CN210595457U - Improved oxidation ditch sewage biochemical treatment system - Google Patents
Improved oxidation ditch sewage biochemical treatment system Download PDFInfo
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- CN210595457U CN210595457U CN201921324252.4U CN201921324252U CN210595457U CN 210595457 U CN210595457 U CN 210595457U CN 201921324252 U CN201921324252 U CN 201921324252U CN 210595457 U CN210595457 U CN 210595457U
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Abstract
The utility model relates to a water treatment technical field especially relates to an improvement type oxidation ditch sewage biochemical treatment system, including A oxidation ditch and B oxidation ditch, characterized by: the oxidation ditch A and the oxidation ditch B are arranged in parallel and separated by a separation wall; the isolation wall is provided with a communication port; a first ammonia nitrogen online monitoring instrument is arranged on the right side in the oxidation ditch A; a second ammonia nitrogen online monitoring instrument is arranged on the right side in the oxidation ditch B, and a nitrate nitrogen online monitoring instrument is arranged on the left side; the system also comprises an anaerobic bacteria selection pool, a carbon source storage tank filled with a carbon source and a PAC storage tank filled with a PAC solution, wherein the carbon source storage tank is communicated with the B oxidation ditch; the anaerobic bacteria selecting pool is respectively communicated with the oxidation ditch A and the oxidation ditch B; the oxidation ditch B is communicated with a secondary sedimentation tank; the PAC storage tank is communicated with the first drain pipe through a PAC feeding pipe. The system is suitable for a biochemical treatment section of a sewage treatment plant, and has the advantages of energy conservation, consumption reduction and good effluent quality.
Description
Technical Field
The utility model relates to a water treatment technical field especially relates to an improvement type oxidation ditch sewage biochemical treatment system.
Background
In recent years, the living standard of people is increased rapidly, higher requirements on water quality treatment are met, and the establishment of a large number of sewage treatment plants makes the sewage discharge standard stricter, especially total nitrogen. The improvement of the discharge standard further aggravates the energy consumption in the sewage treatment process, so that the energy consumption problem of the sewage treatment plant is more and more emphasized.
At present, the two treatment processes of an oxidation ditch and A2/O have wider application range in the field of water treatment, and the oxidation ditch has the characteristics of simple process flow, stable effluent quality, low operation cost and general dephosphorization and denitrification effects; A2/O has the characteristics that the effluent quality is stable, and particularly, a better synchronous denitrification and dephosphorization effect can be achieved through proper improvement, but the process flow is relatively complex, the operation cost is higher, and particularly, the removal of total nitrogen has a larger relationship with the reflux amount of digestive juice, so the energy consumption is higher.
Therefore, whether the water quality treated by the method can reach the standard stably (the total nitrogen of the effluent is less than 10mg/L) and reduce the operation energy consumption by the development of a new technology or the improvement of the prior art is a common research and development direction for technicians in the industry at present.
Disclosure of Invention
For solving the problem that proposes among the above-mentioned background art, the utility model provides an improvement type oxidation ditch sewage biochemical treatment system, this system are applicable to sewage treatment plant's biochemical treatment section, have energy saving and consumption reduction, go out the advantage that water quality of water is good.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an improvement type oxidation ditch sewage biochemical treatment system, includes that the right side equipartition has put aeration equipment's A oxidation ditch and B oxidation ditch, aeration equipment in the A oxidation ditch and the aeration equipment in the B oxidation ditch are connected with first aeration fan and second aeration fan respectively, and its structural feature is: the oxidation ditch A and the oxidation ditch B are arranged in parallel and are separated by a common partition wall in the middle; a communicating opening for communicating the oxidation ditch A and the oxidation ditch B is formed in the side wall at the left end of the isolation wall; a first ammonia nitrogen online monitoring instrument is arranged on the right side in the oxidation ditch A; a second ammonia nitrogen online monitoring instrument is installed on the right side in the oxidation ditch B, and a nitrate nitrogen online monitoring instrument is installed on the left side; the system also comprises an anaerobic bacteria selection pool, a carbon source storage tank filled with a carbon source and a PAC storage tank filled with a PAC solution, wherein the carbon source storage tank is communicated with the left side in the B oxidation ditch through a carbon source adding pipe, the carbon source adding pipe is sequentially provided with a first flow regulating valve and a first flow meter, and the first flow regulating valve is arranged between the carbon source storage tank and the first flow meter; one side of the anaerobic bacteria selecting pool is connected with a water inlet pump, and the other side of the anaerobic bacteria selecting pool is respectively communicated with the right side of the oxidation ditch A and the right side of the oxidation ditch B through a first sewage inlet pipe and a second sewage inlet pipe; the right end of the oxidation ditch B is communicated with a secondary sedimentation tank through a first sewage discharge pipe; the PAC storage tank is communicated with the first sewage discharge pipe through a PAC feeding pipe, a second flow regulating valve and a second flow meter are sequentially arranged on the PAC feeding pipe, and the second flow regulating valve is arranged between the PAC storage tank and the second flow meter; a total phosphorus on-line monitoring instrument is arranged on the first sewage discharge pipe and is arranged between the PAC feeding pipe and the B oxidation ditch; first ammonia nitrogen on-line monitoring instrument, second ammonia nitrogen on-line monitoring instrument, nitrate nitrogen on-line monitoring instrument, total phosphorus on-line measuring instrument, first flow control valve, first flowmeter, first aeration fan, second aeration fan and intake pump are equallyd divide and are respectively with PLC controller electric connection.
