CN113582386A - A effluent treatment plant for pigment production - Google Patents
A effluent treatment plant for pigment production Download PDFInfo
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- CN113582386A CN113582386A CN202110870481.1A CN202110870481A CN113582386A CN 113582386 A CN113582386 A CN 113582386A CN 202110870481 A CN202110870481 A CN 202110870481A CN 113582386 A CN113582386 A CN 113582386A
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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
- C02F1/5281—Installations for water purification using chemical agents
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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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a wastewater treatment device for pigment production, which comprises: an external housing; the filtering and cleaning assembly is vertically embedded and fixed on one side of the upper end face of the external base, the upper end face of the filtering and cleaning assembly is vertically communicated with a conveying pipe, and a drainage pipe is transversely communicated below one side of the filtering and cleaning assembly; the flocculation sedimentation component is transversely fixed on one side, far away from the filtering and cleaning component, in the outer base and communicated with the drainage pipe; and the outer discharge pipe transversely penetrates through the outer machine base and is arranged on one side, away from the filtering and cleaning component, of the outer machine base, one end of the outer discharge pipe is communicated with the flocculation and sedimentation component, and the other end of the outer discharge pipe is communicated with the peripheral neutralization pond.
Description
Technical Field
The invention belongs to the technical field of sewage treatment equipment, and particularly relates to a wastewater treatment device for pigment production.
Background
The pigment wastewater has the characteristics of high suspended matter, high COD, high chroma and difficult biochemical degradation of organic matters, and simultaneously has the problems of intermittent discharge, normal temperature and seasonal variation, large variation of water quality and water quantity with time and the like, and belongs to the difficult degradation industrial wastewater. The existing pigment production wastewater treatment method mainly comprises a biochemical method and a physicochemical method, while the pigment wastewater treatment device in the prior art mainly realizes filtering and deslagging on a water body through the self-flowing of the water body, but because the pigment wastewater treatment device is in a state of not being cleaned in work for a long time, filter holes are blocked, so that the wastewater flow is influenced, the solid-liquid separation effect is also influenced, and the wastewater filtering treatment efficiency is reduced to a certain extent; meanwhile, in the process of improving the water quality and settling, the precipitate in the pigment wastewater is still in a floating state due to the influence of standing time, so that the separation effect is difficult to achieve. Accordingly, those skilled in the art have provided a wastewater treatment apparatus for pigment production to solve the problems set forth in the background art described above.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a wastewater treatment plant for pigment production, comprising:
an external housing;
the filtering and cleaning assembly is vertically embedded and fixed on one side of the upper end face of the external base, the upper end face of the filtering and cleaning assembly is vertically communicated with a conveying pipe, and a drainage pipe is transversely communicated below one side of the filtering and cleaning assembly;
the flocculation sedimentation component is transversely fixed on one side, far away from the filtering and cleaning component, in the outer base and communicated with the drainage pipe; and
the outer discharge pipe transversely penetrates through one side, far away from the filtering and cleaning component, of the outer machine base, one end of the outer discharge pipe is communicated with the flocculation and sedimentation component, and the other end of the outer discharge pipe is communicated with an external neutralization pond;
the pigment production wastewater is intensively sent into the filtering and cleaning assembly through the conveying pipe for primary filtering treatment, so that slurry slag liquid and suspended particles in the pigment production wastewater can be filtered and removed in time, and the filtered pigment production wastewater is conveyed into the flocculation and sedimentation assembly through the drainage pipe for internal sedimentation, so that the water quality is improved; the improved pigment production wastewater is discharged and conveyed outwards through an outer discharge pipe and is conveyed to the next neutralization and disinfection process.
