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Method for processing low temperature sewerage using low-intensity ultrasonic strengthened membrane bioreactor

A membrane bioreactor and bioreactor technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve poor denitrification effect, high treatment cost and complex process and other problems, to achieve the effect of low consumption and high efficiency denitrification, small footprint and simple process

Inactive Publication Date: 2009-03-04
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of complex process, high treatment cost, high energy consumption, difficulty in reaching standards for ammonia nitrogen and total nitrogen and poor denitrification effect in the existing low-temperature sewage treatment method, the present invention further provides a low-intensity ultrasonic enhanced Membrane bioreactor method for treating low temperature sewage

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  • Method for processing low temperature sewerage using low-intensity ultrasonic strengthened membrane bioreactor
  • Method for processing low temperature sewerage using low-intensity ultrasonic strengthened membrane bioreactor
  • Method for processing low temperature sewerage using low-intensity ultrasonic strengthened membrane bioreactor

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specific Embodiment approach 1

[0011] Specific implementation mode one: as Figure 1~2 As shown, the method of using low-intensity ultrasound to strengthen the membrane bioreactor to treat low-temperature sewage in this embodiment is realized according to the following steps: Step 1, the low-temperature sewage flowing out through the ultra-fine grid flows into the anaerobic membrane bioreactor Pool 1 and aerobic pool 2; step 2, the low-temperature sewage treated in step 1 flows into the membrane pool 3 of the membrane bioreactor, and a (submerged) membrane module 4 with a membrane pore size of 0.1 to 0.2 microns is hoisted in the membrane pool 3 , the packing density of the membrane is 1.5-2.0m2 membrane area / m 3 The amount of treated water, the sludge concentration in the membrane pool is 8000-15000mg / L, and the bottom of the membrane pool 3 is equipped with an aeration device 6 to oxygenate and aerate the low-temperature sewage in the membrane pool 3. Step 3: Use low-intensity ultrasonic waves to aerate t...

specific Embodiment approach 2

[0015] Embodiment 2: The volume ratio of the anaerobic pool 1, the aerobic pool 2, and the membrane pool 3 in this embodiment is 1:5:2. With this setting, the effect of simultaneous removal of organic matter, nitrogen and phosphorus is the best. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific implementation mode three: as Figure 1~2 As shown, in this embodiment, the irradiation time interval is 8 or 12 hours in step three. Other steps are the same as in the first embodiment.

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Abstract

The invention relates to a method for treating low-temperature sewage by using a low-intensity ultrasound-enhanced membrane bioreactor, and belongs to a treatment method of low-temperature municipal sewage. The method can effectively solve the problems in the prior art of complex process, high treatment cost, large energy consumption and poor denitrification effect. The method comprises the following steps: membrane assemblies (4) are suspended in a membrane pond (3), an aeration device (6) is arranged at the bottom of the membrane pond (3) to complete the oxygenation and aeration of the low-temperature sewage inside the membrane pond (3), and the low-temperature sewage inside the membrane pond (3) is exposed to the low-intensity ultrasonic irradiation; the ultrasonic transducers (5) of a low-intensity ultrasound generator is arranged on frames (4-2) on both sides of the membrane assembly (4-1); the purified sewage is sucked under negative pressure by the membrane assemblies and the discharge is controlled by an intelligent control discharge system (7), and the concentrated sludge is returned to an anaerobic pond (1). The invention has the advantages of simple process, high stability, low energy consumption, high efficiency and good denitrification effect.

Description

technical field [0001] The invention relates to a method for treating low-temperature urban sewage. Background technique [0002] In cold regions, the temperature of sewage in autumn and winter is low, and the growth and reproduction of activated sludge are affected by water temperature. Generally speaking, the main problems in the activated sludge treatment of low-temperature sewage are as follows: 1. The microbial activity is weakened, and the removal rate of organic matter in the system is reduced; 2. The sludge concentration is low, and the sludge return must be increased. flow rate, which will increase energy consumption and operating costs; 3. The settling performance of activated sludge is reduced, and sludge bulking is prone to occur, resulting in deterioration of effluent water quality; 4. The ability to remove nitrogen and phosphorus is low. Membrane bioreactors have certain advantages in treating low-temperature urban sewage. Due to the interception effect of th...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/36C02F3/30
Inventor 王秀蘅杜彦武刘娇
Owner HARBIN INST OF TECH
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