Dissertation > Excellent graduate degree dissertation topics show

Bioremediation of Eutrophic Lake Water by Immobilized Bacteria-algae Microspheres

Author: ZhengPei
Tutor: TangYuBin
School: Jiangsu University of Science and Technology
Course: Applied Chemistry
Keywords: algae-bacteria symbiotic system immobilization orthogonal test eutrophiclake remediation of lake water
CLC: X173
Type: Master's thesis
Year: 2013
Downloads: 5
Quote: 0
Read: Download Dissertation

Abstract


The removal efficiencies of total nitrogen(TN), total phosphorus(TP) and chemicaloxygen demand (COD) in the simulated Lake water by chlorella, scenedesmus, microcysticaeruginosa and synechococcus were inspected to choose the dominant algae species. Theeffects of initial cell densities of dominant algae on removal rate of total nitrogen, totalphosphorus and chemical oxygen demand were studied. Furthermore, the algae-bacteriasymbiotic system was made up of the dominant species and actived sludge, and the bestmicrobial ratio was also studied. The preparation conditions of algae-bacteriaco-immobilized microspheres were optimized using orthogonal test, and the beads preparedunder optimized conditions were characterized. The removal efficiencies of TN, TP andCOD in the simulated Lake water by suspended algae, immobilized algae, immobilizedactived sludge as well as co-immobilized algae-bacteria were compared, and theremediation efficiency of Zhenjiang Jinshan lake water by co-immobilized algal-bacterialbeads was investigated.The results show that Chlorella was the bominant specie, and achieved the highestremoval efficiency of TN, TP and COD with initial cell density of5×106/mL. The optimumratio of algae to sludge within algae-bacteria symbiotic system is determined as1:2.The orthogonal test results demonstrated that the optimum conditions for preparation ofimmobilized algal-bacterial beads are: the amount of PVA was10%(m/v), microorganismembedding capacity was15mL, sodium alginate was0.6%(m/v), calcium chlorideconcentration2%(m/v).The characterization results prove that the prepared beads have larger specific surfacearea and appear internal reticular structure, their pore size distribution are uniform,mesopore accounts for the majority, are suitable for the growth of Chlorella andmicroorganisms.The results showed that the removal efficiencies of algae-bacteria co-immobilizedmicrospheres on TN and COD is obviously higher than that of immobilized algae,suspended algae and immobilized actived sludge, but suspended algae shows slightadvantage over algae-bacteria co-immobilized microspheres on the removal of TP.The algal-bacteria co-immobilized beads can effectively remedy polluted Jinshan Lakewater. The beads can be used repeatedly3~4cycle, in the first4cycles, each cycle lasted for 96h, the average TN removal rate was above80%; the average TP removal rate was above90%; the average COD removal rate reached more than85%, showed that the immobilizedbacteria-algae beads have potential application value in the remediation of eutrophic lakewater.

Related Dissertations

  1. Powered Activited Carbon-UF for Treating Micro-polluted Surface Water,X703
  2. Penicillium Expansum TS414 Lipase in Pichia Pastori: Expression, Purification and Enantioselective Esterification of (R, S)-naproxen,Q814
  3. The Research on Immobilization of β-galactosidase and Production Technology of Low Lactose Milk,TS252.4
  4. Effects of Low Molecular Organic Acids on Immobilazition of Lead Ions by Nanosized Hydroxyapatite,S153
  5. The Research of Synthesis of Bisphenol-A Polycarbonate Through Melt Transesterification Process,TQ323.41
  6. Applied Research of Emulsified Fuel on S195 Diesel Engine,TE626.24
  7. Extraction of the Lipase from Pseudomonas Cepacia S31 and Its Applications in Food,TS201.25
  8. The Research on the Microwave Stability of Selenium-Enriched Rich Bram,TS210.9
  9. Investigation of Plasma Sprayed NiCr-Cr3C2 Coating on Mould CrZrCu Alloy Plates,TG174.442
  10. Functional Br (?) Nsted acidic ionic liquid catalytic synthesis of cyclic carbonate reactivity,O643.32
  11. Prodction, Purification and Immobilization of a Thermoalkaliphilic Catalase from Thermoascus Aurantiacus,TQ925
  12. Experimental Study on Extracting Humic Acid from Huolinhe Lignite,S141
  13. Long residual herbicide mesotrione degradation BACTERIA and Degradation Characteristics,X172
  14. Lead and zinc smelting slag sulfur pollution acid system fixed / stabilization of,X705
  15. Study of the Thermoplastic Fiber Hybrid Textile Composites,TB332
  16. Preparation of Chitosan Magnetic Microsphere and the Application to Enzyme Immobilization,O631.3
  17. Pt/C Catalysts for Hydrogen Evolution from Decalin under Microwave Heating,O621.25
  18. Preparation of New Immobilized Lipase and Its Transesterification Activity,Q814.2
  19. Production, Characterization and Application of Recombinant Staphylococcal Protein A,Q936
  20. Study of Immobilized Enzyme Based on Magnetic Nanoparticles,Q814.2
  21. Preparation of Polymer GMA-IDA-grafed Magnetic Microsphere and Its Immobilization of Tyrosinase,O631.3

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