CN115367972A - Small-sized integrated MBR sewage treatment equipment and process suitable for inflow fluctuation - Google Patents
Small-sized integrated MBR sewage treatment equipment and process suitable for inflow fluctuation Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
- C02F3/1273—Submerged membrane bioreactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides small-sized integrated MBR sewage treatment equipment and process suitable for inlet water fluctuation, and relates to the technical field of sewage treatment. The invention provides small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation, which comprises a control system, and a grid well, an adjusting tank, a biochemical reaction tank and an MBR membrane tank which are sequentially communicated; the control system controls the start and stop of the sewage treatment equipment according to the liquid level of the regulating tank; the MBR membrane tank is provided with an overflow port which is communicated with the regulating tank or the grid well through a pipeline and is used for refluxing the mixed liquid in the MBR membrane tank to the regulating tank or the grid well so as to ensure that the effluent reaches the standard and is discharged under the condition that the total nitrogen load of the influent water is higher than the designed value; the stable operation of sewage treatment equipment and the standard discharge of effluent under the condition that the water inlet amount is seriously lower than a design value are ensured; the configuration of a nitrifying liquid reflux pump of the aerobic tank, a sludge reflux pump of the membrane tank and an online liquid level control instrument of the membrane tank is cancelled, so that the engineering cost is saved, and the process operation and maintenance difficulty is reduced.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to small-sized integrated MBR sewage treatment equipment and process suitable for inlet water fluctuation.
Background
The process flow of the conventional small MBR integrated sewage treatment equipment is shown in figure 1. The integrated equipment is mainly applied to decentralized rural sewage treatment and treatment of partial industrial wastewater at present. However, the distributed small-sized sewage treatment systems for village and town sewage treatment generally have the problems of large fluctuation of treated water amount and fluctuation of water quality, so that the operation management of the process is difficult, the effluent is difficult to reach the standard, and serious environmental influence is caused.
Secondly, the sewage treatment system with small scale often has the problem that electromechanical equipment is difficult to match, for example, a submersible sewage pump with high flow matching degree can not be selected by an adjusting tank; the biochemical pool can not select the air blower with matched air quantity, and the problems of high energy consumption of system operation and difficult process operation exist generally. The long-term operation also easily causes the faults of a submersible sewage pump and a fan to further influence the stability of the biochemical system. Particularly for a small MBR biochemical treatment system with denitrification requirement, the fluctuation of the inlet water quantity is large; the total nitrogen index fluctuation is large; the problems of difficult control of dissolved oxygen in the biochemical tank and the like lead to the standard exceeding of system effluent indexes, even the breakdown of an activated sludge system of the whole MBR biochemical treatment system, and the application and popularization of the small MBR sewage treatment system are caused by various problems.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
A first object of the present invention is to provide a small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation to solve at least one of the above problems.
The second purpose of the invention is to provide a sewage treatment process.
In a first aspect, the invention provides small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation, which comprises a control system, and a grid well, an adjusting tank, a biochemical reaction tank and an MBR membrane tank which are sequentially communicated;
the control system controls the start and stop of the small-sized integrated MBR sewage treatment equipment according to the liquid level of the regulating tank;
the MBR membrane cisterna sets up the overflow mouth, the overflow mouth communicates with equalizing basin or grid well with the pipeline for the mixed liquid in the MBR membrane cisterna flows back to equalizing basin or grid well through the overflow mouth.
As a further technical scheme, the regulating tank is provided with a low liquid level elevation limit;
when the equalizing basin liquid level is less than the spacing time of low liquid level elevation, control system control the small-size integrated MBR sewage treatment equipment shut down, the equalizing basin is deposited and is held sewage.
As a further technical scheme, the regulating reservoir is provided with a high liquid level elevation limit;
when the equalizing basin liquid level reaches high liquid level elevation spacing, control system control small-size integration MBR sewage treatment equipment start-up operation.
As a further technical scheme, a stirrer and a submersible sewage pump are arranged in the adjusting tank.
As a further technical scheme, a lifting pipeline of the submersible sewage pump is not provided with a flow regulating valve.
