Removal of total arsenic in simulated irrigation water using electrocoagulation
Date of Publication
2015
Document Type
Bachelor's Thesis
Degree Name
Bachelor of Science in Chemical Engineering
Subject Categories
Chemical Engineering
College
Gokongwei College of Engineering
Department/Unit
Chemical Engineering
Thesis Adviser
Leonila C. Abella
Pag-asa D. Gaspillo
Defense Panel Chair
Michelle Almendrala
Defense Panel Member
Susan Manalastas Gallardo
Wilheliza A. Baraoidan
Abstract/Summary
Arsenic (As) is one of the most toxic substances in the environment. Reports show that there is arsenic contamination in rice paddy soils in the Philippines. Some of these areas are in Bae, Laguna (15.49 ppm), Milaor, Camarines Sur (9.23 ppm) and Sipalay City, Negros Occidental (11.44 ppm). Irrigation water in Bae, Laguna contained 17 ppb Arsenic which is higher than the World Health Organization (WHO) standard for agricultural water. These demonstrate the need to prevent Arsenic contamination into the soil and groundwater which could be deposited and absorbed in food crop. Electrocoagulation is an efficient method used to remove dissolved heavy metals, such as Arsenic, in water. The focus of the study was on the effects of current density (3.0, 12.3 and 28.8 A/m²), electrode distance (16, 25 and 34 mm) and flow rate (0.4, 1.0 and 2.0 L/min) on the removal of total Arsenic using bench-scale, 18-L, cylindrical, electrocoagulation phase. Experimental runs for both phases were conducted based on the Taguchi Design of Experiments. For the pre-electrocoagulation phase, results show that the initial concentration of Arsenic for electrocoagulation increased with increasing flowrate. Among the parameters, it was found out that the electrode distance had the best correlation with an R² value of 0.9894 and a P-value of 0.547. For the electrocoagulation phase, a current density of 3 A/m², electrode distance 34 mm, and flow rate of 2 L/min gave the best electrocoagulation rate which gave an Arsenic removal of ˃95%.
Abstract Format
html
Language
English
Format
Accession Number
TU20070
Shelf Location
Archives, The Learning Commons, 12F, Henry Sy Sr. Hall
Physical Description
108 leaves, illustrations (some color), 28 cm.
Keywords
Arsenic wastes; Soils—Heavy metal content; Electrocoagulation
Recommended Citation
Laohoo, J. C., & Vallar, P. B. (2015). Removal of total arsenic in simulated irrigation water using electrocoagulation. Retrieved from https://animorepository.dlsu.edu.ph/etd_bachelors/5535
Embargo Period
5-2-2021