Biodigesters Light Up Clean Energy Stoves in Rural El Salvador

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Marisol and Misael Menjívar pose next to the biodigester installed in March in the backyard of their home in El Corozal, a rural settlement located near Suchitoto in central El Salvador. With a biotoilet and stove, the couple produces biogas for cooking from feces, which saves them money. The biotoilet can be seen in the background. CREDIT: Edgardo Ayala / IPS

Marisol and Misael Menjívar pose next to the biodigester installed in March in the backyard of their home in El Corozal, a rural settlement located near Suchitoto in central El Salvador. With a biotoilet and stove, the couple produces biogas for cooking from feces, which saves them money. The biotoilet can be seen in the background. CREDIT: Edgardo Ayala / IPS

By Edgardo Ayala
SUCHITOTO, El Salvador , Jul 25 2023 (IPS)

A new technology that has arrived in rural villages in El Salvador makes it possible for small farming families to generate biogas with their feces and use it for cooking – something that at first sounded to them like science fiction and also a bit smelly.

In the countryside, composting latrines, which separate urine from feces to produce organic fertilizer, are very popular. But can they really produce gas for cooking?

“It seemed incredible to me,” Marisol Menjívar told IPS as she explained how her biodigester, which is part of a system that includes a toilet and a stove, was installed in the backyard of her house in the village of El Corozal, near Suchitoto, a municipality in the central Salvadoran department of Cuscatlán.”When the first ones were installed here, I was excited to see that they had stoves hooked up, and I asked if I could have one too.” — Marisol Menjívar

“When the first ones were installed here, I was excited to see that they had stoves hooked up, and I asked if I could have one too,” added Marisol, 48. Hers was installed in March.

El Corozal, population 200, is one of eight rural settlements that make up the Laura López Rural Water and Sanitation Association (Arall), a community organization responsible for providing water to 465 local families.

The families in the small villages, who are dedicated to the cultivation of corn and beans, had to flee the region during the country’s 1980-1992 civil war, due to the fighting.

After the armed conflict, they returned to rebuild their lives and work collectively to provide basic services, especially drinking water, as have many other community organizations, in the absence of government coverage.

In this Central American country of 6.7 million inhabitants, 78.4 percent of rural households have access to piped water, while 10.8 percent are supplied by wells and 10.7 percent by other means.

With small stoves like this one, a score of families in El Corozal in central El Salvador cook their food with biogas they produce themselves, thanks to a government program that has brought clean energy technology to these remote rural villages. CREDIT: Edgardo Ayala / IPS

With small stoves like this one, a score of families in El Corozal in central El Salvador cook their food with biogas they produce themselves, thanks to a government program that has brought clean energy technology to these remote rural villages. CREDIT: Edgardo Ayala / IPS

Simple green technology

The biodigester program in rural areas is being promoted by the Salvadoran Water Authority (Asa).

Since November 2022, the government agency has installed around 500 of these systems free of charge in several villages around the country.

The aim is to enable small farmers to produce sustainable energy, biogas at no cost, which boosts their income and living standards, while at the same time improving the environment.

The program provides each family with a kit that includes a biodigester, a biotoilet, and a small one-burner stove.

In El Corozal, five of these kits were installed by Asa in November 2022, to see if people would accept them or not. To date, 21 have been delivered, and there is a waiting list for more.

In El Corozal, a rural settlement in the municipality of Suchitoto in central El Salvador, the technology of family biodigesters arrived at the end of last year, and some families are now producing biogas to light up their stoves and cook their food at no cost. CREDIT: Edgardo Ayala / IPS

In El Corozal, a rural settlement in the municipality of Suchitoto in central El Salvador, the technology of family biodigesters arrived at the end of last year, and some families are now producing biogas to light up their stoves and cook their food at no cost. CREDIT: Edgardo Ayala / IPS

“With the first ones were set up, the idea was for people to see how they worked, because there was a lot of ignorance and even fear,” Arall’s president, Enrique Menjívar, told IPS.

In El Corozal there are many families with the surname Menjívar, because of the tradition of close relatives putting down roots in the same place.