As a further technical scheme, the biochemical reaction tank is an aerobic tank, a combination of an anaerobic tank and an anoxic tank or an aerobic tank.
As a further technical scheme, a reflux pump or a reflux pipeline is not arranged in the biochemical reaction tank;
and a sludge reflux pump and a reflux pipeline are not arranged in the MBR membrane tank.
As a further technical scheme, the overflow port is a circular overflow port or a rectangular overflow channel;
preferably, the overflow port is communicated with the regulating reservoir through a pipeline, and the flow rate of the water passing through the pipeline is 0.6-2.0m/s.
As a further technical scheme, the MBR membrane tank is not provided with liquid level elevation limit.
In a second aspect, the invention provides a sewage treatment process, wherein the small-sized integrated MBR sewage treatment equipment is adopted to treat sewage.
Compared with the prior art, the invention has the following beneficial effects:
according to the small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation, the control system controls the start and stop of the small-sized integrated MBR sewage treatment equipment according to the liquid level of the regulating tank, the structure is simple and practical, the installation of an online data feedback instrument is reduced, the automatic control of the system is realized, and the requirements on operation and maintenance personnel are reduced. MBR membrane cisterna sets up the overflow mouth, and the overflow mouth communicates with equalizing basin or grid well with the pipeline for be higher than the muddy water mixed liquid reflux to equalizing basin or grid well of overflow mouth in the MBR membrane cisterna. Because the inlet water of the adjusting tank has a high-quality carbon source, the mixed liquid overflowing from the MBR membrane tank not only brings the activated sludge with the nitrogen and phosphorus removal function into the adjusting tank, but also brings the nitrate nitrogen subjected to aerobic nitrification into the adjusting tank, and then realizes uniform mixing and biochemical reaction of the inlet water, the activated sludge and the carbon source in the adjusting tank. Because the capacity of the regulating tank is large enough, the dissolved oxygen in the overflow mixed liquor can be quickly reduced, favorable conditions are created for biological denitrification and anaerobic biological phosphorus release reaction, and the high-efficiency removal of total nitrogen and the sufficient release of phosphorus are completed.
The method has good guiding significance for improving and reconstructing a conventional small MBR process equipment system with effluent total nitrogen and total phosphorus indexes not reaching the standard. Need not to carry out whole the reform to original equipment by a wide margin, need not newly-increased electromechanical device such as water pump, fan can guarantee the discharge to reach standard of going out water.
Also, based on the principle, when the method is used for the new project engineering design of the small MBR equipment, the adaptability of the system to the water quality and water quantity fluctuation condition can be improved, the matching quantity of electromechanical equipment of the system is reduced, the operation and maintenance difficulty is reduced, the purpose of saving the engineering investment is achieved, and the method has technical popularization value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a conventional integrated AAO-MBR sewage treatment process;
FIG. 2 is a small-sized integrated MBR sewage treatment device suitable for inlet water fluctuation provided in example 1;
FIG. 3 is a small-scale integrated MBR sewage treatment process suitable for inlet water fluctuation provided in example 1;
FIG. 4 is a small-scale integrated MBR sewage treatment process suitable for inlet water fluctuation provided in example 2;
FIG. 5 shows a small-scale integrated MBR sewage treatment process suitable for inlet water fluctuation provided in example 3.
Icon: 1-a grid well; 1-1-a water inlet; 1-2-grating; 2-a regulating reservoir; 2-1-a stirrer; 2-2-submersible sewage pump; 2-3-limiting by a low liquid level elevation; 2-4-high liquid level elevation limit; 3-an anaerobic tank; 4-anoxic pond; 5-an aerobic tank; 5-1-an aeration disc; 5-2-blower; 6-MBR membrane tank; 6-1-MBR membrane module; 6-2-perforated aeration pipes; 6-3-an overflow port; 6-4-water producing pump; 6-5-water producing port; 6-6-sludge external discharge pipe; 6-7-overflow liquid reflux pipeline.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but it will be understood by those skilled in the art that the following embodiments and examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. Those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In a first aspect, the invention provides small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation, which comprises a control system, and a grating well, an adjusting tank, a biochemical reaction tank and an MBR membrane tank which are sequentially communicated, wherein the grating well is used for removing pollutants with larger sizes in sewage; the adjusting tank is used for adjusting the inlet water quantity of sewage, the uniform water quality and the like; the biochemical reaction tank is used for removing total phosphorus, total nitrogen, ammonia nitrogen and BOD in the sewage; and the MBR membrane tank is used for filtering the membrane effluent and intercepting and refluxing the activated sludge.
