ΜΕΤΚΑ | SUSTAINABILITY REPORT 2015 - page 36-37

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35
MYTILINEOS HOLDINGS SUSTAINABILITY REPORT
2015
8.6 Water
G4-EN8
The total volume of water withdrawn required for the Group’s ac-
tivities in 2015 stood at 164.8 million m
3
, down by 0.8% from 2014.
This reduction is mainly due to the restriction by 2 million m
3
of the
volume of seawater withdrawn for use in the cooling systems of
the Group’s heavy industry plants. In detail:
Regarding the seawater used in the cooling systems of the Com-
bined Heat and Power (CH) plant of ALUMINIUM OF GREECE, in
addition to the strict compliance with the relevant provisions of
the laws determining the framework for preventing any envi-
ronmental impact, the company commissions, on an annual
basis, an authoritative organisation (Hellenic Centre for Marine
Research - HCMR) to conduct of a research study to monitor the
status of living organisms (benthic biocoenoses, with emphasis
on thermophilic species) on the Antikyra Gulf seabed.
Finally, the quantity of water reused or recycled in the Group’s
activity sectors in 2015 stood at 4.53 million m
3
(corresponding
to 2.7% of the total volume of water withdrawn) . Of this
total quantity, 99.8% concerns water recycled/reused in the En-
ergy Sector. More specifically: (a) The utilisation of 4,508,422 m
3
of seawater, from the cooling systems of the Combined Heat
and Power (CHP) plant of ALUMINIUM OF GREECE, by the Ag.
Nikolaos thermal power plant of Protergia, and (b) the recycling
of 19,539 m
3
of liquid waste from the Heat Recovery Boiler of
KORINTHOS POWER S.A. (a subsidiary of Protergia).
Total water withdrawal from surface waters (sea) (m
3
)
2014
2015
Down 1.3% from 2014.
Volume of seawater used in the cooling systems of the Combined
Heat and Power (CHP) plant of ALUMINIUMOF GREECE. The limit on the volume of seawater
withdrawn annually is determined by the Water Resources Management Directorate of the
Sterea Regional Administration.
161,733,577
159,609,769
Total water withdrawal from groundwater sources (m
3
)
2014
2015
Up 3.2% from 2014.
Volume of industrial service and drinking water used primarily
to meet the manufacturing/processing, energy and water supply needs of the Group’s
industrial facilities. Of total volume, 99.1% is obtained from a network of 17 drills, owned
by ALUMINIUM OF GREECE, which the company operates in the broader region around
its plant, in strict compliance with the provisions of the Water Resources Management
Directorate of the Sterea Regional Administration.
4,997,097
5,159,676
Total water withdrawal from public water supply utilities (m
3
)
2014
2015
Down 41.2% from 2014.
Volume of water from municipal reserves and public water
supply utilities used to meet the needs of the Group's buildings and primarily industrial
facilities, as e.g. happens in ALUMINIUM OF GREECE, which uses the quantity of water
attributable to the Metallurgy & Mining Sector and coming from the Athens Water Supply
and Sewerage Company (EYDAP - Mornos River Connection), exclusively for industrial
service use.
152,555
62,897
Total utilisation of stormwater (m
3
)
2014
2015
Up 16.6% from 2014.
Rainwater collected directly in a special reservoir configured in the
area of a disused mine, used by DELPHI-DISTOMON.
6,000
7,000
Group policy on the responsible management
of water:
G4-EN10
Quantity
m
3
/year
Destination
Quantity of water discharges, including treatment
method
Metallurgy & Mining
Sector
159,609,769
From the cooling process of
the Combined Heat and Power
(CHP) plant
Discharge to
the sea
(determined by
legislation)
pH: 8-8,2
Temperature: 22,3
ο
C
656,280
Wastewater, including
rainwater, measured at the
point of exit from the primary
treatment facilities
Discharge to the
sea (determined by
legislation)
Primary treatment (Settlement of floating particles,
filtration of supernatant fluid, chlorination, discharge)
pH 25
o
C with temperature compensation: 7,96
Chlorides - mg/l: 256,67
Fluorides - mg/l: 1,80
Biochemical Oxygen Demand (BOD5) - mg/l: 3,10
Chemical Oxygen Demand (COD) - mg/l: <7
Total Solids (103-105
o
C) - mg/l: 844,17
Total Suspended Solids (103-105
o
C) - mg/l: <25
Sulphides- mg/l: 0,05
22,159
Wastewater from the mining
process
Subsoil
No particular processing. This waste is water (from
licensed drills or water collected in underground
mining sites) used in the mining process, which
with the addition of inert bauxite or limestone dust
(depending on the particular mining activity), becomes
a liquid mix that ends in the aquifer.
3,500
Wastewater from mining site
workshops
Watering of
rehabilitated areas.
Cleaning of liquid waste from sites using a system of
filters (sand - active carbon). The water obtained by
this process is suitable for irrigation (site landscape
rehabilitation) or reuse in the production process.
Chemical tests show a BOD<5 (with the maximum
limit being 10).
Energy
Sector
52,040
Industrial service water in the
electricity production process
43,6%: Disposal to
a MotorOil liquid
waste treatment
plant
56,3%: Disposal by
closed pipeline to
the liquid waste
treatment plant of
ALUMINIUM OF
GREECE
The amount of the industrial service water intended
for disposal to Motor Oil undergoes treatment for
ph regulation (must be from 6.5 to 9), as well as for
temperature regulation (must be <65
ο
C.).
EPC Projects Sector
300
Water from Hydraulic Tests in
Construction Sites
Rainwater
collection network
& disposal for use
in irrigation.
Treatment in the Project's Biological Treatment
Facilities
52.000
Water from chemical cleaning
in Construction Sites
External licensed
Biological
Treatment
Facilities.
Temporary storage in a site tank for thermal load
balancing
Management of liquid waste and water discharges of the Group's activity sectors
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