manure – David South Consulting

By David South, Development Challenges, South-South Solutions

An ingenious solution is helping Rwanda reduce the cost of running its bursting prisons, while improving conditions for the prisoners and helping protect the environment.

The country’s prison population soared to a peak of 120,000 suspects awaiting trial for their role in the 1994 genocide, in which 800,000 Tutsis and moderate Hutus were killed. The traditional court system, gacaca, is being used for national reconciliation, but the process is slow and costly for a country where 90 per cent of the population exist on subsistence agriculture, and where food production has dropped below 70 per cent of the levels needed for self-sufficiency (USAID).

But thanks to enormous, bee-hive shaped human manure digesters, a steady supply of biogas is on tap for cooking and lighting at prisons – the first country in Africa to do this. Five of the country’s largest prisons – two at Gitarama and one each in Butare, Kigali and Cyangugu – now have biogas plants producing 50 per cent of the gas needed to cook for prisoners. It has also saved half of each prison’s US $44,000 a year firewood costs. The money saved is being ploughed back into renovations to the prisons to improve conditions, and to provide more services like healthcare.

Biogas is produced from the fermentation of household or agricultural waste or animal or human feces, and has become a viable alternative when traditional gas sources become more expensive. The waste is placed in a 150 cubic meter beehive-shaped digester and fermented until a gas is produced. According to lead engineer on the project, Ainea Kimaro, 100 cubic meters of waste is turned into 50 cubic meters of fuel by bacteria devouring the manure in just four weeks.

The digesters are a project of the Kigali Institute of Sciences, Technology and Management ‘s Center for Innovations and Technology Transfer.

“Biogas kills two birds with one stone,” Kimaro told the BBC. It gets rid of all the human waste and helps cover the enormous costs of feeding so many prisoners. Prior to the digesters, the quantity of human waste was a real problem: it was flooding down hillsides and leaking into rivers and lakes.

A school, the Lycee de Kigali , also has a digester. “The methane gas is used to cook for 400 students and for operating Bunsen burners in the school laboratories”, Kimaro said.

Many would think this a smelly affair, but in fact the whole process isn’t that pungent. Most of the digester is underground and the gas produced burns a clean, blue smokeless flame. It is much cleaner than the smoke from firewood. The remaining sludgy residue is used as an odourless compost for soil. This is used in the prison gardens to grow maize, mangos, bananas and tomatoes – all of which ends up back on the prisoner’s plates, improving the quality of their nutrition.

“The firewood savings are excellent – they really make a difference for us,” a Cyangugu prison warden said, adding that the odour-free compost had done wonders for the prison gardens. “Look at all these bananas! This fertiliser really is the best,” he said to the BBC.

In Uganda, human urine and feces are being mixed with banana peels, algae, water hyacinth and poultry droppings to make biogas. In Uganda’s rural Mukono district, biogas is used for cooking, lighting pressure lamps and to power engines. The slurry left over is then used to fertilise the soil. For Ugandans, most of whom are rural dwellers, electricity is rare and petrol to run generators and refrigeration units is expensive.

“It keeps the environment free of organic wastes, is convenient, time-saving and reduces smoke-related illnesses often associated with the use of firewood,” said Patrick Nalere, country director of the Heifer Project International, an American NGO which shares livestock and knowledge to reduce poverty. “If the majority of Ugandans adopted biogas, we would preserve our biodiversity. People should exploit decomposing raw materials, which are free. Therefore, no monthly power tariffs.”

Published: February 2008

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP’s South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South’s innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator.

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