“Here we’re almost all related,” Enrique added.

The biodigester is a hermetically sealed polyethylene bag, 2.10 meters long, 1.15 meters wide and 1.30 meters high, inside which bacteria decompose feces or other organic materials.

This process generates biogas, clean energy that is used to fuel the stoves.

The toilets are mounted on a one-meter-high cement slab in latrines in the backyard. They are made of porcelain and have a handle on one side that opens and closes the stool inlet hole.

One of the main advantages that family biodigesters have brought to the inhabitants of El Corozal, a small village in the Salvadoran department of Cuscatlán, is that the whole process begins with clean, hygienic toilets, like this one set up in Marleni Menjívar's backyard, as opposed to the older dry composting latrines, which drew flies and cockroaches. To the left of the toilet is the small handle used to pump water to flush the feces into the biodigester. CREDIT: Edgardo Ayala / IPS

One of the main advantages that family biodigesters have brought to the inhabitants of El Corozal, a small village in the Salvadoran department of Cuscatlán, is that the whole process begins with clean, hygienic toilets, like this one set up in Marleni Menjívar’s backyard, as opposed to the older dry composting latrines, which drew flies and cockroaches. To the left of the toilet is the small handle used to pump water to flush the feces into the biodigester. CREDIT: Edgardo Ayala / IPS

They also have a small hand pump, similar to the ones used to inflate bicycle tires, and when the handle is pushed, water is pumped from a bucket to flush the waste down the pipe.

The underground pipe carries the biomass by gravity to the biodigester, located about five meters away.

The system can also be fed with organic waste, by means of a tube with a hole at one end, which must be opened and closed.

Once it has been produced, the biogas is piped through a metal tube to the small stove mounted inside the house.

“I don’t even use matches, I just turn the knob and it lights up,” said Marisol, a homemaker and caregiver. Her husband Manuel Menjívar is a subsistence farmer, and they have a young daughter.

In El Corozal, biodigesters have been installed for families of four or five members, and the equipment generates 300 liters of biogas during the night, enough to use for two hours a day, according to the technical specifications of Coenergy, the company that imports and markets the devices.

But there are also kits that are used by two related families who live next to each other and share the equipment, which includes, in addition to the toilet, a larger biodigester and a two-burner stove.

With more sophisticated equipment, electricity could be generated from biogas produced from landfill waste or farm manure, although this is not yet being done in El Salvador.

Marleni Menjivar gets ready to heat water on her ecological stove, watched closely by her four-year-old daughter, in El Corozal in central El Salvador, where an innovative government program to produce biogas has arrived. With this technology, people save money by buying less liquefied gas while benefiting the environment. CREDIT: Edgardo Ayala / IPS

Marleni Menjivar gets ready to heat water on her ecological stove, watched closely by her four-year-old daughter, in El Corozal in central El Salvador, where an innovative government program to produce biogas has arrived. With this technology, people save money by buying less liquefied gas while benefiting the environment. CREDIT: Edgardo Ayala / IPS

Saving money while caring for the environment

The families of El Corozal who have the new latrines and stoves are happy with the results.

What they value the most is saving money by cooking with gas produced by themselves, at no cost.

They used to cook on wood-burning stoves, in the case of food that took longer to make, or on liquefied gas stoves, at a cost of 13 dollars per gas cylinder.

Marleni Menjívar, for example, used two cylinders a month, mainly because of the high level of consumption demanded by the family business of making artisanal cheeses, including a very popular local kind of cottage cheese.

Every day she has to cook 23 liters of whey, the liquid left after milk has been curdled. This consumes the biogas produced overnight.

For meals during the day Marleni still uses the liquefied gas stove, but now she only buys one cylinder a month instead of two, a savings of about 13 dollars per month.

“These savings are important for families here in the countryside,” said Marleni, 28, the mother of a four-year-old girl. The rest of her family is made up of her brother and grandfather.

“We also save water,” she added.

The biotoilet requires only 1.2 liters of water per flush, less than conventional toilets.

In addition, the soils are protected from contamination by septic tank latrines, which are widely used in rural areas, but are leaky and unhygienic.

The new technology avoids these problems.

The liquids resulting from the decomposition process flow through an underground pipe into a pit that functions as a filter, with several layers of gravel and sand. This prevents pollution of the soil and aquifers.

Also, as a by-product of the decomposition process, organic liquid fertilizer is produced for use on crops.

Most families in the rural community of El Corozal have benefited from one-burner stoves that run on biogas produced in family biodigesters. Larger two-burner stoves are also shared by two related families, where they cook on a griddle one of the favorite dishes of Salvadorans: pupusas, corn flour tortillas filled with beans, cheese and pork, among other ingredients. CREDIT: Coenergy El Salvador

Most families in the rural community of El Corozal have benefited from one-burner stoves that run on biogas produced in family biodigesters. Larger two-burner stoves are also shared by two related families, where they cook on a griddle one of the favorite dishes of Salvadorans: pupusas, corn flour tortillas filled with beans, cheese and pork, among other ingredients. CREDIT: Coenergy El Salvador

Checking on site: zero stench

Due to a lack of information, people were initially concerned that if the biogas used in the stoves came from the decomposition of the family’s feces, it would probably stink.

And, worst of all, perhaps the food would also smell.

But little by little these doubts and fears faded away as families saw how the first devices worked.

“That was the first thing they asked, if the gas smelled bad, or if what we were cooking smelled bad,” said Marleni, remembering how the neighbors came to her house to check for themselves when she got the latrine and stove installed in December 2022.

“That was because of the little information that was available, but then we found that this was not the case, our doubts were cleared up and we saw there were no odors,” she added.

She said that, like almost everyone in the village, her family used to have a dry composting toilet, but it stank and generated cockroaches and flies.

“All that has been eliminated, the bathrooms are completely hygienic and clean, and we even had them tiled to make them look nicer,” Marleni said.

She remarked that hygiene is important to her, as her little girl can now go to the bathroom by herself, without worrying about cockroaches and flies.

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Recipes with a Taste of Sustainable Development on the Coast of El Salvador

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Biodiversity, Civil Society, Development & Aid, Economy & Trade, Editors’ Choice, Energy, Environment, Featured, Food & Agriculture, Global Governance, Green Economy, Headlines, Integration and Development Brazilian-style, IPS UN: Inside the Glasshouse, Latin America & the Caribbean, Poverty & SDGs, Projects, Regional Categories, Special Report, TerraViva United Nations

Environment

María Luz Rodríguez stands next to her solar oven where she cooked lasagna in the village of El Salamar in San Luis La Herradura municipality. In this region in southern El Salvador, an effort is being made to implement environmental actions to ensure the sustainable use of natural resources. CREDIT: Edgardo Ayala/ IPS

María Luz Rodríguez stands next to her solar oven where she cooked lasagna in the village of El Salamar in San Luis La Herradura municipality. In this region in southern El Salvador, an effort is being made to implement environmental actions to ensure the sustainable use of natural resources. CREDIT: Edgardo Ayala/ IPS

SAN LUIS LA HERRADURA, El Salvador, Mar 31 2021 (IPS) – Salvadoran villager Maria Luz Rodriguez placed the cheese on top of the lasagna she was cooking outdoors, put the pan in her solar oven and glanced at the midday sun to be sure there was enough energy for cooking.

“Hopefully it won’t get too cloudy later,” Maria Luz, 78, told IPS. She then checked the thermometer inside the oven to see if it had reached 150 degrees Celsius, the ideal temperature to start baking.

She lives in El Salamar, a coastal village of 95 families located in San Luis La Herradura, a municipality in the central department of La Paz which is home to some 30,000 people on the edge of an impressive ecosystem: the mangroves and bodies of water that make up the Estero de Jaltepeque, a natural reserve whose watershed covers 934 square kilometres.

After several minutes the cheese began to melt, a clear sign that things were going well inside the solar oven, which is simply a box with a lid that functions as a mirror, directing sunlight into the interior, which is covered with metal sheets.

“I like to cook lasagna on special occasions,” Maria Luz said with a smile.

After Tropical Storm Stan hit Central America in 2005, a small emergency fund reached El Salamar two years later, which eventually became the start of a much more ambitious sustainable development project that ended up including more than 600 families.

Solar ovens and energy-efficient cookstoves emerged as an important component of the programme.

Aerial view of Estero de Jaltepeque, in San Luis La Herradura, a municipality on the Pacific coast in southern El Salvador where a sustainable development programme is being carried out in local communities, including the use of solar stoves and sustainable fishing and agriculture techniques. CREDIT: Edgardo Ayala /IPS

Aerial view of Estero de Jaltepeque, in San Luis La Herradura, a municipality on the Pacific coast in southern El Salvador where a sustainable development programme is being carried out in local communities, including the use of solar stoves and sustainable fishing and agriculture techniques. CREDIT: Edgardo Ayala /IPS

The project was financed by the Global Environment Facility‘s (GEF) Small Grants Programme, and El Salamar was later joined by other villages, bringing the total number to 18. The overall investment was more than 400,000 dollars.

In addition to solar ovens and high-energy rocket stoves, work was done on mangrove reforestation and sustainable management of fishing and agriculture, among other measures. Agriculture and fishing are the main activities in these villages, in addition to seasonal work during the sugarcane harvest.

While María Luz made the lasagna, her daughter, María del Carmen Rodríguez, 49, was cooking two other dishes: bean soup with vegetables and beef, and rice – not in a solar oven but on one of the rocket stoves.

This stove is a circular structure 25 centimetres high and about 30 centimetres in diameter, whose base has an opening in which a small metal grill is inserted to hold twigs no more than 15 centimetres long, which come from the gliridicia (Gliricidia sepium) tree. This promotes the use of living fences that provide firewood, to avoid damaging the mangroves.

The stove maintains a good flame with very little wood, due to its high energy efficiency, unlike traditional cookstoves, which require several logs to prepare each meal and produce smoke that is harmful to health.

María del Carmen Rodríguez cooks rice on a rocket stove using a few twigs from a tree species that emits less CO2 than mangroves, whose sustainability is also preserved thanks to the use of the tree. Many families in the community of El Salamar have benefited from this energy-efficient technology, as well as other initiatives promoted along the Pacific coast in southern El Salvador. CREDIT: Edgardo Ayala /IPS

María del Carmen Rodríguez cooks rice on a rocket stove using a few twigs from a tree species that emits less CO2 than mangroves, whose sustainability is also preserved thanks to the use of the tree. Many families in the community of El Salamar have benefited from this energy-efficient technology, as well as other initiatives promoted along the Pacific coast in southern El Salvador. CREDIT: Edgardo Ayala /IPS

The rocket stove can cook anything, but it is designed to work with another complementary mechanism for maximum energy efficiency.

Once the stews or soups have reached boiling point, they are placed inside the “magic” stove: a circular box about 36 centimetres in diameter made of polystyrene or durapax, as it is known locally, a material that retains heat.

The food is left there, covered, to finish cooking with the steam from the hot pot, like a kind of steamer.

“The nice thing about this is that you can do other things while the soup is cooking by itself in the magic stove,” explained María del Carmen, a homemaker who has five children.

The technology for both stoves was brought to these coastal villages by a team of Chileans financed by the Chile Fund against Hunger and Poverty, established in 2006 by the government of that South American country and the United Nations Development Programme (UNDP) to promote South-South cooperation.

The Chileans taught a group of young people from several of these communities how to make the components of the rocket stoves, which are made from clay, cement and a commercial sealant or glue.

The blue crab is one of the species raised in nurseries by people in the Estero de Jaltepeque region in southern El Salvador, as part of an environmental sustainability project in the area financed by the Global Environment Facility’s Small Grants Programme. CREDIT: Edgardo Ayala/IPS

The blue crab is one of the species raised in nurseries by people in the Estero de Jaltepeque region in southern El Salvador, as part of an environmental sustainability project in the area financed by the Global Environment Facility’s Small Grants Programme. CREDIT: Edgardo Ayala/IPS

The use of these stoves “has reduced carbon dioxide (CO2) emissions by at least 50 percent compared to traditional stoves,” Juan René Guzmán, coordinator of the GEF’s Small Grants Programme in El Salvador, told IPS.

