synthesis of fly ash based zeolite for wastewater purification
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
6. Preparation of a novel fly ash
based zeolite for treatment of
waste water
7. 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
8.
9. 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+
12. 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
13. 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
14. Combination of Conventional and
microwave synthesis
Increase in Porosity and hence high
CEC values
Better Quality of Zeolites
15. High CEC
pH control
Effect of Time, Temp and Base
Process Optimization