Artificial wetland phosphorous removal porous composite substrate filler and preparation method thereof

A technology of constructed wetlands and composite substrates, applied in chemical instruments and methods, water treatment of special compounds, water pollutants, etc., can solve problems such as pH increase and blockage, achieve increased porosity, good environmental benefits, and improved removal efficiency effect

Inactive Publication Date: 2018-03-16
河南永泽环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steel slag has good phosphorus removal performance. After adding calcium-containing substances such as limestone, calcium can form insoluble calcium phosphate with phosphorus to further improve phosphorus removal rate. However, it is found that steel slag matrix will cause problems such as clogging and pH increase.

Method used

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  • Artificial wetland phosphorous removal porous composite substrate filler and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A porous composite matrix filler for phosphorus removal in artificial wetlands is prepared by adding water to the following raw materials in weight percentages: 40% steel slag, 25% calcium carbonate powder, 25% crop straw and leaves, and 10% binder. The particle size of the steel slag is not greater than 1mm. The particle size of the calcium carbonate powder is 5-10 μm. The straws are corn and soybean plant straws, the leaves are street fallen leaves, and the straw:leaves weight ratio is 3:2. The binder is Na 2 SiO 3 A mixture of polyacrylamide and polyacrylamide, the weight ratio of the two is 5:1.

[0025] Its preparation method comprises the following steps:

[0026] 1) Naturally air-dry the stalks and leaves, then pulverize them, pass through a 1mm sieve, and take the sieved matter to obtain the stalks and leaves powder;

[0027] 2) Stir and mix steel slag, calcium carbonate powder, straw and leaf powder, add binder and water and continue to stir and mix to obt...

Embodiment 2

[0030] A porous composite matrix filler for phosphorus removal in artificial wetlands is prepared by adding water to the following raw materials in weight percentage: 45% steel slag, 15% calcium carbonate powder, 20% crop straw and leaves, and 20% binder. The particle size of the steel slag is not greater than 1mm. The particle size of the calcium carbonate powder is 5-10 μm. The straw is wheat plant straw, the leaves are forest farm leaves, and the straw:leaves weight ratio is 1:1. The binder is Na 2 SiO 3 A mixture of polyacrylamide and polyacrylamide, the weight ratio of the two is 7:1.

[0031] Its preparation method comprises the following steps:

[0032] 1) Naturally air-dry the stalks and leaves, then pulverize them, pass through a 1mm sieve, and take the sieved matter to obtain the stalks and leaves powder;

[0033] 2) Stir and mix steel slag, calcium carbonate powder, straw and leaf powder, add binder and water and continue to stir and mix to obtain a mixed slurr...

Embodiment 3

[0036] A porous composite matrix filler for phosphorus removal in artificial wetlands is prepared by adding water to the following raw materials in weight percentages: 50% steel slag, 20% calcium carbonate powder, 10% crop straw and leaves, and 20% binder. The particle size of the steel slag is not greater than 1mm. The particle size of the calcium carbonate powder is 5-10 μm. The straw is rice plant straw, the leaves are fallen leaves from the street, and the weight ratio of straw:leaves is 2:1. The binder is Na 2 SiO 3 A mixture of polyacrylamide and polyacrylamide, the weight ratio of the two is 9:1.

[0037] Its preparation method comprises the following steps:

[0038] 1) Naturally air-dry the stalks and leaves, then pulverize them, pass through a 1mm sieve, and take the sieved matter to obtain the stalks and leaves powder;

[0039] 2) Stir and mix steel slag, calcium carbonate powder, straw and leaf powder, add binder and water and continue to stir and mix to obtain...

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Abstract

The invention discloses an artificial wetland phosphorous removal porous composite substrate filler which is prepared from, in weight percent, 40-50% of steel slag, 15-25% of calcium carbonate powder,10-25% of crop straws and tree leaves and 10-20% of binding agents. According to the filler, total phosphorus treating efficiency of an artificial wetland composite substrate is improved, waste resources are cycled, production cost is reduced, phosphorous is removed by the aid of calcium carbonate and the steel slag, substrate holes are enlarged by the aid of straw and tree leaf powder, substrateblocking is reduced, alkalinity caused by the steel slag is neutralized, pH (potential of hydrogen) of outlet water is buffered, organic nutrition is provided for microorganisms by the straws and tree leaves, wetland purification efficiency is improved, and phosphorous removal is finally optimized.

Description

technical field [0001] The invention belongs to the field of artificial wetland materials, and in particular relates to a porous composite matrix filler for phosphorus removal in artificial wetlands and a preparation method thereof. Background technique [0002] Phosphorus removal in constructed wetlands is accomplished through the combined action of the physical and chemical reactions of the wetland filler matrix, the absorption of plant roots, and the accumulation of microorganisms. However, the absorption of plants and the accumulation of microorganisms only account for a small part of phosphorus removal. The study found that the main removal mechanism of phosphorus is the adsorption of the matrix. Orthophosphate in the water body is adsorbed by the medium when the water flows through the surface of the wetland medium. The quality of this adsorption capacity will depend on whether the wetland has good hydraulic conductivity. and high specific surface area. In addition, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/34C02F101/10
CPCC02F3/32C02F3/34C02F2101/105C02F2305/06
Inventor 张明慧周明赵亚鹏
Owner 河南永泽环境科技有限公司
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