Two-stage a/o partial short-range series fixed bed multi-stage a/o autotrophic denitrification device and method

An autotrophic denitrification and fixed bed technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the problems of increased treatment costs and secondary pollution of sludge, and achieves Effects of reducing difficulty, saving cost, and reducing sludge output

Active Publication Date: 2021-11-26
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0002] The phenomenon of "heavy water and light mud" in the field of sewage treatment is common today, and the generation of a large amount of excess sludge can easily cause secondary pollution of sludge and increase the cost of treatment

Method used

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  • Two-stage a/o partial short-range series fixed bed multi-stage a/o autotrophic denitrification device and method

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specific Embodiment approach 1

[0024] Specific implementation mode one: combine figure 1 As shown, this embodiment relates to a two-stage A / O partial short-range series fixed bed multi-stage A / O autotrophic denitrification device, which is characterized in that the main body of the process mainly includes a raw water tank (1), an A / O partial short-range reactor (2), intermediate water tank (3), fixed bed multi-stage A / O autotrophic denitrification reactor (4), secondary settling tank (4.6), characterized in that the raw water tank (1) passes through the water inlet pump (1.4) It is connected with the anoxic zone (2.1) of the A / O part short-range reactor (2); the described anoxic zone (2.1) is connected with the aerobic zone (2.2); the described anoxic zone is provided with a stirrer (2.12 ) is provided with an aeration head (2.3) in the aerobic zone (2.2), and oxygen is provided by an aeration pump (2.8); the anoxic zone (2.1) and the aerobic zone (2.2 ) volume ratio is 1:3; the sludge discharge of the A / O...

specific Embodiment approach 2

[0025] Specific implementation mode 2: This implementation mode relates to an application method of a two-stage A / O partial short-range series fixed bed multi-stage A / O autotrophic denitrification device, which is carried out according to the following steps:

[0026] 1. Inoculation sludge stage

[0027] Inoculate the reflux sludge of the secondary settling tank of the urban sewage treatment plant in the A / O part of the short-range reactor, control the sludge concentration MLSS to 2500-3500mg / L, and take the actual domestic sewage as the treatment object, and the sludge reflux ratio is 100%. The DO in the aerobic reaction zone is controlled to 1-3mg / L in the first aerobic grid according to the water flow direction, 0.8-1mg / L in the second grid, and DO in the last grid to make it less than 0.5mg / L. The hydraulic retention time is designed to be 45-60min in the anoxic zone and 135-180min in the aerobic zone. The sludge age HRT is designed to be 4-6 days, and a shorter HRT ensur...

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Abstract

The invention relates to a two-stage A / O partial short-range series fixed bed multi-stage A / O autotrophic denitrification device and method, belonging to the technical field of urban sewage biological treatment. The main body of the process is composed of four parts: urban sewage raw water tank, continuous flow A / O partial short-range device, intermediate water tank and fixed bed multi-stage A / O autotrophic denitrification device. The short-path is realized in the A / O reactor through process adjustment, and the short-path sludge generated in the A / O reactor is directly fed into the multi-stage A / O autotrophic denitrification device in the later stage to maintain the autotrophic denitrification in the latter stage. nitrogen. The present invention can not only reduce the amount of sludge, but also make the front and rear stages have denitrification effect at the same time, and finally realize the stable, deep and efficient denitrification of the system.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and specifically relates to a device and application method for treating low-carbon source urban sewage by a two-stage A / O partial short-range series fixed bed multi-stage A / O autotrophic denitrification process, which has high efficiency and energy saving , deep denitrification, and sludge reduction characteristics, suitable for new urban sewage treatment plants and other technical fields. Background technique [0002] The phenomenon of "heavy water and light mud" in the field of sewage treatment is common today, and the generation of a large amount of excess sludge can easily cause secondary pollution of sludge and increase the cost of treatment. Therefore, when we develop new processes, we not only need to achieve advanced treatment of sewage, but also try to achieve sludge reduction and resource utilization. [0003] The emergence of anaerobic ammonium oxidation has made ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/30C02F101/16
CPCC02F3/12C02F3/302C02F3/307C02F2101/16Y02W10/10
Inventor 彭永臻王梓豪张亮
Owner BEIJING UNIV OF TECH
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