CN115521021A - Clean sewage mixing treatment and quality-based recycling system and method - Google Patents
Clean sewage mixing treatment and quality-based recycling system and method Download PDFInfo
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- CN115521021A CN115521021A CN202210375580.7A CN202210375580A CN115521021A CN 115521021 A CN115521021 A CN 115521021A CN 202210375580 A CN202210375580 A CN 202210375580A CN 115521021 A CN115521021 A CN 115521021A
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- 239000010865 sewage Substances 0.000 title claims abstract description 109
- 238000004064 recycling Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002156 mixing Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 455
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 91
- 239000012528 membrane Substances 0.000 claims abstract description 65
- 238000000926 separation method Methods 0.000 claims abstract description 44
- 239000000498 cooling water Substances 0.000 claims abstract description 21
- 238000011001 backwashing Methods 0.000 claims abstract description 11
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims description 24
- 238000000746 purification Methods 0.000 claims description 14
- 238000011033 desalting Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 125000000129 anionic group Chemical group 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
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- 238000001223 reverse osmosis Methods 0.000 description 45
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- 239000000126 substance Substances 0.000 description 10
- 238000001728 nano-filtration Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 8
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- 239000002351 wastewater Substances 0.000 description 6
- 238000004939 coking Methods 0.000 description 4
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- 239000003513 alkali Substances 0.000 description 3
- 238000005188 flotation Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
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- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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- 238000009300 dissolved air flotation Methods 0.000 description 1
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- 239000012510 hollow fiber Substances 0.000 description 1
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- 238000002844 melting Methods 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F3/00—Biological 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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
-
- 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
Abstract
The invention discloses a clean sewer mixed treatment and quality-based recycling system, which comprises a clean sewer raw water collecting pool, a water purifier, a clean sewer water purifying pool, a first filter, a first-stage UF ultrafiltration system, a first-stage UF ultrafiltration product pool, a second filter, a first-stage RO membrane separation system, a first-stage concentrated pool, a third filter, a water softening device, a softened water pool, a second-stage UF ultrafiltration system, a second-stage UF ultrafiltration product pool, a fourth filter and a second-stage RO membrane separation system which are sequentially connected, wherein the clean sewer raw water collecting pool is constructed to receive various kinds of sewage, and the various kinds of sewage comprise circulating cooling water discharge sewage, circulating water bypass filter backwashing water, boiler sewage, desalted water station neutralization pool sewage and steam condensate. The clean sewage mixing treatment and quality-based recycling system can reduce resource waste and save labor and operation cost. The invention also discloses a method for mixing and treating the clean sewage and recycling the clean sewage according to the quality.
Description
Technical Field
The invention belongs to the technical field of water treatment in coking or chemical industry, and particularly relates to a system and a method for mixed treatment and separate recycling of clean sewage.
Background
Clean offal from the coking or chemical industry generally comprises: the circulating cooling water discharges sewage, the circulating water by-pass filter backwashing water, the boiler continuous or fixed discharge sewage, the desalted water station neutralization tank sewage, slightly polluted steam condensate and other sewages.
Along 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, enterprises are generally required to treat and recycle discharged sewage per se, and the recycling rate is required to be more than 70%.
The circulating water sewage is one kind of industrial wastewater, and because various toxic substances are contained in the wastewater, the polluted environment has great harm to human health, and the wastewater can be discharged after being treated by adopting corresponding purification measures. The current mainstream circulating water sewage is generally treated independently, and the following two treatment processes are adopted:
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 second method is that the produced water obtained after the circulating water sewage is treated 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 CN112079518A discloses a treatment method of circulating water 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 water sewage to obtain reverse osmosis product water, wherein the reverse osmosis product water is used for supplementing water to a circulating system. The method realizes the recovery of water resources on the basis of effectively treating the circulating water sewage, and solves the problems that the circulating water sewage is high in hardness, suspended matters, COD (chemical oxygen demand) and salt content and difficult to treat. But the water quality obtained by the scheme is too good, and the water is wasted as circulating water replenishing water.
