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针对原位生物脱氮受地下水碳源缺乏制约的关键问题,制备了高分子缓释碳源材料,研究材料结构、释碳和生物脱氮性能。结果表明,缓释碳源材料静态释碳符合F ick扩散机制,释碳系数为(15.38±1.45)×10-4m g.g-1.s-1/2。动态释碳符合骨架溶蚀机制,释碳系数为(46.31±2.38)×10-4m g.g-1.h-1。缓释碳源材料具有良好的促进生物脱氮的性能,脱氮过程符合零级反应动力学,脱氮速率为(2.26±0.38)gN.m-3.d-1,反应过程碳氮比为0.81~1.21。缓释碳源材料在氮污染地下水修复方面具有良好的工程应用前景。
Aiming at the key problems of in-situ biological denitrification by the lack of groundwater carbon source, polymeric sustained release carbon source materials were prepared to study the material structure, carbon release and biological nitrogen removal. The results show that the static carbon release from sustained-release carbon source complies with Fick diffusion mechanism and the carbon release coefficient is (15.38 ± 1.45) × 10-4m g-1.s-1/2. The kinetic carbon release conforms to the skeleton dissolution mechanism and the carbon release coefficient is (46.31 ± 2.38) × 10-4m g.g-1.h-1. The slow-release carbon source material has a good performance of promoting biological nitrogen removal. The nitrogen removal process conforms to the zero-order reaction kinetics, and the rate of nitrogen removal is (2.26 ± 0.38) gN.m-3.d-1. The ratio of carbon to nitrogen 0.81 ~ 1.21. Slow-release carbon source materials have a good engineering application prospect in nitrogen-contaminated groundwater remediation.