State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China.
Bioresour Technol. 2015 Jan;175:239-44. doi: 10.1016/j.biortech.2014.10.006. Epub 2014 Oct 24.
Cornstarch/polycaprolactone (SPCL) blends were prepared and used as external carbon source for biological denitrification in a constructed wetland. The denitrification performances, components of dissolved organic matter (DOM) and microbial diversity were investigated. The results showed that nitrate was removed mainly in the layer filled with SPCL, and the average denitrification rate was 0.069kg/m(3)d (nitrate removal efficiency was 98.23%). The major component of DOM was polysaccharides which mainly consisted of reducing sugar. Besides, the concentrations of polysaccharides and reducing sugar decreased along the height of the constructed wetland. Therefore, the dissolved organic carbon (DOC) of effluent decreased to 6.54mg/L. Denitrifying bacteria Bacillus (24.25%) and Thauera (9.36%) were the most abundant genera in the biofilm attached on the surface of SPCL.
玉米淀粉/聚己内酯（SPCL）共混物被制备并用作人工湿地中生物反硝化的外部碳源。研究了反硝化性能、溶解有机物（DOM）成分和微生物多样性。结果表明，硝酸盐主要在填充 SPCL 的层中被去除，平均反硝化速率为 0.069kg/m(3)d（硝酸盐去除效率为 98.23%）。DOM 的主要成分是多糖，主要由还原糖组成。此外，多糖和还原糖的浓度沿人工湿地的高度降低。因此，流出物的溶解有机碳（DOC）降低到 6.54mg/L。生物膜附着在 SPCL 表面上的优势属为芽孢杆菌（24.25%）和陶厄氏菌（9.36%）。
