Biological sewage-treating process

A technology for biological sewage treatment and water inflow, applied in the field of sewage treatment, can solve the problems of difficult treatment and disposal of chemical sludge, poor biological phosphorus removal effect, insufficient denitrification capacity, etc., and is conducive to aerobic phosphorus absorption and operation Simple and easy to manage and ensure the effect of total nitrogen removal rate

Inactive Publication Date: 2009-02-11
OCEAN UNIV OF CHINA
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Problems solved by technology

[0006] (2) When the concentration of organic matter in the influent is high, the heterotrophic bacteria at the influent end will proliferate too fast, which will also lead to short operation cycles and frequent backwashing
[0007] (3) The effect of biological phosphorus removal is not good, relying on chemical methods to remove phosphorus
As a result, the sludge output is large, and compared with biological sludge, chemical sludge is more difficult to handle and dispose of
[0008] (4) Insufficient denitrification capacity, just oxidizing ammonia nitrogen will not cause the problem of black and odorous water, but it will not help the problem of eutrophication
However, none of the above sequencing batch activated sludge processes can solve a series of contradictions in the requirements of denitrification and phosphorus removal, sludge bulking and other key issues; Key issues such as low nitrogen removal rate and dependence on chemical phosphorus removal

Method used

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  • Biological sewage-treating process

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] The main water quality indicators of raw water are: CODcr=500~800mg / L, BOD 5 =300-400 mg / L, SS=150-450 mg / L, TN=50-90 mg / L, TP=7-11 mg / L. The above raw water is treated by the sewage treatment process of the present invention.

[0038]The sewage treatment device includes a SBR reactor and a BAF reactor, and an intermediate water tank is arranged between the two reactors, and the intermediate water tank is connected to the two reactors through pipelines. First, the electromagnetic valve 16 on the water inlet pipe 1 is opened, and the pretreated raw water enters the SBR reactor 2 through the water inlet pipe 1 . After reaching the predetermined water level, the water inlet electromagnetic valve 16 is closed, and the agitator 3 is opened. After the sewage is mechanically stirred, it is fully mixed with the activated sludge in t...

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Abstract

The biological sewage-treating process includes the first SBR reactor operation stage and the subsequent BAF reactor operation stage. The SBR reactor operation stage to eliminate organic matter and total phosphorous includes the steps of feeding water, reaction, deposition, draining sludge and draining water, and the outgoing water of the SBR reactor is fed to the BAF reactor through one intermediate water tank and pipeline. The BAF reactor operation stage to eliminate total nitrogen includes the steps of denitrifying and nitrifying. The biological sewage-treating process has separate effective elimination of total phosphorous and total nitrogen, effective control of sludge expansion, and capacity of obtaining high and stable outgoing water quality.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a composite process for treating sewage by coupling a sequencing batch activated sludge method and an aerated biological filter tank, specifically a sewage biological treatment method. Background technique [0002] The known sewage biological treatment process can be divided into two categories: suspended sludge treatment process and attached sludge treatment process according to the existing form of microorganisms in the reactor. Due to its structural characteristics, the biological phosphorus removal effect of the attached sludge treatment process is not good. Therefore, after entering the nitrogen and phosphorus nutrient removal stage, the most widely used in actual engineering is the suspended sludge treatment process. [0003] Sequencing batch activated sludge method (sequencing batch reactor, SBR, also translated as intermittent activated sludge method) is a kind of suspende...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 许延营郑西来杨仝锁翟公涛邹英杰
Owner OCEAN UNIV OF CHINA
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