CN113735317A - Special efficient wastewater treatment system for extracting N-methyl pyrrolidone - Google Patents
Special efficient wastewater treatment system for extracting N-methyl pyrrolidone Download PDFInfo
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- CN113735317A CN113735317A CN202111056426.5A CN202111056426A CN113735317A CN 113735317 A CN113735317 A CN 113735317A CN 202111056426 A CN202111056426 A CN 202111056426A CN 113735317 A CN113735317 A CN 113735317A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The invention relates to a special efficient wastewater treatment system for extracting N-methylpyrrolidone, which comprises a pretreatment system and a filtration system, wherein the pretreatment system comprises a wastewater collection tank, an acid-base regulation tank, a coagulating sedimentation tank and a solid-liquid separator which are sequentially connected, the filtration system sequentially comprises a coarse filter and a fine filter, the inlet end of the coarse filter is connected with the solid-liquid separator, and the outlet end of the fine filter is connected with an NMP recovery system. The coagulating sedimentation tank and the solid-liquid separator are matched to effectively filter impurities such as floccules in the wastewater, so that the sedimentation process steps are reduced, the filtering effect is improved, and the workload of a subsequent filtering system is reduced.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a special efficient wastewater treatment system for extracting N-methylpyrrolidone.
Background
A small amount of waste water is discharged in the production process of the lithium battery, particularly in the positive and negative electrode pulping process in the production process of the lithium battery, a water source is mostly used for the production waste water of a positive electrode pulp mixing barrel and a coating machine, the waste water contains a large amount of organic solvents such as N-methylpyrrolidone (NMP) and the like, and the NMP is a polar aprotic solvent with strong selectivity and good stability, and has the advantages of low toxicity, high boiling point, strong dissolving power, nonflammability, biodegradability, recyclability, safe use, suitability for various formula purposes and the like. The existing traditional anaerobic and aerobic biochemical treatment method has large occupied area and high input cost, and NMP (methyl pyrrolidone) organic matters have very poor biodegradability and are not easy to biodegrade after being discovered by a small test; in addition, most of the existing wastewater treatment systems decompose and treat organic matters and suspended matters in wastewater, and NMP in the wastewater cannot be recycled, so that energy waste is caused. If the NMP is recovered, the NMP must be separated and refined, and the ultra-high purity product of the NMP, namely the NMP is more than or equal to 99.99wt percent, can be reused.
The mode of getting rid of the suspended solid among the current waste water pretreatment of systems only relies on the mode of sediment to handle, and the mode of sediment exists that water velocity is slow, and the problem that purification efficiency is low needs multichannel process to carry out the precipitation treatment to separation effect generally, can have a small amount of tiny impurity to enter the next filtration process along with the rivers, causes the jam easily, thereby increases filtration system's work load, influences filtration quality.
Disclosure of Invention
Aiming at the problems, the invention discloses a special efficient wastewater treatment system for extracting N-methylpyrrolidone, and solves the problems that impurities cannot be effectively separated from wastewater and the separation efficiency is low in the conventional wastewater pretreatment system.
The specific technical scheme is as follows:
a special efficient wastewater treatment system for extracting N-methylpyrrolidone comprises a pretreatment system and a filtration system, wherein the pretreatment system comprises a wastewater collection tank, an acid-base regulation tank, a coagulating sedimentation tank and a solid-liquid separator which are sequentially connected, the filtration system sequentially comprises a coarse filter and a fine filter, the inlet end of the coarse filter is connected with the solid-liquid separator, and the outlet end of the fine filter is connected with an NMP recovery system;
the solid-liquid separator comprises an outer barrel, a separating barrel, a sieving barrel, a driving motor, a suction pump and a washing circulating device, wherein a blow-off pipe is arranged at the bottom of the outer barrel, the separating barrel and the sieving barrel are respectively arranged at the upper end and the lower end of an inner cavity of the outer barrel, the separating barrel comprises an upper barrel and a lower barrel, the diameter of the upper barrel is smaller than that of the lower barrel, the upper barrel is of a structure with a wide upper part and a narrow lower part, a cover plate is horizontally arranged at the top of the upper barrel, the edge of the cover plate is fixedly connected with the inner wall of the outer barrel, a water suction pipe penetrates through the middle part of the cover plate and is connected with the water inlet end of the suction pump, and the water outlet end of the suction pump is connected with the coarse-effect filter through a water drain pipe; the lower barrel top is arranged horizontally, the lower barrel top is provided with a water inlet pipe, one end of the water inlet pipe penetrates through the outer barrel and is connected with an outlet end of a coagulating sedimentation tank, the bottom of the lower barrel is provided with a plurality of drain holes, the center of the bottom of the lower barrel penetrates through a rotating shaft, the top end of the rotating shaft is positioned in the lower barrel and is provided with a stirring impeller, the bottom end of the rotating shaft is driven by a driving motor arranged at the bottom of the outer barrel, the lower end of the rotating shaft is fixedly arranged on the sieving barrel, a sieving screen is arranged on the side wall of the sieving barrel, an upper end sleeve of the sieving barrel is arranged on the outer wall of the lower barrel and is rotationally connected with the outer wall of the lower barrel through a bearing, the side wall of the lower end of the sieving barrel inclines inwards, the bottom end of the sieving barrel is arranged horizontally, stirring blades are arranged on the inner wall of the bottom of the sieving barrel, an electromagnetic cover opening device is arranged on one side of the bottom of the sieving barrel, and comprises a trash discharge port, a sealing cover, and a sealing cover, The bottom of the outer barrel is fixedly arranged on the inner wall of the bottom of the outer barrel and positioned right below the sieving barrel, the upper surface of the electromagnet is positioned right below the magnet block, and after the electromagnet is electrified, the magnetic pole on the upper surface of the electromagnet is the same as the magnetic pole on the lower surface of the magnet block, so that the magnet block and the electromagnet repel each other and drive the sealing cover to ascend, and the impurity discharging port is opened and closed; the washing circulating device is used for conveying the filtered water in the outer cylinder body to the separating cylinder again for solid-liquid separation, and an external water source can be used for washing the screen to remove impurities.