The control system controls the start and stop of the small-sized integrated MBR sewage treatment equipment according to the liquid level of the regulating tank;
the MBR membrane cisterna sets up the overflow mouth, the overflow mouth communicates with equalizing basin or grid well with the pipeline for the mixed liquid in the MBR membrane cisterna flows back to equalizing basin or grid well through the overflow mouth.
Preferably, the elevation of the MBR membrane tank is higher than the grid well or the adjusting tank, and the mixed liquid higher than the overflow port in the MBR membrane tank flows back to the grid well or the adjusting tank through gravity, so that the energy consumption is saved.
The small-sized integrated MBR sewage treatment equipment provided by the invention provides favorable guarantee for the standard discharge requirement of the produced water when the total nitrogen load of the inlet water is higher than the design value; the stable operation guarantee of the system is provided for the condition that the water inlet quantity is seriously smaller; the problem of poor denitrification and dephosphorization effects caused by small tank capacity of an anaerobic tank and an anoxic tank in the original design is solved; the installation of the on-line data feedback instrument of the membrane pool is reduced, the control of sewage treatment equipment is simplified, and the engineering investment and the requirements on operation and maintenance personnel are reduced.
In some preferred embodiments, the volume of the conditioning tank in which the agitator and submersible sewage pump are installed is required to satisfy a conditioning time of 6 hours or more. The submersible sewage pump is preferably 2-4 times of the designed water quantity.
In some preferred embodiments, the minimum flow rate of the submersible sewage pump needs to satisfy the condition of more than 3-5 times of the average treatment flow rate, and a flow regulating valve is not arranged on a lifting pipeline of the submersible sewage pump.
At present, the specification of a water pump device with high matching degree is generally difficult to select for a small sewage treatment system, the model is usually selected to be larger, and the flow is controlled by a valve on a lifting pipeline, so that the energy consumption is larger, the valve is blocked even after long-term operation, even a submersible sewage pump motor is burnt out, and frequent manual intervention is needed. The regulating tank in the small-sized integrated MBR sewage treatment equipment provided by the invention is matched with a submersible sewage pump water outlet pipeline without installing a regulating valve, the surplus flow of the lift pump is fully utilized, and meanwhile, the configuration of a nitrification liquid reflux pump and a sludge reflux pump in the conventional MBR process is cancelled, the configuration of process equipment is simplified, and the long-term stable operation of the system is ensured.
In some preferred embodiments, the conditioning tank is provided with a low liquid level elevation limit;
when the equalizing basin liquid level is less than the spacing time of low liquid level elevation, control system control small-size integration MBR sewage treatment equipment stop operation, the equalizing basin impounds sewage.
According to the small-sized integrated MBR sewage treatment equipment provided by the invention, the control of the whole equipment is the liquid level control of the regulating tank, when the liquid level of the regulating tank is higher than the low liquid level elevation limit, the submersible sewage pump continuously lifts sewage, the MBR system normally operates, when the liquid level of the regulating tank is lower than the low liquid level elevation limit, the submersible sewage pump stops lifting, and the MBR system stops producing water.
In some preferred embodiments, the conditioning tank is provided with a high level elevation limit;
when the equalizing basin liquid level reaches high liquid level elevation spacing, control system control small-size integration MBR sewage treatment equipment start-up operation.
