Dear AD
Very interesting!!
What would you think of an experiment as follows, using 4 reactors:
#1 Reactor: Run as normal
#2 Reactor:: Add biochar as before
Then take a similar weight of biochar, and leach with boiling water, and
filter to get "biochar leach liquor" and "pure biochar"
#3 Reactor: Add "biochar leach liquor"
#4 Reactor: Add "pure biochar"
Best wishes,
Kevin
----- Original Message -----
From: "Anand Karve" <[email protected]>
To: "Discussion of biomass cooking stoves" <[email protected]>
Sent: Saturday, March 23, 2013 11:21 PM
Subject: Re: [Stoves] [biochar] First report from Phnom Penh
Dear Crispin,
the biogas plant filled with charcoal accepted three times the normal
quantity of feedstock and also produced daily three times as much
biogas. It did this for about three months, after which it suddenly
stopped producing any biogas. We tried giving it a rest for a view
weeks, but it did not recover. We reduced the feedstock quantity back
to 1g per litre, but it did not produce any biogas. Three g per litre
of digester capacity represent overfeeding under normal circumstances.
As long as the charcoal in the biogas plant was active, the plant
could accept the high dose of the feedstock. But at some point of
time, the charcoal became inactive and without realising it, we kept
feeding the system with three times the allowable quantity of
feedstock. I think that the pH of the substrate became acidic, causing
the biogas production to stop.
Yours
A.D.Karve
On Fri, Mar 22, 2013 at 8:27 AM, Crispin Pemberton-Pigott
<[email protected]> wrote:
Dear AD
I too have a question: did the addition of 3g/litre still yield 3kg of
gas
per kg of input? That leads to the question, was the gas production rate
dropping so you reduced the feed loading from 3 g to 2 g then 1 g, or was
the gas production rate dropping?
Thanks
Crispin
Dear Anand,
What was the particle size of the char that you added to achieve this
effect? Have you tried different sizes?
Thanks,
Alex
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--
***
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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