Fan Zhen-xing, Wang Jian-long
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue. 2009 Aug 15;30(8):2315-9.
Polylactic acid (PLA) was used as solid carbon source and biofilm support simultaneously, to investigate the applicability of PLA in the denitrification process. The effect of temperature on denitrification performance was also studied. The IR analysis and SEM observation were performed to investigate the PLA surface structure and biofim morphology. The results showed that when the initial concentration of nitrate nitrogen was 50 mg/L and the temperature was 30 degrees C, the average denitrification rate was 2.6 x 10(-1) mg/(g x h) and nitrate could be completely removed within 13h. Temperature had a significant influence on the denitrification rate. The IR analysis and SEM observation of PLA surface structure confirmed the feasibility of PLA as solid carbon source. The SEM observation of biofim showed that the biofilm was thin and mainly consisted of cocci.
聚乳酸（PLA）同时用作固体碳源和生物膜载体，以研究PLA在反硝化过程中的适用性。还研究了温度对反硝化性能的影响。进行了红外分析和扫描电子显微镜观察，以研究PLA的表面结构和生物膜形态。结果表明，当硝酸盐氮初始浓度为50mg/L且温度为30℃时，平均反硝化速率为2.6×10⁻¹mg/(g·h)，硝酸盐可在13小时内完全去除。温度对反硝化速率有显著影响。PLA表面结构的红外分析和扫描电子显微镜观察证实了PLA作为固体碳源的可行性。生物膜的扫描电子显微镜观察表明，生物膜很薄，主要由球菌组成。