According to the small-sized integrated MBR sewage treatment equipment provided by the invention, when the liquid level of the regulating tank is lower than the low liquid level elevation limit, the control system stops the submersible sewage pump and the subsequent sewage treatment equipment from running, and after the regulating tank reaches the high liquid level elevation limit, the submersible sewage pump of the regulating tank and the subsequent sewage treatment equipment are started to run, so that the integrated MBR sewage treatment equipment does not need to be controlled and designed independently. Compared with the conventional MBR process, the invention cancels two high and low liquid level elevation limit controls of the MBR membrane tank, reduces the configuration of online instruments, simplifies the control procedure, reduces the number of equipment fault points, reduces the operation and maintenance requirements, and increases the economical efficiency of the engineering.
The high liquid level elevation limit and the low liquid level elevation limit of the regulating tank can be controlled by a liquid level meter.
In some preferred embodiments, the biochemical reaction tank is a combination of an aerobic tank, an anaerobic tank and an anoxic tank, and is used for nitrogen and phosphorus removal of sewage, and may also be selected as a biochemical reaction system of a biofilm process or a biofilm/activated sludge mixing process, if the adjusting tank is enough (HRT > 8 h), the adjusting tank can be set as an anaerobic/anoxic tank, and the biochemical reaction tank is set as an aerobic tank.
In some preferred embodiments, no reflux pump or reflux pipeline is arranged inside the biochemical reaction tank; and a sludge reflux pump and a reflux pipeline are not arranged in the MBR membrane tank.
The small-sized integrated MBR sewage treatment equipment provided by the invention does not need a nitrifying liquid reflux pump device, particularly avoids the problem of difficult control of dissolved oxygen in an aerobic pool in the conventional process when the water inflow is serious and the load of water inflow pollutants is serious and low, simultaneously avoids the microbial death caused by overhigh dissolved oxygen, and ensures the normal living environment condition of the microbial population of the activated sludge.
In some preferred embodiments, the overflow port of the MBR membrane tank is a circular overflow port or a rectangular overflow channel, and can be arranged on the top of the tank wall at the tail end of the MBR membrane tank.
The overflow port of the MBR membrane tank is communicated with the regulating tank through a pipeline, and the flow velocity of the overflow water of the pipeline is 0.6-2.0m/s.
In some preferred embodiments, the MBR membrane tank is not provided with a liquid level elevation limit, the start and stop of the lift pump are controlled according to the liquid level elevation limit of the regulating tank, and the start and stop of the small-sized integrated MBR sewage treatment equipment are controlled in a linkage manner.
In a second aspect, the invention provides a sewage treatment process, wherein the small-sized integrated MBR sewage treatment equipment is adopted to treat sewage.
The sewage treatment process can ensure that the sewage reaches the standard and is discharged when the total nitrogen load of the inlet water is higher than a design value; when the water inflow amount is small, the stable operation of a sewage system can be ensured; the problem of because original design anaerobism pond, oxygen deficiency pond design are slightly littleer to lead to the poor effect of nitrogen and phosphorus removal is solved, and the transformation process need not newly increase the denitrification pond cell body, has practiced thrift structure occupation of land and engineering investment.
The specific processing steps may be, for example, as follows:
s1, treating sewage by a grid well to remove large-size particulate pollutants, then enabling the sewage to enter an adjusting tank, simultaneously enabling mixed liquor overflowing from an MBR membrane tank to synchronously enter the adjusting tank, performing biological denitrification and biological anaerobic/anoxic reaction under the mixing action of a submersible stirrer of the adjusting tank, and then lifting the sewage to a biochemical reaction tank by a submersible sewage pump to further degrade and remove indexes of pollutants such as total nitrogen, total phosphorus, COD (chemical oxygen demand), ammonia nitrogen and the like; the sewage after the microbial treatment enters an MBR membrane tank to realize sludge-water separation, and the effluent is discharged after reaching the standard;
s2, carrying out centralized treatment on pollutants intercepted by the grid well through manual dredging or mechanical deslagging, and carrying out outward transportation at regular intervals;
s3, the excess sludge of the small-sized integrated MBR sewage treatment equipment can be discharged through an overflow mixed liquid system of the MBR membrane tank at regular intervals, so that the metabolic balance of microorganisms in the treatment system is ensured;
s4, discharging the residual sludge in the MBR membrane tank to a sludge concentration tank, and periodically carrying out outward treatment;
s5, refluxing the overflowing mixed liquor of the MBR membrane tank to the water inlet end of the regulating tank through an overflow pipeline, mixing the mixed liquor with inlet water, and performing biological denitrification and biological anaerobic phosphorus release reaction in the regulating tank.
