聚己内酯／淀粉共混物和砾石系统反硝化特性  

Denitrification Performance of PCL/Starch Blends and Gravel Supported System

作　　者：刘佳[1,2,3] 沈志强[2,3] 周岳溪[2,3] 曹蓉[1] 李元志[1,2,3] 

机构地区：[1]河北工程大学城市建设学院,河北邯郸056038 [2]中国环境科学研究院水污染控制技术研究中心,北京100012 [3]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012

出　　处：《环境科学研究》2014年第4期441-446,共6页Research of Environmental Sciences

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

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2 mg/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7.214 mg/(L·h),高于对照组〔7.152 mg/(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74.50 mg/L,高于对照组(40.75 mg/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.In batch test, the denitrification performance of polycaprolactone （PCL）/starch blends and gravel supported system was investigated using PCL/starch blends as solid carbon source, and the component of the dissolved organic carbon （DOC） in water was also analyzed. The experimental results showed that PCL/starch blends could serve as the solid carbon source for denitrification of low C/N ratio wastewater without a nitrite accumulation. When p （NOa --N ） was higher than 2 mg/L, the denitrification reaction order of the experimental group （ i. e. , PCL/starch blends and gravel） and the control group （ i. e. , PCL/starch blends） were zero order reaction. The average denitrification rate for the experimental group was 7. 214 mg/（ L＂ h）, which was higher than 7. 152 mg/（ L＂ h） of the control group. This indicated that most of the nitrate was reduced in the biofilm attached on the surface of PCL/starch blends. In addition, biofilm attached on the surface of the gravel was also used the DOC in the water for denitrification. At the end of denitrification reaction, microorganisms on the surface of the gravel were also involved in the degradation of carbon source of PCL/starch blends, resulting p（DOC） of experimental group was 74.50 mg/L higher than the control group of 40. 75 mg/L. The pH of experimental and control groups decreased after increased first due to the comprehensive function of acidic substances and alkalinity produced in the process of degradation of solid carbon source and denitrification, respectively. The reducing sugar, protein and SMP-like substances were found in the DOCs of both experimental and control groups.

关 键 词：PCL 淀粉共混物 硝酸盐 反硝化 固体碳源 溶解性有机碳 

分 类 号：X703.1[环境科学与工程—环境工程]