Furthermore, the flushing circulation device comprises a conveying pipe, a bidirectional water pump, an electromagnetic three-way valve and a spray pipe, wherein the electromagnetic three-way valve and the bidirectional water pump are arranged on the conveying pipe, one end of the electromagnetic three-way valve is connected with a tap water pipe end, one end of the conveying pipe penetrates through the side wall of the upper end of the outer cylinder and is connected with one side of the top of the lower cylinder, the other end of the conveying pipe penetrates through the side wall of the lower end of the outer cylinder and is connected with the spray pipe, the spray pipe is longitudinally arranged on one side of the sieving cylinder, a plurality of spray heads are longitudinally arranged on one side of the spray pipe close to the sieving screen, the upper end of the spray pipe is in a closed arrangement, a water suction port is formed in the lower end of the spray pipe, an elastic switch cover is arranged at the water suction port, a sealing plug for closing the water suction port is arranged at the bottom of the elastic switch cover, one end of the elastic switch cover is hinged with the inner wall of the lower end of the spray pipe, a connecting seat is arranged at the top of the elastic switch cover, and is connected with a spring, the other end of the spring is connected with the inner side wall of the spray suction pipe, so that the elastic switch cover seals the water suction port under the supporting action of the spring.
Furthermore, the edge of the top end of the lower barrel is provided with a circle of partition plate, the edge of the partition plate is fixedly connected with the inner wall of the outer barrel, and the upper end and the lower end of the inner cavity of the outer barrel are partitioned.
Furthermore, the coagulating sedimentation tank comprises a tank body, wherein a reaction tank, a sedimentation tank and a clarification tank are sequentially arranged in the tank body along the water flow direction, a water inlet pipe and a dosing pipe are arranged at one end of the reaction tank, a mixing stirrer is arranged in the reaction tank, a water outlet pipe is arranged at one end of the clarification tank, first partition plates are respectively arranged between the reaction tank and the sedimentation tank and between the sedimentation tank and the clarification tank, first circulation ports are respectively formed in the upper ends of the first partition plates, a plurality of first filter plates are longitudinally arranged on one side of each first partition plate close to the water inlet pipe, and the first filter plates are all arranged in a downward inclination manner; the lower end of the precipitation tank is provided with two collecting hoppers, the bottoms of the two collecting hoppers are respectively provided with a sludge discharge pipe, the bottoms of the two sludge discharge pipes are horizontally connected with a sludge conveying pipe, a second partition plate is arranged between the two collecting hoppers, the lower end of the second partition plate is provided with a second circulation port, one side of the second partition plate, which is close to the reaction tank, is provided with a movable filter plate assembly, the movable filter plate assembly comprises a plurality of second filter plates, a servo motor, a rack and a hinge seat, the rack is longitudinally arranged on the second partition plate, a chute is formed in one side surface of the second partition plate, the rack is slidably arranged in the chute, the upper end of the rack extends to the top end of the box body and is driven by the servo motor matched with a gear to realize lifting, the servo motor is arranged at the top end of the box body, the hinge seats are in a plurality of groups and are longitudinally arranged on one side surface of the second partition plate, and the hinge seats in each group are two and are respectively positioned at two sides of the second partition plate, set up between two articulated seats the second filter, the second filter sets up for the tilt up, and the lower one end in second filter position is equipped with articulated post, the both ends of articulated post are articulated with two articulated seats, and articulated post surface is equipped with a plurality of tooth pieces along circumference, tooth piece on every articulated post all with rack toothing connects, realizes that servo motor drives the rack through the drive gear and goes up and down in the spout to it rotates to drive the second filter.
Furthermore, a spiral auger is arranged in the mud conveying pipe, and one end of the mud conveying pipe is provided with a conveying motor for driving the spiral auger.
Furthermore, all be equipped with the filter screen on first filter and the second filter.
Furthermore, guide grooves are formed in two sides of the rack, and guide strips matched with the guide grooves are formed in the side walls of two sides of the sliding groove, so that the sliding groove can limit the rack.
Further, two are no less than to the quantity of the rack on the second baffle, just fixedly connected with pivot on servo motor's the output, the pivot level is rotated and is set up on the box top, sets up a plurality of gears that are used for being connected with the rack toothing in the pivot.
