Abstract
Geosmin and 2-methylisoborneol (MIB) are two of the most common odorous compounds that critically affect the quality of fish. In the current study, the solid fish waste from a recirculating aquaculture system (RAS) was used as the substrate to produce bioflocs in suspended growth reactors (SGRs). The removal efficiency of geosmin and MIB by the bioflocs was investigated under in situ and in vitro conditions. The highest removal rates for geosmin and MIB in the SGRs were 187.00 ± 0.23 and 170.91 ng L−1 d−1, respectively. Under the in vitro experimental conditions, 90.30 % of the geosmin and 72.93 % of the MIB were removed from the aqueous phase by the bioflocs within 48 h of incubation. It was found that the decay of these odorous compounds by the bioflocs was mediated by both chemical/physical sorption and biological degradation. Moreover, the addition of these odorous compounds did not affect the treatment efficiency of the reactors and had no adverse influence on the crude protein content of the bioflocs. Thus, using biofloc technology (BFT), SGRs can be used to reuse the nitrogen in fish waste and to remove geosmin and MIB from the culture water efficiently.
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Acknowledgments
This study was funded by the National Nature Science Foundation of China (Project 31202033), the Shanghai Ocean University graduate thesis excellent incubator program, and Shanghai Municipal Agricultural Commission (Huchankezi [2014] No. 5). We thank the anonymous reviewers and editors for their valuable comments and suggestions on this paper.
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Ma, N., Luo, G., Tan, H. et al. Removal of geosmin and 2-methylisoborneol by bioflocs produced with aquaculture waste. Aquacult Int 24, 345–356 (2016). https://doi.org/10.1007/s10499-015-9929-0
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DOI: https://doi.org/10.1007/s10499-015-9929-0