Further, preferably, the filter cleaning assembly includes:
an outer sealing cylinder;
the upper end seat is coaxially fixed on the outer sealing cylinder and communicated with the conveying pipe;
the mounting disc is coaxially embedded and fixed at the lower side in the outer sealing cylinder, and a plurality of discharge ports are formed in the mounting disc;
the filter cylinder part is coaxially arranged on the mounting disc in a way that the filter cylinder part can rotate relatively through a connecting rotor, the upper end of the filter cylinder part is rotatably connected with the upper end seat, a rotating motor is arranged in the outer sealing cylinder, and the output end of the rotating motor is connected with the filter cylinder part for transmission through a transmission tooth holder;
the hydraulic telescopic rods are arranged in a circumferential array mode and are vertically fixed on the outer sealing cylinder;
the filter hole cleaning device is correspondingly fixed at the output end of the hydraulic telescopic rod and is abutted and contacted with the filter cylinder piece, and the filter hole cleaning device is used for removing slag and cleaning filter hole positions on the filter cylinder piece at regular intervals; and
and the discharge pipe vertically penetrates through the lower part of the outer sealing cylinder, and one end of the discharge pipe is communicated with the filter cylinder piece.
Further, preferably, the filter cartridge is constructed in a truncated cone-shaped structure, and the upper end section thereof is larger than the lower end section thereof.
Further, preferably, the method further comprises: the hinge shaft seat is vertically fixed on the hydraulic telescopic rod, the filtering hole cleaning device can be arranged on the hinge shaft seat in a relatively deflection mode, and a plurality of supporting springs are connected between the filtering hole cleaning device and the hinge shaft seat.
Further, preferably, the filter hole cleaning device includes:
the airflow discharge port is communicated with an external air supply pump;
the bus bar cavities are constructed into arc-shaped inner wall structures and are uniformly arranged, and one end of each bus bar cavity is communicated with the airflow row port through an inner branch pipe;
the water supply pipe is sequentially arranged in the bus-bar cavity in a penetrating way and used for injecting water into the bus-bar cavity for supplying water;
the flow guide piece is coaxially arranged in the bus bar cavity and is constructed into a semicircular structure;
the discharge pipe bodies are communicated with the busbar cavities in a one-to-one correspondence manner, and one end of each discharge pipe body is vertically close to the filtering hole of the filtering cylinder piece; and
and the spongy cushion is sleeved outside the discharge pipe and is abutted and contacted with the filter cylinder piece.
Further, as a preferred option, a flow gathering piece is arranged in the discharging pipe body, an arc-shaped outer cavity is fixed at one end of the discharging pipe body in an embedded mode, the arc-shaped outer cavity is coaxially fixed in the blocking piece, and the outer wall of the blocking piece is corrugated.
Further, as a preference, the flocculation and sedimentation assembly comprises:
the outer seal frame body;
the upper liquid storage tank is transversely erected on the upper side inside the outer seal frame body, and the upper end of the upper liquid storage tank is communicated with a delivery seat;
the lower sedimentation tank is transversely erected inside the outer seal frame body and is positioned below the upper liquid storage tank, and the upper end of the lower sedimentation tank is communicated with the upper liquid storage tank through a plurality of telescopic guide pipes; and
and the side connecting springs are symmetrically arranged between the lower settling tank and the outer seal frame body.
Further, preferably, a rotating disc is further rotatably arranged on the lower end face of the outer seal frame body, a telescopic adjusting rod is vertically fixed below the lower settling tank, and one end of the telescopic adjusting rod is hinged with the rotating disc.
