CN219174362U - Industrial circulation sewage zero release processing apparatus - Google Patents
Industrial circulation sewage zero release processing apparatus Download PDFInfo
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- CN219174362U CN219174362U CN202223303738.4U CN202223303738U CN219174362U CN 219174362 U CN219174362 U CN 219174362U CN 202223303738 U CN202223303738 U CN 202223303738U CN 219174362 U CN219174362 U CN 219174362U
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- 238000004064 recycling Methods 0.000 claims description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses an industrial circulating sewage zero discharge treatment device, which comprises: the device comprises a wastewater regulating tank, a first reaction tank, a second reaction tank, a concentration tank, a tubular membrane system, an intermediate water tank, a reverse osmosis device, a concentrate tank, an evaporation system and a stabilization tank; wherein: the wastewater regulating tank, the first reaction tank, the second reaction tank and the concentration tank are sequentially connected, a water inlet and a concentrated water outlet of the tubular membrane system are in circulating connection with the concentration tank, a water outlet of the tubular membrane system is connected with the middle water tank, the middle water tank is connected with the reverse osmosis device, the concentrated water outlet of the reverse osmosis device is divided into two branches, one branch is connected with the concentrated water tank, and the other branch is connected with the wastewater regulating tank; the concentrated water tank, the mother liquor discharge port of the evaporation system and the stabilizing tank are connected in sequence. The processing device has the advantages of high operation reliability, low equipment investment, low operation cost and convenient management and operation.
Description
Technical Field
The utility model relates to the field of sewage treatment equipment, in particular to an industrial circulating sewage zero-discharge treatment device.
Background
At present, the circulating cooling factory reduces the sewage discharge amount of circulating water by adding a scale inhibitor and a stabilizer into the circulating water, adding acid into the circulating water, softening by-pass water with weak acid, softening by-pass water with lime and the like, but the sewage discharge cannot be thoroughly solved, and the generated wastewater accounts for 80-90% of the total consumption and the external discharge of the factory. Although the salt content of the circulating water sewage is not high (about 1000-5000 mg/L), the scale of the circulating water sewage is relatively large, and the concentration ratio is continuously improved along with the environmental protection requirement, so that the risk of scaling of equipment such as a condenser and the like can be caused if the circulating water sewage is not treated in time. However, direct discharge of wastewater not only can lead to soil hardening and salinization, but also can generate a certain inhibition effect on crops and microorganisms so as to destroy ecological balance, thus realizing 'zero discharge' of industrial wastewater is a problem to be solved urgently. In view of the characteristics of large discharge amount and stable salt content of the total circulating sewage, the method for improving the concentration ratio of the circulating cooling water and recycling the circulating water sewage is a main way for saving water and reducing pollution discharge at present.
The existing circulating water sewage treatment process mainly comprises pretreatment, an ion exchange method, pretreatment and multistage reverse osmosis. The obtained produced water is recycled, and the concentrated water is used for other purposes, such as wet desulfurization in the coal and electricity industry, coking quenching or cooling of waste steel slag in steel enterprises, and further evaporation and crystallization treatment is needed if no digestion way exists. The ion exchange method reduces hardness in a transfer mode, so that a large amount of high-hardness regenerated acid-base waste liquid is generated, and water saving of the system is not facilitated. The multistage reverse osmosis process has higher production cost, and the existence of hardness ions can cause the fouling and blocking of the membrane, reduce the membrane flux, increase the cleaning frequency and reduce the recovery rate of water. Therefore, the zero discharge technology of the circulating water sewage has become a research hot spot, but is limited to the treatment effect and the water quantity scale, and the early investment of the desalting of the circulating water sewage is large, the water production cost is high, the system is complex, and the market demand is difficult to meet.