Furthermore, a sludge conveying pipe of the coagulating sedimentation tank and a blow-off pipe of the solid-liquid separator are respectively connected with the sludge sedimentation tank through a conveying pump, and the outlet end of the sludge sedimentation tank is connected with the plate-type filter press through the conveying pump.
The invention has the beneficial effects that:
the invention is adopted.
(1) The invention adopts the coagulation sedimentation tank and the solid-liquid separator to cooperate to effectively filter impurities such as floccules and the like in the wastewater, thereby reducing the steps of the sedimentation process, simultaneously improving the filtering effect and reducing the workload of the subsequent filtering system.
(2) According to the invention, the solid-liquid separator firstly performs high-speed rotation stirring on liquid in the separation barrel through the stirring impeller to enable the liquid to form a spiral shape, impurities and clear liquid are layered up and down under the centrifugal action, so that the clear liquid in the upper barrel is sucked through the water suction pipe matched with the suction pump, turbid liquid containing a large amount of impurities in the lower barrel flows into the sieving barrel through the drain hole under the action of gravity, and then the impurities are effectively filtered after secondary centrifugal sieving through the sieving barrel, so that the solid-liquid separation effect is greatly improved.
(3) According to the washing and circulating device, the water filtered in the outer barrel body is conveyed into the separating barrel again through the matched spraying and sucking pipe of the bidirectional pump, so that secondary solid-liquid separation is performed, circulation is performed, the filtering and impurity removing effects are further improved, meanwhile, when the screen cloth of the screen barrel is cleaned, tap water enters the spraying and sucking pipe through the water conveying pipe under the action of the electromagnetic three-way valve, the water suction opening is sealed through the elastic switch cover under the supporting action of the spring, the spraying and sucking pipe performs back washing on the screen cloth through the plurality of spray heads, the two-in-one washing and circulating is achieved, and the practicability is high.
(4) The sieve tube bottom is equipped with the electromagnetism device of uncapping to when washing the screen cloth, through for the electro-magnet circular telegram, electro-magnet upper surface magnetic pole is the same with magnet piece lower surface magnetic pole, makes magnet piece and electro-magnet repel each other and drives sealed lid and rise, realizes the switching to arranging miscellaneous mouthful, thereby makes the impurity in the sieve tube can follow row miscellaneous mouthful outflow, novel structure, and the practicality is high.
(5) According to the invention, the first partition plate and the second partition plate respectively block and filter impurities and floccules flowing in the sedimentation tank through the first filter plate and the second filter plate, so that the impurities are prevented from flowing to an outlet along with water flow, and the sedimentation effect of the sedimentation tank on the impurities is improved.
(6) According to the invention, the second filter plate is turned over through the movable filter plate component on the second partition plate, so that when more impurities are blocked on the second filter plate, the impurities fall into the settling tank through automatic turning, and the function of periodic cleaning is realized.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
FIG. 2 is a schematic view showing the structure of a solid-liquid separator according to the present invention.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
FIG. 4 is a schematic structural view of the spray pipe of the present invention.
FIG. 5 is a schematic structural view of a coagulation sedimentation tank according to the present invention.
FIG. 6 is a side sectional view of the coagulation sedimentation tank of the present invention.
Fig. 7 is an enlarged view of B in fig. 5.
Fig. 8 is a schematic view of a connection structure between the rack and the chute according to the present invention.
A waste water collecting tank 1 and an acid-base adjusting tank 2;
the coagulating sedimentation tank 3, a box body 31, a water inlet pipe 311, a water outlet pipe 312, a reaction tank 32, a mixing stirrer 321, a chemical feeding pipe 322, a sedimentation tank 33, a collecting hopper 331, a sludge discharging pipe 332, a sludge conveying pipe 333, a spiral auger 334, a conveying motor 335, a clarifying tank 34, a first clapboard 35, a first circulation port 351, a first filter plate 352, a filter screen 353, a second clapboard 36, a second circulation port 361, a second filter plate 362, a hinged column 3621, a tooth block 3622, a servo motor 363, a rotating shaft 3631, a gear 3632, a rack 364, a guide groove 3641, a hinged seat 365, a sliding groove 366, a guide strip 3661, a water outlet pipe 312, a reaction tank 32, a mixing stirrer 321, a chemical feeding pipe 322, a sedimentation tank 33, a collecting hopper 331, a sludge discharging pipe 332, a sludge conveying pipes 333, a spiral auger 334, a conveying motors 335, a gear 3621, a rack 364, a guide groove 3641, a guide groove 365, a guide bar,
The device comprises a solid-liquid separator 4, an outer cylinder 41, a sewage discharge pipe 411, a water inlet pipe 412, a separation cylinder 42, an upper cylinder 421, a lower cylinder 422, a water discharge hole 4221, a separation plate 4222, a cover plate 423, a sieving cylinder 43, a sieving net 431, a stirring paddle 432, an electromagnetic cover opening device 433, a trash discharge port 4331, a support seat 4332, a sealing cover 4333, a sealing gasket 4334, a guide rod 4335, a limiting plate 4336, a magnet 4337, an electromagnet 4338, a driving motor 44, a rotating shaft 441, a stirring impeller 442, a suction pump 45, a water suction pipe 451, a water discharge pipe 452, a flushing circulation device 46, a conveying pipe 461, a two-way water pump 462, an electromagnetic three-way valve 463, a spray suction pipe 464, a water suction port 4641, an elastic switch cover 4642, a 4643, a connecting seat 4644, a spring 4645 and a nozzle sealing plug 465;
a coarse filter 5, a fine filter 6, an NMP recovery system 7, a sludge sedimentation tank 8 and a plate filter press 9.