Preferably, a third flow regulating valve and a third flow meter are sequentially arranged on the first sewage inlet pipe, and the third flow meter is arranged between the third flow regulating valve and the oxidation ditch A; a fourth flow regulating valve and a fourth flowmeter are sequentially arranged on the second sewage inlet pipe, and the fourth flowmeter is arranged between the fourth flow regulating valve and the oxidation ditch B; and the third flow regulating valve, the third flow meter, the fourth flow regulating valve and the fourth flow meter are respectively and electrically connected with the PLC.
Preferably, the bottom of the secondary sedimentation tank is communicated with the anaerobic bacteria selection tank through a return pipe, and a return pump and a fifth flow regulating valve are sequentially arranged on the return pipe; the return pipe is also provided with return branch pipes for discharging redundant sludge in the secondary sedimentation tank, and the return branch pipes are provided with sixth flow regulating valves; the reflux pump, the fifth flow regulating valve and the sixth flow regulating valve are respectively electrically connected with the PLC.
Preferably, a first weir gate is arranged at the right end of the oxidation ditch B, one end of the first sewage discharge pipe is communicated with the secondary sedimentation tank, and the other end of the first sewage discharge pipe penetrates through the upper part of the first weir gate to be communicated with the oxidation ditch B.
Preferably, the right end of the oxidation ditch A is provided with a second weir gate, a second blow-off pipe is communicated between the second weir gate and the first blow-off pipe, one end of the second blow-off pipe passes through the upper part of the second weir gate and is communicated with the oxidation ditch A, and the other end of the second blow-off pipe is communicated with and fixed on the first blow-off pipe between the oxidation ditch B and the PAC feeding pipe.
Preferably, the ratio of the area provided with the aeration device in the oxidation ditch A to the total area of the oxidation ditch A is 2: 3; the ratio of the area of the aeration device arranged in the oxidation ditch B to the total area of the oxidation ditch B is 1: 3.
Preferably, the aeration devices in the oxidation ditch A and the oxidation ditch B are aeration discs.
Preferably, flow impellers are arranged in the oxidation ditch A and the oxidation ditch B and are electrically connected with the PLC.
Preferably, the communication port is formed at the bottom of the partition wall; and a hard L-shaped water guide pipe communicated with the communicating port is arranged in the oxidation ditch A, the L-shaped water guide pipe is vertically fixed at the bottom of the oxidation ditch A, an opening at the lower end of the L-shaped water guide pipe is communicated with the communicating port, and the height of an opening at the upper end of the L-shaped water guide pipe is not lower than half of the height of the partition wall.
Preferably, the rate of the water drained from the anaerobic bacteria selecting pond into the oxidation ditch A is 2.3-3.1 times of the rate of the water drained into the oxidation ditch B.