Disclosure of Invention
The utility model provides an industrial circulating sewage zero-emission treatment device, which comprises: the device comprises a wastewater regulating tank, a first reaction tank, a second reaction tank, a concentration tank, a tubular membrane system, an intermediate water tank, a reverse osmosis device, a concentrate tank, an evaporation system and a stabilization tank. Wherein: the wastewater treatment device comprises a wastewater regulating tank, a first reaction tank, a second reaction tank and a concentration tank, wherein the wastewater regulating tank, the first reaction tank, the second reaction tank and the concentration tank are sequentially connected, a water inlet, a concentrated water outlet and the concentration tank of a tubular membrane system are in circulating connection, a water outlet of the tubular membrane system is connected with an intermediate water tank, and the intermediate water tank is connected with a reverse osmosis device. The concentrated water discharge port of the reverse osmosis device is divided into two branches, one branch is connected with the concentrated water tank, and the other branch is connected with the wastewater regulating tank. The concentrated water tank, the mother liquor discharge port of the evaporation system and the stabilizing tank are connected in sequence.
Further, the device also comprises a sludge tank, and sludge discharge openings of the first reaction tank, the second reaction tank and the concentration tank are connected with the sludge tank, so that the sludge produced by the devices is collected and treated uniformly.
Further, the sludge dewatering device further comprises a sludge dewatering machine, the sludge tank is connected with the sludge dewatering machine, and a filtrate port of the sludge dewatering machine is connected with the wastewater regulating tank, so that the filtrate obtained by sludge dewatering is subjected to reflux circulation treatment.
Further, the middle water tank is connected with the reverse osmosis device through a booster pump, a cartridge filter and a high-pressure pump in sequence, so that pretreated water in the middle water tank is sent to the reverse osmosis device for treatment. Preferably, the reverse osmosis membrane in the reverse osmosis device is a sea water desalination membrane or a high-pressure reverse osmosis membrane.
Further, the evaporation system comprises an MVR or TVR evaporation system.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the treatment device disclosed by the utility model, caustic soda and magnesium chloride can be added into the wastewater through the first reaction tank and the second reaction tank, and then sodium carbonate is added, so that the wastewater is subjected to double-alkali process treatment, the silicon, the hardness, the heavy metals and the organic matters are converted into colloidal sludge to be removed, and the process feasibility of high-rate concentration but no scaling of a subsequent tubular membrane system is ensured. Because the silica scale is not only the scale control factor of membrane concentration, but also the scale blocking factor of the evaporation crystallizer, the utility model realizes the removal in the pretreatment stage, and effectively reduces the burden of a tubular membrane system and an evaporation system.
2. The treatment device divides the concentrated water discharge port of the reverse osmosis device into two branches, wherein one branch is connected with the concentrated water tank, and the other branch is connected with the wastewater regulating tank. And thus, the concentrated water generated by the reverse osmosis device can be completely returned to the wastewater to be regulated for circulating concentration in the system starting stage, and the concentrated water is partially returned until the system operation is stable to a certain degree (such as the salt content of 50000-150000 mg/L), and the residual concentrated water is quantitatively discharged into the concentrated water tank and enters the subsequent evaporation system for evaporation crystallization treatment. Therefore, after the hardness index is concentrated and raised by reverse osmosis, part of concentrated water flows back to the wastewater regulating tank, not only is the concentration of the system water inlet improved, but also the hardness which cannot be removed originally can be removed again through the pretreatment of the first reaction tank and the second reaction tank, so that the process flow is shortened, the sewage recovery rate is improved, and the running stability of the system is enhanced. Compared with traditional multistage reverse osmosis process equipment and the like, the industrial circulating sewage zero-discharge treatment device has the advantages of low equipment investment, low running cost and convenient management and operation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
Fig. 1 is a schematic diagram of the construction of an industrial circulation sewage zero-discharge treatment apparatus in the following embodiments.
The labels in the figures represent: 1-wastewater regulating tank, 2-first reaction tank, 3-second reaction tank, 4-concentration tank, 5-tubular membrane system, 6-intermediate water tank, 7-reverse osmosis device, 8-concentrated water tank, 9-evaporation system, 10-stabilization tank, 11-sludge tank and 12-sludge dewatering machine.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
In the description of the present utility model, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and do not limit the structure, but merely facilitate description of the present utility model, rather do not indicate or imply that the device or element being referred to needs to have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. The technical scheme of the utility model is further described with reference to the attached drawings and the embodiments.
Referring to fig. 1, an example of an industrial circulation sewage zero discharge treatment apparatus includes: the device comprises a wastewater regulating tank 1, a first reaction tank 2, a second reaction tank 3, a concentration tank 4, a tubular membrane system 5, an intermediate water tank 6, a reverse osmosis device 7, a concentrate tank 8, an evaporation system 9 and a stabilizing tank 10. Wherein:
the wastewater regulating tank 1, the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 are sequentially connected. The wastewater regulating tank 1 is mainly used for temporarily storing circulating water to be treated and discharging sewage, and the subsequent concentrated water discharged by the reverse osmosis device 7 in an initial operation stage. The first reaction tank 2 is used for carrying out a first step of pretreatment on the sewage from the sewage regulating tank 1 so as to remove silicon ions in the sewage. The second reaction tank 3 is used for carrying out a second step of pretreatment on the sewage from the first reaction tank 2 so as to remove hardness ions and scaling substances in the water. The concentration tank 4 is used for receiving the sewage treated by the second reaction tank 3, and carrying out circulating concentration treatment on the sewage in the concentration tank 4 through the tubular membrane system 5, the produced concentrated water enters the concentration tank 4, and the produced water enters the middle water tank 6. Therefore, the water inlet and the concentrated water outlet of the tubular membrane system 5 are in circulating connection with the concentration tank 4, and the water outlet of the tubular membrane system 5 is connected with the middle water tank 6. The sewage in the concentration tank 4 enters an internal circulation type DF tubular membrane system 5 for concentration treatment after being pressurized by a circulating pump, the concentrated water continuously flows back to the concentration tank 4 to be mixed with the inlet water from the second reaction tank 3, the sludge generated in the concentration tank 4 can be periodically discharged, and the produced water enters the intermediate water tank 6 for further treatment.
The middle water tank 6 and the reverse osmosis device 7 are connected through a booster pump, a cartridge filter and a high-pressure pump in sequence. The sewage in the middle water tank 6 is boosted by the booster pump, enters the security filter for filtration, is pressurized again by the high-pressure pump and enters the reverse osmosis device 7 for reverse osmosis treatment, and can be treated by a seawater desalination membrane or a high-pressure reverse osmosis membrane element. The concentrated water discharge port of the reverse osmosis device 7 is divided into two branches, one branch is connected with the concentrated water tank 8, the other branch is connected with the wastewater regulating tank 1, concentrated water generated by the reverse osmosis device 7 is completely returned to the wastewater regulating tank 1 at the initial stage of system operation, not only is the concentration of water entering the system improved, but also the hardness which cannot be removed originally can be removed again through the pretreatment of the first reaction tank 2 and the second reaction tank 3, the process flow is shortened, the wastewater recovery rate is improved, and the system operation stability is enhanced.
The concentrated water tank 8, the mother liquor discharge port of the evaporation system 9 and the stabilizing tank 10 are connected in sequence. Wherein: the concentrate tank 8 is used for receiving concentrate from the reverse osmosis device 7, and evaporating and crystallizing the concentrate after the concentrate enters the evaporation system 9 to reduce sewage. The concentrated water adopts a forced circulation operation mode in the evaporation system 9, and the process can select MVR technology or TV technology, and forced circulation is selected to improve the evaporation water quantity, reduce scaling and prolong the cleaning period, thereby reducing the process sections of equipment, ensuring the economy, reducing the quantity of the equipment and improving the simplicity of system operation. For example, if MVR technology is selected, a three-way centrifugal compressor or a Roots-type vapor compressor is selected, and the vapor temperature rise is up to 15 ℃. If TVR technology is selected, the temperature of the steam at the outlet of the steam ejector is required to reach more than 120 ℃. The stabilizing tank 10 is mainly used for further processing mother liquor from the evaporating system 9, the mother liquor still contains some fluoride ions, heavy metal ions and the like, quicklime is added into the stabilizing tank 10 and reacts with the mother liquor to generate slaked lime combined water, and the moisture in the heat evaporating mother liquor is released to form wet solids, and the wet solids carry calcium fluoride formed by utilizing calcium ion reaction and precipitate formed by utilizing hydroxide and heavy metal ions, so that a subsequent drying process is not needed, the crystallization salt does not need to be dehydrated, and the process flow is further shortened compared with the traditional processing method, so that the stability of the fluoride ions and the heavy metal ions is realized, the running reliability is high, the equipment investment is low, the running cost is low, and the management operation is convenient.
Referring to fig. 1, in another embodiment, the industrial circulation sewage zero-discharge treatment apparatus exemplified by the above embodiment further includes a sludge tank 11 and a sludge dehydrator 12. Wherein: the sludge discharge ports of the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 are connected with the sludge tank 11, so that the sludge generated in the devices is collected and treated uniformly. The sludge tank 11 is connected with the sludge dewatering machine 12, and a water outlet of the sludge dewatering machine 12 is connected with the wastewater regulating tank 1, so that a filtrate obtained by dewatering sludge is subjected to reflux circulation treatment.
Taking a pilot-scale test of treatment of circulating water of a certain power plant as an example, the treatment device for zero discharge of industrial circulating sewage shown in fig. 1 is adopted to treat the sewage, and specifically comprises the following steps:
(1) The circulating water drains sewage (water volume 3m 3 And/h, the salt content TDS is 2000 mg/L) enters a wastewater regulating tank 1 for temporary storage, caustic soda is added to regulate the pH value to 11 after the circulating water sewage is conveyed into a first reaction tank 2, and magnesium chloride is continuously added under alkaline conditions for mixed reaction for 1h, so that silicon elements in the circulating water sewage are removed, and the influence of difficult-to-clean silicon scale on the subsequent treatment effect is prevented. After completion the supernatant in the first reaction tank 2 is fed into said second reaction tank 3.
(2) Adding 270mg/L sodium carbonate into the second reaction tank 3 to remove hardness ions and scaling substances in water, improving the safety of RO membrane concentration, and after the concentration, feeding the supernatant into the concentration tank 4, lifting the supernatant into a tubular membrane system 5 by a circulating pump to carry out cross-flow filtration, wherein the aperture of an ultrafiltration membrane of the tubular membrane system 5 is 0.05 mu m, and the Suspended Solids (SS) and suspended particles and other pollutants are 100 percent trapped. The tubular membrane system 5 adopts a tubular ultrafiltration membrane process, the SDI value of effluent treated by the tubular membrane system 5 is smaller than 2, and the effluent accords with the condition of entering the reverse osmosis device 7. The concentrated water produced by the tubular membrane system 5 enters the concentration tank 4, and the produced water enters the intermediate water tank 6.
(3) Hydrochloric acid is added into the middle water tank 6 to adjust the pH value of water to 6.5, and acid is added after the tubular membrane system 5 to adjust the pH value, so that the ultrafiltration membrane can intercept almost all reaction precipitates without the problem of dissolution, the hardness of the effluent is greatly reduced, and reverse osmosis treatment is facilitated. And (3) pumping water in the middle water tank 6 into a reverse osmosis device 7 for reverse osmosis treatment, wherein reverse osmosis concentrated water generated by the reverse osmosis device is completely refluxed at the early stage of system start-up by 0.72t/h, after the salt content accumulation of the concentrated water is stabilized to 50000mg/L through continuous cyclic concentration, the reflux quantity of the concentrated water is controlled to be 0.6t/h, and the concentrated water enters the wastewater regulating tank 1 to be mixed with the circulating water sewage of 2000mg/LTDS, so that the comprehensive salt content of the system water is ensured to be kept at about 10000mg/L in the stable operation process. The internal reflux concentration of the system is utilized to simplify a process chain, so that the recovery rate is improved, the subsequent evaporation and crystallization scale is reduced, 5% of equipment and production resources are saved, and the production investment and the running cost are effectively controlled. And the rest concentrated water generated by the reverse osmosis device 7 is discharged into a concentrated water tank 8 for temporary storage, and the reverse osmosis produced water generated by the reverse osmosis device 7 is stored and recycled.