Detailed Description
In order to make the technical scheme of the invention clearer and clearer, the invention is further described with reference to the accompanying drawings, and any scheme obtained by carrying out equivalent replacement and conventional reasoning on the technical characteristics of the technical scheme of the invention falls into the protection scope of the invention. The fixing and the arrangement of the fixing and the connection are all general connection modes in the mechanical field, and the fixing and the connection can be performed by welding, bolt and nut connection and screw connection.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, a special efficient wastewater treatment system for extracting N-methylpyrrolidone comprises a pretreatment system and a filtration system, wherein the pretreatment system comprises a wastewater collection tank 1, an acid-base regulation tank 2, a coagulating sedimentation tank 3 and a solid-liquid separator 4 which are connected in sequence, the filtration system comprises a coarse filter 5 and a fine filter 6 in sequence, the inlet end of the coarse filter 5 is connected with the solid-liquid separator 4, and the outlet end of the fine filter 6 is connected with an NMP recovery system 7;
as shown in fig. 2-4, the solid-liquid separator 4 includes an outer cylinder 41, a separating cylinder 42, a sieving cylinder 43, a driving motor 44, a suction pump 45, and a washing circulation device 46, a drain pipe 411 is disposed at the bottom of the outer cylinder 41, the separating cylinder 42 and the sieving cylinder 43 are disposed at the upper end and the lower end of the inner cavity of the outer cylinder 41, respectively, the separating cylinder 42 includes an upper cylinder 421 and a lower cylinder 422, the diameter of the upper cylinder 421 is smaller than that of the lower cylinder 422, the upper cylinder 421 has a structure with a wide upper part and a narrow lower part, a cover plate 423 is horizontally disposed at the top of the upper cylinder 421, the edge of the cover plate 423 is fixedly connected with the inner wall of the outer cylinder 41, a water suction pipe 451 is disposed at the middle part of the cover plate 423 in a penetrating manner, the water suction pipe 451 penetrates the top end of the outer cylinder 41 and is connected with the water inlet end of the suction pump 45, and the water outlet end of the suction pump 45 is connected with the coarse filter 5 through a water outlet pipe 452; the top of the lower cylinder 422 is horizontally arranged, the top of the lower cylinder 422 is provided with a water inlet pipe 412, one end of the water inlet pipe 412 penetrates through the outer cylinder 41 and is connected with the outlet end of the coagulating sedimentation tank 3, the bottom of the lower cylinder 422 is provided with a plurality of water discharge holes 4221, a rotating shaft 441 penetrates through the center of the bottom of the lower cylinder 422, the top end of the rotating shaft 441 is positioned in the lower cylinder 422 and is provided with a stirring impeller 442, the bottom end of the rotating shaft 441 is driven by a driving motor 44 arranged at the bottom of the outer cylinder 41, the lower end of the rotating shaft 441 is fixedly provided with the sieving cylinder 43, the side wall of the sieving cylinder 43 is provided with a circle of sieving screen 431, the upper end of the sieving cylinder 43 is sleeved on the outer wall of the lower cylinder 422 and is rotationally connected with the outer wall of the lower cylinder 422 through a bearing, the side wall of the lower end of the sieving cylinder 43 inclines inwards, the bottom end of the sieving cylinder 43 is horizontally arranged, the inner wall of the bottom end of the sieving cylinder 43 is provided with stirring blades 432, and one side of the bottom of the sieving cylinder 43 is provided with an electromagnetic cover opening device 433;
the electromagnetic uncapping device 433 comprises an impurity discharge port 4331, a sealing cover 4333, a magnet block 4337 and an electromagnet 4338, wherein a stepped supporting seat 4332 is arranged on the inner wall of the impurity discharge port 4331, the sealing cover 4333 is arranged on the supporting seat 4332, a guide rod 4335 is vertically arranged on the periphery of the bottom of the sealing cover 4333, the lower end of the guide rod 4335 penetrates through the supporting seat 4332 and is provided with a limiting plate 4336, a ring of sealing gasket 4334 is arranged at the bottom of the sealing cover 4333, the magnet block 4337 is fixedly arranged at the center of the bottom of the sealing cover 4333, the electromagnet 4338 is of an annular structure, the electromagnet 4338 is fixedly arranged on the inner wall of the bottom end of the outer cylinder 41 and is positioned right below the sieving cylinder 43, a waterproof film is sleeved outside the electromagnet 4338 to avoid direct contact with water in actual use, the upper surface of the electromagnet 4338 is positioned right below the magnet block 4337, and after the electromagnet 4338 is electrified, the upper surface of the electromagnet 4338 has the same magnetic pole as the lower surface of the 4337, so that the electromagnet 4337 repels the electromagnet 4338 and drives the sealing cover 4333 to rise, the opening and closing of the impurity discharging port 4331 are realized; the flushing circulation device 46 is used for re-conveying the filtered water in the outer cylinder 41 to the separation cylinder 42 for solid-liquid separation, and the screen 431 can be flushed by an external water source to remove impurities.
