Dissertation > Excellent graduate degree dissertation topics show

Studies on Removal of Heavy Metals(Cd(Ⅱ), Pb(Ⅱ) and Cr(Ⅵ)) from Micro-polluted Waters by Enhanced Coagulation

Author: ChenWeiLing
Tutor: LiMingYu
School: Jinan University
Course: Environmental Science
Keywords: Enhanced coagulation micro-polluted source water heavy metal Cadmium Lead Chromium
CLC: TU991.2
Type: Master's thesis
Year: 2009
Downloads: 376
Quote: 3
Read: Download Dissertation

Abstract


Our dinking water are mainly rivers,lakes and reservoirs.By means of monitoring and analysis,we know that these water have been polluted by some heavy metals.The study imitated water purification plants to carry on enhanced coagulation treatments on micro-polluted raw water,analyzing water quality parameters and full-scale experiment study including PFS、PAC、PFSS inorder to select the fittest coagulation for micro-polluted raw water.The removal of heavy metal Cadmium from micro-polluted waters by enhanced coagulation was studied using polyferric sulfate(PFS) as the coagulant.The effects of the pH, the dosage of PFS,the concentration of Cadmium ion and the turbidity of raw water on the Cadmium removal were investigated.The experimental results shown that,under the condition of the pH≥9,the residual concentration of Cadmium was lower than 0.005mg/L when the dosage of PFS is 3.75mg/L and the Cadmium concentration 0.1mg/L in water.When the concentration of Cadmium was higher than 0.1mg/L in water,Cadmium can also be removed under the condition of increasing the dosage of PFS.The removal of heavy metal Lead from micro-polluted waters by enhanced coagulation was studied using polyferric sulfate(PFS) as the coagulant.The effects of the pH,the dosage of PFS, the concentration of Lead ion and the turbidity of raw water on the Lead removal were investigated.The experimental results shown that,under the condition of pH＞6,the residual concentration of Lead was lower than 0.01mg/L when the dosage of PFS is 3.00mg/L and the Lead concentration 0.1mg/L in raw water.When the concentration of Lead was higher than 0.1mg/L in raw water,Lead can also be removed under the condition of increasing the dosage of PFS.The removal of heavy metal Chromium from micro-polluted waters by enhanced coagulation was studied using Polyferric Silicate Sulfate(PFSS) as the coagulant.The effects of the dosage of reductant and PFSS,the pH and the concentration of Chromium ion of raw water on the Chromium removal were investigated.The experimental results shown that,under the condition of the pH=7 and the dosage of reductant being theoretical value,the residual concentration of Chromium was lower than 0.05mg/L when the dosage of PFSS is 0.75mg/L and the Chromium concentration 0.865mg/L in water.When the concentration of Chromium was higher then 0.865mg/L in water,Chromium can also be removed under the condition of increasing the dosage of PFSS.By comparing the tests of the coagulants of PAC,PFS and PFSS,we can see that in the same dosage,PFSS can make the residual concentration of heavy metal before filtration less than the other two agents.Therefore,the coagulation properties of PFSS is better than the other two.The effect of complex pollution on removal of heavy metal is little,but we should determine the dosage of coagulant according to water qualityThe experiment indicated that,enhanced coagulation is a way to enhance the output water.On the based routine treatment aechnique,enhanced coagulation is efficient way to treat the micro-polluted raw water.

Related Dissertations

  1. Research on Geological Features of Yinchanggou-Qiluogou Lead-Zinc Ore Deposit, Ningnan County, Sichuan Province,P618.4
  2. Preparation and Properties of Highly Active Dietary Fiber and Carboxymethylcellulose from Gracilaria Residue,TS254.9
  3. Study on the Accumulation and Remove of Cadmium and Lead in Oysters,X174
  4. Study of the Treatment of Printing and Dyeing Wastewater Using a Pilot-scale Combined Process of Multi-stage Anaerobic Phases and Cross Flow Aerobic Sludge Reactor,X791
  5. Treatment Bath Wastewater by Diatomite Enhanced Coagulation-Clothy Media Filter Process,X703
  6. Effects of Low Molecular Organic Acids on Immobilazition of Lead Ions by Nanosized Hydroxyapatite,S153
  7. The Comprehensive Evaluation of Flue-cured Tobacco Origin Place Environment and Tobacco Leaf of Fangxian,S572
  8. Theanalysis of Harmfulness Factors about Heavy Metals in the Course of Beef Cattle Feeding,S823
  9. Preparation and Properties of lead-free glass powder,TQ171.6
  10. Influence of Biochar Amendments on Decomposition of Soil Organic Carbon and Morphology of Heavy Metal in Red Paddy Soil,S153.6
  11. The Study of Socialist Core Value System Leading the Ideological Education of Farmers,D422.62
  12. The Study of Lead Exposure on Cyprinus Carpio Ovary Epithelial Cells,X174
  13. Cadmium, Chromium and Lead Accumlation, Distribution in Aralia Elata Var. Inermia and Their Effect on Leaf Antioxidative System,S792
  14. Responses of Alocasia macrorrhiza to Different Water Stresses and Pollutants Exposures,X52
  15. Study on Monitoring and Early Warning for Heavy Metal in Textiles,TS107
  16. Field In-Situ Remediation of Cu-Cd Polluted Soil by Amendments,X53
  17. Experimental Study on Heavy Metals Adsorption or Release from Sediments of East Dongting Lake,X524
  18. Cloning and Expression of Responsive Genes Related to Cadmium Stress in Radish (Raphanus sativus L.),S631.1
  19. Effect of Cadmium Stress and Sulfur Deficiency on Non-Protein Thiol Content and Glutathione S-Transferase Activity in Rice,S511
  20. Preparationandapplication of the Strong Alkali Anion Exchange Fiber Based the Polyethylene,TQ342.84
  21. Effects of Added Maize Straw and Citric Acid on Cu and Cd Availability in Soil,X131.3

CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment )
© 2012 www.DissertationTopic.Net  Mobile