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Method for controlling membrane pollution in membrane bioreactor

A technology of membrane bioreactor and bioreactor, which is applied in the fields of chemical instruments and methods, biological water/sewage treatment, sustainable biological treatment, etc., can solve the obstacles to the promotion and application of membrane reactors, the increase of membrane pressure, and the inconvenience of operation and management To achieve the effects of slowing down and controlling membrane fouling, increasing membrane filtration performance, and high effluent quality

Inactive Publication Date: 2010-12-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

During the operation of membrane reactors, membrane fouling is always the biggest obstacle to the popularization and application of membrane reactors.
Membrane fouling leads to an increase in membrane pressure and a decrease in membrane flux, which reduces the processing capacity. At the same time, the cleaning of the membrane also increases the cost, shortens the service life of the membrane, and brings great inconvenience to operation management.

Method used

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  • Method for controlling membrane pollution in membrane bioreactor
  • Method for controlling membrane pollution in membrane bioreactor
  • Method for controlling membrane pollution in membrane bioreactor

Examples

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Embodiment 1

[0018] Make ferric sulfate into an aqueous solution, then add sodium carbonate (Na 2 CO 3 ) into a polyferric sulfate solution, take 500ml of the sludge mixture in the reactor to a beaker, and carry out a short-term intermittent experiment. Add flocculant during rapid stirring, first stir quickly for 2min (200rpm), then stir slowly for 15min (60rpm) until the coagulation reaction is complete, and determine the optimal dosage is 0.8mM by comparing the specific resistance of sludge.

[0019] Add 1L of the prepared 28mM polyferric sulfate solution into the reactor to treat the mixed liquid solution. The effective volume of the reactor is 35L, so that the concentration of the flocculant in the reactor reaches the optimal dosage of 0.8mM, and the sludge is discharged every day , After the above treatment, the filterability of the mixed liquid membrane is enhanced, and the sludge concentration is reduced, which can achieve the purpose of slowing down and controlling membrane foulin...

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Abstract

The invention belongs to a water and wastewater treating technology, and particularly to a method for controlling the membrane pollution in a membrane bioreactor, which comprises the following steps of: adding a certain concentration of polyferric sulfate as an inorganic flocculating agent, regulating and controlling the property of a sludge mixed liquid in the membrane bioreactor, and then discharging a proper amount of treated sludge mixed liquid to realize the control of the membrane pollution. Particularly for the sludge mixed liquid with fine sludge grains and high EPS (Extracellular Polymeric Substance) concentration after long-term operation, the method can be used for effectively regulating and controlling the sludge performance, alleviating the membrane pollution and prolonging the membrane cleaning period.

Description

technical field [0001] The invention relates to a method for controlling the membrane fouling problem of a membrane bioreactor and regulating the properties of a mixed liquid, which belongs to the technical field of water and waste water treatment. technical background [0002] Membrane bioreactor (MBR) is a high-efficiency wastewater treatment technology that combines biological reaction units with membrane separation technology. It uses microfiltration or ultrafiltration membrane modules for solid-liquid separation, replacing the activated sludge process. The role of the secondary settling tank realizes the complete separation of hydraulic retention time (hydraulic retention time, HRT) and sludge retention time (sludge retention time, SRT), making the operating conditions more flexible. Moreover, the membrane bioreactor device has a compact structure, is easy to realize automatic control, and at the same time greatly saves the occupied area. During the operation of membra...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F3/12C02F1/44
CPCY02W10/10
Inventor 刘俊新欧阳科
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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