CN111498992A - Low dissolved oxygen biochemical reaction system and process thereof - Google Patents
Low dissolved oxygen biochemical reaction system and process thereof Download PDFInfo
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- CN111498992A CN111498992A CN202010329336.8A CN202010329336A CN111498992A CN 111498992 A CN111498992 A CN 111498992A CN 202010329336 A CN202010329336 A CN 202010329336A CN 111498992 A CN111498992 A CN 111498992A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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Abstract
The invention belongs to the technical field of water treatment, and particularly relates to a low dissolved oxygen biochemical reaction system and a process thereof. A low dissolved oxygen biochemical reaction system comprises two membrane tanks, wherein a membrane component is arranged in each membrane tank, the bottoms of the membrane components are respectively provided with an aeration device, and the aeration devices are used for flushing and aerating the membrane components; the reaction channel with an opening at the top, a partition wall, at least one upper opening and a lower opening guide plate group are further included; the reaction channel is communicated with the membrane pool through the lower opening guide plate group, the partition wall is vertically arranged at the bottom end in the reaction channel, at least one upper opening guide plate group and the lower opening guide plate group are fixedly arranged in the reaction channel at intervals, dissolved oxygen-containing solution generated by membrane scouring aeration is pushed in the reaction channel by taking gas stripping as power, the dissolved oxygen is gradually consumed and reduced in the process that water flows through the reaction channel, the required anoxic condition further realizes synchronous nitrification and denitrification, and the use of a liquid circulating pump is reduced.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a low dissolved oxygen biochemical reaction system and a process thereof.
Background
A Membrane Bioreactor (MBR) is a novel high-efficiency sewage treatment process combining a high-efficiency membrane separation technology and a traditional activated sludge process. Due to the filtering action of the membrane, microorganisms are completely trapped in the MBR membrane bioreactor, so that the hydraulic retention time and the sludge age of the activated sludge are completely separated, and the sludge bulking problem in the traditional activated sludge method is eliminated. The sewage treatment process of the membrane bioreactor has the advantages of high pollutant removal efficiency, strong nitrification capacity, good denitrification effect, stable effluent quality, low residual sludge yield, compact equipment, small occupied area (only 1/3-1/2 of the traditional process), convenient increment and expansion, high automation degree, simple operation and the like. Therefore, the MBR membrane bioreactor sewage treatment process is widely applied to different water quality treatments of various scales.
Compared with the traditional aerobic activated sludge process, the Membrane Bioreactor (MBR) has higher tank capacity efficiency and more guaranteed water production quality. However, MBRs have a plurality of technical problems at present, wherein high energy consumption is a main factor for restricting the extensive application of MBR processes in sewage treatment plants. The aerobic MBR technology needs 'biochemical aeration' to provide oxygen required by aerobic reaction, and also needs 'scouring aeration' to reduce membrane surface pollution, and meanwhile, a 'liquid circulating pump' needs to be used between a biochemical tank and a membrane tank, and the three aspects of energy consumption cause the aerobic MBR technology to consume more energy. In order to improve the competitiveness and wide application of a Membrane Bioreactor (MBR), an effective way for saving energy and reducing consumption must be found.