Further, the flushing circulation device 46 includes a delivery pipe 461, a two-way water pump 462, an electromagnetic three-way valve 463 and a spray-suction pipe 464, the delivery pipe 461 is provided with the electromagnetic three-way valve 463 and the two-way water pump 462, one end of the electromagnetic three-way valve 463 is connected with the end of the tap water pipe, one end of the delivery pipe 461 penetrates through the upper end side wall of the outer cylinder 41 and is connected with one side of the top of the lower cylinder 422, the other end of the delivery pipe 461 penetrates through the lower end side wall of the outer cylinder 41 and is connected with the spray-suction pipe 464, the spray-suction pipe 464 is longitudinally arranged on one side of the sieving cylinder 43, and one side of the spray-suction pipe 464 close to the sieving mesh 431 is longitudinally provided with a plurality of spray heads 465, the size of the spray heads 465 is smaller, the upper end of the spray-suction pipe 464 is closed, the lower end of the spray-suction pipe 464 is provided with a water suction port 4641, the water suction position is provided with an elastic switch cover 4642, the bottom of the elastic switch cover 4642 is provided with a sealing plug 4643 for closing the water suction port 4641, one end of the elastic switch cover 4642 is hinged to the inner wall of the lower end of the spray-suction pipe 464, a connecting seat 4644 is arranged at the top of the elastic switch cover 4642, a spring 4645 is connected to the connecting seat 4644, and the other end of the spring 4645 is connected to the inner wall of the spray-suction pipe 464, so that the elastic switch cover 4642 seals the water suction port 4641 under the supporting action of the spring 4645, and when the bidirectional water pump 462 performs suction, the elastic switch cover 4642 is turned over upwards and compresses the spring 4645 under the action of suction force due to the small aperture size of the spray head 465.
Further, the edge of the top end of the lower cylinder 422 is provided with a circle of partition plate 4222, the edge of the partition plate 4222 is fixedly connected with the inner wall of the outer cylinder 41, so that the upper end and the lower end of the inner cavity of the outer cylinder 41 are separated.
As shown in fig. 5-8, the coagulation sedimentation tank 3 includes a tank 31, a reaction tank 32, a sedimentation tank 33 and a clarification tank 34 are sequentially arranged in the tank 31 along a water flow direction, a water inlet pipe 311 and a chemical feeding pipe 322 are arranged at one end of the reaction tank 32, a mixing stirrer 321 is arranged in the reaction tank 32, a water outlet pipe 312 is arranged at one end of the clarification tank 34, first partition plates 35 are respectively arranged between the reaction tank 32 and the sedimentation tank 33 and between the sedimentation tank 33 and the clarification tank 34, first circulation ports 351 are respectively arranged at the upper ends of the first partition plates 35, a plurality of first filter plates 352 are longitudinally arranged at one sides of the first partition plates 35 close to the water inlet pipe 311, and the first filter plates 352 are all arranged in a downward inclination manner; the lower end of the settling tank 33 is provided with two collecting hoppers 331, the bottoms of the two collecting hoppers 331 are respectively provided with a sludge discharge pipe 332, the bottoms of the two sludge discharge pipes 332 are horizontally connected with a sludge conveying pipe 333, a second partition plate 36 is arranged between the two collecting hoppers 331, the lower end of the second partition plate 36 is provided with a second circulation port 361, one side of the second partition plate 36 close to the reaction tank 32 is provided with a movable filter plate assembly, the movable filter plate assembly comprises a plurality of second filter plates 362, a servo motor 363, a rack 364 and a hinge seat 365, the rack 364 is longitudinally arranged on the second partition plate 36 and provided with a sliding groove 366 on one side surface of the second partition plate 36, the rack 364 is slidably arranged in the sliding groove 366, the upper end of the rack 364 extends to the top end of the box body 31 and is driven by the servo motor 363 in cooperation with a gear 3632 to realize lifting, the servo motor 363 is installed at the top end of the box body 31, the hinge seats 365 are in multiple groups and are longitudinally arranged on one side surface of the second partition plate 36, and each group of hinged seats 365 is two and is respectively positioned at two sides of the second partition plate 36, the second filter plate 362 is arranged between the two hinged seats 365, the second filter plate 362 is arranged in an upward inclined manner, the lower end of the second filter plate 362 is provided with a hinged column 3621, two ends of the hinged column 3621 are hinged to the two hinged seats 365, the surface of the hinged column 3621 is provided with a plurality of tooth blocks 3622 along the circumferential direction, the tooth blocks 3622 on each hinged column 3621 are all meshed with the rack 364, and the servo motor 363 drives the rack 364 to ascend and descend in the sliding groove 366 through the driving gear 3632, so that the second filter plate 362 is driven to rotate.
Further, a spiral auger 334 is arranged in the mud conveying pipe 333, and a conveying motor 335 for driving the spiral auger 334 is arranged at one end of the mud conveying pipe 333.
