Monitored Natural Attenuation


A passive approach can be just as effective!

Monitored Natural Attenuation

Natural processes will degrade many contaminants over time: Monitored Natural Attenuation (MNA) focusses on recognizing when natural attenuation alone suffices to meet the remedial targets within the time frame available, and on monitoring its progress. MNA is often deployed as the final remedial technique in a suite of multiple technologies. Deployment of MNA as sole remedial strategy can, under specific conditions, be a viable option.


Natural attenuation is ubiquitous, but its efficacy depends on many factors. Checking the correct parameters enables us to verify its suitability in any specific case. Laboratory testing may help to generate insight into degradation pathways and rates. Understanding site geology, hydrology, geochemistry, and soil microbiology, is of the essence.

Enhanced phytoremediation

Interest in sustainable extensive technologies to address specifically low and very low levels of contaminants has grown in the past years. Plant (tree) roots create very specific microcosms in the soil where contaminants are degraded naturally. Efforts required to remove contaminants are tested against environmental benefits attained when selecting remedial options.