The patent document with publication number CN101172724A discloses a treatment method of industrial circulating water sewage, which is characterized in that after flocculation precipitation and filtration treatment, one part of the industrial circulating water sewage is directly used as water supplement of a circulating water system for recycling, and the other part of the industrial circulating water sewage is treated by a nanofiltration system for recycling, and the two parts are mixed according to a certain proportion and then added into the circulating water, so that the purposes of recycling the industrial circulating water and reducing the water supplement amount and the sewage discharge amount of fresh water of the system are achieved. 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 present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a clean sewer mixed treatment and quality-based recycling system, and aims to reduce resource waste and reduce operation cost.
In order to achieve the purpose, the invention adopts the technical scheme that: clean offal mixed treatment and branch matter recycling system, including the clean raw water collecting pit of offal that connects gradually, the water purifier, clean offal clean water reservoir, first filter, one-level UF ultrafiltration system, one-level UF ultrafiltration product pond, the second filter, one-level RO membrane separation system, one-level concentrated water tank, the third filter, water softener, the softened water pond, second grade UF ultrafiltration system, second grade UF ultrafiltration product pond, fourth filter and second grade RO membrane separation system, clean raw water collecting pit of offal is constructed and is used for receiving multiple blow off water, multiple blow off water is including circulating cooling water sewer, the other filter backwash water of circulating water, boiler blow off water, remove in the salt solution station and pond blow off water and steam condensate water.
The temperature of the boiler blow-off water is 20-40 ℃ after the waste heat is utilized or cooled.
The water purifier is added with 50-80ppm polyaluminium PAC and 1-2ppm anionic PAM.
The first filter is one of a ceramic tube filter, a flat ceramic membrane filter, a porcelain sand filter, a multi-medium filter or a high-speed filter.
The second filter and the fourth filter are security filters, the third filter is an activated carbon filter, and the COD content in the concentrated water discharged from the third filter is not more than 60mg/l.
The invention also provides a clean sewage mixing treatment and quality-based recycling method, which adopts the clean sewage mixing treatment and quality-based recycling system and comprises the following steps:
s1, adding various sewage into a clean sewer raw water collecting pool;
s2, enabling outlet water of the clean sewer raw water collecting tank to enter a water purifier;
s3, enabling the effluent of the water purifier to enter a clean effluent water purification tank;
s4, enabling the outlet water of the clean outlet water purification tank to enter a first filter;
s5, enabling the effluent of the first filter to enter a primary UF ultrafiltration system;
s6, enabling the effluent of the primary UF ultrafiltration system to enter a primary UF ultrafiltration water production tank;
s7, enabling the effluent of the primary UF ultrafiltration water production tank to enter a second filter;
s8, enabling the effluent of the second filter to enter a primary RO membrane separation system;
s9, enabling concentrated water in the effluent of the primary RO membrane separation system to enter a primary concentrated water tank 9, enabling produced water to enter a middle water tank and finally enter a primary desalting water tank;
s10, enabling the effluent of the primary concentrated water tank to enter a third filter;
s11, enabling the effluent of the third filter to enter a water softening device;
s12, enabling the water discharged from the water softening device to enter a water softening pool;
s13, enabling the effluent of the softened water tank to enter a secondary UF ultrafiltration system;
s14, enabling outlet water of the secondary UF ultrafiltration system to enter a secondary UF ultrafiltration water production tank;
s15, enabling the effluent of the secondary UF ultrafiltration water production tank to enter a fourth filter;
s16, enabling the effluent of the fourth filter to enter a secondary RO membrane separation system;
s17, enabling concentrated water in the effluent of the secondary RO membrane separation system to enter a biochemical water deep treatment system 16, and enabling produced water to enter a circulating water supplementing water system.
In the step S6, 20-30% of the total water yield of the primary UF ultrafiltration water generating tank is directly used as circulating water make-up water, and the circulating water make-up water is added into a circulating water make-up water system.
In the step S14, backwash water generated by the secondary UF ultrafiltration system is added to the clean raw sewage collecting tank.
In the step S7, 70-80% of ultrafiltration product water in the primary UF ultrafiltration product water tank is conveyed to the second filter.
The clean effluent raw water collecting tank and the clean effluent clean water tank are internally provided with a COD detector and an ammonia nitrogen detector for monitoring the fluctuation condition of the raw water quality.
