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Phosphorus release inhibitor for eutrophic water deposit and its prepn and application

A technology of eutrophication and inhibitors, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of not being widely used, secondary pollution, etc., and achieve low cost, good effect

Inactive Publication Date: 2006-08-02
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the placement of the sediment cleared by dredging also needs to be treated with caution. The heavy metals, pesticides and other dangerous substances contained in the sediment may cause secondary pollution due to improper placement.
However, the first two methods are mainly limited by the cost of covering materials, passivating agents and biological toxicity, and have not been widely used.

Method used

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  • Phosphorus release inhibitor for eutrophic water deposit and its prepn and application
  • Phosphorus release inhibitor for eutrophic water deposit and its prepn and application

Examples

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Effect test

Embodiment 1

[0024] Phosphorus release inhibitors were prepared from the fly ash of Tianjin Taida Development Zone power plant. And apply this inhibitor to the surface of TEDA artificial landscape channel sediments, and observe its effect of inhibiting phosphorus release. The specific implementation steps are as follows:

[0025] Weigh 40g of fly ash from Taida Power Plant, dry it properly, and keep its moisture content at about 5%; add 100ml of alum buffer solution containing 0.7g / L of Al to soak for 24 hours, and keep stirring during this period to make it fully mixed. Put the mixture into a high-temperature furnace and raise the temperature to 150°C, gradually evaporate the water in it, cool and dry to obtain the phosphorus release inhibitor.

[0026] In the experiment, the self-made column experimental device was used to carry out the continuous dynamic release experiment of phosphorus, and the experimental verification was carried out. Mix the prepared inhibitor with tap water 1:1 e...

Embodiment 2

[0029] Weigh 40g of fly ash from Taida Power Plant, dry it properly, and keep its moisture content at about 5%; add 50ml of alum buffer solution containing 0.7g / L of Al to soak for 24 hours, and stir continuously during this period to make it fully mixed. Put the mixture into a high-temperature furnace and raise the temperature to 100°C, gradually evaporate the water in it, cool and dry to obtain the phosphorus release inhibitor. The application method is the same as above, and the application effect is as follows: figure 2 . During the experiment, the average concentration of TDP in the water phase was 0.035, which reached the total phosphorus concentration standard (0.050mg / L) of Class C water body specified in GB12941-91 Water Quality Standard for Landscape and Recreational Water.

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Abstract

The present invention relates to water deposit phosphorus release treating and preventing issue and fuel burning power plant fly ash resource utilization. The preparation process of phosphorus release inhibitor for eutrophic water deposit includes the following steps: maintaining fly ash water content of 5-10 %; soaking fly ash in buffering alum solution for 12-48 hr while stirring; heating the mixture in furnace at 100-300 to fix Al of the solution inside fly ash; and cooling and drying the fly ash to obtain the phosphorus release inhibitor. When used, the inhibitor throwing amount is 5 kg / sq m. the present invention combines in-situ fixing technology and eutrophic salt deactivating technology to develop deposit phosphorus release inhibitor with fly ash as main material. The inhibitor has good use effect and low cost, and is suitable for treating and preventing of various kinds of eutrophic water. The present invention also provides new way for treating fly ash resource.

Description

technical field [0001] The invention relates to the control and prevention of the endogenous release of phosphorus in sediments in various water bodies; and the resource utilization of fly ash discharged from large coal-fired power plants. Background technique [0002] There are about 2,300 natural lakes in my country, with an area of ​​70,988 km 2 , accounting for about 0.8% of the total land area of ​​the country, and the total water storage capacity of lakes is more than 707.7 billion m 3 . According to statistics, the main lakes in our country are in eutrophication caused by nitrogen and phosphorus pollution, accounting for 56% of the statistical lakes. Once the water body enters the eutrophic stage, it will lose its proper function, cause great economic losses, and destroy the environmental landscape. With the continuous improvement of environmental management, the input of exogenous pollutants to the lake has been effectively controlled. However, the problem of lak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00
Inventor 孙红文胡智弢
Owner NANKAI UNIV