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Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-diss000004090

Untersuchungen zum mikrobiellen Abbau von chlorierten Aromaten in einem Suspensions-Membranreaktor

Veröffentlichungsdatum
2002-01-23
Autoren
Kappler, Axel  
Betreuer
Nehrkorn, Alexander  
Gutachter
Räbiger, Norbert  
Zusammenfassung
Due to the circulatory management law in Germany originated a greater demand for environmental techniques integrated in production processes. In this work a new Suspensions-Membranereactor (SMR) which eliminates hard degradable pollutants out off a mixture of wastewater selectively was investigated and compared with a conventional Airloop-Reactor (AIR). Initial, the microflora responsible for the degradation of the model pollutants 3-chlorobenzoate (3-CBA) and 4-chlorophenol (4-CP) was described. 173 isolated bacteria were characterized morphologically and physiologically. The most important species were identified as Variovorax paradoxus, Alcaligenes denitrificans, Pseudomonas fluorescens, Burkholderia pseudomallei and Xanthomonas campestris. To describe the pathways of the degradation different methods were combinated. Examinations of the reaction kinetics and the use of UV-spectroskopy, ion chromatography, HPLC and the newly developed method HPLC coupled with mass spectrometry proved an initial dechlorination followed by an ortho-ring cleavage of an not detectable aromatic intermediate as the main pathway in the SMR. The dehalogenation was the limiting step in the degradation of 4-CP but not of 3-CBA. The comparatively high reaction rate of this compound only depended on the conversion of the aromatic metabolites. The degradation of both compounds could be inhibited by too high substrate concentrations, but no halogenated metabolites and "dead-end-products" occurred supposing a high operation stability. The examinations of culturable cells (CFU), total counts, metabolic active cells and physiological capacities indicated not only a higher amount of bacteria but also the more efficient organisms in the SMR. Considering the quicker turnover rates in comparison to the AIR the SMR showed a better growth of a specialized microflora and a better selective degradation of wastewater compounds.
Schlagwörter
3-chlorobenzoate

; 

4-chlorophenol

; 

microbial degradation

; 

in-vitro-activity

; 

kinetics

; 

modular process engineerings

; 

HPLC

; 

HPLC-Mass-Spectrometry
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Deutsch
Dateien
Lade...
Vorschaubild
Name

E-Diss409_kappler.pdf

Size

776.43 KB

Format

Adobe PDF

Checksum

(MD5):3d4dcc81f0a6162159ce94ec7528b269

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