Sand filtration

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Hello!!

Actually, I am interested in generating pores in sand filter column during manufacturing. It is not the conventional sand filter. I am planning to make a solid sand column by fusing (vitrifying) sand at high temperature.

I want to add some sugar in it to produce pores.

Can anyone tell me or guide me about the relation of pores generated with the amount of sugar used?

Or any other method to generate porosity in such types of solid sand filter. 

Thank you!!

 

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9 Answers

  4. From an environmental, economic, energy and others point of view it is do not reasonable. You can more efficient to use sand filters with the replacement of sand with crushed glass waste. Such filters have long been produced and used to clean various waters.

  5. Before using a different material, I would consider if changing the sand particles diameter would not be sufficient  to make this "porous" bed.
    \in theory the intersticeal voids are function of the radius of the particles used in the bed. 

    But a more fundamental issue is to be reminded: Filtration IS NOT only the only result of straining a liquid by the interstices of the bed... filtration is much more than that.

     

  6. Good Morning Mr. Yadav,

    Respectfully consider mixed bed of various mesh size receiving flow through hub and lateral distribution tube...or microporous filter.

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  7. In a loosely packed bed of uniform sand grains, you have between 40 and 45 volume percent of pores. Probably you can increase to 50% or a bit more porosity in a further expanded bed, still sufficiently consolidated, by slightly touching sand grains, that are properly fused when heated to 1650 °C. If this is worth the trouble, I guess you cannot use sugar grains, but must use molten/syrup sugar as otherwise, the sugar grains will melt at 160 °C and your expanded bed may collapse?

    Suppose, you use sugar, then why not add and mix with sand until total volume starts increasing. At that point, the added volume of sugar is the pore volume of your (loosely) packed quartz sand. Any extra added sugar volume is then likely the extra pore volume that will be generated.

    I guess, upon heating and pyrolizingthe sugar to char around 200 °C, foaming occurs, and the bed will not collapse but needs confinement to avoid expansion.

    I imagine, the foam remains stable while you fuse the sand and then burns away after you allow access of oxygen.  

    I wonder if magnesium oxide is an alternative for sugar. It might be more inert well beyond the fusing temperature of quartz, having a melting point of 2800 °C and it is more soluble in acid than quartz, allowing removal by dissolution.

  8. You will loose the backwash expansion to clean the bed if you do it as solid sandfilter