Optimization of organic compounds removal from Wastewater by Electrocoagulation

AUTHORS

Mansooreh Dehghani 1 , Somayeh Sheibani Seresht 2 , Mohammad Mehdi Taghizadeh 3 , *

AUTHORS INFORMATION

1 Associate Professor Department of Environmental Health Engineering, Shiraz University of Medical Sciences, Shiraz, Iran.

2 MSc of Department Environmental Health Engineering, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.

3 Professor Department of Environmental Engineering, Islamic Azad University, Estahban Branch, Estahban, Iran.

ARTICLE INFORMATION

Hormozgan Medical Journal: 19 (1); e87426
Published Online: November 27, 2012
Article Type: Research Article
Received: August 13, 2012
Accepted: November 27, 2012

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Abstract

Introduction: As the most hazardous sewage, hospital wastewater contains various
contaminants, and its uncontrolled discharge can seriously damage the environment.
Bandar Abbas is located in an arid and semi-arid region; therefore, hospital wastewater
should be treated through an appropriate and economic method. This study aimed to
determine the efficiency of electrocoagulation with aluminum and iron electrodes in
removal of COD from wastewater of Shahid Mohammadi Hospital of Bandar Abbas.
Methods: This analysis was performed in laboratory-scale through an incoherent method
using a reactor which contained iron and aluminum binary and quaternary electrodes. A
total of 55 samples of raw sewage of the hospital were examined and a total of 216
samples were analyzed to determine the parameters which were effective in the process.
Samples (3 L) were immediately transferred to the laboratory after collection. COD
removal was performed through electrocoagulation at pH 3, 7, and 11, voltages 10, 20,
and 30, and reaction times of 30, 45, and 60 min. The results were analyzed using SPSS
16 through analysis of covariance.
Results: The data showed better performance of electrodes at 2 cm apart rather than 3
cm. The COD removal efficiency was increased by 6.2% when pH was decreased from
11 to 3 at optimum voltage of 30 V and reaction time of 60 min. The results showed that
by increasing the reaction time from 30 to 60 min at voltages 10, 20 and 30, the efficiency
of COD removal increased from 32.3% to 87.1%. Therefore, the highest efficiency of
COD removal (87.1%) was obtained at optimal pH of 3, voltage of 30 V, and reaction
time of 60 min with iron quaternary electrode.
Conclusion: Given the high efficiency of electrocoagulation as well as its simplicity and
relatively low cost, it can be used for removal of COD from hospital wastewater.

Keywords

Hospital - Wastewater – Electrocoagulation

© 2015, Hormozgan Medical Journal. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.
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