Denitrifying filler, preparation method of denitrifying filler and application of denitrifying filler to denitrification of water body

A denitrification and water technology, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of no engineering value, long hydraulic retention time, and large sulfur consumption. Achieve the effect of reducing the content of sulfate ions too high, shortening the hydraulic retention time, and strong anti-interference ability

Inactive Publication Date: 2015-09-23
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at present, this technology consumes too much sulfur as a raw material, and the sulfate ion in the effluent is too high, resulting in serious secondary pollution of the system. In addition, due to the low proliferation rate of autotrophic microorganisms, the reaction starts slowly, and the hydraulic retention time is too long. Engineering value for practical application

Method used

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  • Denitrifying filler, preparation method of denitrifying filler and application of denitrifying filler to denitrification of water body

Examples

Experimental program
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preparation example Construction

[0020] In a second aspect, the present invention provides a method for preparing the denitrification filler described in the first aspect, comprising the following steps:

[0021] A. Prepare a mixed solution of surface modifier, surfactant and organic acid, wherein the concentration of the surface modifier is 5-10g / L, mix it evenly with sulfur particles with a particle size of 0.5-3cm, and let it stand for infiltration;

[0022] B. Taking out the sulfur particles obtained in step A, taking out and drying to obtain sulfur particles coated with a surface modifier.

[0023] Specifically, the surface modifier can be selected from chitosan products with an average relative molecular mass of 200,000-400,000, which are available on the market.

[0024] Preferably, in the step A, the surfactant includes Tween20 or polyethylene glycol octyl phenyl ether, and its amount accounts for 0.01-0.03 wt% of the surface modifier. Specifically, the organic acid can be acetic acid, and the config...

Embodiment 1

[0036] First, prepare the denitrification filler. The sulfur is melted, molded, and processed into small particles with a particle size of about 0.5-3cm, then immersed in a surface modifier solution for 2-3 hours, taken out and dried at 60-80°C to obtain sulfur coated with a surface modifier . The surface modifier solution consists of 5-10g / L chitosan with an average relative molecular mass of 200,000-400,000, adding a volume ratio of 1% acetic acid solution, heating to 50-60°C, and adding a weight ratio of 0.01-0.03% Tween20, stirred and dissolved. The limestone is crushed into granules, and the sulfur coated with surface modifier, limestone granules and plant residues are uniformly mixed according to the volume ratio of 1:0.2-0.5:0.5-2 to obtain the denitrification filler.

[0037] Secondly, 0.1-1vt% denitrification micrococcus and one or two kinds of denitrifying pseudomonas and 1-5vt% denitrification Thiobacillus were respectively inoculated into the denitrification fill...

Embodiment 2

[0049] This embodiment is basically the same as the first embodiment, except that polyethylene glycol octyl phenyl ether is used as the surfactant. After a stable biofilm is formed, continue to pump into the water to be denitrified, and the stable biofilm generated by the denitrification filler layer is used for denitrification treatment. The total nitrogen concentration of the newly pumped water was controlled at 10 mg / L, the hydraulic retention time was 6 hours, and the temperature was 15°C. The data of total nitrogen in the influent and effluent water was measured every three days. A total of three tests were performed. The test results are shown in Table 3.

[0050] table 3:

[0051]

[0052] It can be seen from the table that under the operating environment, the average removal rate of the conventional sulfur / limestone autotrophic denitrification (SLAD) system is 49.5%, the average removal rate of the present invention is 61.9%, and the denitrification performance is i...

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Abstract

The invention provides a denitrifying filler, a preparation method of the denitrifying filler and application of the denitrifying filler to denitrification of a water body. On the first aspect, a surface modifier is coated on the surface of sulfur granules, and the adsorptivity of the surface modifier and the positive charge on the surface modifier facilitates a microbial flora with negative charge to be grown on the surface of the sulfur granules in an attaching way; on the second aspect, heterotrophic denitrifying bacteria are increased in a conventional autotrophic denitrification microbic system to form a mixotrophic denitrification system, so that the breeding time is short, the antijamming capability is strong, the hydraulic retention time is relatively shortened, and the stability of the system and the adaptability of the system to external conditions are also improved; on the third part, the defects that secondary pollution is easily caused by overhigh sulfate ion content in effluent of a sulfur-based autotrophic denitrification system, land salinization is caused, and reusing of the effluent is not benefited are also greatly reduced by the denitrifying filler, and the denitrification performance is improved.

Description

technical field [0001] The invention relates to denitrification of water bodies, in particular to a denitrification filler, a preparation method thereof and an application in denitrification of water bodies. Background technique [0002] With the continuous improvement of the quality of life, people have higher and higher requirements for the environment they live in. The sparkling natural beauty has also quietly entered people's lives and become a pursuit of people's life. Therefore, landscape water bodies It also appears in people's lives. Generally, urban landscape water can be roughly divided into the following four types: natural lakes, man-made lakes, man-made landscape lakes and various landscape rivers. Urban landscape water is usually a closed water area, with low water self-purification capacity and small water environment capacity, resulting in the gradual enrichment of nitrogen, phosphorus and other substances in the landscape water, which in turn increases the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/34
Inventor 胡细全李兆华
Owner HUBEI UNIV
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