(4) The concentrated water in the concentrated water tank 8 is desalted by adopting TVR technology through the evaporation system 9: the feeding scale is 0.12t/h, the salt content is 50300mg/L, the steam temperature at the outlet of the steam ejector is 130 ℃, the generated mother liquor (about 24L/h, the salt content is 251000 mg/L) enters the stabilizing tank 10, quicklime and the mother liquor are added to generate slaked lime combined water, the heat is released to evaporate the water in the mother liquor to form wet solids, and the wet solids carry calcium fluoride formed by the reaction of calcium ions and precipitate formed by hydroxyl and heavy metal ions, so that the stability of fluoride ions and heavy metal ions is realized.
The sludge generated in the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 is inorganic sludge, and enters the sludge tank 11, and then enters the sludge dehydrator 12 for treatment by a plate-and-frame filter press to produce sludge cakes for outward transportation.
Finally, it should be noted that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model. While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (6)
1. An industrial recycling sewage zero release processing apparatus, characterized by comprising: the device comprises a wastewater regulating tank, a first reaction tank, a second reaction tank, a concentration tank, a tubular membrane system, an intermediate water tank, a reverse osmosis device, a concentrate tank, an evaporation system and a stabilization tank; wherein: the wastewater regulating tank, the first reaction tank, the second reaction tank and the concentration tank are sequentially connected, a water inlet and a concentrated water outlet of the tubular membrane system are in circulating connection with the concentration tank, a water outlet of the tubular membrane system is connected with the middle water tank, the middle water tank is connected with the reverse osmosis device, the concentrated water outlet of the reverse osmosis device is divided into two branches, one branch is connected with the concentrated water tank, and the other branch is connected with the wastewater regulating tank; the concentrated water tank, the mother liquor discharge port of the evaporation system and the stabilizing tank are connected in sequence.
2. The apparatus according to claim 1, further comprising a sludge tank, wherein sludge outlets of the first reaction tank, the second reaction tank, and the concentration tank are connected to the sludge tank.
3. The apparatus according to claim 2, further comprising a sludge dewatering machine, wherein the sludge dewatering machine is connected to the sludge dewatering machine, and wherein a water outlet of the sludge dewatering machine is connected to the wastewater regulating tank.
4. The zero-emission treatment device for industrial circulating sewage according to claim 3, wherein the intermediate water tank and the reverse osmosis device are connected through a booster pump, a cartridge filter and a high-pressure pump in sequence.
5. The apparatus according to claim 4, wherein the reverse osmosis membrane in the reverse osmosis apparatus is a seawater desalination membrane or a high-pressure reverse osmosis membrane.
6. The industrial circulating sewage zero release treatment apparatus of any one of claims 1-5, wherein the evaporation system comprises a MVR or TVR evaporation system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223303738.4U CN219174362U (en) | 2022-12-07 | 2022-12-07 | Industrial circulation sewage zero release processing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223303738.4U CN219174362U (en) | 2022-12-07 | 2022-12-07 | Industrial circulation sewage zero release processing apparatus |
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| CN219174362U true CN219174362U (en) | 2023-06-13 |
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| CN202223303738.4U Active CN219174362U (en) | 2022-12-07 | 2022-12-07 | Industrial circulation sewage zero release processing apparatus |
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