Date of Publication

3-2023

Document Type

Master's Thesis

Degree Name

Master of Science in Chemical Engineering

Subject Categories

Chemical Engineering

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Thesis Advisor

Aileen H. Orbecido
Carlito B. Tabelin

Defense Panel Chair

Lawrence P. Belo

Defense Panel Member

Vergel C. Bungay
Arnel B. Beltran


Abstract/Summary

Acid Mine Drainage (AMD) is a problem found in different water bodies due to their low pH and high concentration of metals. Different materials have been studied to treat this, including locally available materials such as limestone, low-grade ores, concrete wastes, and fly ash. Previous studies have shown that individually, they have the potential to treat AMD due to their ability to generate alkalinity, however with some limitations. To address this, a mixed media approach on the four materials was used to increase the pH and remove metals (Fe, Cu, Al, Mn, and Ni), and sulfates. After characterization of the individual materials using SEM-EDS, XRF, and XRD, twenty (20) mixed media compositions were identified to create a statistical model following a response surface methodology mixture optimization design of experiment. A ratio of 0.75 mL of synthetic AMD per gram of media was used throughout the laboratory-scale experimental runs, following the study of Turingan et al. (2020a). Overall, runs using mixed media were able to address all parameters except for sulfates. Using this data, mixed media composition was optimized to have the treated AMD meet the Philippine effluent standards. A total of three optimized mixed media compositions were identified in wt%: (1) 43% LGO, 40% Limestone, 17% CW, (2) 44% LGO, 51% Limestone, 6% CW, and (3) 89% Limestone, 11% LGO. Overall, these mixed media compositions were able to meet effluent standards, except for sulfates which have increased in concentration. Generally, the mechanism involved in removing the pollutants is by sorption following further analysis through geochemical modelling.

Abstract Format

html

Language

English

Format

Electronic

Keywords

Acid mine drainage—Purification; Neutralization (Chemistry)

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Embargo Period

4-23-2024

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