Matrix filler with stable nitrogen and phosphorus removal effects, matrix and constructed wetland

A technology for nitrogen and phosphorus removal and constructed wetlands, which is applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve problems such as easy clogging and unstable nitrogen and phosphorus removal effects, and achieve non-pollution Globalization, good market application prospects, and outstanding effects on environmental protection

Pending Publication Date: 2021-08-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of unstable nitrogen and phosphorus removal effect and easy clogging of artificial wetland matrix fillers in the prior art, the present invention provides a matrix filler and matrix with stable denitrification and phosphorus removal effects using biomass fuel combustion ash, and build artificial wetlands

Method used

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  • Matrix filler with stable nitrogen and phosphorus removal effects, matrix and constructed wetland
  • Matrix filler with stable nitrogen and phosphorus removal effects, matrix and constructed wetland
  • Matrix filler with stable nitrogen and phosphorus removal effects, matrix and constructed wetland

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In this embodiment, the following method is used to pretreat the fuel ash of a biological power plant to obtain a matrix filler, and the obtained matrix filler is as follows: figure 1 Shown:

[0027] (1) Collect the ash produced in the combustion process of the biomass power plant, and sieve the ash to remove the powder with a particle size less than 1cm and the massive large particles with a particle size greater than 4cm;

[0028] (2) Use clear water to rinse the dust on the surface of the ash after the screening in the previous step, and soak in flowing clear water to remove impurities in the pores of the ash;

[0029] (3) After draining the ash, dry it at a temperature of 60°C;

[0030] (4) Sieve the dried ash and slag to obtain small particle fillers with a particle size of 1-2 cm and large particle fillers with a particle size of 3-4 cm.

[0031] Wherein, the matrix filler in the present embodiment is observed by a scanning electron microscope (SEM), and the sca...

Embodiment 2

[0044] On the basis of Example 1, this example further verifies the denitrification and phosphorus removal effects of the matrix filler provided in Example 1 by building an experimental pool of a small-scale constructed wetland device.

[0045] In this embodiment, among the artificial wetland composite fillers used, the bottom layer is a gravel layer with a particle size of 8-10 cm and a thickness of 100-120 mm; the lower layer is ash with a large particle size of about 3-4 cm and a thickness of 120- 150mm; the upper layer is small particle size ash, about 1-2cm, and the thickness is 150-180mm. And plant plantain and reeds on the top layer with a density of 10-12 plants / m 2 .

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Abstract

The invention belongs to the field of environmental protection engineering, and particularly relates to a matrix filler with stable nitrogen and phosphorus removal effects, a matrix and a constructed wetland. The matrix filler is a screened substance of ash obtained after biomass fuel in a biomass power plant is combusted; the particle size range of the selected ash is 1-4 cm; in percentage by mass, the content of SiO2 in the selected matrix filler is not less than 50%; and the ash contains one or more of Mg, Ca, Al and Fe, and the sum of the mass percentages of the four elements is not less than 20% in terms of oxides. The matrix is of a multi-layer structure and sequentially comprises a gravel layer, a large-particle filler layer and a small-particle filler layer from bottom to top. The large-particle filler layer and the small-particle filler layer are respectively particles with different particle sizes screened from the ash residues. The matrix filler can overcome the defects that in the prior art, a matrix filler of a constructed wetland is unstable in nitrogen and phosphorus removal effects, prone to blockage and the like.

Description

technical field [0001] The invention belongs to the field of environmental protection engineering, and in particular relates to a matrix filler, a matrix and an artificial wetland with stable denitrification and phosphorus removal effects. Background technique [0002] Constructed wetland is an engineered ecosystem that is artificially built, managed and controlled. Its functional part is composed of water, filter materials and aquatic organisms. It has the characteristics of higher productivity and better removal of pollutants than natural wetlands. At the same time, because of its low infrastructure investment cost, miniaturization and decentralized construction, low energy consumption and operating costs, easy operation and operation, as well as the ability to purify sewage and beautiful landscapes, it is regarded as my country's treatment of rural sewage and small towns. Best process for sewage. [0003] Fillers in constructed wetlands, also known as substrates, not only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F101/16
CPCC02F3/322C02F2101/16C02F2203/006
Inventor 崔康平田雪滢崔敏姝陈奕涵何钰莹于凡轩
Owner HEFEI UNIV OF TECH
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