Disclosure of Invention
Technical problem to be solved
The invention provides a low dissolved oxygen biochemical reaction system and a process thereof, aiming at the technical problems that a sewage treatment system in the existing MBR (membrane bioreactor) sewage treatment process needs biochemical aeration and scouring aeration and a nitrifying liquid reflux system needs a reflux pump and has high energy consumption.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, an embodiment of the present invention provides a low dissolved oxygen biochemical reaction system, including two membrane tanks, each of the membrane tanks having a membrane assembly, the bottom of the membrane assembly having an aeration device, and the two membrane tanks being adjacently disposed, the two membrane tanks adopting an alternate aeration operation mode, the aeration device being configured to perform flushing aeration on the membrane assembly, and further including a reaction channel, a partition wall, at least one upper opening guide plate group, and at least one lower opening guide plate group, which are communicated with the two membrane tanks;
the reaction channel is communicated with the two membrane tanks through one of the lower opening guide plate groups to form a reaction area, and the reaction channel is used for enabling dissolved oxygen-containing solution during aeration of one of the membrane tanks to flow into the reaction channel from one guide plate of the lower opening guide plate groups through the gas stripping action to carry out low dissolved oxygen biochemical reaction;
the partition wall is vertically arranged at the bottom end of the reaction zone, divides the reaction zone into two parts from the middle to form a lengthened flow channel, and is arranged at one side of the reaction channel far away from the two membrane tanks, and a gap is formed between the partition wall and the reaction channel;
at least one upper opening guide plate group and at least one lower opening guide plate group are arranged inside the reaction chamber at intervals and are positioned on two sides of the partition wall, wherein a lower opening is arranged at the bottom of the lower opening guide plate group close to the two membrane ponds, an upper opening is arranged at the top of the upper opening guide plate group adjacent to the lower opening guide plate group, and at least one upper opening guide plate group and at least one lower opening guide plate group are staggered to form an upper opening and a lower opening which provide flow channels for water flow and are used for increasing the length of the flow channels and the hydraulic retention time.
The distance between the lower opening of at least one lower opening guide plate group and the bottom of the reaction chamber is 0.3-0.5 m.
Preferably, the partition wall between the two membrane tanks is an upper opening guide wall, the height of the upper opening guide wall is lower than the height of the periphery of the membrane tank, and the upper opening guide wall is used for enabling the dissolved oxygen-containing solution in aeration of one membrane tank to cross the top of the upper opening guide wall to enter the other membrane tank through air stripping.
Preferably, one upper opening guide plate group is provided, two lower opening guide plate groups are provided, and one upper opening guide plate group is positioned between the two lower opening guide plate groups, so that the reaction channel and the two membrane tanks form a water flow channel required by the biochemical reaction with low dissolved oxygen;
the distance between the lower opening of at least one lower opening guide plate group and the bottom of the reaction chamber is 0.3-0.5 m.
Preferably, the aeration device is communicated with an air inlet pipeline and a blower, one end of the air inlet pipeline is connected with the aeration device, and the other end of the air inlet pipeline is connected with the blower.
Preferably, a sludge discharge pipeline is further arranged on the membrane tank and used for discharging sludge accumulated in the membrane tank for a long time.
Preferably, the upper part of the reaction channel is provided with an overflow pipeline for discharging excessive sewage out of the reaction channel when the water quantity exceeds the designed treatment capacity.
Preferably, the system also comprises a water pump, a valve and a meter.
In a second aspect, embodiments of the present invention provide a low dissolved oxygen biochemical reaction process: the low dissolved oxygen biochemical reaction process is applied to a low dissolved oxygen biochemical reaction system and comprises the following steps:
s1: the membrane component and the aeration device of one membrane pool are started to operate (the membrane component and the aeration device of the other membrane pool are in a closed state), the membrane component connected with the aeration device is aerated and washed by the operating aeration device, and the mixed liquid containing dissolved oxygen in the aeration membrane pool enters the other non-aeration membrane pool through the upper opening flow guide wall between the two membrane pools under the action of air stripping;
s2: after entering the non-aeration membrane pool, the mixed liquid containing dissolved oxygen in the aeration membrane pool enters a reaction channel through a lower opening channel of a lower opening guide plate group close to the end of the non-aeration membrane pool, the mixed liquid containing dissolved oxygen sequentially passes through an upper opening channel of the upper opening guide plate group and a lower opening channel of the lower opening guide plate group which are separated by a partition wall and are on the same side with the non-aeration membrane pool in the reaction channel under the action of the air stripping power, then passes through a 180-degree turning flow channel formed by a gap arranged between the partition wall and one end of the reaction channel far away from the membrane pool, and the mixed liquid containing dissolved oxygen flows through the gap (namely the 180-degree turning flow channel) to enter the other side of the partition wall;
s3: the flow pushing path of the mixed liquid containing dissolved oxygen at the other side of the partition wall is similar to that of one side of the partition wall, the mixed liquid containing dissolved oxygen sequentially passes through the lower opening channel of the lower opening guide plate group and the upper opening channel of the upper opening guide plate group at the same side of the aeration membrane pool, the concentration of the dissolved oxygen is gradually reduced along with the flow pushing of the mixed liquid containing dissolved oxygen in the water flow channel in the reaction channel, and the biochemical reaction of synchronous nitrification and denitrification under the anoxic environment is realized;
s4: mixed liquor from the reaction channel enters the aeration-washed membrane pool through a lower opening channel of a lower opening guide plate group close to the end of the aeration membrane pool;
thus realizing one gas stripping circulation and realizing a plurality of gas stripping circulations according to the operation mode.
