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In-situ bioremediation. Increase of effectivity by the addition of humic acid

: Kördel, W.; Klöppel, H.; Hund, K.

Forschungszentrum Karlsruhe GmbH:
Contaminated soil '98. Proceedings of the Sixth International FZK/TNO Conference on Contaminated Soil. Vol.2
London: Telford Publishing, 1998
ISBN: 0-7277-2675-7
International Conference on Contaminated Soil <6, 1998, Edinburgh>
Conference Paper
Fraunhofer IUCT ( IME) ()
in-situ remediation; PAH; hydrocarbon; leaching behaviour; DOC; DHS from compost

It is well documented that aqueous solutions of dissolved humic substances (DHS) increase the solubility of poorly soluble organic contaminants (Wahle and Kördel, 1997, Rebhun et al., 1996, Kördel et al., 1997). The DHS, through hydrophobic binding of organic contaminants, reduce their sorbability and facilitate desorption and remediation. After penetration through the soils the DHS which is loaded with contaminants can easily be coagulated - precipitated and separated by press-filtration. A further advantage of DHS is their availability and inherent degradability. They are natural soil constituents and they can be used as carbon sources by microorganisms without stimulating the growth to an unwanted extend.