The clean sewage mixing treatment and quality-based recycling system disclosed by the invention can be used for mixing and treating the sewage discharged by circulating cooling water, the backwashing water of a circulating water bypass filter, the boiler continuous or fixed-discharge sewage, the sewage discharged by a neutralization pond of a desalted water station, slightly polluted steam condensate and other sewage into clean sewage, so that the resource waste can be reduced, the equipment investment is reduced, the process operation is simplified, the automation is easy to realize, and the labor and the operation cost are saved.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic view of the construction of the clean sewer mixed treatment and separate recycling system of the present invention;
labeled in the figure as: 1. cleaning a sewage raw water collecting tank; 2. a water purifier; 3. cleaning a sewage purification tank; 4. a first filter; 5. a primary UF ultrafiltration system; 6. a first-stage UF ultrafiltration water-producing tank; 7. a second filter; 8. a first-stage RO membrane separation system; 9. a first-stage concentrated water tank; 10. a third filter; 11. a water softening device; 12. a secondary UF ultrafiltration system; 13. a second-stage UF ultrafiltration water production tank; 14. a fourth filter; 15. a secondary RO membrane separation system; 16. a biochemical water deep treatment system; 17. a circulating water make-up system; 18. a middle water pool; 19. a first-stage desalter tank; 20. and (4) softening the water tank.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to help those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to help them implement, by referring to the accompanying drawings and the description of the embodiments.
It should be noted that, in the following embodiments, the terms "first", "second", "third" and "fourth" do not represent absolute differences in structure and/or function, nor represent a sequential order of execution, but merely serve to facilitate description.
As shown in fig. 1, the present invention provides a clean sewage mixed treatment and quality-based recycling system, which comprises a clean sewage raw water collecting tank 1, a water purifier 2, a clean sewage purifying tank 3, a first filter 4, a primary UF ultrafiltration system 5, a primary UF ultrafiltration water production tank 6, a second filter 7, a primary RO membrane separation system 8, a primary concentrated water tank 9, a third filter 10, a water softener 11, a softened water tank 20, a secondary UF ultrafiltration system 12, a secondary UF ultrafiltration water production tank 13, a fourth filter 14 and a secondary RO membrane separation system 15, which are connected in sequence. The clean sewer raw water collecting tank 1 is configured to receive various kinds of sewage including circulating cooling water discharge sewage, circulating water bypass filter backwash water, boiler sewage, desalter station neutralization tank sewage, and steam condensate. The sewage discharged by the desalting water station and the neutralizing tank is wastewater generated by the desalting water station and the neutralizing tank, and the boiler sewage is wastewater generated by a boiler. The circulating cooling water discharge sewage is from a circulating cooling water system, and in order to keep a certain concentration multiple (generally controlled at 3-4 times) of the circulating cooling water system, for example, the concentration multiple exceeding 4 times increases the ion concentration in the circulating cooling water, the circulating cooling water system is easy to scale or corrode, a part of circulating cooling water needs to be discharged and fresh water needs to be supplemented, and the part of discharged circulating cooling water is the circulating cooling water discharge sewage. The steam condensate comes from a system adopting steam indirect heating, for example, a sulfur melting kettle adopting steam to indirectly heat sulfur foam in a coking enterprise, and after the sulfur foam is heated, the steam is condensed into steam condensate to be discharged. The backwashing water of the circulating water by-pass filter comes from a circulating cooling water system, the circulating cooling water system is provided with the by-pass filter for filtering the circulating cooling water in order to reduce the turbidity of the system to less than 10NTU, the by-pass filter needs regeneration backwashing after being used for a period of time, and the generated backwashing water is the backwashing water of the circulating water by-pass filter.
The invention aims to solve the problems that when the clean sewage in the coking or chemical industry is treated and reused, the sewage is respectively treated because of different water quality, and the treated sewage is completely sent to circulating water as make-up water, so that the quality of the circulating water is too good, and further a circulating water system is easy to corrode. The system and the method have the advantages of low energy consumption and material consumption, and the problem that different types of clean sewage are respectively treated and are sent to circulating water as make-up water after treatment is effectively solved.
