CN218146136U - System for treating and recycling circulating wastewater of iron and steel plant - Google Patents
System for treating and recycling circulating wastewater of iron and steel plant Download PDFInfo
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- CN218146136U CN218146136U CN202221623733.7U CN202221623733U CN218146136U CN 218146136 U CN218146136 U CN 218146136U CN 202221623733 U CN202221623733 U CN 202221623733U CN 218146136 U CN218146136 U CN 218146136U
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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
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The utility model discloses a system for treating and recycling circulating wastewater of a steel plant, which comprises a wastewater treatment system and a water replenishing pool communicated with the wastewater treatment system; the wastewater treatment system comprises a raw water tank, a multi-media filter, a soft water system and a reverse osmosis system which are sequentially arranged, wherein the soft water system comprises a water softener, a bag filter and a soft water tank which are sequentially arranged, and the reverse osmosis system comprises a security filter, a reverse osmosis device and a reverse osmosis water production tank which are sequentially arranged; the outlet of the reverse osmosis water production tank is communicated with the inlet of the water supplementing tank, and the water supplementing tank is used for supplementing water to the cooling tower, chilled water and an air conditioner. The utility model discloses based on the quality of water characteristic of circulation waste water, get rid of solid particle and metal ion in the waste water through multi-media filter equipment, softening system and reverse osmosis system, make the play water reach corresponding circulation quality of water requirement, realized low cost, efficient waste water regeneration mode.
Description
Technical Field
The utility model relates to a sewage treatment and retrieval and utilization equipment field, concretely relates to handle and retrieval and utilization steel plant circulating wastewater system.
Background
A large amount of sewage is discharged in the production process in a steel mill, wherein the sewage mainly comes from circulating water pollution discharge, water discharge of a refrigerating machine room and partial well water, the organic pollutant content of the waste water is low, the chemical oxygen demand after mixing is 3-30mg/L, and the electric conductivity is 700-1200 mu s/cm. In order to reduce the wastewater discharge and improve the resource utilization of the wastewater, the mixed wastewater is usually treated by a physical and chemical treatment method at present, for example, a method of adding chemicals to precipitate and then filtering is adopted, but the method cannot reduce the salt content in the wastewater, so that the treated wastewater cannot meet the requirement of recycling the circulating water quality.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve above-mentioned problem, provide a handle and retrieval and utilization steel plant circulation waste water system, to the water quality characteristics of circulation waste water and the application demand of corresponding circulation quality of water, through getting rid of impurity, softening desalination to circulation waste water and handling, make its demand that satisfies corresponding circulation quality of water.
The utility model discloses contain following technical scheme:
the utility model provides a system for treating and recycling the circulating wastewater of a steel plant, which comprises a wastewater treatment system and a water replenishing pool communicated with the wastewater treatment system;
the wastewater treatment system comprises a raw water tank, a multi-media filter, a soft water system and a reverse osmosis system which are sequentially arranged;
the water outlet of the raw water tank is communicated with the water inlet of the multi-media filter;
the soft water system includes:
the water softener is communicated with the water outlet of the multi-medium filter at the water inlet;
the water inlet of the bag filter is communicated with the water outlet of the water softener;
the water inlet of the soft water tank is communicated with the first water outlet of the bag filter;
the reverse osmosis system comprises:
the water inlet of the cartridge filter is communicated with the first water outlet of the soft water tank;
the water inlet of the reverse osmosis device is communicated with the water outlet of the cartridge filter;
the water inlet of the reverse osmosis water production tank is communicated with the water outlet of the reverse osmosis device;
the delivery port of reverse osmosis water production tank with the first water inlet in moisturizing pond is linked together, the second delivery port of softened water tank with the second water inlet in moisturizing pond is linked together.
The setting of former water tank in the system can carry out the equal volume of homogeneity to different waste waters and handle, reduces sewage and to the impact of follow-up treatment facility, guarantees the normal operating of follow-up treatment structures or equipment.
Furthermore, the raw water tank is used for collecting well water, circulating water system pollution discharge and indirect evaporation cooling machine room drainage; the outlet water of the raw water tank is delivered to the multi-medium filter by a delivery pump.
Furthermore, the filter material in the multi-media filter comprises quartz sand and anthracite, and is used for removing particulate matters with the particle size of more than 20 microns in the wastewater. Avoid materials such as large granule silt, iron rust, colloidal substance, suspended solid to cause the damage to subsequent reverse osmosis membrane.