S5: when the operation time of the membrane component and the aeration device in the aeration membrane pool reaches the design operation time, closing the membrane component and the aeration device in the aeration membrane pool and stopping operation;
s6: and opening the membrane assemblies and the aeration devices in the non-aeration membrane tanks in the step S1 to start running, wherein the gas stripping plug flow mode of the mixed liquid containing dissolved oxygen in the newly opened aeration membrane tanks is the same as the plug flow mode of the mixed liquid containing dissolved oxygen in the aeration membrane tanks in the steps S1-S4, so that the alternate aeration running of the two membrane tanks is realized.
(III) advantageous effects
The invention has the beneficial effects that:
1. by arranging the two membrane tanks to alternately operate, membrane pollution is reduced and the service life of the membrane is prolonged.
2. Membrane modules are respectively placed in the two membrane tanks, the membrane modules carry out scouring aeration on the membranes through an aeration device, at the moment, dissolved oxygen-containing solution generated by the membrane scouring aeration pushes flow in the reaction channel by taking gas stripping as power, and the dissolved oxygen is gradually consumed and reduced in the process that water flows through the reaction channel, so that required anoxic conditions are formed, and further synchronous nitrification and denitrification are realized.
3. The partition wall and the guide plate group with the upper opening and the lower opening fixed at intervals are arranged in the reaction channel to form a flow channel for liquid plug flow, so that the consumption of dissolved oxygen is gradually reduced in the process that water flow flows through the reaction channel, aerobic conditions required by nitrification reaction and anoxic conditions required by denitrification reaction can be met in the process that the dissolved oxygen is gradually reduced, a low-dissolved-oxygen biochemical reaction system for synchronous nitrification and denitrification is further realized, and the biochemical reaction efficiency is improved.
4. The membrane pool is communicated with the reaction channel through the lower opening guide plate, the nitrified liquid in the membrane pool can directly enter the reaction channel through the flow channel to carry out denitrification and denitrification reactions, and does not need to be pumped into the reaction channel, so that the process is simplified, the use of a pump is reduced, and the energy consumption and the use of equipment are reduced.
Drawings
FIG. 1 is a schematic top view of a low dissolved oxygen biochemical reaction system according to the present invention;
FIG. 2 is a sectional view of the biochemical reaction system with low dissolved oxygen 1-1 according to the present invention;
FIG. 3 is a 2-2 sectional view of a biochemical reaction system with low dissolved oxygen according to the present invention.