And S6, lifting the mixed liquid subjected to biological denitrification and anaerobic phosphorus release in the regulating tank to a subsequent biochemical treatment system by a lifting pump to continuously complete the reaction processes of biological denitrification, phosphorus removal, nitrification, COD degradation and the like, and finally filtering by an MBR (membrane bioreactor) membrane to reach the standard and discharge.
The invention is further illustrated by the following specific examples and comparative examples, but it should be understood that these examples are for purposes of illustration only and are not to be construed as limiting the invention in any way.
Example 1
A small-size integrated MBR sewage treatment equipment suitable for inlet water fluctuation is shown in figure 2 and comprises a control system, and a grid well 1, an adjusting tank 2, an anaerobic tank 3, an anoxic tank 4, an aerobic tank 5 and an MBR membrane tank 6 which are sequentially communicated. Wherein, a water inlet 1-1 and a grating 1-2 are arranged in the grating well 1; a stirrer 2-1, a submersible sewage pump 2-2, a low liquid level elevation limit 2-3 and a high liquid level elevation limit 2-4 are arranged in the adjusting tank 2; an aeration disc 5-1 is arranged at the bottom of the aerobic tank 5, and the aeration disc 5-1 and a perforated aeration pipe 6-2 at the bottom of the MBR membrane tank 6 are communicated with a fan 5-2 through a pipeline and used for aeration; the MBR membrane pool 6 comprises an MBR membrane assembly 6-1, the wall is provided with an overflow port 6-3, the overflow port 6-3 is communicated with the regulating pool 2 through an overflow liquid return pipeline 6-7, the bottom of the MBR membrane pool 6 is provided with a sludge outer discharge pipe 6-6, the MBR membrane pool 6 is also provided with a water producing port 6-5, and the water reaching the standard is discharged by adopting a water producing pump 6-4.
The process flow diagram is shown in fig. 3, and the specific steps are as follows:
s1, sewage is pretreated by a grid well 1 to remove larger-size granular and fibrous impurities and then enters an adjusting tank 2, the sewage entering the adjusting tank 2 and overflow mixed liquor of an MBR membrane tank 6 are fully stirred and mixed by a stirrer 2-1, denitrification and biological anaerobic reaction are carried out in the adjusting tank 2, and then the sewage is lifted to an anaerobic tank 3, an anoxic tank 4 and an aerobic tank 5 by a submersible sewage pump 2-2 to further carry out degradation and removal of indexes such as total nitrogen, total phosphorus, ammonia nitrogen, COD and the like; the sewage after the microbial treatment enters an MBR membrane tank 6, is filtered by an MBR membrane module 6-1 and then is discharged from a water producing port 6-5 after reaching the standard;
s2, carrying out centralized treatment on pollutants intercepted by the grid well 1 through manual dredging or mechanical deslagging, and carrying out outward transportation at regular intervals;
s3, discharging the excess sludge in the MBR membrane tank 6 through a sludge discharge pipe 6-6 regularly to ensure the growth and metabolism balance of microorganisms in a treatment system;
s4, discharging the residual sludge in the MBR membrane tank 6 to a sludge concentration tank, and carrying out outward treatment at regular intervals;
s5, refluxing the overflow mixed liquor of the MBR membrane tank 6 to the water inlet end of the regulating tank 2 through an overflow liquor reflux pipeline 6-7 to be mixed with inlet water, and then carrying out denitrification and biological phosphorus release reactions in the regulating tank 2.
S6, the mixed liquid subjected to biological denitrification and biological phosphorus release in the regulating tank 2 is lifted to a subsequent biochemical treatment system by a submersible sewage pump 2-2 to continue to complete the reaction processes of biological denitrification, phosphorus removal, nitrification, COD degradation and the like, and is finally filtered by an MBR (membrane bioreactor) membrane component 6-1 to reach the standard and discharged outside.
