Constructed wetland matrix filling material for simultaneous nitrogen and phosphorus removal and its preparation method

A technology for simultaneous denitrification and dephosphorization and artificial wetlands, which is applied in the field of phosphorus matrix filler and its preparation, and simultaneously removes nitrogen, which can solve the problems of poor treatment effect, poor compressive strength and short service life, and achieve excellent purification. effect, improved service life, simplified selection effect

Inactive Publication Date: 2012-10-24
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a constructed wetland substrate filler for synchronous denitrification and dephosphorization and a preparation method thereof. It is necessary to solve the technical problem that the fly ash substrate has a poor treatmen...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, the preparation method of the constructed wetland matrix filler for synchronous denitrification and dephosphorization, the preparation steps are as follows:

[0032] Step 1. Prepare modified fly ash. Mix fly ash with 2 mol / L sodium hydroxide solution at a weight ratio of 1:10, heat and stir in a closed container at 100°C for 24 hours, and centrifuge After separation, the obtained solid material was repeatedly washed until the pH was 7, dried in an oven and then prepared into powder;

[0033] Step 2, mixing modified fly ash, fly ash and cement in a ratio of 50:20:30 by weight, then adding water with 30% of the total weight of modified fly ash, fly ash and cement, and mixing evenly;

[0034] Step 3. Put the mixture obtained in Step 2 into a mold with a size of 70×70×70 mm, cure it for more than 8 days, and make the artificial wetland matrix filler after air-drying.

[0035] The packing prepared in the above-mentioned Example 1 has been tested to have a comp...

Embodiment 2

[0037] Embodiment 2, the preparation method of the constructed wetland matrix filler for synchronous denitrification and dephosphorization, the preparation steps are as follows:

[0038] Step 1. Prepare modified fly ash. After mixing fly ash and sodium hydroxide solution with a concentration of 4mol / L in a weight ratio of 1:8, heat and stir in a closed container at 100°C for 36 hours, and then centrifuge Finally, the obtained solid material was repeatedly washed until the pH was 7, and dried in an oven to prepare powder;

[0039] Step 2, mixing modified fly ash, fly ash and cement in a ratio of 40:40:20 by weight, then adding water with 70% of the total weight of modified fly ash, fly ash and cement, and mixing evenly;

[0040] Step 3: Put the mixture obtained in Step 2 into a mold with a size of 10×20×20 mm, cure it for more than 6 days, and make the artificial wetland matrix filler after air-drying.

[0041] The density of the filler prepared in the above-mentioned embodime...

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Abstract

The invention provides a constructed wetland matrix filling material for simultaneous nitrogen and phosphorus removal and its preparation method. The raw materials of the filling material comprise modified fly ash, fly ash, cement and water. The modified fly ash, the fly ash and the cement are in a weight ratio of 20-60:20-60:20-30, and the water content accounts for 30%-100% of the total weight of the modified fly ash, the fly ash and the cement. The modified fly ash is prepared by: mixing fly ash and a sodium hydroxide solution with a concentration of 2-5mol/L in a weight ratio of 1:6-10, then heating and stirring the mixture in a closed container at a temperature of 100DEG C for 24-48 hours, carrying out centrifugal separation, then washing the obtained solid material repeatedly till pH of 7, drying the solid material in an oven and making it into powder. The constructed wetland filling material provided in the invention has excellent purification effects on nitrogen and phosphorusat the same time, can be used for treatment of eutrophic water bodies and treatment of agricultural non-point source polluted water bodies, and can meet the demands for further removal of nitrogen and phosphorus from secondary effluent of a sewage treatment plant.

Description

technical field [0001] The invention relates to a matrix filler for artificial wetland sewage treatment, in particular to a matrix filler capable of simultaneously removing nitrogen and phosphorus and a preparation method thereof. Background technique [0002] Constructed wetland is a sewage treatment technology with low investment and low operating cost, and has been widely used in sewage treatment in recent years. Matrix filler is an important part of constructed wetland, and choosing matrix filler with strong adsorption effect on pollutants can greatly improve the sewage treatment effect of constructed wetland. When constructing constructed wetlands, choosing cheap industrial wastes as wetland fillers can reduce the cost of constructed wetlands and provide an effective way for industrial wastes to be reused. [0003] With the rapid development of energy and power industry, the discharge of fly ash has increased sharply, and the stacking of fly ash occupies a large amount...

Claims

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Application Information

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IPC IPC(8): C04B38/08C04B28/04C04B18/08B01J20/00C02F3/32
CPCY02W30/91
Inventor 吴文伶宋中南张涛王珂戢文占
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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