CN214654545U - Device for producing slow-release fertilizer by utilizing waste water resource - Google Patents
Device for producing slow-release fertilizer by utilizing waste water resource Download PDFInfo
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- CN214654545U CN214654545U CN202120385727.1U CN202120385727U CN214654545U CN 214654545 U CN214654545 U CN 214654545U CN 202120385727 U CN202120385727 U CN 202120385727U CN 214654545 U CN214654545 U CN 214654545U
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Abstract
The utility model belongs to the technical field of waste water resource and agricultural non-point source pollution source control, a device of waste water resource utilization production slowly-releasing is fertile is disclosed. The utility model comprises a fluidized bed reactor and a sample introduction system, wherein the fluidized bed reactor is internally provided with a settling zone, a transition zone and a fluidized reaction zone with gradually reduced openings from top to bottom, and the lower part of the fluidized reaction zone is provided with a sample introduction mechanism for inputting wastewater, saline solution and alkaline solution into the fluidized reaction zone through the sample introduction mechanism; the fluidization reaction zone is also provided with a backflow water inlet pipe positioned below the sample feeding mechanism, and the backflow water inlet pipe is communicated with the upper part of the settling zone through a backflow pump. The utility model discloses make up to standard guano stone granule and guano stone granule autosegregation not up to standard, keep continuous and stable operation under the impact of backward flow water moreover, the collection of the product that convenient follow-up as the fertile use of slowly-releasing.
Description
Technical Field
The utility model belongs to the technical field of waste water resource and agricultural non-point source pollution source control, concretely relates to device of waste water resource utilization production slowly-releasing fertilizer.
Background
The quick-acting fertilizer applied in the farmland is easy to run off along with water, and nitrogen and phosphorus nutrient salts carried in farmland runoff become main pollution sources of eutrophication of most lakes. The slow release fertilizer is used for replacing a quick-acting fertilizer, the fertilizer loss proportion is reduced, the concentration of nitrogen and phosphorus nutrient salts in farmland runoff is reduced, and the method is an effective way for controlling farmland runoff pollution and lake eutrophication from the source, but the price of the slow release fertilizer is higher at present, and the use enthusiasm of farmers is not high.
The waste water anaerobic digestion liquid of food production plants such as activated sludge anaerobic digestion liquid of sewage treatment plants, dairy products and the like contains high-concentration phosphate and ammonia nitrogen, and by adding a salt solution and an alkali solution, phosphate ions and ammonium ions in the waste water and metal ions in the salt solution are subjected to a reverse precipitation reaction under an alkaline condition, so that a slow release fertilizer capable of being absorbed and utilized by plants can be generated. The slow release fertilizer is produced by using the waste water as a raw material, so that the cost can be obviously reduced.
In the process of producing the slow release fertilizer, a fluidized bed reactor is needed, but how to realize automatic, continuous and stable operation of the fluidized bed reactor is a technical problem to be solved.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide a device for producing slow release fertilizer by utilizing waste water resources.
The utility model discloses the technical scheme who adopts does:
a device for producing slow release fertilizer by resource utilization of wastewater comprises a fluidized bed reactor and a sample introduction system, wherein a settling zone, a transition zone and a fluidized reaction zone are sequentially arranged in the fluidized bed reactor from top to bottom, the openings of the settling zone, the transition zone and the fluidized reaction zone are gradually reduced, and a sample introduction mechanism is arranged at the lower part of the fluidized reaction zone and used for inputting wastewater, a salt solution and an alkali solution into the fluidized reaction zone through the sample introduction mechanism; the fluidization reaction zone is also provided with a backflow water inlet pipe positioned below the sample feeding mechanism, and the backflow water inlet pipe is communicated with the upper part of the settling zone through a backflow pump.
What further inject is, the sampling mechanism includes that waste water advances appearance pipe, salt solution advances appearance pipe and alkali solution advances appearance pipe, and the waste water advances appearance pipe is connected with waste water reservoir bucket through first liquid pump, and the salt solution advances appearance pipe is connected with salt solution reservoir bucket through the second liquid pump, and the alkali solution advances the appearance pipe and is connected with the alkali solution bottle through the third liquid pump.
