Reduction in overflows at the Main and Beach Pumping Stations of the Cunit–Cubelles System
Reduction in overflows at the Main and Beach Pumping Stations of the Cunit–Cubelles System
Improvement to the pumping system to minimise overflows, through the installation of a new rain water pump alongside the current main pump and linking the pumping wells of both stations.
Client:
Cubelles Municipal Council
Location:
Barcelona
Period:
November 2019–March 2020
Type of work:
Hydraulic Infrastructures
Typology:
Treatment plants
Budget:
Contract budget including VAT: €1,181,171.99
Cubelles is located at sea level and has no elevation for the wastewater to reach the WWTP by gravity, so it has a series of pumping stations that transport the wastewater to its WWTP. In addition, the municipal sewage system is largely unified, which means that on rainy days the pumping stations spill water into the Foix river, a protected area in the Natura 2000 network.
This project had the aim of resolving this problem by constructing a new rain water pump alongside the current main pump and linking the pumping wells of both stations.
This project had the aim of resolving this problem by constructing a new rain water pump alongside the current main pump and linking the pumping wells of both stations.
The project increases the total pumping capacity in order to reduce overflowing into the Foix river as much as possible and to prepare the new pumping station to be connected with a hydrodynamic separator tank. By means of a vortex and a 6 mm-clearance screen, this tank holds back large and floating solids from the wastewater so this water can be discharged into the environment under suitable conditions. This vortex system is equivalent to a primary treatment and it reduces the concentration of suspended solids, sand, sediment and floating objects larger than 6 mm.
DETAILS
Technical data
The new Main Pumping Station entails the preservation of the current pumping well, in addition to the pumping well building. The project includes the construction of a new building for pumping rain water to the new hydrodynamic separator, which will hold back solids and floating objects before the rain water is discharged into the Foix river.
- Number of pumps: 2 pumps
- Maximum flow rate pumped to WWTP: 166 l/s
- Maximum flow rate pumped to separator tank: 400 l/s
- Nominal power per pump: 30 kW
The hydrodynamic separator that treats the outflow from the Main Pumping Station for diluted wastewater in heavy rainfall.
- Design flow rate: 400 l/s
- Total return flow rate: 63 l/s
- Inner diameter of the unit chamber: 4,200 mm
- Minimum diameter of the unit inlet pipe: 800 mm
- Minimum diameter of the system re-entry pipe: 400 mm
- Screen clearance: 6 mm
- 2 units to regulate the return flow to the PS well by vortex, vertical discharge.
- Width of overflow channel: 2000 mm
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