In-Situ Phytoremediation of TNT-Contaminated Soil

Autor: Tobias Frische, Peter Behrend, Jürgen Warrelmann, Ulrich Walter, Hartmut Koehler
Rok vydání: 2002
Předmět:
Zdroj: Acta Biotechnologica. 22:67-80
ISSN: 1521-3846
0138-4988
DOI: 10.1002/1521-3846(200205)22:1/2<67::aid-abio67>3.0.co;2-c
Popis: Parts of the area of the derelict World-War-II ordnance plant Werk Tanne (Clausthal-Zellerfeld, Harz, Germany) are heavily contaminated by chemicals resulting from TNT production and particularly by TNT itself. High soil contamination has to be treated with ex-situ methods but for the extended contamination of surface soil, in-situ phytoremediation is appropriate. The TNT-degrading potential of the rhizosphere of the planted trees and shrubs themselves is augmented by highly active mycorrhiza and white-rot fungi. A phytoremediation measure was established to scale with heavy machinery (soil grader), including the incorporation of white-rot fungi into the soil and planting of mycorrhized trees and shrubs. The effects of site preparation, mycorrhized rhizosphere and white-rot fungi on the degradation of TNT were assessed over one year using a complex monitoring scheme, including a battery of five biotests and field investigations of selected indicators (soil mesofauna, decomposition). The results of the monitoring showed the great influence of the grading procedure for site preparation, a diversified sensitivity of the biotest battery and complex reactions of the field indicators. The grading procedure effectively reduced the contamination (almost 90% within the first six months regardless of the initial levels). The phytoremediation measure as a whole reduced hazards of transport of nitro-aromatics by dust or leachate, initiated a secondary succession of the soil ecosystem that could transform the remaining TNT and metabolites over a longer period of time, and thus proved to be an effective decontamination measure applicable in large-scale technology.
Databáze: OpenAIRE
Externí odkaz: