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Chile’s capital, Santiago, is widely regarded as one of Latin America’s most modern cities. Located in the center of the Santiago Basin, it is surrounded by mountains on all sides. But that beautiful view combined with rapid urbanization has led to thermal inversion, a meteorological phenomenon that holds colder air close to the ground beneath a warmer layer, causing high levels of smog and air pollution.
Indeed, Santiago holds the dubious distinction of being a regular on the World Health Organization’s list of most polluted cities.
“In 2007, Santiago’s PM10 measured 55 percent above the present Chilean air-quality standard,” says Ms. Nancy Manríquez Donoso, chemical engineer at the Chilean National Environmental Commission in Santiago. PM10, or particulate matter, refers to solid or liquid particles found in the air. These particles originate from a variety of sources, including diesel-burning vehicles.
In 2006, the Chilean National Environmental Commission joined forces with the U.S. Environmental Protection Agency (EPA) for a pilot project developed under a free-trade agreement between the two countries. The goal was to demonstrate how ﬁlling vehicle tanks with fuels that have a sulfur level below 50 parts per million (ppm) can improve air quality. As a comparison, most diesel fuels in Chile have a sulfur ppm of 300 versus an average of 15 ppm in the United States. The project would also entail retroﬁtting vehicles with the technology to boost the cleaner fuel’s performance.
The EPA had launched a similar project in Mexico, so members of the Chilean delegation traveled there to learn from the experiences of the project team and talk about how to select the ﬂeet, choose equipment and manage data.
Fortunately, Chile is a member of the United Nations Environment Programme’s Partnership for Clean Fuels and Vehicles, and the team was able to move the money through that group.
With funding secured, the next glitch came in identifying the ﬂeet of vehicles to be used. That process sucked up four months of the project’s anticipated nine- to 12-month schedule. Initially, the idea was to retroﬁ t a ﬂeet of Coca-Cola trucks to increase the project’s visibility.
“One of the problems we ran into was that sometimes those trucks travel in and out of Santiago limits, so they wouldn’t have consistent access to the cleaner fuel,” Mr. Gonzalez says. Putting dirty fuel into the new technology would clog up the ﬁlter, negating the beneﬁts of the retroﬁt.
Plus, a ﬂeet of trucks going about the same tasks wasn’t going to provide enough of a sample. “We needed trucks with different work cycles, that were different sizes and models and had unique emission standards,” Ms. Manríquez says.
Finally, the team settled on a mix of 10 commercial and construction trucks that would stay within the city limits. But given the diversity of the ﬂeet, it took longer to determine how to properly outﬁt each truck with the speciﬁc mufﬂers, converters, ﬁltration systems and other items approved by the EPA. “One of the stipulations with the EPA being involved is the technology must be veriﬁed,” says Mr. Gonzalez. “It’s a pretty long list.”
To retroﬁt a truck, a large canister is installed into the mufﬂer so the emissions coming out are cleaner. “The temperature in the engine is a key element when dealing with retroﬁ tting a truck,” he adds. For the particulates trapped in the canister to regenerate and for the technology to do its job, the engine must be hot—between 500° and 650° Celsius (932° to 1202° Fahrenheit)
With the equipment installed, the retroﬁtted trucks hit the road, going about business as usual.
The pilot ﬂeet was tested in simulated driving cycles on a dynamometer, a machine used to measure torque and rotational speed. “These cycles were representative of real Santiago city driving conditions including weight, speed and acceleration,” Mr. Gonzalez says. “During the cycle, the gas emissions were collected through a tube and funneled to the dilution tunnel where the gases were mixed with air properly ﬁltered to generate a diluted sample. The sample was then tested through different specialized analysis equipment to determine the level of concentration of each pollutant.”
The $150,000 project closed in May 2008—and the success was clear. The retroﬁtted ﬂeet produced 80 percent to 95 percent less emissions than their traditional diesel counterparts. “That’s a very tangible result and shows that if you put regulations in place, this works,” Mr. Gonzalez says.
“Chile and Santiago have done a reasonable job in identifying emission-reduction measures,” Ms. Manríquez says. “However, there is signiﬁcant potential to reduce emissions [even more]. In the short term, we want to establish a program of widespread use of ﬁlters in trucks.”
(This article was originally published in the October 2008 issue of PM Network® magazine.)
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