4.8 Article

Characterization of simultaneous ammonium and nitrate removal and microbial communities in airlift reactor using 3-hydroxybutyrate-co-3-hy-droxyvalerate (PHBV) as carbon source and biofilm carrier

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BIORESOURCE TECHNOLOGY
卷 393, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2023.130049

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SND (simultaneous nitrification and; denitrification); Salinity; Particle size distribution; Microbial community; RAS effluent treatment

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This study established a method for simultaneous nitrate and ammonium removal using an airlift sequencing batch reactor with 3-hydroxybutyrate-co-3-hydroxyvalerate as carbon source and biofilm carrier. The results showed high removal rates of nitrate and ammonia nitrogen with no significant nitrite accumulation.
As a novel trend, solid carbon sources are applied to act as electron donors and biofilm carrier in biological denitrification process. In this study, simultaneous nitrate and ammonium removal process in an airlift sequencing batch reactor using 3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) as carbon source and biofilm carrier under intermittent aeration conditions was established to treat effluent of synthetic marine recirculating aquaculture system. The results showed that maximum nitrate and ammonia nitrogen removal rates of 0.45 and 0.09 kg m- 3 d-1 were achieved. No significant nitrite accumulation was found during 200-day operation, while effluent dissolved organic carbon accumulation and particle size reduction significantly increased. Microbial community analysis and batch tests illuminate that the generated sludge and attached biofilm played important roles in nitrogen removal. This study demonstrates the potential mechanism for the nitrogen removal process mediated by 3-hydroxybutyrateco-3-hydroxyvalerate and provide a new idea for the alternative solutions of solid carbon sources.

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