Dissertation > Excellent graduate degree dissertation topics show

The Experimental Study of Modified Fenton Chemical Oxidation of Oil Contaminated Soils

Author: ZhengHongGui
Tutor: XuJinLan
School: Xi'an University of Architecture and Technology
Course: Municipal Engineering
Keywords: Modified Fenton reagent Oil concentration in-situ chemical oxidation Oil contaminated soils Soil organic matter
CLC: X53
Type: Master's thesis
Year: 2011
Downloads: 220
Quote: 1
Read: Download Dissertation

Abstract


Modified Fenton （MF） chemical oxidation does not need to change the pH value of soil, it can be repair oil contaminated soil in neutral condition and in situ, it is the most promising chemistry pre-oxidation technology. However, the MF chemical oxidation applies in different oil soil pollution intensity situation are rarely reports, especially the soil which the total petroleum hydrocarbon （TPH） concentration is more than 100 g/kg of heavy pollution almost hardly involved. This paper examines the MF oxidation of four different pollution intensity of petroleum contaminated soils and analyzes the oxidation of TPH and SOM; find the suitable scope of petroleum contaminated soil strength for MF chemical oxidation. And optimize the MF oxidation of oil contaminated soils, find the suitable MF chemical oxidation conditions of the subsequent bioremediation, this will provide the theory basis for repair of petroleum contaminated soil in the field. Test results shown as below:1. MF chemical oxidation of different concentration of oil contaminated soil（1） The oil concentration in polluted has important influence on modified Fenton chemical oxidation. The oil removal of low concentration contaminated soil is hgher than that of high concentration contaminated soil.（2） When the concentration of ferrous is 5.8mmol/L, and H2O2 concentration is 1100mmol/L, TPH removal efficiency of low concentration polluted soil （15g/kg 28g/kg） is 44.14% 45.77% while TPH removal efficiency of high concentration polluted soil （98g/kg 196g/kg） is only 5.35% 7.06%. The results indicated that is feasible for low polluted level to be oxidized by MF reagent.（3） Compare two addition methods of H2O2, the results indicated the TPH removal efficiency by graded MF is double of conventional addition mehod, and removal efficiency of SOM decreased to17%, it is a better addition of H2O2.2. Optimum of MF chemical oxidation of petroleum contaminated soils（1） The best molar rate of H2O2 / Fe is 1100/5.8, under this condition the TPH oxidation efficiency is 45.77% and SOM removal efficiency is 10.65%. When H2O2 concentration keep the same, the oxidation efficiency of TPH is twice times under 5.8 mmol/L of Fe2+ condition of 2.9 mmol/L. Optimal addition time of oxidant is 3 times, the TPH concentration from 26540mg/kg drop to 12812mg/kg, TPH oxidation rate reaches as high as 51.73%, SOM oxidation rate is low, only 6.62%. The amount of oxidant is fixed; SOM removal efficiency and TPH removal efficiency change trend is opposite, TPH are competitive relationship with SOM in soil.（2） Test found that the treatment effect in 8.5 pH value is superior to the pH of 3.5, TPH oxidation efficiency is increased to 1020 percentage points, it proved that under the neutral pH condition, soil petroleum hydrocarbons was more easily oxidation by MF reagent.3.Combined process of MF chemical oxidation with bioremediation of oil contaminated soilAfter MF oxidation under optimal condition, bioremediation tests were carried out under inoculation and ono-vaccinated condition. The data shows that the TPH removal efficiency of two groups are 54.64% and 47.72%. MF reagent chemical oxidation will not reduce microbial activity in soil, but also can improve the subsequent bioremediation.

Related Dissertations

  1. Research on the Quility of Pear and Soil Physical and Chemical Properties in Crop-Animal Mixed Orchard,S661.2
  2. Effects of Soil Organic Matter on Soil Fertility and Anti-erodibility in Karst Area,S153.62
  3. Study on Characteristics of Soil Structure for the Water Level-fluctuating Zone in Three Gorges Reservoir Area,S152
  4. Study on Dynamic Relationship between Labile Soil Organic C, N and Crop Growth under Straw Incorporation,S158
  5. Changes in Soil Properties and Its Relation with Soil Productivity under Long-Term Fertlization in Paddy Fields,S158
  6. Identification of QTL for Kernel Oil Content and Analysis of Related Traits in Maize,S513
  7. Pesticide Transport and Enrichment in Water-Soil Environment,X132
  8. Study on Synthesis of Titania Nanofilms Via in Situ Chemical Oxidation and Their Photocatalytic Degradation Performance,X70
  9. Molecular forms of heavy metals contaminated soil and rhizosphere transformation mechanism,X53
  10. Effects on Soil Anti-erodibility and Soil Organic Matter Frations in Slope Farmlands with Different De-farming Patterns in South Sichuan Province of China,S157.1
  11. Studies on the Retrieval of Soil Organic Matter and Total Iron Content from Hyper-Spectrum Based on ANN,TP79
  12. Study on the Water Erosion under 5 Years Conservation Tillage System in Loess Plateau,S157
  13. Study on the Characteristics of Soil Organic Matter of Alpine Meadow under Different Degradation Degrees in Eastern Qilian Mountains and Its Effect on Productivity,S812.2
  14. A Comparative Study of paddy soils and upland soil enzyme activity and organic matter in the FT - IR characteristics,S158
  15. Loess Plateau farmland vegetation root distribution characteristics and environmental response,Q948
  16. Studies on Effect of Agronomic Management Practices on Organic Fertilization of Sandy Soil,S158
  17. Utilization of forest ecosystem carbon cycle model simulations integrated dynamics of soil organic carbon,S718.5
  18. The Effect of Alternative Freezing and Thawing on Soil Organic Matter and Nitrogen Potassium Nutrition of Black Soil,S153
  19. Accumulation of Soil Organic Matter and Influential Factors on the North Slope of Changbai Mountain,S714
  20. Soil Organic Matter and Wheat Straw Decomposition and Simulation under Different Temperature and Moisture Condition,S158
  21. Soil Ecological Properties in an Arid Area of West of China,S159

CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
© 2012 www.DissertationTopic.Net  Mobile