CN116216979A

CN116216979A - Intensive magnetic medium sewage treatment system and technology

Info

Publication number: CN116216979A
Application number: CN202310005930.5A
Authority: CN
Inventors: 何京钟; 孙竟; 柴玉峰; 刘羿; 易洋; 吉青青; 黄文昭
Original assignee: CSCEC Scimee Sci and Tech Co Ltd
Current assignee: CSCEC Scimee Sci and Tech Co Ltd
Priority date: 2023-05-08
Filing date: 2023-05-08
Publication date: 2023-06-06

Abstract

The invention discloses an intensive magnetic medium sewage treatment system and a technology, which belong to the technical field of sewage treatment, wherein the system comprises an MBBR tank, a sludge collecting tank, a coagulation device and a super-magnetic separation device which are sequentially arranged along a sewage treatment path; biological filler is arranged in the MBBR tank; the system also comprises a magnetic recovery device which is respectively connected with the MBBR tank, the coagulation device and the super-magnetic separation device; the magnetic recovery device breaks up and adsorbs the magnetic flocculation discharged by the super-magnetic separation device to obtain magnetic powder and micro-magnetic sludge, the magnetic powder returns to the coagulation device for recycling, one part of the micro-magnetic sludge is discharged, and the other part of the micro-magnetic sludge flows back to the MBBR tank. The process is realized by the system. The system improves the microorganism concentration of the MBBR tank by refluxing the micro-magnetic sludge, realizes the improvement of treatment load, increases the density of the system sludge and the biological film, improves the sludge settling capacity, and ensures that the effluent flocs are settled and removed rapidly.

Description

Intensive magnetic medium sewage treatment system and technology

Technical Field

The invention relates to the technical field of sewage treatment, in particular to an intensive magnetic medium sewage treatment system and technology.

Background

The source control and sewage interception are the most direct and effective measures for treating black and odorous river channels, and are the precondition and foundation for taking other technical measures. For the treatment of interception sewage, the insoluble ammonia nitrogen and COD (chemical oxygen demand) are difficult to deeply remove by adopting a physical method, and the self-cleaning capability requirement of the receiving water body cannot be met. Rain sewage mixed flow sewage in the intercepted sewage, overflow sewage polluted by organic matters, natural water body and the like belong to micro-polluted water bodies, and due to low pollutant concentration, a conventional mud-film symbiotic process is generally adopted, but free activated sludge is difficult to grow and enrich. Meanwhile, the interception sewage reaches higher discharge standard, total phosphorus and Suspended Solids (SS) in the secondary sedimentation tank effluent are required to be deeply treated, a temporary facility is generally required to be established for the micro-polluted water body, the treated water quantity is large, and according to the conventional mud-water separation and deep treatment process, the system occupies large area and the investment and operation cost are high.

The MBBR pure membrane process is a mobile biological membrane filler sewage treatment technology, is based on natural screening of microorganisms, and can realize synchronous removal of low-concentration ammonia nitrogen and total nitrogen when total nitrogen is required to be removed. The super-magnetic separation is a super-high-speed water purification technology based on magnetic flocculation and magnetic separation technology, the time from the reaction to the separation of pollutants is only about 4-6 min, and the time is only 1/10-1/20 of the hydraulic retention time of sand-adding high-speed precipitation, high-density precipitation and the like, so that the super-magnetic separation is advanced water treatment equipment adopting a high-efficiency water-volume physical-chemical method.

Patent CN201921719438.X provides a compact MBBR and super-efficient separation coupling's degree of depth nitrogen and phosphorus removal processing system, including oxygen deficiency pure film MBBR pond, good oxygen pure film MBBR pond, magnetism kind loading pond, flocculation basin and sedimentation tank. The patent adopts a pure film and magnetic precipitation system, but occupies a large area; and because no sludge is returned, microorganisms with a certain concentration are difficult to maintain, the sludge is small in age, and the denitrification capacity is affected, so that the method can only aim at stable low-concentration sewage; when the pollutant in water is slightly increased, the water outlet floccule is increased, the water outlet exceeds standard, and the application range is narrow.

