[permaculture] [Fwd: [SANET-MG] biogas bonanaza]
Lawrence F. London, Jr.
lfl at intrex.net
Tue Jun 21 15:22:11 EDT 2005
-------- Original Message --------
Subject: [SANET-MG] biogas bonanaza
Date: Tue, 21 Jun 2005 15:14:17 -0400
From: jcummins <jcummins at UWO.CA>
Reply-To: Sustainable Agriculture Network Discussion Group
<SANET-MG at LISTS.IFAS.UFL.EDU>
To: SANET-MG at LISTS.IFAS.UFL.EDU
http://www.i-sis.org.uk/BiogasBonanza.phpISIS Press Release 20/06/05
Biogas Bonanza for Third World Development
Biogas, a by-product of farmyard waste-treatment, has emerged as a major
boon for Third World countries, bringing health, social, environmental,
and financial benefits Dr. Mae-Wan Ho
Sources for this report are available in the ISIS members site. Full
Biogas energy, readily available, cheap and decentralized
The United Nations Development Programme (UNDP) 1997 Report, Energy
After Rio: Prospects and Challenges  identified community biogas
plants as one of the most useful decentralized sources of energy supply.
Unlike the centralized energy supply technologies, such as power plants
based on hydroelectricity, coal, oil or natural gas, that have hitherto
been the only choices open to rural communities, biogas plants do not
require big capital to set up, and do not pose environmental problems
that excite public opposition. Instead, in most cases, they offer
solutions to existing environmental problems, and many unexpected
The organic materials needed for producing biogas in an anaerobic
digester are readily available in developing countries. These include
firewood, agricultural wastes and animal wastes. Many countries have
large cattle and buffalo herds producing tonnes of manure.
Traditionally, these wastes are carefully collected in India and used as
fertilizer, but the increasing scarcity of firewood has forced many
villagers to burn dung-cakes in cooking their food.
As biogas plants yield good quality sludge fertilizer, the biogas fuel
and/or electricity generated is an additional bonus. And this has
motivated the large biogas programmes in a number of developing
countries, starting with China.
Overcoming early obstacles
China began mass adoption of biogas in 1975 under the slogan “biogas for
every household”. Within the first few years, 1.6 million digesters were
constructed annually, but these were of low quality; and by 1980, half
of all digesters were not in use and the rate of adoption had slowed. By
1992, only 5 million family sized plants were still operating, many of
them redesigned to avoid leakage .
In India, as in China, a too-rapid implementation policy in the early
1990s exceeded the capacity of India's research and development
organizations to produce reliable designs and to optimise digester
efficiency. The situation has improved since, especially with the
introduction of a low-cost polyethylene tubular digester. Now, everyone
in India installing a biogas plant has the right to an allowance paid by
the central government .
In a report, Biogas in India: A Sustainable Energy Success Story ,
the authors identified women and children as the major beneficiaries of
biogas in India, where every year, 200 000 families turn away from the
traditional fireplace and have a biogas plant installed to provide
energy for cooking and lighting. By 2000, more than 2 million biogas
plants have been built in India and almost 200 000 permanent jobs created.
India's early difficulties and recent success is being replicated in
countries such as Nepal , Sri Lanka  and Vietnam .
In Vietnam, as in other developing countries - Colombia, Ethiopia,
Tanzania, Cambodia and Bangladesh - the polyethylene tubular digester
was promoted to reduce production cost by using local materials and
simplifying installation and operation. The resulting low-cost digester
has been well received by poor farmers, especially when farmers
participate fully in the necessary maintenance and repair work. Within
ten years, more than 20 000 polyethylene digesters were installed and
mainly paid by the farmers themselves. However, the digesters are still
not fully integrated into the farming system, as there is only limited
use of the effluent as fertilizer for fish and crops (“Dream farms”,
this series). There are also potentials for improving the digester for
greater efficiency, ease of maintenance and durability. More cooperation
between scientists and farmers and credit systems for poor farmers to
install digesters will also help to increase the adoption rate.
In Sri Lanka, biomass accounts for 45% of the country's energy needs,
with petroleum and hydroelectricity supplying 41% and 14% respectively
. Sri Lanka's economy is still largely based on agriculture. A major
constraint to production is the increasing cost of fertilizer, while
solid waste, mainly organic, is collected and disposed at a large number
of unprotected sites, affecting the health of the poorest.
