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Special filler for nitrate nitrogen removal using sulfur-iron coupling technology, and preparation method thereof

A nitrate nitrogen technology, which is applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of inability to ensure full utilization of fillers, sludge expansion, etc. High mechanical strength and stable operation

Inactive Publication Date: 2019-06-14
SUZHOU FANGZHOU ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of S-Fe synergistic autotrophic denitrification to remove nitrate in low carbon / nitrogen ratio water has a good application prospect. In the prior art, this kind of filler is layered into the autotrophic bioreactor. At the same time, inoculate the domesticated activated sludge into the reactor, pass the nitrate-containing sewage into the reactor in sequence, and let it stand still. Due to the presence of sludge in this kind of filler, the problem of sludge bulking is prone to occur. At the same time, the filling position is basically stable, and the full utilization of the filling cannot be guaranteed.

Method used

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  • Special filler for nitrate nitrogen removal using sulfur-iron coupling technology, and preparation method thereof
  • Special filler for nitrate nitrogen removal using sulfur-iron coupling technology, and preparation method thereof
  • Special filler for nitrate nitrogen removal using sulfur-iron coupling technology, and preparation method thereof

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preparation example Construction

[0028] A method for preparing a special packing for removing nitrate nitrogen by sulfur-iron coupling technology, comprising the following steps:

[0029] Step 1. Prepare surface modifier, surfactant and a mixed solution with several sections, wherein the concentration of surface modifier is 5-10g / L, mix it with sulfur particles evenly, and let it stand for infiltration;

[0030] Step 2, taking out the sulfur granules obtained in step 1 and drying to obtain sulfur granules with a surface modifying agent on the surface;

[0031] Step 3: Mix the sulfur granules coated with the surface modifying agent prepared in step 2 evenly with limestone granules, pyrite granules and denitrifying bacteria immobilized granules.

Embodiment 1

[0033] The filler of the invention is used to treat simulated nitrate sewage. Mix sulfur particles, limestone particles, pyrite particles and denitrifying bacteria immobilized particles with particle diameters of 5mm, 4mm, 3mm and 3mm evenly according to the mass ratio of 5:1:2:4, and put them in the reactor. Sodium nitrate is added to tap water to prepare water with a nitrate nitrogen concentration of 60mg / L to simulate the water quality of sewage. The raw water is injected into the reactor through a peristaltic pump, and the sewage and fillers are continuously stirred in the reactor. The residence time of sewage in the reactor is After 60 minutes, it was detected that the content of nitrate nitrogen in the water was lower than 3mg / L, and the removal rate was greater than 95%. After a long-term running test, the quality of the effluent is stable and can meet the discharge standard. The monitoring data are shown in Table 1:

[0034] Table 1 is the detection data of embodiment...

Embodiment 2

[0037] The filler of the invention is used to treat simulated nitrate sewage. The sulfur particles, limestone particles, pyrite particles and denitrifying bacteria immobilized particles with particle diameters of 5mm, 3mm, 3mm and 4mm were mixed evenly according to the mass ratio of 6:1.5:1.5:5, and packed into the reactor. Sodium nitrate is added to tap water to make water with a concentration of nitrate nitrogen of 80mg / L to simulate the water quality of sewage. The raw water is injected into the reactor through a peristaltic pump, and the sewage and filler are continuously stirred in the reactor. The residence time of sewage in the reactor is After 60 minutes, it was detected that the content of nitrate nitrogen in the water was lower than 3mg / L, and the removal rate was greater than 95%. After long-term running and testing, the quality of the effluent is stable and can meet the discharge standards. The monitoring data are shown in Table 2:

[0038] Table 2 is the detectio...

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Abstract

The invention discloses a special filler for nitrate nitrogen removal using a sulfur-iron coupling technology, and a preparation method thereof. The filler comprises, by mass, 40-60% of elemental sulfur, 10-15% of limestone, 15-25% of pyrite and 30-40% of denitrifying bacteria immobilized particles. Autotrophic denitrifying bacteria utilize the limestone to synthesize cells, the pyrite is used asan electron donor for nitrate reduction to complete the denitrification process, the denitrifying bacteria immobilized particles provide denitrifying bacteria to complete removal of nitrogen from thewastewater, and all the above components are designed to be granular to make the filler sufficiently stirred in order to ensure the full utilization of the filler.

Description

technical field [0001] The invention relates to the application field of water treatment technology, in particular to a special filler for removing nitrate nitrogen by sulfur-iron coupling technology and a preparation method thereof. Background technique [0002] Studies have shown that nitrogen is one of the main factors leading to eutrophication of water bodies. In the treatment of eutrophication problems in water bodies, reducing the nitrogen content in water has become the top priority. The traditional denitrification technology is biological nitrification and denitrification, but the denitrification of this technology needs to consume a large amount of dissolved organic matter or carbon source, and the carbon source of the landscape water body is seriously insufficient, and the denitrification effect is extremely poor. In recent years, autotrophic denitrification technology has attracted much attention. Compared with traditional denitrification technology, autotrophic d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
Inventor 陈振国任伟张力桢陈鹤元
Owner SUZHOU FANGZHOU ENVIRONMENTAL PROTECTION TECH CO LTD
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