More particularly, the slow release fertilizer manufacturing device further comprises a programmable logic controller (9), and the programmable logic controller is electrically connected with the third liquid pump.
More particularly, the programmable logic controller is electrically connected with a pH meter, and a pH electrode of the pH meter is arranged in the precipitation zone.
It is still further limited that a product collecting box is arranged below the fluidized bed reactor, an inlet of the product collecting box is communicated with the fluidized bed reactor through a first valve, and an outlet of the product collecting box is provided with a second valve.
It is still further defined that the lower end of the settling zone and the lower end of the transition zone are both of inverted cone structure.
More particularly, the backflow water inlet pipe and the fluidized bed reactor are arranged in an inclined upward direction at an angle of 30-60 degrees.
The inlet end of the circulating liquid inlet pipe penetrates through the outer wall of the fluidized bed reactor and is arranged in the settling zone; the inlet of the circulating liquid inlet pipe is provided with a filter screen which is of an arc-shaped structure with the middle part protruding towards the direction far away from the inlet end of the circulating liquid inlet pipe.
More particularly, the sedimentation zone is internally provided with an air bag, and the inlet end of the circulating liquid inlet pipe penetrates from the upper part of the air bag to the lower part of the air bag.
Further limited, the middle part of the air bag is provided with a threaded hole, and the inlet end of the circulating liquid inlet pipe is fixed with a mounting ring which is in threaded connection with the threaded hole.
The utility model has the advantages that:
the utility model discloses it has the salt solution to pour into in fluidized bed reactor, alkali solution and sewage treatment plant, the waste water of food production factory etc, with the granule footpath struvite granule inter reaction of adding in the fluidized bed reactor, generate the big particle diameter that can be used to the slow-release fertilizer to use, high strength spherical struvite granule, in the in-process of production, utilize the cooperation of backwash pump and backward flow inlet tube, the supernatant that will subside district upper strata is imported fluidized bed reactor from backward flow inlet tube by the backwash pump, in order to provide the updraft, make the granule footpath struvite granule that does not reach standard suspend in the fluidized reaction zone, wait for newly-generated struvite crystal to adhere to growth to certain particle diameter at granule footpath struvite granule surface and wait to be collected to the fluidized reaction zone, and then make up to standard struvite granule and substandate granule autosegregation, and keep continuous and stable operation under the impact of backward flow, the collection of subsequent products used as slow release fertilizers is facilitated; from the use angle, the utility model discloses the large grain size, the spherical struvite granule of high strength that produce are the optimal product shape, have the packing of being convenient for and transport the convenience, can directly use, and nutrient element release rate is low and be difficult for advantages such as loss.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fourth embodiment of the present invention.
In the figure: 1-a fluidized bed reactor; 101-a precipitation zone; 102-a transition zone; 103-a fluidized reaction zone; 104-return water inlet pipe; 105-a wastewater sample inlet pipe; 106-saline solution sampling tube; 107-alkali solution sampling tube; 2-a reflux pump; 201-circulating a liquid inlet pipe; 202-an air bag; 3-a first liquid pump; 4-a wastewater storage barrel; 5-a second liquid pump; 6-saline solution storage barrel; 7-a third liquid pump; 8-alkaline solution bottle; 9-a programmable logic controller; 10-pH meter; 1001-pH electrode; 11-a product collection box; 12-a first valve; 13-a second valve; 14-computer.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the accompanying drawings is only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without any inventive work.
The technical solution provided by the present invention will be described in detail by way of embodiments with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
In some instances, some embodiments are not described or not in detail, as they are conventional or customary in the art.
Furthermore, the technical features described herein, or the steps of all methods or processes disclosed, may be combined in any suitable manner in one or more embodiments, in addition to the mutually exclusive features and/or steps. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Any order in the drawings and examples is for illustrative purposes only and does not imply that a certain order is required unless explicitly stated to be required.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The terms "connected" and "coupled" when used in this application, encompass both direct and indirect connections (and couplings) where appropriate and where not necessary contradictory.
