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CN-121974485-A - Edulcoration and mud concentration system suitable for MBR technology

CN121974485ACN 121974485 ACN121974485 ACN 121974485ACN-121974485-A

Abstract

The invention discloses a system for removing impurities and concentrating sludge, which is suitable for an MBR process, and comprises an MBR membrane tank, a driving pump, a sludge concentration tank, a cyclone separator and a water inlet adsorber, wherein an electromagnet is arranged in the water inlet adsorber and is used for removing metal impurities in sludge, the water inlet adsorber is an internal water inlet adsorber or an external water inlet adsorber and is used for realizing primary impurity removal of activated sludge, the activated sludge after impurity removal enters the cyclone separator to perform primary impurity removal concentration, an upper-layer activated sludge mixed solution flows back to the MBR membrane tank, a lower-layer mixture enters the sludge concentration tank to perform secondary impurity removal concentration, a supernatant flows back to the MBR membrane tank, and a lower-layer mixture is discharged. The invention has the characteristics of compact structure, convenient operation, high reliability and the like, integrates the impurity removal and concentration of the activated sludge, and carries out twice concentration on the activated sludge, thereby improving the discharge efficiency of the residual sludge and reducing the water content of the subsequent sludge treatment.

Inventors

  • ZHOU XIONGGANG
  • LI LECHUAN
  • Huang Dingzun
  • ZHOU YUJIAN
  • ZHANG HAO

Assignees

  • 湖南军信环保股份有限公司

Dates

Publication Date
20260505
Application Date
20260326

Claims (10)

