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首页> 外文期刊>RSC Advances >Temperature effect on extracellular polymeric substances (EPS) and phosphorus accumulating organisms (PAOs) for phosphorus release of anaerobic sludge
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Temperature effect on extracellular polymeric substances (EPS) and phosphorus accumulating organisms (PAOs) for phosphorus release of anaerobic sludge

机译：对细胞外聚合物物质（EPS）和磷积累生物（PAOS）对厌氧污泥的磷释放的温度影响

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摘要

Phosphorus (P) is an essential element for living organisms and anaerobic sludge is an attractive source for P recovery. Anaerobic P release depends on both phosphorus-accumulating organisms (PAOs) and extracellular polymeric substances (EPS). However, the P release contributed by the microbial cells and EPS was not addressed completely and the effect of temperature on the mechanism of P release and transformation was rarely considered. This study, therefore, investigated the effects of temperature on the P fraction and the relationship between PAOs metabolic pathway and EPS reaction using the Standards in Measurements and Testing (SMT) protocol and the P-31 nuclear magnetic resonance (P-31-NMR) experiments. Experimental results showed that the temperature not only affected the metabolism of PAOs, but also significantly influenced the EPS components and the hydrolysis of EPS-associated polyphosphate (poly-P). And the P release mainly occurred due to biological mechanisms with a conversion from non-reactive P (NRP) in both intracellular and extracellular substances to reactive P (RP) fractions. The highest concentration of total P in the supernatant (TPL) occurred at 15 degrees C, and the TPL release from the solid to liquid phase was better fitted with pseudo-second-order kinetic model. More organic P in the sludge (OPs) released from the sludge phase at 35 degrees C would convert into inorganic P (IPs) and non-apatite inorganic phosphorus (NAIP(s)) was the most labile P fraction for P release. The hydrolysis of EPS-associated poly-P was enhanced by higher temperatures with the degradation of the long-chain poly-P by PAOs. Meanwhile, a lower temperature could obviously improve the P release because the dominance of PAOs would potentially shift to GAOs with the increase of temperature. But the very-low temperature (5 degrees C) was not beneficial for the P release and suppressed the microbial activities.
机译：磷（P）是生物体的基本要素，厌氧污泥是P恢复的有吸引力的来源。厌氧P释放取决于磷积累生物（PAOS）和细胞外聚合物物质（EPS）。然而，不完全解决微生物细胞和EPS的P释放并且很少考虑温度对P释放和转化机制的影响。因此，该研究研究了温度对P级分的影响和使用测量和测试（SMT）方案的标准和PAOS代谢途径和EPS反应的关系的影响（P-31核磁共振（P-31-NMR）实验。实验结果表明，温度不仅影响了PAOS的代谢，还会显着影响EPS组分和EPS相关多磷酸盐（Poly-P）的水解。并且P释放主要是由于生物机制，在细胞内和细胞内物质中与非反应性P（NRP）转化为反应性P（RP）级分。上清液（TPL）中的最高浓度在15℃下发生，并且从固体中释放到液相的TPL释放，伪二阶动力学模型更好地配合。从35℃的污泥相释放的污泥（OPS）中的更多有机p将转化为无机P（IP）和非磷灰石无机磷（Naip）是P释放最不稳定的P级分。通过PAOS的长链多-P的降解，通过更高的温度提高EPS相关聚p的水解。同时，较低的温度明显改善P释放，因为PAOS的主导地位可能随着温度的增加而移动到GaOS。但是，低温（5℃）对P释放并抑制微生物活性并不有益。

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  • 来源
    《RSC Advances》 |2019年第4期|共10页
  • 作者

    Zeng Fanzhe; Jin Wenbiao; Zhao Qingliang;

  • 作者单位

    Harbin Inst Technol Sch Environm SKLUWRE Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Civil &

    Environm Engn Shenzhen 518055 Peoples R China;

    Harbin Inst Technol Sch Environm SKLUWRE Harbin 150090 Heilongjiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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