CN112939368A - Circulating water sewage treatment and recycling method with high desalting rate - Google Patents
Circulating water sewage treatment and recycling method with high desalting rate Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 239000010865 sewage Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000011033 desalting Methods 0.000 title claims abstract description 15
- 238000004064 recycling Methods 0.000 title claims abstract description 13
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 53
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 46
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 238000010612 desalination reaction Methods 0.000 claims description 9
- 239000000701 coagulant Substances 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 4
- 150000001450 anions Chemical class 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 2
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- 230000008859 change Effects 0.000 abstract description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a method for treating and recycling circulating sewage with high desalting rate, which mainly comprises the steps of firstly filtering the circulating sewage by a multi-medium filter and ultrafiltration, then removing hardness by resin, and finally carrying out reverse osmosis and concentrated water reverse osmosis, wherein the conductivity of the treated water is lower, and then sending the produced water to a desalting station before primary RO or before secondary RO according to conductivity indexes, and carrying out a series of processes such as reverse osmosis and the like by the desalting station to obtain water which can be used as high-quality make-up water of the desalting station and change the configuration of the desalting station.
Description
Technical Field
The invention belongs to a sewage treatment process, and particularly relates to a method for treating and recycling circulating sewage with high desalting rate.
Background
With the development of industrial production, the water consumption is more and more, and the phenomenon of insufficient water supply occurs in many areas, so that reasonable and water-saving water becomes an important problem for developing industrial production, partial sewage of enterprises is generally required to be treated and recycled by themselves, and the recycling rate is generally required to be more than 70%.
The circulating water sewage is one kind of industrial waste water, and because the waste water contains various toxic substances, the polluted environment has great harm to human health, and the sewage can be discharged after being treated by adopting corresponding purification measures. At present, the main stream of circulating water sewage (namely clean sewage of a company) has the following two treatment processes:
the first is that the produced water obtained after the treatment of the circulating water sewage by the procedures of removing hardness by a double alkali method, ultra-filtering, Reverse Osmosis (RO) and the like is sent to a circulating water system to be used as make-up water; and the other is that the produced water obtained after the treatment of the circulating water sewage by the procedures of removing hardness by a double alkali method, ultrafiltration, Nanofiltration (NF) and the like is sent to a circulating water system to be used as make-up water.
Patent document CN201910516760.0 provides a method for treating circulating sewage, which comprises the steps of carrying out hardness removal filtration treatment, ozone oxidation treatment, denitrification treatment, ultrafiltration treatment and reverse osmosis treatment on the circulating sewage to obtain reverse osmosis water product, wherein the reverse osmosis water product is used for supplementing water for a circulating system. The method realizes the recovery of water resources on the basis of effectively treating the circulating sewage, and solves the problems of high hardness, suspended matters, COD (chemical oxygen demand) and salt content and difficult treatment of the circulating sewage. But the water quality obtained by the scheme is too good, and the water is wasted as circulating water replenishing water.
The patent application 200610150162.9 discloses a method for treating industrial circulating water sewage, which comprises flocculating settling and filtering industrial circulating water sewage, mixing part of the sewage directly as the water supplement of a circulating water system, treating the other part of the sewage by a nanofiltration system, and adding the mixture into the circulating water to achieve the purpose of recycling industrial circulating water and reducing the water supplement and sewage discharge of fresh water of the system. In order to enable the water body to meet the water inlet requirement of the nanofiltration membrane, the part of sewage needs to be pretreated, for example, the sewage described in the embodiment is subjected to flocculation, filtration and hollow fiber ultrafiltration before entering the nanofiltration membrane, so that the pretreatment investment required for preventing the membrane from scaling and prolonging the service life of the membrane is high in the implementation of the method, the nanofiltration membrane also has the defects that a large amount of acid and scale inhibitor are required to be consumed in the operation process, the operation cost is increased due to overhigh operation pressure, and the ion content in the outlet water is far less than the ion content required to be reserved in the circulating water system by utilizing the nanofiltration membrane treatment, so that the conductivity requirement of the circulating water for replenishing water cannot be met, and the resource waste is caused to a certain extent. Meanwhile, the content of chloride ions in the circulating water system cannot be reduced by adopting the circulating water sewage treated by the nanofiltration membrane, and the circulating water pipeline and equipment are corroded after the content of the chloride ions is accumulated.