When the liquid level of the adjusting tank 2 is higher than the low liquid level elevation limit by 2-3, the control system controls the MBR equipment system to start and operate;
when the liquid level of the adjusting tank 2 is lower than the low liquid level elevation limit 2-3, the control system controls the MBR equipment system to stop running, and the adjusting tank 2 stores sewage.
After the equipment stops running, when the liquid level of the adjusting tank 2 reaches the high liquid level elevation limit 2-4, the control system controls the MBR equipment system to start running.
Test example 1
Taking a certain dispersive agricultural sewage integrated treatment device as an example, the designed treatment capacity is 150m 3 (d) inflow water CODcr is less than 350mg/L, NH 3 And (3) the-N is less than 30mg/L, the TN is less than 35mg/L, the TP is less than 5mg/L, the effluent quality standard is first-grade A, an AAO-MBR treatment process is adopted, as shown in figure 1, the sludge reflux from the membrane tank to the aerobic tank is 300%, the nitrified liquid reflux from the aerobic tank to the denitrification tank is 200%, and the HRT design time is 10h. The actual water inflow is less than 100m 3 The CODcr of the inlet water is 50-900 mg/L, the TN is 40-70 mg/L, the fluctuation of the quantity and the quality of the inlet water is large in the initial debugging and running process, the dissolved oxygen quantity brought by the return liquid of the MBR membrane tank is large, the DO value of the dissolved oxygen in the aerobic tank often exceeds more than 8mg/L (the standard value is 2-4 mg/L), the nitrification/denitrification strains of the system are difficult to survive, and the NH of the outlet water 3 The indexes of-N and TN exceed standards and cannot reach the emission standard.
According to the technical route of the invention, the MBR equipment system is transformed into the integrated MBR sewage treatment equipment in the embodiment 1 of the invention, the process flow is shown in FIG. 3, and the process comprises the steps of arranging an overflow pipe at an MBR membrane tank to the water inlet end of an adjusting tank, and simultaneously ensuring that the lifting water quantity of the adjusting tank reaches 5 times of the average running flow. Then passes throughAfter the operation of one week, the effluent effect reaches CODcr = 15-25 mg/L, NH 3 N = 0-2.5 mg/L, TN = 5-12 mg/L, TP = 0.2-0.5 mg/L, and finally the emission reaching the standard is realized.
Example 2
A small-sized integrated MBR sewage treatment device and process suitable for inlet water fluctuation are shown in FIG. 4 and comprise a control system, and a grating well, an adjusting tank, an aerobic tank and an MBR membrane tank which are sequentially communicated, wherein a coarse grating is arranged in the grating well; a high liquid level elevation limit and a low liquid level elevation limit are arranged in the regulating tank, and a submersible stirrer and a lift pump are arranged at the bottom of the regulating tank; the bottom of the aerobic tank is provided with an aeration disc which is connected with an air supply pipe and used for supplying oxygen; the MBR membrane tank is provided with an overflow port and is connected with a grid well pipeline.
The sewage treatment process comprises the following steps:
the sewage is pretreated by a grid well to remove pollutants with larger sizes, then the sewage enters an adjusting tank to be subjected to anaerobic/anoxic treatment, the stay time of the adjusting tank is 8 hours, the treated sewage flows to a filtering area through a lifting pump (lifting water amount is 100% -400%) through a water inlet pipe to remove pollutants with smaller particle sizes, and the sewage enters an aerobic tank and an MBR membrane tank to be treated, and the produced water is discharged up to the standard.
The elevation of the MBR membrane tank is higher than that of the grid well and the regulating tank, and when the liquid level of the MBR membrane tank is higher than that of the high overflow port, sewage in the MBR membrane tank flows back to the grid well from the overflow port through a return pipe (100-300% of return ratio);
when the liquid level of the regulating tank is higher than the low liquid level elevation limit, the control system controls the equipment to operate;
when the liquid level of the regulating reservoir is lower than the low liquid level elevation limit, the control system controls the equipment to stop running, and the regulating reservoir stores sewage.
