Remediation and closure of landfill Hasenbühl

  • Hasenbuehl Landfill, aerial view

Decontamination and shut-down of a landfill site according to the latest technology and the regulations currently in force.

Description

The Hasenbühl landfill site was brought into operation in 1976. Malfunctions of the degassing and dewatering system made extensive decontamination measures necessary. In consequence of incrustation and damage in the main leachate collector the decontamination operation was performed in accordance with the approval of the 1995 plans by the excavation of a manned mini-tunnel with a 20 m waste cover and a controlled through-press of the embankment round the edge using steel auxiliary piping. The degassing pipes had also been equipped with immersion pumps for dewatering. A completely new gas line system was installed. It was possible to increase the quantity of gas extracted from 50 m3/hectare to 250 m3/ hectare. The landfill site gas is utilised in a gas engine and the current produced fed into the power supply.
In order to reduce the formation of leachate the landfill site was covered with a temporary surface seal in three separately running construction phases in the years 1999 – 2007. The reduction of leachate quantities brought about significant cost reductions in the leachate treatment. The final sealing of the surface is planned to start in 2010.

Facts

Client: Schwäbisch Hall administrative district
bw-engineers Member Company: Klinger und Partner GmbH, Stuttgart
Project Volume: approx. 0,55 million Euro
Construction Volume: approx. 6,0 million Euro
Project Duration: 1993 – 2007

Services

The entire project management with all engineering services for the planning and site supervision is being carried out by a single source. To date the total duration of the project has been 15 years.

Planning of works and drawing up of documents for approval by an interdisciplinary planning team
Drawing up of tender documents for the separately running construction phases
Site supervision for each construction phase
Coordination of the work of specialist planners
Monitoring of health and safety protection

Technical Data

Decontamination of the main leachate line as a mini-tunnel, length 350 m
Creation of 15 combined dewatering and degassing pipes and 3,500 m of gas pipes
Temporary surface seal on an area of approx. 9 hectares with plastic liners, drain matting and mineral seals. Resulting leachate reduction from 23,000 m3/yr to 9,500 m3/yr.