[ REFERENCE TO THE FIGURE ] A
10: a membrane module; 20: an aeration device; 30: a reaction channel; 40: a partition wall; (ii) a 50: the upper opening guide plate group; 60: a membrane tank; 601: a first membrane tank; 602: a second membrane tank; 70: a lower opening guide plate group; 80: the upper opening guide wall.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
As shown in fig. 1-3, a biochemical reaction system with low dissolved oxygen comprises two membrane tanks 60, wherein each membrane tank 60 is provided with a membrane module 10, the bottom of each membrane module 10 is provided with an aeration device 20, the aeration device 20 is used for performing scouring aeration on the membrane module 10, the two membrane tanks 60 are arranged adjacently, an intermittent aeration operation mode is adopted between the two membrane tanks 60, and the biochemical reaction system further comprises a reaction channel 30 communicated with the two membrane tanks, a partition wall 40, at least one upper opening guide plate group 50 and at least one lower opening guide plate group 70;
the reaction channel 30 is communicated with two membrane tanks 60 through one of the lower open guide plate groups 70 to form a reaction zone, and the reaction channel 30 is used for enabling the dissolved oxygen-containing solution in the aeration of one of the membrane tanks 60 to flow into the reaction channel 30 from one of the guide plates in the lower open guide plate group 70 through the gas stripping action to carry out the low dissolved oxygen biochemical reaction.
The partition wall 40 is vertically arranged at the bottom end of the reaction zone, divides the reaction zone into two parts from the middle to form a lengthened flow channel, and a 180-degree turning flow channel is formed by a gap arranged between the partition wall 40 and the wall of the reaction channel on one side of the reaction channel 30 far away from the two membrane tanks 60;
at least one upper opening guide plate group 50 and at least one lower opening guide plate group 70 are fixedly installed inside the reaction channel 30 at intervals and are located on two sides of the partition wall 40, wherein a lower opening is formed at the bottom of the lower opening guide plate group 70 close to the two membrane ponds 60, an upper opening is formed at the top of the upper opening guide plate group 50 adjacent to the lower opening guide plate group 70, and an upper opening and a lower opening are alternately formed in the at least one upper opening guide plate group 50 and the at least one lower opening guide plate group 70 to provide flow channels for water flow, so that the length of the flow channels and the hydraulic retention time are increased;
in order to provide a good channel for water flow in the case of air-lift plug flow so as to achieve the optimal state of air-lift plug flow, and to ensure that the system can bidirectionally flush two membrane modules 10 and provide good conditions for biochemical reactions, at least one upper opening guide plate group and at least one lower opening guide plate group on both sides of the partition wall are symmetrically arranged on both sides of the partition wall, the distance between the lower opening of at least one lower opening guide plate group 70 and the bottom of the reaction channel is 0.3m-0.5m, and the size of the interval between the upper opening guide plate group 50 and the lower opening guide plate group 70 is determined according to the size set by the reaction channel 30 and the conditions required by biochemical reactions and the size of aeration of the membrane modules 10.
Specifically, when the membrane module 10 of one membrane tank 60 is aerated, the gas stripping can smoothly enter the membrane module of the other non-aerated membrane tank 60 for flushing through the upper opening guide wall 80, the flushing of the membrane modules 10 in the two membrane tanks 60 is completed through the aeration of the membrane module 10 in one membrane tank 60, the membrane pollution is reduced and the service life of the membrane is prolonged by arranging the two membrane tanks to alternately operate, the partition wall 40 between the two membrane tanks 60 is the upper opening guide wall 80, the height of the upper opening guide wall 80 is lower than the height of the periphery of the membrane tank 60, and the upper opening guide wall 80 is used for turning over the dissolved oxygen-containing solution when one membrane tank 60 is aerated through the gas stripping action to enter the other membrane tank 60 through the top of the upper opening guide wall 80.
