Dissertation > Excellent graduate degree dissertation topics show

Research on Removal Characteristics of Pollutants in Slightly Polluted Water by Constructed Wetland System

Author: ZengYongGang
Tutor: LiJuan
School: Chongqing University
Course: Environmental Engineering
Keywords: Constructed wetlands Micro - polluted water Filler Plant roots activity Soil enzymes
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 250
Quote: 1
Read: Download Dissertation

Abstract


Currently, many of our rivers are micro-contamination exists, micro-polluted water bodies involving a wide range, the mechanism is very complex and the subsequent problems of water environment physical chemical remediation technology is more expensive, has not yet cost-effective control technology. Constructed wetlands with good treatment effect significant ecological benefits, lower investment and operating costs, etc., repair micro-polluted water bodies will play an increasingly important role. Focused on artificial wetlands at the start and stable stage removal of conventional pollutants studied to explore its packing static and dynamic adsorption pollutant characteristics, analysis of different plant wetland removal rate difference and its plant root activity measured wetland rhizosphere soil enzyme activity in wetlands. The conclusions were as follows: artificial wetlands of COD, TN, TP month average removal rate range from 11.7% to 25.2%, from 5.3% to 38.2%, from 33.3% to 61.6%; correlation of the influent pollutant loads its influent concentration analysis found a positive correlation between the influent COD, TN, TP loads are influent concentration, the COD load each wetland effluent concentration more significant, correlation between TN, TP load and effluent concentrations not significant. The correlation analysis found that the oxygen consumption rate and pollutant removal rate limiting factor for micro-polluted water, dissolved oxygen is not artificial wetland pollutant removal. The concentration of chloride ions run a significant performance impact on wetlands, but when chloride ions return to normal after wet run performance gradually restored. Removal rate from the filler on the wetland, wetlands construction waste pollutant removal rate is relatively high; removal rate from the start-up phase and stabilization phase analysis filler for construction waste wet start-up phase and stabilization phase differences are significant. Fillers static assay and dynamic assay Static adsorption: different temperatures, the temperature rises, waste bricks, pebbles, gravel three fillers on the adsorption of nitrogen and phosphorus increases, but the increase in nitrogen and phosphorus adsorption capacity was The increase in the amount of different, pebbles and gravel basic or less, increase the amount of waste brick is slightly smaller than the first two. 25 ° C test data fit the Langmuir equation is found to be better than the Freundlich equation fitting filler adsorption data of ammonia For data packing adsorbed phosphorus, just the opposite, packing volume of theoretical saturation adsorption of nitrogen and phosphorus as waste brick, gravel, followed by the smallest pebble. Dynamic assay in a concentration to reach equilibrium concentration increases, an adsorption equilibrium will break until the rebalance. Residence time on the adsorption of nitrogen and phosphorous. Wetland pollutant removal analysis from plants found Arundo donax wetland for pollutant removal compared to the Canna and rushes wet high; influent loading and effluent concentrations found in the start-up phase and the stabilization phase, in some influent load under the start-up phase of COD and TN removal rate is greater than the stabilization phase. Activity was measured on the plant's root system than the cold season, warm season plant roots activity, canna roots Arundo donax and rush of activity than root root activity. Warm season plant roots activity of pollutant removal, the stronger the root activity, the higher the operating efficiency of the wetlands, but the cold season plant roots influence warm season weakened pollutant removal. Artificial wetland rhizosphere soil enzyme activity study found: artificial wetland rhizosphere soil enzyme activity resistance changes with the seasons, May dehydrogenase activity in the highest, and then gradually decreased; hydrogen peroxide enzyme in July, August and December enzyme activity sex is relatively low; urease monthly fluctuations, through T test found significant differences planting different plants, soil dehydrogenase, and catalase and urease significant differences do not exist; wetland soil enzyme activities along gradually reduced . The correlation analysis showed that soil enzyme activities are positively correlated with pollutant removal through soil enzyme activity and pollutant removal rate, but the the various wetlands correlation significantly different degrees.

Related Dissertations

  1. Investigation on Microstructure and Properties of Cadmium-Free Silver-Based Intermediate Temperature Filler Metals,TG425.2
  2. Effect of Limestone Powder on Properties of Concrete Mixture,TU528
  3. Development and Application of Insulation-Colling Coating for Outdoor Textile,TQ630.7
  4. Heat Resistance and Thermal Conductivity Behavior of Modified Unsaturated Polyester Insulating Varnish,TQ633
  5. Study on Fiber Laser Welding of Aluminum Alloy with Filler Wire,TG456.7
  6. Guide lithium polymer electrolyte membrane preparation and application,TB383.2
  7. Experimental Study Saline Subbase with Calcium Carbide Dust,U412.22
  8. Fabrication and Characterization of Highly Porous SiOC Ceramics from Silicone Resin,TQ174.1
  9. Study on the Standards of Subgrade Filler of Hengda Highway,U414
  10. High - speed railway roadbed filler Experimental Study on Improving,U214
  11. Inactivation of Virus in Drinking Water by Three Chlorine-Containing Disinfectants and Its Pseudo-Kinetics,R123.1
  12. Biofilter treatment of slightly polluted source water study,X52
  13. Study on Dephosphorization and Purification Technology in the Micro-polluted Water,X703
  14. Study on Municipal Sewage Treatment by Filler Dosed Enhanced Sedimentation Process,X703.1
  15. Study on Municipal Wastewater Treatment Technology for Further Nitrogen and Phosphorus Removal Basing on Composite Ferric Enzymatic and Composite Filler Biofilm,X703.1
  16. Microstructures and Properties of Brazing Joint of Al2O3 Ceramic and Q235 Steel,TG407
  17. Formulation Design and Performance Studies on Silicate Heat-insulating Coating,TQ630.7
  18. Study on Brazing Process and Mechanism of Si3N4 Ceramic Joint Brazed by Au-Ni-V-Pd High-temperature Filler Alloy,TQ174.6
  19. Mechanism Study of the Air Discharge Scarcity of the Piston Air Compressors in the Coal Desulfurizing Plant and the Alteration Measures,TH45
  20. Effects of Root Exudates and Extracts on Growth of Processing Tomato and Activities of Soil Enzymes,S641.2
  21. Study on Biological Effect of Controlling Cotton Virticillium Wilt with Antagonistic Bacillus and Bio-organic Fertilizer,S435.62

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