Hallo Kyle,
I use HDPE water tanks. The reactor is 650 ltr and the gas collector
drum is 550 ltr. I am feeding the reactor with kitchen waste (mostly
banana skin, papaya skin, vegetable leaves) of 1.5 kg per day with 5
liter of water.
I get about 300 liter of gas every day.
I think you just need to wait for the antibiotics to lower and you might
want to change the feed for a while.
Namaste,
Deepak
On 11/14/2012 04:00 AM, [email protected] wrote:
Message: 1
Date: Tue, 13 Nov 2012 10:44:10 +0300
From: Takamoto<[email protected]>
To:[email protected]
Subject: [Digestion] Biogas production
Message-ID:<[email protected]>
Content-Type: text/plain; charset="utf-8"
Dear Biogas List,
I have been testing a plastic (LLDPE) floating drum digester with cow dung and
found that the biogas production was lower than expected (pH 7, 19?C) at around
0.5 cubic meters of biogas per day at 67% methane. The reactor volume is 3.2
cubic meters. I discovered that our dung supplier had recently used the
antibiotic Tetracycline for a few of his cows so there is a chance of
contamination, though at this point, I feel like the antibiotic concentration
would be very low and should not affect gas production. Does anyone have
experience with the effect of antibiotics? Also, what gas production should I
expect from a 3.2 cubic meter reactor that I add 40 kg of cow dung to per day
(plus 40 kg of water)? If I assume 15% TS and 80% of TS are VS then the Organic
Loading Rate is around 1.5 kg -VS/m3/day and our specific methane yield is 0.07
m3 CH4/kg-VS and our digester efficiency is 0.1 m3 CH4/m3 reactor/day. Does
this sound reasonable?
I have also been reviewing research articles on gas production from cow dung
but the results vary widely and sometimes I am not sure if the reported results
are accurate. Also, research papers often use CSTR (continuously stirred tank
reactors?) at 37?C which makes comparing their results to my results rather
difficult. We are getting a new load of non-contaminated cow dung today to see
if that makes a difference. I'll let you know.
I am sure this topic has been discussed before, so I am sorry if I have
repeated the topic. I am newish to the forum so I haven't seen anything on this
yet.
Thanks for your advice,
Kyle
Managing Director
Schutter Energy Ltd.
www.takamotobiogas.com
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