Compared with the prior art, the invention has the beneficial effects that:
particularly aiming at the low-efficiency low-emission phenomenon in the early stage of pigment wastewater treatment, one side of an external machine base is provided with a filtering and cleaning component, the filtering and cleaning component is used for carrying out primary filtering treatment on pigment production wastewater and periodically cleaning a filtering cylinder piece after filtering operation, so that particle impurities in the pigment wastewater are prevented from blocking a filtering hole position to influence the filtering and separating of the device; and pigment waste water after filtering can carry out inside sediment via the flocculation and sedimentation subassembly, in this, for the sedimentation rate and the settlement effect that improve pigment waste water, the last reservoir of standing still relatively through being in the top mixes by flocculation, make the suspended particles after mixing sink in the lower precipitation tank, provide high frequency low range hybrid for the pigment waste water in the precipitation tank down by the continuous rotation effect of rotary disk, so that the suspended particles in the pigment waste water collect the sediment, thereby make outer calandria can be external discharge with the pigment waste water in last reservoir in advance, improve the precipitation effect.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a filter element according to the present invention;
FIG. 3 is a schematic view showing a construction of a hinge shaft according to the present invention;
FIG. 4 is a schematic structural view of a filter hole cleaning apparatus according to the present invention;
FIG. 5 is a schematic view of a partial structure of the discharge pipe of the present invention;
FIG. 6 is a schematic structural view of a flocculation and sedimentation assembly of the present invention;
in the figure: the device comprises an external machine base 1, a delivery pipe 2, a filtration cleaning assembly 3, an external sealing cylinder 301, an upper end seat 302, a mounting disc 303, a filtering cylinder 304, a transmission gear seat 305, a hydraulic telescopic rod 306, a discharge pipe 307, a hinge shaft seat 308, a support spring 309, a discharge pipe 4, a flocculation settling assembly 5, an external sealing frame 501, an upper liquid storage tank 502, a delivery seat 503, a sedimentation settling tank 504, a side connecting spring 505, a rotating disc 506, an external discharge pipe 6, a filtering hole cleaning device 7, an airflow discharge port 701, a bus bar chamber 702, a water supply pipe 703, a delivery pipe 704, a flow guide 705, a sponge cushion 706, a flow gathering member 707, an arc-shaped external cavity 709 and a blocking member 708.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a wastewater treatment apparatus for pigment production includes:
an outer housing 1;
the filtering and cleaning assembly 3 is vertically embedded and fixed on one side of the upper end face of the external base 1, the upper end face of the filtering and cleaning assembly 3 is vertically communicated with the conveying pipe 2, and a drainage pipe 4 is transversely communicated below one side of the filtering and cleaning assembly 3;
the flocculation sedimentation component 5 is transversely fixed on one side, far away from the filtering and cleaning component 3, in the outer machine base 1, and the flocculation sedimentation component 5 is communicated with the drainage pipe 4; and
the outer discharge pipe 6 transversely penetrates through one side, far away from the filtering and cleaning component 3, of the outer machine base 1, one end of the outer discharge pipe 6 is communicated with the flocculation sedimentation component 5, and the other end of the outer discharge pipe 6 is communicated with an external neutralization pond (not shown in the figure);
pigment production wastewater is intensively sent into the filtering and cleaning assembly 3 through the conveying pipe 2 for primary filtering treatment, meanwhile, after long-term filtering use, the filtering and cleaning assembly can regularly clean a filtering barrel part inside the filtering and cleaning assembly, filter hole blockage is prevented from influencing filtering efficiency and solid-liquid separation effect, slurry slag liquid and suspended particles in the pigment production wastewater can be filtered and removed in time, and the filtered pigment production wastewater is conveyed into the flocculation and sedimentation assembly 5 through the drainage pipe 4 for internal sedimentation, so that water quality improvement is realized; the improved pigment production wastewater is discharged through an outer discharge pipe 6 and sent to the next neutralization and disinfection process.
