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Re: [nanotech] Re: Material to filter estuarine mud particles and allow water flow

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  • Wayne Richardson
    i was thinking a biodegradable felt curtain that is replaced as it seals from the mud. eventually the inlet would have mud piled up except art the entry point
    Message 1 of 3 , Mar 28, 2006
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      i was thinking a biodegradable felt curtain that is replaced as it seals
      from the mud. eventually the inlet would have mud piled up except art the
      entry point

      On 3/28/06, ill ugg <northernchronic@...> wrote:
      >
      > I think a sand filter can be used to filter out mud (turbitity):
      > http://en.wikipedia.org/wiki/Sand_filter
      > Maybe there is not enough water pressure for this to work for your
      > application.
      > From: Ricardo Carvalho
      > I would like to know if there is some (nano-?)material
      > in the market capable of filtering estuarine mud
      > particles and also, at the same time, of allowing
      > significant water flow throw it. Let me explain
      > better. I'm working on a marina rehabilitation
      > project. This marina is located in an estuary wich is
      > subject to 3,0m tidal amplitudes and extreme mud
      > concentrations in the water column. In order to
      > eliminate the strong sedimentation/siltation inside
      > the marina basin, the existing open entrance must be
      > closed with a 12,0 m wide single gate system. But such
      > gate closing, because of the local tidal variations,
      > also implies strong marina/estuary water levels
      > differences during the tidal cycle and so a very
      > expensive gate must be used. If some mud filtering
      > system could be added to the gate wall, or even added
      > independently, perhaps at its side, allowing water
      > entrance but not mud sediments entrance, the referred
      > water level diferences could be almost eliminated and
      > the gate project would become much less expensive. But
      > a necessary condition is to have a filtering
      > material/system to allow, at the same time, average
      > water flows of up to 0,5 m/s and to block mud entrance
      > insde the basin (usually with d < 50E-6 m). Anyone
      > knows of such material? As much as I know, common
      > geotextiles used in construction works are designed to
      > allow some water flow and to filter only sand
      > sediments, while allowing muds to pass through
      > (otherwise they would accumulate and even block water
      > flow). I believe such magical(?) system/material, if
      > it exists, would be a breakthrough in marina design
      > and siltation reduction.
      >
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