synthesis of fly ash based zeolite for wastewater purification

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synthesis of fly ash based zeolite for wastewater purification

  1. 1. Development of a Novel fly ash based Zeolite for treatment of Waste Water By Vinit Sehgal, B.E. Student, Department of Civil Engineering, BIT-Mesra, Ranchi
  2. 2. 66% 26% 3% 5% Thermal Hydel Nuclear RES Energy status in India Source:Ministry of power, 2009 www.powermin.nic.in
  3. 3. Preparation of a novel fly ash based zeolite for treatment of waste water
  4. 4.  Synthesis of Zeolites & Process Optimization  Zeolite Characterization  Efficiency testing for Cation removal by Ion exchange  Anion removal by Surface Modification  Incorporation of disinfecting agents  Efficiency Testing
  5. 5. Role of Zeolites?? Zeolites are microporous aluminosilicates of the general formula Mx/n [(AlO2)x (SiO2)y].z H2O where n is the charge of the metal cation, M n+. M is usually Na+, K+ or Ca2+ and z is the number of moles of water of hydration, which is highly variable. In this framework, some of the silicon atoms are replaced by aluminium atoms. Zeolites are found in nature and they are also synthesized for catalytic selectivity. Because of the three dimensional cage like structure, zeolites can be used as ion- exchange materials and selective adsorbents. Zeolite can be regenerated using a salt solution which provides a high concentration of sodium ions to reverse the exchange reaction. In this case hardness is released as a concentrated chloride Ca X or Mg X +2NaCl→Na2X + CaCl2 or MgCl2 Ca Mg SO4 2- 2Cl- 2HCO3 - Na2 Z Z Ca Mg Na2SO4 2NaCl 2NaHCO3 2+
  6. 6.  Adsorption( Molecular Sieves)  Ion Exchange CaCl2 + Na2Z CaZ+ 2NaCl MgCl + Na2Z MgZ +2NaCl CaSO4 +Na2Z CaZ + Na2SO4 Mg2SO4 + Na2Z MgZ + Na2SO4 Ca(HCO3)2 Na2Z CaZ + 2NaHCO3 Mg(HCO3) + Na2Z MgZ + 2NaHCO3
  7. 7. Zeolite Synthesis from Fly Ash Conventional Hydrothermal Treatment Fusion Membrane Extraction Microwave Pre-Treatment FA+NaOH/KOH Zeolite 50% Conversion FA+ NaOH Pellets Sodium Silicate Dissolve in Alkaline Solution Hydrothermal Treatment 50% Conversion Silicone Extraction Fusion Hydrothermal Treatment with addition of Alumninate Solution High Purity 5500 c Reflux & Stirring FA+ 2M NaOH Microwave Heating for 2 hrs Hydrothermal Treatment Centrifugation Drying & Crystallization
  8. 8.  Alkali source: NaOH/KOH  FA slurry with Solid:liquid ratio=140gm:350ml.  Refluxed for 98hrs under strong agitation and at 383 K temp. till the pH becomes neutral
  9. 9.  Combination of Conventional and microwave synthesis  Increase in Porosity and hence high CEC values  Better Quality of Zeolites
  10. 10.  High CEC  pH control  Effect of Time, Temp and Base  Process Optimization
  11. 11. 0.0 0.2 0.4 0.6 0.8 1.0 1.2 25 30 35 40 45 50 55 Turbity Concentration(gm/800 ml) B
  12. 12. 450 500 550 600 650 0.2 0.4 0.6 0.8 1.0 Wastewater Zeolite treated water( ) Absorbance(w.r.tdistilwater) Wavelength (nm)
  13. 13. Dosage Fe(III) concentration % removal 0% 0.8ppm __________ 0.025% 0.2ppm 75% 0.037% BDL 100% 0.050% BDL 100% 0.062% BDL 100%
  14. 14. Thank you……

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