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1. The dosing tube should not be in the vena contracta. The dosing tube should be centered at the very top of the rapid mix tube.
2. We need a low velocity escape route for air that is caught below the vena contracta. We are proposing that a 1/2" PVC pipe be inserted inside the rapid mix pipe against the inside wall of the pipe and down to a hole in the micro mix orifice plate. This 1/2" pipe will extend up through the maximum water surface in the entrance tank. It will provide a stagnant water path for air bubbles to travel up and out of the rapid mix pipe.
3. It may be better to have the orifice plate attached to a pipe coupling rather that have the orifice cut into a pipe cap that is at the very top of the pipe going to the flocculator. The plate would be submerged further below the water surface and the dosing tube would not be so close to the orifice. That would provide some opportunity for some mixing before reaching the micromixing orifice.

Powdered Poly Aluminum Chloride

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Portable water treatment system that can be used in emergencies.

This topic has come up several times and could be a significant contribution.

• From CEE 4540 in 2008 we have an emergency water treatment plant proposal.
• From CEE 4540 in 2009 we have 2 proposals

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