As shown in figure 1, the sewage discharged by the circulating cooling water, the backwashing water of the circulating water side-filtration filter, the boiler sewage (including the continuous or fixed discharge sewage), the sewage discharged by the neutralization pond of the desalted water station, the slightly polluted steam condensate and other sewage are uniformly fed into the clean sewage raw water collecting pond 1 through a collecting pipeline. Wherein, the boiler blow-off water needs to recover the waste heat and is properly cooled, and the boiler blow-off water enters the clean sewage raw water collecting tank 1 after being cooled to 20-40 ℃. If the sewage is not cooled, the sewage at about 100 ℃ directly enters a membrane treatment system, so that UF ultrafiltration and RO reverse osmosis system membranes are damaged, and energy is wasted.
The water purifier 2 is preferably an integrated fully automatic water purifier, and as shown in fig. 1, the clean sewage in the clean sewage raw water collecting tank 1 is lifted to the water purifier 2 by a water pump and is treated by the water purifier 2. Adding chemicals into the water purifier 2, wherein 50-80ppm of polyaluminium PAC (liquid containing 6% of aluminium oxide) and 1-2ppm of anionic PAM (molecular weight 800-1000 ten thousand) are added into the water purifier 2. After the water purifier 2 is used for treatment, the turbidity of suspended matters in the effluent of the water purifier 2 is less than or equal to 5NTU.
As shown in fig. 1, the effluent of the water purifier 2 enters a clean effluent water purification tank 3, the effluent of the clean effluent water purification tank 3 is lifted to a first filter 4 by a water pump for filtration, and the effluent of the first filter 4 enters a primary UF ultrafiltration system 5 for filtration. The ultrafiltration membrane of the primary UF ultrafiltration system 5 takes the pressure difference between two sides of the membrane as a driving force, the ultrafiltration membrane as a filter medium, and only water and small molecular substances can pass through the ultrafiltration membrane to form permeate liquid and substances with the volume larger than the micropore diameter of the membrane surface are intercepted to form concentrated liquid under a certain pressure when the stock solution flows through the membrane surface, so that the purification, separation and concentration of the stock solution are realized, and the turbidity of the effluent of the primary UF ultrafiltration system 5 is less than or equal to 1NTU. The effluent of the primary UF ultrafiltration system 5 enters a primary UF ultrafiltration water production tank 6.
Preferably, the first filter 4 is a high efficiency filter, and the first filter 4 may be one of a ceramic tube filter, a flat ceramic membrane filter, a porcelain sand filter, a multi-media filter, a high speed filter, and the like. The first filter 4 and the primary UF ultrafiltration system 5 are connected with the clean sewer raw water collecting tank 1, and backwash water generated by the first filter 4 is added into the clean sewer raw water collecting tank 1. Backwash water generated by the first filter 4 and the primary UF ultrafiltration system 5 is about 10% of ultrafiltration water yield, returns to the clean sewage raw water collecting tank 1 through a backwash pump, and is reprocessed through the water purifier 2.
As shown in fig. 1, the primary UF ultrafiltration water-producing tank 6 is connected to a circulating water make-up water system 17, and the effluent of the primary UF ultrafiltration water-producing tank 6 basically meets the water quality requirement of the circulating water make-up water except for the hardness index, so 20-30% of the total water amount of the clean sewer ultrafiltration water-producing water is directly used as the circulating water make-up water.
As shown in fig. 1, the second filter 7 is a cartridge filter, the effluent of the first-stage UF ultrafiltration effluent tank 6 is lifted to the second filter 7 by a water pump for filtration, the effluent of the second filter 7 enters a first-stage RO membrane separation system 8, and the first-stage RO membrane separation system 8 is connected with a reclaimed water tank 18 and a first-stage concentrated water tank 9. The ultrafiltration water production of 70-80% of the first-stage UF ultrafiltration water production tank 6 enters a second filter 7 through a lifting pump, the water is filtered through the second filter 7, the pressure is lifted by a high-pressure pump and then enters a first-stage RO membrane separation system 8, the concentrated water generated by the first-stage RO membrane separation system 8 enters a first-stage concentrated water tank 9, the rest of the water produced in the first-stage RO membrane separation system 8 enters a middle water tank 18, the water in the middle water tank 18 is pumped to a first-stage desalting water tank 19 through a water pump to be used as first-stage desalting water, and the water can also be returned to each circulating water replenishing point to be used as circulating water replenishing water.
