |
40-50 ton/y |
| |
Noise emissions |
within the limits prescribed by law |
|
