CN113023994B - Chemical wastewater treatment and recycling device - Google Patents

Abstract

The invention relates to a chemical wastewater treatment and recycling device which is characterized by comprising an evaporation kettle, a water diversion unit and a wastewater treatment unit which are sequentially connected, wherein the water diversion unit comprises a water diversion device, and a movable organic matter recovery device is arranged in the water diversion device and is used for recovering organic matters in the water diversion device; the wastewater treatment unit comprises an electrocatalytic treatment device in the water separator and a secondary treatment device outside the water separator; the water outlet pipeline of the wastewater treatment unit is connected in parallel with the first water distribution pipe of the evaporation kettle, the second water distribution pipe of the water distribution unit and the water inlet pipe of the secondary treatment device, and the treated water outlet is respectively used for wastewater salt crystallization and/or recrystallization and purification treatment, electrocatalytic filler flushing and wastewater treatment filler regeneration in the evaporation kettle.

Description

Chemical wastewater treatment and recycling device

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to a chemical wastewater treatment and recycling device.

Background

Chemical industry is an important basic industry in China, and relates to important industries of national life, including coal chemical industry, refining chemical industry, natural gas chemical industry, petrochemical industry, organic/inorganic chemical industry, fine chemical industry and the like, and enterprises in the chemical industry usually generate a large amount of wastewater in the production process, especially in the coal chemical industry. In the coal chemical industry, the wastewater discharged by the method has the characteristics of large water quantity, high turbidity, high chromaticity and high salinity, and meanwhile, refractory organic matters exist in the wastewater, so that CODcr in the wastewater is higher. How to realize the cooperative operation of wastewater treatment and simultaneously and conveniently recycling organic matters, so that chemical wastewater is treated and recycled, the environment pollution caused by the wastewater is avoided, and the comprehensive utilization of resources is realized, which is the field which is always explored by the technicians in the field.

Disclosure of Invention

Aiming at the chemical wastewater with high turbidity, high chromaticity, high salinity and refractory organic matters, the invention provides a chemical wastewater treatment and recycling device so as to realize the environment-friendly treatment and recycling of the chemical wastewater.

The chemical wastewater treatment and recycling device comprises an evaporation kettle, a water diversion unit and a wastewater treatment unit which are sequentially connected, wherein the water diversion unit comprises a water diversion device, and a movable organic matter recovery device is arranged in the water diversion device and is used for recovering organic matters in the water diversion device; the wastewater treatment unit comprises an electrocatalytic treatment device in the water separator and a secondary treatment device outside the water separator; the water outlet pipeline of the wastewater treatment unit is connected in parallel with the first water distribution pipe of the evaporation kettle, the second water distribution pipe of the water distribution unit and the water inlet pipe of the secondary treatment device, and is respectively used for recycling the treated water to be used for wastewater salt recrystallization and/or recrystallization and purification treatment, electrocatalytic filler flushing and wastewater treatment filler regeneration in the evaporation kettle.

Optionally, a first water distribution pipe is arranged at the upper part of the evaporation kettle and is connected with a water inlet of the evaporation kettle to supply water for salt crystallization and separation of wastewater in the evaporation kettle; the top of the evaporation kettle is provided with a steam outlet, the steam outlet is connected with the water separator of the water separation unit through a pipeline, and the steam evaporated by the wastewater is input into the water separation unit.

Optionally, the evaporation kettle is provided with a first water return pipe, one end of the first water return pipe is connected with a water inlet of the evaporation kettle, and the other end of the first water return pipe is connected with a water outlet pipeline of the wastewater treatment unit, and the treated water outlet is reused for wastewater salt recrystallization and/or recrystallization and purification treatment water supply in the evaporation kettle.

Optionally, the water diversion unit comprises a water diversion device, an organic matter recovery device and a condenser, wherein an outlet at the top of the water diversion device is connected with the condenser through a pipeline, and the water diversion device is internally provided with the movable organic matter recovery device.

Optionally, the organic matter recovery device comprises a siphon, a liquid suction port, a connecting device and a lifter, wherein one end of an inlet of the siphon is arranged on the inner wall of the water separator, and one end of an outlet of the siphon extends out of the water separator and is connected with the organic matter storage tank; the inlet of the siphon tube is communicated with the liquid suction port through a connecting device; the liquid suction port is arranged on the lifter, and the lifter is used for controlling the height of the liquid suction port in the water separator.

Optionally, the lifter comprises an electro-hydraulic push rod, a lifting frame and a positioning switch, wherein the electro-hydraulic push rod is fixed on the outer side wall of the water separator, a plunger head of the electro-hydraulic push rod is connected with the lifting frame, the lifting frame penetrates through the top surface of the water separator to extend into the water separator, a liquid suction port is arranged at the bottom of the lifting frame, and the liquid suction port is fixedly connected with the tail end of the connecting device; the positioning switch is fixed on the connecting frame, and the connecting frame is fixed on the outer side wall of the water separator and is parallel to the moving direction of the plunger head of the electro-hydraulic push rod.

Further optionally, the positioning switch comprises an upper limiting block, a middle control limiting block and a lower limiting block, the middle control limiting block can move up and down on the connecting frame, and the plunger head is provided with a convex clamping plate at a position corresponding to the positioning switch.

The siphon pipe outside the water separator is sequentially provided with the first control valve and the vacuum pump, namely the siphon pipe outside the water separator is sequentially connected with the organic matter storage tank through the first control valve and the vacuum pump, the vacuum pump pumps air in the siphon pipe in advance to form vacuum, then the first control valve controlled in a linkage mode is opened, the vacuum pump is stopped to pump the vacuum, the principle of liquid siphon is utilized, additional power is not needed, organic matters in the water separator are automatically pumped away, energy is saved, and consumption is reduced.

The wastewater treatment unit comprises an electrocatalytic treatment device in the water separator and a secondary treatment device outside the water separator, and optionally, the electrocatalytic treatment device comprises an electrode filler and an electric controller, the electrode filler is arranged at the lower part in the water separator, the electric controller is arranged outside the water separator and connected with a power supply, and the second water distribution pipe is arranged above the electrode filler.

Optionally, the water knockout drum is equipped with the second wet return, and the second wet return is connected to the one end of second wet return, and the other end is connected wastewater treatment unit's outlet pipeline for wash the electrode packing of water knockout drum, improve its conductive properties, and then improve the effect of wastewater electrocatalytic oxidation treatment.

Optionally, the secondary treatment device comprises a decoloring tank and an RO reverse osmosis device which are sequentially connected, the bottom of the water separator is provided with a discharge port and a second control valve, the discharge port is connected with a water inlet pipe at the bottom of the decoloring tank through a pipeline, and a plurality of zeolite filler layers which are uniformly fixed and are tightly connected with the inner wall of the decoloring tank are arranged in the decoloring tank; the water outlet pipeline of the RO reverse osmosis device, namely the water outlet pipeline of the wastewater treatment unit, is connected with the reclaimed water storage pool.

Further optionally, a first three-way valve is installed on the water inlet pipe of the decolorizing tank, a first end of the first three-way valve is connected with a pipeline connected with the second control valve, and a second end of the first three-way valve is connected with a water inlet at the bottom of the decolorizing tank through a circulating pump; the first end of the second three-way valve is connected with the water outlet pipe of the decolorizing tank, the third end of the first three-way valve is connected with the second end of the second three-way valve, and the third end of the second three-way valve is connected with the RO reverse osmosis device.

And forming a circulating pipeline of the decoloring tank through the first three-way valve, the second three-way valve and the circulating pump. The circulating pump is a rotor pump capable of running in forward and reverse directions, the conveying direction of water flow can be changed through motor driving phase modulation control, when the circulating pump is in forward running, the circulating pump is used for circulating adsorption decoloration to reduce turbidity of wastewater, and when the circulating pump is in reverse running, the discharged water reuse washing zeolite filler layer of the RO reverse osmosis device is regenerated.

Optionally, a third three-way valve is arranged between the RO reverse osmosis device and the reclaimed water storage tank, a first end of the third three-way valve is connected with the RO reverse osmosis device, a second end of the third three-way valve is connected with the reclaimed water storage tank, a third end of the third three-way valve is respectively connected with a first return pipe of the evaporation kettle, a second return pipe of the water separator and a water inlet pipe of the decolorizing tank through a recycling pipeline and a branch pipe thereof and a flowmeter and a recycling valve arranged on the branch pipe, and the third end of the third three-way valve is respectively used for recycling treated effluent water for wastewater salinity crystallization and/or recrystallization and purification treatment, electrocatalytic filler flushing and wastewater treatment filler regeneration in the evaporation kettle. When the chemical wastewater treatment, i.e. recycling device is operated intermittently, the effluent of the RO reverse osmosis device is recycled to the evaporation kettle, and at the moment, the effluent is recrystallized, so that water in the wastewater can be separated from salt, and the salt is purified; when continuous production is carried out, the effluent is recycled to the evaporation kettle, so that the crystallization purification in the evaporation process can be assisted, and the crystallization purification with better effect can be realized.

Optionally, the chemical wastewater treatment and recycling device further comprises a falling film evaporator, a discharge port of the falling film evaporator is connected with a water inlet of the evaporation kettle, a water phase steam outlet of the falling film evaporator and a steam outlet at the top of the evaporation kettle are both connected with a water separator, and wastewater steam is input into the water separation unit.

The falling film evaporator comprises a plurality of first guide pipes, a plurality of second guide pipes and heating pipes which are respectively connected with the bottom ends of the first guide pipes and the second guide pipes, wherein the top ends of the first guide pipes are connected with a first water distributor, and the first water distributor is connected with a feed inlet; the lower part of the first guide pipe is provided with a first liquid collecting tank which is connected with a second water distributor through a first pump and a pipeline, and the top end of the second guide pipe is connected with the second water distributor; the first guide pipe and the second guide pipe are obliquely arranged.

Optionally, the first guide pipes and the second guide pipes are respectively arranged in a row, that is, a plurality of first guide pipes are arranged in a row in the horizontal direction, a plurality of second guide pipes are arranged in a row in the horizontal direction, the two rows of guide pipes are arranged side by side front and back, and the inclination directions of the first guide pipes and the second guide pipes are opposite, that is, the first guide pipes and the second guide pipes are arranged in an X shape.

Further optionally, the falling film evaporator includes a plurality of rows of first guide pipes and a plurality of rows of second guide pipes, and one row of first guide pipes and one row of second guide pipes are alternately arranged, that is, one row of first guide pipes are respectively arranged at the front side and the rear side of one row of second guide pipes.

The top end of the first guide pipe is connected with a first water distributor, the first water distributor is connected with a feed inlet and is used for introducing feed of the falling film evaporator into the first water distributor and uniformly flowing to the first guide pipe from the first water distributor. Optionally, each row of first guide pipes is correspondingly connected with a first water distributor, and preferably, the first water distributors are long-strip-shaped. The first water distributor is a water distributor of the existing falling film evaporator in the market, and the invention is not particularly limited as long as the first water distributor can distribute water for the first diversion pipes distributed in rows.

Optionally, the falling film evaporator comprises a plurality of rows of first water distributors corresponding to the plurality of rows of first draft tubes, and each row of first water distributors is correspondingly connected with one row of first draft tubes.

Optionally, the lower part of first honeycomb duct is equipped with first collecting tank for collect from the liquid of another looks of vertical whereabouts of first honeycomb duct, the surface of first collecting tank is equipped with a plurality of through-hole, is used for first honeycomb duct to pass first collecting tank, just the aperture of through-hole slightly is greater than the external diameter of first honeycomb duct, makes the liquid of first honeycomb duct surface can flow to the heating pipe of first honeycomb duct below through the through-hole.

The first liquid collecting tank is connected with the second water distributor through a first pump and a pipeline, the top end of the second flow guide pipe is connected with the second water distributor, liquid collected by the first liquid collecting tank is pumped into the second water distributor through the first pump, distributed by the second water distributor and flows down along the second flow guide pipe, and then flows through a heating pipe below the second flow guide pipe to form a film and evaporate, so that the water phase and the oil phase are separated.

Optionally, each row of second guide pipes is correspondingly connected with a second water distributor, and preferably, the second water distributors are long-strip-shaped. The second water distributor is a water distributor of the existing falling film evaporator in the market, and only the second diversion pipes distributed in rows can be used for distributing water, so that the invention is not particularly limited.

Optionally, the falling film evaporator comprises a plurality of rows of second guide pipes corresponding to the plurality of rows of second water distributors, each row of second water distributors is correspondingly connected with one row of second guide pipes, and the plurality of rows of second water distributors and the plurality of rows of first water distributors are distributed in a staggered manner, namely, the front side and the rear side of the one row of second water distributors are respectively provided with one row of first water distributors.

Optionally, the lower part of second honeycomb duct is equipped with the second collecting tank for collect from the liquid of another looks of the vertical whereabouts of second honeycomb duct, the surface of second collecting tank is equipped with a plurality of through-hole, is used for the second honeycomb duct to pass the second collecting tank, and the aperture of through-hole slightly is greater than the external diameter of second honeycomb duct, makes the liquid of second honeycomb duct surface can flow to the heating pipe of second honeycomb duct below through the through-hole.

Preferably, the first liquid collecting tank and the second liquid collecting tank are the same in height, and the lower surfaces of the first liquid collecting tank and the second liquid collecting tank are in butt joint with each other, so that no gap exists between the first liquid collecting tank and the second liquid collecting tank. Further preferably, the first liquid collecting tank and/or the second liquid collecting tank are/is in contact with the inner wall of the falling film evaporator, namely the first liquid collecting tank and the second liquid collecting tank divide the falling film evaporator into two areas, and the heating pipe is positioned in the lower evaporation area, so that steam in the evaporation area cannot enter the upper diversion area where the first diversion pipe and the second diversion pipe are positioned, and separation of feeding and steam is realized.

Optionally, the surface material of the first flow guiding pipe is a material with stronger attraction to the polar liquid, such as glass, and drains the water phase, so that the oil phase vertically falls into the first liquid collecting tank, and the oil phase is separated; the surface material of the second flow guiding pipe is a material with stronger non-polar liquid attraction, such as plastic and a drainage oil phase, so that the water phase vertically falls into the second liquid collecting tank, and the water phase is separated. In practical application, the materials of the first guide pipe and the second guide pipe can be exchanged.

The first honeycomb duct and the second honeycomb duct are X type and lay for the heating pipe position of first honeycomb duct and second honeycomb duct below separates, and the liquid of different natures is formed film evaporation on the heating pipe of each region, for separating aqueous phase steam and oil phase steam, be equipped with the division board between heating pipe that first honeycomb duct connects and the heating pipe that second honeycomb duct connects, and the top fixed connection of division board the lower surface of first collecting tank and second collecting tank will the evaporation district is divided into aqueous phase steam zone and oil phase steam zone, makes aqueous phase steam and oil phase steam be controlled respectively in corresponding region.

Optionally, a water phase steam outlet is arranged on the side wall of the falling film evaporator in the water phase steam zone, and an oil phase steam outlet is arranged on the side wall of the falling film evaporator in the oil phase steam zone.

The chemical wastewater treatment and recycling device can realize treatment and recycling of chemical wastewater, namely, can recycle organic pollutants in the wastewater while condensing and separating water treatment of chemical wastewater evaporation, and can realize electrocatalytic oxidation treatment of a water phase in the wastewater, thereby realizing synchronous and collaborative treatment of a water separation process, organic matter recycling treatment and environmental protection treatment process. The effluent of the wastewater treatment unit can be reused in an evaporation kettle, a water separator and a decoloring tank, so that comprehensive utilization of resources is realized. The invention has strong practicability, can avoid the environment pollution caused by waste water, can realize comprehensive utilization of resources, and has great popularization and application values.

In addition, the organic matter recovery device adopts a vacuum lifting siphon mode, thereby being applicable to the treatment of chemical wastewater with various reactions and various working conditions while saving energy and reducing consumption,

The falling film evaporator provided by the invention is characterized in that a first guide pipe and a second guide pipe are arranged above a heating pipe for forming a liquid film for primarily separating water phase and oil phase in chemical wastewater aiming at the characteristics of high turbidity, high chromaticity, high salinity and the existence of refractory organic matters of the chemical wastewater, and plays an auxiliary synergistic role for an organic matter recovery device in a water separator.

Drawings

FIG. 1 is a schematic structural view of the chemical wastewater treatment and recycling device.

Fig. 2 is a schematic structural view of the organic matter recovery device.

Fig. 3 is a schematic top view of an electrode packing.

Fig. 4 is a schematic view of the structure of the first water distribution pipe or the second water distribution pipe.

Fig. 5 is a schematic structural view of a falling film evaporator.

FIG. 6 is a schematic cross-sectional view at A-A' of FIG. 5.

In the drawings of which there are shown, 1 is an evaporation kettle, 2 is a water separator, 3 is a condenser, 4 is a siphon, 5 is a first control valve, 6 is a vacuum pump, 7 is a flexible connecting pipe, 8 is a lifter, 9 is an electrode filler, 10 is an electric controller, 11 is a second control valve, 12 is a decoloring tank, 13 is a zeolite filler layer, 14 is a first three-way valve, 15 is a circulating pump, 16 is a second three-way valve, 17 is a booster pump, 18 is an RO reverse osmosis device, 19 is a third three-way valve, 20 is a recycling pipeline, 21 is a branch pipe, 22 is a flowmeter, 23 is a recycling valve, 24 is a first water distribution pipe, 25 is a micropore, 26 is a reclaimed water storage tank 27 is an electrohydraulic push rod, 28 is a lifting frame, 29 is a positioning switch, 30 is a plunger head, 31 is a connecting frame, 32 is a second water distribution pipe, 33 is a first water return pipe, 34 is a second water return pipe, 35 is a clamping plate, 36 is a long-strip water suction pipe, 37 is a falling film evaporator, 38 is a first guide pipe, 39 is a second guide pipe, 40 is a heating pipe, 41 is a first water distributor, 42 is a second water distributor, 43 is a first liquid collecting tank, 44 is a second liquid collecting tank, 45 is an evaporation zone, 46 is a flow guiding zone, 47 is a separation plate, 48 is a water phase steam zone, and 49 is an oil phase steam zone.

Detailed Description

The chemical wastewater treatment and recycling device provided by the embodiment, as shown in fig. 1, comprises an evaporation kettle 1, a water diversion unit and a wastewater treatment unit which are sequentially connected, wherein the water diversion unit comprises a water diversion device 2, and a movable organic matter recovery device is arranged in the water diversion device 2 and is used for recovering organic matters in the water diversion device 2; the wastewater treatment unit comprises an electrocatalytic treatment device in the water separator 2 and a secondary treatment device outside the water separator 2; the water outlet pipeline of the wastewater treatment unit is connected in parallel with the first water distribution pipe 24 of the evaporation kettle 1, the second water distribution pipe 32 of the water diversion unit and the water inlet pipe of the secondary treatment device, and is respectively used for recycling the treated water to be used for wastewater salt crystallization and/or recrystallization and purification treatment, electrocatalytic filler flushing and wastewater treatment filler regeneration in the evaporation kettle 1.

Optionally, a first water distribution pipe 24 is arranged at the upper part of the evaporation kettle 1, the first water distribution pipe 24 is connected with a water inlet of the evaporation kettle 1, and water is supplied for salt crystallization and/or recrystallization and purification treatment of the wastewater in the evaporation kettle 1; the top of the evaporation kettle 1 is provided with a steam outlet, the steam outlet is connected with the water separator 2 of the water separation unit through a pipeline, and the steam evaporated by the wastewater is input into the water separation unit.

Optionally, the evaporation kettle 1 is provided with a first water return pipe 33, one end of the first water return pipe 33 is connected with the water inlet of the evaporation kettle 1, and the other end of the first water return pipe is connected with the water outlet pipeline of the wastewater treatment unit, so that the treated water outlet is reused for the wastewater salt recrystallization and salt separation and purification treatment in the evaporation kettle 1.

Optionally, the evaporation kettle 1 is a vacuum evaporation kettle, and a mechanical stirring device is arranged in the evaporation kettle 1, and further optionally, the mechanical stirring device adopts variable frequency control.

Optionally, the evaporation kettle 1 is provided with a temperature controller for controlling the heating temperature in the evaporation kettle 1.

Optionally, the water knockout drum unit includes water knockout drum 2, organic matter recovery unit and condenser 3, the top export of water knockout drum 2 is equipped with mobilizable organic matter recovery unit through the pipeline connection condenser 3 in the water knockout drum 2.

