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Electrocoagulation Sludge Valorization—A Review

Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
Author to whom correspondence should be addressed.
Academic Editor: Eveliina Repo
Resources 2021, 10(12), 127;
Received: 14 October 2021 / Revised: 30 November 2021 / Accepted: 9 December 2021 / Published: 14 December 2021
(This article belongs to the Special Issue Metal Recovery from the Secondary Resources)
In the field of electrocoagulation (EC), various studies on pollutant removal and on the use of different EC technologies have already been made. An EC process generates sludge, which is considered waste, resulting in increased operational costs that come from waste disposal. Sludge contains valuable materials, such as the nutrients or metals removed during water purification, along with metals, such as aluminum or iron, which come from the electrodes used in an EC system. Based on the principles of circular economy or based on existing legislations, reducing the production of valuable wastes, and increasing the valorization rate of as many materials as possible are important endeavors. This study is mainly a review of the existing sludge valorization studies. This review highlights the valorization of sludge as a fertilizer (mainly as struvite), pigment, construction material (mainly as blocks), adsorbent, and catalyst. While it has already been found that EC sludge is valorizable, more studies on EC sludge valorization and on the quality of sludge produced from the effluent of EC processes are warranted. View Full-Text
Keywords: electrocoagulation sludge; valorization; adsorbent; pigment; construction material; catalyst electrocoagulation sludge; valorization; adsorbent; pigment; construction material; catalyst
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MDPI and ACS Style

Rajaniemi, K.; Tuomikoski, S.; Lassi, U. Electrocoagulation Sludge Valorization—A Review. Resources 2021, 10, 127.

AMA Style

Rajaniemi K, Tuomikoski S, Lassi U. Electrocoagulation Sludge Valorization—A Review. Resources. 2021; 10(12):127.

Chicago/Turabian Style

Rajaniemi, Kyösti, Sari Tuomikoski, and Ulla Lassi. 2021. "Electrocoagulation Sludge Valorization—A Review" Resources 10, no. 12: 127.

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