Dissertation > Excellent graduate degree dissertation topics show

Air-stripping and Reduction for the Simulated Treatment of the Groundwater Polluted by Chlorinated Aliphatics Hydrocarbons at Contaminated Sites

Author: LiLi
Tutor: ZhangWei；LinKuangFei
School: East China University of Science and Technology
Course: Environmental Science and Engineering
Keywords: Comtaminated sites groudwater Chlorinated hydrocarbons Sieve plate tower Commercial iron power Reduction dechlorination
CLC: X523
Type: Master's thesis
Year: 2012
Downloads: 90
Quote: 0
Read: Download Dissertation

Abstract


Chlorinated aliphatics hydrocarbons (CAHs) as good organic solvent are widely used in industry. Now many groundwater pollution sites are badly polluted due to improper handling of chlorinated hydrocarbon solvents, which results in a serious threat to human health and ecological security. Due to soil and groundwater contamination in Brownfield, the redevelopment of contaminated Brownfield may often pose health risk to public. So it is particularly important to remove the chlorinated hydrocarbons in groundwater.Air stripping in sieve plate tower for the treatment of the water polluted by CAHs and researching on reduction effect of CAHs by Fe/C/Cu were studied, which have important theoretical significance to carry on the research of the Brownfields. The results are as follows:(1) The various air-stripping services such as graduated cylinder, bubble column (batch), bubble column (continuous) and sieve plate tower were choosen in the study. High removal efficiency in a graduated cylinder demonstrated that air-stripping is available for reduction of CAHs. The removal efficiency in sieve plate tower is the highest.(2) Air stripping in sieve plate tower for the treatment of the water polluted by CAHs such as perchloroethylene(PCE) and trichloroethylene(TCE) were studied.①After air stripping, PCE concentration declined from 25.68 mg/L to 0.62 mg/L, and removal rate amounted to 97.59%; Gas-liquid ratio affected PCE removal rate obviously and the optimum gas-liquid ratio was around 250; Initial concentration influenced the removal effect slightly; Waste water was better treated by 4 plates column; Experimental data followed one-order decay model very well.②CE concentration declined from 97.32 mg/L to 2.794 mg/L, and removal rate amounted to 97.13%; Gas-liquid ratio affected TCE removal rate obviously and the optimum gas-liquid ratio was around 230; Initial concentration influenced the removal effect slightly; Waste water was better treated by 6 plates column; Experimental data also followed one-order decay model very well.(3) The reductants such as Fe, Fe/Cu and Fe/C/Cu were compared in this study. The removal of CAHs was not obvious in the Fe and Fe/Cu systems, while the greatest reduction efficiency was achieved by Fe/Cu/C system, as a result of synergetic effect of microelectrode of Fe/Cu and Fe/C. Neutral condition was appropriate for CAHs degradation, and acidic system favored slightly CAHs dechlorination compared with alkaline system. Then we observed some transformation of CAHs in neutral system, as evidenced by the presence of reaction products.

Related Dissertations

  1. Microbial Degradation of Typical Chlorinated Hydrocarbons Pollutants in Second Songhua River,X522
  2. Study on Chlorinated Liquid Waste Oxidation at High Temperature,X70
  3. Study on Simultaneous Effects of Anodic-cathodic Electrochemical Degradtion for Organic Pollutants,X703
  4. Health Risk Assessment of a Brownfield Contaminated by Volatile Chlorinated Hydrocarbons and Study on Screening of Remediation Technique,X820.4
  5. Study on Volatile Chlorinated Hydrocarbons in Groundwater Using the Permeable Reactive Barrier of Zero Valence Iron,X523
  6. Study on Shallow Groundwater Contaminated by Organic Chemicals in the Suburb of a City,X523
  7. Mensuration and Prediction of Rate Constant for Dechlorination of Chlorinated Hydrocarbons,X132
  8. Rapid detection of volatile chlorinated hydrocarbon contamination in the soil and groundwater,X832
  9. Adsorption - desorption characteristics of volatile chlorinated hydrocarbons in typical soils of China,X131.3
  10. A Basic Study on Preparation Method of Nano Fe/Ni Bimetallic Particles and Its Removal Capacity for CAHs from Water,X523
  11. The Study of O3.Mn-Fe/Silica Gel Carrier in the Catalytic Oxidation of Organic Pollutants in Groundwater,X523
  12. Electrochemical Generation of H2 for Catalytic Hydrodechlorination of Chlorinated Organic Compounds in Groundwater,X523
  13. Study on the Treatment of Nitrate Polluted Groundwater by Using a Novel Denitrifying Bacterium,X523
  14. Spatial Variability and Distribution Pattern of Groundwater Nitrate Pollution in Farming Regions of Shandong Province,X523
  15. Catalytic Reduction of Nitrate in Groundwater Over Pd-Cu/AC Catalyst,X523
  16. Study of the Impact on Groundwater Environmental about Shijiazhuang Refinery Upgrade Project,X523
  17. Investigation of Organic Pollution Impact on Groundwater During Mine-filling Process with Gangues,X523
  18. Study on the Damage Mechanism of Coal Mining on Groundwater Resources and Its Protection Countermeasures,X523
  19. The Residua of Oil Pollutants and Its Hydrodynamic Effects on Porous Medium,X523
  20. Study on Nitrogen Leaching and Groundwater Pollution in the Farmland of Weishan Irrigated District,X523
  21. Characteristics and Influencing Factors of Nitrogen Loss in Guancun Karst Subterranean River Catchment,X523
  22. Pollution of groundwater and groundwater pollution prevention law perfect,X523

CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > Groundwater
© 2012 www.DissertationTopic.Net  Mobile