A1 Journal article (refereed)
Increased sulfate availability in saline water promotes hydrogen sulfide production in fish organic waste (2020)

Letelier-Gordo, C. O., Aalto, S. L., Suurnäkki, S., & Pedersen, P. B. (2020). Increased sulfate availability in saline water promotes hydrogen sulfide production in fish organic waste. Aquacultural Engineering, 89, 102062. https://doi.org/10.1016/j.aquaeng.2020.102062

JYU authors or editors

Publication details

All authors or editors: Letelier-Gordo, Carlos O.; Aalto, Sanni L.; Suurnäkki, Suvi; Pedersen, Per Bovbjerg

Journal or series: Aquacultural Engineering

ISSN: 0144-8609

eISSN: 1873-5614

Publication year: 2020

Volume: 89

Pages range: 102062

Publisher: Elsevier

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.aquaeng.2020.102062

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/67955

Abstract

The risk of hydrogen sulfide (H2S) production can be a challenge in marine land-based recirculating aquaculture systems (RAS). Hydrogen sulfide is a toxic gas that can cause massive fish mortality even at low concentrations, and in addition, serious odour problems in the surroundings. It is a bacterial by-product originating from the degradation of organic matter in sulfur-rich waters such as marine waters. In order to hinder H2S production in marine land-based RAS, more information on the H2S production conditions and the associated microbiology is needed. In this study, the production of H2S from rainbow trout (Oncorhynchus mykiss) organic waste was examined using a novel H2S measurement method under a range of salinities (0, 5, 10, 15, 25 and 35 g/L) in anaerobic mixed reactors, and the microbial communities as well as abundance of sulfate reducing bacteria (SRB) were characterized. The maximum H2S concentration increased from 23.1 ± 8.2 mg H2S/L at 0 g/L salinity to 153.9 ± 34.1 mg H2S/L at 35 g/L salinity. Similarly, the H2S production rate increased from 5.6 ± 0.2 at 0 g/L salinity to 26.4 ± 12.7 mg of H2S produced per day at 35 g/L salinity. The highest H2S production was recorded after increased availability of volatile fatty acids, which were produced by fermentative bacteria from phyla Firmicutes and Bacteroidetes that dominated the microbial communities after day 5. The traditional sulfate reducing bacteria (SRB) were found only at 0 and 5 g/L salinity, while at higher salinities, H2S production was carried out by novel unquantifiable SRB. The results demonstrate that H2S can be a pronounced problem in marine RAS, although it can be controlled through preventing anaerobic conditions within the system.

Keywords: hydrogen sulphide; organic material; seawater; sulfates

Free keywords: hydrogen sulfide; organic matter; seawater; sulfate; sulfate reducing bacteria

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1