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The sipper: What kind of membranes are we testing?
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No.2 Revision
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The
sipper:
Sipper or Pit Life Extender :
What kind of membranes are we testing?
There will be two type of Sipper or pit life extender.
The first is a simple displacement pump without any form of membrane and where the outlet of the dump discharges directly into a soak away, so as to prevent any waste being dumped near the house. The aim is to test the market and see HH would buy such a product.
The second will contain the membrane and this where compromises will have to be made. The most likely would be micro membranes which would stop the bacteria, but not the viruses. These are cheap and durable and the issue may be the surface area of membrane needed to achieve the required water discharge rates. Ultra filtration removes viruses, but I suspect requires power and a cross flow approach to make it work. It is also more expansive to buy.
We do not want to get burdened by the need to a discharge of drinking water standards - this is where the Gates Foundation seem to be getting stuck. Apparently conventional treatment plants are not effective in removing viruses and they are hard to detect using simple tests.
The moral question is perhaps around the poor have higher standard imposed on them than the rich. Also - the one step at a time is a better approach.
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No.3 Revision
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The Sipper or Pit Life Extender : What kind of membranes are we testing?
There will be two type of Sipper or pit life extender.
The first is a simple displacement pump without any form of membrane and where the outlet of the dump discharges directly into a soak away, so as to prevent any waste being dumped near the house. The aim is to test the market and see HH would buy such a product.
The second will contain the membrane and this where compromises will have to be made. The most likely would be micro membranes which would stop the bacteria, but not the viruses. These are cheap and durable and the issue may be the surface area of membrane needed to achieve the required water discharge rates. Ultra filtration removes viruses, but I suspect requires power and a cross flow approach to make it work. It is also more expansive to buy.
We do not want to get burdened by the need to a discharge of drinking water standards - this is where the Gates Foundation seem to be getting stuck. Apparently conventional treatment plants are not effective in removing viruses and they are hard to detect using simple tests.
The moral question is perhaps around the poor have higher standard imposed on them than the rich. Also - the one step at a time is a better approach.
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The Sipper or Pit Life Extender : What kind of membranes are we testing?
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