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Offline cleaning method for removing pollutants of SPG (shirasu porous glass) membrane used in biological wastewater treatment

A biological treatment and membrane fouling technology, applied in the field of sewage treatment, can solve the problems such as the loss of the ability of SPG membrane to generate micro-bubbles, the difficulty of stable operation of the wastewater treatment process, and the surface pollution of SPG membrane.

Inactive Publication Date: 2013-01-09
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0007] Although the application of SPG membrane microbubble aeration technology in wastewater biological treatment can greatly improve the oxygen utilization rate, due to the deposition of inorganic matter, the adsorption of organic matter and the growth of microorganisms, the surface of the SPG membrane will inevitably be polluted, and the surface of the SPG membrane will be polluted by pollutants. Covering makes the micro-bubble generation ability of the SPG membrane lose, and the wastewater treatment process is difficult to operate stably

Method used

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  • Offline cleaning method for removing pollutants of SPG (shirasu porous glass) membrane used in biological wastewater treatment
  • Offline cleaning method for removing pollutants of SPG (shirasu porous glass) membrane used in biological wastewater treatment

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Embodiment 1

[0024] next head combination figure 1 The schematic diagram shown is a detailed description of the specific embodiment of the present invention.

[0025] In the biofilm reactor with fixed soft fiber carrier, SPG membrane microbubble aeration technology is used for microbubble aeration to treat domestic sewage. After the SPG membrane is polluted, ultrasonic treatment is first used for 20 minutes to remove the microbial contamination layer. The ultrasonic frequency is 20kHz , with a power of 1000W, then air-dried naturally at room temperature, heated to 550°C for 2-3 hours to remove organic pollution; then soaked in 0.5mol / L hydrochloric acid for 4 hours to remove inorganic pollution, using this off-line method for cleaning, SPG Membrane fouling is completely removed, microbubble generation ability is basically restored, and long-term stable operation of the overall wastewater treatment system can be realized. Off-line cleaning method of the present invention is to the cleaning...

Embodiment 2

[0027] In the biofilm reactor with suspended spherical carrier, the SPG film micro-bubble aeration technology is used for micro-bubble aeration to treat domestic sewage. After the SPG film is polluted, it is cleaned by the same off-line method as in the example, and the SPG film pollution is completely removed. , the ability to generate microbubbles is basically restored, and the long-term stable operation of the overall wastewater treatment system can be realized. After adopting the off-line method of the present invention to remove SPG membrane fouling, the ability to generate microbubbles and the efficiency of oxygen mass transfer can be fully restored. Taking the dissolved oxygen concentration as the macro index, after membrane fouling, the dissolved oxygen concentration drops from 5mg / L to below 2mg / L, and after the membrane fouling is removed by the off-line cleaning method of the present invention, the dissolved oxygen concentration returns to 4.5-5.0mg / L.

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Abstract

The invention discloses an offline cleaning method for removing pollutant of an SPG (shirasu porous glass) membrane used in biological wastewater treatment. The offline cleaning method includes steps of ultrasonically treating the polluted SPG membrane to remove a microbial polluted layer at first after the SPG membrane is used for treating domestic sewage; air-drying; performing heat treatment to remove organic pollutants; and performing acidic treatment to remove inorganic pollutants. After the pollutants of the SPG membranes are removed by the offline cleaning method, microbubble generating ability, oxygen mass transfer efficiency and dissolved oxygen concentration are comprehensively recovered, so that a smooth wastewater treatment process can be guaranteed.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an off-line cleaning method for removing SPG membrane pollution in wastewater biological treatment. Background technique [0002] Aeration is the basic process of wastewater biological treatment process, and it is also the main link of power consumption, accounting for about 45%-75% of power cost. The existing aeration technologies mainly include bubble aeration and surface aeration, among which the bubble aeration technology is the most widely used, and can be divided into large bubble aeration and small bubble aeration according to the size of the bubbles. The main purpose of aeration is to provide dissolved oxygen for aerobic microorganisms to remove pollutants, and the oxygen mass transfer efficiency of current bubble aeration technology is 15%-40%. Therefore, it is very necessary to apply new aeration technology in wastewater biological treatment to improve the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02C02F3/02
CPCY02W10/10
Inventor 刘春张静张磊杨景亮吴根刘平
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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