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

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

Inactive Publication Date: 2013-03-06
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] To build a constructed wetland 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 layer by layer. When the sewage flows through the matrix layer, part of the sewage flows through the small holes inside the porous matrix material, and part of it flows through the gaps between the porous matrix materials. The artificial wetland built with spherical porous matrix materials has a large treatment capacity, and the quality of the effluent basically meets the discharge requirements. For example, if 10 layers of spherical porous matrix materials with a particle size of 50 mm are used as the matrix layer of the constructed wetland, the removal rate of BOD is 87%, and the removal rate of COD is 82%.

Embodiment 2

[0011] When constructing artificial wetlands with rectangular brick-shaped porous matrix materials, the porous matrix materials are also stacked on the anti-seepage layer layer by layer without compaction, but there is no gap between the brick-shaped porous matrix materials, and all the sewage comes from the inside of the porous matrix materials. Therefore, the artificial wetland built with brick-shaped porous matrix materials has a small treatment capacity, but a high degree of purification of sewage. For example, if 10 layers of brick-shaped porous matrix materials with a height of 50mm are used as the matrix layer of the constructed wetland, the removal rates of BOD and COD can reach 98% and 92% respectively.

[0012] The above examples illustrate that the present invention has better sewage purification ability, and can replace traditional artificial substrates 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, it relates to a preparation method of a porous matrix material for artificial wetlands. Background technique [0002] Constructed wetland is a new wastewater treatment process developed in the 1970s and 1980s. It treats wastewater based on 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 when the influent concentration is low, the removal rate of BOD in 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, the pebbles must first be classified according to the particle size, and then laid in layers. Ge...

Claims

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Application Information

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