TNT-containing wastewater purification treatment device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a purification treatment device for TNT-containing wastewater. According to the sewage treatment device, a sewage falling point can be prevented from being fixed, TNT powder and other solid particles are effectively prevented from being accumulated at a fixed position, the TNT powder and other solid particles are filtered and intercepted while the sewage passing amount is guaranteed, and the amount of particle impurities such as the TNT powder in sewage is effectively reduced; comprising a sedimentation well, a sedimentation tank, an adjusting tank, a filtering mechanism and a clean water tank, a filtering and impurity removing assembly used for filtering and intercepting TNT powder and other solid particles is installed in the precipitation well, the filtering and impurity removing assembly comprises a filtering disc, a tension spring and a water collecting hopper installed at the bottom of the filtering disc, rotating shafts are fixedly installed in the middles of the two sides of the filtering disc, and the rotating shafts are rotatably installed in the precipitation well; a water inlet pipe is arranged on one side of the precipitation well, and a water outlet pipe is arranged on the other opposite side of the precipitation well.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a purification treatment device for wastewater containing TNT. Background Art

[0002] TNT, chemically known as trinitrotoluene, is a high explosive that is yellow powder or fish scale-like and is difficult to dissolve in water. During the production, assembly, and packaging process, a small amount of TNT powder will fall on the ground. When the floor of the production workshop is cleaned, this powder will enter the workshop sump with the flushing water. In order to ensure that the wastewater meets the discharge standards, this part of the wastewater needs to be collected and properly treated. The water quality after treatment must meet the relevant requirements of the "Water Pollutant Emission Standards for Ordnance Industry Ammunition Charges" (GB14470.3-2011).

[0003] For example, Chinese invention patent CN104310664B discloses a method for treating TNT explosive wastewater and its application, wherein wastewater containing TNT explosive particles is subjected to solid-liquid separation to obtain solid particles and separated wastewater, and then the separated wastewater is subjected to oil separation to obtain oil-separated wastewater after the oil is separated, and the oil-separated wastewater is sent to an aeration regulating tank for homogenization treatment, etc. It provides a new treatment process by improving the treatment process, which has a good treatment effect and good removal efficiency for TNT explosive wastewater.

[0004] However, it was found that the above treatment method still has the following defects: the content of TNT powder and other particulate matter in the sewage is high, which has a great impact on the subsequent sewage treatment equipment; the solid-liquid separation of wastewater containing TNT and other particulate matter through traditional filters can effectively reduce the TNT content in the sewage, but because the filter holes are small, TNT powder and other particulate matter will accumulate and clog the filter holes, affecting the normal passage of sewage, and the filter needs to be cleaned frequently, which has certain limitations in use. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a purification treatment device for TNT-containing wastewater, which avoids the fixed falling point of sewage and effectively prevents the accumulation of TNT powder and other solid particles at a fixed position, ensures the flow rate of sewage, filters and intercepts TNT powder and other solid particles, and effectively reduces the amount of TNT powder and other particulate impurities in sewage.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a purification and treatment device for TNT-containing wastewater, comprising a sedimentation well, a sedimentation tank, a regulating tank, a filtering mechanism and a clear water tank connected in sequence; a filtering and impurity removal component for filtering and intercepting TNT powder and other solid particles is installed in the sedimentation well, the filtering and impurity removal component comprises a filter disc, a tension spring and a water collecting bucket installed at the bottom of the filter disc, a rotating shaft is fixedly installed at the middle of both sides of the filter disc, the rotating shaft is rotatably installed on the sedimentation well, a water inlet pipe is provided on one side of the sedimentation well, a water outlet pipe is provided on the other opposite side of the sedimentation well, an eccentric water collecting chamber close to one side of the water inlet pipe and a drain pipe connected to the eccentric water collecting chamber are provided in the water collecting bucket, an electric control valve is installed at the drain pipe, one end of the tension spring is hinged to the side of the filter disc close to the water outlet pipe, and the other end of the tension spring is hinged to the inner wall of the sedimentation well close to the water outlet pipe. Furthermore, the electric control valve is preferably a solenoid valve, and other equivalent valves with remote control effects can also be used. When there is no water in the eccentric water collecting chamber, under the tension of the tension spring, the filter plate tilts downward near one end of the outlet pipe; the bottom of the filter plate adopts a dense mesh filter or a dense mesh filter cloth, and the filter pore size of the dense mesh filter or the dense mesh filter cloth is smaller than the particle size of the TNT powder to achieve the filtration and retention of powdered TNT; the installation height of the water inlet pipe is at least 10 cm higher than the top of the filter plate in the horizontal state; the installation height of the water outlet pipe is lower than the extreme low position of the bottom of the drain pipe; the central axis of the rotating shaft is arranged perpendicular to the central axes of the water inlet pipe and the water outlet pipe.

