University of Oulu

Rajaniemi, K., Raulio, M., Tuomikoski, S., Lassi, U. (2019) Comparison of batch and novel continuous electrocoagulation processes in the treatment of paint industry wash water. Desalination and Water Treatment, 170: 394-404.

Comparison of batch and novel continuous electrocoagulation processes in the treatment of paint industry wash water

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Author: Rajaniemi, Kyösti1; Raulio, Mari2; Tuomikoski, Sari1;
Organizations: 1Research unit of Sustainable Chemistry, Faculty of Technology, University of Oulu, Erkki Koiso-Kanttilankatu 1, P.O. Box: 4300, FI-90014, Finland
2Tikkurila Oyj, P.O. Box: 53, FI-01301 Vantaa, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: Desalination Publications, 2019
Publish Date: 2019-12-18


Water is crucial to all life forms on earth. Still, millions of people are suffering because of lack of fresh water. One of the most important reasons is industrial pollution. That is why more effective and economical water treatment systems must be developed and studied worldwide. In this study, a new design of continuous electrocoagulation systems is introduced and compared with widely studied batch process systems. This novel design improves the controllability of water flow and electricity. In the treatment of paint industry wash water, a batch system and a novel continuous electrocoagulation system with an aluminum (Al) anode and an iron (Fe) cathode were used. Two parallel analyses of both processes were conducted, and the average efficiency of chemical oxygen demand and Al removal were 68% and 79.8% in batch and 69.7% and 62.1% in the continuous system, respectively. The number of microbes decreased by 99.6% in the batch and by 99.8% in the continuous system. The calculated operational costs in this experiment were 1.63 €/m³ for the batch and 1.19 €/m³ for the continuous system. The novel continuous electrocoagulation process was as efficient as the batch process in this study.

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Series: Desalination and water treatment
ISSN: 1944-3994
ISSN-E: 1944-3986
ISSN-L: 1944-3994
Volume: 170
Pages: 394 - 404
DOI: 10.5004/dwt.2019.24562
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: Kyösti Rajaniemi would like to thank Erkki Paasikiven säätiö for funding his study. Authors would like to thank Tikkurila Oyj Maintenance and Microbiological laboratory for skillful assistance and Ahma Ympäristö Oy for the chemical compounds analytics.
Copyright information: © 2019 Desalination Publications. This is an Accepted Manuscript of an article published in Desalination and Water Treatment, available online: