Issue 9, 2019

Organic contaminants of emerging concern in Norwegian digestates from biogas production

Abstract

The aim of this study was to analyze a variety of environmental organic contaminants of emerging concern (CEC) and their metabolites in representative digestate samples from Norwegian biogas production plants. Biogas digestates can be a valuable source for soil amendments and/or fertilizers in commercial agriculture. It is important to assess whether the digestates contain harmful contaminants in order to avoid unintended exposure of human consumers. In total 19 biogas digestates from 12 biogas production plants in Norway were collected and analyzed. Furthermore, process related parameters such as pretreatment of substrates, additives, flocculation and temperature conditions were considered for interpretation of the results. The CEC levels found in the digestates were shown to be dependent on the original composition of the substrate, dry-matter content, and conditioning of the substrate. The sunscreen octocrylene (147 μg L−1) and acetaminophen (paracetamol; 58.6 μg L−1) were found at the highest concentrations in liquid digestates, whereas octocrylene (>600 ng g−1, on a wet weight basis = ww) and the flame retardant TCPP (tris(1-chloro-2-propyl) phosphate, >500 ng g−1 ww) were found at the highest levels in solid digestates, exceeding even the upper limit of quantification (uLOQ) threshold. The highest levels of total CECs were measured in solid digestates (1411 ng g−1 ww) compared to liquid digestates (354 μg L−1 equals 354 ng g−1). The occurrence of CECs in digestate samples, even after extensive and optimized anaerobic digestion, indicates that the operational conditions of the treatment process should be adjusted in order to minimize CEC contamination.

Graphical abstract: Organic contaminants of emerging concern in Norwegian digestates from biogas production

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr. 2019
Accepted
10 Jūn. 2019
First published
01 Jūl. 2019
This article is Open Access
Creative Commons BY-NC license

Environ. Sci.: Processes Impacts, 2019,21, 1498-1508

Organic contaminants of emerging concern in Norwegian digestates from biogas production

A. M. Ali, A. S. Nesse, S. Eich-Greatorex, T. A. Sogn, S. G. Aanrud, J. A. Aasen Bunæs, J. L. Lyche and R. Kallenborn, Environ. Sci.: Processes Impacts, 2019, 21, 1498 DOI: 10.1039/C9EM00175A

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