[0007] Preferably, a guide rod is installed in the filter disc, a scraper is slidably installed on the guide rod, and scraper teeth are provided at the bottom of the scraper; further, the central axis of the guide rod is arranged perpendicular to the central axis of the rotating shaft.

[0008] Preferably, a counterweight is installed on the scraper; further, the counterweight is detachably installed on the scraper.

[0009] Preferably, the counterweight block is provided with anti-collision strips on both sides of the axial direction of the guide rod; further, the anti-collision strips may be made of rubber, silicone or other equivalent materials with anti-collision and shock-absorbing effects.

[0010] Preferably, the water inlet pipe extends to above the horizontal filter disc.

[0011] Preferably, a mud discharge pipe is provided at the bottom of the side wall of the sedimentation well, and a diversion slope is provided at the bottom of the sedimentation well, and the diversion slope is inclined downward on one side close to the mud discharge pipe.

[0012] Preferably, the filtering mechanism comprises a sand filter tank, a primary activated carbon adsorption tank and a secondary activated carbon adsorption tank which are connected in sequence.

[0013] Preferably, the filtering mechanism also includes a pressure pump, the input end of the pressure pump extends into the clean water tank, and the output end of the pressure pump extends into the regulating tank; further, the pressure pump can be a plurality of groups, and the plurality of groups of pressure pumps serve as backup for each other or are used in parallel, wherein the water output from the output end of at least one pressure pump can be used for production cleaning.

[0014] Compared with the prior art, the utility model provides a purification treatment device for TNT-containing wastewater, which has the following beneficial effects:

[0015] In the purification treatment device for TNT-containing wastewater, in a natural state, under the action of a tension spring, the filter disc tilts toward one side of the water outlet pipe. When sewage flows to the filter disc through the water inlet pipe, due to the small filter holes on the filter disc, the sewage flows in a plane dispersed state at the bottom of the filter disc. The filter disc filters the dispersed TNT powder and other particulate matter, and the filtered sewage enters the eccentric water collection chamber. As the amount of sewage in the eccentric water collection chamber increases, the filter disc gradually tilts toward one side of the water inlet pipe, and the position of the falling point of the sewage discharged from the water inlet pipe changes. The electric control valve is opened, and the eccentric water collection chamber is filled with water. No water is discharged from the filter, and the filter disc is reset under the action of spring tension. During this process, the filter disc swings back and forth, and the TNT powder and other granular impurities filtered and retained in the filter disc flow with the water flow in the filter disc, avoiding TNT powder or other granular impurities from clogging the filter holes on the filter disc, ensuring the smooth passage of sewage, avoiding the fixed sewage landing point, and effectively preventing TNT powder and other solid particles from accumulating in a fixed position. While ensuring the amount of sewage flowing through, TNT powder and other solid particles are filtered and retained, effectively reducing the amount of TNT powder and other granular impurities in sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the sedimentation well of the utility model.

[0017] Figure 2 It is a schematic diagram of the planar structure of the sedimentation well of the utility model when viewed from above.

[0018] Figure 3 The utility model Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0019] Figure 4 It is a schematic diagram of the wastewater treatment process of the utility model.

[0020] Figure 5 The utility model Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0021] Figure 6 It is a schematic diagram of the internal planar structure of a sedimentation well in a waterless state in an eccentric water collection cavity of the utility model.