Further, a filter screen 353 is disposed on each of the first filter plate 352 and the second filter plate 362.
Furthermore, guide grooves 3641 are formed in two sides of the rack 364, and guide strips 3661 matched with the guide grooves 3641 are formed in side walls of two sides of the sliding groove 366, so that the sliding groove 366 limits the rack 364.
Further, the number of the racks 364 on the second partition plate 36 is not less than two, and the output end of the servo motor 363 is fixedly connected with a rotating shaft 3631, the rotating shaft 3631 is horizontally and rotatably arranged at the top end of the box 31, and the rotating shaft 3631 is provided with a plurality of gears 3632 engaged with the racks 364.
Further, a sludge conveying pipe 333 of the coagulation sedimentation tank 3 and a sewage discharge pipe 411 of the solid-liquid separator 4 are respectively connected with the sludge sedimentation tank 8 through a conveying pump, and the outlet end of the sludge sedimentation tank 8 is connected with the plate filter press 9 through the conveying pump.
The working principle is as follows: the solid-liquid separator 4 firstly rotates and stirs the liquid in the separation cylinder 42 at a high speed through the stirring impeller 442 to enable the liquid to form a spiral shape, impurities and clear liquid are layered up and down under the centrifugal action, the clear liquid in the upper cylinder 421 is sucked through the water suction pipe 451 in cooperation with the suction pump 45, the turbid liquid containing a large amount of impurities in the lower cylinder 422 flows into the sieving cylinder 43 through the water discharge hole 4221 under the action of gravity, and then the impurities are effectively filtered after secondary centrifugal sieving through the sieving cylinder 43; the flushing circulation device 46 absorbs water through a spraying pipe 464 matched with a bidirectional pump, so that the elastic switch cover 4642 is turned upwards under the action of suction force and compresses the spring 4645, filtered water in the outer cylinder 41 is sucked and is conveyed into the separation cylinder 42 again, secondary solid-liquid separation is realized, circulation is performed, the filtering and impurity removing effects are further improved, meanwhile, when a sieving net 431 of the sieving cylinder 43 is cleaned, tap water enters the spraying pipe 464 through a water pipe through the action of the electromagnetic three-way valve 463, the elastic switch cover 4642 seals the water suction port 4641 under the supporting action of the spring 4645, and the spraying pipe 464 performs back flushing on the sieving net 431 through the plurality of spray heads 465; the impurities washed fall into the bottom end of the sieving cylinder 43, and then the electromagnet 4338 is electrified, so that the magnetic pole of the upper surface of the electromagnet 4338 is the same as the magnetic pole of the lower surface of the magnet block 4337, the magnet block 4337 and the electromagnet 4338 repel each other and drive the sealing cover 4333 to ascend and descend, the impurity discharge port 4331 is opened and closed, and the impurities in the sieving cylinder 43 can flow out from the impurity discharge port 4331.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A special efficient wastewater treatment system for extracting N-methylpyrrolidone comprises a pretreatment system and a filtration system, wherein the pretreatment system comprises a wastewater collection tank (1), an acid-base regulation tank (2), a coagulating sedimentation tank (3) and a solid-liquid separator (4) which are sequentially connected, the filtration system sequentially comprises a coarse filter (5) and a fine filter (6), the inlet end of the coarse filter (5) is connected with the solid-liquid separator (4), and the outlet end of the fine filter (6) is connected with an NMP recovery system (7);
the device is characterized in that the solid-liquid separator (4) comprises an outer cylinder body (41), a separating cylinder (42), a sieving cylinder (43), a driving motor (44), a suction pump (45) and a washing circulating device (46), wherein a sewage discharge pipe (411) is arranged at the bottom of the outer cylinder body (41), the separating cylinder (42) and the sieving cylinder (43) are respectively arranged at the upper end and the lower end of the inner cavity of the outer cylinder body (41), the separating cylinder (42) comprises an upper cylinder body (421) and a lower cylinder body (422), the diameter of the upper cylinder body (421) is smaller than that of the lower cylinder body (422), the upper cylinder body (421) is of a structure with a wide upper part and a narrow lower part, a cover plate (423) is horizontally arranged at the top of the upper cylinder body (421), the edge of the cover plate (423) is fixedly connected with the inner wall of the outer cylinder body (41), a water suction pipe (451) penetrates through the top end of the outer cylinder body (41) and is connected with the water inlet end of the suction pump (45), the water outlet end of the suction pump (45) is connected with the coarse filter (5) through a water discharge pipe (452); the top of the lower cylinder body (422) is horizontally