Re: DIG-L: AD Effluent Polishing

[doelle <doelle@ozemail.com.au>]

Dear Lisa,

These systems exist all over SEAsia almost and now start in the Pacific, where fish are a very important protein resource.
You can participate in an electronic conference on Integrated Bio-systems (IBS), which is conducted at present and you will find a lot of information on these systems. If you want to participate, write to the coordinator Jacky Foo<foo@swipnet.se> and he will give you all the instructions.

Furthermore, you can find a lot of information on these systems in the electronic journal Livestock Research for Rural Develpoment at http://www.cipav.org.co/lrrd/lrrdhome.html

I also visited and taught in Mexico, where an excellent researcher in this field, Dra. Eugenia Olguin in the Instituto of Ecologia in Xalapa, Veracruz, Mexico, had established such systems using the effluent from a piggery for algae growth, which subsequently can be used for fish feed.
It amuses me all the time that biologists from the US appear to develop something 'New', which really exists already in developing countries.

Maybe we should ask the developing countries like China, Vietnam, Cambodia etc etc to teach us in the developed world how to make use from our waste. A result of our combined teaching efforst over the past few decades.
[of course I say this with a tongue in cheek !]

I hope you find this helpful. If you have problems with above, just let me know.
Kindest regards
Horst Doelle

At 12:04  10/03/00 +0000, you wrote:
>   Dear all,
>
>I previously wrote regarding thermophilic and mesophilic digestion
>relating to the final composition of the by-products.  Thankyou for all
>your replies and the following discussion.
>
>As I mentioned, our company Greenfinch is currently researching the
>possible re-use of by-products using aquaculture.  We currently use
>aquatic plants as a filtrate media for the liquid fertiliser. i.e. Water
>hyacinths, watercress, duckweed.  They utilise the nutrients growing
>abundantly.  These plants are also used  as a food source for carp and
>tilapia.  The fish are held in enclosed tanks which are fed only by the
>treated effluent (polished water).
>
>In the New Scientist (26.02, pg 20) there was a recent article entitled
>"Foul fare for fish".  This article describes the use of tilapia to polish
>water from sewage works.  A biologist (Ray Drenner) from Texas Christian
>University, Fort Worth, has developed a waste-water purification system in
>which algae utilises the polluting sewage effluent nutrients and the
>tilapia consumes the algae.
>
>Has anyone come across a similar system in use with AD technology.  I know
>this is popular in the developing world but does this type of treatment
>system exist elsewhere?  I would also be very interested to hear any
>comments concerning the use of tilapia as a food source once reared in
>these conditions.  (Our initial input of nutrients is source separated
>household waste- food waste, grass cuttings, no human excretion.)
>
>Thanks again,
>
>
>Lisa Pritchard
>Research Scientist
>Greenfinch Ltd
>Shropshire, UK. 
>
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>--------------------------------------------------
>
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Horst W.Doelle, D.Sc., D.Sc. [h.c.]
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