Specifically, in order to form a better water flow channel, one upper opening guide plate group 50 and two lower opening guide plate groups 70 are provided, one upper opening guide plate group 50 is positioned between the two lower opening guide plate groups 70, so that the reaction channel 30 and the two membrane pools 60 form a water flow channel required by the biochemical reaction with low dissolved oxygen, that is, when the aeration device 20 in one membrane pool 60 is opened to perform aeration scouring on the corresponding membrane module 10, the solution containing dissolved oxygen in the membrane pool 60 flows more smoothly through the upper opening guide wall 80 in the other non-aerated membrane pool 60 under the action of air-stripping pushing flow generated by scouring aeration, then passes through the lower opening channel of the lower opening guide plate group 501 close to the other non-aerated membrane pool 60, and then sequentially passes through the upper opening channel of the upper opening guide plate group 502 and the lower opening channel of the lower opening guide plate group 501 separated by the partition wall 40 and on the same side as the other non-aerated membrane pool 60, then the solution containing dissolved oxygen enters the other side of the partition wall 40 through a gap (namely a 180-degree turning flow channel) between the partition wall far away from the membrane pool end and the wall of the reaction channel, the flow pushing path of the solution containing dissolved oxygen at the other side of the partition wall 40 is similar to that of the previous flow pushing path at one side of the partition wall 40, the solution sequentially passes through the lower opening channel of the lower opening flow guide plate group 501 and the upper opening channel of the upper opening flow guide plate group 502, and finally enters the aeration membrane pool 60 through the lower opening channel of the lower opening flow guide plate group 501 close to the membrane pool 60 which starts to be aerated, and the whole air stripping flow pushing cycle is completed.
Specifically, air inlet pipelines are further provided for the two aeration devices 20, the aeration devices 20 are communicated with the air inlet pipelines and the air blower, one end of each air inlet pipeline is connected with the aeration device 20, and the other end of each air inlet pipeline is connected with the air blower.
Specifically, a sludge discharge pipeline is further arranged on the membrane tank 60 and used for discharging sludge accumulated in the membrane tank 60 for a long time.
Specifically, an overflow line is provided at an upper portion of the reaction channel 30, and the overflow line defines a water level of the reaction channel 30.
Specifically, the low dissolved oxygen biochemical reaction system further comprises a water pump, a fan, a valve and an instrument, and the water pump, the fan, the valve, the instrument and the membrane module 10 form a membrane sewage treatment system together.
S1: the membrane module 10 and the aeration device 20 of one membrane tank 60 are started to operate (the membrane module 10 and the aeration device 20 of the other membrane tank 60 are in a closed state), at the moment, the membrane module 10 connected with the operating aeration device 20 is subjected to aeration flushing, and the mixed liquid containing dissolved oxygen in the aeration membrane tank 60 enters the other non-aeration membrane tank 60 through the upper opening diversion wall 80 between the two membrane tanks 60 under the action of air stripping;
s2: after entering the non-aeration membrane pool 60, the mixed liquid containing dissolved oxygen in the aeration membrane pool 60 enters the reaction channel 30 through the lower open channel of the lower open guide plate group 70 close to the end of the non-aeration membrane pool 60, the mixed liquid containing dissolved oxygen sequentially passes through the upper open channel of the upper open guide plate group 50 and the lower open channel of the lower open guide plate group 70 which are separated by the partition wall 40 and are on the same side with the non-aeration membrane pool 60 in the reaction channel 30 under the action of the air stripping power, and then passes through a 180-degree turning flow channel formed by a gap arranged between the partition wall 40 and one end of the reaction channel 30 far away from the membrane pool, and the mixed liquid containing dissolved oxygen is pushed to flow through the gap (i.e. the 180-degree turning flow channel) and enters the other side of the;
s3: the flow pushing path of the mixed liquid containing dissolved oxygen at the other side of the partition wall 40 is similar to that of the flow pushing path at one side of the partition wall 40, the mixed liquid containing dissolved oxygen sequentially passes through the lower opening channel of the lower opening guide plate group 70 and the upper opening channel of the upper opening guide plate group 50 at the same side of the aeration membrane pool 60, the concentration of the dissolved oxygen is gradually reduced along with the flow pushing path of the mixed liquid containing dissolved oxygen in the water flow channel in the reaction channel 30, and the synchronous nitrification and denitrification biochemical reaction under the anoxic environment is realized;
s4: the mixed liquid from the reaction channel 30 enters the membrane tank 60 which is aerated and washed through the lower opening channel of the lower opening guide plate group 70 which is close to the end of the aerated membrane tank 60;
thus realizing one gas stripping circulation and realizing a plurality of gas stripping circulations according to the operation mode.
