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Reuse of wastewater<br />
Baix Llobregat wastewater treatment plant<br />
in Barcelona, Spain
Barcelona<br />
Approx. 4 million people live in and around Barcelona and<br />
also the majority of the Catalonian industry is located in<br />
this area.<br />
The water supply to the town comes from groundwater<br />
as well as treated water from the river of Llobregat that is<br />
relatively saline.<br />
Clear water<br />
is a limited, however,<br />
vital ressource in the<br />
Mediterranean area.<br />
Barcelona has taken the<br />
consequences and now<br />
reuses the treated<br />
wastewater.<br />
The aquatic<br />
environment<br />
in Catalonia<br />
To reduce the use of the limited<br />
water resources the Spanish Ministry<br />
of the Environment has decided<br />
to treat and reuse a part of the<br />
town’s wastewater.<br />
The treated wastewater is applied for irrigation of the<br />
farm land around the river as well as some of the golf<br />
courses in the area<br />
Furthermore, a part of the treated wastewater is<br />
returned to the river to maintain the water level and<br />
ensure an increased flow<br />
At the same time, a part of the treated wastewater is<br />
led to a reverse osmosis plant for further treatment<br />
and the water is pumped to the underground to<br />
avoid salt water from the sea to seep into the groundwater<br />
resources.<br />
2
Baix Llobregat<br />
wastewater<br />
treatment plant<br />
The plant is a activated sludge<br />
plant and one of Europe’s larger<br />
plants treating the wastewater<br />
for approx. 2 million people and<br />
having a capacity of 420,000 m³<br />
wastewater/day.<br />
The biological part of the treatment removes approx. 92%<br />
of the suspended solids and the dissolved contamination<br />
after which three-quarters are led to a tertiary treatment<br />
and then reused.<br />
The Baix Llobregat wastewater treatment plant is<br />
operated by Depuradora del Baix Llobregat SA which is<br />
a public company owned by the Spanish Ministry of the<br />
Environment.<br />
In comparison the<br />
two plants in Copenhagen,<br />
Lynetten and Damhusåen<br />
operated jointly by Lynettefællesskabet,<br />
treat wastewater corresponding<br />
to 1.1 million people and<br />
with a capacity of 220,000 m³<br />
wastewater/day<br />
Reuse of the wastewater<br />
In cooperation with its Spanish sister company, Krüger<br />
has designed and constructed the tertiary treatment<br />
plant in Baix Llobregat.<br />
The plant consists of 3 compact and very efficient Actiflo<br />
plants and 10 Hydrotech disc filters for polishing of the<br />
water. The total capacity is 302,400 m³ treated wastewater/day.<br />
80%<br />
The combination of Actiflo and the disc<br />
filters provides a very robust and very<br />
compact plant able to deal with very heavy<br />
hydraulic loads and substances. This<br />
combination ensures an 80%-reduction<br />
of the area required compared to other<br />
solutions of similar capacity and load.<br />
3
Reuse of treated<br />
wastewater<br />
The tertiary treatment of<br />
the wastewater on the Baix<br />
Llobregat plant is performed by<br />
means of the state-of-the-art<br />
process ACTIDisc®<br />
ACTIDisc® is a unique technology for reuse of treated<br />
wastewater as the water quality obtained at any given<br />
time complies with the current standards. At the same<br />
time it is a very compact technology which is able to treat<br />
large amounts of water on a relatively small area.<br />
The ACTIDisc® is a state-of-the-art process developed by<br />
Veolia for tertiary treatment of wastewater. The first phase<br />
consists of settling by sand which is performed by means<br />
of the Actiflo process. The second phase consists of<br />
tertiary filtration by disc filters which is performed by<br />
means of Hydrotech disc filters. The settling with ballasted<br />
sand is performed in three Actiflo lines and the filtration<br />
is performed in 10 Hydrotech disc filters with a mesh<br />
width of 10 µm.<br />
The Baix Llobregat<br />
wastewater treatment<br />
plant has an average<br />
treatment capacity of<br />
302,400 m³/day, and is<br />
thus one of the world’s<br />
largest recovery plants.<br />
ACTIDisc® process<br />
Reuse of treated wastewater from Baix Llobregat<br />
wastewater treatment plant.<br />
Treatment capacity: 302,400 m³/day.<br />
Biologically<br />
treated<br />
wastewater<br />
For UV<br />
treatment<br />
ACTIFLO process<br />
Settling by means of ballasted sand<br />
Maximum treatment capacity: 3 x 4,800 m³/t<br />
Settling capacity: 120 m/t<br />
Tertiary filtration Hydrotech<br />
Maximum treatment capacity: 10x1,440 m³/t<br />
Mesh width: 10 µm.<br />
4
ACTIDisc®<br />
Actiflo – settling by means of sand<br />
The phase of settling by means of sand is performed in three<br />
Actiflo lines, each line having a treatment capacity of 4,800<br />
m³/t and a settling rate of 120 m/t.<br />
In the flocculation phase, microsand particles are added to aid<br />
