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Method for decelerating membrane pollution by adding magnetic ferrite powder

A magnetic ferrite and membrane fouling technology, applied in chemical instruments and methods, magnetic field/electric field water/sewage treatment, biological water/sewage treatment, etc., can solve problems such as increasing costs and reducing sewage treatment volume, and achieve improved removal rate effect

Inactive Publication Date: 2009-04-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of increasing cost and reducing sewage treatment capacity in existing membrane bioreactors for controlling membrane fouling, the present invention proposes a method of adding appropriate amount of magnetic ferrite powder into membrane bioreactors to slow down membrane fouling

Method used

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  • Method for decelerating membrane pollution by adding magnetic ferrite powder
  • Method for decelerating membrane pollution by adding magnetic ferrite powder

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Embodiment 1

[0020] Sludge culture is carried out in the bioreactor 3. When the sludge concentration in the bioreactor 3 reaches 2000 mg / L, the magnetic ferrite powder 9 with a magnetization time of 5 min is added to the bioreactor 3, and the magnetic ferrite powder The specific saturation magnetization of 9 is 60emu / g, and the addition amount is 0.3g / L. Continue to cultivate and acclimate. When the sludge concentration in the bioreactor 3 reaches 5000 mg / L, magnetic sludge is formed, and then stable operation starts. Stable operating parameters of membrane bioreactor: Influent is domestic sewage, COD is about 450mg / L, NH 4 + -N is about 30mg / L, pH is about 7.7, temperature is about 25℃; aeration volume is 0.1m 3 / h, the membrane flux is 12.5L / (m 2 ·H); The sludge concentration is maintained at about 5000mg / L through regular sludge discharge; the drainage adopts the gap method, suction for 10 minutes, and stop for 2 minutes. When the bioreactor 3 discharges sludge, the magnetic ferrite powder...

Embodiment 2

[0022] Sludge culture is carried out in the bioreactor 3. When the sludge concentration in the bioreactor 3 reaches 4000mg / L, the magnetic ferrite powder 9 with a magnetization time of 7 min is added to the bioreactor 3, and the magnetic ferrite powder The specific saturation magnetization of 9 is 51emu / g, and the addition amount is 1.0g / L. Continue to cultivate and acclimate. When the sludge concentration in the bioreactor 3 reaches 5200 mg / L, magnetic sludge is formed, and then stable operation starts. Stable operating parameters of membrane bioreactor: Influent is domestic sewage, COD is about 450mg / L, NH 4 + -N is about 30mg / L, pH is about 7.7, temperature is about 25℃; aeration volume is 0.1m 3 / h, the membrane flux is 12.5L / (m 2 ·H); The sludge concentration is maintained at about 5200mg / L through regular sludge discharge; the drainage adopts a gap method, suction for 10 minutes, and stop for 2 minutes. When the bioreactor 3 discharges sludge, the magnetic ferrite powder 9 ...

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Abstract

The invention discloses a method for delaying membrane fouling by adding magnetic ferrite powder and pertains to the technical fields of membrane bioreactors and water treatment. During the cultivation of fouling of membrane bioreactors, the magnetic ferrite powder after being magnetized is added in a bioreactor, cultivation and domestication are continued, the magnetic fouling is formed, then operation is carried out stably. By virtue of the actions such as magnetic catalysis, absorption and the like of magnetic ferrite powder, the membrane fouling in the membrane bioreactor is relieved effectively. When the membrane bioreactor discharges sludge, the magnetic ferrite powder is added according to the amount of the discharged magnetic ferrite powder. The method can relieve membrane fouling effectively and improve the rate that the membrane bioreactor system removes the fouling at the same time; and the ferrite powder is cheap and can be obtained easily, which can be directly obtained from heavy-metal waste water under certain conditions.

Description

Technical field [0001] The invention relates to a method for controlling membrane pollution in a membrane bioreactor, and belongs to the technical field of membrane bioreactor and water treatment. Background technique [0002] Water is one of the most important material conditions for the survival and development of human society. With the economic development and population increase, the discharge of sewage has increased year by year, causing serious pollution of groundwater and surface water, and the contradiction between water supply and demand has become increasingly prominent. Purification and recycling of sewage through various treatment and reuse technologies, so as to realize the recycling of sewage, has become a top priority. In sewage treatment technology, membrane bioreactor is a new type of high-efficiency sewage treatment technology that combines biological treatment process and membrane separation technology, and is one of the hotspot treatment processes for water r...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F1/48
CPCY02W10/10
Inventor 吴春笃赵如金储金宇
Owner JIANGSU UNIV
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