Furthermore, a backwashing water pump is contained in the multi-media filter and used for providing reverse water flow to backwash the filter material
The multi-medium filter utilizes two kinds of filter materials of quartz sand and anthracite to remove suspended matters in the raw water tank effluent, and belongs to common quick filter equipment. The method specifically comprises the following steps: when the water containing suspended particles is fully mixed with the flocculating agent, the double electric layers forming colloidal particles in the water are compressed. When the colloid particles flow through the filter material layer of the medium filter, the gaps of the filter material play a role in screening the suspended matters, so that the suspended matters are easily adsorbed on the surface of the filter material. When a certain amount of dirt is trapped on the surface layer of the filter material to form the filter membrane, the pressure difference between the front and the rear of the filter will rise rapidly along with the time until the filter membrane fails. At the moment, the filter material needs to be backwashed by reverse water flow, so that the quartz sand and the smokeless coal layer in the filter are suspended and loosened, trapped substances adhered to the surfaces of the quartz sand and the anthracite are peeled off and taken away by the water flow, and the filtering function is recovered.
The softener carries out ion displacement on the effluent of the multi-media filter, and calcium ions and magnesium ions in the wastewater are displaced through sodium ions so as to reduce the hardness of the wastewater.
Further, handle and retrieval and utilization steel plant circulation wastewater system still contains the emergent pond that is linked together with wastewater treatment system, the import in emergent pond with bag filter's second delivery port is linked together, the play water in emergent pond is used for emergent moisturizing through a delivery pump transport to the cooling tower in.
Furthermore, the bag filter is a pressure type filter device, which mainly comprises a filter cylinder body, a filter cylinder cover, a quick opening mechanism, a stainless steel filter bag reinforcing net and other main components, wherein the filter liquor flows into the filter bag through a side inlet pipe of the filter shell, the filter bag is arranged in a reinforcing net basket, the qualified filter liquor can be obtained after the liquid penetrates through the filter bag with the required fineness grade, and the impurity particles are intercepted by the filter bag. The bag filter is used for removing substances with the particle size of more than 5 mu m in the wastewater.
Further, the Reverse Osmosis (RO) system further comprises a high pressure pump, and the cartridge filter outlet water enters and passes through the RO unit by pressure provided by the high pressure pump.
From the standpoint of the operation and operation safety of the RO system, the security filter, the high-pressure pump and the RO device are all arranged in series one to one, i.e. one set of RO is provided with one security filter and one high-pressure pump. A safety filter is arranged in the reverse osmosis system and is used for preventing the reverse osmosis membrane and the high-pressure pump from being damaged by mechanical impurities possibly existing in a pipeline of equipment and secondary pollution possibly generated by the system.
Furthermore, the aperture of a reverse osmosis membrane in the reverse osmosis device is less than 0.1 nm-0.7 nm, the reverse osmosis device also comprises a concentrated water output end, and the concentrated water output end is communicated with a concentrated water storage device.
The reverse osmosis device is a device which uses a certain pressure to separate a solvent in a solution through a reverse osmosis membrane (or called a semipermeable membrane) and is used as a main desalting device in the wastewater treatment system, and most of soluble salt, organic matters, microorganisms and the like in water are removed by utilizing the selective permeability of the reverse osmosis membrane so as to ensure the requirement of the effluent quality. In order to effectively separate water molecules and other impurities such as inorganic salt, heavy metal ions, organic matters, colloid, bacteria, viruses and the like in the wastewater, a reverse osmosis membrane with a proper pore diameter is required to be selected, and the impermeable concentrated water is conveyed to a concentrated water storage device through a concentrated water output end.
Furthermore, the desalination rate of the reverse osmosis membrane reaches more than 99%, and the operational desalination rate within 5 years reaches more than 97%.
Furthermore, the outlet water of the reverse osmosis water production tank is conveyed to a water supplementing tank through a conveying pump.
Furthermore, the second delivery port of softened water tank with the second water inlet in moisturizing pond is linked together, the play water of softened water tank second delivery port is carried to in the moisturizing pond through a delivery pump.
And mixing the water outlet of the second water outlet of the soft water tank and the water outlet of the reverse osmosis water production tank in the water supplementing tank to adjust the water quality of the water supplementing tank.