Further alternatively, the condenser 3 is a tube condenser.

Optionally, the organic matter recovery device comprises a siphon pipe 4, a liquid suction port, a connecting device and a lifter 8, wherein one inlet end of the siphon pipe 4 is arranged on the inner wall of the water separator 2, and one outlet end of the siphon pipe 4 extends out of the water separator 2 and is connected with an organic matter storage tank; the inlet of the siphon pipe 4 is communicated with the liquid suction port through a connecting device; the liquid suction port is arranged on a lifter 8, and the lifter 8 is used for controlling the height of the liquid suction port in the water separator 2.

Optionally, the connecting device is a flexible connecting pipe 7, the flexible connecting pipe 7 is made of stainless steel, and the arrangement of the flexible connecting pipe 7 ensures that the inlet of the siphon 4 can be lifted and moved up and down under the action of the lifter 8.

Optionally, the siphon 4 is arranged on the upper part of the side wall of the water separator 2, and as the organic phase formed after the condensation of the waste water vapor is positioned on the water phase, the siphon 4 is arranged on the upper part of the side wall of the water separator 2, thereby saving the length of the flexible connecting pipe 7 and avoiding the excessive unnecessary displacement of the lifter 8.

As an embodiment, the siphon tube 4 is fixedly connected with the water separator 2, that is, the siphon tube 4 is fixed at the position or the height of the water separator 2, and the height position of the siphon tube 4 can be determined by theoretical calculation through specific reaction.

As an implementation manner, the siphon 4 is movably connected with the water separator 2, that is, the height of the siphon 4 is changed according to the difference of the liquid level of the organic phase, so that the siphon can be suitable for treating chemical wastewater with various reactions or various working conditions. The invention is not particularly limited in that the siphon pipe 4 and the water separator 2 are movably connected, for example, a plurality of connectors with different heights are arranged on the side wall of the water separator 2, the siphon pipe 4 passes through the connectors to enter the water separator 2, and sealing treatment is carried out at the connectors to avoid liquid leakage in the water separator 2.

Optionally, as shown in fig. 2, the lifter 8 includes an electro-hydraulic push rod 27, a lifting frame 28 and a positioning switch 29, where the electro-hydraulic push rod 27 is fixed on the outer side wall of the water separator 2, a plunger head 30 of the electro-hydraulic push rod 27 is connected with the lifting frame 28, the lifting frame 28 penetrates through the top surface of the water separator 2 and stretches into the water separator 2, a liquid suction port is arranged at the bottom of the lifting frame 28, and the liquid suction port is fixedly connected with the tail end of the flexible connecting pipe 7; the positioning switch 29 is fixed on a connecting frame 31, and the connecting frame 31 is fixed on the outer side wall of the water separator 2 and is parallel to the moving direction of the plunger head 30 of the electro-hydraulic push rod 27.

When the device is used, the plunger head 30 of the electro-hydraulic push rod 27 moves up and down and drives the lifting frame 28 to synchronously move up and down, so that the liquid suction port moves up and down, the positioning switch 29 is used for controlling the moving distance of the plunger head 30, the siphon 4 provides attractive force, organic matters in the water separator 2 sequentially pass through the liquid suction port, the flexible connecting pipe 7 and the siphon 4 and are input into the organic matter storage tank, the recovery of the organic matters in the water separator 2 is completed, and meanwhile, the residual water phase is convenient to be treated by the wastewater treatment unit.

Further alternatively, the positioning switch 29 includes an upper limiting block, a middle control limiting block and a lower limiting block, where the middle control limiting block can move up and down on the connecting frame 31, and the plunger head 30 is provided with a protruding clamping plate 35 at a position corresponding to the positioning switch 29.

When the plunger head 30 moves upwards under the action of the electro-hydraulic push rod 27, the lifting frame 28 and the liquid suction port are driven to move upwards together, and when the clamping plate 35 moves to the position of the upper limiting block, the clamping plate is blocked by the upper limiting block, so that the plunger head 30 does not move upwards any more, and the maximum height of the lifting frame 28 is limited; when the plunger head 30 moves downwards under the action of the electro-hydraulic push rod 27, the lifting frame 28 and the liquid suction port are driven to move downwards together, and when the clamping plate 35 moves to the position of the lower limiting block, the lower limiting block blocks the plunger head 30, so that the plunger head 30 does not move downwards any more, the lowest descending height of the lifting frame 28 is limited, and the vertical movement distance of the lifting frame 28 and the liquid suction port is not more than the top surface and the bottom surface of the water separator 2; according to the height of the actual organic matters in the water separator 2, the positioning of the central control limiting block on the connecting frame 31 is reasonably adjusted, when the clamping plate 35 of the plunger head 30 moves to the position of the central control limiting block, the plunger head 30 stops moving, and at the moment, the lifting frame 28 and the liquid suction port move to the position of the organic matters.

Optionally, the liquid suction port is in a strip tubular shape, and the length of the liquid suction port is slightly smaller than the width of the water separator 2, so that the liquid suction port accords with the interface shape of oil/water two phases, further optionally, the liquid suction ports are uniformly distributed around the outer side surface of the strip water suction pipe 36, the flexible connecting pipe 7 is connected with one end, close to the siphon pipe 4, of the strip water suction pipe 36, and the strip water suction pipe 36 is fixed at the bottom end of the lifting frame 28.

The shape of the lifting frame 28 is not particularly limited as long as the top end is connected to the top end of the plunger head 30 and the bottom end is connected to the liquid suction port. For example, the lifting frame 28 is cross-shaped, the top end of the lifting frame is connected with the top end of the plunger head 30, the bottom end of the lifting frame is connected with the liquid suction port or long strip water suction pipe 36, the middle cross beam is parallel to the long strip water suction pipe 36, so that the lifting frame 28 vertically moves in the water separator 2, and the liquid suction port or long strip water suction pipe 36 is kept horizontal, so that the interface between oil and water phases can be better fit.

The siphon pipe 4 positioned outside the water separator 2 is sequentially provided with the first control valve 5 and the vacuum pump 6, namely the siphon pipe 4 positioned outside the water separator 2 is sequentially connected with the organic matter storage tank through the first control valve 5 and the vacuum pump 6, the vacuum pump 6 pumps air in the siphon pipe 4 in advance to form vacuum, then the first control valve 5 controlled in a linkage mode is opened, the vacuum pump 6 is stopped from pumping vacuum, the principle of liquid siphon is utilized, additional power is not needed, the organic matter in the water separator 2 is automatically pumped away, and the energy and consumption are saved.

