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Control method and device for dynamic membrane bioreactor based on surface constant potential control

A bioreactor and control device technology, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., can solve the problem of high energy consumption in aerobic MBR operation, high investment in MBR process, and no biological dynamics. Membrane and other problems, to achieve the effect of reducing dynamic membrane fouling, extending the operating cycle, and shortening the required time

Active Publication Date: 2017-02-22
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, from a technical point of view, the MBR process is quite mature, but its popularization and application is not ideal. There are three main problems: (1) energy consumption. At present, the energy consumption of aerobic MBR is significantly higher than that of conventional activated sludge process.
(2) The commonly used organic or inorganic membranes are expensive, resulting in high investment in the MBR process; (3) Membrane fouling is not easy to control, resulting in a rapid decline in membrane performance
When the initial flux is less than 0.62m / h, no effective biodynamic film is formed on the substrate.

Method used

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  • Control method and device for dynamic membrane bioreactor based on surface constant potential control
  • Control method and device for dynamic membrane bioreactor based on surface constant potential control
  • Control method and device for dynamic membrane bioreactor based on surface constant potential control

Examples

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Effect test

example 1

[0055] Anaerobic DMBR is used to treat cold rolling wastewater. The membrane module is in the form of a flat membrane. The COD concentration in the influent is 1587±256.4mg / L, and the COD concentration in the effluent is 225±20.5mg / L, with an average removal rate of 92.1%. During the operation, the concentration of mixed liquor sludge is 13g / L, the Zeta potential of anaerobic sludge is -60mV, and the dynamic membrane surface potential is controlled to be -100mV. The operating flux is 20L / m 2 h.

example 2

[0057] Aerobic DMBR is used to treat coking sewage, and the membrane module adopts 380 mesh stainless steel wire mesh. Reactor sludge concentration MLSS=4.5g / L, membrane module operating flux 20L / m 2 h, the activated sludge Zeta potential is -10mV during operation. The influent COD concentration is 286.0±71.2mg / L. During the start-up stage of the dynamic membrane bioreactor, a constant potential of +30mV is applied on the membrane surface, and the suspended solids (SS) in the effluent of the reactor will drop below 10mg / L within 20 minutes. The average concentration of COD in the effluent of DMBR in stable operation is 25±5mg / L, and a constant potential of ‐30mV is applied to the membrane surface. In the control group, constant potential control was not applied during the start-up and stabilization phases of the reactor, and the SS dropped below 10 mg / L after 2 hours of effluent from the reactor.

example 3

[0059] The membrane module uses 250-mesh stainless steel wire mesh to construct a DMBR to treat an industrial wastewater. The COD concentration of the influent water is 386±82mg / L, and the ammonia nitrogen concentration is 34±8mg / L. A constant potential of -80 mV was applied to the membrane surface. DMBR sludge concentration MLSS=8g / L, membrane module operating flux 20L / m 2 h. The average concentration of COD in DMBR stable operation water is 20±4.3mg / L, and the concentration of ammonia nitrogen is less than 1.0mg / L.

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Abstract

The invention relates to a dynamic membrane bioreactor regulating and control method and device based on surface constant potential control; the reactor includes an outer shell and a membrane assembly inside the outer shell, wherein the outer shell is provided with a water inlet and water outlets; the regulating and control device includes an online potentiostat, an online flow Zeta potential meter, a programmable logic controller connecting between the online potentiostat and the online flow Zeta potential meter, and a reference electrode arranged in a membrane cavity of a dynamic membrane bioreactor; the Zeta potential meter is used for determining the Zeta potential of a sludge mixed liquid, the potentiostat is used for adjusting the potential, relative to the reference electrode, of the surface of a dynamic membrane, and the Zeta potential meter adjusts a potentiostat selected value by the programmable logic controller. The regulating and control method includes promotion of formation of the dynamic membrane based on the surface constant potential control, regulating and control of pollution of the dynamic membrane based on the surface constant potential control, adopting of cross-flow filtration to allow the dynamic membrane to separate out a penetrant, and electrochemical protection of a dynamic membrane base material. The regulating and control method and device can significantly extend the DMBR operation cycle.

Description

technical field [0001] The invention relates to a sewage treatment device and a sewage treatment method, in particular to a dynamic membrane bioreactor control method and device for sewage treatment. Background technique [0002] Membrane bioreactors (Membrane bioreactors, referred to as MBR) due to the high-efficiency separation performance of the membrane, compared with the traditional activated sludge sewage treatment process that mainly uses gravity sedimentation separation, it has the advantages of small footprint, high volume load, and high effluent water quality. With outstanding advantages, it is considered to be one of the most promising sewage treatment and reuse technologies, and its research and development have attracted worldwide attention. At present, from a technical point of view, the MBR process is quite mature, but its popularization and application is not ideal. There are three main problems: (1) energy consumption. At present, the energy consumption of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李恩超金学文张宜莓任巍施亮张永杰侯红娟尹婷婷裘慕贤
Owner BAOSHAN IRON & STEEL CO LTD