Download (pdf - 1.5MB) - Krüger A/S
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Reuse of treated wastewater The tertiary treatment of the wastewater on the Baix Llobregat plant is performed by means of the state-of-the-art process ACTIDisc® ACTIDisc® is a unique technology for reuse of treated wastewater as the water quality obtained at any given time complies with the current standards. At the same time it is a very compact technology which is able to treat large amounts of water on a relatively small area. The ACTIDisc® is a state-of-the-art process developed by Veolia for tertiary treatment of wastewater. The first phase consists of settling by sand which is performed by means of the Actiflo process. The second phase consists of tertiary filtration by disc filters which is performed by means of Hydrotech disc filters. The settling with ballasted sand is performed in three Actiflo lines and the filtration is performed in 10 Hydrotech disc filters with a mesh width of 10 µm. The Baix Llobregat wastewater treatment plant has an average treatment capacity of 302,400 m³/day, and is thus one of the world’s largest recovery plants. ACTIDisc® process Reuse of treated wastewater from Baix Llobregat wastewater treatment plant. Treatment capacity: 302,400 m³/day. Biologically treated wastewater For UV treatment ACTIFLO process Settling by means of ballasted sand Maximum treatment capacity: 3 x 4,800 m³/t Settling capacity: 120 m/t Tertiary filtration Hydrotech Maximum treatment capacity: 10x1,440 m³/t Mesh width: 10 µm. 4
ACTIDisc® Actiflo – settling by means of sand The phase of settling by means of sand is performed in three Actiflo lines, each line having a treatment capacity of 4,800 m³/t and a settling rate of 120 m/t. In the flocculation phase, microsand particles are added to aid the formation of flocs with a high density which increase the settling rate by up to 60 times compared with conventional processes. The process also comprises a unit of hydrocyclones which makes it possible to recover the microsand and thus reuse it in the process. Untreated wastewater Treated wastewater Actiflo comprises four phases: Coagulation Flocculation Maturation Lamella separation Recycled microsand Hydrocyclone Sludge To sludge treatment Raw water inlet Treated water Coagulation Maturation Microsand injection Ballasted flocs to hydrocyclone Hydrotech – tertiary filtration After the settling phase, the water is led to 10 Hydrotech disc filters with a mesh width of 10 µm which polish the recovered water. Each disc filter has a capacity of 1,440 m³/t. Hydrotech is a state-of-the-art filtration system with disc filters which is very efficient and easily adjusted. The Hydrotech system provides a very advanced filtration and is a compact design which makes it very suitable for polishing of water on plants with limited space available. 5
- Page 1 and 2: Reuse of wastewater Baix Llobregat
- Page 3: Baix Llobregat wastewater treatment
- Page 7 and 8: General data Commissioning June 200
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 />
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