Aiming at the characteristics of high organic matter content, high salt content and high turbidity of chemical wastewater, the chemical wastewater treatment and recycling device utilizes the evaporation treatment of the evaporation kettle 1 under different temperature control, and the organic matters carried by wastewater and waste water are evaporated and cooled and condensed into the water separator 2 through the condenser 3; the siphon 4 extracts and collects the organic matter layer at the upper layer in the water separator 2, and can be recycled to a production workshop, wherein the siphon 4 moves the liquid suction port to the organic matter layer according to the difference of the liquid level of the two-phase interface in the water separator 2 under the action of the lifter 8, and can be positioned in the organic matter layer or the two-phase interface. The recovery method is simple and efficient, and has low energy consumption.

The wastewater treatment unit comprises an electrocatalytic treatment device in the water separator 2 and a secondary treatment device outside the water separator 2, and optionally, the electrocatalytic treatment device comprises an electrode packing 9 and an electric controller 10, wherein the electrode packing 9 is arranged at the lower part in the water separator 2, the electric controller 10 is arranged outside the water separator 2 and is connected with a power supply, and the second water distribution pipe 32 is arranged above the electrode packing 9.

After the organic matters in the water separator 2 are sucked out and recovered by the siphon pipe 4, the residual water phase wastewater at the lower part of the water separator 2 is powered on, and under the control of the electric controller 10, the residual organic pollutants in the wastewater are subjected to oxidation treatment under the electrocatalytic oxidation effect generated by electrifying the electrode packing 9, so that the organic pollutants in the wastewater can be thoroughly oxidized and decomposed.

Optionally, the water separator 2 is provided with a second water return pipe 34, one end of the second water return pipe 34 is connected with the second water distribution pipe 32, and the other end of the second water return pipe is connected with a water outlet pipeline of the wastewater treatment unit, so that the electrode packing 9 of the water separator 2 is washed, the conductivity of the electrode packing is improved, and the effect of electrocatalytic oxidation treatment of wastewater is further improved.

Optionally, the electrode filler 9 is arranged in the water separator 2 in a plate-shaped parallel distribution mode, the electrode filler 9 is made of graphite, and the resistivity is smaller than 2.0Ω·m. Further alternatively, as shown in fig. 3, the electrode packing 9 is uniformly distributed in a porous shape.

Optionally, the secondary treatment device comprises a decolorizing tank 12 and an RO reverse osmosis device 18 which are sequentially connected, the bottom of the water separator 2 is provided with a discharge port and a second control valve 11, the discharge port is connected with a water inlet pipe at the bottom of the decolorizing tank 12 through a pipeline, and a plurality of zeolite filler layers 13 which are uniformly fixed and are tightly connected with the inner wall of the decolorizing tank are arranged in the decolorizing tank 12; the water outlet line of the RO reverse osmosis apparatus 18, i.e. the water outlet line of the wastewater treatment unit, is connected to a reclaimed water reservoir 26.

Further optionally, a first three-way valve 14 is installed on the water inlet pipe of the decolorizing tank 12, a first end of the first three-way valve 14 is connected with a pipeline connected with the second control valve 11, and a second end of the first three-way valve 14 is connected with the water inlet at the bottom of the decolorizing tank 12 through a circulating pump 15; the water outlet pipe of the decolorizing tank 12 is provided with a second three-way valve 16, a first end of the second three-way valve 16 is connected with the water outlet pipe of the decolorizing tank 12, a second end of the second three-way valve 16 is connected with a third end of the first three-way valve 14, and a third end of the second three-way valve 16 is connected with an RO reverse osmosis device 18.

A circulation line of the decoloring tank 12 is formed through the first three-way valve 14, the second three-way valve 16 and the circulation pump 15. The circulating pump 15 is a rotor pump capable of running in forward and reverse directions, the conveying direction of water flow can be changed through motor driving phase modulation control, when the circulating pump 15 is running in forward direction, the circulating pump is used for circulating adsorption decoloration to reduce turbidity of wastewater, and when the circulating pump 15 is running in reverse direction, the discharged water of the RO reverse osmosis device 18 is recycled to wash the zeolite filler layer 13 for regeneration.

Optionally, a booster pump 17 and a security filter are arranged between the second three-way valve 16 and the RO reverse osmosis device 18, and are used for security treatment of the reverse osmosis device when the wastewater quality is poor.

Optionally, a third three-way valve 19 is arranged between the RO reverse osmosis device 18 and the reclaimed water storage tank 26, a first end of the third three-way valve 19 is connected with the RO reverse osmosis device 18, a second end of the third three-way valve 19 is connected with the reclaimed water storage tank 26, and a third end of the third three-way valve 19 is respectively connected with a first water return pipe 33 of the evaporation kettle 1, a second water return pipe 34 of the water separator 2 and a water inlet pipe of the decolorizing tank 12 through a recycling pipeline 20 and a branch pipe 21 thereof and a flowmeter 22 and a recycling valve 23 arranged on the branch pipe.

Alternatively, as shown in fig. 4, the first water distribution pipe 24 and the second water distribution pipe 32 are respectively and fixedly installed on the inner side walls of the evaporation kettle 1 and the water separator 2, and are all in a ring shape, micropores 25 are formed on the bottom surfaces of the first water distribution pipe 24 and the second water distribution pipe 32, and the aperture of the micropores 25 is 0.1-10 cm. It is further preferable that the micropores 25 are sequentially staggered according to different opening angles, for example, the included angles between two adjacent micropores 25 and the horizontal direction are respectively 45 ° and 135 °, that is, two adjacent micropores 25 are respectively distributed on two sides in an oblique manner, so that the micropores are repeatedly distributed.

According to the chemical wastewater treatment and recycling device, after organic matters are recycled by the siphon pipe 4, water phase wastewater is subjected to electrocatalytic oxidation treatment in the water separator 2 and then is input into the decolorizing tank 12 for treatment, and impurity pollutants in the wastewater are adsorbed and treated under the action of the zeolite filler layer 13, so that the turbidity and chromaticity of the wastewater are reduced; the circulating pump 15, the first three-way valve 14, the second three-way valve 16 and related circulating pipelines are designed, so that the wastewater entering the decolorizing tank 12 can be subjected to circulating decolorizing treatment according to the requirement, and the turbidity and chromaticity removal rate of the wastewater can be improved; the wastewater is treated by a reverse osmosis membrane in the RO reverse osmosis device 18, and ions and impurity pollutants in the wastewater are further removed by utilizing the filtering and purifying functions of the reverse osmosis membrane, so that the water quality is purified, and the treated wastewater can reach the GB/T19923-2005 industrial water quality recycling standard, thereby realizing reclaimed water recycling.

Optionally, the chemical wastewater treatment and recycling device further comprises a falling film evaporator 37, a discharge hole of the falling film evaporator 37 is connected with a water inlet of the evaporation kettle 1, a water phase steam outlet of the falling film evaporator 37 and a steam outlet at the top of the evaporation kettle 1 are both connected with the water separator 2, and wastewater steam is input into the water separation unit.