Disclosure of Invention
The invention aims to provide a practical method for treating circulating water sewage with high desalting rate.
The invention realizes the technical purpose by the following technical means: a method for treating and recycling circulating sewage with high desalting rate comprises the following steps:
step 1, pretreating circulating water and sewage, namely introducing the circulating water and sewage (which can contain clean rainwater in a plant area, boiler sewage and other clean water) into a circulating water and sewage drainage pool for uniform collection, sending the sewage (or clean sewage) into a multi-media filter for filtering and precipitation by using a pump, adding a coagulant PAC (with the addition of 100-1500 ppm) and a coagulant aid anion PAM (with the addition of 0.1-5 ppm) into the front end of the integrated water purifier, filtering by using a quartz sand filtering layer at the rear end of the integrated water purifier to remove suspended matters and partial COD (chemical oxygen demand) in the sewage, wherein the suspended matters in the outlet water of the integrated water purifier can reach less than 5mg/l, the turbidity is less than 3NTU, the COD is less than 20mg/l, and the ammonia nitrogen is less than 3mg/l, and then discharging the water into a.
And 2, pumping the purified water in the intermediate water tank to a precision filter in front of the ultrafiltration device, and treating the purified water by the precision filter to ensure that suspended matters in outlet water can reach less than 2mg/l, turbidity is less than 1NTU, and COD is less than 10 mg/l.
And 3, enabling the outlet water of the precision filter to enter an ultrafiltration device, pressurizing the inlet water of the ultrafiltration to 0.2-0.3MPa by using an ultrafiltration inlet water pump, then enabling the inlet water of the ultrafiltration to enter the ultrafiltration device, wherein the total hardness of the inlet water of the ultrafiltration is less than 500mg/l, and the calcium hardness of the inlet water of the ultrafiltration is less than 250mg/l (if the total hardness of the inlet water of the ultrafiltration is more than the above numerical value, a front hardness removal device such as a high-density sedimentation tank or a double-alkali hardness removal device is required to be added to ensure the water yield of a subsequent device to be ensured), and after ultrafiltration treatment, the outlet.
Step 4, a small amount of ultrafiltration drainage is sent to the biochemical front end or directly enters circulating water to be used as make-up water;
and 5, if the total hardness of the ultrafiltration produced water is less than 200mg/l, filtering the produced water by a precision filter in front of the reverse osmosis device, treating the filtered water in the reverse osmosis device, treating the reverse osmosis concentrated water in the reverse osmosis device of the concentrated water, wherein the yield of the two-step reverse osmosis effluent reaches 70-95%, the conductivity is 20-100us/cm, and producing the qualified desalted water by a subsequent desalted water device.
And step 6, if the total hardness of the ultrafiltration water is 200-500mg/l, adding resin to remove the hardness, and then feeding the ultrafiltration water into an RO and concentrated water RO device after the total hardness of the ultrafiltration water is less than 200mg/l, otherwise, the RO water yield cannot be ensured.
And 7, sending the concentrated water generated by the concentrated water reverse osmosis device to a sewage advanced treatment device for further treatment or evaporating, crystallizing and extracting salt.
The invention has the following technical effects:
1) the invention can deeply couple the circulating sewage treatment system with the demineralized water system, the cleaner produced water from the ultrafiltration + RO + concentrated water RO device can be directly introduced into the RO (reverse osmosis) device of the demineralized water station, the reverse osmosis device in the demineralized water station can remove most of salt ions, the removal amount of the ions can be reduced through the process treatment of the demineralized water station, only a small amount of ions need to be removed, and high-quality make-up water is provided for the demineralized water station.
2) In addition, the ultrafiltration + RO + concentrated water RO device of the invention can not select a front hardness removing device under the condition of low hardness, thereby saving investment and operating cost.
