EFFECT OF BIODEGRADABLE SM PLASTIC BAG IN DIFFERENT SUBSTRATE

Topics: Biodegradable plastic, Polymer, Plastic Pages: 18 (3092 words) Published: November 12, 2013
EFFECT OF BIODEGRADABLE SM PLASTIC BAG IN DIFFERENT SUBSTRATE

ABSTRACT

The purpose of this Investigatory project is to determine the effect of different substrates

on the biodegradability of SM plastic bags. The materials needed are: 6, 1-litre glass jars; 6,

7”x9” aluminums trays; 12 pcs. 3”x4” SM plastic bags; 500g loam soil; 500g compost soil;

500mL seawater; 500mL tap water; Analytical balance; Graduated cylinder; and Weighing scale.

The procedure involved cutting the SM plastics bags into 3”x4” sizes strips. Label the strips into

C1, C2, C3 for compost soil, L1, L2, L3 for loam soil, S1, S2, S3 for seawater and T1, T2, T3 for

Tap water treatments. Then determine the initial weights of the plastic strips in grams using the

Analytical balance and then record in a logbook. Three aluminum trays (7”x9”) were labeled C1,

C2, and C3. Five hundred grams of compost soil were measured using a weighing scale and

placed in each tray. Another three aluminum trays (7”x9”) were labeled L1, L2 and L3. Five

hundred grams of loam soil were placed in 3 each tray. One hundred mL of tap water were

mixed with the soils. Plastic strips labeled C1, C2 and C3 were placed in trays labeled C1, C2

and C3 containing compost soils. Plastic strips L1, L2 and L3 were placed in trays L1, L2 and L3

containing loam soils. Five hundred mL of seawater were placed each in three glass jars. The

jars were labeledS1, S2 and S3. In another three jars, 500mL of tap water were placed. The jars

were labeled T1, T2 and T3. Plastic strips labeled S1, S2 and S3 were placed in jars containing

seawater while plastic strips T1, T2 and T3 were placed in jars containing tap water.

Based on the data gathered from the TABLE 1- Percent weight loss in SM plastic strips

exposed to different substrates after 68 days exposure period, the results are the following:

DFFERENT SUBSTRATEMEAN
a.Compost Soil18.28
b.Loam Soil8.70
c.Tap water3.80
d.Salt water19.74
TOTAL:12.63

Analytical tests showed that Loam, Tap, Salt are the one who show that there are thinning

in some portions of the plastic strip. Discoloration in some parts of the plastic strip. Tearing was

observed. Therefore this three substrate may be used to dispose plastics in advanced.

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ACKNOWLEDGEMENT

The researchers would like to extend their greatest thanks to almighty God for giving

the strength and the knowledge in doing this study. The researchers would also like to thank

those people who helped in the completion of the study .

To our teacher, Mr. Thomas Pedro Milanes who helped and guided us to make the

research papers. To our parents and family who extended their support and understanding

specially in financial support. Thank you very much!

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CHAPTER I: INTRODUCTION

I. Background of the Study

Official figures show that plastics make up around 25% of the garbage that Baguio City

churns out, while an independent survey conducted by Eco waste Coalition and Greenpeace on

the composition of discards on Baguio City in 2006 found that 51% were plastic bags,19%

sachets and junk food wrappers, 5% Styrofoam, 1% hard plastics,10% rubber, 13%

biodegradable wastes.

Biodegradable plastics are degradable plastics on which the degradation results from the

action of naturally occurring micro-organisms such as bacteria, fungi, and algae. These plastics

are broken down into water, carbon dioxide, methane and biomass primarily through enzymatic

action on microorganisms).Biodegradable will fully disintegrate in six months or less. It turns

into powder and blends with the soil after a few months.

Many biodegradable plastics will decompose in industrial plants, backyard compost piles,

or open environments. The inherent biodegradability of...
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