[Digestion] Digestion Digest, Vol 5, Issue 4

Sun Nov 5 21:44:00 CST 2006

Dear Karve 

  Your suggestion on using cow dung and bagasse seemed to be advantageous. Can you please give some information on air pollution related issues for making the process as a ecofriendly solidwaste management system?

  Thanking you

  Ramanujam 

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Today's Topics:

1. Re: Digestion Digest, Vol 5, Issue 2., large Scale Digester
for Municipal Waste (Bernd Haase) (Art Krenzel)
2. Digester for Municipal Waste (Bernd Haase) (adkarve)

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Message: 1
Date: Sat, 4 Nov 2006 11:34:29 -0800
From: "Art Krenzel" 

Subject: Re: [Digestion] Digestion Digest, Vol 5, Issue 2., large
Scale Digester for Municipal Waste (Bernd Haase)
To: "R.A. Ramanujam" ,

Message-ID: 
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

Ramanujam.

All we do in the cold climates is set up a small scale electrical generator 
at the digestion site. It produces electric power for ourselves and, if 
there is excess, for the grid. We recover the waste heat and heat the 
buildings and the digester tanks as well. It is not a big problem. Instead 
of generating power off site and wasting the rejected heat, we keep the 
power generation onsite and recover the exhaust and water jacket heat 
instead of wasting it.

Such a system could work in the Antarctic if necessary (with suitable 
insulation).

Art Krenzel

> ----- Original Message ----- 
> From: "R.A. Ramanujam" 
> To: 
> Sent: Saturday, November 04, 2006 4:51 AM
> Subject: Re: [Digestion] Digestion Digest, Vol 5, Issue 2.,large Scale
> Digester for Municipal Waste (Bernd Haase)
>
>
>> Dear Bernd
>>
>> There is no low tech large scale digester operational in India for
>> municipal solid waste. There is a plant operating in Chennai city of
>> Tamil Nadu India exclusively for Vegetable market waste. Its capacity is
>> 30 tpd. It is low soilds concentration digester. The maximum gas
>> generation achieved was 1700 cum/d. It is only a demo plant. Therefore
>> we are working on the system to increse the solids concentration to
>> increase the gas production to 2000 - 2300 cum/d. Dry fermentation
>> processes have not been implemented in India till now in large scale as
>> that kind proceeses have to be operated only in thermophilic condition.
>> The biogas generated have to be utilised partly for heating the digester
>> contents. The available gas for energy generation will get reduced. The
>> economic viability of the project is not of acceptable level.
>>
>> regards
>> Ramanujam
>> Assistant Director, Dept of Environmental Technology
>> Central Leather Research Institute
>> Adyar, Chennai 600 020
>> Telefax: +91-44-24450234
>> email: rar_envtech at yahoo.com
>>
>> digestion-request at listserv.repp.org wrote:
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>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of Digestion digest..."
>>
>>
>> Today's Topics:
>>
>> 1. large Scale Digester for Municipal Waste (Bernd Haase)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 3 Nov 2006 07:34:34 +0100 (CET)
>> From: "Bernd Haase"
>> Subject: [Digestion] large Scale Digester for Municipal Waste
>> To: digestion at listserv.repp.org
>> Message-ID:
>> <1864.203.189.135.187.1162535674.squirrel at webmail.hs-bremen.de>
>> Content-Type: text/plain;charset=iso-8859-1
>>
>> Hey colleagues,
>>
>> I'm working on a feasibility study in phnom penh for the anaerobic
>> treatment of municipal waste. I'm wondering if some of you have heared
>> about a low-tech large scale plant that works successfully. I heard 
>> rumors
>> that india has plants running, but couldn't find anything in the web.
>> Please let me now about dry fermentation plants that use household or
>> marktet waste as substrat.
>>
>> thanx bernd
>>
>>
>>
>>
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>> End of Digestion Digest, Vol 5, Issue 2
>> ***************************************
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>>
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>
>
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Message: 2
Date: Sun, 05 Nov 2006 10:36:12 +0530
From: adkarve 
Subject: [Digestion] Digester for Municipal Waste (Bernd Haase)
To: digestion at listserv.repp.org
Message-ID: <001301c700d4$6570b360$4d69fea9 at adkarve>
Content-Type: text/plain; charset=iso-8859-1

Through this message I wish to convey that biogas is not always the ideal
fuel for producing electricity. Methane is a high grade form of fuel. If you
want to run an internal combustion engine, you may have to convert the
biomass into methane. But a lot energy is lost in the process of
biomethanation itself. One kg dry dung would yield 2600 kcal of energy if it
is burned directly, but converted into methane, it yields only 600 kcal
energy. Drying dung or any other biomass for direct combustion is not a
problem in India.One can produce electricity by using a steam turbine, in
which the steam can be generated by burning any fuel. The sugar industry
burns bagasse for this purpose. Similarly, municipal solid waste can also be
burned directly to produce steam and the steam can be used to produce
electricity.
Yours
A.D.Karve
----- Original Message -----
From: Shrinivas Kasulla 
To: 
Sent: Saturday, November 04, 2006 10:12 PM
Subject: [Digestion] Fwd: Re: Digestion Digest, Vol 5,Issue 2.,large Scale
Digester for Municipal Waste (Bernd Haase)

> Hi,
> thats true sir ive also read about many articles and i
> do feel that u are absolutely correct and i do value
> ur suggestions and as far as Dr. Ramanujam's
> suggestions and observations of his demo plant is
> concerned, i have visited that plant and yes they are
> working on a very good technology and i do feel that
> such type of plants will b having great demand in the
> near future.
>
> with regards
> Srinivas Kasulla
> Project Cordinator
> Note: forwarded message attached.
>
>
>
>
>
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