DOUBLE-LAYER PERSULFATE SUSTAINED-RELEASE MATERIAL AND ITS PREPARATION METHOD

摘要

The present invention involves a persulfate-release material used in the filler of permeable reactive barrier (PRB). This material presents double-layered structure characteristic: inner- and outer-layers are consisted of persulfate, cement, sand and water with different mass ratio. Two different types of moulds are used for the regulation of the shape-of the two-layer structures, which guarantees the stability and reproducibility of its structures and properties. During the whole released process, the released rate become more uniform and stable by the use of this material. During the whole service period, the change of the released rate is very slow, and the service lifetime can be 1-10 years. This invention can both reduce the initial released rate and improve the later released rate, and thus the whole released rate can be more uniform, which can be an important method to promote the efficiency of the persulfate toward engineering application.

主权项

1. A double-layer persulfate sustained-release material, wherein, the described material includes internal and external structures, and the thickness ratio between inner- and outer-layers is in the range of (1-4): 1; the permeability of the internal material is higher than that of the external one, and the permeability coefficient of inner-layer material is 5-200 times as high as that of the outer-layer material.