The utility model has the advantages that: the system mainly performs nitrification on the sewage through the oxidation ditch A and performs denitrification on the sewage through the oxidation ditch B; the sewage in the oxidation ditch A is treated and then enters the oxidation ditch B for further treatment, and the treatment is carried out step by step, so that on one hand, the water inflow and the purification time of the sewage are easier to control, and on the other hand, the ammonia nitrogen content, the nitrate nitrogen content, the total phosphorus content and the aeration quantity of an aeration device in the sewage are easier to control and monitor, thereby achieving the purposes of saving energy and reducing consumption; meanwhile, the nitrification and denitrification of the sewage are more thorough, and the sewage can achieve a better purification effect.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Wherein: 1-A oxidation ditch; 2-B oxidation ditch; 3-a partition wall; 4-a communication port; 5-a first ammonia nitrogen online monitoring instrument; 6-a second ammonia nitrogen online monitoring instrument; 7-nitrate nitrogen on-line monitoring instrument; 8-anaerobic bacteria selection pool; 9-a carbon source storage tank; 10-PAC storage tank; 11-a carbon source feeding pipe; 12-a first flow regulating valve; 13-a first flow meter; 14-a water inlet pump; 15-a first sewage inlet pipe; 16-a second sewage inlet pipe; 17-a first drain pipe; 18-a secondary sedimentation tank; 19-PAC dosing tube; 20-a second flow regulating valve; 21-a second flow meter; 22-total phosphorus on-line monitoring instrument; 23-a first aeration fan; 24-a second aeration fan; 25-third flow regulating valve; 26-a third flow meter; 27-a fourth flow regulating valve; 28-a fourth flow meter; 29-a return conduit; 30-a reflux pump; 31-a fifth flow regulating valve; 32-a return manifold; 33-a sixth flow regulating valve; 34-a first weir gate; 35-a second weir gate; 36-a second sewage draining pipe; 37-an aeration disc; 38-a flow impeller; 39-L type water guide pipe.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
An improved oxidation ditch sewage biochemical treatment system is shown in figure 1 and comprises an oxidation ditch A1 and an oxidation ditch B2, wherein aeration devices are uniformly arranged on the right side of the oxidation ditch A, and the aeration amount in the oxidation ditch A1 and the oxidation ditch B2 is conveniently controlled; the oxidation ditch A1 and the oxidation ditch B2 are arranged in parallel and are separated by a common partition wall 3 in the middle, so that sewage in the two oxidation ditches can be subjected to nitration reaction and denitrification reaction at the same time conveniently, control and labor division are facilitated, the oxidation ditch A1 and the oxidation ditch B2 have different side points for sewage treatment, the oxidation ditch A1 emphasizes on nitrification of the sewage, ammonia nitrogen in the sewage is converted into nitrate nitrogen, COD (chemical oxygen demand) and phosphorus in the sewage are degraded, and the oxidation ditch B2 emphasizes on denitrification of the sewage, so that the nitrate nitrogen in the sewage is converted into nitrogen for removal; in order to facilitate the sewage treated by nitrification in the oxidation ditch A1 to enter the oxidation ditch B2 for further denitrification treatment, a communicating opening 4 communicating the oxidation ditch A1 with the oxidation ditch B2 is formed in the side wall at the left end of the partition wall 3; a first ammonia nitrogen online monitoring instrument 5 is arranged on the right side in the oxidation ditch A1; a second ammonia nitrogen online monitoring instrument 6 is arranged on the right side in the oxidation ditch B2, and a nitrate nitrogen online monitoring instrument 7 is arranged on the left side; the first ammonia nitrogen online monitoring instrument 5 is used for monitoring the ammonia nitrogen value in the oxidation ditch A1 and is used as a reference for the aeration amount in the oxidation ditch A1, and the second ammonia nitrogen online monitoring instrument 6 and the nitrate nitrogen online monitoring instrument 7 are respectively used for monitoring the ammonia nitrogen value and the nitrate nitrogen value in the oxidation ditch B2 and are used as a reference for the aeration amount and an external carbon source in the oxidation ditch B2. The system also comprises an anaerobic bacteria selection pool 8, a carbon source storage tank 9 filled with a carbon source and a PAC storage tank 10 filled with a PAC solution, wherein the carbon source contained in the carbon source storage tank 9 is a sodium acetate solution or a methanol solution, the carbon source storage tank 9 is communicated with the left side in the B oxidation ditch 2 through a carbon source adding pipe 11, the carbon