Filler special for artificial wetland and preparation method thereof

A technology of artificial wetlands and raw materials, applied in the direction of chemical instruments and methods, applications, household appliances, etc., can solve the problems such as the decrease of phosphorus adsorption rate, and achieve the effect of large porosity, long service life and high strength

Inactive Publication Date: 2010-10-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The constructed wetland system has a good effect on the treatment of low concentrations of phosphorus, but the phosphorus efficiency is only about 4

Method used

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  • Filler special for artificial wetland and preparation method thereof
  • Filler special for artificial wetland and preparation method thereof
  • Filler special for artificial wetland and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw material is the fly ash of Nanjing Thermal Power Plant. Mix 10g of fly ash and 80g of 32.5 portland cement with about 45g of water, add 0.015g of aluminum powder, stir evenly, put it into the mold and put In the constant temperature box, let it stand for 20 minutes to foam, and then cure it at room temperature for half a day, and you can get a lightweight, porous hollow ball artificial wetland filler with a radius of 2.5cm. Its structural diagram is as figure 1 , figure 2 , image 3 shown.

[0027] Phosphorus removal test of domestic sewage was carried out using the phosphorus adsorption material made by the above process. The phosphorus content in raw domestic sewage water is 5.1mg / l. Put 10g of the special filler for constructed wetland into a 300ml Erlenmeyer flask of domestic sewage, and the hydraulic retention time is 2 hours. After treatment, the concentration of phosphorus in the effluent is 0.6mg / l, and the removal rate of phosphorus is 88.2%.

Embodiment 2

[0029] The raw material is the fly ash of Nanjing Thermal Power Plant. Mix 15g of fly ash and 90g of 42.5 Portland cement with about 40g of water, add 0.010g of aluminum powder, stir evenly, add it to the mold, and put it into the mold at 40°C In a constant temperature box, let it stand for 30 minutes to foam, and then cure it at room temperature for 1 day, and you can get a lightweight, porous hollow ball artificial wetland filler with a radius of 3cm.

[0030] The phosphorus adsorption material made by the above process was used to carry out the phosphorus removal test of higher concentration sewage. The phosphorus content of raw sewage water is 10mg / l. Put 10g of the special filler for constructed wetland into a 300ml Erlenmeyer flask of domestic sewage, and the hydraulic retention time is 2 hours. After treatment, the concentration of phosphorus in the effluent was 1.44mg / l, and the removal rate of phosphorus was 85.6%.

Embodiment 3

[0032] The raw material is the fly ash of Nanjing Thermal Power Plant. Mix 20g of fly ash and 100g of 52.5 Portland cement with about 50g of water, add 0.015g of aluminum powder, stir evenly, add 0.001g of aluminum powder Mix the waste engine oil and evenly coat the mold on the surface of the mold; put it in a constant temperature box at 50°C, let it stand for foaming for 25 minutes, and you can get a hollow cube with a length of 6cm, and maintain it at room temperature for 1 day to obtain a lightweight Constructed wetland special filler.

[0033] The phosphorus adsorption material made by the above process was used to carry out the phosphorus removal test of higher concentration sewage. The phosphorus content of raw sewage water is 30mg / l. Put 10g of the special filler for constructed wetland into a 300ml Erlenmeyer flask of domestic sewage, and the hydraulic retention time is 2 hours. After treatment, the concentration of phosphorus in the effluent was 4.6mg / l, and the rem...

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Abstract

The invention aims to improve the phosphorus removal rate of an artificial wetland and provides a filler special for the artificial wetland and a preparation method thereof. The preparation method comprises the following steps of: after mixing cement and fly ash by using water, adding an aluminum powder foaming agent, and uniformly stirring and mixing, wherein the mass ratio of the cement to the fly ash to the aluminum powder to the water is 50-100:10-30:0.1-0.5:25-50; and pouring the stirred slurry into a mold for molding, foaming at the temperature of between 20 and 50 DEG C for 20 to 60 minutes, and curing to prepare the filler special for the artificial wetland. The method has the characteristics of simple production method, low cost, and the like. The filler has the advantages of high phosphorus adsorption efficiency, high intensity, light mass, large specific surface area, and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a special filler for artificial wetlands and a preparation method thereof. Water, cement, and fly ash are used as raw materials, and aluminum powder is used as a foaming material to prepare a special filler for removing phosphorus in water. Background technique [0002] Water eutrophication pollution has become a major problem in my country's environmental pollution. At present, the methods of phosphorus removal at home and abroad mainly include biological methods and physical and chemical methods. For example, the chemical coagulation precipitation method has high efficiency in phosphorus treatment and is easy to operate, but it produces a large amount of difficult-to-treat sludge and the high salt concentration in the effluent limits its popularization and application; while the biological phosphorus removal process requires high requirements in operation and management....

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B38/00C02F3/32C02F3/34
CPCY02W10/10
Inventor 路宏伟尤朝阳刘汤勋万玉龙
Owner NANJING UNIV OF TECH
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