the formation of flocs with a high density which increase the<br />
settling rate by up to 60 times compared with conventional<br />
processes. The process also comprises a unit of hydrocyclones<br />
which makes it possible to recover the microsand and thus<br />
reuse it in the process.<br />
Untreated wastewater<br />
Treated wastewater<br />
Actiflo<br />
comprises four phases:<br />
Coagulation<br />
Flocculation<br />
Maturation<br />
Lamella separation<br />
Recycled<br />
microsand<br />
Hydrocyclone<br />
Sludge<br />
To sludge treatment<br />
Raw water inlet<br />
Treated<br />
water<br />
Coagulation<br />
Maturation<br />
Microsand<br />
injection<br />
Ballasted flocs<br />
to hydrocyclone<br />
Hydrotech – tertiary filtration<br />
After the settling phase, the water is led to 10 Hydrotech disc<br />
filters with a mesh width of 10 µm which polish the recovered<br />
water. Each disc filter has a capacity of 1,440 m³/t.<br />
Hydrotech is a state-of-the-art filtration system with disc filters<br />
which is very efficient and easily adjusted. The Hydrotech<br />
system provides a very advanced filtration and is a compact<br />
design which makes it very suitable for polishing of water on<br />
plants with limited space available.<br />
5
The advantages of the ACTIDisc® process<br />
The water quality obtained by the ACTIDisc® process<br />
is always better than any other quality obtained in<br />
similar processes. ACTIDisc® guarantees reduced turbidity<br />
and suspended solids and reduces the content<br />
of helminth eggs.<br />
The process is very reliable as the quality of the<br />
treated water is maintained at a response time of<br />
less than 20 minutes independently of the possible<br />
variations in the quality of the inlet water.<br />
A very compact process<br />
The space requirements to the process plant are<br />
minimal. Typically, providing space savings of up to<br />
80% compared to conventional plants.<br />
The process can be introduced on existing plants.<br />
The space saving also reduced the construction costs.<br />
The start-up of the ACTIDisc® process is very rapid<br />
which reduces the costs related to chemicals, energy<br />
and water.<br />
The ACTIDisc® operates by gravitation (without<br />
pumps) providing further energy savings.<br />
6
General data<br />
Commissioning June 2006<br />
Average amount treated<br />
302,400 m³/day<br />
Maximum amount treated 14,400 m³/hour<br />
Actiflo - settling by ballasted sand<br />
Maximum settling capacity 3 x 4,800 m³/hour<br />
Settling rate<br />
120 m³/m² x hour<br />
Hydrotech – tertiary filtration<br />
Maximum treatment capacity 10 x 1,440 m³/hour<br />
Mesh width in filters 10 µm<br />
Design data Water quality requirements Expected values<br />
BOD5 ≤ 20 mg/l ≤ 10 mg/l ≤ 5 mg/l<br />
SS ≤ 50 mg/l ≤ 5 mg/l ≤ 5 mg/l<br />
Turbidity ≤ 50 NTU < 5 NTU < 2 NTU<br />
Helminth eggs < 1 U/1000 ml < 1 U/1000 ml<br />
7
Denmark<br />
Sweden<br />
Finland<br />
Lithuania<br />
Krüger A/S<br />
Gladsaxevej 363<br />
DK-2860 Søborg<br />
Tel: +45 39 69 02 22<br />
kruger@kruger.dk<br />
www.kruger.dk<br />
Haslegårdsvænget 18<br />
DK-8210 Aarhus<br />
Tel: +45 87 46 33 00<br />
aarhus@kruger.dk<br />
Indkildevej 6 C<br />
DK-9210 Aalborg SØ<br />
Tel: +45 98 18 93 00<br />
aalborg@kruger.dk<br />
Krüger Aquacare<br />
Fabriksparken 50<br />
DK-2600 Glostrup<br />
Tel: +45 43 45 16 76<br />
aquacare@kruger.dk<br />
www.aquacare.dk<br />
VA-Ingenjörerna AB<br />
Vretenvägen 13<br />
SE-171 54 Solna<br />
Tel: +46 8 579 781 20<br />
www.vaing.se<br />
AnoxKaldnes<br />
Klosterängsvägen 11A<br />
SE-226 47 Lund<br />
Tel: + 46 46 - 18 21 50<br />
Fax :+ 46 46 - 13 32 01<br />
sweden@anoxkaldnes.com<br />
Hydrotech AB<br />
Mejselgatan 6<br />
SE-235 32 Vellinge<br />
Sweden<br />
Tel. +46 40 42 95 30<br />
mailbox@hydrotech.se<br />
Norway<br />
Krüger Kaldnes<br />
Hegnasletta 11<br />
3217 Sandefjord<br />
Tel:+ 47 91 60 80 00<br />
Faks: +47 33 48 50 01<br />
post@krugerkaldnes.no<br />
Aquaflow Ltd.<br />
Kirkkokatu 7B, P.O. Box 116<br />
FIN-57101 Savonlinna<br />
Tel: +358 (0)207 441 600<br />
info@aquaflow.fi<br />
Ruosilantie 14<br />
FIN-00390 Helsinki<br />
Tel: +358 (0)207 441 642<br />
info@aquaflow.fi<br />
Tullikatu 11<br />
FIN-21100 Naantali<br />
Tel: +358 (0)207 441 646<br />
info@aquaflow.fi<br />
Poland<br />
Veolia Water Solutions &<br />
Technologies Sp. z o.o.<br />
ul. Balicka 48<br />
PL-30-149 Krakow<br />
Tel: +48 12 423 38 66<br />
Fax: +48 12 423 34 82<br />
info.poland@veoliawater.com<br />
ul. Janka Muzykanta 60<br />
02-188 Warszawa<br />
Tel: +48 (022) 205 39 39<br />
Fax: +48 (022) 205 39 38<br />
UAB Krüger<br />
Olimpiečių str. 1<br />
LT-09200 Vilnius<br />
Tel: +370 5 21 22 396<br />
jurate@kruger.lt<br />
Lativa<br />
SIA ”Krüger”<br />
Brivibas str. 180<br />
LV-1012 Riga<br />
Tel./fax: +371 67 292 529<br />
Mobile: +371 26 440 770<br />
marina.castnikova@veoliawater.com<br />
Russia<br />
OOO ECOTEK & Krüger A/S<br />
ul. Dm. Donskogo 7<br />
Kaliningrad, 236000<br />
Tel: +7 (4012) 604 480<br />
ecotek@gazinter.net<br />
May 2010