CN113860576A - Wastewater treatment device, and operation method and application thereof - Google Patents
Wastewater treatment device, and operation method and application thereof Download PDFInfo
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- CN113860576A CN113860576A CN202111339669.XA CN202111339669A CN113860576A CN 113860576 A CN113860576 A CN 113860576A CN 202111339669 A CN202111339669 A CN 202111339669A CN 113860576 A CN113860576 A CN 113860576A
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02F2101/101—Sulfur compounds
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
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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
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Abstract
The invention provides a wastewater treatment device, an operation method and application thereof, wherein the wastewater treatment device comprises a raw water tank, a pretreatment device, a reverse osmosis membrane device, an ion exchange unit and an online water quality monitoring device, wherein the ion exchange unit comprises an anion exchanger connected with an alkali storage tank and a cation exchanger connected with an acid storage tank, raw water output by the raw water tank is treated by the pretreatment device and the reverse osmosis membrane device, then water quality monitoring and classification are carried out, purified water is obtained for recovery, concentrated water is treated by the cation exchanger and the anion exchanger in sequence and then is subjected to wastewater index monitoring by the online water quality monitoring device, and the concentrated water can be directly discharged according with requirements; if not meeting the requirement, the wastewater is recycled to the reverse osmosis membrane device for secondary treatment. In the invention, COD, BOD, chromaticity, virus, organic matters, heavy metal ions and the like in the comprehensive wastewater in the laboratory can be effectively removed through the grading treatment process, and the method has the advantages of high automation degree, good treatment effect, recycling of treated water, environmental protection and energy saving.
Description
Technical Field
The invention belongs to the technical field of water treatment, relates to a wastewater treatment device, and particularly relates to a wastewater treatment device, an operation method and application thereof.
Background
With the continuous development of industrialization and urbanization, the problems of urban domestic sewage and industrial wastewater become more and more severe, and in the process of accelerating the construction and the transformation of urban sewage treatment facilities, the market demand of sewage treatment becomes more and more obvious, and laboratory wastewater is one of the wastewater with higher treatment difficulty. The sewage discharged by the laboratories of scientific research units, universities and colleges and detection institutions in various cities has the characteristics of discontinuity, less quantity, complex pollutant components and strong harmfulness. Most of the conventional laboratory wastewater is discharged together with domestic sewage into a sewer, so that the environment is polluted; high-concentration and high-hazard experimental sewage and solid waste are generally collected, stored and handed to a professional third party for treatment, so that higher treatment cost is generated; some laboratories can carry out acid-base neutralization, flocculation, precipitation separation and oxidation pretreatment on pollutants in a sewage system through a regulation and storage tank and then enter a sewer, and the pretreated wastewater cannot be reused.
CN206266367U discloses an ion exchange resin and ion exchange membrane integrated demineralized water treatment system, which comprises a raw water tank, a filtering unit, an ion type resin unit, a pressure type membrane unit, an ion exchange resin and an ion exchange membrane coupling unit; the ion type resin unit is arranged between the activated carbon filter and the cartridge filter and comprises a weak acid cation exchange bed and a resin catcher; raw water output by the raw water tank sequentially enters an activated carbon filter, a weak acid cation exchange bed, a resin catcher, a cartridge filter, a pressure type membrane unit and an ion exchange resin and ion exchange membrane coupling unit to obtain desalted water. The system utilizes the pre-load reduction effect of the ionic resin to slow down the crushing phenomenon caused by frequent regeneration of the resin in the coupling technology, simultaneously prolongs the filter element replacement frequency of the cartridge filter, avoids scaling of a multi-stage reverse osmosis device and improves the overall benefit of the system.
