Anaerober in-situ-Metabolismus aromatischer Kohlenwasserstoffe unter wechselnden Redox-Verhältnissen bei der Sanierung des Grundwasserleiters an einem ehemaligen Gaswerksstandort

Anaerobic microbial degradation of aromatic hydrocarbons and the occurrence of metabolites were studied in detail in the groundwater of the former manufactured gasplant site at Düsseldorf-Flingern especially with respect to changes due to remediation of soil and groundwater. Physico-chemical effects such as variations in ground-water table, processes of transport and sorption as well as microbial degradation cause a specific distribution and composition of the aromatics in the contaminant plume. The microbial degradation of the monoaromatics under sulfate-reducing conditions was classified as follows: Strongly reactive: Toluene, benzene, 1,2,4-trimethylbenzene, styrene. Medium reactive: Xylenes, 1,3,5-trimethylbenzene, m-ethyltoluene. Hardly reactive: Ethylbenzene, methylstyrenes, 1,2,3-trimethylbenzene. Under nitrate-reducing conditions, benzene appeares to be resistant and ethylbenzene more reactive. Degradation of the aromatics coupled to sulfate-reduction is significantly disturbed probably by diffusion of athmospheric oxygen. Short term addition of nitrate to the groundwater only enhances the transformation of toluene and 1,2,4-trimethylbenzene. Several aromatic acids were found in the groundwater as intermediates of the microbial degradation and could be attributed to the corresponding aromatic compounds in most cases. The concentration ratio of aryl succinic acids such as benzylsuccinic acid and naphthylsuccinic acids to the corresponding monoaromatic acids such as benzoic acid and naphthoic acids may be used to indicate the intensity of the microbial degradation.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2001

Author dc:creator

• Schmitt, Reinhard

Contributors dc:contributor

• Püttmann, Wilhelm

• info:eu-repo/classification/ddc/550
• Geowissenschaften
• Düsseldorf
• Gaswerk
• Porengrundwasserleiter
• Aromaten
• Mikrobieller Abbau
• Anaerobier

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123734%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:62142