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Article | REF: G2592 V1

Monitored Natural Attenuation (MNA): decontamination technique

Authors: Bart Vander VELPEN, Werner STAES

Publication date: October 10, 2013

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1. Natural attenuation process

Natural attenuation is defined as a set of active physical, chemical or biological processes which, under favorable conditions, act without human intervention to reduce the risk of dispersion associated with contamination. Natural attenuation in soil and groundwater takes three forms :

  • transformation of contamination ;

  • reduction in the mass or concentration of contaminants;

  • reduced mobility and bioavailability of contaminants (figure

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