CN110104865A discloses a waste water zero discharge system and method that can realize spent acid, waste alkali, crystallization salt resourceization, waste water zero discharge system is including the cation exchange resin system and the anion exchange resin system that connect gradually: the waste liquid outlet of the cation exchange resin system is connected to a regenerated waste acid treatment system, and the waste liquid outlet of the anion exchange resin system is connected to a regenerated waste alkali treatment system: the waste liquid outlet of the waste acid regeneration treatment system and the waste alkali regeneration treatment system is connected to the waste water treatment system, the outlet of the waste water treatment system is connected to the reverse osmosis membrane system, the waste liquid outlet of the reverse osmosis membrane system is connected to the strong brine nanofiltration salt separation system, and the strong brine nanofiltration salt separation system is connected to the monovalent salt evaporation system and the multivalent salt evaporation system respectively. The invention has reasonable process and stable system operation, and can realize resource recycling of waste acid, waste alkali and crystal salt while generating high-quality pure water.
CN107200419A discloses a boiler make-up water treatment system, which comprises a raw water tank, a pretreatment system and an ion exchange system; the ion exchange system comprises a cation bed, an intermediate water tank, an anion bed and a demineralized water tank, wherein the intermediate water tank is provided with a carbon remover, and the cation bed and the anion bed are respectively connected with an acid regeneration system and an alkali regeneration system; the top of the cation bed is connected with a cation bed cleaning tower, the bottom of the cation bed is connected with the cation bed cleaning tower, the cation bed cleaning tower is connected with a pretreatment system, and the cation bed cleaning tower is respectively connected with an acid regeneration system and an intermediate water tank; the top of the anion bed is connected with the anion bed cleaning tower, the bottom of the anion bed is connected with the anion bed cleaning tower, the anion bed cleaning tower is connected with the pretreatment system, and the anion bed cleaning tower is connected with the alkali regeneration system.
At present, to the waste water of the different grade type pollutant composition that each trade laboratory produced and concentration, the degree of depth that has waste water treatment technique is not enough, and degree of automation is low, and the treatment effect is unsatisfactory, actual problem such as water resource secondary utilization rate is not high, consequently, need to design and develop a effluent treatment plant urgently, when satisfying the demand of actual production life, can also reach degree of automation height, the treatment effect is good, area is little and the purpose of environmental protection and energy saving.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a wastewater treatment device, an operation method and application thereof, wherein COD, BOD, chromaticity, viruses, organic matters, heavy metal ions and the like in laboratory comprehensive wastewater can be effectively removed through a grading treatment process, and the wastewater treatment device has the advantages of high automation degree, good treatment effect, small occupied area, simple and convenient operation and management, no need of special personnel on duty, reuse of treated water, environmental protection and energy conservation.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a wastewater treatment device, which comprises a raw water tank, a pretreatment device, a reverse osmosis membrane device, an ion exchange unit and an online water quality monitoring device, wherein the pretreatment device comprises a quartz sand filter and an activated carbon filter, the ion exchange unit comprises an anion exchanger connected with an alkali storage tank and a cation exchanger connected with an acid storage tank, raw water output by the raw water tank is subjected to water quality monitoring and classification after being treated by the pretreatment device and the reverse osmosis membrane device, purified water is obtained and recovered, and obtained concentrated water is subjected to treatment by the cation exchanger and the anion exchanger in sequence and then is subjected to wastewater index monitoring by the online water quality monitoring device, and can be directly discharged according with requirements; if not meeting the requirement, the wastewater is recycled to the reverse osmosis membrane device for secondary treatment.
In the invention, COD, BOD, chromaticity, virus, organic matters, heavy metal ions and the like in the comprehensive wastewater in the laboratory can be effectively removed through the grading treatment process, and the invention has the advantages of high automation degree, good treatment effect, small occupied area, simple and convenient operation and management, no need of special attendance, recycling of treated water, environmental protection and energy saving.
It should be noted that the water quality on-line monitoring device of the invention adopts a multi-parameter water quality on-line monitor to monitor the water quality condition in the treated water flow path in real time, the measured value and the limited value of the multi-parameter can be seen on the display screen, the waste water enters the recovery water tank through the automatic valve according with the reuse requirement of the waste water, and a small amount of waste water generated by the system meets the national sewage comprehensive discharge standard, namely is discharged into the municipal sewage pipe network.
