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Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor

A membrane bioreactor, sewage treatment method technology, applied in sustainable biological treatment, aerobic process treatment and other directions, can solve the problems of large area, high excess sludge output, low phosphorus removal efficiency, etc.

Inactive Publication Date: 2008-03-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a composite membrane bioreactor with external circulation of sludge for denitrification and recovery in order to solve the problems of large floor area, high output of excess sludge, high cost of sewage treatment and inability to recover phosphorus in the prior art. Phosphorus sewage treatment method
The invention solves the problem of low phosphorus removal efficiency of the membrane bioreactor, and at the same time recycles the non-renewable resource of phosphorus, and improves the denitrification efficiency of the membrane bioreactor without increasing power consumption

Method used

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  • Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor
  • Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor

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specific Embodiment approach 1

[0005] Specific embodiment one: (referring to Fig. 2, Fig. 3) the technical scheme of this embodiment is realized in this way: in the biofilm zone 1 of the front section of composite membrane bioreactor, suspension type or suspended packing is set, and biofilm is attached On the filler 4, the residence time of the sewage in the biofilm area 1 is 3 to 5 hours, adjust the microporous aerator 5 to control the dissolved oxygen concentration in the biofilm area 1 between 0.5-1.5 mg / L, and carry out synchronous nitrification reaction Nitrification and denitrification; let the effluent from biofilm zone 1 enter sedimentation zone 3 from bottom rectification baffle 7, and the surface load of sedimentation zone 3 is 1.0m 3 / m 2 .h, the sludge-water separation is completed in the sedimentation zone 3, part of the sedimented sludge at the bottom of the sedimentation zone 3 participates in the sludge external circulation for the release and recovery of phosphorus, and the other part of th...

specific Embodiment approach 2

[0006] Specific embodiment 2: In this embodiment, the chemical agents to recover phosphorus are aluminum salts, iron salts, magnesium salts or lime in chemical precipitants and their compound agents in any proportion. Other methods are the same as in the first embodiment.

specific Embodiment approach 3

[0007] Embodiment 3: In this embodiment, lime is used as a chemical precipitant, and the dosage of lime is enough to make the pH value of the sewage reach 10.1-10.6. Other methods are the same as in the first embodiment. The experimental results show that when lime is used as a chemical precipitant, the dosage of lime is related to the alkalinity in the sewage, and has nothing to do with the concentration of phosphorus in the sewage. When lime is added until the pH value of the sewage reaches about 10.4, the phosphorus recovery effect is the best .

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Abstract

The disclosed sewage treatment method to denitrify and recover phosphorus by a sludge external circulating composite membrane bioreactor comprises: attaching the bilmembrane on the filling; keeping the sewage in biormembrane zone for 3~5h; adjusting the micropore aerator to control the COD in biormembrane zone within 0. 5-1. 5mg / L for synchronous nitration and denitrification; letting the output water into the deposition zone with surface load as 1. 0m3 / m2. h through the rectification baffle on bottom; finally, guiding 35~45% deposited sludge in bioreactor into the dephosphorization pond. Compared with prior art, this invention saves 40~60% land, has low residual sludge, reduces cost about 20%, and outputs super water for direct usage.

Description

technical field [0001] The invention relates to a method for urban sewage treatment and resource recovery. Background technique [0002] In recent years, nitrogen and phosphorus pollution of water bodies in my country has been serious. Nitrogen and phosphorus pollution has led to eutrophication of water bodies and the loss of phosphorus, a non-renewable resource, resulting in a "phosphorus crisis." An effective way to solve these problems is to remove the nitrogen in the sewage in the form of nitrogen gas, and recycle the phosphorus. The existing sewage nitrogen and phosphorus removal process (see Figure 1) has the following problems: (1) The process operates in the form of suspended activated sludge, and there is a competition for sludge age between phosphorus accumulating bacteria and nitrifying bacteria , in order to ensure the sewage treatment effect and the sedimentation effect of the secondary sedimentation tank, the biomass in the aeration tank must be controlled wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/02
CPCY02W10/10
Inventor 张立秋袁建磊封莉顾仁政肖峰赵仁遵
Owner HARBIN INST OF TECH
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