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Method and apparatus for depth nitrogen and phosphorus removal from small-flow sewage

A deep denitrification, small flow technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Complex problems, etc., to achieve high-flow sludge return, reduce aeration energy consumption, and reduce the size of the reactor

Active Publication Date: 2016-03-02
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the treatment of small flow sewage in rural areas, due to the lack of professional managers, the traditional new methods of nitrogen and phosphorus removal, such as A 2 O, etc., due to the complexity of the method and the high difficulty of management, it is difficult to promote and use
In addition, in the traditional method, the effect of nitrogen and phosphorus removal is not good due to the limited reflux of nitrifying liquid and insufficient utilization of organic carbon.
Currently widely studied new denitrification methods, such as ANAMMOX and short-cut nitrification and denitrification, due to harsh operating conditions, are difficult to be widely used in domestic sewage treatment where the concentration of ammonia nitrogen is not high, the water quality and quantity vary greatly, and the requirements for effluent water quality are constantly improving.
Membrane bioreactor membranes are costly and complex in operation and management, so far they have not been widely used for domestic sewage treatment and discharge

Method used

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  • Method and apparatus for depth nitrogen and phosphorus removal from small-flow sewage

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Embodiment 1

[0035] figure 1 It is a structural schematic diagram of a device for deep denitrification and dephosphorization of sewage with small flows according to the present invention. Such as figure 1As shown, a device for deep denitrification and dephosphorization of sewage with a small flow rate includes a reaction tank, a sedimentation tank 3 and a control device 4. The reaction tank is provided with a partition 8 to divide the reaction tank into aeration / The stirring alternate zone 1 and the oxygenation zone 2, the bottom of the sedimentation tank 3 is funnel-shaped, the bottom is provided with a sedimentation tank mud bucket 17, the upper part of the sedimentation tank 3 is provided with a sedimentation tank outlet weir 15; the aeration / stirring alternate zone 1 is equipped with The first aeration device and the stirring device 6, the oxygenation zone 2 is provided with the second aeration device, and the control device 4 is connected with the first aeration device, the stirring...

Embodiment 2

[0044] An example of deep denitrification and dephosphorization of domestic sewage by using the device described in Example 1. Using conventional domestic sewage, the treated water volume is about 50 tons / day. Influent water quality characteristics: COD~350 mg / L, TSS~150 mg / L, TN~29 mg / L, ammonia nitrogen~18 mg / L, TP~3.8 mg / L. Control parameters: the alternating area is controlled to aerate for 1 hour each time, and then stir for 1 hour. During aeration, the dissolved oxygen is controlled at about 2 mg / L, the hydraulic retention time of the alternating area is about 10 hours, and the hydraulic retention time of the oxygenation area In about 2 hours, the water temperature is about 20 degrees.

[0045] After the system is stabilized, after a one-month follow-up test, the average concentration of effluent pollutants is: COD~25 mg / L, TSS~9.4 mg / L, TN~8.2 mg / L, ammonia nitrogen~0.2 mg / L, TP ~0.4 mg / L, the effluent quality fully meets the first-class A standard in my country's "Pol...

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Abstract

The present invention discloses a method and an apparatus for depth nitrogen and phosphorus removal from small-flow sewage. The method comprises the following steps: feeding sewage to an alternating region in a continuous flow manner at first, alternately carrying out aeration and stirring, and removing nitrogen and phosphorus in the same tank; feeding treated sewage into an oxygenating region of the reaction tank to further remove BOD, ammonia nitrogen and total phosphorus; and then, feeding the sewage into a sedimentation tank to separate mud from water. According to the method and apparatus disclosed by the present invention, through aeration and stirring which are carried out alternately, nitrification-denitrification and phosphorus release-polyphosphate are realized in the same tank; a mud-water internal circulation pump is not required; the method is simple; organic carbon can be fully used; nitrogen and phosphorous removal efficiency is high; intermittent aeration is adopted to improve aeration efficiency and reduce aeration energy consumption; nitrate is fully used as an electron acceptor, so that system oxygen demand is reduced, and treatment power consumption is low; the quality of yielded water is stable, and ammonia nitrogen and phosphate are not accumulated; and by the gas stripping effect generated with the aid of aeration, sludge reflux is realized, so that a sludge reflux pump is not needed; and a reflux flow of the sludge is large, so that a system can maintain a higher sludge concentration, and the volume of a reactor is reduced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, more specifically, to a method and device for deep denitrification and dephosphorization of small flow sewage. Background technique [0002] Although my country has built a large number of centralized urban sewage treatment plants, the sewage treatment rate in towns and rural areas is still lower than 20%. For rural sewage, it is suitable to adopt decentralized sewage treatment methods to reduce the cost of sewage pipe network construction. In the treatment of small flow sewage in rural areas, due to the lack of professional managers, the traditional new methods of nitrogen and phosphorus removal, such as A 2 O etc., because the method is complicated, the management difficulty is high, it is difficult to popularize and use. In addition, in the traditional method, the effect of nitrogen and phosphorus removal is not good due to the limited reflux of nitrifying liquid and insufficient ut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16
Inventor 刘国强
Owner JINAN UNIVERSITY
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