The pretreatment device comprises a quartz sand filter and an activated carbon filter, wherein the quartz sand filter is mainly used for removing substances such as suspended matters, particulate matters, colloid and the like in raw water, simultaneously plays a role in reducing turbidity and chromaticity in the raw water, can filter visible matters such as particles and algae and the like brought by the raw water, is a powerful protection screen for the later-stage RO, can better remove suspended matters or non-soluble particles (oxides, turbidity, particulate matters and the like) in the water, has the characteristics of low cost, convenience in operation, maintenance, management and the like, and particularly has a good effect on reducing turbidity, pollution index and the like in the raw water. The activated carbon filter is mainly used for decoloring and removing residual chlorine, organic chlorine, ammonia nitrogen, nitrite and trace pollutants in water, such as pesticides, insecticides, chlorinated hydrocarbons, aromatic compounds, BOD (biochemical oxygen demand), COD (chemical oxygen demand) and the like, and has a removing effect on trace heavy metal ions (such as mercury ions, chromium ions and the like), synthetic detergents, radioactive substances and the like.
As a preferable technical scheme, the wastewater treatment device further comprises a pressure detection unit, and the pressure detection unit is respectively arranged at each connection part of the raw water tank, the pretreatment device, the reverse osmosis membrane device, the ion exchange unit and the water quality on-line monitoring device.
As a preferable technical solution of the present invention, each of the joints is provided with an automatic valve control unit.
As a preferable technical scheme, the wastewater treatment device adopts a PLC programming system to realize full-automatic wastewater treatment.
The PLC programming system display parameters comprise the original water tank water level, the membrane material service life, the accessory replacement reminding, the water leakage alarm and the automatic cleaning setting.
The PLC programming system comprises a programmable controller and a display device, and the operation of each module of the system is controlled by setting a program, so that the full-automatic and visual operation is realized, and the special person is not required to watch.
As a preferred technical solution of the present invention, the reverse osmosis membrane device is a two-stage reverse osmosis membrane module device.
The two-stage reverse osmosis membrane component device is designed, the membrane adopts a low-pressure composite membrane, high-efficiency filtration of large wastewater treatment capacity can be realized, water subjected to reverse osmosis treatment can remove most of inorganic salts, organic matters, microorganisms and the like, a core effect is exerted in a wastewater treatment system, the desalination rate of the wastewater is not less than 98%, purified water subjected to reverse osmosis membrane treatment is recycled, water for laboratories can be circularly supplied, and energy conservation and emission reduction are realized.
As a preferable technical scheme of the invention, a concentrated water tank is arranged between the reverse osmosis membrane device and the ion exchange unit and is used for receiving concentrated water obtained by treating raw water by the reverse osmosis membrane device.
It should be noted that, in the invention, the ion exchanger exchanges anions and cations in water to the resin, the resin recovers the exchange function through regeneration, the replaced anions and cations enter the reverse osmosis membrane module again for treatment, the discharged water reaches the standard and is discharged, and the hardness of the discharged water is obviously reduced. When the resin is invalid, the acid storage tank automatically feeds acid to regenerate the cation exchanger, the alkali storage tank automatically feeds alkali to regenerate the anion exchanger, and the regeneration can be automatically completed.
As a preferable technical scheme, a water pumping device is arranged among the raw water tank, the pretreatment device and the reverse osmosis membrane device, and a water pumping device is arranged between the concentrated water tank and the ion exchange unit.
The water pumping device is a water pump.
As a preferable technical scheme, an online water quality monitoring device is arranged between the ion exchange unit and the reverse osmosis membrane device.
In a second aspect, the present invention provides a method of operating the wastewater treatment plant of the first aspect, the method comprising:
the raw water output by the raw water tank is treated by the pretreatment device and the reverse osmosis membrane device, then water quality monitoring and classification are carried out, purified water is obtained and recovered, the obtained concentrated water is treated by the cation exchanger and the anion exchanger in sequence, and then the wastewater index is monitored by the water quality on-line monitoring device, so that the concentrated water can be directly discharged according to the requirement; if the water quality is not qualified, the water is circulated to the reverse osmosis membrane device for treatment again, the water is discharged after the water quality is monitored to reach the standard, the acid storage tank automatically adds acid to regenerate the cation exchanger, and the alkali storage tank automatically adds alkali to regenerate the anion exchanger.
