Acoustically enhanced dissolution and/or mobilization of NAPL

Acoustic Stimulation (AS), is a technology in which an acoustic signal is introduced to the subsurface with the aim to affect NAPL phases. The application of AS as an enhancement tool for remediation soils contaminated with LNAPL (e.g. mineral oil) or DNAPL (e.g. chlorinated solvents) has been validated in lab studies, but there is still limited field experience. During a HIP pilot (2006-2009, with contractor HMVT) two field pilot tests were conducted with AS and effects on NAPL phases were recorded both at the LNAPL and DNAPL site. Currently, Deltares is supporting the set-up of pilot testing of AS at a DNAPL site in Denmark. Application possibilities: dedicated introduction of optimized acoustic signal for the optimization of a particular in-situ remediation technology or contaminant extraction technology. Alternatively, if acoustic drilling at the site is foreseen, the effect of acoustic stimulation may be taken advantage of through careful timing and spatial design of the remediation effort.

Use of renewable energie resources for soil remediation

Combining renewable energie and in situ soil remediation.

Renewable energie can be used for electricity and heat supply during the in situ remediation. At this moment contractor HMVT is executing a project in Bilthoven (NL) where they use solar power to increase the temperature of the soil to enhance natural attenuation. In addition solar and wind power are used to deliver the required energy for the in situ pumping system. The project started in May 2012 and will be finalized in May 2016. The first results show that it is possible to increase the soil temperature at least to

20 °C and that the system is self supporting in energy.