As shown in figure 1, the outlet water of the first-stage concentrated water tank 9 enters a third filter 10 for filtration, the outlet water of the third filter 10 enters a water softening device 11, and the COD content in the concentrated water discharged from the third filter 10 is not more than 60mg/l. The third filter 10 is an activated carbon filter, organic matter treatment is carried out through an activated carbon filter material, concentrated water enters the full-automatic water softening device 11 after COD (chemical oxygen demand) of the concentrated water is not more than 60mg/l, calcium ions, magnesium ions and the like in the concentrated water are removed through the full-automatic water softening device 11, and the total hardness is less than 150mg/l. The water softener 11 may be one of a resin softener and a double alkali softener.
As shown in fig. 1, the water softening device 11 is connected to the biochemical water deep treatment system 16, the regeneration liquid generated by the water softening device 11 enters the biochemical water deep treatment system 16 for deep treatment, the produced water of the water softening device 11 enters the water softening tank 20, the water in the water softening tank 20 is lifted to the second-stage UF ultrafiltration system 12 by the water pump for filtration, and the produced water of the second-stage UF ultrafiltration system 12 enters the second-stage UF ultrafiltration water production tank 13.
As shown in fig. 1, the effluent of the secondary UF ultrafiltration water production tank 13 enters a fourth filter 14, the effluent of the fourth filter 14 enters a secondary RO membrane separation system 15 through a booster pump, and the secondary RO membrane separation system 15 is connected with a circulating water make-up water system 17 and a biochemical water deep treatment system 16. The fourth filter 14 is a cartridge filter, after the water entering the membrane is protected by the cartridge filter, the pressure is increased by a high-pressure pump and then the water enters a second-stage RO membrane element, the concentrated water generated by the second-stage RO membrane separation system 15 enters a biochemical water deep treatment system 16 for deep treatment, and the rest of the produced water in the second-stage RO membrane separation system 15 enters a circulating water supplementing water system 17. The water produced by the secondary RO membrane separation system 15 has extremely low hardness, and the water yield accounts for about 8-12% of the water yield of the primary UF ultrafiltration and can be directly used as make-up water of circulating water.
As shown in fig. 1, backwash wastewater generated by the third filter 10 and the two-stage UF ultrafiltration system 12 is returned to the clean raw sewage collecting tank 1 by a backwash pump and is reprocessed by the water purifier 2.
As shown in fig. 1, a COD detector and an ammonia nitrogen detector are arranged in the clean sewage raw water collecting tank 1 and the clean sewage water purification tank 3, and the COD detector and the ammonia nitrogen detector perform online detection to monitor the fluctuation of raw water quality at any time, so that measures can be taken in time when the water quality is abnormal, and protection is provided for a membrane system.
The invention also provides a clean sewage mixing treatment and quality-based recycling method, which adopts the clean sewage mixing treatment and quality-based recycling system with the structure and comprises the following steps:
s1, adding various kinds of sewage into a clean sewer raw water collecting tank 1, wherein the various kinds of sewage comprise circulating cooling water sewage, circulating water bypass filter backwashing water, boiler sewage, desalted water station neutralization tank sewage and steam condensate;
s2, the effluent of the clean effluent raw water collecting tank 1 enters a water purifier 2;
s3, the effluent of the water purifier 2 enters a clean effluent water purification tank 3;
s4, the outlet water of the clean sewage purification tank 3 enters a first filter 4;
s5, enabling the effluent of the first filter 4 to enter a primary UF ultrafiltration system 5;
s6, enabling effluent of the primary UF ultrafiltration system to enter a primary UF ultrafiltration water production tank 6;
s7, enabling effluent of the primary UF ultrafiltration water production tank 6 to enter a second filter 7;
s8, enabling the effluent of the second filter 7 to enter a first-stage RO membrane separation system 8;
s9, enabling concentrated water in the effluent of the primary RO membrane separation system to enter a primary concentrated water tank 9, enabling produced water to enter a middle water tank and finally enter a primary desalting water tank;
s10, the effluent of the primary concentrated water tank 9 enters a third filter 10;
s11, the effluent of the third filter 10 enters a water softening device 11;
s12, the water outlet of the water softening device 11 enters a water softening pool 20;
s13, the effluent of the softened water tank 20 enters a secondary UF ultrafiltration system 12;
s14, enabling effluent of the secondary UF ultrafiltration system 12 to enter a secondary UF ultrafiltration water production tank 13;
s15, enabling the effluent of the secondary UF ultrafiltration water production tank 13 to enter a fourth filter 14;
s16, the effluent of the fourth filter 14 enters a secondary RO membrane separation system 15;
s17, enabling concentrated water in the effluent of the secondary RO membrane separation system to enter a biochemical water deep treatment system 16, and enabling produced water to enter a circulating water supplementing water system 17.
