碎石陶粒基质反硝化影响因素及其交互作用研究

Influencing Factors and Their Interaction Study of the Gravel and Ceramic Denitrification

对已运行2年的湿地中的碎石和陶粒基质,通过3因素正交试验设计,设定不同的温度、总氮浓度和碳氮比(COD/TN),在实验室测定反硝化强度,探究所设定3因素影响基质反硝化作用的显著性及因素间的交互作用,确定各因素各水平的优水平组合;比较相同条件下不同基质反硝化强度大小。结果显示,碎石反硝化中,仅温度对其影响高度显著,其它因素的影响均不显著,也不存在因素间的交互作用,碎石反硝化的各因素优水平组合为温度35℃、总氮浓度20 mg/L、碳氮比5:1;陶粒反硝化试验中,温度和碳氮比分别表现出高度显著性,且温度和碳氮比之间存在显著交互作用。陶粒反硝化的优水平组合为温度35℃、总氮浓度5 mg/L、碳氮比7:1。在相同条件下,陶粒反硝化强度远强于碎石。

Orthogonal experiment was designed for gravels and ceramsites collected from a wetland which has been running for 2 years, through setting 3 levels of temperatures, total nitrogen concentration and carbonitride ratio（COD/TN）, to determine matrix denitrification capability and the optimization combination between the levels of various factors. Results showed that,for gravels, only temperature presented statistical significant, and there was no interaction between factors. The optimal condition for the denitrification of gravel were temperature 35 ℃, total nitrogen concentration 20 mg/L and the carbonitride ratio 5：1. While for the ceramsite denitrification, temperature and carbonitride ratio affected significant, and the interaction was significant between the temperature and the carbonitride ratio. The optimal condition of the denitrification for ceramsite were temperature 35 ℃, total nitrogen concentration 5 mg/L, and the carbonitride ratio 7：1. The ceramsite denitrification intensity was much better than the gravel under the same conditions.