Reuse of Treated Wastewater from Mirleft WWTP for Green Space Irrigation
Project for the reuse of treated wastewater from the Mirleft Wastewater Treatment Plant (WWTP) for green space irrigation. Works include the construction of maturation basins, WWTP upgrading (tertiary treatment), construction of a pumping station and a 250 m³ semi-buried reservoir, and the deployment of an HDPE distribution network with a drip irrigation system.
- Basins & Clarifiers: Maturation basins (geomembrane lining) and tertiary treatment (sand filter, UV reactor).
- Pipes & Manholes: Double-wall HDPE pipe network (DN250-DN300), reinforced concrete manholes (inspection, drop, blind) and connection boxes.
- Pumping & Storage: Prefabricated pumping stations (Kits) and a 250 m³ semi-buried reservoir.
My role and responsibilities
-Analysis of Tender Documents and Technical Specifications (CPS/CCTP).
-Execution studies, as-built plans, and dimensioning calculation notes (hydraulic, reinforced concrete).
-Supervision of civil engineering works: maturation basins, pumping station, and 250 m³ reservoir.
-Control of the installation and connection of tertiary treatment equipment (sand filter, UV reactor, softener) and hydro-mechanical equipment.
-Coordination of watertightness tests, operational tests, and industrial commissioning of the facilities.
Project scope
The project focuses on wastewater valorization and includes:
-Execution of watertight maturation basins.
-Upgrading of the Mirleft WWTP (tertiary treatment).
-Civil engineering and equipment of a discharge pumping station.
-Civil engineering and equipment of a 250 m³ semi-buried reinforced concrete reservoir.
-Laying of a discharge pipeline and a distribution network for irrigation.
Construction methods
-Maturation Basins: Earthworks, shaping, installation of a 1.5 mm HDPE geomembrane over anti-puncture geotextile, and installation of an anti-algae shading net.
-Civil Engineering: Pouring of waterproof reinforced concrete (B30) for the reservoir and pumping station, with careful treatment of construction joints and water-stops.
-Pipelines: Trench opening, placement of bedding (sand or gravel), laying of HDPE pipes, and backfilling in layers compacted to 95% Modified Proctor density.
-Equipment: Installation of submersible pump sets, 316L stainless steel piping, valves, electromagnetic flowmeters, and anti-water hammer bladder tanks.
Technical specifications
-Tertiary Treatment: Continuous backwash sand filter (Q ≈ 32.25 m³/h), UV reactor (Q ≈ 32.25 m³/h), ion exchange softening system, and lime dosing.
-Pumping Station: Submersible pump set (Q = 31.25 m³/h, TDH = 70 m), 100 L anti-water hammer bladder tank, control panel with soft starter, and backup generator.
-Reservoir: 250 m³ semi-buried reinforced concrete structure with watertight lining and peripheral drainage.
-Distribution Network: HDPE pipes (DN 15 to DN 140, PN 10), self-regulating and self-flushing drippers, section valves, triple-function air valves, and washout chambers.
During works