S5: when the operation time of the membrane component and the aeration device in the aeration membrane pool reaches the design operation time, closing the membrane component and the aeration device in the aeration membrane pool and stopping operation;
s6: and opening the membrane assemblies and the aeration devices in the non-aeration membrane tanks in the step S1 to start running, wherein the gas stripping plug flow mode of the mixed liquid containing dissolved oxygen in the newly opened aeration membrane tanks is the same as the plug flow mode of the mixed liquid containing dissolved oxygen in the aeration membrane tanks in the steps S1-S4, so that the alternate aeration running of the two membrane tanks is realized.
Therefore, by adding the reaction channel 30 on one side of the two membrane tanks 60, and the two membrane tanks 60 are respectively a first membrane tank 601 and a second membrane tank 602, the membrane modules 10 and the aeration devices 20 are arranged in the first membrane tank 601 and the second membrane tank 602, and the first membrane tank 601 and the second membrane tank 602 adopt an alternate aeration operation mode, that is, when the membrane modules 10 in the second membrane tank 602 are subjected to flushing aeration through the aeration devices 20 connected thereto, the membrane modules 10 in the first membrane tank 601 are not aerated, at this time, the aeration devices 20 and the membrane modules 10 in the second membrane tank 602 are opened to operate, the aeration devices 20 and the membrane modules 10 in the first membrane tank 601 are closed to not operate, at this time, the mixed liquid in the second membrane tank 602 crosses the upper opening flow guide wall 80 between the second membrane tank 602 and the first membrane tank 601 under the air stripping effect generated by aeration, and enters the first membrane tank 601 from the second membrane tank 602; after entering the first membrane tank 601, the mixed liquid in the first membrane tank 601 passes through the lower opening channel of the lower opening guide plate group 501 close to the other membrane tank 601 along one side of the partition wall 40, then sequentially passes through the upper opening channel of the upper opening guide plate group 502 and the lower opening channel of the lower opening guide plate group 501 which are separated by the partition wall 40 and are on the same side with the membrane tank 601, then passes through the gap (i.e. 180-degree turning channel) arranged at one end of the partition wall 40 and the reaction channel 30 far away from the membrane tank 60, the dissolved oxygen-containing solution enters the other side of the partition wall 40 through the gap, the plug flow path of the dissolved oxygen-containing solution on the other side of the partition wall 40 is similar to the plug flow on one side of the partition wall 40, sequentially passes through the lower opening channel of the lower opening guide plate group 501 and the upper opening channel of the upper opening guide plate group 502, and finally enters the aeration membrane tank 602 through the lower opening channel of the lower opening guide plate, completing a whole gas stripping plug flow circulation. The flow process is as shown in fig. 3, at this time, the dissolved oxygen-containing water flow sequentially flows through the aerated second membrane tank 602, the non-aerated first membrane tank 601, the reaction channel 30 and the aerated second membrane tank 602, so that a gas stripping cycle is realized, a plurality of gas stripping cycles are realized according to the operation mode, the dissolved oxygen is gradually consumed and reduced in the process that the dissolved oxygen-containing water flow generated by flushing aeration flows through the water flow channel formed by the upper opening guide plate group 50 and the lower opening guide plate group 70 on both sides of the partition wall 40 in the reaction channel 30, and in the process that the dissolved oxygen is gradually reduced, an aerobic condition required by nitrification reaction and an anoxic condition required by denitrification reaction can be met, so that a low dissolved oxygen biochemical reaction system for synchronous nitrification and denitrification is realized, and the biochemical reaction efficiency is improved. Meanwhile, the arrangement of a nitrifying liquid reflux system is cancelled, the process is simplified, the use of a liquid circulating pump is reduced, and further the energy consumption and the use of equipment are reduced.
