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Technology | Health

Pedal power may clean up Tanzania slum

The Dar es Salaam slums are unhealthy habitats

© Nate Sharpe/afrol News
afrol News, 19 November
- The slums of the Tanzanian capital, Dar es Salaam, are an unhealthy and smelly place due to freely flowing sewage. Now, a researcher has found a low-threshold technology without needing electricity that could clean up the slum.

According to MPhil graduate Nate Sharpe, "pedal power may hold the answer to cheap and efficient sewage removal in some of the world's poorest slums." The Cambridge University researcher hopes his low-tech solution now can be taken into large-scale production.

Mr Sharpe says he is planning to take his "People Powered Poo Pump" to the slums of the Tanzanian capital, Dar es Salaam. Roughly 80 percent of Dar es Salaam's four million residents live in slum conditions.

His trials, if successful, could "revolutionise the removal of faecal sludge from pit latrines common to slums in Africa, Asia and other parts of the developing world - and lead to vast health benefits," the enthusiastic researcher says.

Mr Sharpe has designed a prototype bicycle-powered vacuum pump/tank system which works by putting the end of a hose into a pit latrine and cycling in place for a few minutes on a bike stand. This allows the sludge to be sucked into a bucket attached to the back of the bike.

He hopes the bike could become a viable business proposition for budding entrepreneurs in Dar es Salaam's slums.

His work is featured in the latest edition of the science magazine 'Research Horizons'. Mr Sharpe holds that "many of the world's most densely-packed and poorest slums have terrible sanitation and sewage problems, which leads to huge amounts of disease and illness – much of it preventable if conditions were imp

The "People Powered Poo Pump"

© Nate Sharpe/afrol News

"A lot of the issues currently plaguing pit emptying services stem from the sheer volume of sludge that has to be transported. If smaller amounts could be moved more often, it becomes easy to transport – even on the back of a bicycle."

"The idea has so many social, health and economic benefits," he adds. "An important aspect of the design is that it will be on a par with manual desludging technologies in terms of capital cost."

Mr Sharpe developed the idea for the bike while working on his MPhil at Cambridge (UK), working with Dr Heather Cruickshank. Currently working at MIT in the US, Mr Sharpe has combined his efforts with the team from Sanergy who are developing low cost latrines using a franchise model where waste is collected on a daily basis. They hope the waste produced can be used in bio-digesters for heating and electricity production.

"Few if any of the previous solutions take into account the economic, social and geographical constraints found in slum areas," Mr Sharpe holds. "The prevalence of people living on less than US$ 2 a day means they live in tightly packed, unplanned settlements."

"The pump itself costs less than US$ 100, less than 10 percent of the next cheapest alternative," he adds. "Sometimes, solutions lie not in the development of new technology, but in the creation of a new business angle that works within the local community," Mr Sharpe concludes.

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