Furthermore, the water supplementing pool is communicated with a cooling tower water supplementing device, a chilled water supplementing device and an air conditioner water supplementing device; and the outlet water of the water supplementing pool is respectively conveyed into the cooling tower water supplementing device, the chilled water supplementing device and the air conditioner water supplementing device through a conveying pump.
Compared with the prior art, the beneficial effects of the utility model reside in that:
according to the water quality condition of specific circulating wastewater in a steel plant, the utility model provides a wastewater treatment and recovery system, which efficiently removes impurities and salt in wastewater through multi-media filter, softening and reverse osmosis treatment of wastewater, so that the treated wastewater meets the water quality standard of make-up water of a circulating cooling system and can be recycled; the system is simple and efficient, has low treatment cost, and effectively solves the problem of recycling of internal circulating wastewater and cooling wastewater of a steel mill.
Drawings
FIG. 1 is a flow diagram for treating and recycling recycled wastewater of a steel plant.
Detailed Description
The present invention is further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment discloses a system for treating and recycling circulating wastewater of an iron and steel plant, which has a flow chart shown in figure 1, and comprises a raw water tank for collecting well water, discharging sewage of a circulating water system and discharging water of an indirect evaporation cooling machine room, wherein different wastewater can be homogenized and uniformly distributed in the raw water tank; the multi-media filter is communicated with the outlet of the raw water tank at the inlet and is used for removing particles such as silt, rust, colloidal substances, suspended matters and the like in the outlet water of the raw water tank; the water softener is communicated with the outlet of the multi-medium filter at the water inlet and is used for replacing calcium and magnesium ions in the water outlet of the multi-medium filter; the bag filter is communicated with the water softener outlet at the inlet and is used for removing substances with the particle size of more than 5 mu m remained in the outlet water of the water softener, and the bag filter comprises a first outlet and a second outlet; the inlet of the soft water tank is communicated with the first outlet of the bag filter, the inlet of the emergency water tank is communicated with the second outlet of the bag filter, the soft water tank comprises a first outlet and a second outlet, and the outlet water of the emergency water tank is conveyed into the cooling tower through a conveying pump for emergency water supplement; the security filter is communicated with the first outlet of the soft water tank at the inlet and is used for removing mechanical impurities or pollutants; the high-pressure pump and the reverse osmosis device are connected with the cartridge filter in series, the reverse osmosis device is used for removing most of soluble salt, organic matters and microorganisms in the wastewater, the separated concentrated water is discharged through a concentrated water output end, and the water treated by the reverse osmosis device is conveyed to a reverse osmosis water production tank; the water replenishing pool comprises a first water inlet and a second water inlet, the water outlet of the reverse osmosis water production tank is communicated with the first water inlet of the water replenishing pool, the second water outlet of the soft water tank is communicated with the second water inlet of the water replenishing pool, and the treated water is mixed and prepared in the water replenishing pool; the water supplementing tank is communicated with the cooling tower water supplementing device, the chilled water supplementing device and the air conditioner water supplementing device, and water in the water supplementing tank is conveyed to each water supplementing device through the conveying pump.
The main corollary equipment of each device in the system and the setting of relevant parameters thereof are as follows:
(1) Former water tank corollary equipment:
a vertical stirrer: 2 double-layer paddles, wherein N =5.5kw, and the shafts and the paddles are made of SUS 304;
a lift pump: q =100m 3 H, H =30m, n =15kw, cast iron material, 2 in number (1 for 1);
an ultrasonic liquid level meter: 0-4m,4-20mA, and 1 table in number;
an electromagnetic flow meter: DN150,4-20mA, flange type, tetrafluoro lining and 1 in number.
(2) The multi-medium filter corollary equipment:
backwashing a water pump: q =280m 3 H, H =22m, n =30kw, cast iron material, 2 in number (1 for 1);
the number of devices: 3 (2 is prepared by 1);
normal flow rate: 50m 3 H/table;
the running flow rate: 9.4m/h;
water backwashing strength: 14.7L/m 2 .s。
(3) The softener corollary equipment:
a regeneration water pump: q =20m 3 H =35m, n =4.0kw, 2 steel-lined plastic material in number (1 for 1);
saline tank, effective volume 8m 3 PE material;
the diameter of a blade of the stirrer is 500mm, the axial length is 2500mm, the power is 2.2kW, and a shaft and an impeller are made of plastic-lined steel materials;
an ultrasonic liquid level meter: 0-4m,4-20mA, and 1 table in number.
