University of Oulu

Prokkola H, Heponiemi A, Pesonen J, Kuokkanen T, Lassi U. Reliability of Biodegradation Measurements for Inhibitive Industrial Wastewaters. ChemEngineering. 2022; 6(1):15.

Reliability of biodegradation measurements for inhibitive industrial wastewaters

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Author: Prokkola, Hanna1; Heponiemi, Anne1; Pesonen, Janne1;
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2022
Publish Date: 2022-04-25


Industrial wastewaters may contain toxic or highly inhibitive compounds, which makes the measurement of biological oxygen demand (BOD) challenging. Due to the high concentration of organic compounds within them, industrial wastewater samples must be diluted to perform BOD measurements. This study focused on determining the reliability of wastewater BOD measurement using two different types of industrial wastewater, namely pharmaceutical wastewater containing a total organic carbon (TOC) value of 34,000 mg(C)/L and industrial paper manufacturing wastewater containing a corresponding TOC value of 30 mg(C)/L. Both manometric respirometry and the closed-bottle method were used in the study, and the results were compared. It was found that the dilution wastewaters containing inhibitive compounds affected BOD values, which increased due to the decreased inhibiting effect of wastewater pollutants. Therefore, the correct BOD for effluents should be measured from undiluted samples, while the diluted value is appropriate for determining the maximum value for biodegradable organic material in the effluent. The accuracy of the results from the blank samples was also examined, and it was found that the readings of these were different to those from the samples. Therefore, the blank value that must be subtracted may differ depending on the sample.

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Series: ChemEngineering
ISSN: 2305-7084
ISSN-E: 2305-7084
ISSN-L: 2305-7084
Volume: 6
Issue: 1
Article number: 15
DOI: 10.3390/chemengineering6010015
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Copyright information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (