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Biological treatment method of municipal sewage

A technology for urban sewage and biological treatment, applied in biological water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. , the effect of reducing oxygen demand

Inactive Publication Date: 2017-03-22
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 treatment method of municipal sewage
  • Biological treatment method of municipal sewage

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Experimental program
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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; In the aerobic section, the reflux rate is 40%, and the remaining effluent enters the secondary sedimentation tank for sedimentation and separation, and the effluent is discharged through the discharge port; chitosan and grape seed tannin are added in the aerobic section, and the weight ratio is 1:0.5; The total dosage of polysaccharides and grape seed tannins 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; In the aerobic section, the reflux rate is 50%, and the remaining effluent enters the secondary settling tank for sedimentation and separation, and the effluent is discharged through the discharge port; chitosan and grape seed tannin are added in the aerobic section, and the weight ratio is 3:1.8; The total dosage of polysaccharides and grape seed tannins 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; In the aerobic section, the reflux rate is 45%, and the remaining effluent enters the secondary settling tank for sedimentation and separation, and the effluent is discharged through the discharge port; chitosan and grape seed tannin are added in the aerobic section, and the weight ratio is 1:1.8; The total dosage of polysaccharides and grape seed tannins 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...

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Abstract

The invention discloses a biological treatment method of municipal sewage. The method comprises the following steps: sewage is pretreated, and the pretreated sewage goes through a primary settlement tank, a biological tank and a secondary settlement tank and is treated, wherein the biological tank comprises an aerobic segment and an anoxic segment; outlet water from the primary settlement tank goes through a distribution well and simultaneously flows into the aerobic segment and the anoxic segment, outlet water from the aerobic segment enters the anoxic segment and is treated, one part of outlet water from the anoxic segment returns to the aerobic segment, the remaining outlet water enters the secondary settlement tank and undergoes precipitate separation, and outlet water is discharged through a discharging opening; and chitosan and grape seed tannin are added into the aerobic segment, and a weight ratio of chitosan to the grape seed tannin is (1-3):(0.5-1.8). The method can rapidly and effectively remove ammonia nitrogen in sewage.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a biological treatment method for urban 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 all contai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F101/16
CPCC02F1/001C02F1/66C02F3/302C02F9/00C02F2001/007C02F2101/16C02F2301/08
Inventor 莫显坤
Owner GUILIN SHIHUAN WASTE GAS TREATMENT EQUIP
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