Extraction system for N12 Kapellerfeld

PORR secures waste site

Markus Bride, Peter Ramberger, Andreas Rath

Container design of the extraction system (from left to right): Control and machine container, activated carbon filter (black) and biofilters (low blue roll-off container) (Image: PORR AG)

In the southern Weinviertel, a former gravel pit was filled with household waste until the 1980s. This waste site, N12 for short, is currently being reconditioned by PORR. The required soil air extraction system has been in operation since November 2017.

On the one hand, the N12 waste site is being reconditioned by the work of the specialist civil engineering company PORR. The department built a two-kilometer single-phase slot wall around the site of the former landfill. On the other hand, PORR Umwelttechnik is taking care of the surface profiling and the necessary earthworks.
In addition, the plant engineering part of the soil vapor extraction system will be handled by PORR Umwelttechnik.

To extract the landfill gases, which are still forming in the mass of the landfill, 96 gas probes were drilled. The electrotechnical equipment and the control technology were put in place in cooperation with PORR Equipment Services.

The extraction system

The various components of the soil vapor extraction system were also designed by PORR Umwelttechnik. These include, for example: the manometer, pressure and temperature measurements, the automatic control damper - which can add fresh air to prevent explosion limits from being exceeded - and vibration sensors. A 20-foot container was used as a machine room. Together with PORR Equipment Services, the system's hardware and software equipment was developed.

The landfill gas is extracted by means of filter tubes via the 96 gas levels and conveyed to the extraction system via nine collecting lines. The system is protected by a water separator and a filter in the pipeline. This is to prevent damage from water hammering or sucked particles on the fan. The extracted landfill gas is then cleaned via two activated carbon filters and a biofilter and transported into the atmosphere. The safety of employees is ensured by means of gas detectors and alarm devices. The system is operated for at least five years and should run maintenance-free. The automatic records are available online for the responsible technician. In case of problems, the system will send the error message by SMS.

Project data . PORR Umwelttechnik

Employer PORR AG
Contractor Consortium Sanierung Altlast N12 with PORR Umwelttechnik GmbH and PORR Bau GmbH . Division Specialist civil engineering
Project type Environmental engineering . Site-remediation
Project scope Disposal of 115.000to diaphragm excavation, delivery 145.000m³ A2 material for terrain profiling, 67.000m³ reclamation layer, 3ha afforestation, 96 gas extraction levels, exhaust system with 2.400m³/h extraction capacity (longest pipeline: 400m), 2x4m³ activated carbon and 48m³ biofilter for landfill gas treatment
Start of construction Octobre 2016
End of construction April 2019
Country Austria

Project data . PORR Bau GmbH . Specialist civil engineering

Employer PORR AG
Contractor Consortium Sanierung Altlast N12 with PORR Umwelttechnik GmbH and PORR Bau GmbH . Division Specialist civil engineering
Project type Environmental engineering . Site-remediation
Project scope Single-phase slotted wall with an area of approx. 65.000m², average depth 35m, deepest point 41m, width 80cm, integration 1.5m into the groundwater damming, 5 filter windows filled with activated carbon
Start of construction December 2016
End of construction December 2017
Country Austria

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