Similarly, when the first membrane tank 601 is aerated and the second membrane tank 602 is not aerated, the gas-stripping water flow sequentially flows through the aerated first membrane tank 601, the non-aerated second membrane tank 602 and the reaction channel 30 and finally returns to the aerated first membrane tank 601, so that a gas-stripping cycle is realized, and a plurality of gas-stripping plug-flow cycles are realized according to the operation mode.
In conclusion, the aeration is switched between the first membrane tank 601 and the second membrane tank 602 at regular time, so that the flow direction conversion of the reaction channel 30 and the bidirectional flushing of the membranes are realized, and the bidirectional flushing of the membranes can avoid the sludge in the membrane tank 60 from depositing at dead angles, so that in the process of utilizing the air lift generated by the flushing aeration of the MBR membrane bioreactor sewage treatment process as power to carry out liquid plug flow to realize the gradual reduction of dissolved oxygen in water, the aerobic and anoxic conditions required by biochemical reaction can be met simultaneously, the low dissolved oxygen biochemical reaction system for synchronous nitrification and denitrification is further realized, and the biochemical reaction efficiency is improved. Meanwhile, the arrangement of a nitrifying liquid reflux system is cancelled, the process is simplified, the use of a liquid circulating pump is reduced, and further the energy consumption and the use of equipment are reduced.
The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, which shall fall within the scope of the present invention.
Claims (8)
1. A biochemical reaction system with low dissolved oxygen is characterized by comprising two membrane tanks, wherein each membrane tank is internally provided with a membrane component, the bottoms of the membrane components are respectively provided with an aeration device, the two membrane tanks are adjacently arranged, an alternative aeration operation mode is adopted between the two membrane tanks, the aeration devices are used for flushing and aerating the membrane components, and the biochemical reaction system also comprises a reaction channel, a partition wall, at least one upper opening guide plate group and at least one lower opening guide plate group, which are communicated with the two membrane tanks;
the reaction channel is communicated with the two membrane tanks through one of the lower opening guide plate groups to form a reaction area, and the reaction channel is used for enabling dissolved oxygen-containing solution during aeration of one of the membrane tanks to flow into the reaction channel from one guide plate of the lower opening guide plate groups through the gas stripping action to carry out low dissolved oxygen biochemical reaction;
the partition wall is vertically arranged at the bottom end of the reaction area, divides the reaction area into two parts from the middle to form a lengthened flow channel, and a gap is arranged between the partition wall and the wall of the reaction channel at one side of the reaction channel far away from the two membrane tanks to form a 180-degree turning flow channel;
the at least one upper opening guide plate group and the at least one lower opening guide plate group are arranged in the reaction channel at intervals and are positioned at two sides of the partition wall, wherein a lower opening is formed in the bottom of the lower opening guide plate group close to the two membrane ponds, an upper opening is formed in the top of the upper opening guide plate group adjacent to the lower opening guide plate group, and an upper opening and a lower opening are formed in the at least one upper opening guide plate group and the at least one lower opening guide plate group in a staggered mode to provide flow channels for water flow and used for increasing the length of the flow channels and the hydraulic retention time;
the distance between the lower opening of at least one lower opening guide plate group and the bottom of the reaction channel is 0.3-0.5 m.
2. The biochemical reaction system with low dissolved oxygen according to claim 1, wherein a partition wall is arranged between the two membrane tanks, the partition wall between the two membrane tanks is an upper opening guide wall, the height of the upper opening guide wall is lower than the height of the periphery of the membrane tank, and the upper opening guide wall is used for turning the dissolved oxygen-containing solution in aeration of one membrane tank over the top of the upper opening guide wall to enter the other membrane tank through air stripping.
3. The biochemical reaction system with low dissolved oxygen according to claim 1, wherein the number of the upper opening guide plate groups is one, the number of the lower opening guide plate groups is two, and one upper opening guide plate group is located between two lower opening guide plate groups, so that the reaction channel and two membrane tanks form a water flow channel required by biochemical reaction with low dissolved oxygen.