Although biogas digesters have been introduced in Sri Lanka since the
1970s, poor design, lack of maintenance skills and insufficient capacity
to deal with the problems meant that only a third of the 5 000 units
installed functioned properly . The Intermediate Technology
Development Group (ITDG) started a project in 1996 to improve the
success rate of the units on a national level by setting up
demonstration units to help spread information, restoring abandoned
units and training users to operate and maintain them. In addition,
individual farmers get help to install biogas units on their farms to
make use of the manure from their cows.
Mr. Ratnayake is one of the lucky farmers. With nothing more than cow
dung, he now has enough power to cook with, iron the laundry and provide
heat and light for his home without using a single piece of wood. All he
has to do is to collect the manure from his cows in a specially adapted
cattle shed where they feed, mix it with water and leaves it to ferment
in a large concrete tank or pit. The gas produced is collected in a
simple storage tank, from where it is piped into his house to use.
The women and children, freed from firewood collection and from cleaning
smoke-blackened utensils and the disposal of animal waste, gain some two
hours a day for other activities. About 80% now use this time to earn
extra income that currently accounts for approximately 24% of the
family's monthly income. Another advantage of using biogas is that there
is very little waste from the process and it is environmentally friendly.
The dried manure left after biogas is generated is richer than ordinary
manure and makes a fantastic organic fertilizer for Mr. Ratnayake's
crops, which he can sell at a higher price as organic produce.
Biogas brings numerous benefits
The many benefits of biogas are now generally recognized. It has
resulted in a smoke-free and ash-free kitchen, so women and their
children are no longer prone to respiratory infections, and can look
forward to longer, healthier lives. Women are spared the burden of
gathering firewood, a load of 60-80lb per week, which can take up to one
day a week. That, and the practice of containing livestock for manure
collection, which might otherwise graze in the forest, both contribute
to protecting the remaining forests and allowing the forests to regenerate.
The sludge remaining after digestion is richer in valuable nutrients
than the animal manure, providing vegetables, fruits and cereals with a
top quality fertilizer that guarantees better crops.
In rural areas where there is otherwise no electricity supply, biogas
has enabled women to engage in evening study, literacy classes and other
home and community activities.
Cattle dung is no longer stored in the home, but is fed directly to the
biogas digester along with toilet waste. The anaerobic digestion process
also destroys pathogens. As a result, sanitation has greatly improved.
Carbon trading bonanza
There are other benefits for countries that decide to adopt biogas. The
United Nations Framework Convention on Climate Change has set up a Clean
Development Fund, and the World Bank has put together a Carbon Finance
Unit to allow rich countries, which are pumping more carbon into the
atmosphere than is allowed under the Kyoto Protocol, to buy emissions
that poor countries prevent through conserving forests or promoting
renewable energy. An article in the Nepali Times  pointed out that
Nepal's successful biogas programme not only brought farmers a
non-polluting fuel, conserved forests and provided high quality
fertilizer for crops; it can make the rest of the world pay hard cash
for not burning firewood to release carbon dioxide into the atmosphere.
About 85% of the fuel used in Nepal comes from biomass sources like
firewood, animal manure and agricultural residue. The remainder,
kerosene, diesel or liquefied petroleum gases. Its biogas programme
would not have been possible if the users had not received subsidies.
Each biogas unit costs $300 to set up, but the government pays one-third
of the amount.
Nepal's biogas programme is internationally regarded as a model for
successful use of alternative energy for the rural Third World. Nepal
has now overtaken China and India in the number of biogas plants per
capita. Each of its 125 000 functioning digesters prevents five tonnes
of carbon dioxide equivalents from being pumped into the atmosphere
every year. This ‘saved' greenhouse gas is what rich countries are
buying to offset their own emissions, and is worth US$5 million. This
money can be invested back into clean energy that would make Nepal
eligible to trade even more carbon offset to rich polluters.
“We have an initial agreement with the World Bank,” said Sundar Bajgain,
executive director of the Biogas Support Project, which has played a
leading role in installing biogas plants in private houses in 66
districts across the country. The biogas model can be applied to other
renewable energy sources such as hydropower (under 15MW, as recommended
by the International Panel on Climate Change) and solar power to reap
rewards from carbon trading.
Admittedly, paying cash to poor countries not to burn firewood is a
measure of desperation for rich countries like the United States, which,
at 4.6 percent of the world's population and growing, is responsible for
25 percent of global greenhouse gas emissions due to human activities
. It would make much better sense for developed countries to cash in
on the benefits of biogas themselves (“Bug power”, this series), as they
also have greater capacity for research and development to optimise the
production and use of biogas.
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