Patent CN 216946646U, "a constrained MBBR sewage treatment device with synchronous nitrification and denitrification", CN 215403359U, "a synchronous nitrification and denitrification method based on MBBR technology," refers to the concept of synchronous nitrification and denitrification by a membrane method, but does not solve the problem of how to realize synchronous nitrification and denitrification.

Patent CN 110803766B, "synchronous nitrification and denitrification process combining a nitrification functional type and a denitrification functional type suspension carrier", optimizes two types of fillers for synchronous nitrification and denitrification, but the carrier forms and the optimization modes are different.

Therefore, an emergency interception sewage treatment with small occupied area and denitrification function is urgently needed, and the synchronous nitrification and denitrification function can be truly realized, and the sewage advanced treatment function is integrated.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an intensive magnetic medium sewage treatment system and a process, which can realize removal of pollutants such as COD, ammonia nitrogen, total phosphorus, SS and the like in sewage, wherein an MBBR tank and a sludge collecting tank of the system replace the anaerobic, anoxic and aerobic tanks of the traditional A2O, a super-magnetic separation device replaces a secondary sedimentation tank and a deep dephosphorization system, and the system is of intensive design and occupies small area; and the microbial concentration of the MBBR tank is improved by refluxing the micro-magnetic sludge, so that the treatment load is improved, the density of the system sludge and the biological film is increased, the sludge settling capacity is improved, and the effluent flocs are quickly settled and removed.

The technical scheme adopted by the invention is as follows:

an intensive magnetic medium sewage treatment system comprises an MBBR tank, a sludge collecting tank, a coagulation device and a super-magnetic separation device which are sequentially arranged along a sewage treatment path; biological filler is arranged in the MBBR tank;

the system also comprises a magnetic recovery device which is respectively connected with the MBBR tank, the coagulation device and the super-magnetic separation device;

the magnetic flocculation discharged by the super-magnetic separation device enters the magnetic recovery device, and after being scattered and separated, magnetic powder and micro-magnetic sludge are obtained, wherein the magnetic powder returns to the coagulation device for recycling, one part of the micro-magnetic sludge is discharged, and the other part of the micro-magnetic sludge flows back to the MBBR tank.

In the intensive magnetic medium sewage treatment system disclosed by the application, the sludge collection tank is also connected with the magnetic recovery device; and after the micro-magnetic sludge flows back to the MBBR tank, collecting the micro-magnetic sludge in the sludge collecting tank, and finally discharging the micro-magnetic sludge into the magnetic recovery device for recovery.

In the intensive magnetic media wastewater treatment system disclosed herein, the MBBR pond has:

the aeration assembly is positioned at the bottom of the MBBR tank;

the fan is connected with the aeration assembly;

the DO detector and the ORP detector are arranged in the MBBR tank;

the fan can control the aeration frequency of the aeration component according to the monitoring data of the DO detector and the ORP detector, and adjust the dissolved oxygen or oxidation-reduction potential in the MBBR tank.

In the intensive magnetic medium sewage treatment system disclosed by the application, a stirring device is further arranged in the MBBR tank.

In the intensive magnetic medium sewage treatment system disclosed by the application, the MBBR tank is further provided with a controller, and the controller is respectively connected with the fan, the stirring device, the DO detector and the ORP detector.