4. The biochemical reaction system with low dissolved oxygen according to claim 1, wherein the aeration device is communicated with an air inlet pipeline and a blower, and one end of the air inlet pipeline is connected with the aeration device, and the other end of the air inlet pipeline is connected with the blower.
5. The biochemical reaction system with low dissolved oxygen according to claim 4, wherein a sludge discharge pipeline is further arranged on the membrane tank for discharging sludge accumulated for a long time in the membrane tank.
6. The biochemical reaction system with low dissolved oxygen according to claim 5, wherein an overflow pipe is provided at an upper portion of the reaction channel for discharging an excessive amount of wastewater out of the reaction channel when the amount of water exceeds a designed treatment amount.
7. The biochemical reaction system with low dissolved oxygen according to claim 1, further comprising a water pump, a valve, and a meter.
8. A biochemical reaction process with low dissolved oxygen comprises the following steps: the biochemical reaction system with low dissolved oxygen according to any one of claims 1 to 7, wherein the biochemical reaction process with low dissolved oxygen comprises the following steps:
s1: the membrane component and the aeration device of one membrane pool are started to operate (the membrane component and the aeration device of the other membrane pool are in a closed state), the membrane component connected with the aeration device is aerated and washed by the operating aeration device, and the mixed liquid containing dissolved oxygen in the aeration membrane pool enters the other non-aeration membrane pool through the upper opening flow guide wall between the two membrane pools under the action of air stripping;
s2: after entering the non-aeration membrane pool, the mixed liquid containing dissolved oxygen in the aeration membrane pool enters a reaction channel through a lower opening channel of a lower opening guide plate group close to the end of the non-aeration membrane pool, the mixed liquid containing dissolved oxygen sequentially passes through an upper opening channel of the upper opening guide plate group and a lower opening channel of the lower opening guide plate group which are separated by a partition wall and are on the same side with the non-aeration membrane pool in the reaction channel under the action of the air stripping power, then passes through a 180-degree turning flow channel formed by a gap arranged between the partition wall and one end of the reaction channel far away from the membrane pool, and the mixed liquid containing dissolved oxygen flows through the gap (namely the 180-degree turning flow channel) to enter the other side of the partition wall;
s3: the flow pushing path of the mixed liquid containing dissolved oxygen at the other side of the partition wall is similar to that of one side of the partition wall, the mixed liquid containing dissolved oxygen sequentially passes through the lower opening channel of the lower opening guide plate group and the upper opening channel of the upper opening guide plate group at the same side of the aeration membrane pool, the concentration of the dissolved oxygen is gradually reduced along with the flow pushing of the mixed liquid containing dissolved oxygen in the water flow channel in the reaction channel, and the biochemical reaction of synchronous nitrification and denitrification under the anoxic environment is realized;
s4: mixed liquor from the reaction channel enters the aeration-washed membrane pool through a lower opening channel of a lower opening guide plate group close to the end of the aeration membrane pool;
thus realizing one gas stripping circulation, and realizing multiple gas stripping circulations according to the operation mode;
s5: when the operation time of the membrane component and the aeration device in the aeration membrane pool reaches the design operation time, closing the membrane component and the aeration device in the aeration membrane pool and stopping operation;
s6: and opening the membrane assemblies and the aeration devices in the non-aeration membrane tanks in the step S1 to start running, wherein the gas stripping plug flow mode of the mixed liquid containing dissolved oxygen in the newly opened aeration membrane tank is the same as the plug flow mode of the mixed liquid containing dissolved oxygen in the aeration membrane tanks in the steps S1-S4, so that the alternate aeration running of the two membrane tanks is realized.
Priority Applications (1)
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| CN115557607A (en) * | 2022-08-31 | 2023-01-03 | 达斯玛环境科技（北京）有限公司 | Integrated biological reaction tank system and method |
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