In a third aspect, the present invention provides the use of a wastewater treatment plant of the first aspect in the field of laboratory integrated wastewater treatment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the whole treatment process is full-automatic, when the raw water is low in pressure/lack of water or the concentrated water tank is full of water, the system is automatically stopped, and when the pressure is recovered/the raw water tank is high in water level or the concentrated water is low in water level, the system is automatically started;
(2) the pretreatment is controlled by a full-automatic multi-way valve, and is set according to the operation instruction of the valve, so that periodic flushing is carried out, and the normal operation of equipment is ensured;
(3) reverse osmosis membrane separation system: can effectively intercept and dissolve salts, colloids, microorganisms, organic matters and the like, the desalination rate reaches more than 99.8 percent, the conductivity of effluent reaches less than 5 mu s/cm, and effluent of the system is recycled for a detection or cleaning system;
(4) the system can be operated by a PLC programmable control system (an extensible remote monitoring and operating system) and operated fully automatically according to the program set by a PLC controller and the parameters set by an automatic control instrument, and multi-stage automatic online monitoring is realized without special persons. The discharged water after the system treatment is discharged after relevant indexes of the discharged water after monitoring meet the national comprehensive sewage discharge standard;
in the invention, COD, BOD, chromaticity, virus, organic matters, heavy metal ions and the like in the comprehensive wastewater in the laboratory can be effectively removed through the grading treatment process, and the invention has the advantages of high automation degree, good treatment effect, small occupied area, simple and convenient operation and management, no need of special attendance, recycling of treated water, environmental protection and energy saving.
Drawings
FIG. 1 is a schematic view of a process flow of a wastewater treatment plant according to an embodiment of the present invention;
wherein, 1-raw water tank; 2-a pressure detection unit; 3, a water pump; 4-an automatic valve control unit; 5-quartz sand filter; 6-an activated carbon filter; 7, a reverse osmosis membrane component I; 8-a reverse osmosis membrane component II; 9-a water quality on-line monitoring device; 10-a purified water recovery tank; 11-a concentrated water tank; 12-a cation exchanger; 13-acid storage tank; 14-an anion exchanger; 15-alkali storage tank.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It should be understood by those skilled in the art that the present invention necessarily includes necessary piping, conventional valves and general pump equipment for achieving the complete process, but the above contents do not belong to the main inventive points of the present invention, and those skilled in the art can select the layout of the additional equipment based on the process flow and the equipment structure, and the present invention is not particularly limited to this.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In a specific embodiment, the present invention provides a wastewater treatment apparatus, as shown in fig. 1, the wastewater treatment apparatus comprises a raw water tank 1, a pretreatment apparatus, a reverse osmosis membrane apparatus, an ion exchange unit and an online water quality monitoring apparatus 9, the pretreatment apparatus comprises a quartz sand filter 5 and an activated carbon filter 6, the ion exchange unit comprises an anion exchanger 14 connected with an alkali storage tank 15 and a cation exchanger 12 connected with an acid storage tank 13, raw water output from the raw water tank 1 is treated by the pretreatment apparatus and the reverse osmosis membrane apparatus, then water quality monitoring and classification are performed, purified water is recovered, obtained concentrated water is treated by the cation exchanger 12 and the anion exchanger 14 in sequence, and then wastewater indexes are monitored by the online water quality monitoring apparatus 9, and the wastewater can be directly discharged according to requirements; if not meeting the requirement, the wastewater is recycled to the reverse osmosis membrane device for secondary treatment.
