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Groundwater remediation services Reading

As a soil and groundwater remediation specialist, Soilfix can take your projects from remediation strategy through to completion and final verification. Groundwater remediation is either carried out in isolation, or as part of a multi-disciplinary remediation project using the most practical and appropriate techniques.

Helping to clean up the environment with out groundwater remediation services in a man-mad lake
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Groundwater Remediation Reading

Groundwater Remediation Services

Soilfix has significant experience in a variety of conventional and more innovative in-situ / ex-situ groundwater treatment technologies to meet site specific remedial objectives. We have in-house technical capability and experience to deliver complex projects involving emerging contaminants such as PFAS compounds, pesticides/herbicides, phthalates as well as petroleum hydrocarbons, coal-tar derivatives and chlorinated solvents.

Selection of ‘Best Available Techniques’ for treatment of groundwater often utilises Remedial Options Appraisals, Sustainability / Carbon Assessments and pilot feasibility trials. A combination of techniques is often deployed to solve the groundwater contamination issue. All of these services are provided in-house using our experienced team under our multi-site mobile treatment permit.

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Ex-situ Groundwater Treatment Reading

On-site treatment of groundwater using modular plant and equipment serves a variety of purposes on remediation projects. Pump & treat systems can be used to enable deep excavations and/or removal of in-ground obstructions. These can also form an integral part of enhanced in-situ remediation schemes.  All on-site treatments plants are ‘bespoke’ to suit the particular challenge, often including the following:

  • Solids & oils separation, including lamella separators, baffled tanks, oil/water separators and flocculant / coagulant dosage systems;
  • Air stripping to remove high volatile organic content;
  • Water filtration, including use of sand filters, bag filters, granular activated carbon and other enhanced filtration methods for more complex contaminants such as PFAS; and,
  • Oxygen infusion / nutrient dosage systems for in-situ recirculation of pre-treated groundwater.

Process-based in-situ Remediation Reading

Often combined with treatment of soils in the unsaturated zone, in-situ groundwater treatment can be applied by Soilfix to a wide variety of settings and contaminants of concern. The following techniques are applied in-house:

  • Total fluids recovery via pumping wells – abstracted water / NAPL separated and treated using on-site plant;
  • Free-product (NAPL) recovery (with and without vacuum-enhancement) using pneumatic skimming, dual-phase and multi-phase vacuum extraction systems;
  • Free-phase recovery often enhanced through injection of surfactants or chemical oxidants to reduce surface tension on soil pores to speed up the remediation timeframe (and achieve higher levels of betterment);
  • Air sparge / SVE systems (including use of ozone); and,
  • In-well groundwater recirculation systems using pre-treated groundwater, on occasion infused with oxygen or nutrients to promote enhanced natural attenuation.

In-situ Fluid Injection Reading

Liquid remediation amendments can be injected at targeted locations / depths to promote enhanced flushing of contaminants, creation of a permeable reactive treatment systems, promote enhanced natural attenuation and/or chemical precipitation.  The injection design approach is selected by our experienced team, using pre-wells, direct-push geoprobe or other techniques. The following remedial techniques are applied using fluid injection:

  • In-situ chemical oxidation (ISCO) technologies for accelerated breakdown of more persistent organic compounds and/or enhanced total fluids recovery;
  • In-situ chemical reduction (ISCR) of chlorinated solvents using Zero-valent Iron (ZVI);
  • Oxygen Release Amendments to promote enhanced aerobic breakdown of petroleum hydrocarbons and some solvents;
  • Chemical precipitation (e.g. hexavalent chromium) using reducing agents;
  • Immobilisation of contaminants using a cement-bentonite grout; and,
  • Colloidal activated carbon (CAC) for treatment of dissolved organic compounds and metals, including more persistent compounds such as pesticides and PFAS.  a permeable reactive treatment zone (PRTZ) or reactive treatment ‘gates’ as part of a permeable reactive barrier (PRB).

Thermally-enhanced in-situ Treatment Reading

Soilfix has in-house experience in carrying out thermally-enhanced treatment of hydrocarbons, solvents or more persistent organics where logistics, tight delivery programme or geological constraints warrant a more active treatment approach.

Working with specialist partners to provide design support and specialist equipment, thermal treatment can be applied using both steam and electric conductive heating (geology pending), or a combination of both techniques in a more complex, multi-layered formation.

We also have experience in carrying out ‘post-thermal’ fluid injection treatment, to take advantage of the latent heat retained within the target formation. Significant betterment of residual groundwater concentrations can be achieved as a result.

Talk to our team

Peter Howland
Managing Director

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