Search

CN-122010294-A - Membrane biological reaction system and online cleaning method thereof

CN122010294ACN 122010294 ACN122010294 ACN 122010294ACN-122010294-A

Abstract

The invention relates to the technical field of membrane biological reaction systems, and particularly discloses a membrane biological reaction system and an online cleaning method thereof; according to the invention, the MBR membrane component is not required to be disassembled from the MBR pool for cleaning, the cleaning efficiency is high, the mechanical damage to membrane wires in the disassembling and reassembling processes is effectively avoided, and the cleaning cost is reduced. When radial high-pressure jet water flow is generated through the cleaning spray pipe arranged in the middle of the membrane wire, the hollow fiber membrane wires are controlled to generate twisting action, so that mutual twisting is generated between the hollow fiber membrane wires on the inner layer and the outer layer, further, the sludge is relatively displaced to be peeled off and cracked, the sludge is more effectively flushed clean by combining the radial high-pressure jet water flow in the middle, and each hollow fiber membrane wire is swept through a certain area when being twisted, so that the jet water flow is better and more comprehensive for flushing the hollow fiber membrane wires, and flushing dead angles are greatly reduced.

Inventors

  • LIU LEI
  • GAO YAN
  • ZHAO SHANQI
  • ZHANG TING

Assignees

  • 浙江德安科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. A membrane biological reaction system is characterized by comprising an MBR tank (1), a cleaning pump (2) and a suction pump (3), wherein a plurality of MBR membrane modules (4) distributed in an array are arranged in the MBR tank (1), each MBR membrane module (4) comprises a water outlet pipe (41) with a top wall, a plurality of hollow fiber membrane wires (42), a cleaning spray pipe (43) and a rotary table (44), one end of each hollow fiber membrane wire (42) is in sealing connection with the top wall of the water outlet pipe (41), the other end of each hollow fiber membrane wire is in sealing connection with the rotary table (44), a hollow part of each hollow fiber membrane wire (42) is communicated with an outlet of the water outlet pipe (41), the rotary table (44) is in running fit with the cleaning spray pipe (43), a plurality of hollow fiber membrane wires (42) are distributed around the cleaning spray pipe (43), radially arranged spray holes are uniformly formed in the pipe wall of the cleaning spray pipe (43), the water outlet pipe (41) is communicated with an input port of the suction pump (3), and a hollow fiber membrane wire (2) is communicated with an output port of the cleaning spray pipe (43).
  2. 2. The membrane biological reaction system according to claim 1, wherein the MBR membrane component (4) comprises a driven wheel (45) and a cylindrical rotating shaft (46) which are in rotating fit with the upper end of the cleaning spray pipe (43), the driven wheel (45) is fixedly connected with the cylindrical rotating shaft (46) coaxially, the rotating disc (44) is fixedly connected with the cylindrical rotating shaft (46) coaxially or the rotating disc (44) is in circumferential limiting and axial elastic connection with the cylindrical rotating shaft (46).
  3. 3. The membrane bioreactor system according to claim 2, wherein the turntable (44) is arranged on the lower side of the top wall of the MBR tank (1), the driven wheel (45) is arranged on the upper side of the top wall of the MBR tank (1), and the cylindrical rotating shaft (46) is in rotating fit with the through hole on the top wall of the MBR tank (1).
  4. 4. A membrane bioreactor system according to claim 3, characterized in that the driven wheel (45) is one of a gear or a synchronous pulley, and a driving mechanism for driving the driven wheel (45) is arranged on the top wall of the MBR tank (1).
  5. 5. The membrane bioreactor system according to claim 4, wherein the driven wheel (45) is a synchronous belt wheel, the driving mechanism is a driving motor (5), a driving belt wheel is coaxially arranged on an output shaft of the driving motor (5), and the driving belt wheel is in transmission connection with the driven wheel (45) through a synchronous belt.
  6. 6. The membrane bioreactor system according to claim 5, wherein the lower opening of the cleaning spray pipe (43) is in sealing connection with the top wall of the water outlet pipe (41), and the upper end of the cleaning spray pipe (43) sequentially penetrates through and is in rotary fit with the rotary disc (44), the cylindrical rotary shaft (46) and the driven wheel (45).
  7. 7. The membrane bioreactor system according to claim 5, wherein the length of the hollow fiber membrane filaments (42) is greater than the spacing between the turntable (44) and the top wall of the water outlet pipe (41).
  8. 8. An on-line cleaning method of the membrane bioreactor system as set forth in claim 7, comprising the steps of: 1) firstly, after the water in the MBR tank (1) is discharged, the cleaning pump (2) is started to pump washing water into the cleaning spray pipe (43) through a pipeline so that the cleaning spray pipe (43) generates radial jet water flow; 2) The driven wheel (45) of the MBR membrane assembly (4) is driven by the driving mechanism to rotate in a positive-negative alternating manner, so that the hollow fiber membrane wires (42) surrounding the cleaning spray pipe (43) generate twisting action, and the hollow fiber membrane wires (42) on the inner layer and the outer layer are rubbed with each other, so that the sludge is more effectively washed and falls by the jet water flow.
  9. 9. The on-line cleaning method of a membrane bioreactor system according to claim 8, wherein the hollow fiber membrane filaments (42) are just in a maximum length state when the driven wheel (45) is rotated forward or backward to a maximum angle.
  10. 10. The on-line cleaning method of a membrane bioreactor system according to claim 8, further comprising the step of 3) pumping a certain pressure of washing water into a water outlet pipe (41) through a pipeline to realize back flushing of the hollow fiber membrane filaments (42).