[0022] Among them: 1. Sedimentation well; 2. Sedimentation tank; 3. Regulating tank; 4. Clear water tank; 5. Filter plate; 6. Tension spring; 7. Water collecting bucket; 8. Rotating shaft; 9. Water inlet pipe; 10. Water outlet pipe; 11. Eccentric water collecting chamber; 12. Drain pipe; 13. Electric control valve; 14. Guide rod; 15. Scraper; 16. Scraping teeth; 17. Counterweight; 18. Anti-collision strip; 19. Mud discharge pipe; 20. Diversion slope; 21. Sand filter tank; 22. Primary activated carbon adsorption tank; 23. Secondary activated carbon adsorption tank; 24. Booster pump. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] Example 1

[0027] Please refer to Figures 1 to 3 A purification and treatment device for wastewater containing TNT, comprising a sedimentation well 1, a sedimentation tank 2, a regulating tank 3, a filtering mechanism and a clear water tank 4 connected in sequence; a filtering and impurity removal component for filtering and intercepting TNT powder and other solid particles is installed in the sedimentation well 1, and the filtering and impurity removal component comprises a filter plate 5, a tension spring 6 and a water collecting bucket 7 installed at the bottom of the filter plate 5, a rotating shaft 8 is fixedly installed at the middle of both sides of the filter plate 5, and the rotating shaft 8 is rotatably installed on the sedimentation well 1, a water inlet pipe 9 is provided on one side of the sedimentation well 1, and a water outlet pipe 10 is provided on the other opposite side of the sedimentation well 1, an eccentric water collecting chamber 11 close to one side of the water inlet pipe 9 and a drainage pipe 12 connected to the eccentric water collecting chamber 11 are provided in the water collecting bucket 7, and an electric control valve 13 is installed at the drainage pipe 12, one end of the tension spring 6 is hinged to the side of the filter plate 5 close to the water outlet pipe 10, and the other end of the tension spring 6 is hinged to the inner wall of the sedimentation well 1 close to the water outlet pipe 10.

[0028] Furthermore, the electric control valve 13 is preferably a solenoid valve, and other equivalent valves with remote control effects can also be used. When there is no water in the eccentric water collecting chamber 11, under the tension of the tension spring 6, the filter disc 5 tilts downward near the end of the outlet pipe 10; a dense mesh filter screen or a dense mesh filter cloth is used at the bottom of the filter disc 5, and the filter pore size of the dense mesh filter screen or the dense mesh filter cloth is smaller than the particle size of the TNT powder to achieve the filtration and retention of powdered TNT; the installation height of the water inlet pipe 9 is at least 10 cm higher than the top of the filter disc 5 in the horizontal state; the installation height of the outlet pipe 10 is lower than the extreme low position of the bottom of the drain pipe 12; the central axis of the rotating shaft 8 is arranged perpendicular to the central axes of the water inlet pipe 9 and the outlet pipe 10.

[0029] Please refer to Figure 3 , the water inlet pipe 9 extends to the top of the filter disc 5 in the horizontal state. A mud discharge pipe 19 is provided at the bottom of the side wall of the sedimentation well 1, and a diversion slope 20 is provided at the bottom of the sedimentation well 1. The diversion slope 20 is tilted downward on the side close to the mud discharge pipe 19. When the filter disc 5 is tilted at one end close to the water inlet pipe 9, the water inlet pipe 9 can limit the filter disc 5 to prevent the filter disc 5 from rotating excessively due to inertia and causing the filtered material in the filter disc 5 to spill; under the action of the inclined diversion slope 20, the sludge generated by the sedimentation in the sedimentation well 1 flows to the mud discharge pipe 19 under the action of gravity, which is convenient for the subsequent cleaning of the sludge at the bottom of the sedimentation well 1.