After the equipment stops running, when the liquid level of the regulating tank reaches the high liquid level elevation limit, the control system controls the equipment to start running.
Example 3
A small-sized integrated MBR sewage treatment device and process suitable for inlet water fluctuation are disclosed as shown in FIG. 5, and comprise a control system, and a grid well, an adjusting tank, an anoxic tank, an aerobic tank, an MBR membrane tank and ultraviolet disinfection equipment which are sequentially communicated, wherein a coarse grid is arranged in the grid well; a high liquid level elevation limit and a low liquid level elevation limit are arranged in the regulating tank, and a submersible stirrer and a lift pump are arranged at the bottom of the regulating tank; the bottom of the anoxic tank is provided with a stirrer; an aeration disc is arranged at the bottom of the aerobic tank; the MBR membrane tank is provided with a high-level overflow port and is connected with the regulating tank through an overflow pipeline; the overflow pipeline is also communicated with the sludge tank and is used for transferring the sludge to the sludge tank.
The sewage treatment process comprises the following steps:
the sewage is pretreated by a grid well to remove pollutants with larger sizes, then the sewage enters an adjusting tank, the treated sewage is treated by an anoxic tank, an aerobic tank and an MBR membrane tank in sequence and then is discharged after reaching the standard after being treated by ultraviolet disinfection, the residual sludge flow in the MBR membrane tank is discharged to a sludge tank, and the sludge is periodically transported and treated.
The elevation of the MBR membrane tank is higher than that of the regulating tank, and when the liquid level of the MBR membrane tank is higher than that of the overflow port, sewage in the MBR membrane tank flows back to the regulating tank from the overflow port through the return pipe;
when the liquid level of the regulating tank is higher than the low liquid level elevation limit, the control system controls the equipment to operate;
when the liquid level of the regulating reservoir is lower than the low liquid level elevation limit, the control system controls the equipment to stop running, and the regulating reservoir stores sewage.
After the equipment stops running, when the liquid level of the regulating tank reaches the high liquid level elevation limit, the control system controls the equipment to start running.
Test example 2
Because sewage treatment equipment in a certain village does not reach the standard, the village is provided with three sewage treatment stations, and aiming at the problem, stations 1, 2 and 3 are improved on the basis of the original sewage treatment equipment, so that the small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation in embodiment 3 is obtained through improvement, and the equipment is adopted to treat the sewage in the village. After the system normally operates, the station No. 1, station No. 2 and station No. 3 are subjected to water taking detection, and the detection results of the third-party detection mechanism are shown in the table 1 and the table 2.
1. Station No. 2 designed daily throughput of 50m 3 (d) the daily water inflow at low water level is only 10m 3 D; station No. 3 design daily throughput is 20m 3 (d) high water content daysThe water inflow can reach 30m 3 And d. The water volume from all 3 stations has a serious impact on the system. After the water quality is rectified and improved according to the invention, the water quality of the discharged water can still stably reach the standard.
And (3) detection results:
TABLE 1 Water sample test results
| Station | BOD(mg/L) | COD(mg/L) | Ammonia nitrogen (mg/L) | Total phosphorus (mg/L) | Total nitrogen (mg/L) |
| Station No. 1 | 3.8 | 7.8 | 0.47 | 0.18 | 1.6 |
| Station No. 2 | 2.6 | 4.18 | 0.179 | 0.058 | 0.9 |
| Station No. 3 | 3.2 | 5.25 | 0.32 | 0.11 | 1.3 |
| Standard of water outlet | 6 | 30 | 1.5(2.5)* | 0.3 | 5 |
TABLE 2 Water sample test results of third-party companies
| Station | BOD(mg/L) | COD(mg/L) | Ammonia nitrogen (mg/L) | Total phosphorus (mg/L) | Total nitrogen (mg/L) |
| Station No. 1 | 3.6 | 28 | 0.197 | 0.01 | 1.41 |
| Station No. 2 | 2.2 | 17 | 0.152 | 0.03 | 0.9 |
| Station No. 3 | 3.8 | 28 | 0.267 | 0.06 | 2.37 |
| Standard of water outlet | 6 | 30 | 1.5(2.5)* | 0.3 | 5 |
Comparative example 1
A conventional MBR sewage treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank and an MBR membrane tank which are sequentially communicated, wherein a denitrification liquid return pipe (reflux ratio R1=40% -100%) is arranged from the tail end of the anoxic tank to the initial end of the anaerobic tank, a nitrification liquid return pipe (reflux ratio R2=100% -300%) is arranged from the tail end of the aerobic tank to the initial end of the anoxic tank, and a sludge return pipe (reflux ratio R3=200% -400%) is arranged from the MBR membrane tank to the initial end of the aerobic tank; the aerobic tank and the MBR membrane tank are provided with aeration systems.