The first embodiment is as follows:
as shown in FIG. 1, the embodiment provides a device for producing slow release fertilizer by resource utilization of wastewater, which comprises a fluidized bed reactor 1 and a sample introduction system, wherein the device comprises a first feeding device and a second feeding deviceA settling zone 101, a transition zone 102 and a fluidized reaction zone 103 with gradually reduced openings are sequentially arranged in the fluidized bed reactor 1 from top to bottom, and a sample injection mechanism is arranged at the lower part of the fluidized reaction zone 103 and used for inputting wastewater, a salt solution and an alkali solution into the fluidized reaction zone 103 through the sample injection mechanism; the fluidized reaction zone 103 is further provided with a return water inlet pipe 104 positioned below the sample feeding mechanism, and the return water inlet pipe 104 is communicated with the upper part of the settling zone 101 through a return pump 2. In this embodiment, the salt solution is preferably MgCl2The solution, preferably the aqueous alkali, is NaOH solution, as a specific component for reacting with the wastewater to produce the slow release fertilizer, which is specifically struvite particles in this embodiment, and therefore, struvite is taken as an example for explanation hereinafter. It is noted that in practice the settling zone 101 of the fluidized bed reactor 1 is provided with water outlets.
The working principle is as follows: before the fluidized bed reactor 1 is started, firstly ensuring that the reflux pump 2 and the sampling mechanism are in a closed state, filling wastewater in the fluidized bed reactor 1, starting the reflux pump, adding small-particle-size struvite particles serving as seed crystals from the top end of the fluidized bed reactor 1, wherein the seed crystals can be suspended in the fluidized reaction zone 103; opening the sample injection mechanism, and collecting the wastewater and the salt solution (MgCl)2Solution) and an alkali solution (NaOH solution) flow into the fluidized reaction zone 103 through a sample injection mechanism, phosphate ions, ammonium ions and magnesium ions in the wastewater are subjected to precipitation reaction under an alkaline condition to generate struvite crystals MgNH serving as a slow release fertilizer4PO4·6H2O, because the small-particle-size struvite particles added in advance exist in the reaction zone of the fluidized bed, newly generated struvite crystals are attached to the surfaces of the small-particle-size struvite particles to grow, so that the particle size of the seed crystals is continuously increased; the diameter of the settling zone 101 at the top end of the fluidized bed reactor 1 is far larger than that of the fluidized reaction zone 103, so that the ascending flow velocity in the settling zone 101 is small, and the small-particle-size struvite particles entering the settling zone 101 are settled at a small flow velocity and are retained in the fluidized bed reactor; the supernatant formed in the upper part of the settling zone 101 is fed by the reflux pump 2 from the reflux water inlet pipe 104 into the fluidized bed reactor 1 to provide an ascending flow to enable the struvite particles to be suspended in the fluidized reaction zone.
During the above operation, the transition zone 102 is located between the fluidized reaction zone 103 and the settling zone 101, and its main functions are: 1. receiving the small-particle-size struvite particles from the settling zone 101, enabling the struvite particles to grow in the transition zone 102, and automatically descending to the fluidized reaction zone 103 to supplement seed crystals after the struvite particles reach a certain particle size; 2. the ascending flow speed is slowed down, and the disturbance of the ascending water flow to the settling zone 101 is relieved.
It is further illustrated in this embodiment that the sample injection mechanism includes a wastewater sample injection pipe 105, a saline solution sample injection pipe 106, and an alkaline solution sample injection pipe 107, the wastewater sample injection pipe 105 is connected to a wastewater reservoir tank 4 through a first liquid pump 3, the amount and time of wastewater injected into the fluidized bed reactor 1 are controlled by the first liquid pump 3, the saline solution sample injection pipe 106 is connected to a saline solution reservoir tank 6 through a second liquid pump 5, the amount and time of saline solution injected into the fluidized bed reactor 1 are controlled by the second liquid pump 5, the alkaline solution sample injection pipe 107 is connected to an alkaline solution bottle 8 through a third liquid pump 7, and the amount and time of alkaline solution injected into the fluidized bed reactor 1 are controlled by the third liquid pump 7. Preferably, check valves are disposed between the first liquid pump 3 and the wastewater sampling pipe 105, between the second liquid pump 5 and the saline solution sampling pipe 106, and between the third liquid pump 7 and the alkaline solution sampling pipe 107, so as to prevent the solution in the fluidized reaction zone 103 from flowing backwards.
