Filling material used for removing permeable reactive barrier of nitrate and preparation method thereof
A technology for permeable reaction walls and filling materials, which is applied in the field of filling materials for permeable reaction walls and its preparation, can solve problems such as difficult co-precipitation or adsorption, complicated operation of electroosmosis, and difficulty in removing nitrate, etc., achieving simple technology , Restoring a good ecological environment and good economic benefits
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[0022] The filling material for the permeable reaction wall (ie PRB material) for removing nitrate of the present invention is composed of pretreated iron powder, non-metal carrier activated carbon (C) and coarse sand as the basic medium. The pretreated iron powder and activated carbon The volume ratio of sand and coarse sand is 3:1:6. The selection of PRB materials: the pretreated iron powder particle size is 0.45-0.5mm, the activated carbon particle size is 1.7-2mm, and the coarse sand particle size is 0.25-2mm; The composition content of the iron powder is: Fe is 96.5%, C is 0.05%, S is 0.06%, and the rest are impurities. In the whole reaction process, Fe 0 Poor activity, Fe 2+ Has strong reducibility, with Fe 0 As a reaction material, the removal effect of nitrate is low, Fe 2+ The removal effect of nitrate is obvious, so Fe 0 Requires pretreatment to produce Fe 2+ , Fe 2+ It has the characteristics of strong reducibility, fast reaction speed and high nitrate removal rate.
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