Dissertation > Excellent graduate degree dissertation topics show

Treatment of Nitrate-contaminated Water Using Sulfur-based Autotrophic Denitrification Combined with Bac (Biological Activated Carbon) System

Author: WangZuo
Tutor: ZhouWeiLi
School: Shanghai Jiaotong University
Course: Environmental Engineering
Keywords: Sulfur autotrophic denitrification Biological activated carbon Nitrate nitrogen Heterotrophic denitrification
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 22
Quote: 0
Read: Download Dissertation

Abstract


Eutrophication and groundwater nitrate nitrogen pollution worldwide more and more serious, denitrification has become an important step to improve water quality, and denitrification as the final step of denitrification, but also of great significance. Relative to the traditional differences denitrification possible shortcomings of secondary pollution caused by sulfur autotrophic denitrification advantage of no external carbon source to become a research focus in recent years. However, the sulfur autotrophic denitrifying bacteria growth cycle and sensitive to changes in the external environment, resulting in lower efficiency of denitrification. In order to improve the sulfur autotrophic denitrification rate in this paper using UASB reactor, activated carbon as sulfur autotrophic anti nitrifying bacteria growth and reproduction carrier, the formation of biological activated carbon (BAC) system for the removal of NO 3 the - -N made the following conclusions and results: The system in the influent NO 3 - -N concentration of 10 1 00mg / L, hydraulic retention time (HRT, hydraulic retention time) 0.67 4 h the range, you can get the the above NO 90% 3 - -N removal rate and more than 80% of the TN removal rate, the maximum influent NO 3 - -N load (NLR , nitrogen loading rate) for 1.12kgN / m 3 ยท d minimum HRT of 0.67h, the best denitrification concentration 40 mg / L, the water basically no the of NO 2 - -N accumulation. 76 days of operating results contrast the BAC system 148 days of running with the ordinary anaerobic sludge BAC higher nitrogen removal system, the shorter residence time, more secure and stable operation effect. Processing organic matter containing low concentrations of NO 3 - -N wastewater feasibility BAC system, add a low concentration of COD in the influent to simulate the actual water quality test results found that, the low COD add nitrogen removal of the whole system basically no impact, and promote the growth of some heterotrophic denitrifying bacteria sulfur autotrophic denitrification denitrification load sharing to some extent. Experiments show that the influent S / N is reduced to 0.7, affects neither the denitrification effect, but also reduce the concentration of sulphate in water, indicating that the BAC system combined with sulfur autotrophic denitrification applicable to the actual body of water. Reaction at all stages of the process of mud-like SEM observation and analysis of molecular biology experiments, cultured in this experiment the sulfur autotrophic denitrifying bacteria as a Brevibacterium mass adsorbed on the activated carbon surface is not yet found in the gene pool its similarity greater than 60% of the known bacterial gene fragment and lower traditional Thiobacillus denitrificans affinity. Using real-time quantitative PCR to examine the growth of denitrifying bacteria in the running of the whole culture and the outside world for its impact, the results show: denitrifiers sludge concentration declined by domestication, then gradually increased in the run. Domesticated eliminated most different denitrifying bacteria, sulfur autotrophic denitrifying bacteria in the running process of gradual growth, and to play a leading role in the system. BAC system, granular activated carbon (GAC) has played the role of bioconcentration and biological carrier, sulfur autotrophic denitrifying bacteria with a small number of heterotrophic denitrifying bacteria complementary, and eventually the system to achieve high efficiency and low consumption of nitrogen removal.

Related Dissertations

  1. Test of Advanced Wastewater Treatment by Hydrogen Peroxide,activated Carbon,zeolite Different Combination Processes,X703
  2. Study on Oil Field Produced Wastewater by Ozone Oxidation Treatment,X703.1
  3. Research on the Treatment of Antibiotics Pharmaceutical Wastewater,X703
  4. Research of the Capacity of Municipal Wastewater Treatment Plant Receiving the Cassava Alcohol Wastewater of Anaerobic and Aerobic Treated,X703
  5. Uptake of Dissolved Inorganic Nitrogen by Microalgae in the Shrimp Pond,S917.3
  6. The Accumulation of Nitrate Nitrogen in Soil Profiles in the Semiarid and Semi Humid Area,S158
  7. The Anaerobic Ammonium Oxidation Process,X703.1
  8. The Treatment of Bromoamine Acid Wastewater by the Combined ILAR-BAC Process,X703
  9. The Application of Immersion Combined Membrane Process for Drinking Water Treatment,TU991.2
  10. The Study on the Modified Denitrifying Filter in Advanced Wastewater Treatment,X703.1
  11. The Analyses Towards the Content of Nitrogen in the Polluted Soil in Tong Liao and the Study on the Move as Well as the Transformation,X132
  12. Brackish water drip on the southern specialty fruit root zone soil organic carbon and nitrogen components affect research,S66
  13. Study on Advanced Treatment of Yarn Dyeing Wastewater by Aerated Bological Activated Carbon Filter,X703
  14. Experimental Research on Advanced Treatment and Disinfection Process of the Drinking Water Integrative Equipment,TU991.2
  15. Removal of Nitrate by Electochemical Method,X703
  16. Research on the Technology of Filtering and Adsorption in Reclaimed Water Reuse,X703.1
  17. Laboratory, Pilot and Full Scale Investigations of Catalytic Ozonation for Upgrading Drinking Water Quality,TU991.2
  18. Effects of Different Water Stress and Nitrogen Forms on the Growth and Nitrogen Uptake of Different Genotypes Rice and Its Physiological Mechanism,S511
  19. Study on Production of Biological Activated Carbon from Orange Peel and Landfill Leachate Subsequent Treatment Techlonogy,X703
  20. Research on the Removal of Nitrate from Groundwater by Biological Electrode Denitrification,TU991.2

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