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Porous host material for artificial wetland and preparation method of porous host material

A porous substrate and artificial wetland technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., to achieve simplified construction and construction, high strength, and good construction performance

Inactive Publication Date: 2014-04-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a porous matrix material for constructed wetlands that is easy to install and transport, has optimized performance and excellent construction performance, aiming to solve the shortcomings of existing constructed wetland fillers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Constructed wetlands are built with spherical porous matrix materials. After the anti-seepage work is done, it is only necessary to stack the spherical porous matrix materials on the anti-seepage layer. When the sewage flows through the matrix layer, a part of the sewage flows through the pores inside the porous matrix material, and a part flows through the gaps between the porous matrix materials. Constructed wetlands built with spherical porous matrix materials have a large processing capacity, and the effluent quality basically meets the discharge requirements. For example, using 10 layers of spherical porous matrix material with a particle size of 50mm as the constructed wetland matrix layer, the removal rate of BOD is 87%, and the removal rate of COD is 82%.

Embodiment 2

[0011] When constructing a constructed wetland with a rectangular brick-shaped porous matrix material, the porous matrix material is also stacked on the impermeable layer in layers without compaction. Therefore, the constructed wetland established with brick-shaped porous matrix material has a small treatment capacity, but a high degree of purification of sewage. For example, if 10 layers of brick-shaped porous matrix material with a height of 50mm are used as the matrix layer of the constructed wetland, the removal rates of BOD and COD are 98% and 92% respectively.

[0012] The above examples show that the present invention has better sewage purification ability, and can replace the traditional artificial substrate to simplify the construction of artificial wetlands.

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PUM

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Abstract

The invention discloses a porous host material for an artificial wetland and a preparation method of the porous host material, which belong to the technical field of water treatment. The method comprises the steps of: agitating 10-20% sandy clay with grain size being 0.5-1.5mm, 5-35% zeolite with grain size being 5-10mm, 5-10% rotten wood with grain size being smaller than 10mm, 5-35% grade I coal ash or grade II coal ash, 5-25% scrap iron with grain size being smaller than 5mm, 1-2% water reducer for buildings and 10-15% water by weight percentage at normal temperature uniformly to form a mixture; injecting the mixture into a spherical or brick mould, pressing at 80-120Pa / mm<2> for 1hour, demoulding, spraying water and wetting, and naturally airing and maintaining for 30-60 days to obtain the porous host material for the artificial wetland. The porous host material is higher in strength, has certain water permeability, and can replace cobblestones in the conventional artificial wetland to purify sewage.

Description

technical field [0001] The invention belongs to the technical field of water treatment materials, in particular to a preparation method of a porous matrix material for artificial wetlands. Background technique [0002] Constructed wetland is a new type of wastewater treatment process developed in the 1970s and 1980s. It treats wastewater according to the synergy of physical, chemical, and biochemical reactions in the natural wetland ecosystem, and has a strong ability to treat organic matter. Studies have shown that under the condition of low influent concentration, the removal rate of BOD by constructed wetlands can reach 85%-95%, and the removal rate of COD is greater than 80%. Constructed wetlands are generally composed of artificial substrates and aquatic plants growing on them, forming a unique ecosystem. Among them, most of the artificial substrates are pebbles. During construction, pebbles must first be classified according to the particle size, and then laid in lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F3/00
Inventor 解清杰蒋志辉何锋吴春笃
Owner JIANGSU UNIV