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A high-efficiency denitrification system and method based on two-stage ao oxidation ditch series connection

An oxidation ditch, two-stage technology, applied in chemical instruments and methods, multi-stage water treatment, water/sewage multi-stage treatment, etc., can solve problems such as high operating costs, increased oxygen consumption, organic matter consumption, etc., and achieve head loss. The effect of small, low water flow rate and high removal rate

Active Publication Date: 2021-11-19
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to accurately control the respective volumes and dissolved oxygen concentrations of the aerobic zone and the anoxic zone in the same ditch of the circulating baffled oxidation ditch. Therefore, when the operating state is not good, the denitrification effect is limited. Inner pair has almost no effect on phosphorus removal, and because there is no clear boundary between the aerobic zone and the anoxic zone, the concentration of organic matter in the aerobic zone is almost the same as that in the anoxic zone, resulting in a large amount of organic matter being consumed by heterotrophic metabolism, resulting in carbon Source waste increases unnecessary oxygen consumption, resulting in higher operating costs
In addition, in order to avoid sludge deposition in the oxidation ditch, a certain flow rate needs to be maintained, and several hydraulic propulsion devices need to be arranged, resulting in large energy consumption

Method used

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  • A high-efficiency denitrification system and method based on two-stage ao oxidation ditch series connection
  • A high-efficiency denitrification system and method based on two-stage ao oxidation ditch series connection
  • A high-efficiency denitrification system and method based on two-stage ao oxidation ditch series connection

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Embodiment 1

[0040] Such as figure 2 Or as shown in 3, a high-efficiency denitrification system based on two-stage AO oxidation ditch in series, including the first AO oxidation ditch, the second AO oxidation ditch, the first AO oxidation ditch and the second AO oxidation ditch The structure and shape are consistent with the common Carrousel oxidation ditch, but the operation and equipment are significantly different from the common oxidation ditch process. Among them: the first AO oxidation ditch is composed of the first anoxic zone, the first precipitation zone and the first aerobic zone, of which The water inlet of the first anoxic zone is connected to the water inlet, the water outlet of the first anoxic zone is connected to the water inlet of the first sedimentation zone, and the water outlet of the first sedimentation zone is connected to the water inlet of the first aerobic zone connected, the water outlet of the first aerobic zone is connected to the water inlet of the first anoxi...

Embodiment 2

[0047] Such as figure 1 and Figure 4 As shown, depending on Embodiment 1, a third anoxic zone is added after the first oxidation ditch precipitation zone, and the first oxidation ditch uses a pump to return sewage from the end of the first aerobic zone to the beginning of the third anoxic zone. At the end of the second stage of the oxidation ditch, the sewage is pumped back from the end of the second aerobic zone to the head of the second anoxic zone.

[0048] Therefore, the sewage process in the first oxidation ditch is: water inflow→first anoxic zone→first sedimentation zone→outflow; the cycle of sludge in the ditch is: first anoxic zone→first sedimentation zone→third anoxic zone→the first aerobic zone→the first anoxic zone; the internal circulation is: the first aerobic zone→the third anoxic zone.

[0049] The sewage sludge process in the second oxidation ditch is: the second anoxic zone → the second aerobic zone → the second sedimentation zone; the return flow of the ni...

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Abstract

The invention discloses a high-efficiency denitrification system and method based on the series connection of two-stage AO oxidation ditch. The three reaction zones of oxygen and precipitation are used as the second stage of oxidation ditch, and the two oxidation ditches are connected in series to form two stages of AO denitrification process, and each oxidation ditch has a two-corridor structure. Raw sewage passes through the anoxic zone and sedimentation zone of the first stage of oxidation ditch, where mud and water are separated, and the settled sludge flows back into the anoxic zone from the slit, and then airlifts back to the aerobic zone in this section, where it settles The sewage separated from the first stage directly enters the oxidation ditch of the second stage; the sewage in the second stage passes through the anoxic zone, the aerobic zone and the sedimentation zone, and the settled sewage is discharged out of the system. The invention is suitable for treating sewage from low-carbon sources, and has relatively simple process flow, low energy consumption, convenient operation and management, high total nitrogen removal rate, and is suitable for occasions that require high total nitrogen removal rate and insufficient carbon source .

Description

technical field [0001] The invention belongs to the technical field of water environment protection, and in particular relates to a high-efficiency denitrification system based on two-stage AO oxidation ditch connected in series. Background technique [0002] In sewage treatment, the use of oxidation ditch, AN / O, etc. to achieve nitrogen removal is the most widely used. AN / O process is the basic method of biological nitrogen removal, and it is also the simplest and most basic method. However, it is difficult to improve the total nitrogen removal rate of this method, and it can only be maintained at about 70%. Moreover, the requirement of this method for carbon sources is that the influent BOD5 / TN is not less than 4, which is difficult for most municipal sewage to meet. [0003] Oxidation ditch process is one of the most widely used technologies in urban sewage treatment plants. Oxidation ditch is an activated sludge treatment system. Its aeration tank is a closed circulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/52C02F3/302C02F2203/006C02F2209/16C02F2301/046C02F2301/08C02F2303/14
Inventor 唐玉朝
Owner ANHUI UNIVERSITY OF ARCHITECTURE