33
MYTILINEOS HOLDINGS - SUSTAINABILITY REPORT
2016
Category
Quantity
m
3
/year
Destination
Quantity of water discharges,
including treatment method
Metallurgy &
Mining Sector
From the cooling
process of the
Combined Heat and
Power (CHP) plant
123,044,607
Discharge to the
sea (determined
by legislation)
pH: 8-8,2
Temperature: 22,3
ο
C
Wastewater, including
rainwater, measured
at the point of exit from
the primary treatment
facilities
539,220
Discharge to the
sea (determined
by legislation)
Primary treatment (Settlement of floating particles,
filtration of supernatant fluid, chlorination, discharge).
pH 25οC with temperature compensation: 7,87
Biochemical Oxygen Demand (BOD5) - mg/l: 2,6
Chemical Oxygen Demand (COD)-mg/l: <7
Total Solids (103 – 105
o
C)-mg/l: 681,67
Total Suspended Solids (103 –105
o
C)- mg/l: <25
Sulphides - mg/l: <0,05
Wastewater from the
mining process
22,159
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.
Water used for road
wetting, watering
- Environment
Rehabilitation
23,620
Subsoil
There is no special treatment. It concerns water from
licensed drilling.
Wastewater from
mining site workshops
3,500
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
Industrial service
water in the electricity
production processς.
51,505
43.3%: Disposal to
a MotorOil liquid
waste treatment
plant
56.7%: Disposal by
closed pipeline to
the liquid waste
treatment plant of
ALUMINIUM OF
GREECE
The 22,298 m
3
of service water intended for disposal to
MotorOil undergo treatment for ph regulation (must be
between 6.5 and 9), as well as temperature regulation
(must be <65
o
C).
EPC Projects
Sector
Water from Hydraulic
Tests in Construction
Sites
328
Rainwater
collection network
& disposal for
watering needs.
There is no special treatment. It concerns water from
the public network.
Management of liquid waste and water discharges of the Group΄s activity sectors
32
Additionally, in the Metallurgy & Mining sector, three Biological
Treatment Facilities are in operation to cover the needs of the
ALUMINIUM of GREECE plant and the local communities: The
Biological Treatment Facility in Aspra Spitia & Antikyra, the
Biological Treatment Facility in Agios Nikolaos, with a capacity
of 200 residents, serving the homonymous settlement, and
the Plant’s Biological Treatment Facility with a capacity of 2,000
people, serving the plant’s population.
The Biological Treatment Facility in Aspra Spitia & Antikyra
was the first biological treatment facility for urban waste water in
Greece and was built together with the settlement, by the company
Degrémont France. Following its upgrade in 1995, the facility has
a capacity of 10,000 people. In accordance with the Decision of the
Environmental Terms Approval, monthly analyses are carried
out by the scientific quality control laboratory, which has been
accredited by the Hellenic Accreditation System, in line with the
ELOT EN ISO 17025 standard. During the bathing season (May
- September), samples of water sea are taken from 8 locations
in the Antikyra Gulf. These locations include the sea point exit of
the treated water pipe from the Biological Treatment Station of
Aspra Spitia & Antikyra. The results related to this location have
demonstrated that: a) the legally required limits for exceptional-
quality coastal water are respected b) there is no pathogenic
micro-organisms.