Based on the same inventive concept, the application also provides a sewage treatment process by the sewage treatment system, in particular to an intensive magnetic medium sewage treatment process, which comprises the following steps:

step S1, putting biological filler in an MBBR tank, and forming a biological film process by controlling the concentration of free sludge; the aeration frequency is controlled to adjust the dissolved oxygen and oxidation-reduction potential in the MBBR tank;

s2, sewage enters an MBBR tank for biochemical reaction after conventional pretreatment, and pollutants are removed; then the sludge enters a sludge collecting tank, free sludge and a falling biological film are rapidly settled and removed, settled sludge is removed periodically, and supernatant enters a coagulation device;

s3, reacting the supernatant with the gradually added magnetic powder, PAC and PAM in a coagulation device to form magnetic flocks; the magnetic floccules are salvaged by a magnetic disk in a super-magnetic separation device, separated from a water body, and discharged after the clear water reaches the standard, and enter a magnetic recovery device;

s4, the magnetic floccules are scattered and separated in a magnetic recovery device to obtain magnetic powder and micro-magnetic sludge; the magnetic powder returns to the coagulation device for recycling, one part of the micro-magnetic sludge is discharged, and the other part of the micro-magnetic sludge flows back to the MBBR tank to be used as sludge supplement, and under the action of a micro-magnetic field, the metabolism, growth and adhesion of microorganisms in the MBBR tank are promoted.

In the intensive magnetic medium sewage treatment process disclosed by the application, in the step S1, the adding amount of the biological filler is 10-50%.

In the intensive magnetic medium sewage treatment process disclosed by the application, in the step S1, when only COD, ammonia nitrogen, total phosphorus and SS in sewage are required to be treated, the concentration of dissolved oxygen in the MBBR tank is controlled to be 3-5 mg/L through continuous aeration.

In the intensive magnetic medium sewage treatment process disclosed by the application, in the step S1, when total nitrogen in sewage needs to be removed, stirring an MBBR tank to realize uniform fluidization of the filler in the tank; and through intermittent aeration, the oxidation-reduction potential is controlled to be-100 mV, so that a synchronous nitrification-denitrification mode is realized.

In the intensive magnetic medium sewage treatment process disclosed by the application, in the step S4, after micro-magnetic sludge flows back to the MBBR tank, the micro-magnetic sludge is finally collected in the sludge collecting tank, and after enrichment, the micro-magnetic sludge reenters the magnetic recovery device for magnetic recovery.

Compared with the prior art, the invention has the beneficial effects that:

(1) The intensive design is adopted, so that the occupied area is small; the system comprises a pure membrane MBBR biochemical system and a super-magnetic separation system, and can remove pollutants such as COD, ammonia nitrogen, total phosphorus, SS and the like in sewage, wherein an MBBR tank and a sludge collecting tank of the system replace the anaerobic tank, the anoxic tank and the aerobic tank of the traditional A2O, a super-magnetic separation device replaces a secondary sedimentation tank and a deep phosphorus removal system, and the overall occupied area is reduced by 50% -70%.

(2) The micro-magnetic sludge flows back to the MBBR tank, so that the system processing capacity is improved; the microbial concentration of the MBBR tank is improved through the return flow of the micro-magnetic sludge, so that the treatment load is improved; the density of the sludge and the biological film is increased, the sedimentation capacity of the sludge is improved, and the effluent flocs can be quickly settled and removed; and a large number of microorganisms with electricity in the sewage can induce the enzyme activity and enzyme synthesis of the microorganisms by utilizing the magnetic effect under the action of the micro magnetic field of the micro magnetic sludge, promote the metabolism and growth adhesion of the microorganisms and improve the film forming speed of the microorganisms. Meanwhile, the micromagnetic effect can promote the dissolution of oxygen in water and improve the propagation and metabolism of microorganisms.

(3) The MBBR tank can realize synchronous nitrification and denitrification in the same tank body; the fan of the MBBR tank controls the aeration frequency of the aeration component through the real-time data of the online DO detector and the ORP detector, so as to control the dissolved oxygen and the oxidation-reduction potential to be in a certain range, and can realize synchronous nitrification and denitrification mode operation through automatic adjustment of operation parameters, thereby realizing synchronous removal of total nitrogen.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an intensified magnetic medium sewage treatment system;

FIG. 2 is a schematic flow chart of an intensive magnetic medium sewage treatment process;

FIG. 3 is a schematic diagram of the structure of an MBBR tank.

