Anaerobic ammonia oxidation-based low-carbon nitrogen ratio urban sewage denitrification system and treatment process

A technology of anaerobic ammonium oxidation and urban sewage, applied in the field of sewage biological treatment, can solve the problems of high energy consumption and material consumption in operation, large surplus sludge output, and consumption of organic carbon sources, etc. The effect of low throughput and short start-up time

Active Publication Date: 2014-09-24
NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a low carbon-to-nitrogen ratio urban sewage denitrification system and treatment process based on anaerobic ammonium oxidation, and solve the problems existing in the treatment of urban sewage by the traditional nitrification and denitrification biological denitrification process High energy and material consumption in operation, consumption of organic carbon sources, large surplus sludge output, large carbon emissions, low resource utilization, etc.

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  • Anaerobic ammonia oxidation-based low-carbon nitrogen ratio urban sewage denitrification system and treatment process

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Effect test

Embodiment 1

[0033] Embodiment one: a kind of low carbon nitrogen ratio urban sewage denitrification treatment process based on anaerobic ammonium oxidation, comprises the following steps:

[0034] a. After pretreatment (thick and fine grid, grit chamber), the urban sewage enters the aeration tank 1 through the urban sewage inlet pipe 7, and in the aeration tank 1, the return sludge from the sedimentation tank 2 is used to treat the urban sewage Most of the organic matter undergoes biosorption, the treatment time is 20 minutes, and the sludge reflux ratio is 20%; the mud-water mixture discharged from the aeration tank 1 enters the sedimentation tank 2 for mud-water separation, and the treatment time is 1.5 hours; the MLSS of the aeration tank 1 ( Mixed liquor sludge concentration) is 1.5g / L, DO (dissolved oxygen) concentration is 0.2mg / L;

[0035] b. The urban sewage discharged from the sedimentation tank 2 is mixed with the reflux liquid of the nitrosation tank 4 and enters the anammox ta...

Embodiment 2

[0039] Embodiment two: a kind of low carbon nitrogen ratio urban sewage denitrification treatment process based on anaerobic ammonium oxidation, comprises the following steps:

[0040] a. After pretreatment (thick and fine grid, grit chamber), the urban sewage enters the aeration tank 1 through the urban sewage inlet pipe 7, and in the aeration tank 1, the return sludge from the sedimentation tank 2 is used to treat the urban sewage Most of the organic matter undergoes biosorption, the treatment time is 40 minutes, and the sludge reflux ratio is 50%; the mud-water mixture discharged from the aeration tank 1 enters the sedimentation tank 2 for mud-water separation, and the treatment time is 2 hours; the MLSS of the aeration tank 1 ( Mixed liquor sludge concentration) is 2.0g / L, DO (dissolved oxygen) concentration is 0.4mg / L;

[0041] b. The urban sewage discharged from the sedimentation tank 2 is mixed with the reflux liquid of the nitrosation tank 4 and enters the anammox tank...

Embodiment 3

[0045] Embodiment three: a kind of low carbon nitrogen ratio urban sewage denitrification treatment process based on anaerobic ammonium oxidation, comprises the following steps:

[0046] a. After pretreatment (thick and fine grid, grit chamber), the urban sewage enters the aeration tank 1 through the urban sewage inlet pipe 7, and in the aeration tank 1, the return sludge from the sedimentation tank 2 is used to treat the urban sewage Most of the organic matter undergoes biosorption, the treatment time is 30min, and the sludge reflux ratio is 30%; the mud-water mixture discharged from the aeration tank 1 enters the sedimentation tank 2 for mud-water separation, and the treatment time is 2 hours; the MLSS of the aeration tank 1 ( Mixed liquor sludge concentration) is 2g / L, DO (dissolved oxygen) concentration is 0.3mg / L;

[0047] b. The urban sewage discharged from the sedimentation tank 2 is mixed with the reflux liquid of the nitrosation tank 4 and enters the anammox tank 3 to...

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Abstract

The invention provide an anaerobic ammonia oxidation-based low-carbon nitrogen ratio urban sewage denitrification system and treatment process. The system comprises a biological adsorption unit, an anaerobic ammonia oxidation unit, a nitrosation unit, a membrane technology unit and an anaerobic digestion unit, wherein the biological adsorption unit comprises an aeration tank and a settling pond; the aeration tank is connected with the settling pond; the settling pond is connected with an anaerobic ammonia oxidation tank; the anaerobic ammonia oxidation tank is connected with a nitrosation tank provided with a membrane component; the anaerobic digestion unit is an independent sludge treatment unit. The system is short in process flow, short in system startup time, stable and high-efficiency in denitrification performance, standard reach of effluent total nitrogen, low in operating energy consumption and material consumption and low in residual sludge yield. Organic matters in the urban sewage are subjected to biological adsorption removal by utilizing biological adsorption, sludge which is discharged through biological adsorption and is enriched in organic matters is subjected to medium-temperature anaerobic digestion treatment to produce biogas to be used for heating and heat preservation of the medium-temperature anaerobic digestion tank and the low-temperature anaerobic ammonia oxidation tank, the organic matters in the urban sewage can be recycled, and the operating energy consumption of the process is further reduced.

Description

technical field [0001] The invention relates to a low carbon-to-nitrogen ratio urban sewage denitrification system and a treatment process based on anaerobic ammonium oxidation, belonging to the technical field of sewage biological treatment. Background technique [0002] my country's urban sewage influent generally has the water quality characteristics of low carbon-nitrogen ratio. According to statistics, in 2008, the influent BOD of urban sewage treatment plants in my country 5 The average value of / TN is only 3.49, and 60% of urban sewage treatment plants have influent BOD 5 / TN is lower than 4. [0003] For the denitrification treatment of urban sewage with low carbon-to-nitrogen ratio, the traditional biological denitrification process is usually adopted, that is, the nitrification-denitrification process, including nitrification and denitrification reactions. The nitrification reaction is carried out under aerobic conditions through nitrosating bacteria and The role...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/28C02F101/16
CPCY02E50/30
Inventor 郑兴灿杨敏孙永利夏琼琼
Owner NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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