As shown in fig. 5 and 6, the falling film evaporator 37 includes a plurality of first guide pipes 38, a plurality of second guide pipes 39, and heating pipes 40 respectively connected to bottom ends of the first guide pipes 38 and the second guide pipes 39, wherein a top end of the first guide pipe 38 is connected to a first water distributor 41, and the first water distributor 41 is connected to a feed inlet; the lower part of the first guide pipe 38 is provided with a first liquid collecting tank 43, the first liquid collecting tank 43 is connected with a second water distributor 42 through a first pump and a pipeline, and the top end of the second guide pipe 39 is connected with the second water distributor 42; the first guide pipe 38 and the second guide pipe 39 are obliquely arranged.

The falling film evaporator 37 is characterized in that a first guide pipe 38 and a second guide pipe 39 are arranged above a heating pipe for forming a liquid film for primarily separating water phase and oil phase in chemical wastewater aiming at the characteristics of high turbidity, high chromaticity, high salinity and the existence of refractory organic matters in the chemical wastewater, and plays an auxiliary synergistic role for an organic matter recovery device in the water separator 2.

The falling film evaporator 37 is provided with different acting forces by selecting different materials of the first flow guide pipe 38 and the second flow guide pipe 39, and meanwhile, the acting forces are matched with the inclined arrangement of the flow guide pipes, so that the liquid with strong attraction can flow down along the inclined flow guide pipe, the liquid with weak attraction vertically falls down from a certain position of the flow guide pipe under the action of gravity, falls into the first liquid collecting tank 43 and flows down by the drainage of another type of flow guide pipe. Finally, the water phase and the oil phase flow through the heating pipes 40 connected below the respective flow guide pipes, and a liquid film is formed on the heating pipes 40 for evaporation separation.

Optionally, the first flow guiding pipes 38 and the second flow guiding pipes 39 are respectively arranged in a row, that is, a plurality of first flow guiding pipes 38 are arranged in a row in the horizontal direction, a plurality of second flow guiding pipes 39 are arranged in a row in the horizontal direction, the two rows of flow guiding pipes are arranged side by side, and the inclination directions of the first flow guiding pipes 38 and the second flow guiding pipes 39 are opposite, that is, the first flow guiding pipes 38 and the second flow guiding pipes 39 are arranged in an X shape.

Further optionally, the falling film evaporator 37 includes a plurality of rows of first guide pipes 38 and a plurality of rows of second guide pipes 39, where the first guide pipes 38 and the second guide pipes 39 are staggered, i.e. the front and rear sides of the second guide pipes 39 are respectively provided with the first guide pipes 38.

The arrangement mode of the guide pipes can furthest utilize the space in the falling film evaporator 37, is particularly suitable for a large-scale wastewater treatment system, and the first guide pipe 38 and the second guide pipe 39 with opposite inclination directions respectively guide the water phase and the oil phase to two different directions, and then form a film along the heating pipes 40 respectively connected for evaporation, namely, the design mode of X-shaped arrangement can be matched with the design of the first guide pipe 38 and the second guide pipe 39, so that the water phase and the oil phase are further separated.

The top end of the first guide pipe 38 is connected with a first water distributor 41, and the first water distributor 41 is connected with a feed inlet and is used for introducing the feed of the falling film evaporator 37 into the first water distributor 41 and uniformly flowing from the first water distributor 41 to the first guide pipe 38. Optionally, each row of first guide pipes 38 is correspondingly connected to a first water distributor 41, and preferably, the first water distributor 41 is in a strip shape. The first water distributor 41 may be a water distributor of a falling film evaporator existing in the market, as long as it distributes water for the first guide pipes 38 arranged in a row, and the present invention is not particularly limited.

Optionally, corresponding to the rows of first guide pipes 38, the falling film evaporator 37 includes the rows of first water distributors 41, and each row of first water distributors 41 is correspondingly connected to one row of first guide pipes 38.

Optionally, a first liquid collecting tank 43 is disposed at the lower portion of the first flow guiding pipe 38 and is used for collecting the liquid of another phase falling vertically from the first flow guiding pipe 38, a plurality of through holes are disposed on the surface of the first liquid collecting tank 43 and are used for the first flow guiding pipe 38 to pass through the first liquid collecting tank 43, and the aperture of the through holes is slightly larger than the outer diameter of the first flow guiding pipe 38, so that the liquid on the outer surface of the first flow guiding pipe 38 can flow to the heating pipe 40 below the first flow guiding pipe 38 through the through holes.

Optionally, the first liquid collecting tank 43 is inclined, so that the liquid on the first liquid collecting tank 43 naturally flows to the first pump under the action of gravity.

Further optionally, an overflow weir is disposed at the higher end of the first liquid collecting tank 43, so as to prevent the liquid from overflowing the first liquid collecting tank 43 when too much liquid falls into the first liquid collecting tank 43 due to fluctuation of the feeding amount.

The first liquid collecting tank 43 is connected with the second water distributor 42 through a first pump and a pipeline, the top end of the second flow guide pipe 39 is connected with the second water distributor 42, liquid collected by the first liquid collecting tank 43 is pumped into the second water distributor 42 through the first pump, distributed by the second water distributor 42 and flows down along the second flow guide pipe 39, and then flows through the heating pipe 40 below the second flow guide pipe 39 to form a film and evaporate, so that the water phase and the oil phase are separated.

Optionally, each row of second guide pipes 39 is correspondingly connected to a second water distributor 42, and preferably, the second water distributor 42 is in a strip shape. The second water distributor 42 may be a water distributor of a falling film evaporator existing in the market, as long as it distributes water for the second guide pipes 39 arranged in a row, and the present invention is not particularly limited.

Optionally, corresponding to the plurality of rows of second guide pipes 39, the falling film evaporator 37 includes a plurality of rows of second water distributors 42, each row of second water distributors 42 is correspondingly connected with one row of second guide pipes 39, and the plurality of rows of second water distributors 42 and the plurality of rows of first water distributors 41 are staggered, i.e. the front side and the rear side of one row of second water distributors 42 are respectively provided with one row of first water distributors 41.

Optionally, a second liquid collecting tank 44 is disposed at the lower portion of the second flow guiding pipe 39, for collecting the liquid of another phase vertically falling from the second flow guiding pipe 39, a plurality of through holes are disposed on the surface of the second liquid collecting tank 44, for the second flow guiding pipe 39 to pass through the second liquid collecting tank 44, and the aperture of the through holes is slightly larger than the outer diameter of the second flow guiding pipe 39, so that the liquid on the outer surface of the second flow guiding pipe 39 can flow to the heating pipe 40 below the second flow guiding pipe 39 through the through holes.

Optionally, the second liquid collecting tank 44 is inclined, so that the liquid on the second liquid collecting tank 44 naturally flows to the second pump under the action of gravity.

Further optionally, an overflow weir is disposed at the end of the second liquid collecting tank 44 with a higher level, so as to prevent the liquid from overflowing the second liquid collecting tank 44 when too much liquid falls into the second liquid collecting tank 44 due to the fluctuation of the liquid flow rate of the second flow guiding pipe 39.

