Autotrophic nitrogen removal device adopting low-carbon-source urban sewage step-feed multi-stage A/O (Anoxic-Oxic) process based on short-cut denitrification and application method

A technology for short-range denitrification and urban sewage

Active Publication Date: 2016-07-20
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the bottleneck limiting the application of anammox technology in urban sewage treatment plants is mainly the substrate NO required for anammox reaction. 2 - no steady supply
In general, the substrate NO 2 - Obtained mainly from short-range nitrification (NH 4 + Only oxidized to NO 2 - ), however, due to the particularity of low-carbon source urban sewage water quality (raw water NH 4 + low concentration and large fluctuations in water quality and quantity), which restricts the stability of short-range nitrification of low-carbon source urban sewage, so it cannot provide sufficient and stable NO for the anaerobic ammonium oxidation reaction 2 - supply

Method used

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  • Autotrophic nitrogen removal device adopting low-carbon-source urban sewage step-feed multi-stage A/O (Anoxic-Oxic) process based on short-cut denitrification and application method

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specific Embodiment approach 1

[0025] Specific Embodiment 1: This embodiment is an autotrophic denitrification device based on short-range denitrification of low-carbon source urban sewage segmented water intake multi-stage A / O process, which is characterized in that the device includes urban sewage raw water tank 1 and segmented water intake multi-stage A / O device;

[0026] The upper end of the urban sewage raw water tank 1 is provided with a water inlet pipe 23 and an overflow pipe 24, and the lower end is provided with an emptying pipe 25; the multi-stage A / O device for segmented water inlet is divided into seven zones by a perforated partition, Along the direction of water inflow are the first anoxic reaction zone 2, the first contact oxidation zone 3, the second anoxic reaction zone 4, the second contact oxidation zone 5, the third anoxic reaction zone 6, and the second anoxic reaction zone. The three-section contact oxidation zone 7 and the precipitation zone 8; the urban sewage raw water tank 1 adop...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment is different from Embodiment 1 in that: the sponge 18 is fixed on the packing frame, and the filling ratio is 30-50%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0031] Specific implementation method three: the application method of the autotrophic denitrification device based on the short-range denitrification-based low-carbon source urban sewage segmented multi-stage A / O process, according to the following steps:

[0032] 1. Inoculation initiation phase

[0033] The first-stage contact oxidation reaction zone 3, the second-stage contact oxidation reaction zone 5 and the third-stage contact oxidation reaction zone 7 are all inoculated with polypropylene hollow ring 19 fillers with nitrifying properties and mature film formation, and the filling ratio reaches 40-60. %; Start water pump 10 to inject municipal sewage in the reactor, then start air compressor 13 and open the air rotor flowmeter, contact oxidation reaction zone 3 for the first section, contact oxidation reaction zone 5 for the second section and contact the third section The oxidation reaction zone 7 is aerated to maintain the dissolved oxygen concentration DO = 3 ~ 5mg / L,...

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Abstract

The invention relates to an autotrophic nitrogen removal device adopting a low-carbon-source urban sewage step-feed multi-stage A / O (Anoxic-Oxic) process based on short-cut denitrification and an application method. A device main body consists of an urban raw sewage tank and a step-feed multi-stage A / O device, wherein the step-feed multi-stage A / O device is partitioned into seven areas through perforated partition boards, namely, three segments of anoxic reaction areas, three segments of contact oxidization reaction areas and a precipitation area; sponge fillers with high denitrifying ammonium oxidation activity are inoculated into the three segments of anoxic reaction areas, and undergo a short-cut denitrification reaction and an anaerobic ammonium oxidation reaction to remove nitrogen; polypropylene hollow ring fillers which have high nitrification performance and have mature biofilm formation are inoculated into the three segments of contact oxidization reaction areas, and undergo a nitrification reaction to provide a substrate for short-cut denitrification. The device is suitable for treatment of low-carbon-source urban sewage, has the advantages of high efficiency, energy saving, small floor area and convenience in water plant upgrading and rebuilding, and belongs to the technical field of sewage biological treatment.

Description

technical field [0001] The invention relates to an autotrophic denitrification device and an application method based on a short-range denitrification-based low-carbon source urban sewage sub-inflow multi-stage A / O process. Background technique [0002] The traditional biological denitrification technology is to convert ammonia nitrogen (NH 4 + ) into nitrate nitrogen (NO 3 - ), and then nitrate nitrogen (NO 3 - ) into nitrogen (N 2 ), so as to achieve the purpose of removing nitrogen from water. In this technology, 1molNH in the process of nitrification 4 + Oxidized to 1molNO 3 - Need to consume 1.9mol of oxygen (O 2 ), synthesized 3.4g organisms; in the subsequent denitrification process, 1molNO 3 - Reduction to 0.5molN 2 It needs to consume 57g COD and generate 17g of organisms, so the raw sewage C / N (COD / TN) is required to be 4.07. However, the C / N of most actual urban sewage or industrial wastewater is lower than 4.07. In order to achieve the purpose of e...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/302C02F3/305C02F3/307
Inventor 彭永臻刘文龙马斌王淑莹马琳娜
Owner HARBIN INST OF TECH
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