3) In order to ensure the capacity of the desalted water and realize the real coupling of the desalted water device and the circulating water sewage discharge device, the invention can utilize rainwater, boiler sewage discharge water and other clean sewage produced in a factory rain drainage system.
Drawings
FIG. 1 is a flowchart of the processing procedure of the present invention.
Detailed Description
As shown in figure 1, the method for treating and recycling the circulating sewage with high desalting rate recommends the process flow as follows: circulating water sewage firstly passes through a multi-medium filtering or integrated water purifier, and is finally filtered by two steps of a precision filter and SF (ultra-filtration), the hardness is removed by resin, most of ions forming hardness in the filtered water are removed, the produced water is sent to an RO + concentrated water RO device for treatment, the produced water is sent to a primary RO or a secondary RO of a desalted water station according to the conductivity requirement, and is treated by a series of processes such as reverse osmosis of the desalted water station, and the obtained water can be used as high-quality make-up water of the desalted water station and can also change the configuration of the desalted water station.
The multi-medium filtering or integrated water purifier selected by the invention can also be replaced by other filtering equipment such as double-alkali filtering, coagulation filtering, high-density sedimentation tank and the like;
the step of removing hardness in the invention can be selected according to the hardness degree of water quality, and the step can be omitted when the hardness is low.
The specific implementation process of the invention is as follows:
step 1, pretreating circulating water and sewage, namely introducing the circulating water and sewage (which can contain clean rainwater in a plant area, boiler sewage and other clean water) into a circulating water and sewage drainage pool for uniform collection, sending the sewage (or clean sewage) to a multi-media filter for filtering and precipitation by using a pump, adding a coagulant PAC (with the addition of 100-1500 ppm) and a coagulant aid anion PAM (with the addition of 0.1-5 ppm) into the front end of the integrated water purifier, filtering the rear end of the integrated water purifier by using a quartz sand filtering layer to remove suspended matters and partial COD in the sewage, wherein the suspended matters in the outlet water of the integrated water purifier can reach less than 5mg/l, the turbidity is less than 3NTU, the COD is less than 20mg/l, and the ammonia nitrogen is less than 3mg/l, and then sending the effluent into a middle water pool.
And 2, pumping the purified water in the intermediate water tank to a precision filter in front of the ultrafiltration device, and treating the purified water by the precision filter to ensure that suspended matters in outlet water can reach less than 2mg/l, turbidity is less than 1NTU, and COD is less than 10 mg/l.
And 3, enabling the outlet water of the precision filter to enter an ultrafiltration device, pressurizing the inlet water of the ultrafiltration to 0.2-0.3MPa by adopting an ultrafiltration inlet water pump, then enabling the inlet water of the ultrafiltration to enter the ultrafiltration device, wherein the total hardness of the inlet water of the ultrafiltration is less than 500mg/l, and the calcium hardness of the inlet water of the ultrafiltration is less than 250mg/l (if the total hardness of the inlet water of the ultrafiltration is more than the above numerical value, a front hardness removal device such as a high-density sedimentation tank or a double-alkali hardness removal device is required to be added to ensure the water yield of a subsequent device), and after ultrafiltration treatment, the outlet water.
The ultrafiltration device can not select a front hardness removal device under the condition of low hardness, thereby saving investment and operating cost.
And 4, sending a small amount of ultrafiltration drainage to a biochemical front end or directly sending the ultrafiltration drainage to a circulating cooling water system to be used as make-up water, filtering ultrafiltration produced water such as water with low hardness which can be directly sent to a precision filter or a safety filter in front of a reverse osmosis device, sending filtered water into the reverse osmosis device for treatment, and sending concentrated water into a subsequent desalting device after passing through concentrated water RO (namely a concentrated water reverse osmosis device) to produce qualified desalted water.
The invention has the greatest improvement point that the desalination rate is high, monovalent ions and divalent ions are removed more thoroughly, and the water inlet quality of the primary or secondary RO of the desalination water station can be ensured more surely.
