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

Print

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

Embargo Period

5-2-2021

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