[Digestion] energy calculations
Johan Carels
carelsjohan at telenet.be
Sat Mar 5 13:10:59 CST 2011
Hi Kshanika Gooneesekera,
the biogas-value of food waste depends on the fat-, protein and carbo
hydrate - content of this substrate and his dry matter content.
The average we experience here in Belgium with food waste of 25% DM is:
So, max. about 170 MJ per day with the above amount of food waste at 25%
DM.
K rgds
Johan Carels
www.jcarels.be
Van: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] Namens Kshanika
Goonesekera
Verzonden: vrijdag 4 maart 2011 4:51
Aan: For Discussion of Anaerobic Digestion
Onderwerp: Re: [Digestion] energy calculations
Hi all,
I've got a proposal for a biogas plant at our textile factory in Sri Lanka.
I need to verify the energy per day to assess the feasibility of this
project.
The contractors propose a 90m3 plant (comprising of 3 tanks - 60m3, 20m3 and
10m3) for a daily input of 450kg of food waste from the canteen.
My question is will this plant supply enough gas to cover the present LPG
consumption?
Present LPG consumption in the kitchen:
cylinders per day
3
cylinders per month
60
Gas weight per cylinder
37.5
kg
Energy requirement per day
4,950
MJ/kg
food waste
450
kg/day
Assuming a food:biogas of 1:1, 450m3 of biogas will be produced per day. Of
which 60% is CH4 hence, energy obtained = 13,500MJ/day (calorific value of
CH4 taken as 50.09MJ/m3)
However, calculating the energy obtained using the equation below and taking
15% of the food waste as Carbon content,
Coe/Co = 0.014T + 0.28
Gives the energy per day as 3,763MJ/day
Which of these values am I to trust?
Thanks and regards
Kshanika Goonesekera
Sri Lanka
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