The depletion of contaminants in soil is not only based on degradation or mineralisation, but also on the fact that a fixation or immobilisation of the xenobiotic substances as bound residues takes place within the soil matrix. This binding of organic contaminants (called a humification process if bound to soil humus) can reduce the bioavailable and analytically detectable part of the xenobiotics. The binding was investigated in detail by the use of 14C-labeled substances for PAH and TNT in the last decades and this immobilisation process has been proposed as a remediation measure. The intentional humification process may be achieved by adjusting bioremediation process parameters such as the supplementation of soil with organic substances (compost etc.) or by changing the incubation conditions (anaerobic and aerobic phases).
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- Humification of PAH and TNT During Bioremediation — Evaluation of Long Term Risk and Sustainability
- Springer Berlin Heidelberg