In summary, the relatively clean produced water from the ultrafiltration + RO + concentrated water RO device of the present invention, which only contains a small amount of ions, etc., can be directly introduced into the RO (reverse osmosis) device of the desalination station, the reverse osmosis device in the desalination station can remove the residual salt ions, and through the process treatment of the desalination station, the ion removal amount can be reduced, only a small amount of ions can be removed, the ultrafiltration and multi-media filtration devices, which are usually arranged in the desalination station before RO (reverse osmosis), can be saved, and high quality make-up water can be provided for the desalination station, and the method can save both the operation cost and the investment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. A method for treating and recycling circulating sewage with high desalting rate is characterized by comprising the following steps:
pretreating circulating water sewage, performing multi-medium filtration, namely introducing the circulating water sewage into a circulating water sewage disposal pool for uniform collection, then sending the sewage or clean sewage to a multi-medium filter for filtration and precipitation by using a pump, adding a PAC coagulant and a coagulant aid anion PAM at the front end of the integrated water purifier, filtering by using a quartz sand filter layer at the rear end of the integrated water purifier to remove suspended matters and partial Chemical Oxygen Demand (COD), and after the suspended matters, turbidity, COD and ammonia nitrogen in the outlet water of the integrated water purifier reach certain conditions, discharging water into a middle water pool;
purified water in the intermediate water tank is pumped to a precision filter in front of the ultrafiltration device, and after being treated by the precision filter, suspended matters in outlet water reach less than 2mg/l, turbidity is less than 1NTU, and COD is less than 10 mg/l;
the outlet water of the precision filter enters an ultrafiltration device, the ultrafiltration inlet water is pressurized by an ultrafiltration inlet pump and then enters the ultrafiltration device, the pressure of the inlet pump is 0.2-0.3MPa, after ultrafiltration treatment, the outlet water contains no suspended matters, and the SDI is less than 2;
a small amount of ultrafiltration drainage is sent to the biochemical front end or directly enters into circulating water to be used as make-up water;
if the total hardness of the ultrafiltration produced water is less than 200mg/l, filtering the ultrafiltration produced water by a precision filter in front of a reverse osmosis device, treating the filtered water in the reverse osmosis device, treating the reverse osmosis concentrated water in the concentrated water reverse osmosis device, wherein the yield of the two-step reverse osmosis effluent reaches 70-95%, the conductivity is 20-100us/cm, and producing the qualified desalted water by a subsequent desalted water device;
if the total hardness of the ultrafiltration water is 200-;
and (4) sending the concentrated water generated by the concentrated water reverse osmosis device to a sewage advanced treatment device for further treatment or evaporating, crystallizing and extracting salt.
2. The method for treating and recycling the sewage of the circulating water with high desalting rate as claimed in claim 1, wherein the multi-media filtration in the step (1) can be replaced by a double alkali method filtration, or a coagulation filtration, or a high-density sedimentation tank filtration device.
3. The method for treating and recycling the recycled sewage with high desalination rate as claimed in claim 1, wherein in the step (1), the recycled sewage comprises factory clean rainwater, boiler blow-down water and other clean blow-down water.
4. The method for treating and recycling the sewage of the circulating water with high desalination rate as claimed in claim 1, wherein in the step (1), 100-1500ppm coagulant PAC and 0.1-5ppm coagulant aid anion PAM are added at the front end of the integrated purified water, and the effluent enters the middle water tank after the suspended matters in the outlet water of the integrated water purifier reach less than 5mg/l, the turbidity is less than 3NTU, the COD is less than 20mg/l and the ammonia nitrogen is less than 3 mg/l.
5. The method for treating and recycling the sewage of the circulating water with high desalting rate as claimed in claim 1, wherein in the step (3), the ultrafiltration inlet water is pressurized to 0.2-0.3MPa by an ultrafiltration inlet water pump and then enters an ultrafiltration device, the total hardness of the ultrafiltration inlet water is less than 500mg/l, the calcium hardness is less than 250mg/l, and if the total hardness exceeds the above value, a hardness removing device is added before ultrafiltration so as to ensure the water yield of the subsequent device.
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| CN115521021A (en) * | 2022-04-11 | 2022-12-27 | 铜陵泰富特种材料有限公司 | Clean sewage mixing treatment and quality-based recycling system and method |
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