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CN-122010284-A - Operation method and operation device of membrane aeration biological membrane reactor and sewage treatment system

CN122010284ACN 122010284 ACN122010284 ACN 122010284ACN-122010284-A

Abstract

The invention relates to the technical field of sewage treatment, and discloses an operation method and an operation device of a membrane aeration biological membrane reactor and a sewage treatment system. The operation method has at least one regulation and control period during the continuous operation of the reactor, and the period comprises a pre-control step of providing negative pressure pulse to the inside of the membrane assembly, applying normal compressive stress directed to the inside of the membrane wires to the biological membrane attached to the outer surface of the membrane to generate micro strain on the outer layer structure, and a fluidization cutting step of adding and fluidizing circulation cutting particles to the reactor, wherein the particles roll-cut the surface of the biological membrane under the driving of fluid. The outer layer of the biological film is selectively peeled off by the cutting action of the cutting particles and the negative pressure pulse. The invention realizes fine control of the biological film from inside to outside under the condition of not interrupting the sewage treatment process, can maintain the biological film in an ideal mass transfer state with thin density and high activity for a long time, and effectively solves the problem that the mass transfer efficiency is attenuated along with the running time.

Inventors

  • LIU MENGMENG
  • SUN PENGCHAO
  • CHEN YASONG
  • SUN WAN
  • PENG MENGWEN
  • YIN WEI
  • LI LI
  • ZHOU XIAOGUO
  • LIU LONGZHI
  • ZHU HAIPENG

Assignees

  • 三峡环境科技有限公司
  • 中国长江三峡集团有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. A method of operating a membrane-aerated biofilm reactor, characterized in that during continuous operation of the reactor (101), the operating method has at least one regulation cycle comprising: A pre-control step of providing negative pressure pulse inside the membrane component (102) so as to apply normal compressive stress pointing to the inside of membrane wires to the biological membrane (103) attached to the outer surface of the membrane, so that the outer layer structure of the biological membrane (103) generates micro strain; A fluidized cutting step of feeding and fluidizing circulating cutting particles into the reactor (101), the cutting particles rolling-cutting the surface of the biofilm (103) under the drive of a fluid; Wherein the outer layer of the biological film (103) is selectively peeled off by the cooperation of the cutting action of the cutting particles and the negative pressure pulse in time sequence.
  2. 2. The method of claim 1, wherein the negative pressure pulse has a negative pressure intensity of-3 kPa to-20 kPa, a single duration of 1-10 minutes, and an application interval of 1-12 hours.
  3. 3. The method according to claim 1, wherein the cutting particles are inert inorganic particles whose surfaces are hydrophilically modified or charged functional groups are modified, the average particle diameter of the cutting particles is 50 to 300 μm, and the density is 1.1 to 2.0 g/cm 3 .
  4. 4. The method of claim 3, wherein the inert inorganic particulate is at least one of modified zeolite, diatomaceous earth, micro-sized ceramic particles, and activated carbon.
  5. 5. The method of claim 1, wherein the activation of the negative pressure pulse is triggered by at least one of a preset time program, a membrane module (102) air supply pressure exceeding a set threshold, and a water quality parameter deviating from a set range.
  6. 6. An operating device of a membrane-aerated biofilm reactor for carrying out the operating method according to any of claims 1-5, provided with a reactor (101) and a membrane module (102) immersed in the reactor (101), characterized in that the operating device further comprises: a bidirectional gas conveying unit (201) for alternately providing positive pressure gas supply and negative pressure suction for the inside of the membrane component (102), wherein a gas conveying pipeline of the bidirectional gas conveying unit (201) is connected with a gas collecting end of the membrane component (102), The cutting particle feeding and circulating unit is used for feeding, mixing and recycling the cutting particles into the reactor (101), and a feeding port of the cutting particle feeding and circulating unit is communicated with the reactor (101); The control unit (202) is respectively and electrically connected with the bidirectional gas conveying unit (201) and the cutting particle feeding and circulating unit; Wherein the control unit (202) is configured to control the bi-directional gas delivery unit (201) to generate periodic negative pressure pulses and delay 30 seconds to 5 minutes during or after the pulses, and control the cutting particle dosing and circulating unit to adjust the dosing concentration and/or the circulating rate of the cutting particles.
  7. 7. The operating device according to claim 6, characterized in that the bi-directional gas delivery unit (201) comprises: A positive pressure generating device; a negative pressure generating device; And the air inlet of the switching valve is respectively connected with the positive pressure generating device and the negative pressure generating device, the air outlet of the switching valve is connected with the air collecting end of the membrane assembly (102), and the switching valve is used for alternatively conducting the positive pressure air path or the negative pressure air path under the control of the control unit (202).
  8. 8. The operation device according to claim 6, wherein the cutting fine particle feeding and circulating unit comprises: A fine particle storage tank for storing cutting fine particles; the inlet of the feeding pump is connected with the particle storage tank, and the outlet of the feeding pump is connected with the reactor (101); The solid-liquid separation device comprises a solid-liquid separation module and a reflux pump, wherein the inlet side of the solid-liquid separation module is connected with the mixed liquid circulation outlet side of the reactor (101), the inlet end of the reflux pump is connected with the solid outlet of the solid-liquid separation module, and the outlet end of the reflux pump is connected with the particle storage tank.
  9. 9. The operating device according to claim 6, wherein the control unit (202) is further electrically connected to: The pressure sensor is used for monitoring the pressure of gas in the membrane and is arranged at the gas collecting end of the membrane assembly (102); The water quality analyzer is used for monitoring the water quality of the effluent, and is arranged at the water outlet of the reactor (101).
  10. 10. A sewage treatment system comprising the operation device according to any one of claims 6 to 9.

