RESEARCH DEFENSE

Question 1

Abstract

Answer 1

The Guimaras oil spill of 2006 was the worst environmental tragedy in the Philippines (Murga, 2019). Problem on creating spill booms made of organic materials was one of the challenges the province had encountered. Meanwhile, massive mango (Mangifera indica) propagation in Guimaras produces thousands of seed husks which are
considered as wastes. In this study, the adsorption capacity of mango seed husks on the different types of used oil was evaluated. The seed husks were weighed and placed inside the screen cases. Each treatment has three replicates. Treatment 1 - 200 mL used cooking
oil + 600 mL seawater with 25 grams mango seed husks, Treatment 2 - 200 mL used engine oil + 600 mL seawater with 25 grams mango seed husks, Treatment 3 - 200 mL
crude oil + 600 mL seawater with 25 grams mango seed husks, and Treatment 4 - 200 mL used cooking oil + 600 mL seawater, 200 mL used engine oil + 600 mL seawater,
and 200 mL crude oil + 600 mL seawater with 25 grams of polypropylene each concentration (positive control). After immersing for 24 hours, remaining volume of used
oils were measured to determine the volume of the oil adsorbed by the treatments. Results showed that Treatment 4 adsorbed the greatest amount of used oil (x̄ = 138.0),
followed by Treatment 3 (x̄ = 113.3), Treatment 2 (x̄ = 109.3), and Treatment 1 (x̄ = 85.3). It was demonstrated that mango seed husk can adsorb different types of used oil.

Question 2

Keywords:(5)

Answer 2

Mangifera indica, mango seed husks, adsorption, used oil, polypropylene

Question 3

Adding of adsorbent materials inside the screen case

Answer 3

The measured mango seed husks and polypropylene were placed inside their designated screen cases. After doing so, the top part of the casing was sewn close using
the nylon thread.

Question 4

Preparation of different type of used oil and seawater

Answer 4

A graduated cylinder was used to measure 200 mL of used cooking, engine, and crude oil and 600 mL seawater each treatment. After that, the measured used oil was placed inside the identical containers after placing the seawater inside the basins.

Question 5

Immersing the adsorbent materials

Answer 5

The initial volume of each container was measured and recorded before each treatment and the replicate was immersed in the corresponding basins with different concentrations of used cooking oil, used engine oil, and crude oil with seawater. A stirring rod was used to help the immersion of sorbents. The adsorbents were taken from each container after 24 hours. This procedure followed the completely randomized design.

Question 6

Conclusion 1st paragraph

Answer 6

It was demonstrated that Mangifera indica seed husks can adsorb different types of used oil. The greater the viscosity of the type of oil, the greater the volume of used oil adsorbed. Thus, it requires fibrous sorbent materials for an effective oil spill clean-up. This led to the idea of utilizing the Mangifera indica seed husks as a natural oil adsorbent in remediation to various oil contamination.