Method and system for controlling aeration quantity of membrane tank

A technology of aeration volume and membrane control, applied in the field of water treatment, to achieve the effect of reducing the energy consumption of aeration in membrane pools

Active Publication Date: 2013-06-26
BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, within a certain range, increasing the scrubbing aeration rate is very effective in reducing membrane fouling, but when the aeration rate is greater than a certain critical value, increasing the aeration rate has no obvious effect on reducing the thickness of the filter cake layer.

Method used

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  • Method and system for controlling aeration quantity of membrane tank
  • Method and system for controlling aeration quantity of membrane tank
  • Method and system for controlling aeration quantity of membrane tank

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Embodiment 1

[0081] The control strategy was applied to an MBR sewage treatment plant, which adopted A 2 O+MBR treatment process, the treatment scale is 20000m 3 / d.

[0082] The relevant design parameters of the membrane cell are:

[0083] Table 1 Main parameters of the sewage treatment plant of the embodiment

[0084]

[0085] In the MBR process of the sewage treatment plant, the membrane tank adopts the working method of "continuous aeration and intermittent suction". Every 10 minutes of filtration, the air is aerated for 2 minutes. The design parameter of aeration rate is 60m 3 / m 2 / h, the total aeration required is about 700m 3 / min. During normal operation, there are 6 blowers, 4 for use and 2 for standby, and the design flow rate of each blower is 175m 3 / min. The actual rated flow rate of the blower in this plant is 200m 3 / min, during normal operation, the four blowers continuously aerate.

[0086] In this plant, the change of membrane flux and transmembrane pressur...

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Abstract

The invention provides a method for controlling the aeration quantity of a membrane tank. The method comprises the following steps of: calculating the permeability of each water producing period, the permeability each day and the change rate of the current permeability according to the data of membrane flux and transmembrane pressure difference acquired in real time; setting the reference value of the permeability change rate and calculating the ratio of the current permeability change rate to the reference value of the permeability change rate; and determining the ratio of the current permeability change rate to the reference value of the permeability change rate so as to adjust the aeration quantity. The invention also provides a system for implementing the method; and the system comprises a pressure gauge, a flowmeter, an aeration flow control device, a transducer, a blast blower and an aerator pipe, wherein the pressure gauge and the flowmeter are both connected with the aeration flow control device; and the aeration flow control device is orderly connected with the transducer, the blast blower and the aerator pipe. According to the invention, the purpose of reducing the aeration energy consumption of the membrane tank is achieved by regulating and controlling the aeration quantity required by aeration of the membrane tank with the change trend of the permeability of the membrane as a control parameter.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method and system for controlling the aeration rate of a membrane pool. Background technique [0002] MBR sewage treatment technology is the cutting-edge technology in the field of sewage treatment and is gradually replacing the traditional activated sludge method. The MBR technology combines the membrane filtration process with the biochemical treatment process. The ultrafiltration / microfiltration membrane is used to directly filter the effluent from the aerobic pool, which accelerates the degradation of pollutants by microorganisms and doubles the efficiency of sewage treatment. At the same time, because the MBR technology utilizes the separation function of the membrane, it replaces the secondary settling tank and sand filter of the conventional activated sludge process with the membrane separation device, which greatly simplifies the process, saves the land occupati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D7/06C02F3/02
CPCY02W10/10
Inventor 李艳陆茵付宏祥赵雪锋汪诚文
Owner BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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