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Biological denitrification method for domestic sewage

A technology for biological denitrification and domestic sewage, applied in biological water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of large energy consumption and increased treatment costs, and achieve reduced energy consumption, The effect of oxygen demand reduction

Inactive Publication Date: 2017-02-15
GUILIN SHIHUAN WASTE GAS TREATMENT EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only that, the traditional biological denitrification process, such as A / O method, A 2 Aeration in the nitrification stage such as the / O method usually consumes a lot of energy. In order to neutralize the acidity generated during the nitrification process, alkali needs to be added to neutralize it, which increases the treatment cost.

Method used

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  • Biological denitrification method for domestic sewage
  • Biological denitrification method for domestic sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After the sewage is pretreated by the coarse grid and the aeration grit chamber, it is treated in turn through the primary sedimentation tank, the biological tank and the secondary sedimentation tank. The biological tank includes an aerobic section and an anoxic section; The well flows into the aerobic section and the anoxic section at the same time, 60% is allocated to the anoxic section, and the remaining 40% is allocated to the aerobic section; section, the reflux rate is 40%, the remaining effluent enters the secondary settling tank for sedimentation and separation, and the effluent is discharged through the discharge port; zeolite powder and grape seed tannin are added in the aerobic section, and the weight ratio is 1:0.5; zeolite powder The total amount of dosing and grape seed tannin is 0.5kg / ton sewage; the DO in the aerobic section is 0.8mg / L; the DO in the anoxic section is 0.2mg / L.

Embodiment 2

[0024] After the sewage is pretreated by the coarse grid and the aeration grit chamber, it is treated in turn through the primary sedimentation tank, the biological tank and the secondary sedimentation tank. The biological tank includes an aerobic section and an anoxic section; The well flows into the aerobic section and the anoxic section at the same time, 80% is allocated to the anoxic section, and the remaining 20% ​​is allocated to the aerobic section; section, the reflux rate is 50%, the remaining effluent enters the secondary settling tank for sedimentation and separation, and the effluent is discharged through the discharge port; zeolite powder and grape seed tannin are added in the aerobic section, and the weight ratio is 3:1.8; zeolite powder The total amount of dosing and grape seed tannin is 5kg / ton sewage; the DO in the aerobic section is 1.0mg / L; the DO in the anoxic section is 0.5mg / L.

Embodiment 3

[0026] After the sewage is pretreated by the coarse grid and the aeration grit chamber, it is treated in turn through the primary sedimentation tank, the biological tank and the secondary sedimentation tank. The biological tank includes an aerobic section and an anoxic section; The well flows into the aerobic section and the anoxic section at the same time, 70% is allocated to the anoxic section, and the remaining 30% is allocated to the aerobic section; section, the reflux rate is 45%, the remaining effluent enters the secondary settling tank for sedimentation and separation, and the effluent is discharged through the discharge port; zeolite powder and grape seed tannin are added in the aerobic section, and the weight ratio is 1:1.8; zeolite powder The total amount of dosing and grape seed tannin is 2.5kg / ton sewage; the DO in the aerobic section is 0.9mg / L; the DO in the anoxic section is 0.4mg / L.

[0027] The sewage treatment process of the embodiment of the present inventi...

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Abstract

The invention discloses a biological denitrification method for domestic sewage. After being pretreated, sewage sequentially flows through a primary settling tank, a biological tank and a secondary settling tank to be treated, and the biological tank comprises an aerobic section and an anoxic section; the effluent of primary settling tank simultaneously flows into the aerobic section and the anoxic section through a distribution well, the effluent of the aerobic section flows into the anoxic section to be treated, one part of the effluent of the anoxic section flows back to the aerobic section, and the rest effluent flows into the secondary settling tank to be subjected to precipitation separation, and the effluent is discharged through a discharge outlet; and zeolite powder and grape seed tannin are fed into the aerobic section in a weight ratio of (1-3) to (0.5-1.8). By virtue of the process, ammonia nitrogen in the sewage can be rapidly and effectively removed.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a biological denitrification method for domestic sewage. Background technique [0002] Nitrogen is a very important pollution factor in the water environment. With the development of petrochemical, food and pharmaceutical industries and the improvement of people's living standards, the nitrogen content in urban sewage, industrial sewage and garbage permeate has risen sharply. Nitrogen in sewage The main forms of nitrogen are molecular nitrogen, organic nitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen, and in the untreated raw wastewater, organic nitrogen and ammonia nitrogen are the main forms of nitrogen; Ammonia nitrogen and nitrate nitrogen are the main forms of nitrogen in the effluent after secondary biochemical treatment. According to reports, urban domestic sewage, industrial wastewater, and livestock and poultry breeding wastewater a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30
CPCC02F3/301C02F3/303C02F9/00C02F2001/007C02F2301/043C02F2303/24
Inventor 莫显坤
Owner GUILIN SHIHUAN WASTE GAS TREATMENT EQUIP
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