In the step S1, the boiler blow-off water is cooled to 20-40 ℃ and then enters the clean sewer raw water collecting pool 1.
In step S2, the clean sewage in the clean sewage raw water collecting tank 1 is lifted to the water purifier 2 by the water pump, and is treated by the water purifier 2. Adding chemicals into the water purifier 2, wherein 50-80ppm of polyaluminium PAC (liquid containing 6% of aluminium oxide) and 1-2ppm of anionic PAM (molecular weight 800-1000 ten thousand) are added into the water purifier 2. After the water purifier 2 is used for treatment, the turbidity of suspended matters in the effluent of the water purifier 2 is less than or equal to 5NTU.
In step S4, the backwash water produced by the first filter 4 is returned to the clean sewer raw water collection tank 1 by the backwash pump and is reprocessed by the water purifier 2.
In step S5, backwash water in the primary UF ultrafiltration system 5, which accounts for 10% of the total water yield, is added to the clean sewer raw water collection tank 1 and is reprocessed by the water purifier 2.
In the above step S6, 20-30% of the total water yield of the primary UF ultrafiltration water production tank 6 is directly used as the circulating water make-up water, and the circulating water make-up water is added to the circulating water make-up water system 17.
In the step S7, 70-80% of the ultrafiltration product water in the primary UF ultrafiltration product water tank 6 enters the second filter 7 through the booster pump to be filtered. In step S8, the water is filtered by the second filter 7, and then the pressure is raised by the high-pressure pump and the water enters the first-stage RO membrane separation system 8. In the step S9, the concentrated water generated by the first-stage RO membrane separation system 8 enters the first-stage concentrated water tank 9, the remaining water generated by the first-stage RO membrane separation system 8 enters the middle water tank 18, and the water in the middle water tank 18 is pumped to the first-stage desalting water tank 19 by a water pump to be used as first-stage desalting water, and can also be returned to each circulating water replenishing point to be used as circulating water replenishing water.
In the step S10, the effluent of the first-stage concentrated water tank 9 enters the third filter 10 for filtration, and the COD content in the concentrated water discharged from the third filter 10 is not more than 60mg/l.
In the step S11, the effluent of the third filter 10 enters the water softener 11, and the calcium and magnesium plasma in the concentrated water is removed by the fully automatic water softener 11, so that the total hardness of the effluent of the water softener 11 is less than 150mg/l.
In step S12, the water softener 11 is connected to the biochemical water deep treatment system 16, the regeneration liquid generated by the water softener 11 enters the biochemical water deep treatment system 16 for deep treatment, and the produced water of the water softener 11 enters the water softening tank 20. In the above step S13, the water in the softened water tank 20 is pumped to the second UF ultrafiltration system 12 for filtration.
In the step S14, the effluent of the secondary UF ultrafiltration system 12 enters the secondary UF ultrafiltration water production tank 13, and the backwash water produced by the secondary UF ultrafiltration system 12 is added to the clean sewer raw water collecting tank 1.
In the above step S15, the effluent of the secondary UF ultrafiltration water production tank 13 enters the fourth filter 14, and the fourth filter 14 is a cartridge filter.
