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聚己内酯淀粉共混物和砾石系统反硝化特性

刘 佳 沈志强 周岳溪 曹 蓉 李元志

刘 佳, 沈志强, 周岳溪, 曹 蓉, 李元志. 聚己内酯淀粉共混物和砾石系统反硝化特性[J]. 环境科学研究, 2014, 27(4): 441-446.
引用本文: 刘 佳, 沈志强, 周岳溪, 曹 蓉, 李元志. 聚己内酯淀粉共混物和砾石系统反硝化特性[J]. 环境科学研究, 2014, 27(4): 441-446.
LIU Jia, SHEN Zhi-qiang, ZHOU Yue-xi, CAO Rong, LI Yuan-zhi. Denitrification Performance of PCLStarch Blends and Gravel Supported System[J]. Research of Environmental Sciences, 2014, 27(4): 441-446.
Citation: LIU Jia, SHEN Zhi-qiang, ZHOU Yue-xi, CAO Rong, LI Yuan-zhi. Denitrification Performance of PCLStarch Blends and Gravel Supported System[J]. Research of Environmental Sciences, 2014, 27(4): 441-446.

聚己内酯淀粉共混物和砾石系统反硝化特性

基金项目: 国家科技支撑计划项目(2012BAJ21B01-02);中国博士后科学基金项目(2012M520351)

Denitrification Performance of PCLStarch Blends and Gravel Supported System

  • 摘要: 在序批试验中以PCL(聚己内酯)/淀粉共混物为碳源,研究其和砾石系统的反硝化特性,并对水中DOC(溶解性有机碳)组分进行了解析.结果表明,PCL/淀粉共混物可作为反硝化固体碳源去除低C/N水体中的NO3--N,并且不会造成NO2--N的积累. ρ(NO3--N)大于2mg/L时,试验组(PCL/淀粉共混物和砾石)和对照组(PCL/淀粉共混物)的反硝化均为零级反应. 试验组的平均反硝化速率为7.214mg/(L·h),高于对照组〔7.152mg/(L·h)〕,反硝化反应主要发生在固体碳源表面的生物膜中,砾石表面的生物膜也可利用水中的DOC实现反硝化;反硝化反应结束时,砾石表面的微生物也会分泌胞外酶参与PCL/淀粉共混物碳源的降解,导致试验组的ρ(DOC)升至74.50mg/L,高于对照组(40.75mg/L). 试验组和对照组的pH先升后降,是固体碳源降解过程产生的酸性物质与反硝化产生的碱度综合作用的结果. 试验组和对照组的DOC中均发现有还原糖、蛋白类和溶解性微生物产物.

     

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出版历程
  • 收稿日期:  2013-07-03
  • 修回日期:  2013-12-13
  • 刊出日期:  2014-04-25

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