Abstract
Ammonium sulfate wastewater can cause eutrophication and black odor of water body. Although ammonia nitrogen can be used as nutrient of microalgae, high ammonia nitrogen levels could inhibit the growth of microalgae. Nitrobacteria can transform ammonia nitrogen into nitrate nitrogen. In this study, mono Chlorella pyrenoidosa culture (mono-C.py), synchronous mixed culture (mixed-a), and asynchronous mixed culture (mixed-b) systems were examined for their ability to treat ammonium sulfate wastewater. Nitrogen removal rate of mixed-b at the end of culture (52.96%) was higher than that of the mono-C.py (46.37%) and the mixed-a (39.11%). Higher total suspended solid concentration (2.40 g/L), crude protein yield (0.76 g/L), and heating value yield (35.73 kJ/L) were obtained in mixed-b, meanwhile with excellent settlement performance (91.43 ± 0.51%). Mechanism analysis of settlement showed that the relative abundance of floc-forming-related bacteria Sphingopyxis and Acidovorax were increased generally, while nitrification/denitrifying members were decreased in mixed-b along with the culture proceeding.
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This work was supported by the National Natural Science Foundation of China (51861145103 and 21878291); the Science and Technology Planning Project of Guangzhou (202102080406); the Natural Science Foundation for Research Team of Guangdong Province (2016A030312007).
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LQ and SF carried out the experiments and wrote the manuscript. PF analyzed the data. ZW and SZ supervised the experimental work and revised the manuscript.
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Qin, L., Feng, S., Feng, P. et al. Treatment of Synthetic Ammonium Sulfate Wastewater by Mixed Culture of Chlorella pyrenoidosa and Enriched Nitrobacteria. Curr Microbiol 78, 3891–3900 (2021). https://doi.org/10.1007/s00284-021-02646-y
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DOI: https://doi.org/10.1007/s00284-021-02646-y