Temporary dewatering pipeline and demolition water treatment station
The objective was to treat demolition and concrete work wastewater generated during the rehabilitation of a section of the north tube of the Louis Hyppolite Lafontaine tunnel, in order to discharge it into the City of Montreal’s stormwater network while meeting all regulatory standards.
Capacity : 100-140 m³/h (440-620 gpm)
Challenges
- Treat water with high suspended solids and elevated pH
- Meet discharge standards: suspended solids below 500 mg/L and pH between 6,9 and 9,5
- Reduce potable water consumption by maximizing recirculation
Outcomes
Deployed Solution
- Liquid dosing unit and 8’’ dissolution unit
- Two 40 foot settling tanks and one 20 foot tank
- Two bag filtration units to return clean water to the work area or the environment as needed
- Personnel training to ensure full operational autonomy
- Real time data acquisition system
Results Achieved
- Discharged water fully compliant with municipal standards
- Significant reduction in potable water usage thanks to recirculation
- Stable, high performing system with remote support capability
The client benefited from a turnkey service fully adapted to their reality and the specific needs of the project. Our team notably adjusted the size of the settling tanks to match the required volumes, ensuring optimal performance on site.