Dissertation > Excellent graduate degree dissertation topics show

Absorption Characteristics of N and P in Water by Hydrophytes and Its Application of Ecological Ditch

Author: XuXiuLing
Tutor: CaoLinKui
School: Shanghai Jiaotong University
Course: Pesticides
Keywords: paddy aquatic plant water ecological ditch nitrogen phosphorus
CLC: X173
Type: Master's thesis
Year: 2012
Downloads: 303
Quote: 0
Read: Download Dissertation

Abstract


In the present paper, we chose kinds of aquatic plants as the research object which are common in Shanghai area. Through indoor static simulation and outdoor cement pool district experiment, the nitrogen and phosphorus uptake characteristics by different aquatic plants were studied. Furthermore, a special ecological ditch were designed and constructed, and the removal capacity of nitrogen and phosphorus by aquatic plants in the ditch were discussed . The results were as follows:(1) Through indoor static simulation experiments, nitrogen and phosphorus removal capacity in water of four kinds of aquatic plant, namely Acorus calamus, Eichhornia crassipes, Cyperus alternifolius and Arundo donax var. versicolor were compared. The results showed that there were significant differences in the removal efficiency. The total nitrogen removal rate were: C. alternifolius(77.4%)>E. crassipes(75.6%)>A. calamus(70.2%)>A. donax var. versicolor(57.3%); total phosphorus removal rate were: E. crassipe(s45.0%)>A. calamu(s38.50%)>C. alternifoliu(s34.0%)> A. donax var. versicolor(30.50%). The amounts of nitrogen absorbed by plants were: C. alternifolius > E. crassipes > A. calamus > A. donax var. versicolor; The amounts of phosphorus absorbed by plants were :E. crassipes > A. calamus> C. alternifolius> A. donax var. versicolor; contribution rate of nitrogen absorbed by plants were:E. crassipe(s57.5%)> C. alternifolius(47.7%)> A. calamus(33.7%)> A. donax var. versicolor(27.6%),contribution rate of phosphorus absorbed by plants were:C. alternifolius(58.9%)> A. calamus(57.2%)> E. crassipes(55.5%)> A. donax var. versicolor(45.0%).(2) Through outdoor cement pool district experiment, three kinds of aquatic plants, namely A. calamus, Typha orientalis and Iris tectorum were grown under three different nitrogen and phosphorus concentration of water, and their purification effect were compared. The results showed I. tectorum and T. orientalis could grow normally in three kinds of water, while the growth of A. calamus was affected by high nitrogen and phosphorus concentration of water. There were significant differences in the N and P removal efficiency. For example, in three different nitrogen and phosphorus concentration of water, the total nitrogen removal rate of I. tectorum were 69.0%,88.8%,69.9% respectively, with average removal rate 75.9%; A. calamus were 66.5%,82.2%,54.2%, with average removal rate was 67.6%; T. orientalis were 64.1%,77.0%,74.3%, with average removal rate 78.4%; total phosphorus removal rate of three kinds water: I. tectorum were 70.0%,87.7%,77.5%, with average removal rate 78.4%; A. calamus were 54.0%,80%,55.8%, with average removal rate 63.3%;T. orientalis were 44.0%,60.5%,61.6%, with average removal rate 55.4%. The result showed total nitrogen removal efficiency is: I. tectorum > T. orientalis > A. calamus; total phosphorus removal efficiency is: I. tectorum> A. calamus> T.orientalis .When aquatic plants were grown in water with low concentration of nitrogen and phosphorus, the nitrogen content of A. calamus and I. tectorum increased more. In water with moderate and high concentration of nitrogen and phosphorus , nitrogen content of I. tectorum increased most. Phosphorus content of three plants were significantly different, Phosphorus content of per plant were: I. tectorum > T. orientalis > A. calamus,in water with three concentrations of nitrogen and phosphorus, I. tectorum absorpted phosphorus mostly .(3)Through collocation planting aquatic plants, built rice fields system ecological ditch. Through monitoring the change of nitrogen and phosphorus in runoff water after rainfall four times, the interception rates of nitrogen and phosphorus by ecological ditch were observed. The results showed that the average interception rate of ammonium and nitrate nitrogen were 50.8% and 44.7% respectively, and the average interception rate of total nitrogen and phosphorus were 45.1% and 30.2% respectively. Concludingly, the nitrogen and phosphorus interception rate of the ditch is more than 30%.

Related Dissertations

  1. Preparation and Performance of Molecular Imprinted Polymers for Rhodamine-B and Rhodamine-6G,O631.3
  2. Experimental Research on Influence of Coal Reburning Reaction Conditions on NO_x Reduction by Non-Catalytic Reduction of Ammonia,X701
  3. Temporal and Spatial Variation of Methane Emission from Urban Lake and Its Relationship with the Hydrology-water Quality,X524
  4. The Research of Ecological Compensation on the Restoration of Water Quantity in the Man-Made Seasonal Rivers,X143
  5. Phosphorus pentoxide composite ammoniated condensing agent preparation of ammonium polyphosphate,TQ314.248
  6. Lake Sediment Accumulation Areas of Yunnan Altiplano Ecological Conditions of Phosphorus and Nitrogen Interactions,X131.2
  7. Studies on the Drying Modle and Technology of Tilapia by Heat Pump,TS254.4
  8. Cultivation and Effects of Environmental Factors on Carrying WSSV Virus of Litopenaeus Vannamei,S945
  9. Clinical study of Xu heart,such as academic thought and clinical experience and Yiqi Huoxue,Xiefei Diuresis treatment,congestive heart failure,R259
  10. Capsaicin / β - cyclodextrin system to dissolve and penetrate the,R943
  11. Effects of Intensitive Cycling of Papermaking Water on Sizing and Its Improvement,TS727.5
  12. Study on Application of Non-phosphate Additive in Frozen Penaeus Vannamei and Mechanism of Water-holding,TS254.4
  13. Regional Water Environment Pressure Zoning Based on GIS,X321
  14. Cryopreservation and Transportation for Portunus Pelagicus, Soft Shell Crab and Spawning Crab,S968.252
  15. Effects of Light, Temperature and Nitrogen on the Growth of Three Kinds of Aquatic Plants,Q945
  16. Yellow phosphorus storage tank area of Safety Evaluation,TQ126.317
  17. Design, Synthesis and Antitumor Activities Study of Quinoxaline-1,4-dioxide Derivatives,R914
  18. Water-mdeiated Ablation of Hard Biotissue with Pulse Lases,R318.51
  19. Synthesis and Application of A Novel Series of Cation Hydrophobically Modified Polyacrylamide,TQ323.6
  20. Optimization Design Andapplication of Extracting Methods of Maize (Zea Mays L.) Volatile Compounds,S513
  21. Nitrogen Regulation and Management on High-yield Wheat-maize Rotation System,S512.1

CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Biology > Environmental botany
© 2012 www.DissertationTopic.Net  Mobile