In the invention, COD, BOD, chromaticity, virus, organic matters, heavy metal ions and the like in the comprehensive wastewater in the laboratory can be effectively removed through the grading treatment process, and the invention has the advantages of high automation degree, good treatment effect, small occupied area, simple and convenient operation and management, no need of special attendance, recycling of treated water, environmental protection and energy saving.
It should be noted that the water quality on-line monitoring device 9 of the invention adopts a multi-parameter water quality on-line monitor to monitor the water quality condition in the treated water flow path in real time, the measured value and the limited value of the multi-parameter can be seen on the display screen, the waste water enters the recovery water tank through the automatic valve according with the reuse requirement of the waste water, and a small amount of waste water generated by the system meets the national sewage comprehensive discharge standard, namely is discharged into the municipal sewage pipe network.
It should be noted that the pretreatment device in the present invention includes a quartz sand filter 5 and an activated carbon filter 6, wherein the quartz sand filter 5 is mainly used for removing substances such as suspended substances, particulate matters, and colloids from raw water, and simultaneously plays a role in reducing turbidity and chromaticity in the raw water, and can filter out visible substances such as particles and algae from the raw water, and is a powerful protection screen for the subsequent RO, and can better remove suspended substances or non-soluble particles (oxides, turbidity, particulate matters, etc.) in water, and the pretreatment device has the characteristics of low cost, convenient operation, maintenance, convenient management, and the like, and particularly has a good effect in reducing turbidity, pollution index, and the like in the raw water. The activated carbon filter is mainly used for decoloring and removing residual chlorine, organic chlorine, ammonia nitrogen, nitrite and trace pollutants in water, such as pesticides, insecticides, chlorinated hydrocarbons, aromatic compounds, BOD (biochemical oxygen demand), COD (chemical oxygen demand) and the like, and has a removing effect on trace heavy metal ions (such as mercury ions, chromium ions and the like), synthetic detergents, radioactive substances and the like.
The wastewater treatment device also comprises a pressure detection unit 2, wherein the pressure detection unit 2 is respectively arranged at each joint of the raw water tank 1, the pretreatment device, the reverse osmosis membrane device, the ion exchange unit and the water quality online monitoring device 9, and furthermore, an automatic valve control unit 4 is arranged at each joint.
The wastewater treatment device adopts a PLC programming system to realize full-automatic wastewater treatment, and the display parameters of the PLC programming system comprise the water level of the original water tank 1, the service life of a membrane material, the replacement reminding of accessories, water leakage alarm and automatic cleaning setting. The PLC programming system consists of a programmable controller and a display device, and controls the operation of each module of the system by setting a program, thereby realizing full-automatic and visual operation without special personnel on duty.
The reverse osmosis membrane device is a two-stage reverse osmosis membrane component device, the two-stage reverse osmosis membrane component device is designed in the invention, the membrane adopts a low-pressure composite membrane, high-efficiency filtration of large wastewater treatment capacity can be realized, water subjected to reverse osmosis treatment can remove most of inorganic salts, organic matters, microorganisms and the like, a core effect is exerted in a wastewater treatment system, the desalination rate of the wastewater is not less than 98%, purified water subjected to reverse osmosis membrane treatment is recycled, and the purified water can be circularly supplied to laboratories, so that energy is saved, and emission is reduced.
A concentrated water tank 11 is arranged between the reverse osmosis membrane device and the ion exchange unit and is used for receiving concentrated water after raw water is treated by the reverse osmosis membrane device, and a water quality on-line monitoring device 9 is arranged between the ion exchange unit and the reverse osmosis membrane device. In the invention, the anion and the cation in the water are exchanged onto the resin by the ion exchanger, the exchange function of the resin is recovered by regeneration, the exchanged anion and cation enter the reverse osmosis membrane module again for treatment, the discharged water reaches the standard and is discharged, and the hardness of the discharged water is obviously reduced. When the resin is invalid, the acid storage tank 13 automatically adds acid to regenerate the cation exchanger 12, the alkali storage tank 15 automatically adds alkali to regenerate the anion exchanger 14, and the regeneration is automatically completed.
