【摘要】 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Fick扩散机制,静态释碳系数为(15.38±1.45)×10-4mg.g-1.s-1/2。动态释碳符合骨架溶蚀机制,动态释碳系数为(46.31±2.38)×10-4mg.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)g.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。更多还原

【Abstract】 In situ denitrification is a good method for reducing nitrate contamination,but is restricted by the lack of carbon in the groundwater.A slow-release organic carbon source was developed to supply the carbon.Simulations demonstrated that the material improves the denitrification.In a static system,the carbon release follows a Fickian law with release coefficients of(15.38±1.45)×10-4 mg·g-1·s-1/2,while in a dynamic system,carbon release follows Case II model with a release coefficients of(46.31±2.38)×10-4 mg·g-1·h-1.Simulations for domestic,in situ groundwater conditions show that the material improves the denitrification with average carbon-nitrogen ratios of 0.81-1.21.The denitrification is a zero order kinetics process with the denitrification dynamics rate equal to(2.26±0.38) g·m-3·d-1.Thus,the slow-release organic carbon-source is a suitable carbon source for in situ groundwater denitrification.更多还原