Groundwater Decontamination: Robust Piezometers for Contaminated Sites

Reliable level measurement is crucial when decontaminating polluted sites such as landfills or industrial areas – even under extreme conditions with aggressive media.

Whether old landfills, coal heaps, or former industrial sites: contaminated soils often remain, posing risks to humans, the environment, and groundwater. For remediation, contaminated zones are targetedly flushed – where robust piezometers play a central role.

Decontamination Processes – How It Works

Typically, contaminated groundwater is pumped to the surface, cleaned, and reintroduced as rinsing water. Hydraulic barriers prevent spread outside the target area. Piezometers monitor this process – precisely, durably, and resistant.

Even after the remediation is complete, piezometers remain in use to monitor water levels and flow direction over extended periods.

Materials and Cables – Critical Success Factors

Depending on the type of pollutants and environment, special requirements apply:

• Enclosure: Stainless steel is standard; for saltwater, titanium, and for galvanic loads, PVDF (e.g., ATM/NC series by STS)
• Cables: Special caution with diffusion – suitable are PE, PUR, or FEP cables. The latter withstands up to 110°C.

Safe Installation and Long-Term Operation

Proper installation protects piezometers from failure:

• Cable routing: Protective hoses against debris, abrasion, and kinks
• Strain relief: Recommended for deep installations or unstable environments
• Mounting: G ½ threads or clamp rings for turbulent media

Explosion Protection: Essential for Hazardous Materials

Many contaminants contain substances with explosion potential. ATEX-certified piezometers ensure safe operation even in critical zones.

Conclusion

Reliable level measurement is essential for contaminated site remediation. With appropriate materials, explosion-proof design, and correct installation, STS piezometers are the first choice for long-term, stable, and safe groundwater monitoring in harsh environments.