(4) Bag filter corollary equipment:
the number of devices: 1, carrying out;
diameter of the equipment: phi 650mm;
total height: SH1500 mm;
normal flow rate: 100m 3 H/table;
and (3) filtering precision: 5 μm.
(5) Softening water tank corollary equipment:
a lift pump: q =60m 3 H =21m, n =5.5kw, sus304 material, 2 in number (1 for 1);
and (3) RO booster pump: q =40m 3 H, H =31m, n =5.5kw, sus304 material, number 2 (1 for 1);
an ultrasonic liquid level meter: 0-4m,4-20mA, and 1 table in number;
an electromagnetic flow meter: DN100,4-20mA, flange type, tetrafluoro lining and 2 in number.
(6) Cartridge filter corollary equipment:
the type: a vertical cylinder;
the type: the diameter is 400mm;
force is exerted: 0m 3 /h；
A housing: an SS304;
the number of filter elements: 20 pieces/table;
length of the filter element: 40';
precision of the filter element: 5 mu m;
quantity: and 2, carrying out the following steps.
(7) The reverse osmosis device is matched with equipment:
reverse osmosis high pressure pump, Q =40m 3 H, head =1.25MPa, single-stage end-suction centrifugal pump, number: 2, performing stand-by;
a reverse osmosis device: 1 set, output: 30m 3 H/jacket, composite membranes.
(8) The reverse osmosis produces water tank corollary equipment:
a lift pump: q =60m 3 H =21m, n =5.5kw, sus304 material, 2 in number (1 for 1);
an ultrasonic liquid level meter: 0-4m,4-20mA, and 1 table in number;
an electromagnetic flow meter: DN100,4-20mA, flange type, tetrafluoro lining and 1 table.
The raw water in table 1 was treated by the above system, and the indexes after treatment are shown in table 2.
TABLE 1 Water quality index in raw water tank
| Item | Unit | Quality of circulating water blowdown | Quality of well water | Remarks for note |
| Amount of water | m 3 /h | 13 | 81 | 94 |
| Temperature of | ℃ | 25-35 | 15-25 | 20-25 |
| pH | - | 7-9 | 7-8 | 7-8.5 |
| Suspended matter | mg/L | 28 | 8 | 10.9 |
| Turbidity of water | NTU | 20 | 5 | 7.1 |
| Total hardness (as CaCO) 3 Meter) | mg/L | 450 | 400 | 407.1 |
| Calcium hardness (as CaCO) 3 Meter) | mg/L | 240 | 200 | 205.7 |
| Total alkalinity (as CaCO) 3 Meter) | mg/L | 324 | 250 | 260.6 |
| Cl - | mg/L | 120 | 100 | 102.9 |
| Electrical conductivity of | μs/cm | 1200 | 700 | 771.4 |
| COD Cr | mg/L | 30 | 3 | 6.9 |
TABLE 2 Water quality in the post-treatment makeup tank
| Item | Unit of | Numerical value |
| pH(25℃) | -- | 7.5-9.5 |
| Turbidity of water | NTU | ≤5 |
| Conductivity (25 ℃ C.) | μs/cm | ≤600 |
| Cl - | mg/L | ≤250 |
| Total iron | mg/L | ≤0.3 |
| Calcium hardness (as CaCO) 3 Meter) | mg/L | ≤300 |
| Total alkalinity (as CaCO) 3 Meter) | mg/L | ≤200 |
| Dissolved oxygen | mg/L | -- |
| Organic phosphorus (in terms of P) | mg/L | -- |
The water quality standard (GB/T29044-2012) of make-up water required by the water quality of a central air-conditioning circulating cold water system, the water quality standard (GB/T29044-2012) of make-up water required by the water quality of central heating adopting a fan coil and the water quality standard (GB/T50050-2017) of make-up water of an indirect cooling open type circulating cooling water system are respectively shown in the following tables 3-5, and the water quality in a make-up water tank treated by the system meets the different make-up water quality requirements.
