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The Degradation of 2-Chlorophenol in an Upflow Anaerobic Sludge Blanket (UASB) Reactor

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The Degradation of 2-Chlorophenol in an Upflow Anaerobic Sludge Blanket (UASB) Reactor The Degradation of 2-Chlorophenol in an Upflow Anaerobic Sludge Blanket (UASB) Reactor Zur Erlangung des akademischen Grades eines DOKTOR-INGENIEUR von der Fakultät für Bauingenieur- und Vermessungswesen der Universität Fridericiana zu Karlsruhe (TH) genehmigte DISSERTATION von Sivawan Phoolphundh, M.Sc. aus Bangkok, Thailand Tag der mündliche Prüfung : 27.06.1997 Hauptreferent : Prof. Dr. rer. nat. J. Winter Korreferent : Prof. H.H. Hahn, Ph.D. Karlsruhe 1997 Die vorliegende Arbeit entstand während meiner Tätigkeit als Doktorandin am Institut für Ingenieurbiologie und Biotechnologie des Abwassers der Universität Karlsruhe. Mein besonderer Dank gilt Herrn Prof. Dr. rer.nat. J. Winter für seine vollste Unterstützung und Betreuung dieser Arbeit sowie für wertvolle Hinweise und anregende Diskussion. Herrn Prof. H.H. Hahn Ph.D. danke ich für die Übernahme des Korreferates und die Durchsicht der Arbeit. 81 Herrn Dipl.-Ing. R. Staud danke ich herzlich für seine freundliche Unterstützung seit Beginn meines Studiums in Deutschland. Mein Dank gilt weiterhin den ehemaligen und aktuellen Mitarbeitern des Institutes, die durch ihre Hilfsbereitschaft am Gelingen dieser Arbeit beteiligt waren. An dieser Stelle möchte ich Frau Orapim Bernart danken für ihre mir am Herzen liegende freundliche Unterstützung sowie meiner eigenen Familie. Für die finanzielle Förderung meines Studiums in Deutschland sei dem Deutschen Akademischen Austauschdienst (DAAD) gedankt. Sivawan Phoolphundh Table of contents page 1. Introduction .......................................................................................... 1 2. Materials und methods ......................................................................... 16 2.1 Laboratory-scale UASB reactor ........................................................................ 16 2.2 Sources of granules and inoculum ..................................................................... 16 2.3 Reactor operation ............................................................................................. 19 2.4 Analytical procedures ....................................................................................... 20 2.5 Chemicals ......................................................................................................... 22 2.6 Batch experiments ............................................................................................ 23 2.6.1 Preliminary test ................................................................................................ 23 2.6.2 Determination of the anaerobic biodegradation potential and toxicity of each monochlorophenol on unacclimated sludge .......................................... 23 2.6.3 Determination of the kinetics of 2-CP dechlorination ........................................ 24 2.6.4 Determination of the kinetic parameters of glucose degradation ........................ 24 2.6.5 Determination of glucose concentration ............................................................ 24 82 2.6.6 Determination of biosorption of PCP to anaerobic granular sludge .................... 26 3. Results .................................................................................................... 27 3.1. Performance of the UASB reactor for the treatment of glucose containing synthetic wastewater (reactor R 1) ................................................... 27 3.1.1 COD and TKN removal efficiency .................................................................... 27 3.1.2 Methane production ......................................................................................... 29 3.2. Acclimation and enrichment of chlorophenol-degrading granules ...................... 30 3.2.1 Preliminary test ................................................................................................ 30 3.2.2 Anaerobic biodegradation potential of unacclimated sludge for different substituted monochlorophenol (2-CP, 3-CP &4-CP) ........................... 31 3.2.3 Toxicity of monochlorophenols on unacclimated sludge .................................... 34 3.2.4 Effect of organic substrates on dechlorination of monochlorophenol ................. 37 page 3.3 Optimal condition for operating a continuous UASB reactor for treatment of a 2-CP containing synthetic wastewater ....................................... 38 3.3.1 Optimal concentration of glucose amendment .................................................. 38 3.3.2 Optimal pH for dechlorination ......................................................................... 39 3.4 Performance of the UASB reactor for the treatment of 2-CP containing synthetic wastewater (reactor R 2) ................................................ 