Filling medium for permeable reactive wall and preparation method of filling medium

Abstract

The invention belongs to the technical field of permeable reactive walls, and discloses a filling medium for a permeable reactive wall and a preparation method of the filling medium; a mounting rack is mounted, a U-shaped support is fixed in the mounting rack, a filter layer is arranged between the U-shaped support and the mounting rack, and the U-shaped support is internally filled with a medium;the filling medium is prepared, a solid-phase carbon source, a biofilm carrier, activated carbon particles and zeolite are uniformly stirred according to a certain mass ratio, and sieving is carriedout; after stirring and sieving are completed, ferric hydroxide and aluminosilicate are added into the mixture obtained in the step 2 to obtain the filling medium; and the prepared filling medium is added into the U-shaped support according to a corresponding stage, and oxidizing is carried out. A uniform mixture of polyhydroxyalkanoate and ceramsite is used as the filling medium of the permeablebiological reaction wall, the raw materials are easy to obtain, the process is simple, only the polyhydroxyalkanoate and the ceramsite need to be simply and uniformly mixed (the mixture can contain the solid-phase carbon source, the biological membrane carrier, the activated carbon particles and zeolite), and the requirements for operation and management are low.

Description

technical field [0001] The invention belongs to the field of permeable reaction walls and technologies, in particular to a filling medium for a permeable reaction wall and a preparation method thereof. Background technique [0002] At present, groundwater nitrate pollution is becoming more and more serious. Drinking nitrate-contaminated groundwater can lead to increased chances of infants suffering from methemoglobinemia and adults suffering from cancer. At present, the methods of removing nitrate in groundwater at home and abroad mainly include physical method, chemical reduction method and biological denitrification method. [0003] The use of physical methods to remove nitrate is usually ex-situ treatment, which has a series of defects such as time-consuming, high cost, and difficult operation. In fact, it is not completely removed, but only the transfer or concentration of nitrate pollutants occurs. [0004] Chemical denitrification methods are generally divided into tw...

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Problems solved by technology

[0006] (1) The physical method has a series of defects such as time-consuming, high cost, and difficult operation

[0007]

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