TABLE 3 Water quality requirement of central air-conditioning circulating cooling water system for supplementing water (chilled water supplementing)
| Item | Unit of | Numerical value |
| pH(25℃) | -- | 7.5-9.5 |
| Turbidity of water | NTU | ≤5 |
| Conductivity (25 ℃ C.) | μs/cm | ≤600 |
| Cl - | mg/L | ≤250 |
| Total iron | mg/L | ≤0.3 |
| Calcium hardness (as CaCO) 3 Meter) | mg/L | ≤300 |
| Total alkalinity (as CaCO) 3 Meter) | mg/L | ≤200 |
| Dissolved oxygen | mg/L | -- |
| Organic phosphorus (in terms of P) | mg/L | -- |
TABLE 4 Central heating Water requirement make-up Water requirement (air conditioner make-up Water) with Fan coil
| Item | Unit | Numerical value |
| pH(25℃) | -- | 7.5-9.5 |
| Conductivity (25 ℃ C.) | μs/cm | ≤600 |
| Turbidity of water | NTU | ≤10 |
| Cl - | mg/L | ≤250 |
| Total iron | mg/L | ≤0.3 |
| Calcium hardness (as CaCO) 3 Meter) | mg/L | ≤80 |
| Total hardness (as CaCO) 3 Meter) | mg/L | ≤300 |
| Total alkalinity (as CaCO) 3 Meter) | mg/L | ≤200 |
| Dissolved oxygen | mg/L | -- |
| Organic phosphorus (in terms of P) | mg/L | -- |
TABLE 5 Water quality Standard of reclaimed water for make-up water of intercooling open-type circulating cooling water system (Water supplement to cooling tower)
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (8)
1. A system for treating and recycling circulating wastewater of an iron and steel plant is characterized by comprising a wastewater treatment system and a water replenishing tank communicated with the wastewater treatment system;
the wastewater treatment system comprises a raw water tank, a multi-media filter, a soft water system and a reverse osmosis system which are arranged in sequence;
the water outlet of the raw water tank is communicated with the water inlet of the multi-media filter;
the soft water system includes:
the water softener is communicated with the water outlet of the multi-medium filter at the water inlet;
the water inlet of the bag filter is communicated with the water outlet of the water softener;
the soft water tank is communicated with the first water outlet of the bag filter at the water inlet;
the reverse osmosis system comprises:
the water inlet of the cartridge filter is communicated with the first water outlet of the soft water tank;
the water inlet of the reverse osmosis device is communicated with the water outlet of the cartridge filter;
the water inlet of the reverse osmosis water generating tank is communicated with the water outlet of the reverse osmosis device;
the delivery port of reverse osmosis water production tank with the first water inlet in moisturizing pond is linked together, the second delivery port of softened water tank with the second water inlet in moisturizing pond is linked together.
2. The system for treating and recycling steel plant circulating wastewater according to claim 1, wherein the raw water tank is used for collecting well water, circulating water system blowdown and indirect evaporation cooling machine room drainage; and the outlet water of the raw water tank is conveyed into the multi-media filter through a conveying pump.
3. The system of claim 1, further comprising an emergency water tank in communication with the wastewater treatment system, wherein an inlet of the emergency water tank is in communication with the second outlet of the bag filter, and wherein an outlet of the emergency water tank is delivered to the cooling tower via a delivery pump for emergency water replenishment.
4. The system for treating and recycling steel plant circulating wastewater according to claim 1, wherein said reverse osmosis system further comprises a high pressure pump, and said cartridge filter effluent enters and passes through said reverse osmosis unit by pressure provided by said high pressure pump.
5. The system for treating and recycling steel plant circulating wastewater according to claim 1, wherein the aperture of a reverse osmosis membrane in the reverse osmosis device is 0.1nm to 0.7 nm; the reverse osmosis device also comprises a concentrated water output end which is used for discharging the separated concentrated water.
6. The system for treating and recycling steel plant circulating wastewater according to claim 1, wherein the outlet water of the reverse osmosis water production tank and the outlet water of the second outlet of the soft water tank are respectively delivered to a water replenishing tank through a delivery pump.
7. The system for treating and recycling steel plant circulating wastewater according to claim 1, wherein the water from the reverse osmosis water production tank and the water from the second water outlet of the soft water tank are mixed in the water replenishing tank to adjust the water quality.
8. The system for treating and recycling steel plant circulating wastewater according to claim 1, wherein the water replenishing tank is communicated with a cooling tower water replenishing device, a chilled water replenishing device and an air conditioner water replenishing device.
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| CN202221623733.7U CN218146136U (en) | 2022-06-24 | 2022-06-24 | System for treating and recycling circulating wastewater of iron and steel plant |
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