42 3.4.1 Response to hydraulic loading schock ............................................................. 42 3.4.2 Response to temperature schock ..................................................................... 42 3.4.3 COD removal, 2-CP removal and biogas production ....................................... 44 3.4.4 Chloride ion production .................................................................................. 46 3.5 Mineralization and dechlorination rate of 2-CP in batch culture ....................... 47 3.6 Dechlorination kinetics ................................................................................... 50 3.7 Effect of glucose on dechlorination at higher 2-CP concentration .................... 52 3.8 Kinetics of glucose degradation ...................................................................... 55 3.9 Degradation potential of 2-CP-degrading granules for other chlorophenols ........................................................................................ 59 3.9.1 Glucose as electron donor .............................................................................. 59 3.9.2 Other electron donors .............................................................. ...................... 65 3.10 Biosorption of PCP by anaerobic granular sludge .......................................... 76 4. Discussion ............................................................................................ 80 83 5. Summary ............................................................................................. 96 6. References .......................................................................................... 101 1 INTRODUCTION Chlorophenols are widespread toxic compounds that are included in the U.S. Environmental Protection Agency list of priority pollutants. They are used in industry primarily as biocides as well as preservatives for wood, glue, paint, vegetable fibers and leather (Muller and Caillard, 1986). Chlorophenols may also be formed in the chlorination of surface waters and wastewasters. Additionally, chlorophenols have been found to be present in waste waster and sludges, sediments, ground water (due to leaching from contaminated soils), surface water (due to surface runoff or direct industrial waste discharges) and rainfall (cited in Krumme and Boyd, 1988). The toxicity of chlorinated phenols tends to increase with their degree of chlorination and because few microorganisms can decompose them, the more highly chlorinated phenols tend to accumulate in the environment. Natural removal of chlorophenols from the environment can be achieved by photodecomposition and biodegradation. The biodegradation of chlorophenols has been studied in both, aerobic and anaerobic systems. Under anaerobic conditions chlorine substituents can be removed from the aromatic ring by reductive dechlorination. In this process chlorines are replaced by hydrogen, resulting in less toxic and less recalcitrant compounds. Anaerobic processes are reported to be suitable for the dechlorination of low to highly-chlorinated phenolic compounds while aerobic systems have a tendency to be more suitable for biodegrading the less- halogenated phenolic compounds. The degradation of aromatic compounds A large variety of aromatic substances participate in life processes and form an important part of the natural carbon cycle. In nature aromatic compounds are derivatives of the secondary metabolism of plants, biological and chemical cleavage of lignin, and bioconversion of aromatic amino acids (cited in Knoll & Winter, 1989). Furthermore, many aromatic compounds are produced by the chemical industry for utilization as pesticides, insecticides, herbicides, detergents, solvents, wood preservatives, etc. Some xenobiotic benzenoid structures are relatively recalcitrant, requiring the competence of the microbial world for their dissimilation. 84 Under aerobic conditions aromatic substrates are metabolized by a variety of bacteria, with ring fission accomplished by mono- and dioxygenases. Molecular oxygen is essential for these enzymes to function since it is incorporated into the reaction products. Aerobic degradation pathways and elimination reactions for substituents have been reviewed somewhere else (e.g. Evans, 1969; Dagley, 1971; Wallnöfer and Engelhardt, 1984; Schwien et al., 1988). As early as 1934 the degradation of aromatics during methane fermentation was reported by Tarvin and Buswell (1934). All of the ring carbons of the aromatic substrate were accounted for as CO2 , CH4 and microbial cells. This pioneering quantitative study of the methanogenesis of organic compounds established the stoichiometry of the reaction as follows: a b n a b n a b CnHaOb + (n - - ) H2O ( - + ) CO2 + ( + - ) CH4 ........(1) 4 2 2 8 4 2 8 4 The metabolic fate of organic compounds and their mineralization
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