Date of Publication
5-2022
Document Type
Dissertation/Thesis
Degree Name
Master of Science in Environmental Engineering and Management
College
Gokongwei College of Engineering
Department/Unit
Chemical Engineering
Thesis Advisor
Dr. Aileen H. Orbecido
Dr. Michael Angelo B. Promentilla
Dr. Carlito B. Tabelin
Defense Panel Chair
Dr. Arnel B. Beltran
Defense Panel Member
Dr. John Frederick D. Tapia
Dr. Kathleen B. Aviso
Abstract/Summary
The Philippines is one of the most mineralized countries in the world. However, despite its positive impact on the economy, the production of acid mine drainage (AMD) due to extensive mining has caused detrimental effects on the environment. AMD occurs when pyrite and other sulfide minerals are exposed to air, microbial activities, and water. It is estimated that 1 mole of pyrite can produce at most 16 moles of hydronium ions, making the surrounding environment highly acidic. To this date, several efforts and treatment technologies have been proposed to manage the negative impacts of AMD. However, little effort has been made over the years to develop a generalized framework for the selection of the optimum treatment technology. The technology selection process involves systematic evaluation based on multiple but often conflicting criteria. This study proposed the use of the Spherical Fuzzy Analytic Hierarchy Process (SFAHP) as a Multi-Criteria Decision Analysis (MCDA) tool to select the optimum active treatment technology for AMD. Three treatment technologies were considered: 1) combination of conventional lime neutralization and sulfidogenic bioreactor (CLN + SB); 2) high-density sludge (HDS) process; 3) combination of two-step neutralization ferrite formation and sulfidogenic bioreactor (TSNFF + SB). The alternatives were evaluated using three criteria – technical aspect, economic aspect, and environmental aspect – and eight sub-criteria – robustness, ease of operation, ease to upgrade, CAPEX, OPEX, effluent quality, sludge production, and resource recovery. The analysis showed that the decision-makers have the highest importance for the environmental aspect when selecting a treatment technology. Aggregation of individual judgments and individual priorities yielded the same ranking: TSNFF + SB > HDS > CLN + SB. One-at-a-time sensitivity analysis was also done. Results indicated that the level of importance of the TSFNN + SB is largely attributed to the high level of importance given to the environmental aspect. A comparative study was also done by comparing the result with the obtained ranking from classical AHP. Both methods gave the highest score for TSNFF + SB but different rankings when equal weights were given for the criteria.
Abstract Format
html
Language
English
Recommended Citation
Lorio, C. (2022). SELECTION OF OPTIMUM ACTIVE TREATMENT TECHNOLOGY FOR ACID MINE DRAINAGE (AMD) USING SPHERICAL FUZZY ANALYTIC HIERARCHY PROCESS (SFAHP). Retrieved from https://animorepository.dlsu.edu.ph/etdm_chemeng/7
Upload Full Text
wf_yes
2022_Lorio_PagesWithSignature
2022_Lorio_Abstract.pdf (179 kB)
2022_Lorio_Abstract
2022_Lorio_PreliminaryPages.pdf (191 kB)
2022_Lorio_PreliminaryPages
2022_Lorio_Chapter 1.pdf (197 kB)
2022_Lorio_Chapter 1
2022_Lorio_Chapter 2.pdf (1229 kB)
2022_Lorio_Chapter 2
2022_Lorio_Chapter 3.pdf (1660 kB)
2022_Lorio_Chapter 3
2022_Lorio_Chapter 4.pdf (777 kB)
2022_Lorio_Chapter 4
2022_Lorio_Chapter 5.pdf (2280 kB)
2022_Lorio_Chapter 5
2022_Lorio_Chapter 6.pdf (168 kB)
2022_Lorio_Chapter 6
2022_Lorio_List of References.pdf (270 kB)
2022_Lorio_List of References
2022_Lorio_Appendices.pdf (2509 kB)
2022_Lorio_Appendices
Embargo Period
6-13-2022