Some 150 families use rocket stoves and magic stoves in 10 of the villages that were part of the project, which ended in 2017.

“People were given their cooking kits, and in return they had to help plant mangroves, or collect plastic, not burn garbage, etc. But not everyone was willing to work for the environment,” Claudia Trinidad, 26, a native of El Salamar and a senior studying business administration – online due to the COVID pandemic – at the Lutheran University of El Salvador, told IPS.

Those who worked on the mangrove reforestation generated hours of labour, which were counted as more than 800,000 dollars in matching funds provided by the communities.

In the project area, 500 hectares of mangroves have been preserved or restored, and sustainable practices have been implemented on 300 hectares of marine and land ecosystems.

Petrona Cañénguez shows how she cooks bean soup on an energy-efficient rocket stove in an outside room of her home in the hamlet of San Sebastián El Chingo, one of the beneficiaries of a sustainable development programme in the municipality of San Luis La Herradura, on El Salvador's southern coast. CREDIT: Edgardo Ayala /IPS

Petrona Cañénguez shows how she cooks bean soup on an energy-efficient rocket stove in an outside room of her home in the hamlet of San Sebastián El Chingo, one of the beneficiaries of a sustainable development programme in the municipality of San Luis La Herradura, on El Salvador’s southern coast. CREDIT: Edgardo Ayala /IPS

Petrona Cañénguez, from the town of San Sebastián El Chingo, was among the people who participated in the work. She was also cooking bean soup for lunch on her rocket stove when IPS visited her home during a tour of the area.

“I like the stove because you feel less heat when you are preparing food, plus it’s very economical, just a few twigs and that’s it,” said Petrona, 59.

The bean soup, a staple dish in El Salvador, would be ready in an hour, she said. She used just under one kilo of beans, and the soup would feed her and her four children for about five days.

However, she used only the rocket stove, without the magic stove, more out of habit than anything else. “We always have gliridicia twigs on hand,” she said, which make it easy to use the stove.

Although the solar oven offers the cleanest solution, few people still have theirs, IPS found.

This is due to the fact that the wood they were built with was not of the best quality and the coastal weather conditions and moths soon took their toll.

Maria Luz is one of the few people who still uses hers, not only to cook lasagna, but for a wide variety of recipes, such as orange bread.

However, the project is not only about stoves and ovens.

Some families living in coastal villages in the municipality of San Luis La Herradura have dug ponds for sustainable fishing, which was of great help to the local population during the COVID-19 lockdown in this coastal area of southern El Salvador. CREDIT: Edgardo Ayala /IPS

Some families living in coastal villages in the municipality of San Luis La Herradura have dug ponds for sustainable fishing, which was of great help to the local population during the COVID-19 lockdown in this coastal area of southern El Salvador. CREDIT: Edgardo Ayala /IPS

The beneficiary families also received cayucos (flat-bottomed boats smaller than canoes) and fishing nets, plus support for setting up nurseries for blue crabs and mollusks native to the area, as part of the fishing component with a focus on sustainability in this region on the shores of the Pacific Ocean.

Several families have dug ponds that fill up with water from the estuary at high tide, where they raise fish that provide them with food in times of scarcity, such as during the lockdown declared in the country in March 2020 to curb the spread of coronavirus.

The project also promoted the planting of corn and beans with native seeds, as well as other crops – tomatoes, cucumbers, cushaw squash and radishes – using organic fertiliser and herbicides.

The president of the Local Development Committee of San Luis La Herradura, Daniel Mercado, told IPS that during the COVID-19 health emergency people in the area resorted to bartering to stock up on the food they needed.

“If one community had tomatoes and another had fish, we traded, we learned to survive, to coexist,” Daniel said. “It was like the communism of the early Christians.”

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