Dissertation > Excellent graduate degree dissertation topics show

Study on Degradation of Chlorophenol by Dominant Mixed Bacteria

Author: GengLiang
Tutor: LuGuangHua
School: Hohai University
Course: Environmental Science
Keywords: Chlorophenol Complex bacteria Tolerated Biodegradable Cometabolism
CLC: X703
Type: Master's thesis
Year: 2006
Downloads: 186
Quote: 1
Read: Download Dissertation

Abstract


The return sludge from Yangzi Petrochemical industrial sewage treatment plant wells to extract the active sludge samples, chlorophenols as the sole carbon and energy tolerance composite bacteria were isolated, cultured and domesticated. Consists Flavobacterium (Flavobacterium), Acinetobacter species (Acinetobacter), Alcaligenes (of Alcaligenes), sticks (Mycopiana) Acinetobacter and Pseudomonas species (Pseudomonas) were identified. Bacterial growth inhibition experiments show that bacterial of composite bacteria isolated mixed chlorophenols tolerated than natural water bodies (Yangtze), and after 2 - chlorophenol selective medium domestication, composite bacteria to poison tolerated significantly improved. Domesticated complex bacteria-degrading microorganisms, use of laboratory simulation method to study the characteristics of three single-Chlorophenol biodegradation. Results demonstrate that the three single chlorophenols fall isomers, but chlorine atom substituted in different positions, their biodegradability have a greater impact, degradation balance after removal rate of the order of: 3 - chlorophenol gt; 2 - chlorophenol gt; 4 - chlorophenol. 3 - chlorophenol target contaminants, research compound exposure concentration composite inoculation, water pH value and other conditions the rate of biodegradation of the target compound and the final removal rate. The results show that the complex bacteria strong adaptability, can be adapted to the pH from 3.5 to 9.5, a wide range of environmental pH changes. Reduce the concentration of pollutants in the water, and composite bacteria inoculum size, and can improve the efficiency of biodegradation of the target compounds. Add the growth substrate chlorophenols biodegradable characteristics have an important impact. The phenol join conducive to microbial utilization of 3 - chlorophenol. Microbial degradation of phenol as a growth substrate for priority, followed by 3 - chlorophenol was only decomposition, and increased metabolic efficiency, 3 - the chlorophenol degradation efficiency increase of concentration of phenol added to improve. Compared with the situation alone, 2 - chlorophenol and 3 - under the conditions of coexistence chlorophenol, poison lag phase and reached the degradation of the balance of the time has a significant hysteresis the two chlorophenols half-life was significantly longer, final removal rate also have been reduced. Visible, of two chlorophenol coexist on the composite bacteria degradation inhibition, their combined effects of an additive effect. Biological degradation of chlorinated phenols dynamics study found that 3 - chlorophenol degradation process has produced two major intermediate metabolites exist obviously have accumulated degradation process. Its metabolic pathway is presumed to: ortho oxidation occurs under the action of a single oxidase generates chloro catechol; chloro catechol open loop and then in the ortho position under the action of 1,2 - dioxygenase; within the esterification process, the release of chloride ion, and is oxidized to maleic acid acetic acid, and finally into the Krebs cycle.

Related Dissertations

  1. The quinoline degrading bacteria and diesel Nitrogen,X172
  2. Study on the Preparation of Novel β-PbO2 Electrode and Its Electro-catalytic Performance,X703
  3. A Study on Preparation of Modified Beta F-PbO2 Electrode and Its Electro-catalytic Performance,X703
  4. Synthesis of Telbivudine Intermediate and 3-amino-2-hydroxyacetophenone,TQ244.2
  5. Phase I Trial of WuTac, A Murine Anti-CD25 Monoclonal Antibody, Tolerance and Pharmacokinetics of Multiple Doses in Renal Transplant Patients,R96
  6. Research of Ti/PbO2 Electrodes Degradate Organic Pollutants,X703
  7. Heterogeneous Catalytic Ozonation Process for Advanced Treatment of Coal Chemical Wastewater,X784
  8. Synthesis of Rare Earth Double Perovskite-Type La2FeBO6（B=Mn、Co、Zn） Catalysts and Studies of Their Photocatalytic Degradation Properties,O643.36
  9. Isolation and Characterization of a Bacterial Strain Pseudomonas sp. CBW: Degradation Characteristics and Mechanism,S481.8
  10. Isolation and Degrading Characteristics of Avermectin Degrading Bacteria,S482.3
  11. Research of the Preparation and Propertirs of Biodegradable Starch-Based Loose-Fill Materials,TB34
  12. Effect of the pH Value on Photocatalytic Degradation of Phenol and Chlorophenol in Aqueous Solution,X703.1
  13. Study on Supercritical Water Oxidation of 4-chlorophenol and Advanced Treatment of Coking Wastewater,X703
  14. Study on Cometabolic Degradation of Chlorophenols by Pseudomonas Aeruginosa TBPY,X703
  15. Animal Experimental Study of Self-locking Cerclage Band Made of Poly-DL-lactic Acid Affect the None Weight-bearing Fractures,R687.3
  16. Study on the Treatment of Micro - Polluted Raw Water Xiangjiang River by O3 /biological Zeolite,X703
  17. Study on Degradation of P-Chlorophenol by Electrochemical Oxidation Using Boron-Doped Diamond Film Electrode,X703
  18. Preparation of Palladium Modified Nickel Foam Electrode and Its Application to Chlorophenols Compounds Electrocatalytic Hydrodechlorination in Aqueous Solutions,X703.1
  19. The Preparation of SnO2 Based Electrode and the Study of Degrading P-Chlorophenol,O614.432
  20. Studies on the Preparation and Performance of Starch Biodegradable Composite Films,TB383.2
  21. Effective Biodegradation of Polycyclic Aromatic Hydrocarbons (PAHs) and Population Diversity of Bacteria in the Contaminated Soil.,X53

CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
© 2012 www.DissertationTopic.Net  Mobile