Referring to fig. 2, in the present embodiment, the filter cleaning assembly 3 includes:
an outer seal barrel 301;
the upper end seat 302 is coaxially fixed on the outer sealing cylinder 301 and communicated with the conveying pipe 2;
the mounting disc 303 is coaxially embedded and fixed at the lower side of the inner part of the outer sealing cylinder 301, and a plurality of discharge ports are formed in the mounting disc 303;
the filter cylinder part 304 is coaxially arranged on the mounting disc 303 and can relatively rotate through a connecting rotor, the upper end of the filter cylinder part 304 is rotatably connected with the upper end seat 302, a rotating motor is arranged in the outer sealing cylinder 301, and the output end of the rotating motor is in transmission connection with the filter cylinder part 304 through a transmission tooth seat 305; centrifugal force is provided by the rotation of the filter cylinder piece, so that the solid-liquid separation rate is improved, and the filtration treatment is accelerated;
a plurality of hydraulic telescopic rods 306 are arranged in a circumferential array, and each hydraulic telescopic rod 306 is vertically fixed on the outer sealing cylinder 301;
the filter hole cleaning device 7 is correspondingly fixed at the output end of the hydraulic telescopic rod 306 and is abutted against and contacted with the filter cylinder 304, and the filter hole cleaning device 7 is used for removing slag and cleaning filter hole positions on the filter cylinder 304 periodically; in particular, cleaning work can be performed for each filter hole site one by one, and
and a discharge pipe 307 vertically penetrating below the outer sealing cylinder 301, wherein one end of the discharge pipe 307 is communicated with the filter cylinder member 304.
In a preferred embodiment, the filter cartridge 304 is constructed in a truncated cone shape, and has a cross section larger at its upper end than at its lower end, so that most of the particulate impurities in the pigment waste water can be deposited on the lower side of the filter cartridge.
Referring to fig. 3, in the present embodiment, the method further includes: the hinge shaft seat 308 is vertically fixed on the hydraulic telescopic rod 306, the filtering hole cleaning device 7 can be arranged on the hinge shaft seat 308 in a relatively deflected mode, and a plurality of supporting springs 309 are connected between the filtering hole cleaning device 7 and the hinge shaft seat 308, so that the filtering hole cleaning device can be always attached to and contacted with the filtering barrel.
Referring to fig. 4, in the present embodiment, the filter hole cleaning device 7 includes:
the airflow discharge port 701 is communicated with an external air supply pump;
a plurality of bus bar cavities 702, which are configured into an arc-shaped inner wall structure and are uniformly arranged, wherein one end of each bus bar cavity 702 is communicated with the airflow outlet 701 through an inner branch pipe;
the water supply pipe 703 sequentially penetrates through the bus bar cavity 702 and injects water into the bus bar cavity 702 for flow supply;
a flow guide 705 coaxially disposed within the bus bar cavity 705 and configured in a semicircular structure; when the airflow outlet injects high-pressure gas into the busbar cavity through the inner branch pipe, the flow guide part can divide the airflow outlet into two homodromous branches, the water supply part synchronously supplies water, and the high-pressure gas and injected water flow are converged, so that meshes can be conveniently cleaned one by one;
the discharge pipe bodies 704 are communicated with the bus bar cavities 702 in a one-to-one correspondence manner, and one end of each discharge pipe body 704 is vertically close to the filtering hole of the filtering cylinder part 304; and
and the sponge cushion 706 is sleeved outside the discharge pipe body 704 and is abutted and contacted with the filter cylinder part 304.
Referring to fig. 5, in this embodiment, a flow collecting member 707 is disposed in the discharge pipe 704, an arc outer cavity 708 is fixed to one end of the discharge pipe 704 in an embedded manner, the arc outer cavity 708 is coaxially fixed to a blocking member 709, and the structural outer wall of the blocking member 709 is corrugated, so that water can be vertically sprayed in a filtering hole position in a diffusion state under the flow guiding effect of the blocking member, and particularly, the water can be directed at the filtering hole position with an arc-shaped cross section, so that filter residues adhered to the periphery of the inner wall of the cross section can be timely discharged.
Referring to fig. 6, as a preferred embodiment, the flocculation and sedimentation assembly 5 comprises:
an outer seal holder body 501;
the upper liquid storage tank 502 is transversely erected on the upper side inside the outer seal frame body 501, and the upper end of the upper liquid storage tank 502 is communicated with a delivery seat 503;
the lower sedimentation tank 504 is transversely erected inside the outer seal frame body 501 and is positioned below the upper liquid storage tank 502, and the upper end of the lower sedimentation tank 504 is communicated with the upper liquid storage tank 502 through a plurality of telescopic guide pipes; so that the pigment waste water can be preliminarily flocculated and settled in the upper liquid storage tank, settled particles can enter the lower settling tank to be collected, and
and the side connecting springs 505 are symmetrically arranged between the lower settling tank 504 and the outer seal holder body 501.
