研究报告

  • 杨惠兰,张丹,兰书焕,李旭东,王臣,代碧莹,谢翼飞.聚己内酯复合固体碳源的制备及其深度脱氮性能研究[J].环境科学学报,2022,42(5):263-273

  • 聚己内酯复合固体碳源的制备及其深度脱氮性能研究
  • Preparation of polycaprolactone composite solid carbon source and its tertiary nitrogen removal
  • 基金项目:四川省环境治理与生态保护重大科技专项(No. 2019YFS0504);四川省重点研发项目(No. 2020YFS0021);中国科学院战略生物资源能力建设项目(No. KFJ-BRP-017-59);成都市重点研发支撑计划-技术创新研发项目(No. 2019-YF05-02155-SN);国家重点研发计划项目(No. 2017YFC0505105)
  • 作者
  • 单位
  • 杨惠兰
  • 中国科学院成都生物研究所,成都 610041;环境微生物四川省重点实验室,成都 610041;中国科学院大学,北京 100049
  • 张丹
  • 中国科学院成都生物研究所,成都 610041;环境微生物四川省重点实验室,成都 610041;中国科学院大学,北京 100049
  • 兰书焕
  • 中国科学院成都生物研究所,成都 610041;环境微生物四川省重点实验室,成都 610041;中国科学院大学,北京 100049
  • 李旭东
  • 中国科学院成都生物研究所,成都 610041;环境微生物四川省重点实验室,成都 610041
  • 王臣
  • 中国科学院成都生物研究所,成都 610041;环境微生物四川省重点实验室,成都 610041
  • 代碧莹
  • 中国科学院成都生物研究所,成都 610041;环境微生物四川省重点实验室,成都 610041;中国科学院大学,北京 100049
  • 谢翼飞
  • 中国科学院成都生物研究所,成都 610041;环境微生物四川省重点实验室,成都 610041
  • 摘要:以聚己内酯(PCL)为骨架结合不同低成本碳源制备得到PCL复合碳源,静态释放试验筛选出适用于污水深度脱氮的复合碳源,批式试验研究其脱氮性能.并通过比较碳源表面特征、反硝化功能基因丰度与微生物群落结构特征分析其脱氮机理.结果表明,PCL/玉米淀粉连续30 d释碳性能稳定,氮、磷释放量均低于1.0 mg·L-1,对水质影响较小,可用于生活污水深度脱氮.批式脱氮试验结果显示,PCL/玉米淀粉反硝化系统脱氮效果好,反硝化功能基因nirS、nirK拷贝数高,能够有效富集反硝化菌.此外,PCL/玉米淀粉系统中群落丰富度与多样性更高,系统抗逆性更强.因此,PCL/玉米淀粉能够实现生活污水长效稳定深度脱氮.
  • Abstract:Four PCL composite carbon sources were prepared with polycaprolactone (PCL) and different low-cost carbon sources. Subsequently, the composite carbon source that was suitable for tertiary nitrogen removal of municipal wastewater was selected through leaching experiments, and the denitrification performance of the composite carbon source was studied through batch tests. The results showed that in the denitrification system with PCL/corn starch, the carbon release was stable for 30 days, and the concentrations of nitrogen and phosphorus were lower than 1.0 mg·L-1, indicating that PCL/corn starch had little effect on water quality and could be used for deep denitrification of domestic sewage. Moreover, the denitrification mechanism of composite carbon source was analyzed by comprehensively comparing the surface characteristics of carbon sources, the abundance of denitrification functional genes and the composition of microbial communities. Compared with other composite carbon sources, the PCL/corn starch performed better denitrification performance, and its abundance of denitrification function genes (nirS and nirK) were higher, suggesting PCL/corn starch could effectively enrich denitrifying bacteria. Therefore, PCL/corn starch could achieve long-term, stable and tertiary nitrogen removal of municipal wastewater.

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