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Method for reducing running energy consumption of membrane bioreactor (MBR)

A membrane bioreactor, a technology of operating energy consumption, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc. The problem of small floc size and other issues can improve the sludge settling performance, reduce the shearing effect of the sludge, and improve the removal efficiency.

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Continuous high-intensity aeration (40-60:1) not only results in higher operating energy consumption, but also has negative effects, such as large aeration volume destroying the floc structure, reducing the floc size and releasing EPS into the bioreactor In the middle, the fine sludge particles in the mixed solution increase, which leads to the clogging of the membrane pores
[0004] Secondly, microporous aeration is usually used in MBR, and the main disadvantage of microporous aeration is that the diaphragm of the aerator has a large resistance, and the core and micropores are easy to block. This is another reason for the high energy consumption of aeration in the MBR process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Test the raw water of a sewage treatment plant, COD 260mg / L, NH 3 -N 27 mg / L. The SRT of the membrane bioreactor is 15 days, the pH value is 6.8, and the temperature is 24 °C. The reactor adopts perforated tube aerator, constant flux operation mode, and the membrane flux is 18 L / (m 2 h), the pump-to-stop ratio of the outlet pump is 10 min:2 min. The normal low-intensity aeration time and ultra-high-intensity aeration time were 10 min and 2 min, respectively, the air-water ratio of normal low-intensity aeration was 30:1, and the air-water ratio of ultra-high-intensity aeration was 60:1. After running for 10 days, the COD removal rate was 97.2%, and the NH 3 The -N removal rate was 96.3%; the sludge concentration was 6.02 g / L, the volume average particle size of the sludge particles was 158 μm, and the LB-EPS content was 2.26 mg / (g VSS); the total filtration resistance was 5.33×10 12 1 / m, the reversible filter resistance is 1.16×10 12 1 / m, the irreversib...

Embodiment 2

[0014] Example 2: Example 1 sewage and operating conditions, where the difference is that the normal low-intensity aeration air-water ratio is 20:1, and the ultra-high-intensity aeration air-water ratio is 70:1. After running for 10 days, the COD removal rate was 97%, and the NH 3 The -N removal rate was 96%; the sludge concentration was 6.36 g / L, the volume average particle size of sludge particles was 162 μm, and the LB-EPS content was 2.28 mg / (g VSS); the total filtration resistance was 5.36×10 12 1 / m, the reversible filter resistance is 1.18×10 12 1 / m, the irreversible filter resistance is 0.93×10 12 1 / m; the average growth rate of TMP is 1.76kPa / d, and the average operating energy consumption is 0.885 kWh / m 3 .

[0015] Comparative example: Example 1 sewage, the treatment conditions are basically the same, the difference is that the membrane microporous aerator is used, the continuous high-intensity aeration method, the aeration gas water ratio is 50:1, and the COD ...

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Abstract

The invention relates to a method for reducing running energy consumption of a membrane bioreactor (MBR), and the method is characterized in that a perforating aerator is adopted when the MBR runs to conduct aeration, wherein the aeration over membrane components is divided into 8-12min long-time low-intensity aeration and 1-2min ultrahigh-intensity aeration; the gas-water ratio of low-intensity aeration is 20-30 to 1; and the gas-water ratio of ultrahigh-intensity aeration is 60-80 to 1. Under the premise that the effluent water quality and the membrane flux are not influenced, the total energy consumption for the aeration is reduced; since a perforating aeration manner is additionally adopted, the aeration resistance is decreased, and thereby the running cost is reduced and the comprehensive running energy consumption can be reduced by about 5 to 8 percent; and in addition, since long-time normal aeration quantity is reduced to some extent, a shearing action over sludge is also lightened, the activity of microorganisms is increased, the sludge settling performance is improved and the pollutant removing efficiency is increased.

Description

technical field [0001] The invention relates to a method for reducing the operating energy consumption of a membrane bioreactor (MBR), in particular to a method of using long low-short high cycle aeration to reduce the total aeration volume and reduce the operating energy consumption of the membrane bioreactor method. Background technique [0002] Although sewage treatment treats pollutants, it is also an energy-consuming process. Energy consumption is one of the main costs of sewage treatment plant operation. The power consumption of my country's sewage treatment plants accounts for about 60-90% of the total operating costs of sewage treatment, and the average power consumption of municipal sewage treatment plants at this stage is 0.3 kWh / m 3 Sewage, and in order to meet the increasingly stringent sewage discharge standards, operating costs are still increasing. MBR is a new sewage treatment process combining membrane separation and biotechnology. It has the characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李秀芬丁祖军张君徐国强王新华王宏堵国成王远飞
Owner JIANGNAN UNIV