[Digestion] Some calculations for South India

[Yassen Roussev]

Hi Kyle,

In my view the accounting for the burning of the methane  should take
credit for a net reduction
of the CO2 emssions which you would have had if methane was left to bubble
into the atmosphere
from the manure.

I.E. total emssions of manure (21 times more than CO2) minus emissions
emitted CO2 emitted during
burning of methane = net benefit over

Hope that helps,


Yassen

On 9 November 2012 08:09, Takamoto <kyle at takamotobiogas.com> wrote:

> Dear List and Chanakya,
>
> Thanks for the detailed answer. But I was thinking, shouldn't you add
> those two numbers because biogas both reduces Methane emissions from open
> pit composting AND reduces unsustainable CO2 emissions from cooking with
> firewood. Its not an either/or situation, right?
>
> All the best wishes,
>
>  Kyle
> Managing Director
> Schutter Energy Ltd.
> www.takamotobiogas.com
>
>
>
> On Nov 7, 2012, at 10:06 PM, Hoysall Chanakya wrote:
>
> Dear Kyle /Digestion List Members
> Answers to Kyle's Questions
> A rural family with 4 cattle heads producing 40kg animal dung would if
> completely uses it for biogas production produce @40L biogas /kg dung =
> 1600L biogas with 60% methane = 0.686kg methane which is 21 times more
> potent than co2 (21*0.686=14.4kg CO2 per day).  It is assumed by
> attempting to put it for open pit composting only half this weight is
> emitted as methane = 7.2kg CO2e/day [2.63 t COe per year, per family of 5]
>
> Another approach used is that each person uses about 2kg fuelwood per
> capita day of which about 35% is collected unsustainably.   1 kg wood with
> 50% C (general assumption) produces 3.66kg CO2 or which only 35% or
> 1.283kg CO2 is produced per day.  So in a year each person produces 0.468t
> CO2e and per family of 5 persons we get 2.34t CO2 equivalent per family
> per year.
>
> As you see both routes give roughly similar CO2e(quivalent) annually.   I
> am sure you will get plenty of references for this.  Only IPCC default
> will not have these specific cattle dung yield or per capita wood
> consumption data.  This data is typical for rural India around Bangalore
> and has been measured many times.
>
> Best wishes
> Chanakya
>
> --
> Dr. Hoysall Chanakya
> Centre for Sustainable Technologies
> (Assoc. Faculty at Centre for Infrastructure, Sustainable Transport and
> Urban Planning (CiSTUP) and Centre for Contemporary Studies)
> Indian Institute of Science, Bangalore 560 012
> ph 91-80-2293 3046; fax-91 80 2360 0683
>
>
> --
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