arranged, the top of the lower cylinder body (422) is provided with a water inlet pipe (412), one end of the water inlet pipe (412) penetrates through the outer cylinder body (41) and is connected with the outlet end of the coagulating sedimentation tank (3), the bottom of the lower cylinder body (422) is provided with a plurality of drain holes (4221), the center of the bottom of the lower cylinder body (422) is provided with a rotating shaft (441) in a penetrating manner, the top end of the rotating shaft (441) is positioned in the lower cylinder body (422) and is provided with a stirring impeller (442), the bottom end of the rotating shaft (441) is driven by a driving motor (44) arranged at the bottom of the outer cylinder body (41), the lower end of the rotating shaft (441) is fixedly provided with the sieving cylinder (43), the side wall of the sieving cylinder (43) is provided with a sieving screen (431), the upper end of the sieving cylinder (43) is sleeved on the outer wall of the lower cylinder body (422) and is rotatably connected with the outer wall of the lower cylinder body (422) through a bearing, the lower end side wall of the sieving cylinder (43) is inclined, the bottom end of the sieving cylinder (43) is horizontally arranged, the inner wall of the bottom end of the sieving cylinder (43) is provided with stirring blades (432), one side of the bottom of the sieving cylinder (43) is provided with an electromagnetic cover opening device (433), the electromagnetic cover opening device (433) comprises a trash discharging port (4331), a sealing cover (4333), a magnet block (4337) and an electromagnet (4338), the inner wall of the trash discharging port (4331) is provided with a step-shaped supporting seat (4332), the supporting seat (4332) is provided with the sealing cover (4333), the periphery of the bottom of the sealing cover (4333) is vertically provided with a guide rod (4335), the lower end of the guide rod (4335) penetrates through the supporting seat (4332) and is provided with a limiting plate (4336), the center of the bottom of the sealing cover (4333) is provided with the magnet block (4337), the electromagnet (4338) is of an annular structure, the electromagnet (4338) is fixedly arranged on the inner wall of the bottom end of the outer cylinder body (41) and is positioned right below the sieving cylinder (43), the upper surface of the electromagnet (4338) is positioned right below the magnet block (4337), and after the electromagnet (4338) is electrified, the magnetic pole on the upper surface of the electromagnet (4338) is the same as the magnetic pole on the lower surface of the magnet block (4337), so that the magnet block (4337) and the electromagnet (4338) repel each other and drive the sealing cover (4333) to ascend, and the opening and closing of the impurity discharge port (4331) are realized.
2. The special high-efficiency wastewater treatment system for extracting N-methylpyrrolidone according to claim 1, wherein said flushing circulation device (46) comprises a delivery pipe (461), a two-way water pump (462), an electromagnetic three-way valve (463) and a spraying and sucking pipe (464), said electromagnetic three-way valve (463) and said two-way water pump (462) are arranged on said delivery pipe (461), one end of said electromagnetic three-way valve (463) is connected with the end of the tap water pipe, one end of said delivery pipe (461) is through the side wall of the upper end of the outer cylinder (41) and is connected with one side of the top of the lower cylinder (422), the other end of said delivery pipe (461) is through the side wall of the lower end of the outer cylinder (41) and is connected with said spraying and sucking pipe (464), said spraying and sucking pipe (464) is longitudinally arranged on one side of the sieving cylinder (43), and one side of said spraying and sucking pipe (464) close to the sieving screen (431) is longitudinally arranged with a plurality of spray nozzles (465), the upper end of the spraying pipe (464) is arranged in a closed mode, a water suction port (4641) is formed in the lower end of the spraying pipe (464), an elastic switch cover (4642) is arranged at the water suction position, a sealing plug (4643) used for sealing the water suction port (4641) is arranged at the bottom of the elastic switch cover (4642), one end of the elastic switch cover (4642) is hinged to the inner wall of the lower end of the spraying pipe (464), a connecting seat (4644) is arranged at the top of the elastic switch cover (4642), a spring (4645) is connected onto the connecting seat (4644), the other end of the spring (4645) is connected with the inner side wall of the spraying pipe (464), and the water suction port (4641) is sealed under the supporting effect of the spring (4645) by the elastic switch cover (4642).
3. The special efficient wastewater treatment system for extracting N-methylpyrrolidone according to claim 1, wherein a circle of partition plate (4222) is arranged at the edge of the top end of the lower cylinder (422), the edge of the partition plate (4222) is fixedly connected with the inner wall of the outer cylinder (41), and the upper end and the lower end of the inner cavity of the outer cylinder (41) are separated.
