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MYTILINEOS GROUP
SUSTAINABILITY REPORT 2011
76
Calculation methods
Α. Dust:
Dust concentration in the plant’s point emission sources is measured as follows: a) by isokinetic sampling, with a frequency of four samplings per year at the
plant’s Α070, FLN, H15, H1, H28 chimneys; (b) using continuous measurement analysers at the anodes kiln, revolving and static components and lime kiln
furnaces; and (c) by isokinetic sampling, with monthly samplings at the no. 1-2 and no. 3-4 Gas Treatment Centres for the electrolysis gases. For calculating the
quantities of annual emissions in tons, the following were used: (a) for point sources where isokinetic sampling is used, the average of the four concentration
values (in mg/Nm
3
) and of the flow rate (in Nm
3
/s); and (b) for point sources where continuous measurement is used, the average of the daily concentration
values (in mg/Nm
3
) and of the flow rate (in Nm
3
/s) from the isokinetic samplings of all years for which these are available.
Β. ΝΟx:
Annual nitrogen oxide emissions of nitrogen oxides refer only to fuel consumption (fuel oil) and were calculated stoichiometrically, using an emission factor of
5.363 g/kg of fuel (Guide to Energy Investments, Ministry of Development, 2005). NOx emissions from processes are not measured or calculated (no official
method is available yet).
C. SO
2
:
Annual sulphur dioxide emissions refer only to fuel consumption (fuel oil) and are calculated based on its sulphur content as this is shown on the chemical
analysis sheets. Sulphur dioxide emissions from the anodes baking process are not calculated (no verifiable method is available).
Waste disposal
The management of solid waste is one of the major environmental issues for the Company, as it is committed to “the control and, within our technological
and financial capabilities, the continuous reduction of solid and liquid waste and waste gas, and the improvement of the management of residues through the
promotion of recycling or utilisation processes.”
Waste quantities from the Company’s activities
2010
2011
Hazardous waste (TON)
14,828.0
19,733.2
Non-hazardous waste (TON)
893,680.1
981,690.5
Waste quantities by disposal method
2010
2011
Recycling (TON)
203.8
2,618.11
Reuse / Utilisation (raw material in ceramic industry, cement production, infrastructures etc.)
37,689.9
88.430,3
Used oil re-refining or other reuses of previously used oil
81.7
Waste exchange for treatment using one of the processes stated in items R1 to R11 –
Joint Ministerial Decision (ΚΥΑ) 13588/2006 (R12)
23.4
Disposal at sea (ΤΟΝ)
201,203.0
212,061.0
Collection by third parties (Destruction) (ΤΟΝ)
461.3
352.0
Storage & oil separation (in third-party facilities) (ΤΟΝ)
349.0
Disposal in landfill for Non-Hazardous Waste (ΤON)
654,122.1
681.077,9
Disposal in landfill for Hazardous Waste (TON)
14,828.0
16.430,3
With regard to hazardous waste: The increase from 2010 in the quantity of the waste from the electrolysis process, is due to the fact that electrolysis line B,
which was inactive during 2010, resumed its operation in 2011. Hazardous waste from the alumina process is due to the quality of the bauxite consumed
(lower quality of available bauxites). With regard to non-hazardous waste: All non-productive decalcification stock (79,000 tons) was made available for the
construction of infrastructures.
