Release and simulation study of persulfate controlled release materials based on groundwater remediation
To study the release process of persulfate controlled release materials(CRMs)based on groundwater remediation,this paper prepared CRMs containing quartz sand components,using persulfate as oxidant and paraffin as binder,and conducted release experiments under different conditions.At the same time,a new two-phase diffusion model was proposed based on first-order kinetics and Fick's diffusion law to simulate the release process of CRMs.The release experiments were designed to release CRMs with different wax sand ratios and different persulfate contents,obtaining release data for more than 15 days.Simulation calculations were investigated using first-order kinetics,diffusion models,and the two-phase diffusion model proposed in this paper.The results show that the determination coefficients R2 of the two-phase diffusion model are all above 0.96,and the accuracy is improved by more than 10%compared to a single first-order kinetic model and diffusion model,which can more accurately simulate the release process of CRMs in this paper.As the proportion of paraffin and the content of sodium persulfate gradually increase,the rapid release constant(k)and effective diffusion coefficient(De)in the model also increase linearly.The calculation of the two-phase diffusion model can more accurately calculate the release process of CRMs,providing data support for the preparation and practical in-situ application of CRMs.
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