Calcium and silica removal from water in evaporative cooling systems, using precipitation and electrocoagulation

One of the main problems of evaporative cooling systems is incrustation, mainly caused by calcium (Ca) and silica (SiO2), present in raw water or make up water. Its elimination might be complicated and expensive due to the use of specialized personnel and equipment. In this paper, removal of both Ca...

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Bibliographic Details
Published in:	Desalination and water treatment Vol. 245; pp. 106 - 115
Main Authors:	Casillas, Héctor Aurelio Moreno, Carrillo, María Cristina García, Hernandez, Adriana Gamboa, Vázquez Rueda, Martin G.
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 01-01-2022
Subjects:	Electrocoagulation Evaporative cooling systems Scaling Scaling Electrocoagulation Evaporative cooling systems
Online Access:	Get full text
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Summary:	One of the main problems of evaporative cooling systems is incrustation, mainly caused by calcium (Ca) and silica (SiO2), present in raw water or make up water. Its elimination might be complicated and expensive due to the use of specialized personnel and equipment. In this paper, removal of both Ca and SiO2 using precipitation and electrocoagulation (EC) is evaluated. First, individual tests for precipitation and EC were made, followed by batch combined precipitation and EC tests. Last, a 23 experimental design was used to evaluate the effect of three factors; the direct current voltage applied (DCV), flow, and reactor configuration. The obtained results are encouraging, with just 5 min of residence time for precipitation and 2 min for EC, the achieved removal efficiency for both Ca and SiO2 were higher than 91%.
ISSN:	1944-3986 1944-3986
DOI:	10.5004/dwt.2022.27946