source adding pipe 11 is sequentially provided with a first flow regulating valve 12 and a first flow meter 13, and the first flow regulating valve 12 is arranged between the carbon source storage tank 9 and the first flow meter 13; by arranging the carbon source storage tank 9, a carbon source is conveniently added into the oxidation ditch B2, and the excessive content of nitrate nitrogen when the sewage enters the oxidation ditch and is discharged out of the oxidation ditch due to the excessively low carbon-nitrogen ratio is prevented; one side of the anaerobic bacteria selecting pool 8 is connected with a water inlet pump 14, raw sewage can be pumped into the anaerobic bacteria selecting pool 8 through the water inlet pump 14, the other side of the anaerobic bacteria selecting pool 8 is respectively communicated with the right side of the oxidation ditch A1 and the right side of the oxidation ditch B2 through a first sewage inlet pipe 15 and a second sewage inlet pipe 16, and pump bodies are also respectively arranged on the first sewage inlet pipe 15 and the second sewage inlet pipe 16, so that the sewage in the anaerobic bacteria selecting pool 8 can be conveniently pumped into the oxidation ditch A1 and the oxidation ditch B2 respectively; the right end of the oxidation ditch B2 is communicated with a secondary sedimentation tank 18 through a first sewage discharge pipe 17, and sewage treated by the oxidation ditch B2 is discharged into the secondary sedimentation tank 18 through the first sewage discharge pipe 17 for sedimentation; the PAC storage tank 10 is communicated with the first sewage discharge pipe 17 through a PAC feeding pipe 19, a second flow regulating valve 20 and a second flow meter 21 are sequentially arranged on the PAC feeding pipe 19, and the second flow regulating valve 20 is arranged between the PAC storage tank 10 and the second flow meter 21; a total phosphorus on-line monitoring instrument 22 is arranged on the first sewage discharge pipe 17, and the total phosphorus on-line monitoring instrument 22 is arranged between the PAC feeding pipe 19 and the B oxidation ditch 2; the total phosphorus on-line monitoring instrument 22 is used for monitoring the total phosphorus content in the sewage treated by the oxidation ditch and is used as a reference for adding PAC solution amount into the sewage; by arranging the PAC storage tank 10, PAC solution is conveniently added into the sewage treated by the oxidation ditch for further removing phosphorus in the sewage and enhancing the sedimentation performance of sludge, and the effluent of the oxidation ditch and the PAC solution are mixed and then enter the secondary sedimentation tank 18 for sludge-water separation. First ammonia nitrogen on-line monitoring instrument 5, second ammonia nitrogen on-line monitoring instrument 6, nitrate nitrogen on-line monitoring instrument 7, total phosphorus on-line measuring instrument 22, first flow control valve 12, first flowmeter 13, first aeration fan 23, second aeration fan 24 and intake pump 14 are equallyd divide and are respectively with PLC controller electric connection. The first aeration fan 23 and the second aeration fan 24 are both variable frequency fans, and the water inlet pump 14 is a variable frequency water pump.
The system is characterized in that an oxidation ditch A1 and an oxidation ditch B2 are arranged in parallel and are communicated through a communication port 4, and the principle of multi-point water inlet is utilized, so that a carbon source in sewage is fully utilized to participate in denitrification reaction, and the aeration quantity of an aerobic tank is reduced. Most of the raw sewage enters the oxidation ditch A for degradation through the anaerobic bacteria selection tank 8, because the oxidation ditch has aerobic and anoxic environments simultaneously and the area of an aerobic area is larger, therefore, the sewage entering the oxidation ditch A1 not only can fully degrade COD in an aerobic environment, convert ammonia nitrogen in the sewage into nitrate nitrogen and absorb a small amount of phosphorus, but also can convert a small amount of nitrate nitrogen into nitrogen to be discharged in an anoxic environment, the partial sewage enters the oxidation ditch B2 after full nitrification in the oxidation ditch A, fresh sewage continuously discharged from the anaerobic bacteria selecting pool 8 is arranged in the oxidation ditch B2, and the aeration device in the oxidation ditch 2B occupies less area and has weaker aeration, so the nitrate nitrogen in the oxidation ditch 2B can be effectively removed, meanwhile, because of the aeration function, a small amount of residual COD and ammonia nitrogen can be effectively removed, and finally discharged into the secondary sedimentation tank 18 through the first sewage pipe 17 on the right side of the B oxidation ditch 2.
