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Method and device removing nitrates from water body by single-stage autotrophic denitrification

A technology of autotrophic denitrification and nitrate, applied in chemical instruments and methods, anaerobic digestion treatment, biological water/sewage treatment, etc., can solve the problem of low organic matter content, increased operating costs and floor space, and lack of biological reaction Basic conditions for nitrification and denitrification, etc.

Inactive Publication Date: 2013-04-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the quality of surface water is very different from that of sewage, and the content of organic matter is very low, which does not meet the basic conditions for biological denitrification.
However, the heterotrophic denitrification denitrification method using an external carbon source often needs to add a second-level carbon removal system due to excessive dosage.
The secondary denitrification system not only increases the infrastructure cost, but also greatly increases the operating cost and floor space
These all limit the application of external carbon source technology in practical engineering

Method used

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  • Method and device removing nitrates from water body by single-stage autotrophic denitrification

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Embodiment 1

[0027] The biofilter structure that the present invention adopts is as figure 1 shown. Use the raw water pump 3 to take out the raw water 1 of the water body to be treated, transport the raw water 1 into the biofilter 6 through the water inlet pipe 2, install a static mixer 5 on the water inlet pipe of the biofilter, and convey the electron donor solution delivery pipe 4 The electron donor solution and the surface raw water 1 transported by the water inlet pipe 2 are fully mixed in the static mixer 5, and then enter the biofilter 6. The dosage of the electron donor solution and the nitrate content in the raw water are the molar ratio of sulfur to nitrogen S / N=1:1. The water flow in the biofilter 6 adopts the form of upward flow. The bottom of the filter is a gravel support layer 7, and the upper part is a ceramsite filter layer 8. After the denitrification process is completed in the biofilter 6, the raw water flows out of the biological filter through the outlet pipe 9. Fil...

Embodiment 2

[0035] The device for single-stage autotrophic denitrification to remove nitrate from water mainly includes a biofilter, with a water inlet pipe at the bottom of the biofilter and an outlet pipe at the top, so the water entering the biofilter is from bottom to bottom. on the flow. The diameter of the biofilter is 200mm and the height is 3m. The gravel support layer and the ceramsite filter layer are arranged from bottom to top in the biofilter. The height of the gravel support layer is 0.3m, and the particle size of the gravel used is 8 ~16mm, the height of the ceramsite filter layer is 1.7m, and the particle size of the ceramsite used is 6~9mm. The inlet of the water inlet pipe extends into the surface water body, and a raw water pump is installed on the water inlet pipe to extract the water body. In addition, a static mixer is arranged on the water inlet pipe, and the static mixer is connected to the electron donor solution delivery pipe, and the raw water pumped The raw wa...

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Abstract

The invention relates to a method and device removing nitrates from a water body by single-stage autotrophic denitrification. In a biological filter, haydite is used as a filtering medium for attached growth of denitrifying microorganisms. A (sodium thiosulfate, sodium sulfite and sodium sulfide) solution is added in influent water of the biological filter to supplement electron donors required by denitrification, and purified water flows into the lake surface water body. By using single-stage autotrophic denitrification, the invention can quickly and efficiently remove nitrates in the water body, thereby enhancing the quality of the treated water and lowering the probability of eutrophication in the receiving lake water body.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering water treatment, and in particular relates to a single-stage autotrophic denitrification method for removing nitrate in water and a device for removing nitrate in water by using a ceramsite type biological filter tank or the like. Background technique [0002] Most of the urban landscape lakes in my country are facing the serious situation of water pollution and lake eutrophication. As an important measure to ensure lake water quality and landscape effects, water diversion has been applied in more and more urban landscape lake governance processes. However, water diversion sources are often in different degrees of pollution, and there is a common problem of high nitrogen content. This is a common problem in water diversion programs for eutrophication control of lakes in my country, and targeted scientific research is urgently needed. [0003] Because surface water bodies such as...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/28
Inventor 何圣兵周伟丽陈雪初刘佃娜董晓静应智渊
Owner SHANGHAI JIAO TONG UNIV
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