Julian Paolo Biyo Jason Andrei TemeloI-RubyPhilippine Science High School Western Visayas Campus Investigatory Project
TITLE: Effect of the Different Types of Substrates on theBiodegradability of SM Plastic Bags I.
Background of the Study
Official figures show that plastics make up around 25% of thegarbage that metro manila churns out, while an independent surveyconducted by Ecowaste Coalition and Greenpeace on the compositionof discards on manila bay in 2006 found that 51% were plastic bags,19% sachets and junk food wrappers, 5% Styrofoam, 1% hard plastics,10% rubber, 13% biodegradable wastes (Cayetano, 2008;www.senatorpiacayetano.com/psc/pressreleasedetails.php?recordID=175)Biodegradable plastics are degradable plastics on which thedegradation results from the action of naturally occurring micro-organisms such as bacteria, fungi , and algae (email@example.com). These plastics are broken down into water, carbon dioxide, methaneand biomass primarily through enzymatic action on microorganisms(Azios, 2007www.csmonitor.com/2007/1219/p16s01 -sten.html).Biodegradable will fully disintegrate in six months or less. It turns intopowder and blends with the soil after a few months (Demetillo, 2008www.smprime.com/News.php?BlurbID=1113).Many biodegradable plastics will decompose in industrial plants,backyard compost piles, or open environments. The inherentbiodegradability of plastics depend on several environmental factorssuch as moisture, temperature, surface area, and the manufacturingmethod of the finished product. (Nolan-ITU Pty Ltd, 2002www.environment.gov.au/settlement/publications/waste/deg) [pic][pic][pic][pic][pic]
Although some brands claim to be biodegradable in open air andsaltwater, virtually no decomposition occurs within a closed landfillthat has been capped, preventing air circulation. (Azios, 2007www.csmonitor.com/2007/1219/p16s01 -sten.html) The SM mall chain has started shifting biodegradable plasticbags for its supermarkets and department...