It is further described in this embodiment that the slow release fertilizer manufacturing apparatus further includes a programmable logic controller 9, the programmable logic controller 9 is electrically connected to the third liquid pump 7, and further corresponding control over the third liquid pump 7 in the working process is achieved, it should be noted that, in practice, the programmable logic controller 9 may be connected to an intelligent terminal such as a computer 14 or a mobile phone, so as to facilitate monitoring of each data, and meanwhile, facilitate remote control through the intelligent terminal such as the computer 14 or the mobile phone, and improve convenience.
More specifically, the programmable logic controller 9 is electrically connected to a pH meter 10, a pH electrode 1001 of the pH meter 10 is disposed in the sedimentation zone 101, and is in contact with the supernatant of the sedimentation zone 101 to measure the pH value of the supernatant, in practice, the pH meter 10 is connected to the programmable logic controller 9 through a computer 14, the computer 14 performs real-time monitoring and control of pushing of data or instructions, and then the programmable logic controller 9 controls the start and stop of each pump.
Through the pH meter, pH data is transmitted into the computer, data recording is completed, the data is transmitted into the programmable logic controller, and the opening and closing of the third liquid pump 7 are controlled through the programmable logic controller. Before the fluidized bed reactor is started, inputting a preset pH value into computer software, and when the measured pH value of the supernatant is less than the preset pH value, turning on a third liquid pump 7 to pump a salt solution into the fluidized bed reactor 1; when the pH of the supernatant is equal to or greater than the preset pH, the third liquid pump 7 is turned off, and pumping of the salt solution into the fluidized bed reactor 1 is stopped. The supernatant pH was maintained at the preset pH by a pH control system.
In this embodiment, it is further explained that a product collection box 11 is disposed below the fluidized bed reactor 1, an inlet of the product collection box 11 is communicated with the fluidized bed reactor 1 through a first valve 12, the first valve 12 can be disposed at an inlet of the product collection box 11 or disposed at an outlet of the fluidized bed reactor 1 for controlling the collection of the product, and an outlet of the product collection box 11 is provided with a second valve 13 for controlling the discharge of the product particles collected in the product collection box 11.
It should be noted that, in practical application, a water injection valve and an exhaust valve are arranged at an inlet of the product collection box 11, after the fluidized bed reactor 1 starts to operate, the first valve 12 and the second valve 13 are firstly ensured to be in a closed state, water discharged from the fluidized bed reactor 1 with a certain volume is collected, the water injection valve and the exhaust valve are opened, and the product collection box 11 is completely filled with the collected water. Closing the water injection valve and the exhaust valve, and opening the first valve 12 to communicate the product collection box 11 with the fluidized bed reactor 1; when the particles in the fluidized reaction zone 103 are enlarged to be unable to suspend in the fluidized reaction zone 103, the particles can automatically settle into the product collection box 11; or when the particles in the fluidized bed reactor 1 need to be collected, the reflux rate is reduced by adjusting the reflux pump, the ascending flow velocity in the fluidized reaction zone 103 is reduced, the particles are settled in the product collection box 11, after a certain amount of product particles are collected, the ascending flow velocity is increased again, so that the particles in the fluidized bed reactor 1 can not be settled in the product collection box 11, the first valve 12 is closed, the exhaust valve and the second valve 13 are opened, the product particles in the product collection box 11 and water are discharged onto the stainless steel sieve together, the water flows away, the particles are intercepted on the stainless steel sieve, and the final product collection is completed.
This product collecting box 11 can utilize the ascending rivers that backwash pump 2 provided when collecting the product to make product collecting box 11 do not influence fluidized bed reactor 1 operation when collecting the product, need not close the advantage that fluidized bed reactor 1 just can collect the product.
Example two:
the present embodiment is a further improvement on the basis of the first embodiment, and specific differences between the present embodiment and the first embodiment are as follows:
it is further illustrated in this embodiment that the lower end of the settling zone 101 and the lower end of the transition zone 102 are both inverted cone-shaped structures. The lower end of the settling zone 101 is of an inverted cone structure, so that small-particle-size struvite particles settled in the settling zone can slide down to enter a lower transition zone and grow into new seed crystal particles in the transition zone; the lower end of the transition region 102 is of an inverted cone structure, so that a dead water region can be prevented from appearing, struvite particles are accumulated in the dead water region and are easy to agglomerate, and the movement of the particles and water flow in the fluidized bed reactor 1 is blocked.
