Environmental management and carbon footprint reduction

• "Carbon Trust Standard" for carbon management
• Participant in the Carbon Reduction Commitment
• Special biodiversity sites in optimal ecological condition
• Winner of the national award for endangered species

Leisure and fishing

• World-class fly fishing in Chew Valley and Blagdon Lakes 
• 400,000 visits a year to Bristol Water leisure sites
• Heritage visitor centre with a historical steam engine 
• Natura 2000 designated site for bird watching
  

In 1998 Agbar provided the infrastructures necessary to use non-drinking groundwater by building a well which extracts water from the marginal aquifer.

The water is used for:

• Watering the park
• Cleaning by loading tankers

20 wells in operation in Cornellà (Barcelona, Spain)

Actions aimed at preserving the aquifer:

• Protection of the quality and availability of ground water resources
  • On the surface: scarifying the bed of the River Llobregat using a tractor
  • At depth: infiltration of surplus water from the Sant Joan Despí drinking water treatment plant
• 1.93 hm³ recharged at depth and on the surface
• 40 years’ experience recharging the River Llobregat aquifer

Population supplied: over 6 million inhabitants
Sources of supply of Aguas Andinas:

• 87% from surface and 13% ground sources.
• El Yeso Reservoir 250 Hm³.
• Laguna Negra 600 Hm³.
• Laguna Lo Encañado 50 Hm³.
• La Dehesa Reservoir 1.2 Hm³.

• Operated by AGBAR since 1999
• Complex formed by 3 treatment plants 
• Maximum capacity: 1.38 hm³/day
• Water treated: 380.1 hm³/year
• Energy consumption 2.47 Gwh /year >> 0.0065 kwh/m³
• Sources: Surface River Maipo 100%

Technologies

• Conventional Water Line
• Coagulation / Flocculation / Sedimentation
• Sand and activated and non-activated carbon filtration
• Final disinfection: Chlorine
• Sludge line: Thickening / Centrifuging

• €181M investment. Surface area: 51,000m²
• Drinking water treatment 60 hm³/year (28% of Barcelona’s needs in 2008)
• Pressure exchangers: 50% saving in energy consumption.
• 16,800 reverse osmosis membranes. Pressure 70 bars on intake
• Construction and improvement years: 2009 (Investment: €220M)
• Operated by AGBAR since July-2009
• Maximum capacity: 200,000 m³/day (60 hm³/year)
• Energy consumption 180 Gwh /year >> 3 kwh/m³
• Sources: Seawater >> 45% reverse osmosis water
  

References

• Catchment 2,200m from the coast at a depth of 31m
• Pump suction capacity: 4,170 m³/h
• Energy: 17% saving in energy consumed using 23
• Pressure exchangers (ERI)
• Sand filtration pre-treatment
• Reverse Osmosis: pressure 71 kg/cm², 16,100 membranes
• Post-treatment

20 wells in operation in Cornellà (Barcelona, Spain)

Actions aimed at preserving the aquifer:

• Protection of the quality and availability of ground water resources
  • On the surface: scarifying the bed of the River Llobregat using a tractor
  • At depth: infiltration of surplus water from the Sant Joan Despí drinking water treatment plant
• 1.93 hm³ recharged at depth and on the surface
• 40 years’ experience recharging the River Llobregat aquifer

Integrated management: reservoir, mountain aqueducts, production,Transport and distribution

230 remote control stations and over 5,000 sensors monitoring the drinking water treatment, transport and distribution

Technologies

• Continuous and real time monitoring of volumes and pressures together with condition of pumping, tank levels and operational condition of the drinking water treatment plants.
• Remote control and operation of valves, pumping (140 wells and network) and drinking water treatment plants
• Application of emergency strategies.
• GIS, Mathematical models, Network renewal programmes

• Operated by AGBAR since 1999
• Network length: 10,225 km
• Almost exclusively gravitational network due to the conditions of the terrain
• 22 wastewater sub-basin measurement points

Technologies

• Large intercepting sewers to protect natural riverbeds: Rivers Maipo and Mapocho, Zanjón de la Aguada
• Separate sewerage system. Plan of interconnections and joint management with rainwater network (managed by the Ministry of Public Works)
• Network managed with GIS, Remote Control and Mathematical Models
• Volume monitoring points
• 23 pumping stations with generating set for power cuts
• On-line management of unblocking works. Scheduler + PDA

BARCELONA. METROFANG

• Capacity: 4 lines x 4,000 l/h (30% of the sludge of Catalonia)
• Project range: > 10 million euros

ALICANTE. CEMEX

Waste energy recovery from the cement factory to dry the sludge

• Capacity: 2 lines x 3,000 l/h
• Project range: 2-5 million euros

BOURDEAUX. LOUIS FARGUE

Heat pump and biogas use for drying process

• Capacity: 1 lines x 1,500 l/h
• Project range: < 2 million euros

• Operated by AGBAR since 2004
• Maximum capacity: 760,320 m³/day
• Water Treated: 217.7 hm³/year (2009)
• Energy consumption 56.1 Gwh /year >> 0.26 kwh/m³

Technologies

• Conventional Water Line: (16 treatment lines)
• Primary and Secondary Sedimentation
• High load aeration. Piston carousel flow type biological reactors
• Advanced Treatments water line
• Disinfection using chlorine gas
• Sludge Line: Concentration of primary sludge through gravity and biological sludge through flotation
• Anaerobic digestion at 35 ºC, 8 digesters (15,000 m3/u.), sludge retention time of 20 days
• Production and management of 139,337 t/year of dehydrated sludge
  

 (Sitges, Barcelona. Spain)

The control system offers a new sign of quality for the town’s beaches which, in turn, allows the main sources of pollution to be identified. If there is pollution, or a risk of pollution, the system will define the nature, frequency and possible duration of the episode.

The project includes a warning system using sensors which will allow a bathing water quality forecast to be made, and also allow the citizens to be informed about the state of the water in real time and on the Internet.