Reinforceable denitrification nitrogen removal and phosphorus removal system based on multi-point water feeding and multi-mode operation

A multi-mode operation and multi-point water intake technology, which is applied in the fields of water pollutants, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of carbon source anoxic conditions, high dissolved oxygen concentration, and influence on detoxification. Nitrogen effect and other issues, to achieve the effect of coping with the change of influent water quality, high denitrification efficiency, and improving the removal effect

Pending Publication Date: 2019-06-14
北控水务(中国)投资有限公司
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Problems solved by technology

[0006] In order to ensure the denitrification efficiency, it is necessary to set the mixed liquid internal return system from the end of the aerobic tank to the anoxic tank. Under the traditional anaerobic/anoxic/aerobic (AAO) biochemical process conditions, the

Method used

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  • Reinforceable denitrification nitrogen removal and phosphorus removal system based on multi-point water feeding and multi-mode operation

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Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1: A method based on multi-point water intake and multi-mode operation that can strengthen denitrification, denitrification and phosphorus removal, including the following steps:

[0047] h. Before the pretreated sewage enters the biochemical pool for a certain period of time, the influent water quality is as follows: CODcr: 350mg / L, BOD 5 :150mg / L, TN:65mg / L, NH 3 -N: 50mg / L, TP: 6mg / L. Sewage enters the pre-anoxic tank, stays for 0.5h under stirring conditions, then enters the anaerobic tank, stays for 1.5h under stirring conditions, and the effluent from the anaerobic tank enters the first anoxic tank together with the 200% internal return mixture of the deoxygenation tank , stay for 6 hours under anoxic stirring condition, and carry out denitrification reaction in the first anoxic tank under the action of microorganisms (MLSS is 3.5g / L) to denitrify; wherein 200% refers to the flow rate of the internal reflux mixed liquid and the flow rate of the influen...

Embodiment 2

[0054] Embodiment 2: A method for intensified denitrification, denitrification and phosphorus removal based on multi-point water intake and multi-mode operation, including the following steps:

[0055] f. Before the pretreated sewage enters the biochemical pool for a certain period of time, the quality of the influent water is as follows: COD: 500mg / L, BOD 5 :250mg / L, TN:45mg / L, NH 3 -N: 35mg / L, TP: 6mg / L. Sewage enters the pre-anoxic tank and stays for 0.5h under stirring conditions, then enters the anaerobic tank and stays for 1.5h under stirring conditions.

[0056] g. The proportion of water inflow at each point is as follows: 10% for the pre-anoxic pool, 20% for the anaerobic pool, and 70% for the first anoxic pool.

[0057] h, 200% of the backflow of the second aerobic tank backflow mixed solution enters the first anoxic tank together with the effluent of the anaerobic tank, and stays for 6h under the condition of anoxic stirring, under the action of microorganisms (ML...

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Abstract

The invention relates to a reinforceable denitrification nitrogen removal and phosphorus removal system based on multi-point water feeding and multi-mode operation, and belongs to the technical fieldof sewage treatment. The system comprises a pre-anaerobic pool, an anaerobic pool, a first anaerobic pool, a first oxic pool, a deoxygenation pool, a second anaerobic pool, a second oxic pool, an external carbon source adding system and a mixed liquid inner backflow system, wherein the pre-anaerobic pool, the anaerobic pool, the first anaerobic pool, the first oxic pool, a deoxygenation pool, thesecond anaerobic pool and the second oxic pool are sequentially connected. By aiming at the general phenomena of sewage treatment of high feeding CODcr and feeding TN concentration change, low C-N ratio and high-standard discharge, the deoxygenation pool and the second anaerobic pool are switched between two states of the oxic state and the anaerobic state so as to cope with the feeding quality change; the reasonable allocation and efficient utilization of the carbon source are realized through multi-point water feeding and external carbon source adding point optimization. The system has the advantages that the effluent quality is high; the carbon source utilization rate is high; the flexibility is high; the production operation cost is low, and the like.

Description

technical field [0001] The invention relates to an intensified denitrification denitrification and phosphorus removal system based on multi-point water intake and multi-mode operation, belonging to the technical field of sewage treatment. Background technique [0002] Nitrogen and phosphorus pollution is the main cause of eutrophication in water bodies, and it is also the main problem faced by many polluted water bodies. The carbon-to-nitrogen ratio (C / N) of urban domestic sewage is generally low, and sewage treatment plants generally have the problem of insufficient internal carbon sources in sewage, while the denitrification process requires organic carbon sources as energy sources and electron donors for denitrifying bacteria. If there is insufficient internal carbon source for denitrification, an external carbon source needs to be added to achieve denitrification. Using a multi-point water inlet system and adding external carbon sources to the second anoxic pool can mak...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/10C02F101/16C02F101/38
Inventor 吴云生张宝林刘冰玉王艳张涛石兰兰
Owner 北控水务(中国)投资有限公司
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