A water pumping device is arranged among the raw water tank 1, the pretreatment device and the reverse osmosis membrane device, a water pumping device is arranged between the concentrated water tank 11 and the ion exchange unit, and further, the water pumping device is a water pumping pump 3.
In another embodiment, the present invention provides a method of operating a wastewater treatment plant, the method comprising:
the raw water output by the raw water tank 1 is treated by a pretreatment device and a reverse osmosis membrane device, then water quality monitoring and classification are carried out, purified water is obtained and recovered, the obtained concentrated water is treated by a cation exchanger 12 and an anion exchanger 14 in sequence, and then the wastewater index is monitored by a water quality online monitoring device 9, so that the raw water can be directly discharged according to the requirement; if the water quality is not qualified, the water is circulated to the reverse osmosis membrane device for treatment again, the water is discharged after the water quality is monitored to reach the standard, the acid storage tank 13 automatically adds acid to regenerate the cation exchanger 12, and the alkali storage tank 15 automatically adds alkali to regenerate the anion exchanger 14.
Example 1
The embodiment provides a wastewater treatment device and an operation method thereof, wherein:
waste water generated in a laboratory is stored in a raw water tank 1, pumped into a quartz sand filter 5 by a water pump 3 for primary filtration, and suspended matters, organic matters, colloidal particles, microorganisms, chlorine, odor, partial heavy metal ions and the like in the water are intercepted; then the organic matters such as chlorine and byproducts of chlorine are reduced by adsorbing and decoloring the mixture by an active carbon filter 6; the quartz sand filter 5 and the activated carbon filter 6 are pretreatment devices, and pretreated water enters the reverse osmosis membrane assembly I7 and the reverse osmosis membrane assembly II 8 through pressurization of a booster pump, so that toxic and harmful organic matters, heavy metals, bacteria and viruses can be effectively intercepted, and the concentration of soluble salt compounds is reduced; the water quality index of the purified water is monitored by the water quality on-line monitoring device 9 and the purified water is recycled to the purified water recycling tank 10 for recycling. High-concentration wastewater discharged by the reverse osmosis membrane device is transferred to a concentrated water tank 11, and is pumped by a water pump 3 to remove metal ions in the wastewater through a cation exchanger 12 and an anion exchanger 14 in sequence; the wastewater index is monitored by the online water quality monitoring device 9, and the wastewater can be directly discharged according with the requirement; if not meeting the requirement, the wastewater is recycled to the reverse osmosis membrane module for treatment again. When the resin in the cation exchanger 12 and the anion exchanger 14 is failed, the acid storage tank 13 automatically throws acid to regenerate the cation exchanger 12; the alkali storage tank 15 automatically adds alkali to regenerate the anion exchanger 14, so as to ensure the treatment effect.
The results of the examination of the water quality after the treatment by the wastewater treatment apparatus in example 1 are shown in the following table 1:
TABLE 1
| Main monitoring index (mg/L) | Before treatment | After treatment |
| Arsenic (As) | 0.30 | 0.036 |
| Cadmium (Cd) | 0.03 | 0.002 |
| Hexavalent chromium | 0.15 | 0.012 |
| Mercury | 0.005 | 0.00025 |
| Lead (II) | 0.15 | 0.006 |
| Chloride compound | 8.00 | 0.56 |
| Nitrate nitrogen | 30.00 | 3.30 |
| Benzene and its derivatives | 0.05 | 0.004 |
| Toluene | 3.50 | 0.21 |
| Carbon tetrachloride | 0.078 | 0.00156 |
| Trichloromethane | 0.30 | 0.015 |
| Hardness of | 350.00 | 35.00 |
| Nitrogen sulfide | 1.00 | 0.02 |
| Phenol and its preparation | 0.01 | 0.0003 |
| Total organic carbon | 25.00 | 2.50 |
| Leguo (fruit of musical instruments) | 0.40 | 0.017 |
| Atrazine | 0.01 | 0.0014 |
| Tetracycline derivatives | 0.10 | 0.011 |
