Degradation of phenol and aniline in groundwater by KMnO4 slow-release oxidant
In order to achieve the purpose of controlled release,effective transport and efficient remediation of the oxidant,the slow-release technology is used to realize the long-term and efficient remediation of the groundwater aquifer by the oxidant.The potassium permanganate(KMnO4)slow-release materials with the addition of activated carbon were experimentally prepared by melt molding method,and the optimal ratios and sizes of slow-release materials were determined by release kinetics.In addition,the phenol-aniline degradation kinetics by KMnO4 slow-release materials and the effect of groundwater quality on phenol-aniline degradation were also investigated.Finally,an experiment was conducted on the degradation of phenol and aniline using slow-release materials in a two-dimensional sand tank.The results showed that the slow-release effect of KMnO4 slow-release material with a mass ratio of 3∶3∶2∶1 for paraffin,potassium permanganate,activated carbon,and silica sand,which was a 1 cm cube,was the best.The release kinetics study showed that the release rate of the sustained-release material after 30 d was 64.17％,indicating that it had excellent sustained-release properties,and the first-order kinetics equation was used to fit the experimental data with good correlation.And there were numerous holes and gaps appeared on the surface of KMnO4 retarded material after retardation,and the content of Mn,O,Si,and K elements on the surface increased significantly.This indicating that the release principle of KMnO4 slow-release material in water was mainly dissolution diffusion.Under the action of the slow-release oxidant,the concentration changes of phenol and aniline in the two-dimensional sand tank form a conical repair area centered on the slow-release material,and the concentration of phenol and aniline in the longitudinal direction decreased rapidly.This experimental result provides theoretical support for the remediation of actual groundwater aquifer pollution.
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