Ecological matrix for improving denitrification of underground infiltration system, and preparation method thereof

Abstract

The invention relates to an ecological matrix and a preparation method thereof, and concretely discloses an ecological matrix for improving denitrification of an underground infiltration system, and apreparation method thereof. The ecological matrix comprises a surface soil layer, a water distribution layer, an infiltration layer and a water collection layer, wherein the surface soil layer is composed of in-situ soil; the water distribution layer is prepared by uniformly mixing in-situ soil, coal cinder, wood charcoal and activated sludge; the infiltration layer is prepared by uniformly mixing in-situ soil, coal cinder, wood charcoal and sands; and the water collection layer is completely composed of gravels. The water collection layer, the infiltration layer, the water distribution layerand the surface soil layer of the subsurface infiltration bed body are respectively filled with the ecological matrix from bottom to top, and the permeability of the whole bed body matrix layer is analyzed; and the denitrification effect of the system is analyzed by monitoring the quality of inlet and outlet water. By adding the wood charcoal, the permeability of the matrix layer of the infiltration system can be improved, the hydraulic load of the system is improved, the ammonia nitrogen adsorption effect of the matrix is enhanced, meanwhile, a huge attachment carrier can be provided for microorganisms, and the biological denitrification capacity is enhanced.

Description

Technical field [0001] The invention relates to an ecological substrate and a preparation method thereof, in particular to an ecological substrate added with biochar to improve the denitrification of an underground infiltration system and a preparation method thereof. Background technique [0002] The underground infiltration system is an artificially enhanced disperse sewage land treatment technology. This technology can realize on-site collection, treatment and reuse of sewage, and has the advantages of low investment and operating costs, no impact on the ground landscape, simple management and maintenance, and good water quality. The subsurface infiltration matrix layer is usually divided into topsoil layer, water distribution layer, infiltration layer and water harvesting layer from the surface down. The topsoil layer is usually used for ground greening or planting crops; the water distribution layer includes impervious dishes and water pipes. The study believes that the ch...

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Problems solved by technology

[0003] The underground infiltration system has a long hydraulic retention time and good pollutant removal effect, but the hydraulic load is low and the floor area is large; in order to reduce the floor area, it is necessary to improve the matrix permeability and increase the hydraulic load during system operation, but the matrix pore space is limited Due to the large amount of water distribution, the pores of the matrix will be saturated, and the structure or state of the matrix will change locally, which will easily cause the matrix of the system to be blocked, thereby affecting the removal effect of pollutants, especially total nitrogen.

This is the limitation of the system technology itself