Description

Membrane biological reaction system and online cleaning method thereof Technical Field The invention relates to the technical field of membrane biological reaction systems, in particular to a membrane biological reaction system and an online cleaning method thereof. Background A Membrane biological reaction system (MBR) is novel water treatment equipment combining a Membrane separation technology and biological treatment, and is mainly applied to the fields of municipal sewage, industrial wastewater treatment and reclaimed water recycling. The membrane module replaces the traditional secondary sedimentation tank, and the efficient separation of mud and water is realized by the ultrafiltration/microfiltration technology, so that the treatment efficiency is greatly improved. The membrane component is used as a core component of the MBR system, and the filtering performance of the membrane component directly determines the treatment efficiency and the effluent quality of the whole system. Membrane fouling is an inevitable problem during long-term operation of MBR systems. Impurities such as activated sludge, colloid particles, microorganisms, organic matters, inorganic salts and the like in the sewage can be continuously adsorbed and deposited on the surface of the membrane or block the membrane holes to form a mud cake layer, a biological membrane and scale. If the membrane component is not cleaned in time, the transmembrane pressure difference (TMP) is rapidly increased, the membrane flux is greatly reduced, the energy consumption of the system is further increased, the quality of effluent water is further deteriorated, membrane wires are broken and the membrane component is irreversibly damaged when serious, the service life of the membrane component is greatly shortened, and the running cost and maintenance burden of the system are increased. At present, the cleaning mode for the MBR membrane module is mainly off-line cleaning, wherein the off-line cleaning is to detach the membrane module from an MBR reaction tank, transport the membrane module to a special cleaning area, and clean the membrane module by adopting modes of chemical agent soaking, high-pressure flushing and the like. The cleaning mode has the defects that 1) the process of disassembling, transporting and reloading the membrane module is complex, a great amount of manpower, material resources and time are required to be consumed, the sewage treatment efficiency is reduced, 2) mechanical damage is easily caused to membrane wires in the process of disassembling and reloading, the service life of the membrane module is further shortened, and 3) the offline cleaning requires a matched special cleaning field and equipment, and the cleaning cost is high. 4) Because a large amount of intractable sludge is adhered between the outer wall of the membrane wires of the membrane assembly and the membrane wires, the membrane wires are already adhered into a whole without gaps, and the cleaning effect is greatly reduced by simply relying on water jet. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a membrane biological reaction system and an online cleaning method thereof. The membrane biological reaction system is convenient to clean on line, does not need to disassemble a membrane component, has good cleaning effect, is convenient to operate, and is not easy to cause mechanical damage to membrane wires by combining an on-line cleaning method. The membrane biological reaction system comprises an MBR tank, a cleaning pump and a suction pump, wherein a plurality of MBR membrane assemblies distributed in an array are arranged in the MBR tank, the MBR membrane assemblies comprise a water outlet pipe with a top wall, a plurality of hollow fiber membrane wires, a cleaning spray pipe and a rotary table, one end of each hollow fiber membrane wire is in sealing connection with the top wall of the water outlet pipe, the other end of each hollow fiber membrane wire is in sealing connection with the rotary table, the hollow part of each hollow fiber membrane wire is communicated with an outlet of the water outlet pipe, the rotary table is in running fit with the cleaning spray pipe, the plurality of hollow fiber membrane wires are distributed around the cleaning spray pipe, the pipe wall of the cleaning spray pipe is uniformly provided with radially arranged spray holes, the water outlet pipe is communicated with an input port of the suction pump, and an output port of the cleaning pump is communicated with the upper end of the cleaning spray pipe. The MBR membrane assembly comprises a driven wheel and a cylindrical rotating shaft which are in rotating fit with the upper end of the cleaning spray pipe, wherein the driven wheel is fixedly connected with the cylindrical rotating shaft coaxially, and the rotary table is fixedly connected with the cylindrical rotating shaft coaxially or is in circumferential limiting and a