Worldwatch: Gathering Waste and Making Good of It
... Sanergy, for example, is a company launched by a group of students at Massachusetts Institute of Technology’s (MIT) Sloan School of Management. The group has designed low-profile sanitation centers that can be constructed anywhere to provide hot showers and clean toilets. These facilities can be built quickly and easily with affordable materials. Waste from the centers is deposited into airtight containers that are collected daily. Then it’s brought to processing facilities that can convert it into biogas. The biogas generates electricity, while the leftover material is made into fertilizer.
The company won a USD $100,000 grant from MIT and has been building its first units in Nairobi. It charges a low pay-per-use fee and hopes to grow by franchising the operation of its units, creating an income opportunity for enterprising residents. As the number of toilets proliferates, so too will the amount of energy the company is able to generate from its processing facilities. It hopes to eventually generate enough energy that it can sell its power to the national grid.
The company’s unique and innovative approach is notable for the way it combines the decentralization of waste collection with the centralization of waste processing. Retrofitting the slums with proper sewage drains is a near impossibility and can be an expensive and potentially politically volatile effort in areas where landownership is at best ambiguous. The self-contained units grant access to sanitary facilities to even those far off the grid. But by centralizing the processing of waste, Sanergy’s facilities will take advantage of the economies of scale present in the waste conversion process. ...