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Low-energy consumption aeration-free membrane bioreactor

A technology of bioreactor and aerated membrane, applied in the direction of sustainable biological treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve the problems of short membrane life, achieve fast degradation rate, high processing capacity, and transfer The effect of speed increase

Inactive Publication Date: 2011-04-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a low-energy aeration-free membrane bioreactor, organically combining biofilm technology with membrane filtration technology, wherein Al 2 o 3 The material is made of ceramic membrane tubes, and the biofilm formed by growing microorganisms is attached to the outer wall of the membrane tubes. During the operation, no artificial aeration is required, but the microorganisms are directly in contact with the air, which overcomes the high requirements of traditional membrane bioreactors. The disadvantages of high energy consumption and short membrane life brought by the aeration volume have the functions of biological carbon removal, nitrogen removal and phosphorus removal, which not only improves the oxygen utilization rate of microorganisms, but also greatly reduces the operating cost of the technology

Method used

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  • Low-energy consumption aeration-free membrane bioreactor

Examples

Experimental program
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Embodiment 1

[0033] According to the volume ratio of inoculated sludge: sewage = 5:1, mix the inoculated sludge and sewage into an incubator, and set the membrane tube aperture to 1.5μm, tube length to 1000mm, membrane tube inner diameter × outer diameter Al with 30×32mm and film tube wall thickness 1mm 2 O 3 The two ends of the ceramic membrane tube are blocked and immersed in the inoculated sludge and sewage mixture of the incubator, and allowed to stand for 24 hours without aeration, so that the fixed microorganisms are inoculated to Al 2 O 3 The outer side of the ceramic membrane tube is then aerated for 20 hours. After standing for 2 hours, the supernatant is drained, and the same amount of sewage is added as before, aerated for 20 hours, and the supernatant is drained after standing for 2 hours. A treatment cycle includes three processes of 20 hours of aeration, 2 hours of standing, 2 hours of draining the supernatant and adding the same amount of the same sewage, which takes 24 hours. ...

Embodiment 2

[0036] The composition of the low-energy aeration-free membrane bioreactor in this embodiment is the same as that of Embodiment 1, except that the membrane tube assembly used is composed of 2 sets of ceramic membrane tubes, each containing 4 ceramic membrane tubes.

[0037] The total treated water volume of the low-energy aeration-free membrane bioreactor in this embodiment is 40L / h, and the COD of the purified effluent is less than 35mg / L, NH 3 The content of -N is less than 1mg / L.

Embodiment 3

[0039] The composition of the low-energy aeration-free membrane bioreactor in this embodiment is the same as that of Embodiment 1, except that the membrane tube assembly used is composed of a group of ceramic membrane tubes, each group containing 4 ceramic membrane tubes.

[0040] The total treated water volume of the low-energy aeration-free membrane bioreactor in this embodiment is 20L / h, and the COD of the purified effluent is less than 35mg / L, NH 3 The content of -N is less than 1mg / L.

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Abstract

The invention discloses a low-energy consumption aeration-free membrane bioreactor, relating to the biological treatment of water, waste water or sewage. The bioreactor comprises a low-level water tank, a water circulating pump, a membrane pipe assembly, a high-level water tank, a water level controller, a control valve, a communicating pipe, filtering water tank, a membrane pipe support, a water outlet, a filter screen and a water distributing pipe, wherein the membrane pipe assembly is composed of Al2O3 ceramic membrane pipes, a biological membrane is suspended on the pipe wall at the outer side of each ceramic membrane pipe, the hole diameter of the membrane pipe is 1.5-3.0 mu m, the length of the pipe is 1000 mm, the inner diameter * the outer diameter of the membrane pipe is 30*32 mm, and the thickness of the membrane pipe is 1 mm. The low-energy consumption aeration-free membrane bioreactor does not need artificial aeration in the operating process, but enables microorganisms to be in direct contact with the air, thereby overcoming the defects of high energy consumption and short membrane service life caused by high aeration amount required by the traditional membrane bioreactor, achieving the functions of biological decarbonization, denitrification and dephosphorization, raising the oxygen utilization rate of the microorganisms and greatly lowering the operating cost of the technology.

Description

Technical field [0001] The technical scheme of the present invention relates to the biological treatment of water, wastewater or sewage, specifically a low-energy aeration-free membrane bioreactor. Background technique [0002] The existing membrane bioreactor (abbreviated as MBR) technology is a new sewage treatment process combining activated sludge method and membrane separation technology, and its reactor is mainly composed of a biological treatment reactor and membrane modules. Membrane bioreactor technology has the advantages of small footprint, high removal efficiency and good effluent quality. In recent years, with the development of membrane technology, MBR is more and more widely used in sewage treatment. [0003] The traditional MBR process is to reduce membrane pollution, and a larger aeration volume is often used to strengthen the hydraulic washing on the surface of the membrane module. Although this can slow down the membrane pollution to a certain extent, it also ma...

Claims

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Application Information

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IPC IPC(8): C02F3/10
CPCY02W10/10
Inventor 王志强武强张慧川张跃庭程景萌王振峰
Owner HEBEI UNIV OF TECH