[0030] Please refer to Figure 4 The filtering mechanism includes a sand filter tank 21, a primary activated carbon adsorption tank 22 and a secondary activated carbon adsorption tank 23 which are connected in sequence; the filtering mechanism also includes a pressure pump 24, the input end of the pressure pump 24 extends into the clean water tank 4, and the output end of the pressure pump 24 extends into the regulating tank 3; further, the pressure pump 24 can be a plurality of groups, and the plurality of groups of pressure pumps 24 can serve as backup for each other or be used in parallel, and the water output from the output end of at least one pressure pump 24 can be used for production cleaning.

[0031] In the purification treatment device for TNT-containing wastewater provided in this embodiment, the wastewater after preliminary filtration treatment is fully settled in the sedimentation tank 2, and the smaller particles of the wastewater are also removed, and then enters the regulating tank 3 to temporarily store the wastewater, adjust the water volume and water quality of the wastewater, and ensure the stable operation of the subsequent treatment device. The wastewater in the regulating tank 3 enters the sand filter tank 21 through the lifting pump, which can effectively remove the suspended matter, colloid, and large particle impurities in the raw water, reduce the turbidity, and further ensure the removal of suspended matter and colloid substances in the comprehensive wastewater. The sand filter tank 21 uses quartz sand filter material inside, which has a large pollution interception capacity. In order to ensure the filtering effect, the equipment adopts a large resistance water distribution system, which has uniform water distribution and good water output effect. When the sand filter tank 21 runs for a certain period of time or when the pressure difference between its inlet and outlet water reaches a certain value, the sand filter tank 21 is backwashed; the sand filter tank 21 is backwashed by water, and the system backwash water uses the clean water stored in the clean water tank 4. The pressure pump 24 is used to supply water for the backwash of the sand filter tank 21, and the impurities adhering to the surface of the filter material are dispersed and peeled off, and then taken away with water to improve the backwash effect of the sand filter tank 21. Then the wastewater enters the primary activated carbon adsorption tank 22 and the secondary activated carbon adsorption tank 23 in turn. The primary activated carbon adsorption tank 22 and the secondary activated carbon adsorption tank 23 are filled with wood granular activated carbon fillers, which can adsorb and remove pollutants in the wastewater. The activated carbon needs to be replaced regularly. In this way, further purification of the sewage is achieved. After purification, part of the sewage in the clean water tank 4 is supplied to the workshop for cleaning through the pressure pump 24, and part is injected into the regulating tank 3. The water volume and water quality in the regulating tank 3 are adjusted by clean water, and the purified water is fully utilized.

[0032] Example 2

[0033] The purification treatment device for TNT-containing wastewater provided in Example 1 is further optimized. For details, please refer to Figure 3 and Figure 5 A guide rod 14 is installed in the filter disc 5, a scraper 15 is slidably installed on the guide rod 14, and a scraper tooth 16 is provided at the bottom of the scraper 15; further, the central axis of the guide rod 14 is arranged perpendicular to the central axis of the rotating shaft 8.

[0034] A counterweight 17 is mounted on the scraper 15 ; further, the counterweight 17 can be detachably mounted on the scraper 15 .

[0035] Anti-collision strips 18 are installed on both sides of the counterweight block 17 along the axial direction of the guide rod 14; further, the anti-collision strips 18 can be made of rubber, silicone or other equivalent materials with anti-collision and shock-absorbing effects.

[0036] In the purification treatment device for TNT-containing wastewater provided in the present embodiment, during the reciprocating swinging process of the filter disc 5, the scraper 15 reciprocates along the guide rod 14, and the scraper teeth 16 can disperse and scrape the filtered material attached to the bottom of the filter disc 5 to prevent TNT powder from agglomerating and clogging the filter holes on the filter disc 5, thereby ensuring the sewage passing through the filter disc 5; the counterweight block 17 can increase the inertial force of the scraper 15 sliding along the guide rod 14, thereby increasing the scraping amount of the filtered material by the scraper 15; the anti-collision strip 18 can reduce the amount of noise generated when the counterweight block 17 contacts the inner wall of the filter disc 5, thereby achieving a good anti-collision protection effect on the counterweight block 17 and the filter disc 5.