In this embodiment, one of the lower end surfaces of the outer seal holder body 501 is further rotatably provided with a rotating disk 506, a telescopic adjusting rod is vertically fixed below the lower settling tank 504, one end of the telescopic adjusting rod is hinged to the rotating disk 506, and high-frequency low-amplitude swing can be effectively provided for the lower settling tank, so that settling substances in the lower settling tank can be effectively collected, and the standing work of the upper liquid storage tank can not be influenced.
Specifically, in pigment wastewater treatment, pigment production wastewater is conveyed into a filter cylinder piece through a conveying pipe, the filter cylinder piece is driven to rotate by a rotating motor and preliminarily filtered, the filtered pigment production wastewater is conveyed into a flocculation sedimentation component through a drainage pipe and is provided with a standing space through an upper liquid storage tank, sedimentation particles can enter a lower sedimentation tank to be collected, sedimentation substances are effectively collected under the action of high-frequency low-amplitude left-right swinging of the lower sedimentation tank, and the pigment production wastewater in the upper liquid storage tank is discharged outwards through a drainage pipe after a period of time and enters the next neutralization and disinfection process; and after the filtration work many times, filtration pore cleaning device can be used for clearing up each filter screen hole site of filter cartridge spare one by one, guarantees its back separation work efficiency.
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 person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A effluent treatment plant for pigment production which characterized in that: it includes:
an outer housing (1);
the filtering and cleaning assembly (3) is vertically embedded and fixed on one side of the upper end face of the external base (1), the upper end face of the filtering and cleaning assembly (3) is vertically communicated with the conveying pipe (2), and a drainage pipe (4) is transversely communicated below one side of the filtering and cleaning assembly (3);
the flocculation sedimentation component (5) is transversely fixed on one side, far away from the filtering and cleaning component (3), in the outer machine base (1), and the flocculation sedimentation component (5) is communicated with the drainage pipe (4); and
the outer discharge pipe (6) transversely penetrates through one side, far away from the filtering and cleaning component (3), of the outer machine base (1), one end of the outer discharge pipe (6) is communicated with the flocculation sedimentation component (5), and the other end of the outer discharge pipe (6) is communicated with an external neutralization pond;
the pigment production wastewater is intensively sent into the filtering and cleaning component (3) through the conveying pipe (2) for primary filtering treatment, so that slurry slag liquid and suspended particles in the pigment production wastewater can be filtered and removed in time, and the filtered pigment production wastewater is conveyed into the flocculation and sedimentation component (5) through the drainage pipe (4) for internal sedimentation to improve the water quality; the improved pigment production wastewater is discharged to the outside through an external discharge pipe (6) and sent to the next neutralization and disinfection process.
2. The wastewater treatment plant for pigment production according to claim 1, characterized in that: the filter cleaning assembly (3) comprises:
an outer seal cylinder (301);
the upper end seat (302) is coaxially fixed on the outer sealing cylinder (301) and communicated with the conveying pipe (2);
the mounting disc (303) is coaxially embedded and fixed on the lower side of the inner part of the outer sealing cylinder (301), and a plurality of discharge ports are formed in the mounting disc (303);
the filter cylinder part (304) is coaxially arranged on the mounting disc (303) and can relatively rotate through being connected with a rotor, the upper end of the filter cylinder part (304) is rotatably connected with the upper end seat (302), a rotating motor is arranged in the outer sealing cylinder (301), and the output end of the rotating motor is in transmission connection with the filter cylinder part (304) through a transmission tooth seat (305);
the hydraulic telescopic rods (306) are arranged in a circumferential array mode, and each hydraulic telescopic rod (306) is vertically fixed on the outer sealing cylinder (301);
the filter hole cleaning device (7) is correspondingly fixed at the output end of the hydraulic telescopic rod (306) and is abutted against and contacted with the filter cylinder piece (304), and the filter hole cleaning device (7) is used for removing slag and cleaning filter hole positions on the filter cylinder piece (304) periodically; and
and the discharge pipe (307) vertically penetrates below the outer sealing cylinder (301), and one end of the discharge pipe (307) is communicated with the filter cylinder piece (304).
