[Digestion] Renewable Energy World biogas article

Thu Jan 13 13:50:24 CST 2011

Dear Deepak,
thanks for the information.
Yours
A.D.Karve

On Thu, Jan 13, 2011 at 9:45 PM, Deepak D. G. <ghindwani at gmail.com> wrote:

> Dear A.D. Karve,
>
> My name is Deepak D.G. and I am from Bali Indonesia.
>
> I just want to add to the number of installed biogas of your design by 7
> units in Bali.
>
> I finished the installation in the month of august 2010 and they are
> running well now.
>
> Rgsd,
> Deepak
>
>> Message: 1
>> Date: Sat, 8 Jan 2011 11:47:03 +0800
>> From: Anand Karve <adkarve at gmail.com>
>> To: For Discussion of Anaerobic Digestion
>>        <digestion at lists.bioenergylists.org>
>> Subject: Re: [Digestion] Renewable Energy World biogas article
>> Message-ID:
>>        <AANLkTinwcfg3v_oo8VrdR-xpm7cp91pbJTHVJjjrzB54 at mail.gmail.com>
>> Content-Type: text/plain; charset="windows-1252"
>>
>> Dear Randy,
>> I give below information about a small biogas plant developed by us. You
>> can
>> contact me personally if you want commercial information.
>> Yours
>> A.D.Karve
>>
>>
>> *ARTI biogas technology*
>>
>>
>>
>> *Background*
>>
>> ?         The organisms that produce biogas reside in the intestines of
>> animals. They exit from the animal body along with dung.
>>
>> ?         The traditional biogas plants use dung as feedstock. 1 kg dung
>> produces about 20 to 30 litres biogas after a fermentation period of about
>> a
>> month.
>>
>> ?         ARTI scientists argued that since these organisms lived in the
>> intestines, they ate what the animals ate.
>>
>> ?         Experiments with human food showed that 1 kg (dry weight) of
>> human
>> food yielded 600 to 800 litres biogas within a fermentation period of just
>> 24 hours.
>>
>> ?         ARTI biogas system, based on human food waste, is about 600 to
>> 800
>> times as efficient as the dung based biogas plant.
>>
>>
>>
>> *Compact biogas plant by ARTI*
>>
>> ?         Because of lower feedstock requirement, and because it is
>> consumed
>> rapidly, ARTI biogas plant is small.  A 1000 litre digester is sufficient
>> for a family.
>>
>> ?         Small size of the plant allows it to be accommodated in any
>> available space, even on the terrace of a house.
>>
>> ?         Fabricated from locally available plastic water tanks, it is
>> installed in just a couple of hours. It can even be moved around.
>>
>> ?         Food waste is plentifully available in urban areas from
>> restaurants, canteens, vegetable markets, fruit juice vendors, flour
>> mills,
>> oil mills, etc.
>>
>> ?         Therefore, technology is suitable for urban areas. Almost 5000
>> plants of this type have so far been installed in India and abroad.
>>
>>
>>
>> *Special features of ARTI biogas plant*
>>
>> ?         Ideal technology for disposal of wet garbage. A 1000 litre plant
>> accepts daily about 2 kg wet garbage.**
>>
>> ?         In nature, the methanogens get their food masticated by animals.
>> Therefore, food waste must be pulped before introducing it into the biogas
>> plant. **
>>
>> ?         About 10 litres water is needed daily as a carrier of the
>> feedstock. It generates daily 10 litres effluent. **
>>
>> ?         Because food waste gets completely converted into biogas, the
>> effluent is watery. It can be recycled or used for watering plants.**
>>
>> ?         In the case of industrial canteens, hostels, resorts and housing
>> colonies, the design and size of biogas plants depend on the amount and
>> type
>> of waste and the available space.**
>>
>> * *
>>
>> *A rural biogas plant using green leaves as feedstock*
>>
>> ?         Experiments with green leaves showed that 10 kg pulped green
>> leaves produced 800 to 1000 litres biogas.  **
>>
>> ?         However, midribs, veins and petioles accumulate as undigested
>> debris inside the digester and ultimately choke the system.**
>>
>> ?         A prototype has been developed from which the accumulated debris
>> can easily be removed without stopping biogas production. **
>>
>> ?         Such a plant can be introduced into rural areas, as growing a
>> leafy crop or plucking leaves from existing vegetation is possible. **
>>
>> * *
>>
>> *A method for green leaf production*
>>
>> ?         50 to 100 sq.m.plot surounded by a skirting of transparent
>> plastic
>> film is planted with a high yielding multicut fodder species. **
>>
>> ?         Effluent and leaf debris from the biogas plant provide nutrients
>> to this plot. Daily water requirement is between 5 to 8 litres per sq.m.
>> **
>>
>> ?         1 or 2 sq.m.area is harvested daily. Leafy waste from crops like
>> cabbage, carrot, radish, and weeds from the field are also acceptable.**
>>
>>
>>
>> *Purification of biogas*
>>
>> ?         Biogas contains volumetrically about 40% carbon dioxide and 60%
>> methane.
>>
>> ?         Therefore biogas has a calorific value of only about 4000
>> kcal/kg
>> as against about 11000 kcal/kg of pure methane.
>>
>> ?         Storing biogas in a moving drum floating over water removes
>> carbon
>> dioxide from biogas.
>>
>> ?         95% pure methane is obtained after 3 days.
>>
>>
>>
>> *Biogas as fuel in internal combustion engine*
>>
>> ?         Biogas can replace 100% petrol or kerosene and 80% of diesel.
>>
>> ?         It is quite possible to use biogas in unpurified state in
>> internal
>> combustion engines.
>>
>> ?         Using it in stationary engines for pumping water or for
>> generating
>> electricity causes no problems.
>>
>> ?         Using it as vehicular fuel is difficult, because it involves
>> compression of biogas and filling it into cylinders.
>>
>>
>> On Wed, Jan 5, 2011 at 3:48 PM, Randy Mott <randymott at ceeres.eu> wrote:
>>
>>
>>
>
>
>
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> for more information about digestion, see
> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>
>

-- 
***
Dr. A.D. Karve
President, Appropriate Rural Technology Institute (ARTI)

*Please change my email address in your records to: adkarve at gmail.com *
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