Jasper A. Mascarinas, Jan Paul Vincent S. Yap, Fiel G. Ybanez (January 2003)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
This study investigated the efficiency of the engine exhaust device designed and constructed by the researchers in reducing toxic gas emissions from vehicles. It specifically determined the amount of solid particulates, carbon monoxide , and hydrocarbons emitted into the environment by the test vehicles fitted with the engine exhaust device with 100% lime filter, 50%-50% lime-charcoal filter, and 100% charcoal filter, and compared the amounts with the standards set by the Land Transportation Office. It also determined the percent efficiency of the engine exhaust device with the different filter types in terms of the given emission parameters. It also determined if significant differences exist in the amount of the given emission parameters for the different filter types.
Results showed that all the filter types emitted into the environment amounts of solid particulate, carbon monoxide, and hydrocarbons that passed the standards set by the Land Transportation Office. Furthermore, the 100% lime and 100% charcoal filters reduced the amount of solid particulates emitted into the environment, but not significantly lower than the amount emitted from the vehicles without the filters. The 50%-50% lime-charcoal filters did not reduce the amount of solid particulates, instead the amount of carbon monoxide and hydrocarbons emitted into the environment. The 100% lime filter proved to be the most efficient in reducing the solid particulates and carbon monoxide emitted into the environment while the 50%-50% lime-charcoal filter to be the least efficient in reducing the solid particulates and carbon monoxide. The 50%-50% lime-charcoal filter, however, proved to be more efficient in removing hydrocarbons than the 100% charcoal filters.