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MIT helps Brazilian waste pickers to use leftover cooking oil as vehicle fuel

By Damir Beciri
One Comment25 February 2011

mit-green-greaseThere are estimated half-million garbage pickers in Brazil, known as catadores, who turn waste into profit by sorting out recyclable items and selling their findings to recycling companies. With help from some MIT students, the catadores have a less-expensive and environmentally friendly option to transport those goods by using recycled cooking oil for their fuel.

In summer 2010, members of MIT’s biodiesel team, along with a Media Lab student and one Brazilian MIT student, traveled to Sao Paulo, Brazil, to begin work on the project, called Green Grease. They worked with Rede CataSampa, one of the many catadores cooperatives, to convert two of its large trucks to run directly on filtered vegetable oil.

The team, led by Libby McDonald, a Green Hub Global Program Associate at the Community Innovators Lab in the Department of Urban Studies and Planning, decided to convert the vehicles to use filtered oil instead converting the waste oil to biodiesel. Although conversion allows more flexibility since biodiesel can be used in any diesel vehicle, without any modifications, the biodiesel conversion process requires relatively complex machinery and expensive, toxic chemicals.

By contrast, the oil-filtration process and vehicle conversions are simple and can make use of many recycled parts that the catadores were able to find or improvise, explains junior Angela Hojnacki, president of the Biodiesel@MIT team and a member of the Green Grease team bringing the technology to Brazil. Additional advantage is the warm temperature in Brazil which allows the waste oil to flow properly, without extra heaters that would be needed in colder climates.

The use of filtered vegetable oil could decrease the presence of a pollutant that, if dumped into rivers as it tends to happen now, can kill fish and disrupt ecosystems. In order to counter that, Brazil has begun implementation of environmental regulations which restrict the disposal of waste oil and require the installation of grease traps in residential buildings’ plumbing systems. Aside better environmental practice, it can drastically reduce, or eventually even eliminate, the fuel costs for the catadores to operate their trucks.

Converting the trucks involved installing a separate, parallel fuel tank and fuel delivery system, along with a set of valves that can be adjusted so the vehicle can operate on either standard diesel fuel or filtered oil, depending on what is available. As part of the process, the local catadores found materials such as an old metal street sign that was converted to use as a gasket for the added fuel tank.

Now that the truck drivers in one cooperative have been trained in how to carry out the vehicle conversions and set up filtration systems, they can convert it into a small business – converting other vehicles and providing the oil. On a follow-up visit this year, with the help of the catadores they trained in Sao Paulo, the team plans to expand the project to additional eight cities (Diadema, Garulhos, Sao Jose do Campos, Rio Claro, Campinas, Palmital, Barueri, and Osasco).

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    This is being done in India too. But this oil is used in old vehicles only otherwise new ones get damaged.
    I reproduce below interesting note on the subject:
    (Source:vegetable oil car, Yes! Your car can run on vegetable oil, Can you use regular fuel in a car that runs on vegetable oil?
    • Dayton Says:
    August 3rd, 2010 ):
    Only diesel vehicles can be run on vegetable oil. That being said you really have to look at the area that you live in. If you live in a warm climate you can just pour vegetable oil in your tank, no conversion necessary. What most people don’t know is that diesel engines were originally designed to run on peanut oil by Diesel, the inventor of the engine. So the simplest conversion is a single tank with preheater to run on diesel or oil in one tank. You can run on diesel or veg oil, or a blend of the 2. i have a 1982 Mercedes 300SD 5cyl diesel and I occassionally have left over cooking oil in the summer time. I just pour it in the tank, makes your exhaust smell like an unscented soy candle. So that would be a diesel/veg oil blend. Normally I just run on diesel fuel. The conversion is not cheap. It usually runs anywhere from $400 – $1500 depending on if you need a one or 2 tank system plus bolstering up your filter system. You can always use regular diesel at any time and typically on the 2 tank system there is an electronic switch allowing you to go between the diesel tank and veg oil tank so you can purge the system back to diesel in cold weather.
    Dr.A.Jagadeesh Nellore(AP),India

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