Particle and fluoride pre filter for b9 plastics
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Particle and Fluoride Pre-Filter for B9 Plastics. Dan Charles – Chemical Engineer John Markidis – Mechanical Engineering Israel Powell – Chemical Engineering An Vu – Chemical Engineering.

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Particle and fluoride pre filter for b9 plastics

Particle and Fluoride Pre-Filter for B9 Plastics

Dan Charles – Chemical Engineer

John Markidis – Mechanical Engineering

Israel Powell – Chemical Engineering

An Vu – Chemical Engineering


Objective

The main goal of this project is to develop a pre-filtration system to reduce turbidity and fluoride levels of water - before it enters the BWM.

Objective

















Particle removal1
Particle Removal

  • Reduction of turbidity was much greater than that of total suspended solids, due to the fact that larger particles have a much greater effect on turbidity than smaller particles.

  • For our objective, turbidity is a more relevant specification. Turbidity is a measure of light scattering, therefore the higher turbidity the greater amount of UV light that would be blocked.

  • The goal for turbidity was achieved and surpassed during testing.


Fluoride adsorption1
Fluoride Adsorption

  • The adsorption of fluoride ions onto bone char has been widely studied

  • Conclusions have been made both for and against using bone char to remove fluoride from water

  • Our results were erratic but did consistently show fluoride was removed from the water


Bone char based bucket defluoridator in tanzanian households
Bone Char Based Bucket Defluoridator in Tanzanian Households

  • 2 Months of Operation

  • 32.5 L/day were treated

  • Average pH 8.56

  • Sorption 1.1

    (mg F-)/(g Bone Char)

  • $10 per unit


Bone char based bucket defluoridator in tanzanian households1
Bone Char Based Bucket Defluoridator in Tanzanian Households



Improvements1
Improvements

  • Straight-walled bucket

    • Companies had minimum order restrictions

    • Not sold locally

    • Better support for handles

      • Extruded shells on rings to hold base of handles

      • Original handle base supports built into CAD files

Vs.


Improvements2
Improvements

  • In extreme cases of turbidity, pre-filtering with a t-shirt is recommended

  • Improve device function: Large amount of suction created makes filter difficult to pull out from bucket

  • Provide lid for handle support and keeping filter level


MSD II Obstacles

  • Were not able to buy the mesh from China

    • Mesh we purchased took up roughly 1/3 of our budget

  • Gaskets were hand cut

  • >5micron particle test

    • When drying the filter paper, weighed less than initial weight

  • Fluoride test strips required acidifying the sample to a 0.5 pH using concentrated hydrochloric acid



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