Example three:
the present embodiment is a further improvement on the basis of the first embodiment or the second embodiment, and the specific differences between the present embodiment and the first embodiment or the second embodiment are:
it is further illustrated in this embodiment that the return water inlet pipe 104 is inclined upward at an angle of 30-60 ° with respect to the fluidized bed reactor 1, so that the return water flowing out from the return water inlet pipe 104 has an upward impact force to reduce the head loss of the return water, ensure the rising flow rate, and enable the struvite particles to stably suspend in the fluidized reaction zone 103. It should be noted that the angle between the return water inlet pipe 104 and the reactor may be 30 °, 45 °, 60 °, or the like, and is not limited specifically, and may be selected according to the actual water velocity and size of the return water, and meanwhile, it should be further noted that the inclination of the angle of 30-60 ° is only a preferable mode of the embodiment, and in practice, the angle between the return water inlet pipe 104 and the fluidized bed reactor 1 may also be larger than this range, and may be set according to the actual situation.
Example four:
the present embodiment is a further improvement made on the basis of any one of the first to third embodiments, and the specific differences between the present embodiment and any one of the first to third embodiments are as follows:
further illustrated in this embodiment, as shown in fig. 2, an inlet end of the reflux pump 2 is connected to a circulating liquid inlet pipe 201, and an inlet end of the circulating liquid inlet pipe 201 passes through an outer wall of the fluidized bed reactor 1 and is disposed in the settling zone 101 for extracting a supernatant at a top end of the settling zone 101; the import of circulation feed liquor pipe 201 is provided with the filter screen, and the filter screen is the arc structure of middle part to the protruding setting of direction of keeping away from circulation feed liquor pipe 201 entrance point, can avoid backwash pump 2's suction too big like this, inhales the granule footpath guano stone granule in the sedimentation zone 101 to the circulation feed liquor pipe 201 in cause the jam. It should be further noted that, in this embodiment, the inlet direction of the circulating liquid inlet pipe 201 may be set upward or downward, in practical operation, the water level is controlled, and on the basis of ensuring the water level, the inlet of the circulating liquid inlet pipe 201 is preferably set upward in this embodiment.
Example five:
the present embodiment is a further improvement on the basis of the fourth embodiment, and specific differences between the present embodiment and the fourth embodiment are:
it is further described in this embodiment that, when the inlet of the circulating liquid inlet pipe 201 is disposed downward, the air bag 202 is disposed in the settling zone 101, during actual operation, the air bag 202 floats on the supernatant in the settling zone 101, and the inlet end of the circulating liquid inlet pipe 201 penetrates from the upper side of the air bag 202 to the lower side of the air bag 202, more precisely from the upper side of the air bag 202 to the supernatant below the air bag 202, so that the inlet end of the circulating liquid inlet pipe 201 is provided with a floating structure, which can change position with the change of the amount of liquid in the settling zone 101, and further extract the liquid at a certain position away from the supernatant water surface as required, thereby ensuring the stability when extracting the supernatant.
Example six:
the present embodiment is a further improvement made on the basis of the fifth embodiment, and the specific differences between the present embodiment and the fifth embodiment are:
in this embodiment, it is further described that a threaded hole is formed in the middle of the air bag 202, a mounting ring is fixed to the inlet end of the circulating liquid inlet pipe 201, and the mounting ring is in threaded connection with the threaded hole, so that the air bag 202 and the circulating liquid inlet pipe 201 can be conveniently assembled and disassembled, and the air bag can be conveniently stored. It should be noted that the mounting ring may be a common collar fixed at the inlet end of the circulating liquid inlet pipe 201, or may be a bearing, an inner ring of the bearing is fixedly connected to the circulating liquid inlet pipe 201, an outer ring of the bearing is relatively longer, and then an external thread is provided on the outer ring, so that the threaded connection in the threaded hole of the air bag 202 is convenient for matching, and further the air bag 202 and the circulating liquid inlet pipe 201 can rotate relatively, thereby preventing the circulating liquid inlet pipe 201 from being pressed by the movement of the air bag 202 and affecting the flow of the circulating liquid inlet pipe 201.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a device of fertile of waste water resource utilization production slowly-releasing which characterized in that: the device comprises a fluidized bed reactor (1) and a sample feeding system, wherein a settling zone (101), a transition zone (102) and a fluidized reaction zone (103) with gradually reduced openings are sequentially arranged in the fluidized bed reactor (1) from top to bottom, and a sample feeding mechanism is arranged at the lower part of the fluidized reaction zone (103); the fluidization reaction zone (103) is also provided with a backflow water inlet pipe (104) positioned below the sample feeding mechanism, and the backflow water inlet pipe (104) is communicated with the upper part of the settling zone (101) through a backflow pump (2).
2. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 1, which is characterized in that: the sampling mechanism comprises a wastewater sampling pipe (105), a saline solution sampling pipe (106) and an alkaline solution sampling pipe (107), wherein the wastewater sampling pipe (105) is connected with a wastewater storage barrel (4) through a first liquid pump (3), the saline solution sampling pipe (106) is connected with a saline solution storage barrel (6) through a second liquid pump (5), and the alkaline solution sampling pipe (107) is connected with an alkaline solution bottle (8) through a third liquid pump (7).
3. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 2, characterized in that: the slow release fertilizer manufacturing device also comprises a programmable logic controller (9), and the programmable logic controller (9) is electrically connected with the third liquid pump (7).
4. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 3, characterized in that: the programmable logic controller (9) is electrically connected with a pH meter (10), and a pH electrode (1001) of the pH meter (10) is arranged in the precipitation zone (101).
5. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 1, which is characterized in that: a product collecting box (11) is arranged below the fluidized bed reactor (1), an inlet of the product collecting box (11) is communicated with the fluidized bed reactor (1) through a first valve (12), and an outlet of the product collecting box (11) is provided with a second valve (13).
6. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 1, which is characterized in that: the lower end of the settling zone (101) and the lower end of the transition zone (102) are both in inverted cone structures.
7. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 1, which is characterized in that: the backflow water inlet pipe (104) and the fluidized bed reactor (1) are arranged in an inclined upward manner at an angle of 30-60 degrees.
8. The device for producing the slow release fertilizer by resource utilization of the wastewater according to any one of claims 1 to 7, characterized in that: the inlet end of the reflux pump (2) is connected with a circulating liquid inlet pipe (201), and the inlet end of the circulating liquid inlet pipe (201) penetrates through the outer wall of the fluidized bed reactor (1) and then is arranged in the settling zone (101); the inlet of the circulating liquid inlet pipe (201) is provided with a filter screen which is of an arc-shaped structure with the middle part convexly arranged in the direction far away from the inlet end of the circulating liquid inlet pipe (201).
9. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 8, characterized in that: an air bag (202) is arranged in the settling zone (101), and the inlet end of the circulating liquid inlet pipe (201) penetrates from the upper part of the air bag (202) to the lower part of the air bag (202).
10. The device for producing the slow release fertilizer by resource utilization of the wastewater as claimed in claim 9, characterized in that: the middle part of the air bag (202) is provided with a threaded hole, the inlet end of the circulating liquid inlet pipe (201) is fixed with a mounting ring, and the mounting ring is in threaded connection with the threaded hole.
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| CN202120385727.1U CN214654545U (en) | 2021-02-20 | 2021-02-20 | Device for producing slow-release fertilizer by utilizing waste water resource |
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| CN202120385727.1U CN214654545U (en) | 2021-02-20 | 2021-02-20 | Device for producing slow-release fertilizer by utilizing waste water resource |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114893354A (en) * | 2022-05-09 | 2022-08-12 | 中国环境科学研究院 | Monitoring device with collecting and cleaning functions for wind field area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114893354A (en) * | 2022-05-09 | 2022-08-12 | 中国环境科学研究院 | Monitoring device with collecting and cleaning functions for wind field area |
| CN114893354B (en) * | 2022-05-09 | 2024-04-12 | 中国环境科学研究院 | Monitoring device with collection and cleaning functions for wind power field |
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