The management of water resources

The management of water resources is an environmental issue which the SEA Group has for some time dedicated focus and its consolidated knowledge, following an undertaking to become entirely self-sufficient in the provision of water, through the construction of a series of independently managed wells which fulfil the hygiene/sanitary, fire control and “industrial” needs of both airports. 

Water sources

The principal water sources utilised are the aquifers, to which the 12 wells located at Malpensa and the 8 wells located at Linate are linked.

For Malpensa, the aquifer has a depth of approx. 51 metres (water table measures carried out on the G and L wells), while for Linate the aquafer has a depth of approx. 5 metres. The water drawn from wells at the airport sites of Malpensa and Linate are distributed for consumption through internal aqueducts. 

The chemical/physical and quantitative control, in addition to the consumption rationalisation activities, ensure the highest level of attention to this important common resource.

Water sources (m3)

Water sources

Note: The consumption figures include SEA Energia
Source: SEA

The total water need was effected by lower water needs for "climate control" following the progressive development of the technological unit at Linate and lower construction needs at Malpensa airport.

Water quality

The quality of the water distributed through the airport aqueducts was subject, in addition to inspections by the Sanitary Board, an internal programme of frequent checks which includes the evaluation of the numerous chemical/physical and microbiological parameters.

The following tables outline that the parameters analysed are significantly lower than the maximum levels permitted by law and highlight the good quality of the water distributed at both airports.

LINATE – CHARACTERISATION OF THE POTABLE WATER

Parameter   Average annual valueParameter values
Legislative Decree 31/01
 Measurement unit201420132012 
pH pH unit 7.8 7.7 7.8 6.5 ≤ pH ≤ 9.5
Conductivity µS/cm 400.7 404.6 418.5 2500
Hardness °f 22.5 22.9 21.1 15 ≤ °f≤ 50
Nitrates mg/l 10.8 10.8 12.5 50
Chlorides mg/l 6.9 6.9 8.4 250
Sulphates ug/l 31.8 31.5 32.1 250
Iron ug/l 13.2 11.8 10.3 200
Sodium mg/l 5.8 6.3 7.5 200
Trichloroethylene + Tetrachloroethylene µg/l 1.4 1.1 1.3 10
Total trihalometanes µg/l 1.1 0.9 0.9 30
Benzine µg/l 0.1 0.1 0.0 1
Coliform bacteria at 37°C n/100ml 0.0 0.0 0.0 0
Escherichia coli n/100ml 0.0 0.0 0.0 0
Enterococcus n/100ml 0.0 0.0 0.0 0

Source: SEA

MALPENSA – CHARACTERISATION OF THE POTABLE WATER

Parameter Average annual valueParameter values
Legislative Decree 31/01
 Measurement unit201420132012 
pH pH unit 8.0 7.9 8.0 6.5 ≤ pH ≤ 9.5
Conductivity µS/cm 344.7 342.5 350.9 2500
Hardness °f 18.3 17.9 16.1 15 ≤ °f≤ 50
Nitrates mg/l 21.9 23.3 22.7 50
Chlorides mg/l 10.8 10.6 11.9 250
Sulphates ug/l 16.2 16.0 16.8 250
Iron ug/l 14.9 15.0 11.5 200
Sodium mg/l 7.6 8.0 8.7 200
Trichloroethylene + Tetrachloroethylene µg/l 1.5 1.9 2.0 10
Total trihalometanes µg/l 1.1 1.1 0.8 30
Benzine µg/l 0.1 0.1 0.1 1
Coliform bacteria at 37°C n/100ml 0.0 0.0 0.0 0
Escherichia coli n/100ml 0.0 0.0 0.0 0
Enterococcus n/100ml 0.0 0.0 0.0 0

Source: SEA

Discharge

The management of water discharge is principally related to the civil sewage filtering and collection systems (or related systems) from the airport infrastructure and from the meteorological wash away of impermeable areas. 

The collection and separation of domestic sewage from all buildings present at the airport is assured at Malpensa by the sewage network which delivers sewage to the San Antonio consortium filter system, while the Linate sewage network is linked to the Peschiera Borromeo filter system. 

The discharged sewage water (black water and first flush treated water) is subject to systematic quality controls. 

At both airports, the quality of sewage falls within the limits established by the applicable sector environmental regulation, as highlighted below in the tables, which report the parameters monitored.

LINATE – CHARACTERISATION OF SEWAGE DISCHARGE

Parameter Average annual valueParameter values
Legislative Decree 152/06
 Measurement unit201420132012 
COD mg/l 86.0 151.4 148.0 500
BOD5 mg/l 27.0 52.5 63.8 250
Total phosphorous mg/l 1.0 2.7 2.2 10

Source: SEA

MALPENSA – CHARACTERISATION OF SEWAGE DISCHARGE

Parameter Average annual valueParameter values
Legislative Decree 152/06
 Measurement unit 201420132012 
COD mg/l 254.4 246.7 234.0 500
BOD5 mg/l 73.1 86.4 89.7 250
Total phosphorous mg/l 3.3 3.8 1.5 10

Source: SEA

Water discharged is estimated as equal to the amounts sourced. The following table reports the waste water discharged through sewerage, with the remaining quantities dispersed.

