University of Oulu

Virpiranta, H., Okyere Abayie, S., Mäkikangas, J., Puirava, M., Koivula, K., & Leiviskä, T. (2023). Treatment of fish processing plant wastewater using dissolved air flotation and pilot-scale biochar column filtration. Journal of Environmental Chemical Engineering, 11(5), 110853.

Treatment of fish processing plant wastewater using dissolved air flotation and pilot-scale biochar column filtration

Saved in:
Author: Virpiranta, Hanna1; Okyere Abayie, Samuel1; Mäkikangas, Jarmo2;
Organizations: 1University of Oulu, Chemical Process Engineering, P.O. Box 4300, 90014 Oulu, Finland
2University of Oulu, Kerttu Saalasti Institute, Pajatie 5, 85500 Nivala, Finland
3Iin Micropolis Oy, Piisilta 1A, 91100 Ii, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.5 MB)
Persistent link:
Language: English
Published: Elsevier, 2023
Publish Date: 2023-08-29


Wastewaters from fish processing cause a high organic load for municipal wastewater treatment and can interfere with treatment operations due to their high oil and grease content. In the present study, a modular dissolved air flotation (DAF) unit was used to remove oil, grease and other suspended solids from fish processing plant wastewater. After DAF treatment, the residual particles and nutrients were adsorbed onto a mixture of hemp and spruce biochar in a pilot-scale column filtration system. The proposed integrated treatment process aims to improve the quality of the fish processing wastewater, facilitate water reuse, and recover the dissolved nutrients in a reusable form. The DAF treatment removed nearly all the oil and grease from the wastewater. Also, chemical oxygen demand, turbidity and phosphorus concentration clearly decreased during the DAF process. The biochar filtration further clarified the DAF-treated wastewater and partly adsorbed the residual nutrients. Furthermore, in the spent biochar mixture, the nitrogen and phosphorus content increased significantly (N to 9.1–10.5 mg/g, P to 0.32–1.38 mg/g), which indicates the improved properties of the biochar as a possible soil conditioner.

see all

Series: Journal of environmental chemical engineering
ISSN: 2213-2929
ISSN-E: 2213-3437
ISSN-L: 2213-2929
Volume: 11
Issue: 5
Article number: 110853
DOI: 10.1016/j.jece.2023.110853
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: This work was supported by the Centre for Economic Development, Transport and the Environment (South Ostrobothnia) (Grant ID EPOELY/1324/2021), Laitakarin Kala Oy, Hätälä Oy, Owatec Group Oy and Ii Waterworks.
Copyright information: © 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (