The "biodigester", which converts organic waste to biogas and a liquid fertilizer rich in nutrients, requires little infrastructure: toilets linked to a sealed, brick-lined well connected to a basin. Seventy of these devices are up and running, while another 70 are in the works.

Deprived of air, the bacteria thriving in human excrement eat 85 percent of the refuse while producing methane gas, explained Martin Wartchow, pointing his lighter above a small tube hanging out of the rank. A powerful flame was immediately set ablaze.

"The remaining 15 percent of organic waste is thrown out with the excess water in a green area where they biodegrade," continued the hydrologist, who is working with the Brazilian nongovernmental group Viva Rio in Port-au-Prince.

"Not a single chemical product is used and at the end of the line, the water we collect is completely clean."

The engineer plunged his hand in a basin filled with filtered, clear and, incredibly, odorless liquid. "We even raise fish here."

Recently completed at a Viva Rio center that hosts over 600 young Haitians each day, the installation is due to be linked to a cafeteria under construction to replace wood coals.

Indeed, engineers behind the project hope to reverse Haitians' heavy reliance on wood fuel for cooking and heating due to the lack of cheap sources of energy in the country, the poorest in the Western hemisphere.

As a result, Haiti has seen rapid deforestation. Only 1.5 percent of the western portion of the isle of Hispaniola the country shares with the Dominican Republic is now covered with forests, a massive decrease from 80 percent when discovered by Christopher Columbus in the 15th century.

"The United Nations have funded many studies to find solutions to replace wood coals. But all they had to do was to go to Nicaragua or China," said Wartchow.

In Nicaragua, some 70,000 biodigesters have already been built, and 1,000 times more in China.

The system, just now being implemented in Haiti, also provides a solution to simply and efficiently treat human excrement -- a major problem in the squalid tent cities that sprung up after the devastating January 2010 earthquake, which killed more than 250,000 Haitians and left 1.3 million homeless.

The cholera epidemic exposed the dramatic consequences of Haiti's lack of a true sewage system. The water-borne bacterial disease, which thrives in unhygienic conditions, has claimed 4,700 dead so far.

"Since the epidemic, we have had many requests from clinics that had thrown their waste into the canals until then," said Wartchow.

But once a biodigester installed, there is still much work to do, especially in educating locals to using the new devices. In February, several of the installations were placed in the Santos 17 camp, home to 2,700 people in the suburbs of Port-Au-Prince.

They were erected next to new temporary shelters built out of wood and sheet metal. But the kitchens that were supposed to be hooked up to the gas produced by the toilets were not accessible.

"It's the engineer from the International Organization for Migration who has the key," mumbled Jean-Max Fortune, in charge of the camp.

"People still need to be educated about this," he said, adding that the promised stoves never came.

Roselyne Colas admitted she did not understand how the system could be of any use to her in her cabin.

"I cook with coal," Colas said, pointing to the stove sitting in a corner of the 18 square meter (195 square foot) home she shares with her family.

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