[0037] See also Figure 6 The use process of the purification treatment device for TNT-containing wastewater provided by the utility model is as follows: in a natural state, under the action of the tension spring 6, the filter disc 5 tilts toward the side of the outlet pipe 10. When the sewage flows to the filter disc 5 through the inlet pipe 9, due to the small filter holes on the filter disc 5, the sewage flows in a plane dispersed state at the bottom of the filter disc 5. The filter disc 5 filters the dispersed TNT powder and other particulate matter, and the filtered sewage enters the eccentric water collecting chamber 11. As the amount of sewage in the eccentric water collecting chamber 11 increases, the filter disc 5 gradually tilts toward the side of the inlet pipe 9, and the position of the falling point of the sewage discharged from the inlet pipe 9 changes. The electric control valve 13 is opened, and no water is discharged from the eccentric water collecting chamber 11. The filter disc 5 is reset under the action of the spring tension. During this process, the filter disc 5 swings back and forth, and the TNT powder and other granular impurities filtered and retained in the filter disc 5 flow with the water flow in the filter disc 5. Finally, the TNT powder and other granular impurities gather on both sides of the filter disc 5, and the filter holes in the middle of the filter disc 5 are in a smooth state.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A purification treatment device for TNT-containing wastewater, comprising a sedimentation well (1), a sedimentation tank (2), a regulating tank (3), a filtration mechanism and a clear water tank (4) which are connected in sequence; characterized in that: A filtering and impurity removal component for filtering and intercepting TNT powder and other solid particles is installed in the sedimentation well (1), and the filtering and impurity removal component comprises a filter disc (5), a tension spring (6), and a water collecting bucket (7) installed at the bottom of the filter disc (5). A rotating shaft (8) is fixedly installed in the middle of both sides of the filter disc (5), and the rotating shaft (8) is rotatably installed on the sedimentation well (1). A water inlet pipe (9) is provided on one side of the sedimentation well (1), and a water outlet pipe (10) is provided on the other opposite side of the sedimentation well (1). An eccentric water collecting chamber (11) close to the side of the water inlet pipe (9) and a drainage pipe (12) connected to the eccentric water collecting chamber (11) are provided in the water collecting bucket (7), and an electric control valve (13) is installed at the drainage pipe (12). One end of the tension spring (6) is hinged to the side of the filter disc (5) close to the water outlet pipe (10), and the other end of the tension spring (6) is hinged to the inner wall of the sedimentation well (1) close to the water outlet pipe (10).

2. The purification treatment device for TNT-containing wastewater according to claim 1, characterized in that: A guide rod (14) is installed in the filter plate (5), a scraper (15) is slidably installed on the guide rod (14), and scraper teeth (16) are provided at the bottom of the scraper (15).

3. The purification device for TNT-containing wastewater according to claim 2, characterized in that: A counterweight (17) is mounted on the scraper (15).

4. The purification device for TNT-containing wastewater according to claim 3, characterized in that: Anti-collision strips (18) are installed on both sides of the counterweight block (17) along the axial direction of the guide rod (14).

5. The purification device for TNT-containing wastewater according to claim 1, characterized in that: The water inlet pipe (9) extends above the horizontal filter disc (5).

6. The purification device for TNT-containing wastewater according to claim 5, characterized in that: A mud discharge pipe (19) is provided at the bottom of the side wall of the sedimentation well (1), and a diversion slope (20) is provided at the bottom of the sedimentation well (1). The diversion slope (20) is arranged to be inclined downward on a side close to the mud discharge pipe (19).

7. The purification treatment device for TNT-containing wastewater according to claim 1, characterized in that: The filtering mechanism comprises a sand filter tank (21), a primary activated carbon adsorption tank (22) and a secondary activated carbon adsorption tank (23) which are connected in sequence.

8. The purification device for TNT-containing wastewater according to claim 7, characterized in that: The filtering mechanism further comprises a pressure pump (24), the input end of the pressure pump (24) extending into the clean water tank (4), and the output end of the pressure pump (24) extending into the regulating tank (3).

Images