From the above table 1, it is known that the discharge index of the wastewater treated by the wastewater treatment device in the invention is far lower than that of raw water, because the two-stage reverse osmosis membrane treatment device in the whole treatment process can effectively intercept dissolved salts, colloids, microorganisms, organic matters and the like, the desalination rate reaches more than 99.8%, the effluent conductivity reaches less than 5 mus/cm, and a PLC programmable control system is adopted for full-automatic operation, so that the treatment effect is good, the occupied area is small, and the environment is protected and energy is saved.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A wastewater treatment device is characterized by comprising a raw water tank, a pretreatment device, a reverse osmosis membrane device, an ion exchange unit and an online water quality monitoring device, wherein the pretreatment device comprises a quartz sand filter and an activated carbon filter, the ion exchange unit comprises an anion exchanger connected with an alkali storage tank and a cation exchanger connected with an acid storage tank, raw water output by the raw water tank is subjected to water quality monitoring and classification after being treated by the pretreatment device and the reverse osmosis membrane device, purified water is obtained and recovered, and obtained concentrated water is subjected to treatment by the cation exchanger and the anion exchanger in sequence and then is subjected to wastewater index monitoring by the online water quality monitoring device and can be directly discharged according with requirements; if not meeting the requirement, the wastewater is recycled to the reverse osmosis membrane device for secondary treatment.
2. The wastewater treatment device according to claim 1, further comprising a pressure detection unit, wherein the pressure detection unit is respectively arranged at each connection position of the raw water tank, the pretreatment device, the reverse osmosis membrane device, the ion exchange unit and the water quality on-line monitoring device.
3. The wastewater treatment plant according to claim 2, characterized in that each of said connections is provided with an automatic valve control unit.
4. The wastewater treatment device according to any one of claims 1 to 3, wherein the wastewater treatment device adopts a PLC programming system to realize full-automatic wastewater treatment;
the PLC programming system display parameters comprise the original water tank water level, the membrane material service life, the accessory replacement reminding, the water leakage alarm and the automatic cleaning setting.
5. The wastewater treatment plant according to any one of claims 1 to 4, wherein the reverse osmosis membrane plant is a two-stage reverse osmosis membrane module plant.
6. The wastewater treatment apparatus according to any of claims 1 to 5, wherein a concentrated water tank is provided between the reverse osmosis membrane apparatus and the ion exchange unit, and is configured to receive concentrated water from raw water treated by the reverse osmosis membrane apparatus.
7. The wastewater treatment plant according to any one of claims 1 to 6, wherein a water pumping device is arranged between the raw water tank, the pretreatment device and the reverse osmosis membrane device, and a water pumping device is arranged between the concentrated water tank and the ion exchange unit;
the water pumping device is a water pump.
8. The wastewater treatment apparatus according to any one of claims 1 to 7, wherein an on-line water quality monitoring device is provided between the ion exchange unit and the reverse osmosis membrane device.
9. A method of operating a wastewater treatment plant according to any of claims 1 to 8, characterized in that the method of operation comprises:
the raw water output by the raw water tank is treated by the pretreatment device and the reverse osmosis membrane device, then water quality monitoring and classification are carried out, purified water is obtained and recovered, the obtained concentrated water is treated by the cation exchanger and the anion exchanger in sequence, and then the wastewater index is monitored by the water quality on-line monitoring device, so that the concentrated water can be directly discharged according to the requirement; if the water quality does not meet the requirement, the water is circulated to a reverse osmosis membrane device for treatment again, and then the water is discharged after the water quality is monitored and reaches the standard;
the acid storage tank automatically adds acid to regenerate the cation exchanger, and the alkali storage tank automatically adds alkali to regenerate the anion exchanger.
10. Use of a wastewater treatment plant according to any of claims 1 to 8, characterized in that the wastewater treatment plant is used in the field of laboratory integrated wastewater treatment.
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| CN114702104A (en) * | 2022-04-02 | 2022-07-05 | 倍杰特集团股份有限公司 | High-pressure reverse osmosis process method based on lithium ion concentration |
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