The effects of ultrasound and electrocoagulation on removal of manganese from wastewater

Authors

  • Hana Posavčić Center of Faculty of Civil Engineering, Ul. Sveti Duh 129, 10000, Zagreb, Croatia http://orcid.org/0000-0001-6555-482X
  • Dražen Vouk Water Research Department, Faculty of Civil Engineering, University of Zagreb, Fra Andrije Kacica-Miosica 26, 10000 Zagreb, Croatia http://orcid.org/0000-0002-1458-7768
  • Ivan Halkijević Water Research Department, Faculty of Civil Engineering, University of Zagreb, Fra Andrije Kacica-Miosica 26, 10000 Zagreb, Croatia http://orcid.org/0000-0003-0694-3993

Keywords:

Electrocoagulation, Manganese removal, Ultrasound, Wastewater treatment

Abstract

In this paper the effects of ultrasound and electrocoagulation on removal of manganese from wastewater is studied. Manganese is common in industrial and metallurgical wastewaters, as well as in groundwater supplies, and its higher concentrations represent an increased risk of aquifer pollution. It was shown that 20 kHz ultrasound alone is not very efficient for manganese removal, but it enhances the efficiency of electrocoagulation. It was also shown that settling has a great effect on the electrocoagulation process because it stabilizes the flocs. Totally, four experiments on a laboratory scale were conducted and the optimal one included 10 minutes of ultrasound and 10 minutes of electrocoagulation using iron electrodes. Under these conditions 89.0 % of manganese was removed with operational costs of 0.13 EUR/mg Mn. Further, by including the cost of immersed ultrasound probe replacement, total operational costs increased up to 3000 times, making immersed ultrasound process unprofitable for a large-scale application. 

Downloads

Published

2022-12-17

Issue

Engineering Review, Vol. 42, No. 2

Section

Articles

License

Engineering review uses the Creative Commons Attribution-NonCommercial-NoDerivatives (CC-BY-NC-ND) 4.0 International License, which governs the use, publishing and distribution of articles by authors, publishers and the wider general public.

The authors are allowed to post a digital file of the published article, or the link to the published article (Enginering Review web page) may be made publicly available on websites or repositories, such as the Author’s personal website, preprint servers, university networks or primary employer’s institutional websites, third party institutional or subject-based repositories, and conference websites that feature presentations by the Author(s) based on the published article, under the condition that the article is posted in its unaltered Engineering Review form, exclusively for non-commercial purposes.

The journal Engineering Review’s publishing procedure is performed in accordance with the publishing ethics statements, defined within the Publishing Ethics Resource Kit. The Ethics statement is available in the document Ethics Policies.