The site is in QiLianShan Road 145, Shanghai, China in a 90 000m² field in the city. The location was once occupied by a dying company which spilled various contaminants in the ground.

The project is a pilot test on a 25m² at 14m depth (heating zone) with 11 gas burners (V3/V4), a vapor treatment unit and a liquid treatment unit.

Construction of the watertight wall

In order to isolate the treatment zone from the ground water a wall was built in the ground around the treatment area. The wall is 1m thick and 14m deep.
During the treatment the results showed that at the outskirt of the heating zone, the concentrations were well above the objective. However, inside the heating area, the values were well beneath the target concentrations. One of the hypothesis to explain this difference is that the wall which retain the water is too porous or cracked which resupplies the treatment zone with water and contaminants.

• Installation: 2 weeks
• Treatment: 8 weeks
• Analyses & reports: 1 week
• Demobilization: 2 weeks

Wuwei project has been a challenging project due to:

• The first project in China
• A new partner: shared preparation and work in an intercultural context
• New technics and methods
• Contaminants and concentrations which caused corrosion issues
• The use of water retaining walls without water pumping during the treatment

The project ends as a success (targets completed): temperatures were not able to go above 100°C in most of the monitoring points but the stripping process decontaminated the soil. The blower from the vapor treatment unit was not appropriate for the project but the vapors were well condensed and treated.