3. The wastewater treatment plant for pigment production according to claim 2, characterized in that: the filter cartridge (304) is configured as a truncated cone-shaped structure with an upper end cross-section greater than a lower end cross-section.
4. A wastewater treatment plant for pigment production according to claim 3, characterized in that: further comprising: the hinge shaft seat (308) is vertically fixed on the hydraulic telescopic rod (306), the filter hole cleaning device (7) can be arranged on the hinge shaft seat (308) in a relatively deflected mode, and a plurality of supporting springs (309) are connected between the filter hole cleaning device (7) and the hinge shaft seat (308).
5. The wastewater treatment plant for pigment production according to claim 4, characterized in that: the filter hole cleaning device (7) comprises:
the air flow discharge port (701) is communicated with an external air supply pump;
the bus bar cavities (702) are constructed into an arc-shaped inner wall structure and are uniformly arranged in a plurality, and one end of each bus bar cavity (702) is communicated with the airflow outlet (701) through an inner branch pipe;
the water supply pipe (703) is sequentially arranged in the bus bar cavity (702) in a penetrating way and is used for injecting water and supplying flow to the bus bar cavity (702);
a flow guide (705) coaxially disposed within the bus bar cavity (705) and configured in a semicircular configuration;
the discharge pipe body (704) is communicated with the bus bar cavity (702) in a one-to-one correspondence mode, and one end of the discharge pipe body (704) is vertically close to the filtering hole of the filtering cylinder piece (304); and
and the sponge cushion (706) is sleeved outside the discharge pipe body (704) and is abutted and contacted with the filter cylinder part (304).
6. The wastewater treatment plant for pigment production according to claim 5, characterized in that: the drainage pipe body (704) is internally provided with a flow gathering piece (707), one end of the drainage pipe body (704) is embedded and fixed with an arc-shaped outer cavity (708), the arc-shaped outer cavity (708) is internally and coaxially fixed with a blocking piece (709), and the structural outer wall of the blocking piece (709) is corrugated.
7. The wastewater treatment plant for pigment production according to claim 2, characterized in that: the flocculation and sedimentation assembly (5) comprises:
an outer seal frame body (501);
the upper liquid storage tank (502) is transversely erected on the upper side inside the outer seal frame body (501), and the upper end of the upper liquid storage tank (502) is communicated with a delivery seat (503);
the lower sedimentation tank (504) is transversely erected in the outer seal frame body (501) and is positioned below the upper liquid storage tank (502), and the upper end of the lower sedimentation tank (504) is communicated with the upper liquid storage tank (502) through a plurality of telescopic guide pipes; and
and the side connecting springs (505) are symmetrically arranged between the lower settling tank (504) and the outer seal frame body (501) in a left-right mode.
8. The wastewater treatment plant for pigment production according to claim 7, characterized in that: the lower end face of the outer seal frame body (501) is further rotatably provided with a rotating disc (506), a telescopic adjusting rod is vertically fixed below the lower settling tank (504), and one end of the telescopic adjusting rod is hinged to the rotating disc (506).
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| CN202110870481.1A CN113582386B (en) | 2021-07-30 | 2021-07-30 | A effluent treatment plant for pigment production |
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| CN202110870481.1A CN113582386B (en) | 2021-07-30 | 2021-07-30 | A effluent treatment plant for pigment production |
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