The system mainly performs nitrification on sewage through the oxidation ditch A1 and performs denitrification on sewage through the oxidation ditch B2; after the sewage in the oxidation ditch A1 is treated, the sewage enters the oxidation ditch B2 for further treatment, and the treatment is carried out step by step, so that on one hand, the water inflow and the purification time of the sewage are easier to control, and on the other hand, the ammonia nitrogen content, the nitrate nitrogen content, the total phosphorus content and the aeration quantity of an aeration device in the sewage are easier to control and monitor, thereby achieving the purposes of energy conservation and consumption reduction; meanwhile, the nitrification and denitrification of the sewage are more thorough, and the sewage can achieve a better purification effect.
In this embodiment, in order to accurately control the amount of sewage respectively entering the oxidation ditch a 1 and the oxidation ditch B2 from the anaerobic bacteria selecting tank 8 and conveniently adjust the water inflow proportion of the two oxidation ditches, a third flow regulating valve 25 and a third flow meter 26 are sequentially arranged on the first sewage inlet pipe 15, and the third flow meter 26 is arranged between the third flow regulating valve 25 and the oxidation ditch a 1; a fourth flow regulating valve 27 and a fourth flow meter 28 are sequentially arranged on the second sewage inlet pipe 16, and the fourth flow meter 28 is arranged between the fourth flow regulating valve 27 and the B oxidation ditch 2; the third flow regulating valve 25, the third flow meter 26, the fourth flow regulating valve 27 and the fourth flow meter 28 are respectively electrically connected with the PLC, and the opening degree of the third flow regulating valve 25 and the opening degree of the fourth flow regulating valve 27 are controlled through the PLC.
In this embodiment, the bottom of the secondary sedimentation tank 18 is communicated with the anaerobic bacteria selecting tank 8 through a return pipe 29, and a return pump 30 and a fifth flow regulating valve 31 are sequentially arranged on the return pipe 29; the return pipe 29 is also provided with return branch pipes 32 for discharging excess sludge in the secondary sedimentation tank 18, and the return branch pipes 32 are provided with sixth flow regulating valves 33; the reflux pump 30, the fifth flow regulating valve 31 and the sixth flow regulating valve 33 are respectively electrically connected with the PLC. Set up like this, in former sewage and the backward flow mud in the secondary sedimentation pond 18 all can enter into anaerobism bacteria selection pond 8, and the phosphorus accumulation fungus in the mud releases internal phosphorus under the anaerobic environment of anaerobism bacteria selection pond 8 to the convenience is in the regional better phosphorus in the absorption sewage that is equipped with aeration equipment of A oxidation ditch 1 and B oxidation ditch 2.
In this embodiment, a first weir gate 34 is provided at the right end of the B oxidation ditch 2, one end of the first sewage drain pipe 17 is communicated with the secondary sedimentation tank 18, and the other end thereof passes through the upper part of the first weir gate 34 and is communicated with the B oxidation ditch 2. The right end of the oxidation ditch A1 is provided with a second weir gate 35, the second weir gate 35 is communicated with a second sewage discharge pipe 36 between the first sewage discharge pipe 17, one end of the second sewage discharge pipe 36 is passed through the upper part of the second weir gate 35 and is communicated with the oxidation ditch A1, and the other end of the second sewage discharge pipe is communicated with and fixed on the first sewage discharge pipe 17 between the oxidation ditch B2 and the PAC feeding pipe 19. The maximum liquid level of the sewage in the oxidation ditch A1 and the oxidation ditch B2 can be conveniently controlled by adjusting the heights of the first weir gate 34 and the second weir gate 35; the second sewage draining pipe 36 is arranged so that the oxidation ditch A1 can also be communicated with the secondary sedimentation tank 18, so that the oxidation ditch A1 can also be used independently under the condition of necessity.
