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A system and method for efficiently purifying domestic sewage

A high-efficiency technology for domestic sewage, applied in chemical instruments and methods, biological water/sewage treatment, multi-stage water/sewage treatment, etc., can solve problems affecting the operation of biochemical treatment systems, imbalance of nutrient ratio, low efficiency of nitrification, etc. Achieve the effects of saving nitrification aeration, improving reaction activity and reducing alkali consumption

Active Publication Date: 2022-04-19
江苏长三角智慧水务研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of sewage treatment in farms lies in denitrification. Because of its high ammonia nitrogen concentration and low C / N (carbon / nitrogen) ratio, it causes a serious imbalance in the nutrient ratio and affects the effective operation of the biochemical treatment system. The traditional nitrification method (activated sludge method or short-cut nitrification-denitrification-anammox combined method) with low efficiency

Method used

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  • A system and method for efficiently purifying domestic sewage
  • A system and method for efficiently purifying domestic sewage
  • A system and method for efficiently purifying domestic sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] A purification system for domestic sewage, such as figure 1 shown. Domestic sewage COD is 259mg / L, ammonia nitrogen is 34.7mg / L, total nitrogen is 46.4mg / L, total phosphorus is 3.1mg / L, and pH is 7.5. The system includes a primary sedimentation tank 1, an acidification tank 2, an aeration tank 3 and an anaerobic tank 4 connected in sequence. A return pipe is set between the acidification tank 2 and the aeration tank 3, and about 1 / 5 of the water is treated by the aeration tank. Return to the acidification tank.

[0131] The domestic sewage enters the primary sedimentation tank 1, and the domestic sewage after sedimentation treatment is transferred to the acidification tank 2; phosphorus-accumulating bacteria are added to the acidification tank 2, and the dosage is 3×10 9 CFU / mL (sewage), control the dissolved oxygen content of acidification tank 2 ≤ 0.2mg / L, after 12 hours of acidification, the supernatant BOD of acidification tank 2 5 About 80mg / L.

[0132] The dom...

Embodiment 2 and comparative example 1

[0138] The domestic sewage purification system and method are the same as in Example 1, the only difference is that the hydraulic retention time in the aeration tank of Example 2 and Comparative Example 1 is 36h and 48h respectively.

[0139] Table 1

[0140]

[0141]

Embodiment 3～4 and comparative example 2

[0143] The denitrification method of domestic sewage is the same as that of Example 1, the only difference being that the dissolved oxygen in the aeration tanks in Examples 3-4 and Comparative Example 2 are 1.0-1.5mg / L, 1.6-1.8mg / L and 2.0- 2.2mg / L.

[0144] Table 2

[0145]

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Abstract

The invention provides a system and method for efficiently purifying domestic sewage. The system includes a primary sedimentation tank (1), an acidification tank (2), an aeration tank (3) and an anaerobic tank (4) connected in sequence. The pool (1) is used for sedimentation treatment of domestic sewage, and the domestic sewage after sedimentation treatment is transferred to the acidification pool (2); the acidification pool (2) is used for the degradation of organic matter by microorganisms; Oxygen-containing gas and nitrous bacteria are added to convert ammonia nitrogen into nitrite ion form through nitrification, and phosphorus-accumulating bacteria in domestic sewage are used to remove phosphorus; the anaerobic tank (4) is used to receive the aeration tank (3) The treated domestic sewage supernatant is denitrified by denitrification. The present invention mainly uses the combination of chemical precipitation and microbial phosphorus removal to remove phosphorus, and uses NH 4 + —NO 2 ‑ —N 2 For the denitrification route, the effective management of denitrification and phosphorus removal of domestic sewage has been realized to ensure that domestic sewage will not affect human health during human activities.

Description

technical field [0001] The invention relates to the field of domestic sewage treatment, in particular to a system and method for efficiently purifying domestic sewage. Background technique [0002] With the rapid development of economy and the acceleration of urbanization process, the discharge of domestic sewage is increasing day by day, and the eutrophication of water body is becoming more and more serious. At the same time, people's awareness of health and environmental protection is gradually increasing, and environmental protection discharge standards and drinking water standards are constantly mentioned. How to remove nitrogen and phosphorus economically and effectively has become the focus of attention and research hotspots of environmental workers. [0003] The methods of phosphorus removal from sewage include chemical precipitation, electrolysis, biological method, physical adsorption method, membrane technology treatment method and constructed wetland treatment met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F9/00C02F2001/007C02F2101/30C02F3/34C02F3/302
Inventor 刘敏
Owner 江苏长三角智慧水务研究院有限公司
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