The second liquid collecting tank 44 is connected with the first water distributor 41 through a second pump and a pipeline, and liquid collected by the second liquid collecting tank 44 is pumped into the first water distributor 41 through the second pump, a small amount of liquid of another phase separated by the second flow guide pipe 39 is conveyed back to the first water distributor 41, is distributed by the first water distributor 41 again and flows down along the first flow guide pipe 38, so that the liquid is recovered as much as possible and is fully separated.

Preferably, the first and second liquid collecting tanks 43 and 44 have the same height, and the lower surfaces of the first and second liquid collecting tanks 43 and 44 are abutted against each other so that there is no gap between the first and second liquid collecting tanks 43 and 44. It is further preferred that the first sump 43 and/or the second sump 44 are in contact with the inner wall of the falling film evaporator 37, i.e. that the first sump 43 and the second sump 44 divide the falling film evaporator into two areas, and that the heating 40 pipe is located in the lower evaporation zone, so that the steam in the evaporation zone cannot enter the upper guiding zone where the first guiding pipe 38 and the second guiding pipe 39 are located, thereby achieving separation of the feed from the steam.

Optionally, the surface material of the first flow guiding tube 38 is a material that has strong attraction with the polar liquid, such as glass, and drains the water phase, so that the oil phase vertically falls into the first liquid collecting tank 43, thereby separating the oil phase; the surface of the second flow guiding tube 39 is made of a material with strong attraction to the nonpolar liquid, such as plastic, and drains the oil phase, so that the water phase vertically drops into the second liquid collecting tank 44, and the water phase is separated. In practical application, the materials of the first flow guide 38 and the second flow guide 39 may be interchanged.

As a specific embodiment, the falling film evaporator 37 includes a first flow guiding pipe 38 and a second flow guiding pipe 39, and is arranged in an X-shape, a heating pipe 40 is respectively connected below the first flow guiding pipe 38 and the second flow guiding pipe 39 for film forming evaporation, the first flow guiding pipe 38 is a glass pipe and is used for drainage of water phase, and the second flow guiding pipe 39 is a plastic pipe and is used for drainage of oil phase; the top end of the first guide pipe 38 is connected with a first water distributor 41, the first water distributor 41 is connected with a feed inlet, a first liquid collecting tank 43 is arranged at the lower part of the first guide pipe 38, oil phase liquid vertically falls into the first liquid collecting tank 43 from the first guide pipe 38 while water phase is drained, and water phase flows down from a through hole of the first liquid collecting tank 43; the first liquid collecting tank 43 is obliquely arranged, the oil phase naturally flows to the first pump, flows back to the second water distributor 42 from the first pump and flows to the second guide pipe 39 from the second water distributor 42, and when the oil phase is guided, a small amount of water phase liquid vertically falls into the second liquid collecting tank 44 from the second guide pipe 39 and the oil phase flows down from the through hole of the second liquid collecting tank 44; the second liquid collecting tank 44 is obliquely arranged, the water phase naturally flows to the second pump, flows back to the first water distributor 41 from the second pump, and flows to the first guide pipe 38 from the first water distributor 41.

As another specific embodiment, the falling film evaporator 37 includes a row of first guide pipes 38 and a row of second guide pipes 39, and are arranged front and back and are in a plurality of X-shaped arrangements, the lower parts of the first guide pipes 38 and the second guide pipes 39 are respectively connected with heating pipes 40 for film forming evaporation, the first guide pipes 38 are plastic pipes and drain oil phases, and the second guide pipes 39 are glass pipes and drain water phases; the top end of the first guide pipe 38 is connected with a first water distributor 41, the first water distributor 41 is connected with a feed inlet, a first liquid collecting tank 43 is arranged at the lower part of the first guide pipe 38, and when the oil phase is guided, the water phase liquid vertically drops into the first liquid collecting tank 43 from the first guide pipe 38, and the oil phase flows down from a through hole of the first liquid collecting tank 43; the first liquid collecting tank 43 is obliquely arranged, the water phase naturally flows to the first pump, flows back to the second water distributor 42 from the first pump and flows to the second guide pipe 39 from the second water distributor 42, and when the water phase is drained, a small amount of oil phase liquid vertically falls into the second liquid collecting tank 44 from the second guide pipe 39 and the water phase flows down from the through hole of the second liquid collecting tank 44; the second liquid collecting tank 44 is arranged obliquely, the oil phase naturally flows to the second pump, flows back to the first water distributor 41 from the second pump, and flows to the first guide pipe 38 from the first water distributor 41.

As another specific embodiment, the falling film evaporator 37 includes a plurality of rows of first guide pipes 38 and a plurality of rows of second guide pipes 39, and are staggered in front and back, and are arranged in a plurality of rows of X-shapes, the bottoms of the first guide pipes 38 and the second guide pipes 39 are respectively connected with heating pipes 40 for film forming evaporation, the first guide pipes 38 are plastic pipes and drain oil phases, and the second guide pipes 39 are glass pipes and drain water phases; the first liquid collecting tank 43 and the second liquid collecting tank 44 are matched with the first flow guiding pipe 38 and the second flow guiding pipe 39 to be staggered front and back; the first water distributor 41 and the second water distributor 42 are also matched with the first guide pipe 38 and the second guide pipe 39 to be staggered back and forth.

The first flow guide pipe 38 and the second flow guide pipe 39 are arranged in an X shape, so that the heating pipes 40 below the first flow guide pipe 38 and the second flow guide pipe 39 are separated, liquids with different properties are formed into films and evaporated on the heating pipes 40 in respective areas, a separation plate 47 is arranged between the heating pipes connected with the first flow guide pipe 38 and the heating pipes connected with the second flow guide pipe 39 for separating water phase steam and oil phase steam, the top ends of the separation plate 47 are fixedly connected with the lower surfaces of the first liquid collecting tank 43 and the second liquid collecting tank 44, the evaporation area 45 is divided into a water phase steam area 48 and an oil phase steam area 49, and the water phase steam and the oil phase steam are respectively controlled in corresponding areas.

Optionally, a water phase steam outlet is arranged on the side wall of the falling film evaporator in the water phase steam zone 48, and an oil phase steam outlet is arranged on the side wall of the falling film evaporator in the oil phase steam zone 49.

For example, one or more rows of heating pipes 40 correspondingly connected below one or more rows of first guide pipes 38 are positioned at the left side of the interior of the falling film evaporator, wherein the rightmost one or more rows of heating pipes are denoted as R1, one or more rows of heating pipes 40 correspondingly connected below one or more rows of second guide pipes 39 are positioned at the right side of the interior of the falling film evaporator, wherein the leftmost one or more rows of heating pipes are denoted as R2, the separation plate 47 is arranged between the R1 and the R2, the top end of the separation plate 47 is fixedly connected with the lower surfaces of the first liquid collecting tank 43 and the second liquid collecting tank 44 to divide the falling film evaporator 37 into an evaporation area 45 and a guide area 46, the side edge of the separation plate 47 is fixedly connected with the side wall of the falling film evaporator to divide the evaporation area 45 into an aqueous phase vapor area 48 and an oil phase vapor area 49.

