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<p>Polyhydroxybutyrate (PHB), a biodegradable polyester, exhibits unique advantages in biosynthesis, degradability, and plastic-like physical properties, making its research and application of great significance. In this study, artificially prepared simulated wastewater was used as influent, with inoculated sludge acclimated for salt tolerance from a municipal wastewater treatment plant. Three parallel sequencing batch reactors (SBRs) were operated at carbon-to-nitrogen ratios (C/N) of 1, 3, and 5 to investigate pollutant removal efficiency and its impact on PHB synthesis. Key findings are as follows: (1) The effect of C/N on pollutant removal varied by indicator: a high C/N (5) promoted ammonium nitrogen and total phosphorus (TP) removal but inhibited total organic carbon (TOC) removal due to deteriorated sludge settleability; a moderate C/N (3) showed optimal comprehensive performance in pollutant removal and system stability. (2) Microbial genera acclimated under low C/N conditions exhibited stronger growth capacity, while those under high C/N conditions showed superior PHB synthesis capability. (3) PHB synthesis increased significantly by 64.7% when C/N increased from 1 to 3, but the growth rate slowed to 9.0% when C/N further increased to 5, indicating a threshold effect.</p>

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Effects of C/N on PHB production, resource recovery, and microbial communities in high-salinity wastewater via SBR

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Min Ren,
  • Huining Zhang,
  • Xingnan Guo,
  • Dongxia Zhang,
  • Shuting Zhang,
  • Bixiao Ji,
  • Xiaodong Yang

摘要

Polyhydroxybutyrate (PHB), a biodegradable polyester, exhibits unique advantages in biosynthesis, degradability, and plastic-like physical properties, making its research and application of great significance. In this study, artificially prepared simulated wastewater was used as influent, with inoculated sludge acclimated for salt tolerance from a municipal wastewater treatment plant. Three parallel sequencing batch reactors (SBRs) were operated at carbon-to-nitrogen ratios (C/N) of 1, 3, and 5 to investigate pollutant removal efficiency and its impact on PHB synthesis. Key findings are as follows: (1) The effect of C/N on pollutant removal varied by indicator: a high C/N (5) promoted ammonium nitrogen and total phosphorus (TP) removal but inhibited total organic carbon (TOC) removal due to deteriorated sludge settleability; a moderate C/N (3) showed optimal comprehensive performance in pollutant removal and system stability. (2) Microbial genera acclimated under low C/N conditions exhibited stronger growth capacity, while those under high C/N conditions showed superior PHB synthesis capability. (3) PHB synthesis increased significantly by 64.7% when C/N increased from 1 to 3, but the growth rate slowed to 9.0% when C/N further increased to 5, indicating a threshold effect.