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Re: E-Z Home Aquaculture

In article <JMC.94Oct15083949@sail.stanford.edu>,
John McCarthy <jmc@cs.Stanford.EDU> wrote:
>In article <37k5f4$adc@shore.shore.net> wbw@shore.net (William B. Warren) writes:
>
>   If one were to grow some tilapia in a solar algae tank or two, pump 
>   the wastewater through a nitrifying tank, and then divert the water 
>   through hydroponically grown grasses, herbs, etc. before returning it to 
>   the fish tank(s), is this water a satisfactory nutrient solution? 
>
>   Does one need to feed the fish a particular food, or a particular variety of
>   foods to obtain a complete nutrient solution for the plants? Or would one 
>   need to regularly add certain trace elements or salts?
>
>   Ideas,Comments,Suggestions,Criticism?
>   Thanks in Advance,
>		    Will
>
>In the simple system you have described, everyone eating the fish
>would get to share the all diseases of everyone contributing to the
>waste.
>-- 
>John McCarthy, Computer Science Department, Stanford, CA 94305

I don't understand... We'd end up with fish diseases? The idea is to 
treat the fish wastewater with hydroponically grown plants, not human 
wastewater.  John, what modifications would you suggest?

On board my 53' biobarge I treat small amounts of human sewage 
biologically in a series of 22 tanks. Almost no pathogens make it through 
my 'marshland' tanks (hydroponically grown spartina).

Perhaps Ma nature knows her stuff,
William



Article 21922 of rec.gardens:
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From: stngiam@athena.mit.edu (Shih-Tung Ngiam)
Newsgroups: rec.gardens
Subject: Re: Lead from Paint
Date: 28 Aug 1993 22:10:13 GMT
Organization: Massachusetts Institute of Technology
Lines: 26
Message-ID: <STNGIAM.93Aug28181013@primavera.mit.edu>
References: <CCHH1u.9tz@cbnewst.cb.att.com>
NNTP-Posting-Host: primavera.mit.edu
In-reply-to: ebf@cbnewst.cb.att.com's message of 28 Aug 93 19:05:52 GMT

In article <CCHH1u.9tz@cbnewst.cb.att.com> ebf@cbnewst.cb.att.com (eileen.b.fleming) writes:

>   Tomatoes are growing within 6 feet of the house -- 
>   is it possible for the plants to take up the lead
>   from the soil and  deposit the lead in the tomato fruits?

  Fruiting crops are generally less prone to lead uptake than root crops or
leafy vegetables.  However, if the lead level in the soil is very high,
the crops might still contain high levels of lead.  

>   Is there a way to cheaply test for lead concentration
>   in the soil or in the tomatoes themselves?

  The U Mass Agricultural Extension tests soil for lead in addition to
testing for NPK and other nutrients.  The total cost for all the tests
is $7.50 per sample.  They also analyze plant tissue for lead, at a cost
of $10.  Try calling your county Extension Agent (should be listed under
the county government, in the phone book), for details of the procedure
in your area.

Shih Tung
Chem E
Best l'il Tech School
on the Charles