According to the falling film evaporator disclosed by the invention, the flow guide pipe is arranged above the heating pipe 40, the water phase and the oil phase in the chemical wastewater are separated by utilizing the difference of the attractive force of the water phase and the oil phase and the inclined flow guide pipes made of different materials, and the separated liquid flows to the heating pipes corresponding to the water phase and the oil phase to be evaporated. The first liquid collecting tank 43 and the second liquid collecting tank 44 are matched with the first guide pipe 38 and the second guide pipe 39, and the recovered liquid is separated again; the partition plate 47 is matched with the first liquid collecting tank 43 and the second liquid collecting tank 44 to divide the falling film evaporator 37 into a diversion area 46, a water phase steam area 48 and an oil phase steam area 49, so that different steam can be discharged through respective corresponding steam outlets, and secondary mixing is avoided. The invention improves the falling film evaporator 37, so that the falling film evaporator can directly feed without collecting waste water in advance and standing to separate the water phase and the oil phase, thereby being beneficial to a large-scale continuous production process.

Optionally, the evaporation heat source of the falling film evaporator 37 is provided by heat conduction oil of a heat conduction oil storage tank, a jacket is arranged around the outer wall of the falling film evaporator, an oil inlet is arranged at the bottom of the jacket, an oil outlet is arranged at the top of the jacket, the oil inlet and the oil outlet are connected with the heat conduction oil storage tank, and the heat conduction oil is introduced into the jacket for heating the wastewater in the falling film evaporator.

Optionally, a temperature controller is arranged in the jacket and used for controlling the heating temperature of the falling film evaporator.

Claims (4)

1. The chemical wastewater treatment and recycling device is characterized by comprising an evaporation kettle, a water diversion unit and a wastewater treatment unit which are sequentially connected, wherein the water diversion unit comprises a water diversion device, and a movable organic matter recovery device is arranged in the water diversion device and is used for recovering organic matters in the water diversion device;

the wastewater treatment unit comprises an electrocatalytic treatment device in the water separator and a secondary treatment device outside the water separator;

The water outlet pipeline of the wastewater treatment unit is connected in parallel with the first water distribution pipe of the evaporation kettle, the second water distribution pipe of the water diversion unit and the water inlet pipe of the secondary treatment device, and is respectively used for recycling the treated water to be used for wastewater salt crystallization and/or recrystallization and purification treatment in the evaporation kettle, electrocatalytic filler flushing and wastewater treatment filler regeneration;

The upper part of the evaporation kettle is provided with a first water distribution pipe which is connected with a water inlet of the evaporation kettle and is used for supplying water for salt crystallization and/or recrystallization and purification treatment of wastewater in the evaporation kettle;

The top of the evaporation kettle is provided with a steam outlet which is connected with a water separator of the water separation unit through a pipeline, and the steam evaporated by the wastewater is input into the water separation unit;

the evaporation kettle is provided with a first water return pipe, and one end of the first water return pipe is connected with a water inlet of the evaporation kettle;

the water diversion unit further comprises a condenser, and the top outlet of the water diversion unit is connected with the condenser through a pipeline;

The organic matter recovery device comprises a siphon pipe, a liquid suction port, a connecting device and a lifter, wherein one end of an inlet of the siphon pipe is arranged on the inner wall of the water separator and is communicated with the liquid suction port through the connecting device, one end of an outlet of the siphon pipe extends out of the water separator and is connected with the organic matter storage tank through a first control valve and a vacuum pump in sequence;

the liquid suction port is arranged on the lifter, and the lifter is used for controlling the height of the liquid suction port in the water separator;

The lifter comprises an electro-hydraulic push rod, a lifting frame and a positioning switch, wherein the electro-hydraulic push rod is fixed on the outer side wall of the water separator, a plunger head of the electro-hydraulic push rod is connected with the lifting frame, the lifting frame penetrates through the top surface of the water separator to extend into the water separator, a liquid suction port is arranged at the bottom of the lifting frame, and the liquid suction port is fixedly connected with the tail end of the connecting device;

The positioning switch is fixed on a connecting frame, and the connecting frame is fixed on the outer side wall of the water separator and is parallel to the moving direction of the plunger head of the electro-hydraulic push rod;

The positioning switch comprises an upper limiting block, a central limiting block and a lower limiting block, wherein the central limiting block can move up and down on the connecting frame, and a protruding clamping plate is arranged at the position of the plunger head corresponding to the positioning switch;

the electrocatalytic treatment device comprises an electrode filler and an electric controller, wherein the electrode filler is arranged at the lower part in the water separator, the electric controller is arranged outside the water separator and is connected with a power supply, and the second water distribution pipe is arranged above the electrode filler;

the water separator is provided with a second water return pipe, and one end of the second water return pipe is connected with a second water distribution pipe;

The secondary treatment device comprises a decoloring tank and an RO reverse osmosis device which are sequentially connected, the bottom of the water separator is provided with a discharge port and a second control valve, the discharge port is connected with a water inlet pipe at the bottom of the decoloring tank through a pipeline, and a plurality of zeolite filler layers which are uniformly fixed and are tightly connected with the inner wall of the decoloring tank are arranged in the decoloring tank;

the water outlet pipeline of the RO reverse osmosis device is connected with the reclaimed water storage tank.

2. The chemical wastewater treatment and recycling device according to claim 1, wherein a first three-way valve is arranged on the water inlet pipe of the decolorizing tank, a first end of the first three-way valve is connected with a pipeline connected with the second control valve, and a second end of the first three-way valve is connected with the water inlet at the bottom of the decolorizing tank through a circulating pump; the circulating pump is a rotor pump capable of running in forward and reverse directions;

The first end of the second three-way valve is connected with the water outlet pipe of the decolorizing tank, the third end of the first three-way valve is connected with the second end of the second three-way valve, and the third end of the second three-way valve is connected with the RO reverse osmosis device.

3. The chemical wastewater treatment and recycling device according to claim 2, wherein a third three-way valve is arranged between the RO reverse osmosis device and the reclaimed water storage tank, a first end of the third three-way valve is connected with the RO reverse osmosis device, a second end of the third three-way valve is connected with the reclaimed water storage tank, and a third end of the third three-way valve is respectively connected with a first return pipe of the evaporation kettle, a second return pipe of the water separator and a water inlet pipe of the decolorizing tank through recycling pipelines, flow meters and recycling valves arranged on the branch pipes and the recycling valves.

4. The chemical wastewater treatment and recycling apparatus according to claim 3, further comprising a falling film evaporator, wherein a discharge port of the falling film evaporator is connected with a water inlet of the evaporation kettle, and a water phase steam outlet of the falling film evaporator and a steam outlet at the top of the evaporation kettle are both connected with a water separator to input wastewater steam into the water separation unit.