In the step S16, after the water is filtered by the fourth filter 14, the pressure is raised by the high-pressure pump and the water enters the second-stage RO membrane separation system 15, the concentrated water generated by the second-stage RO membrane separation system 15 enters the biochemical water advanced treatment system 16 for advanced treatment, and the rest of the produced water in the second-stage RO membrane separation system 15 enters the circulating water make-up water system 17. The water produced by the secondary RO membrane separation system 15 has extremely low hardness, and the water yield accounts for about 8-12% of the water yield of the primary UF ultrafiltration and can be directly used as make-up water of circulating water.
The clean sewage mixing treatment and quality-based recycling system and method have the following advantages:
1. the sewage discharged by the circulating cooling water discharge device, the circulating water bypass filter backwashing water, the boiler continuous or fixed discharge sewage, the brine removal station neutralization pond sewage, slightly polluted steam condensate and other sewage are mixed into clean sewage and are treated together, so that the equipment investment can be reduced, the process operation is simplified, the automation is easy to realize, and the labor and the operation cost are saved.
2. The clean sewage is treated by a secondary UF ultrafiltration system and an RO membrane separation system, so that the water yield can be improved to the maximum extent and can reach more than 90 percent, and the concentrated water treatment capacity is reduced.
3. The clean sewage is treated by secondary UF + RO to respectively obtain primary RO produced water and secondary RO produced water, the quality of the primary RO membrane separation system is better, the conductivity of the produced water of the primary RO membrane separation system can reach less than or equal to 30us/cm, the water can be used as primary desalted water and sent to a desalted water station, the water production cost of the desalted water station is greatly reduced, and meanwhile, the income of the clean sewage recycling treatment device is improved due to the higher price of the primary desalted water; the conductivity of the produced water of the secondary RO membrane separation system can reach less than or equal to 200us/cm, the produced water can be used as better circulating water make-up water, the hardness is 0, and the produced water can be mixed with 20-30% of primary UF produced water to comprehensively meet the requirement of the circulating water make-up water.
4. 20-30% of the produced water of the primary UF ultrafiltration system is directly used as circulating water make-up water, so that the cost of the circulating water make-up water can be greatly reduced.
5. COD and ammonia nitrogen on-line detection are arranged in the clean sewage raw water collecting tank and the clean sewage water purification tank, so that a membrane system can be protected, upstream incoming water can be effectively monitored, and upstream processes can be checked in time.
6. Through chemical treatment in the integrated full-automatic water purifier, total phosphorus in phosphorus-containing wastewater such as circulating water and sewage entering a clean sewage raw water collecting pool can be treated together, and the phosphorus is further precipitated together with suspended matters in the integrated water purifier and a subsequent high-efficiency filter, so that the total phosphorus in the effluent can be reduced by about 40-90%, and the load of subsequent total phosphorus treatment is reduced. The treated water with low phosphorus concentration can enter circulating water to be used as make-up water, and the normal use of a low phosphorus water treatment agent in a circulating cooling water system cannot be influenced.
7. If the clean raw sewage contains more oil, a high-efficiency air flotation device such as a rotational flow dissolved air flotation device or a nanometer air flotation device can be arranged between the water purifier and the clean raw sewage collecting pool for oil removal, or an oil removal filter is arranged between the water purifier and the clean raw sewage collecting pool for oil removal, and the effluent of the clean raw sewage collecting pool 1 is subjected to oil removal through the high-efficiency air flotation device or the oil removal filter and then enters the water purifier for treatment.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Any insubstantial improvements over the methods and technical solutions of the present invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (10)
1. Clean offal mixed treatment and branch matter recycling system, a serial communication port, including the clean offal raw water collecting pit that connects gradually, the water purifier, clean offal water purification pond, first filter, one-level UF ultrafiltration system, one-level UF ultrafiltration product pond, the second filter, one-level RO membrane separation system, one-level concentrated water pond, the third filter, water softener, soften the pond, second grade UF ultrafiltration system, second grade UF ultrafiltration product pond, fourth filter and second grade RO membrane separation system, clean offal raw water collecting pit is constructed and is used for receiving multiple blow off water, multiple blow off water is including circulating cooling water drainage sewage, circulating water side filters filter backwashing water, boiler blow off water, desalting station neutralization pond blow off water and steam condensate.