4. The special high-efficiency wastewater treatment system for extracting N-methylpyrrolidone according to claim 1, wherein said coagulating sedimentation tank (3) comprises a tank body (31), said tank body (31) is provided with a reaction tank (32), a sedimentation tank (33) and a clarification tank (34) in sequence along the water flow direction, one end of said reaction tank (32) is provided with a water inlet pipe (311) and a drug feeding pipe (322), said reaction tank (32) is provided with a mixing stirrer (321), one end of said clarification tank (34) is provided with a water outlet pipe (312), a first partition plate (35) is respectively arranged between said reaction tank (32) and said sedimentation tank (33) and between said sedimentation tank (33) and said clarification tank (34), said first partition plate (35) is provided with a first through hole (351) at the upper end, and a plurality of first filter plates (352) are longitudinally arranged on the side of said first partition plate (35) close to said water inlet pipe (311), the first filter plates (352) are all arranged in a downward inclined mode; the lower end of the settling tank (33) is provided with two collecting hoppers (331), the bottoms of the two collecting hoppers (331) are respectively provided with a sludge discharge pipe (332), the bottoms of the two sludge discharge pipes (332) are horizontally connected with a sludge conveying pipe (333), a second partition plate (36) is arranged between the two collecting hoppers (331), the lower end of the second partition plate (36) is provided with a second circulation port (361), one side of the second partition plate (36) close to the reaction tank (32) is provided with a movable filter plate assembly, the movable filter plate assembly comprises a plurality of second filter plates (362), a servo motor (363), a rack (364) and a hinge seat (365), the rack (364) is longitudinally arranged on the second partition plate (36) and provided with a sliding groove (366) on one side surface of the second partition plate (36), the rack (364) is arranged in the sliding groove (366) in a sliding manner, the upper end of the rack (364) extends to the top end of the box body (31) and is driven by the servo motor (363) matching with a gear (3632), the lifting is realized, the servo motor (363) is installed at the top end of the box body (31), the number of the hinge seats (365) is multiple groups, the hinge seats are longitudinally arranged on one side surface of the second partition plate (36), each group of the hinge seats (365) is two and are respectively located on two sides of the second partition plate (36), the second filter plate (362) is arranged between the two hinge seats (365), the second filter plate (362) is arranged in an upward inclined manner, the lower end of the second filter plate (362) is provided with a hinge column (3621), two ends of the hinge column (3621) are hinged with the two hinge seats (365), the surface of the hinge column (3621) is provided with a plurality of tooth blocks (3622) along the circumferential direction, the tooth blocks (3622) on each hinge column (3621) are meshed and connected with the rack (364), the servo motor (363) drives the rack (364) to lift in the sliding groove (366) through the driving gear (3632), thereby rotating the second filter plate (362).
5. The special efficient wastewater treatment system for extracting N-methylpyrrolidone according to claim 4, wherein a spiral auger (334) is arranged in the sludge conveying pipe (333), and a conveying motor (335) for driving the spiral auger (334) is arranged at one end of the sludge conveying pipe (333).
6. The special high-efficiency wastewater treatment system for extracting N-methylpyrrolidone according to claim 4, wherein the first filter plate (352) and the second filter plate (362) are provided with filter screens (353).
7. The special efficient wastewater treatment system for extracting N-methylpyrrolidone according to claim 4, wherein guide grooves (3641) are formed in two sides of the rack (364), and guide strips (3661) matched with the guide grooves (3641) are formed in side walls of two sides of the sliding groove (366), so that the rack (364) is limited by the sliding groove (366).
8. The special efficient wastewater treatment system for extracting N-methylpyrrolidone according to claim 7, wherein the number of racks (364) on said second partition plate (36) is not less than two, and the output end of said servo motor (363) is fixedly connected with a rotating shaft (3631), said rotating shaft (3631) is horizontally and rotatably disposed on the top end of said box body (31), and said rotating shaft (3631) is provided with a plurality of gears (3632) engaged with said racks (364).
9. The special efficient wastewater treatment system for extracting N-methylpyrrolidone according to claim 4, wherein a sludge conveying pipe (333) of the coagulation sedimentation tank (3) and a sewage discharge pipe (411) of the solid-liquid separator (4) are respectively connected with the sludge sedimentation tank (8) through a conveying pump, and the outlet end of the sludge sedimentation tank (8) is connected with the plate filter press (9) through the conveying pump.
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| CN202111056426.5A CN113735317B (en) | 2021-09-09 | 2021-09-09 | Special efficient wastewater treatment system for extracting N-methyl pyrrolidone |
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| CN202111056426.5A CN113735317B (en) | 2021-09-09 | 2021-09-09 | Special efficient wastewater treatment system for extracting N-methyl pyrrolidone |
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| CN113735317B CN113735317B (en) | 2023-03-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114870575A (en) * | 2022-04-20 | 2022-08-09 | 镇江新纳环保材料有限公司 | NMP recycling system applied to battery slurry |
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| JPH11253712A (en) * | 1998-03-09 | 1999-09-21 | Hitachi Ltd | Apparatus for separation by suction of solid and liquid for water tank |
| CN108675568A (en) * | 2018-07-13 | 2018-10-19 | 苏州爱源环境工程技术服务有限公司 | A kind of Lithium Battery Industry waste water purification system |
| CN208980475U (en) * | 2018-09-19 | 2019-06-14 | 赣州中能实业有限公司 | A kind of wastewater treatment equipment of the production of lithium battery containing N-Methyl pyrrolidone |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11253712A (en) * | 1998-03-09 | 1999-09-21 | Hitachi Ltd | Apparatus for separation by suction of solid and liquid for water tank |
| CN108675568A (en) * | 2018-07-13 | 2018-10-19 | 苏州爱源环境工程技术服务有限公司 | A kind of Lithium Battery Industry waste water purification system |
| CN208980475U (en) * | 2018-09-19 | 2019-06-14 | 赣州中能实业有限公司 | A kind of wastewater treatment equipment of the production of lithium battery containing N-Methyl pyrrolidone |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114870575A (en) * | 2022-04-20 | 2022-08-09 | 镇江新纳环保材料有限公司 | NMP recycling system applied to battery slurry |
| CN114870575B (en) * | 2022-04-20 | 2023-08-29 | 镇江新纳环保材料有限公司 | NMP recycling system applied to battery slurry |
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