Description

Operation method and operation device of membrane aeration biological membrane reactor and sewage treatment system Technical Field The invention relates to the technical field of sewage treatment, in particular to an operation method and an operation device of a membrane aeration biological membrane reactor and a sewage treatment system. Background The membrane aeration biological membrane reactor (Membrane Aerated Biofilm Reactor, MABR) has great potential in the field of energy conservation and consumption reduction of sewage treatment by virtue of high oxygen mass transfer efficiency and synchronous nitrification and denitrification capability. However, its long-term stable operation faces a technical bottleneck in the operational phase, in which uncontrolled thickening and structural deterioration of the biofilm can lead to a continuous decay in mass transfer efficiency. In long-term operation, continuous metabolism and proliferation of microorganisms lead to continuous thickening of biological films and secretion of Extracellular Polymers (EPS), when the thickness of the biological films exceeds an optimal range, obvious mass transfer resistance gradient is formed inside the biological films, outer microorganisms are aged and deactivated due to nutrition deficiency and accumulated with excessive EPS to form a loose and invalid biomass layer, and the layer does not participate in biochemical reaction but becomes a main barrier for diffusion of substrates to internal active bacteria, so that mass transfer efficiency is rapidly attenuated along with operation time. In order to solve the problem, the prior art mainly adopts a passive intervention mode. For example, by flushing the membrane surface at an elevated circulation flow rate, the hydraulic shear is enhanced, but this approach has limited practical effectiveness and is prone to peeling the active biofilm in its entirety, compromising the stability of the system. The other mode is off-line chemical cleaning, but the sewage treatment process is required to be interrupted, and the acid, alkali or oxidant is used for soaking and cleaning, so that the cost is high, the operation is complex, the residual medicament can cause toxicity to functional microbial communities, and the system recovery period is long. The other mode is a gas back flushing mode, and impact is carried out through instantaneous release of high-pressure gas, so that impact force is unevenly distributed, the effect on a compact inner layer biological film is poor, the energy consumption is high, and film wires can be damaged. The scheme adopted in the prior art is mainly passive and destructive treatment means, and the structure and activity of the biological film cannot be subjected to online, mild and sustainable fine regulation during the normal operation of the system. Disclosure of Invention In view of the above, the present invention provides a method and apparatus for operating a membrane aeration biofilm reactor to solve the above-mentioned problems of the background art. In a first aspect, the present invention provides a method of operating a membrane aerated biofilm reactor, the method of operating having at least one regulation period during continuous operation of the reactor, the regulation period comprising: a pre-control step of providing negative pressure pulse to the inside of the membrane assembly so as to apply normal compressive stress pointing to the inside of the membrane wires to the biological membrane attached to the outer surface of the membrane, so that the outer layer structure of the biological membrane generates microstrain; A fluidization cutting step, namely adding and fluidizing circulating cutting particles into the reactor, wherein the cutting particles roll-cut the surface of the biological film under the driving of fluid; wherein, through the cutting action of the cutting particles and the mutual cooperation of negative pressure pulse in time sequence, the outer invalid biomass of the biological film is selectively stripped, and the inner active biological film is reserved. The method has the advantages that negative pressure pulse is provided for the inside of the membrane component through the pre-control step, normal compression stress pointing to the inside of membrane wires is applied to the biological membrane, the method is different from an outside-in scouring or impacting mode in the prior art, EPS of the biological membrane can be mildly compressed, stagnant water in pores is discharged, micro-strain is generated on an outer aging structure to form a pre-loosening state, meanwhile, the diffusion path of oxygen from the inside of the membrane to the inside of the biological membrane and the diffusion path of a substrate from a main solution to an active flora can be shortened, so that the total resistance of anisotropic mass transfer is effectively reduced, in the fluidization cutting step, the effect of a local flow field is changed by a