In the embodiment, the ratio of the area of the A oxidation ditch 1 in which the aeration devices are arranged to the total area of the A oxidation ditch 1 is 2: 3; the ratio of the area of the B oxidation + ditch 2 in which the aeration device is arranged to the total area of the B oxidation ditch 2 is 1: 3. Due to the arrangement, the aerobic area in the oxidation ditch A1 occupies a larger area, so that ammonia nitrogen in the sewage can be fully converted into nitrate nitrogen, COD (chemical oxygen demand) can be degraded, phosphorus can be absorbed, and meanwhile, part of the nitrate nitrogen can be converted into nitrogen in an anoxic environment and discharged from the sewage; and because the area that the aeration equipment occupies is less in B oxidation ditch 2, aeration rate is less with A oxidation ditch 1, make the effect of getting rid of the nitrate nitrogen in B oxidation ditch 2 better, the plus carbon source of drop-in from carbon source storage tank 9 of deuterogamying can get rid of more thoroughly to the nitrate nitrogen in B oxidation ditch 2, because have weaker aeration function simultaneously, can get rid of remaining a small amount of ammonia nitrogen and COD in the sewage, the sewage after the processing is finally discharged to secondary sedimentation 18 from the first blow-off pipe 17 that B oxidation ditch 2 right side communicates and is depositd in the pond.
In this embodiment, the aeration devices in the oxidation ditch A1 and the oxidation ditch B2 are both aeration disks 37. Can have sufficient contact area with the sewage in the oxidation ditch, and the aeration is more even.
In this embodiment, in order to conveniently control the flow rate of the sewage in the oxidation ditch a 1 and the oxidation ditch B2, flow pushers 38 are respectively arranged in the oxidation ditch a 1 and the oxidation ditch B2, and the flow pushers 38 are electrically connected with the PLC controller. The rotation speed of the flow pushing device 38 is controlled by the PLC controller, so that the aim of changing the flow speed of the sewage in the oxidation ditch is fulfilled.
In this embodiment, the communication port 4 is opened at the bottom of the partition wall 3; a hard L-shaped water guide pipe 39 communicated with the communication port 4 is arranged in the oxidation ditch A1, the L-shaped water guide pipe 39 is vertically fixed at the bottom of the oxidation ditch A1, an opening at the lower end of the L-shaped water guide pipe 39 is communicated with the communication port 4, and the height of an opening at the upper end is not lower than half of the height of the separation wall 3. By this arrangement, the sewage in the oxidation ditch A1 can have longer nitrification time, and part of the sewage in the oxidation ditch B2 can be prevented from flowing back to the oxidation ditch A1.
In this embodiment, the rate of the water drained from the anaerobic bacteria-selecting pond 8 into the oxidation ditch A1 is 2.5 times of the rate of the water drained into the oxidation ditch B2. By the arrangement, the sewage in the oxidation ditch A1 and the oxidation ditch B2 can be subjected to nitrification reaction and denitrification reaction more thoroughly, and the water purification effect is better.
The working mode and principle are as follows: when the anaerobic bacteria selection tank works, the original sewage is pumped into the anaerobic bacteria selection tank 8 through the water inlet pump 14 and then is respectively discharged into the oxidation ditch A1 and the oxidation ditch B2, and the opening degree of the third flow regulating valve 25 and the opening degree of the fourth flow regulating valve 27 are respectively regulated by controlling the PLC, so that the rate of the anaerobic bacteria selection tank 8 discharging water into the oxidation ditch A1 is 2.5 times of the rate of the anaerobic bacteria selection tank 8 discharging water into the oxidation ditch B2. The sewage entering the oxidation ditch A1 can degrade most organic matters in the sewage under the action of microorganisms in the ditch A, an aeration fan for providing aeration for an aeration device in the oxidation ditch A1 is adjusted by a PLC (programmable logic controller), so that the sewage in the oxidation ditch A1 can be subjected to sufficient nitration reaction under aerobic conditions, most ammonia nitrogen in the sewage is converted into nitrate nitrogen, and the ammonia nitrogen value in the oxidation ditch A1 is controlled to be about 5-10 mg/L by monitoring of a first ammonia nitrogen online monitoring instrument 5; the sewage in the oxidation ditch A1 enters the oxidation ditch B2 from the upper end opening of the L-shaped water guide pipe 39 after being treated and the water level reaches the height of the upper end opening of the L-shaped water guide pipe 39. The carbon source in the sewage in the oxidation ditch B2 and the carbon source added from the carbon source storage tank 9 are utilized for denitrification, the nitrate nitrogen in the oxidation ditch B2 is removed, the opening degree of the first flow regulating valve 12 is regulated by the PLC controller and is matched with the first flow meter 13, and the adding amount of the carbon source can be controlled; monitoring by a nitrate nitrogen online monitoring instrument 7 to control the nitrate nitrogen value in the oxidation ditch 2B to be 3-7 