Water sewage discharge (m3)

201420132012
Malpensa 1,054,974 874,439 925,285
Linate 631,046 731,586 791,201

Note: The Linate data does not include the values concerning the discharges of SEA Energia. In relation to Linate, the discharges are estimated as equal to the civil water sourced.  

Source: SEA

De-icing treatment, relating to the defrosting of aircraft during the winter and when required by the airlines, is carried out at a dedicated apron, equipped with a system for the collection of any water discharge and is treated as special waste.

De-icing liquid drained (tonnes)

 201420132012
Malpensa 15 44 21
Linate 45 68 104

Source: SEA

The management of meteorological water

Meteorological water from the airports is collected in surface water vessels (Linate) and in the undersoil area (Malpensa), before, for the areas covered by the regional regulations, the separation of the first flush water (treated with oil removal systems and collected in public drainage collectors).

Before the final collection of meteorological water, periodic quality checks are carried out on the CrVI, Cu, Pb, Zn and hydrocarbon parameters (collected in ground water vessels) and COD, BOD5, Suspended Solids, P, Pb, CrVI, Cu, Zn, Surfactants and Hydrocarbons (collected in the soil).

The maintenance of the substantial absence or low proportion of metals in all types of discharge is reported, along with the low level of hydrocarbons of 0.5mg/l.

LINATE – CHARACTERISTICS OF THE SURFACE WATER DISCHARGE

ParameterMeasurement unitAverage annual value Parameter values
Legislative Decree 152/06
  201420132012 
Chromium VI mg/l 0.005 0.0 0.0 0.2
Copper mg/l 0.006 0.0 0.0 0.1
Lead mg/l 0.005 0.0 0.0 0.2
Zinc mg/l 0.05 0.2 0.2 0.5
Total hydrocarbons mg/l 0.2 0.5 0.1 5.0

Source: SEA

MALPENSA – CHARACTERISATION OF SOIL DISCHARGE

ParameterMeasurement unitAverage annual valueParameter values
Legislative Decree 152/06
  201420132012 
Ph mg/l 7.3 7.4 7.5 8.0
COD mg/l 10 16.3 24.7 100.0
BOD5 mg/l 10 6.8 9.0 20.0
Total suspended solids mg/l 5 6.5 7.2 25.0
Total phosphorous mg/l 0.1 0.5 0.5 2.0
Lead mg/l 0.01 0.0 0.0 0.1
Chromium VI mg/l 0.01 0.0 0.0 0.2
Copper  mg/l 0.01 0.0 0.0 0.1
Total hydrocarbons mg/l 0.1 0.5 0.5 5
Zinc mg/l 0.01 0.0 0.0 0.5
Total surfactants mg/l 0.2 0.3 0.2 0.5

Source: SEA

Currently, water re-usage systems are not in place at the airports. The SEA Group, together with other major European operators, is exploring many aspects related to Water Saving systems and the possible re-usage of meteorological water, in order to save aquifer drawn water and rationalise water consumption.

Spillages

SEA is committed to closely considering and ensuring the correct management of potential spillages. In the case of the accidental spillage of fuel or oil in operational areas, runways and stands, procedures are in placed to intercept fluids before they reach the meteorological water drainage systems. A specific procedure applicable to the terminal movement areas is in place at the airports in compliance with environmental protection regulations. In these conditions, the Airport Maintenance and Environmental Operations Management Units are deployed to co-ordinate the cleaning, reclamation and restoration actions in the affected areas, of the compliance and security conditions, after any containment by the Fire Services.

The Fire Service actions consist of:

  • fire prevention assistance until the recovery of normal conditions within the area impacted by the spillage;
  • the containment, where considered necessary by the Chief of the Fire Brigade, of the area affected by the spillage through the laying of a sufficient number of oil absorbent panels.

The waste generated by the cleaning operation is transported for each airport to specific airport ecological islands, as established by company procedures, in compliance with the environmental protection, safety and workplace hygiene rules applied at both the Milan airports.

The spillages taken into consideration were those considered significant, in particular those which involved areas equal to or greater than 20 m2.

Major spillages (No.)

Major spillages - Malpensa

(*) Spillages of hydraulic oil from aircraft, of hydraulic oil from operating vehicles and spillages of gasoline from operating vehicles
Source: SEA

Major spillages (No.)

Major spillages - Linate

(*) Spillages of hydraulic oil from aircraft, of hydraulic oil from operating vehicles and spillages of gasoline from operating vehicles
Source: SEA

Spillages of hydraulic oil related to the breakage of operational equipment. The issue is closely related to the characteristics of the equipment and the terminal Maintenance Department have introduced specific plans to deal with such events.