Reference numerals:

1. an MBBR pool; 11. a biological filler; 12. an aeration assembly; 13. a blower; 14. a DO detector; 15. ORP detector; 16. a stirring device;

2. a mud collecting pool;

3. a coagulation device;

4. a super magnetic separation device;

5. and a magnetic recovery device.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not limiting. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1 and 3, an embodiment of the present application provides an intensive magnetic medium sewage treatment system, which mainly aims to solve the problems that the existing treatment of a slightly polluted water body generally requires to establish temporary facilities, the treated water amount is large, the system occupies a large area according to the conventional mud-water separation and deep treatment process, and the investment and operation cost are high.

The application discloses an intensive magnetic medium sewage treatment system, including MBBR pond 1, collection mud pond 2, coagulation device 3, super magnetic separation device 4 that set gradually along sewage treatment route. The MBBR tank 1 is internally provided with biological filler 11.

The system also comprises a magnetic recovery device 5, wherein the magnetic recovery device 5 is respectively connected with the MBBR tank 1, the coagulation device 3 and the super-magnetic separation device 4.

Wherein, the magnetic flocculation discharged by the super magnetic separation device 4 enters the magnetic recovery device 5, and after scattering and separation, magnetic powder and micro-magnetic sludge are obtained, the magnetic powder returns to the coagulation device 3 for recycling, one part of micro-magnetic sludge is discharged, and the other part of micro-magnetic sludge flows back to the MBBR tank 1.

The system of the application is of intensive design, occupies a small area, comprises a pure membrane MBBR biochemical system and a super-magnetic separation system, can remove pollutants such as COD, ammonia nitrogen, total phosphorus and SS in sewage, and the whole occupied area is reduced by 50% -70% because the MBBR tank 1 and the sludge collecting tank 2 of the system replace the anaerobic, anoxic and aerobic tanks of the traditional A2O, and the super-magnetic separation device 4 replaces the secondary sedimentation tank and the deep dephosphorization system.

The MBBR tank 1 adopts biological filler 11, and realizes the pure film technology MBBR technology by controlling the system food micro ratio and the filler proportion. The biological filler 11 can be magnetic medium biological filler, and the filler is magnetically modified and optimized, so that the film forming performance is improved, the community structure is optimized, and the biological removal capacity is enhanced.

Because the MBBR tank 1 mainly aims at micro-polluted water, the sludge grows slowly, and the amount of the sludge (biological film) is difficult to maintain due to the endogenous respiration, so that the treatment capacity is influenced. According to the method, the micro-magnetic sludge is refluxed, so that the microorganism concentration in the MBBR tank 1 is improved, and the treatment load is improved.

Because the continuously falling biological film in the MBBR tank 1 has small density and light texture, the biological film is easy to flow out along with water, and the effluent SS is increased or the rear end removal pressure is increased. The system has the advantages that through the micro-magnetic sludge backflow, the density of system sludge and biological membranes is increased, the sludge settling capacity is improved, and the effluent flocs can be quickly settled and removed.

Because the sewage contains a large number of microorganisms with electricity, under the action of a micro magnetic field of the reflux micro magnetic sludge, the enzyme activity and enzyme synthesis of the microorganisms can be induced by utilizing the magnetic effect, the metabolism, the growth and the adhesion of the microorganisms are promoted, and the film forming speed of the microorganisms is improved. Meanwhile, the micro-magnetic effect can promote the dissolution of oxygen in water and improve the propagation and metabolism of microorganisms.

In one embodiment, the sludge collecting tank 2 is also connected with the magnetic recovery device 5, and after the micro-magnetic sludge flows back to the MBBR tank 1, the micro-magnetic sludge is collected in the sludge collecting tank 2 and finally recovered by the magnetic recovery device 5, so that the magnetic powder loss rate is further reduced, and the running cost of the magnetic separation system is reduced.