  1. 1. The impurity removal and sludge concentration system suitable for the MBR process is characterized by comprising an MBR membrane tank (1), a driving pump (3), a sludge concentration tank (4), a cyclone separator (6) and a water inlet adsorber, wherein an electromagnet (11) is arranged in the water inlet adsorber; The method comprises the steps that a water inlet adsorber is a built-in water inlet adsorber (2), the built-in water inlet adsorber (2) is arranged in an MBR membrane tank (1), a driving pump (3), a sludge concentration tank (4) and a cyclone separator (6) are arranged outside the MBR membrane tank (1), the input end of the driving pump (3) is connected to the built-in water inlet adsorber (2), the output end of the driving pump (3) is connected to the cyclone separator (6), the cyclone separator (6) is nested in the sludge concentration tank (4), the bottom of the cyclone separator (6) is communicated with the sludge concentration tank (4), active sludge in the MBR membrane tank (1) enters the built-in water inlet adsorber (2) for primary impurity removal and then is conveyed to the cyclone separator (6) by the driving pump (3) to achieve primary impurity removal concentration, the obtained upper mixed liquid flows back to the MBR membrane tank (1), the obtained lower mixed liquid enters the sludge concentration tank (4) to achieve secondary impurity removal concentration, the obtained upper mixed liquid flows back to the MBR tank (1), and the obtained upper mixed liquid flows back to the lower layer of the MBR tank (1) to achieve primary impurity removal concentration; Or the water inlet adsorber is an external water inlet adsorber (12), the driving pump (3), the sludge concentration tank (4) and the cyclone separator (6) are arranged outside the MBR membrane tank (1), the input end of the driving pump (3) is connected to the MBR membrane tank (1), the output end of the driving pump (3) is connected to the external water inlet adsorber (12), the external water inlet adsorber (12) is connected to the cyclone separator (6), the cyclone separator (6) is nested in the sludge concentration tank (4), the bottom of the cyclone separator (6) is communicated with the sludge concentration tank (4), activated sludge in the MBR membrane tank (1) is conveyed to the external water inlet adsorber (12) through the driving pump (3) for primary impurity removal, the obtained activated sludge mixed liquor is conveyed to the cyclone separator (6) for primary impurity removal concentration, the obtained upper layer mixed liquor flows back to the MBR membrane tank (1), the obtained lower layer mixture enters the sludge concentration tank (4) for secondary impurity removal, and the obtained upper layer mixture is discharged to the MBR membrane tank (1).
  2. 2. The system for removing impurities and concentrating sludge, which is suitable for MBR process according to claim 1, wherein the built-in water inlet adsorber (2) comprises an inner baffle (22), a supporting frame (24), an outer baffle (25) and a driving component, wherein the electromagnet (11) is arranged on the inner side of the outer baffle (25), the supporting frame (24) is arranged on the top of the outer baffle (25), the driving component is arranged on the supporting frame (24), and the output end of the driving component is connected with the inner baffle (22) for driving the inner baffle (22) to reciprocate on the inner side of the outer baffle (25) so as to open or close a water inlet hole (26) on the side wall of the outer baffle (25).
  3. 3. The system for removing impurities and concentrating sludge, which is suitable for MBR process according to claim 2, characterized in that the bottom of the outer baffle (25) is conical structure, and the bottom of the outer baffle (25) is connected with the driving pump (3) through the water inlet pipe (5).
  4. 4. The system for removing impurities and concentrating sludge, which is suitable for MBR process according to claim 2, characterized in that the driving means is a cylinder (21) or a motor.
  5. 5. The system for removing impurities and concentrating sludge, which is suitable for MBR process according to claim 2, wherein the upper and lower parts of the inner baffle (22) are provided with limit sensors.
  6. 6. The system for removing impurities and concentrating sludge, which is applicable to MBR (membrane bioreactor) process according to claim 1, wherein the external water inlet adsorber (12) comprises a tank body (120), a water outlet pipeline (125), a connecting pipeline (121) with a water inlet valve (122) and an overrunning pipeline (124) with an overrunning valve (123), the side part of the tank body (120) is connected with the output end of the driving pump (3) through the connecting pipeline (121), the top of the tank body (120) is connected with the cyclone separator (6) through the water outlet pipeline (125), a sludge discharge branch pipe (126) with a sludge discharge valve (127) is arranged at the bottom of the tank body (120), an electromagnet (11) is arranged in the tank body (120), the water inlet end of the overrunning pipeline (124) is connected with the connecting pipeline (121) in parallel, the parallel connection part is positioned at the front end of the water inlet valve (122), and the water outlet end of the overrunning pipeline (124) is connected with the water outlet pipeline (125).
  7. 7. The system for removing impurities and concentrating sludge, which is suitable for MBR process according to claim 6, wherein the electromagnet (11), the water inlet valve (122), the overrun valve (123) and the sludge discharge valve (127) are controlled in a linkage manner, when the electromagnet (11) reaches the set adsorption time, the overrun valve (123) is opened automatically, the water inlet valve (122) is closed automatically, the sludge discharge valve (127) on the sludge discharge branch pipe (126) is opened automatically, when the sludge discharge is completed, the sludge discharge valve (127) is closed automatically, the water inlet valve (122) is opened automatically, and the overrun valve (123) is closed automatically.
  8. 8. The system for removing impurities and concentrating sludge, which is suitable for MBR process according to any one of claims 1 to 7, wherein the bottom of the cyclone separator (6) is provided with a sand settling nozzle (61), the middle part of the sand settling nozzle (61) is provided with a dosing port, the dosing port is connected with a dosing pipe (8) to realize that flocculant is added into the sand settling nozzle (61), and the flocculant adding and driving pump (3) are controlled in a linkage way to be simultaneously opened or closed.
  9. 9. The system for removing impurities and concentrating sludge, which is suitable for MBR technology, according to claim 8, is characterized in that a plurality of layers of inclined plates (41) are arranged in the middle and upper parts of the sludge concentrating tank (4) along the vertical direction, the cyclone separator (6) is fixed in the sludge concentrating tank (4) through the inclined plates (41), a water distribution pipe (42) is arranged at the lower part of the sludge concentrating tank (4), the sand settling nozzle (61) is connected with the water distribution pipe (42), a sludge discharge pipe (10) is arranged at the bottom of the sludge concentrating tank (4), a clear liquid pipe (9) is arranged at the side part of the sludge concentrating tank (4), and the clear liquid pipe (9) is positioned above the inclined plates (41).
  10. 10. The system for removing impurities and concentrating sludge, which is suitable for MBR process according to claim 8, wherein the inflow velocity of the cyclone separator (6) is controlled to be 5 m/s-12 m/s.

