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Denitrification material based on sulfur autotrophic denitrification, preparation method and application

A technology of denitrification and sulfur autotrophy, applied in the field of water treatment, can solve problems such as difficulty in denitrification of water, and achieve the effects of low production cost, large specific surface area and low energy consumption

Pending Publication Date: 2021-06-29
SHANGHAI WATERWAY ENG DESIGN & CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method and application of a high-efficiency denitrification material based on sulfur autotrophic denitrification for the problem of difficult denitrification with low carbon-to-nitrogen ratio and high nitrogen-phosphorus ratio.

Method used

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  • Denitrification material based on sulfur autotrophic denitrification, preparation method and application
  • Denitrification material based on sulfur autotrophic denitrification, preparation method and application
  • Denitrification material based on sulfur autotrophic denitrification, preparation method and application

Examples

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Embodiment 1

[0032] Material preparation: Mix 45% of sulfur, 45% of limestone powder (100 mesh), and 9.5% of phosphorus-adsorbed saturated steel slag powder (100 mesh), heat and melt at 135-165°C, and then add 0.5% while stirring Sodium bicarbonate is used for foaming, then poured into an aluminum pan, left to cool and harden, and broken into blocks with a size of 3 to 5 mm to obtain a sulfur autotrophic denitrification denitrification material.

[0033] The prepared denitrification material is used as the filler of the denitrification filter. The filter is a plexiglass column with a diameter of 20cm and a height of 1.5cm. The influent is the tail water of the sewage treatment plant, and the concentration of nitrate nitrogen in the influent is 15-20mg / L , the phosphorus concentration is 0.1-0.25mg / L, and the hydraulic retention time is 2h. After 2 weeks of start-up period, the nitrate removal rate is stable above 99%, the total nitrogen removal rate is stable above 94%, and the phosphorus c...

Embodiment 2

[0035] Material preparation: Mix 45% sulfur, 40% limestone powder (300 mesh), and 10% phosphorus-adsorbed saturated steel slag powder (100 mesh), heat and melt at 180°C, and then add 5% carbonic acid while stirring Sodium hydrogen is used for foaming, then poured into an aluminum pan, allowed to cool and harden, and then broken into blocks with a size of 5-10 mm to obtain a sulfur autotrophic denitrification material.

[0036] The prepared denitrification material is used as the filler of the denitrification filter, the filter is a plexiglass column with a diameter of 20cm and a height of 1.5cm, the influent is the tail water of a sewage treatment plant with a certain amount of potassium nitrate added, and the concentration of nitrate nitrogen in the influent is The concentration of phosphorus is 20-40mg / L, the concentration of phosphorus is 0.1-0.25mg / L, and the hydraulic retention time is 6h. After 2 weeks of start-up period, the nitrate removal rate is over 95%, and the conc...

Embodiment 3

[0039] Material preparation: mix 49% sulfur powder (200 mesh), 45% shell powder (300 mesh), 5% struvite powder (100 mesh), 1% sodium bicarbonate, and use water as a binder , use a disc granulator to make 5-10mm round pellets, put them into an oven and heat them at 120°C for 3 hours, cool and harden, and obtain a sulfur autotrophic denitrification denitrification material.

[0040]The prepared denitrification material is used as the filler of the denitrification filter. The filter is a plexiglass column with a diameter of 20cm and a height of 1.5cm. The influent is the tail water of the sewage treatment plant, and the concentration of nitrate nitrogen in the influent is 20-40mg / L , The hydraulic retention time is 6h. After 2 weeks of start-up period, the nitrate removal rate is over 95%, and the nitrate removal rate is over 95%. or,

[0041] The prepared denitrification material is used as the filler of the denitrification filter. The filter is a plexiglass column with a diame...

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Abstract

The invention relates to a denitrification material based on sulfur autotrophic denitrification, which is prepared from sulfur, an alkalinity providing material, a slow-release phosphorus material and a foaming agent, wherein the sulfur accounts for 35-65%, carbonate powder accounts for 25-50%, the slow-release phosphorus material accounts for 5-15%, and the foaming agent accounts for 0.5-5%. The preparation method comprises the following steps: heating and melting the sulfur, the alkalinity providing material and the slow-release phosphorus material at 115-180 DEG C, uniformly mixing, adding the foaming agent, uniformly stirring, pouring the mixture into a mold, and cooling and molding to obtain the denitrification material; or heating and melting the sulfur, and then uniformly mixing the sulfur with the preheated alkalinity providing material and the phosphorus slow-release material; or uniformly mixing the materials, granulating by taking water as an adhesive, heating, fully adhering and cooling. Application of the denitrification material comprises deep removal of nitrogen in water in a water treatment process. The requirement for phosphorus in the denitrification process can be guaranteed, excessive release is avoided, the preparation technology is simple, energy consumption is low, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to the preparation and application of a sulfur autotrophic denitrification denitrification material. Background technique [0002] With the rapid growth of my country's economy and population, the problems of eutrophication and ecosystem degradation caused by excessive nitrogen input into water bodies are very prominent, which seriously threatens the ecological security of water bodies and the safety of drinking water. At present, biological denitrification is the most economical and efficient denitrification technology. Traditional heterotrophic denitrification uses carbon sources as electron donors to reduce nitrate nitrogen to N 2 or N 2 O, thereby removing nitrogen. When the carbon and nitrogen in the water to be treated is relatively low or there is no organic matter, such as tail water from sewage treatment plants, lightly polluted river and lake water, and groundwater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/2806C02F2101/163C02F2305/06
Inventor 岳冬梅赵东华郑岩皓葛俊束梦照
Owner SHANGHAI WATERWAY ENG DESIGN & CONSULTING
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