Today, the tender for the construction of the WWTP, with a daily average flow of 413 m³/day, and the storm tank, with a capacity of 2,280 m³, in the industrial estate of ‘Los Hitales’, is published on the State Procurement Platform
May 5, 2025
Castile and Leon |
Department of Environment, Housing, and Territorial Planning
The Government of Castile and Leon is addressing, through Somacyl, the construction of a new wastewater treatment plant (WWTP) to treat the wastewater produced in the Industrial Estate of ‘Los Hitales’, in the town of Bernuy de Porreros, Segovia, a storm tank to manage the rainwater collected in the new roads, and the discharge outfall responsible for carrying the water to the San Medel stream. These infrastructures will meet the requirements set by the River Basin Authority for discharges into watercourses.
The regional government, as part of its policies to boost industrial activity in the region and promote territorial balance, awarded the expansion works of the industrial estate ‘Los Hitales’ in Bernuy de Porreros in July 2024 for an amount of 11,849,547 euros. The works started in September 2024, with an estimated completion period of 16 months, and currently, they are 23% complete.
The ongoing works mainly involve earthmoving, road surfacing, trenching, installation of pipes and collectors, construction and/or placement of wells, chambers, and manholes, and backfilling.
The industrial estate ‘Los Hitales’ has a total area of 1,084,025 m², of which 767,891 m² are allocated for productive use. The current total investment in the project amounts to 16,082,677 euros (plus VAT), distributed as follows: 11,849,547 euros for the urbanization of the estate, 2,829,974 for the construction of the storm tank, and 1,403,155 for the new wastewater treatment plant (WWTP).
WWTP
The new wastewater treatment plant (WWTP) will be located to the west of the industrial estate ‘Los Hitales’ and will be designed to treat a daily volume of 413 m³. In its water line, it will feature an arrival structure that includes a coarse screen with a bivalve bucket for solids collection, a manual 40 mm bar screen, and a raw water pumping well. The system also includes a compact pretreatment, flow measurement for treatment, primary treatment using an Imhoff tank, biological treatment with rotating biological contactors (RBC), secondary settling equipped with a peripheral driven scraper bridge, and flow measurement of treated water through a Parshall flume.
Regarding the sludge line, there will be a chamber for purging secondary sludge to the digester, a gravity collection system for floatables and scum towards the head of the plant, as well as a sludge thickener that will allow more efficient management of the residues generated in the purification process.
Storm Tank
The works involve a new storm tank adjacent to the new WWTP, which will collect rainwater from the estate, both existing and expanded.
The storm tank structure has external dimensions in plan of 30 x 20 meters. The free height of the tank is 6.25 meters before reaching the low water channel. This height gradually decreases to allow gravity drainage of the water. The maximum water level in the tank is 4 meters.
To complete the installation, the construction of a coarse screen and a pumping well has been planned. The latter, located at the end of the low water channel, will be equipped with two centrifugal pumps of 63.3 m3/h, which will convey the retained rainwater to the new WWTP of the estate in Bernuy de Porreros, where it will be treated properly for subsequent discharge.
Outfall
To convey the rainwater from the estate expansion collected in the storm tank to discharge it into the San Medel stream, an outfall of 1,800 mm in diameter, reinforced concrete, and a length of 982 m has been designed.
During the execution of the works, the roads of Zamarramala and Valseca will be affected, and they will be restored to their original state upon completion of the works.