Description

Edulcoration and mud concentration system suitable for MBR technology Technical Field The invention relates to the technical field of sewage treatment, in particular to a system for removing impurities and concentrating sludge, which is suitable for an MBR (membrane bioreactor) process. Background The MBR (Membrane Bio-Reactor) process is an advanced sewage treatment technology that efficiently combines a Membrane separation technology with a conventional biological treatment technology (activated sludge process). The membrane component is utilized to replace a secondary sedimentation tank in the traditional activated sludge process, so that high-efficiency solid-liquid separation is realized. The MBR process is mainly divided into biodegradation and membrane separation. Biodegradation means that organic pollutants in sewage are decomposed and oxidized into carbon dioxide, water and other harmless substances by microbial communities (mainly bacteria) in activated sludge in a bioreactor. Meanwhile, specific bacteria such as nitrifying bacteria can convert pollutants such as ammonia nitrogen. Membrane separation refers to the process that the mixed liquor (water and activated sludge) after biochemical treatment passes through a membrane component with a specific aperture under the drive of pressure (pump suction or liquid level difference). The MBR membrane is like a precise sieve, can effectively intercept almost all suspended matters, colloid, activated sludge flora and macromolecular organic matters, and only allows clear water molecules to permeate, so that effluent with excellent water quality is obtained. The sludge adopts a plate-frame dehydration process, which is a common mode for improving the solid content of the sludge, but a plate-frame machine inevitably breaks cloth in daily operation, so that part of impurities in the sludge enter filter pressing liquid, such as the sludge, fibers, scrap iron and the like, enter an MBR system, and a large amount of calcium carbonate particles can be generated after entering a biochemical tank if the hardness of the filter pressing liquid is higher. The impurities lead to low MLVSS/MLSS of the activated sludge, and impurities in a biochemical system scratch an ultrafiltration membrane to cause frequent membrane rupture of ultrafiltration, thereby affecting the normal operation of an MBR process. Because the wastewater has high concentration of pollutant in water and long SRT (sludge retention time), the sludge is discharged by adopting dehydration equipment, the impurity removal efficiency is very low, and the daily impurity brought by the daily sludge discharge is also lower because the daily water inflow is larger than the sludge discharge. In the MBR process, the existing sludge concentration and dehydration devices such as centrifugal dehydrators, spiral shell stacking machines and flocculation precipitation extrusion systems have the following defects: (1) In the MBR system, the concentration of the pollutant of the inlet water is high, the residence time of the sludge is long, the efficiency of removing impurities such as scrap iron, fine sand, fiber and the like by discharging the sludge through a dehydration device is low, and the impurities are difficult to effectively remove. (2) Traditional external MBR membrane's filter equipment like filter screen, self-cleaning filter screen etc. can't effectively get rid of impurity such as tiny granule, iron fillings, can't protect the MBR membrane. (3) Traditional built-in MBR membrane is low to impurity removal efficiency, and does not set up the secondary sedimentation tank, and the impurity is accumulated easily. Disclosure of Invention Aiming at the problem that impurities such as scrap iron, tiny hard particles and the like are easy to scratch an ultrafiltration membrane in the existing MBR process, the invention provides the impurity removal and sludge concentration system which is compact in structure, convenient to operate and beneficial to improving the impurity removal quality and is suitable for the MBR process. In order to solve the technical problems, the invention adopts the following technical scheme: the impurity removal and sludge concentration system suitable for the MBR process comprises an MBR membrane tank, a driving pump, a sludge concentration tank, a cyclone separator and a water inlet adsorber, wherein an electromagnet is arranged in the water inlet adsorber; The method comprises the steps that a water inlet absorber is a built-in water inlet absorber, the built-in water inlet absorber is arranged in an MBR membrane tank, a driving pump, a sludge concentration tank and a cyclone separator are all arranged outside the MBR membrane tank, the input end of the driving pump is connected to the built-in water inlet absorber, the output end of the driving pump is connected to the cyclone separator, the cyclone separator is nested in the sludge concentration tank, the bottom of the cyclone sepa