Sensor, spol. s r.o.

Non-Hazardous Landfill - Case Study


Courtesy of Sensor, spol. s r.o.

Municipal solid waste landfill is site for domestic day-to-day waste disposal. Its also known as tip, rubbish dump, dumping ground, etc.

Material stored at solid waste landfill is isolated from the environment by sealing layer which can be HDPE or LDPE or even PVC geomembrane. If such geomembrane leaks, the contaminant from landfill is spreading in direction of the groundwater flow. This way it can reach long distance and contaminate the environment for a long time. Such contamination can cause health problems not just to people living in near vicinity of the landfill.

For that purpose we have developed permanent monitoring system SENSOR DDS LMS which warns us when a leak in geomembrane occurs so it can be repaired before any harm to the environment is done.

Solid Waste Landfill in Eastern Asia Sensor DDS Fixed Installation (Sensor DDS LMS)

General project info:

  • Domestic waste landfill
  • Area of 25 000m²
  • SENSOR DDS LMS system installed
  • Sensor grid 5x5m (leak resolution cca 25m²)
  • 1 000 sensors and 120 km of cable used
  • Single geomembrane HDPE 2.0mm

Landfill design cross section (from bottom to top):

  • Compacted clay 50 cm
  • SENSOR DDS FIXED components 5x5m
  • HDPE 2.0mm Geomembrane
  • Protective geotextile
  • Drainage layer – gravel
  • Solid domestic waste

At this site we have applied our standard SZLP (Sensor Zero Leakage Philosophy) which means that apart from permanent leak monitoring system installation we have been monitoring whole landfill construction process consisting of:

  • SENSOR DDS FIXED – buried components installation in grid of 5x5m
  • SENSOR DDS MIT – survey straight after geomembrane installation to locate any pinholes made during installation or transport of geomembrane
  • SENSOR DDS Mobile – dipole survey after installation of drainage, protective layer to locate any damage which could occur during placing overliner onto the geomembrane
  • First geomembrane integrity control using installed permanent offline SENSOR DDS LMS system on site

Permanent monitoring system SENSOR DDS  was installed on this project in 2013. Below the liner we installed sensors in grid of 5x5m which gives us leak resolution of around 25m². After installation of geomembrane we applied bare liner testing using our Arc Tester – SENSOR DDS® MIT Arctester.

The most damage was identified after installation of protective drainage layer where we located 15 faults of geomembrane using portable testing device for covered geomembrane – SENSOR DDS® Mobile.

We monitor this waste landfill once in 12 months with our portable measuring device SENSOR DDS® LMS.

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