mg/L; meanwhile, the B oxidation ditch 2 is also internally provided with an aeration device, so that the original sewage in the B oxidation ditch 2 and the sewage discharged from the A oxidation ditch 1 can be aerated, the ammonia nitrogen, phosphorus and residual COD in the sewage are further removed, and the ammonia nitrogen value in the B oxidation ditch 2 is controlled to be 1.5-3 mg/L by monitoring through a second ammonia nitrogen online monitoring instrument 6. The height of the first weir 34 on the oxidation ditch A1 and the height of the second weir 35 on the oxidation ditch B2 can be adjusted to control the highest water level in the oxidation ditch. The sewage further treated by the oxidation ditch B2 enters a secondary sedimentation tank 18 through a first sewage discharge pipe 17 for sludge-water separation; in order to reduce the total phosphorus content in the sewage, the PAC solution in the PAC storage tank 10 is added into the first sewage discharge pipe 17 so as to be uniformly mixed with the passing sewage, thereby removing the phosphorus in the sewage and simultaneously leading the sedimentation performance of the sludge to be better, the opening degree of the second flow regulating valve 20 is regulated by the PLC controller and is matched with the second flow meter 21, the adding amount of the PAC solution can be controlled, and the total phosphorus content in the water entering the secondary sedimentation tank 18 is controlled below 0.2mg/L by the monitoring of a total phosphorus on-line monitoring instrument 22. The sewage enters a subsequent treatment process after mud-water separation in the secondary sedimentation tank 18, the sludge is divided into two trends, one part of the sludge flows back to the anaerobic bacteria selection tank 8 through a return pipe 29, phosphorus accumulating bacteria in the sludge release phosphorus in the body under the anaerobic environment in the anaerobic bacteria selection tank 8 so as to absorb the phosphorus in the sewage after entering an oxidation ditch; the other part is discharged from the treatment system.
The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (10)
1. The utility model provides an improvement type oxidation ditch sewage biochemical treatment system, includes that the right side equipartition has put aeration equipment's A oxidation ditch (1) and B oxidation ditch (2), aeration equipment in A oxidation ditch (1) and the aeration equipment in B oxidation ditch (2) are connected with first aeration fan (23) and second aeration fan (24) respectively, its characterized in that: the oxidation ditch A (1) and the oxidation ditch B (2) are arranged in parallel and separated by a common partition wall (3) in the middle; a communicating opening (4) for communicating the oxidation ditch A (1) and the oxidation ditch B (2) is formed in the side wall of the left end of the partition wall (3);
a first ammonia nitrogen online monitoring instrument (5) is arranged on the right side in the oxidation ditch A (1); a second ammonia nitrogen online monitoring instrument (6) is arranged on the right side in the oxidation ditch B (2), and a nitrate nitrogen online monitoring instrument (7) is arranged on the left side; the system also comprises an anaerobic bacteria selection pool (8), a carbon source storage tank (9) filled with a carbon source and a PAC storage tank (10) filled with a PAC solution, wherein the carbon source storage tank (9) is communicated with the left side in the B oxidation ditch (2) through a carbon source feeding pipe (11), the carbon source feeding pipe (11) is sequentially provided with a first flow regulating valve (12) and a first flow meter (13), and the first flow regulating valve (12) is arranged between the carbon source storage tank (9) and the first flow meter (13);
one side of the anaerobic bacteria selecting pool (8) is connected with a water inlet pump (14), and the other side of the anaerobic bacteria selecting pool is respectively communicated with the right side of the oxidation ditch A (1) and the right side of the oxidation ditch B (2) through a first sewage inlet pipe (15) and a second sewage inlet pipe (16);
the right end of the oxidation ditch B (2) is communicated with a secondary sedimentation tank (18) through a first sewage discharge pipe (17);
the PAC storage tank (10) is communicated with the first sewage discharge pipe (17) through a PAC feeding pipe (19), a second flow regulating valve (20) and a second flow meter (21) are sequentially arranged on the PAC feeding pipe (19), and the second flow regulating valve (20) is arranged between the PAC storage tank (10) and the second flow meter (21);
a total phosphorus online monitoring instrument (22) is arranged on the first sewage discharge pipe (17), and the total phosphorus online monitoring instrument (22) is arranged between the PAC feeding pipe (19) and the B oxidation ditch (2);
the system is characterized in that the first ammonia nitrogen online monitoring instrument (5), the second ammonia nitrogen online monitoring instrument (6), the nitrate nitrogen online monitoring instrument (7), the total phosphorus online detecting instrument (22), the first flow regulating valve (12), the first flow meter (13), the first aeration fan (23), the second aeration fan (24) and the water inlet pump (14) are respectively and electrically connected with the PLC.
2. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: a third flow regulating valve (25) and a third flow meter (26) are sequentially arranged on the first sewage inlet pipe (15), and the third flow meter (26) is arranged between the third flow regulating valve (25) and the oxidation ditch A (1); a fourth flow regulating valve (27) and a fourth flowmeter (28) are sequentially arranged on the second sewage inlet pipe (16), and the fourth flowmeter (28) is arranged between the fourth flow regulating valve (27) and the oxidation ditch B (2); and the third flow regulating valve (25), the third flow meter (26), the fourth flow regulating valve (27) and the fourth flow meter (28) are respectively electrically connected with the PLC.
3. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: the bottom of the secondary sedimentation tank (18) is communicated with the anaerobic bacteria selecting tank (8) through a return pipe (29), and a return pump (30) and a fifth flow regulating valve (31) are sequentially arranged on the return pipe (29); the return pipe (29) is also provided with return branch pipes (32) for discharging redundant sludge in the secondary sedimentation tank (18), and the return branch pipes (32) are provided with sixth flow regulating valves (33); the reflux pump (30), the fifth flow regulating valve (31) and the sixth flow regulating valve (33) are respectively electrically connected with the PLC.
4. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: the right end of the B oxidation ditch (2) is provided with a first weir gate (34), one end of the first sewage discharge pipe (17) is communicated with the secondary sedimentation tank (18), and the other end of the first sewage discharge pipe passes through the upper part of the first weir gate (34) and is communicated with the B oxidation ditch (2).
5. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1 or 4, wherein: a oxidation ditch (1) right-hand member is equipped with second weir gate (35), second weir gate (35) with the intercommunication has second blow off pipe (36) between first blow off pipe (17), second blow off pipe (36) one end is followed the upper portion of second weir gate (35) pass and with A oxidation ditch (1) intercommunication, the other end intercommunication is fixed on B oxidation ditch (2) and PAC throw first blow off pipe (17) between throwing guan (19).
6. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: the ratio of the area of an area in which an aeration device is arranged in the oxidation ditch A (1) to the total area of the oxidation ditch A (1) is 2: 3; the ratio of the area of the aeration device arranged in the oxidation ditch B (2) to the total area of the oxidation ditch B (2) is 1: 3.
7. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: and the aeration devices in the oxidation ditch A (1) and the oxidation ditch B (2) are aeration disks (37).
8. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: flow impellers (38) are arranged in the oxidation ditch A (1) and the oxidation ditch B (2), and the flow impellers (38) are electrically connected with the PLC.
9. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: the communication port (4) is formed at the bottom of the isolation wall (3); a hard L-shaped water guide pipe (39) communicated with the communicating port (4) is arranged in the oxidation ditch A (1), the L-shaped water guide pipe (39) is vertically fixed at the bottom of the oxidation ditch A (1), the lower end opening of the L-shaped water guide pipe (39) is communicated with the communicating port (4), and the height of the upper end opening is not less than half of the height of the partition wall (3).
10. The improved biochemical sewage treatment system with the oxidation ditch as claimed in claim 1, wherein: the rate of the anaerobic bacteria selecting pool (8) discharging water into the oxidation ditch A (1) is 2.3-3.1 times of the rate of the anaerobic bacteria selecting pool discharging water into the oxidation ditch B (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN110436628A (en) * | 2019-08-15 | 2019-11-12 | 浙江海牛环境科技股份有限公司 | A kind of improved oxidation ditch biochemical wastewater treatment system |
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