In one embodiment, please refer to fig. 3, the MBBR cell 1 has an aeration assembly 12, a blower 13, a DO (dissolved oxygen) detector 14, and an ORP (oxidation-reduction potential) detector. The aeration component 12 is positioned at the bottom of the MBBR tank 1, and the fan 13 is connected with the aeration component 12. The DO detector 14 and the ORP detector 15 are provided in the MBBR tank 1 for detecting the dissolved oxygen and the oxidation-reduction potential in the tank, respectively.

Wherein, the fan 13 can control the aeration frequency of the aeration component 12 according to the monitoring data of the DO detector 14 and the ORP detector 15, and adjust the dissolved oxygen or oxidation-reduction potential in the MBBR tank 1.

In one embodiment, a stirring device 16 is also arranged in the MBBR pond 1. By the operation of the stirring device 16, the filler in the MBBR tank 1 is uniformly fluidized.

In one embodiment, the MBBR pond 1 is further provided with a controller, the PLC controller being connected to the DO detector 14 and the ORP detector 15, the blower 13, the stirring device 16. The DO detector 14 and the ORP detector 15 transmit the monitored real-time data to the controller, and the controller automatically adjusts the operation parameters of the fan 13 and the stirring device 16 according to the data, so that the synchronous nitrification and denitrification mode operation can be realized, and the synchronous removal of total nitrogen can be realized.

Specifically, when only COD, ammonia nitrogen, total phosphorus and SS in the sewage are required to be treated, the DO detector 14 and the ORP detector 15 respectively detect dissolved oxygen and oxidation-reduction potential in the pool and transmit data to the controller, and the controller adjusts the operation parameters of the fan 13 and the stirring device 16 according to the data, controls the aeration assembly 12 to continuously aerate, controls the dissolved oxygen to be within a certain range and carries out nitrification and decarbonization reaction.

Specifically, when total nitrogen in the sewage needs to be removed, the DO detector 14 and the ORP detector 15 respectively detect dissolved oxygen and oxidation-reduction potential in the pool, data are transmitted to the controller, the controller adjusts operation parameters of the fan 13 and the stirring device 16 according to the data, intermittent aeration of the aeration assembly 12 is controlled, and the oxidation-reduction potential and the dissolved oxygen are controlled in a certain range, so that a synchronous nitrification-denitrification mode is realized.

The MBBR tank 1 can realize synchronous nitrification and denitrification in the same tank body; the fan 13 of the MBBR tank 1 controls the aeration frequency of the aeration component 12 through the real-time data of the online DO detector 14 and the ORP detector 15, so as to control the dissolved oxygen and the oxidation-reduction potential in a certain range, and can realize synchronous nitrification and denitrification mode operation through automatic adjustment of operation parameters, thereby realizing synchronous removal of total nitrogen.

The above-presented embodiments describe in more detail the structure of an intensive magnetic media wastewater treatment system, and the following embodiments will attempt to briefly describe a process for wastewater treatment by the system, i.e., an intensive magnetic media wastewater treatment process.

Referring to fig. 2, the process for treating sewage by using the intensified magnetic medium disclosed in the application comprises the following steps:

In one embodiment, in the step S1, the amount of the bio-filler added is 10 to 50%. Specifically, the addition amount of the biological filler can be 10%, 20%, 30%, 40%, 50% and the like according to the actual water quality requirement.

In one embodiment, in step S1, when only COD, ammonia nitrogen, total phosphorus and SS in the sewage are required to be treated, the concentration of dissolved oxygen in the MBBR tank is controlled to be 3-5 mg/L through continuous aeration. Namely, the method can directly operate in a denitrification-free mode for the scene with control requirements on COD, ammonia nitrogen, total phosphorus, SS and the like.

In another embodiment, in step S1, when the total nitrogen in the sewage needs to be removed, stirring the MBBR tank to realize uniform fluidization of the filler in the tank; and through intermittent aeration, the oxidation-reduction potential is controlled to be-100 mV, so that a synchronous nitrification-denitrification mode is realized. Namely, when the total nitrogen needs to be removed, the MBBR tank can realize synchronous nitrification and denitrification in the same tank body, and realize synchronous removal of the total nitrogen.

