在低和中等有机载荷率下,从污水污泥无氧发酵液中生产有氧聚酸酸盐的氧气限制
Marco Gottardo1, Silvia Zanatta2, Michele Modesti3
1Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Via Torino 155, 30170 Mestre-Venice, Italy.
Chemosphere
|July 13, 2023
概括
这项研究优化了从污水污泥中微生物多酸酸盐 (PHA) 的产生. 在氧气限制下较低的有机载荷率提高了PHA的储存,改善了聚合物特性,降低了能源成本.
科学领域:
- 环境微生物学 环境微生物学
- 生物技术是生物技术.
- 聚合物科学 聚合物科学
背景情况:
- 聚酸酸盐 (PHA) 是一种可生物降解的聚合物,具有多种应用.
- 污水污泥是微生物PHA生产的丰富且低成本基质.
- 优化PHA生产需要了解运营参数的影响,如有机载荷率 (OLR) 和氧气可用性.
研究的目的:
- 在氧气限制下研究OLR对PHA储存生物质选择,动力学和聚合物特性的试点影响.
- 评估从热预处理的污水污泥中生产PHA的可行性.
- 为了比较低和高溶氧 (DO) 方案下产生的PHA特性.
主要方法:
- 采用了一种测序批量反应堆 (SBR),用于生物质丰富,具有短的液压保留时间 (HRT).
- 在PHA积累期间应用受控的OLR和有限的氧气条件.
- 分析了PHA含量,储存产量,聚合物特性 (热稳定性,结晶性) 和质量平衡.
主要成果:
- 在低OLR (2.05gCOD/L·d) 和有限的氧气条件下成功选择了PHA储存生物质.
- 在优化条件下,在细胞干量上达到51%的PHA含量和0.61COD_PHA/COD_S的储存产量.
- 与高DO条件相比,在低DO条件下产生的PHA具有更高的热稳定性和结晶性.
- 获得了51gPHA/kgVS的总产量,同时降低了能源成本.
结论:
- 在氧气限制下,低OLR有效地从污水污泥中选择高效的PHA生产微生物联盟.
- 这种方法产生了具有增强性质的PHA,并为具有成本效益的生物聚合物生产提供了潜力.
- 该研究表明,从废物流中制造可持续PHA的可行试点规模工艺.
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