Tunneling / Construction Sites

In tunnelling, at construction sites and for groundwater remediation, huge amounts of effluents have to be purified.

During a tunnel construction, it can be expected that layers, carrying groundwater, are bored into or through. In this case, large amounts of water, usually soiled with drilling dust/dirt, have to be purified, as it is impossible to pump the water into the receiving water. Furthermore can be expected that in case of a mechanical breakdown, hydraulic oil may mix with the water. Using a lamella separator, the water can be treated and pumped into the receiving water. With a lamella separator, not only particles can be separated, but also oils concentrated, which can be skimmed off the water surface.

During the tunnel heading, walls are concreted at the same time. The concrete is produced outside the tunnel and pumped to the section, where it is processed via long pipelines. The pipelines have to be flushed if interferences occur during the tunnel driving. The concrete is flushed out with water, individual fractions separated and cementitious water remains. The cement particles can be separated using a lamella separator. The individual fractions can be reused at a later time. Therefore, not only raw materials are saved and production plants protected (manufacturing optimisation, reduced effort for cleaning and maintenance), but also emissions to the environment are reduced.

A further application of the lamella separator is the groundwater remediation. Here, the groundwater, containing toxic substances, is pumped out and purified by a precipitation / flocculation step. Thereby the dissolved substances precipitate, are present as particles and can be separated by sedimentation.

A similar application is the treatment of groundwater on large scale construction sites. It is possible, not only to separate particles, but also to decontaminate contaminated soil. After the treatment, the water can be pumped into the receiving water or the sewer. Especially on old industrial sites, hydrocarbons, tars and other toxicities are present in the soil.

On urban construction sites, leaving trucks often carry a lot of dirt onto the streets. A tyre washing plant prevents soiling and therefore the danger of accidents as well. However, commercially available tyre washing plants only have small settling tanks. In order to ensure sufficient clean water, large amounts of fresh water are required and heavily soiled effluent occurs. If the effluent is led into the canalisation, sediments and disturbances in the effluent plant will occur. Through the use of a lamella separator, the water can be purified in a bypass. The sludge is exported by a pump and thickened in a dewatering container.

Advantages

  • compact design, little space required
  • compliance with treatment rate restrictions
  • minimum effort for cleaning and maintenance
  • low wear and tear
  • minimum energy and chemical consumption
  • increased process stability, failure-free operation
  • additionally recycling of reusable material
  • possibility to combine with other processes

Our references

In the following, we would like to give you an overview of projects we have implemented in the recycling industry. If you require any further information or explanation, please do not hesitate to contact us.

Leiblein GmbH – effluent solutions for construction sites and tunnelling

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