In one embodiment, in step S4, after the micro-magnetic sludge flows back to the MBBR pool, the micro-magnetic sludge is finally collected in the sludge collecting pool, and after the micro-magnetic sludge is enriched to a certain extent, the micro-magnetic sludge reenters the magnetic recycling device to perform magnetic recycling, so that the magnetic powder loss rate can be further reduced, and the running cost of the magnetic separation system is reduced.

The intensive magnetic medium sewage treatment process of the application flows micro-magnetic sludge back to the MBBR tank, so that the microorganism concentration of the MBBR tank is improved, the treatment load is improved, the density of system sludge and biological membranes is increased, the sludge settling capacity is improved, and the effluent flocs can be quickly settled and removed. The wastewater contains a large number of microorganisms with electricity, under the action of a micro magnetic field in the reflux micro magnetic sludge, the enzyme activity and enzyme synthesis of the microorganisms can be induced by utilizing the magnetic effect, the metabolism and growth adhesion of the microorganisms are influenced, the film forming speed of the microorganisms is improved, and meanwhile, the micro magnetic effect can promote the dissolution of oxygen in water and improve the propagation and metabolism of the microorganisms. The process realizes synchronous nitrification and denitrification in the same tank body and realizes synchronous removal of total nitrogen by controlling the aeration frequency of the MBBR tank and further controlling the dissolved oxygen and oxidation-reduction potential to be in a certain range.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intensive magnetic medium sewage treatment system is characterized by comprising an MBBR tank, a sludge collecting tank, a coagulation device and a super-magnetic separation device which are sequentially arranged along a sewage treatment path; biological filler is arranged in the MBBR tank;

2. The intensified magnetic media wastewater treatment system of claim 1, wherein the sludge collection basin is further coupled to the magnetic recovery device; and after the micro-magnetic sludge flows back to the MBBR tank, collecting the micro-magnetic sludge in the sludge collecting tank, and finally discharging the micro-magnetic sludge into the magnetic recovery device for recovery.

3. The intensified magnetic media wastewater treatment system of claim 1, wherein the MBBR pond has:

the aeration assembly is positioned at the bottom of the MBBR tank;

the fan is connected with the aeration assembly;

the DO detector and the ORP detector are arranged in the MBBR tank;

4. The intensified magnetic media wastewater treatment system of claim 3, wherein the MBBR tank is further provided with a stirring device.

5. The system of claim 4, wherein the MBBR pond further comprises a controller, the controller being connected to the fan, the stirring device, the DO detector and the ORP detector, respectively.

6. An intensive magnetic medium sewage treatment process is characterized by comprising the following steps of:

7. The intensive magnetic medium sewage treatment process according to claim 6, wherein in the step S1, the amount of the biological filler is 10-50%.

8. The process for treating sewage by using an intensive magnetic medium according to claim 6, wherein in the step S1, when only COD, ammonia nitrogen, total phosphorus and SS in the sewage are treated, the concentration of dissolved oxygen in the MBBR pool is controlled to be 3-5 mg/L by continuous aeration.

9. The process for treating sewage by using an intensive magnetic medium according to claim 6, wherein in the step S1, when total nitrogen in the sewage needs to be removed, stirring is performed on the MBBR tank to uniformly fluidize the filler in the tank; and through intermittent aeration, the oxidation-reduction potential is controlled to be-100 mV, so that a synchronous nitrification-denitrification mode is realized.

10. The process for treating sewage by using an intensive magnetic medium according to claim 6, wherein in the step S4, after the micro-magnetic sludge is returned to the MBBR tank, the micro-magnetic sludge is finally collected in a sludge collecting tank, and after the micro-magnetic sludge is enriched, the micro-magnetic sludge is re-fed into a magnetic recovery device for magnetic recovery.