2. The clean sewage mixing treatment and quality-based recycling system according to claim 1, wherein the temperature of the boiler sewage is 20-40 ℃ after waste heat utilization or cooling.
3. The system according to claim 1, wherein the water purifier is filled with polyaluminium-PAC in an amount of 50-80ppm and anionic PAM in an amount of 1-2 ppm.
4. The clean offal mixing treatment and quality-grading recycling system according to any one of claims 1 to 3, wherein the first filter is a ceramic tube filter, a flat ceramic membrane filter, a porcelain sand filter, a multi-media filter or a high-speed filter.
5. The clean sewage mixing treatment and quality-dividing recycling system according to any one of claims 1 to 3, wherein said second filter and said fourth filter are cartridge filters, said third filter is an activated carbon filter, and the COD content in the concentrated water discharged from the third filter is not more than 60mg/l.
6. The method for mixing, treating and recycling the clean sewage according to the quality, which is characterized in that the system for mixing, treating and recycling the clean sewage according to the claims 1 to 5 is adopted, and the method comprises the following steps:
s1, adding various sewage into a clean sewer raw water collecting pool;
s2, enabling the effluent of the clean effluent raw water collecting tank to enter a water purifier;
s3, enabling the effluent of the water purifier to enter a clean effluent water purification tank;
s4, enabling outlet water of the clean outlet water purification tank to enter a first filter;
s5, enabling the effluent of the first filter to enter a primary UF ultrafiltration system;
s6, enabling the effluent of the primary UF ultrafiltration system to enter a primary UF ultrafiltration water production tank;
s7, enabling the effluent of the primary UF ultrafiltration water production tank to enter a second filter;
s8, enabling the effluent of the second filter to enter a primary RO membrane separation system;
s9, enabling concentrated water in outlet water of the primary RO membrane separation system to enter a primary concentrated water tank, enabling produced water to enter a medium water tank and finally enter a primary desalting water tank;
s10, enabling the effluent of the primary concentrated water tank to enter a third filter;
s11, enabling the effluent of the third filter to enter a water softening device;
s12, enabling the water discharged from the water softening device to enter a water softening pool;
s13, enabling the effluent of the softened water tank to enter a secondary UF ultrafiltration system;
s14, enabling outlet water of the secondary UF ultrafiltration system to enter a secondary UF ultrafiltration water production tank;
s15, enabling the effluent of the secondary UF ultrafiltration water production tank to enter a fourth filter;
s16, enabling the effluent of the fourth filter to enter a secondary RO membrane separation system;
s17, enabling concentrated water in the effluent of the secondary RO membrane separation system to enter a biochemical water deep treatment system, and enabling produced water to enter a circulating water supplementing water system.
7. The clean sewage mixing treatment and quality-based recycling method according to claim 6, wherein in step S6, 20-30% of the total water yield of the primary UF ultrafiltration water generating tank is directly used as circulating water make-up water, and the circulating water make-up water is added into the circulating water make-up water system.
8. The method according to claim 6, wherein the backwash water generated by the secondary UF ultrafiltration system is added to the raw clean sewage collecting tank in step S14.
9. The clean sewage mixing treatment and quality-based recycling method according to claim 6, wherein in step S7, 70-80% of the ultrafiltration product water in the primary UF ultrafiltration product water tank is delivered to the second filter.
10. The method for mixed treatment and separate reuse of clean sewer according to any of claims 1 to 9, wherein a COD detector and an ammonia nitrogen detector for monitoring the fluctuation of the quality of raw water are disposed in the clean sewer raw water collecting tank and the clean sewer clear water tank.
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| CN203360184U (en) * | 2013-07-30 | 2013-12-25 | 久泰能源内蒙古有限公司 | Strong brine treating and recovering system |
| CN209702456U (en) * | 2019-03-27 | 2019-11-29 | 重庆万盛煤化有限责任公司 | Dimethyl ether combined production of methanol near-zero release intermediate water reuse system |
| CN112939368A (en) * | 2021-03-04 | 2021-06-11 | 铜陵泰富特种材料有限公司 | Circulating water sewage treatment and recycling method with high desalting rate |
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