The process flow is shown in figure 1, sewage is treated by a grid well, a regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank and an MBR membrane tank in sequence and then is discharged after reaching the standard, in the process, sludge at the tail end of the membrane tank flows back, nitrifying liquid at the tail end of the aerobic tank flows back, and denitrifying liquid at the tail end of the anoxic tank flows back.
Compared with the sewage treatment equipment provided by the invention, the comparative example 1 has at least the following disadvantages:
1. the process has more return points, and the return ratio of each sewage return is obviously different;
2. the energy consumption of the process is high. From fig. 1, it can be seen that the energy consumption point of the MBR process is mainly focused on the above three reflux and two aeration (aerobic tank oxygenation aeration, membrane stack scrubbing aeration).
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A small-sized integrated MBR sewage treatment device suitable for inlet water fluctuation is characterized by comprising a control system, and a grid well, an adjusting tank, a biochemical reaction tank and an MBR membrane tank which are sequentially communicated;
the control system controls the start and stop of the small integrated MBR sewage treatment equipment according to the liquid level of the regulating tank;
the MBR membrane cisterna sets up the overflow mouth, the overflow mouth communicates with equalizing basin or grid well with the pipeline for the mixed liquid in the MBR membrane cisterna flows back to equalizing basin or grid well through the overflow mouth.
2. The small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation according to claim 1, wherein the regulating tank is provided with a low liquid level elevation limit;
when the equalizing basin liquid level is less than the spacing time of low liquid level elevation, control system control the small-size integrated MBR sewage treatment equipment shut down, the equalizing basin is deposited and is held sewage.
3. The small-scale integrated MBR sewage treatment plant suitable for influent fluctuation according to claim 2, wherein the adjusting tank is provided with a high liquid level elevation limit;
when the liquid level of the regulating tank reaches the high liquid level elevation limit, the control system controls the small-sized integrated MBR sewage treatment equipment to start and operate.
4. The small-scale integrated MBR sewage treatment plant suitable for influent fluctuation according to claim 1, wherein an agitator and a submersible sewage pump are installed in the adjusting tank.
5. The small scale integrated MBR sewage treatment plant suitable for influent fluctuation according to claim 4, wherein the submersible sewage pump is not provided with a flow regulating valve on its lifting pipe.
6. The small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation as set forth in claim 1, wherein the biochemical reaction tank is an aerobic tank, a combination of an anaerobic tank and an anoxic tank, or an aerobic tank.
7. The small-sized integrated MBR sewage treatment equipment suitable for inlet water fluctuation according to claim 1, wherein no reflux pump or reflux pipeline is arranged inside the biochemical reaction tank;
and a sludge reflux pump and a reflux pipeline are not arranged in the MBR membrane tank.
8. The small-scale integrated MBR sewage treatment equipment suitable for influent fluctuation according to claim 1, wherein the overflow port is a circular overflow port or a rectangular overflow channel;
preferably, the overflow port is communicated with the regulating reservoir through a pipeline, and the flow rate of the water passing through the pipeline is 0.6-2.0m/s.
9. The small-scale integrated MBR sewage treatment equipment suitable for inlet water fluctuation according to claim 1, wherein the MBR membrane tank is not provided with a liquid level elevation limit.
10. A wastewater treatment process, characterized in that the wastewater is treated by the small-scale integrated MBR wastewater treatment equipment suitable for wastewater inlet fluctuation according to any one of claims 1 to 9.
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