CN106082501B - Boiler blowdown water recovery processing technique based on ion exchange and chemical precipitation - Google Patents
Boiler blowdown water recovery processing technique based on ion exchange and chemical precipitation Download PDFInfo
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- CN106082501B CN106082501B CN201610654150.3A CN201610654150A CN106082501B CN 106082501 B CN106082501 B CN 106082501B CN 201610654150 A CN201610654150 A CN 201610654150A CN 106082501 B CN106082501 B CN 106082501B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
Abstract
The present invention relates to the boiler blowdown water recovery processing techniques based on ion exchange and chemical precipitation, comprising the following steps: boiler blowdown water is filtered by high-efficiency fiber filter, makes the haze reduction to less than 1NTU that filter after-purification sewerage, SDI value is less than 3；Filtered purification sewerage is delivered to ion-exchanger, enters boiler original water water tank by the water outlet that anion exchange resin exchanges, is regenerated using regenerative agent after anion exchange resin saturation to restore the function of exchange of anion exchange resin；Coagulation, flocculation sedimentation processing are carried out to the regeneration liquid waste and backwash waste liquid of ion-exchanger using coagulant, flocculant.Compared with prior art, the present invention is while realizing the high-quality recycling to boiler blowdown water using ion exchange, it is acted on using coagulation, flocculating setting, add a small amount of coagulation, flocculation aid, the waste liquid of high concentration or regenerated liquid is realized to be separated by solid-liquid separation, phosphatic removal in boiler blowdown water is completed, realizes the zero-emission of boiler blowdown water.
Description
Technical field
The present invention relates to boiler blowdown water recovery processing techniques, more particularly, to the pot based on ion exchange and chemical precipitation
Fire grate sewage recovery processing technique, belongs to technical field of water pollution control.
Background technique
With the rapid expansion of industry, agricultural great development and urbanization, China's shortage of water resources phenomenon is more prominent, and
It solves the problems, such as shortage of water resources, relies solely on that open up new water source far from enough, and this water intaking cost is being stepped up,
Difficulty is also increasing, meanwhile, the utilization of interior China water resource is but quite extensive at this stage.With going out for new policy of saving water and energy
Platform is objectively required us and is thought deeply the control of industrial water pollution using the theory of circular economy and improve industrial water resource
Recycling rate of waterused.New environmental protection policy puts into effect the research, exploitation and application for also having pushed directly on water-saving and emission-reducing technology, if
It rationally can even be related to the survival and development of an enterprise using various environment protection novels.
Water rich and influential family boiler water system is used as each production plant area, water consumption is only second to industrial circulating water system, accounts for
The 5~10% of entire industrial water consumption.For the operation of boiler water system, how to develop new technology rationally run boiler and its
Using boiler water resource, there is important environment protection significance.For boiler water system, fouling and corruption are generated in the boiler in order to prevent
Erosion generally requires and carries out phosphate treated to boiler system, i.e., is usually added into certain density phosphate in boiler feedwater, with
Guarantee that boiler feedwater enters the possible remnants Ca in furnace2+Scale will not be directly formed, but generates grain slag with phosphate reaction,
Then it is excluded by boiler blow-off, this phosphorus for adding phosphatic processing method into boiler feedwater and being known as boiler feedwater
Hydrochlorate processing.Phosphate treatment method is the general processing method of current boiler water system, and treatment process is convenient, economical, efficient,
And other boiler method for treating water are difficult to replace, therefore the phosphate treated technology of boiler feedwater at present is still generally existing
With use.According to the water quality characteristic of boiler water system, boiler blowdown water generally falls into " peace and quiet " sewerage, i.e. phosphate anion is
The index of its water quality discharge is uniquely influenced, while after completing to the removal of phosphate anion in boiler blowdown water, still being had
There is the recovery value of high-quality, can be used directly as boiler feedwater or raw water, therefore research can well remove pot
The phosphatic technology of the various existence forms of furnace system has Important Economic interests and environment protection significance.
Phosphate minimizing technology for boiler blowdown water mainly includes bioanalysis, chemical precipitation method, absorption method etc..Its
In, bioanalysis and chemical precipitation method are most widely used in sewage treatment, but due to being lower content in boiler blowdown water
Inorganic phosphate, it is phosphatic to be predominantly in the form of the phosphate anion ionized completely in boiler water system, to blowdown
The stronger bioanalysis of organic concentration dependence is not suitable for substantially in waste water.For the minimizing technology of inorganic phosphate, answer at present
With relatively broad still chemical precipitation method.
Chemical precipitation method is using metal caused by chemical agent (molysite, aluminium salt and calcium salt etc.) to phosphatic removal
After ion and phosphate ion generate insoluble phosphate sediment, gone by the method for chemical precipitation, flocculation and separation of solid and liquid
Except phosphate in sewerage.The most common metal salt of chemical precipitation dephosphorization mainly has ferric trichloride, ferric sulfate, ferrous sulfate, sulphur
Sour aluminium, lime and polymer of the above metal salt etc..
Etal molysite removes the technology mechanism and process of dephosphorization are as follows: after molysite is dissolved in water, iron ion is formed with phosphate ion
Indissoluble salt occurs hydrolysis and polymerization reaction by dissolving and absorbing water, produces Fe2(OH)2 4+、Fe3(OH)4 5+、Fe5(OH)9 6+Deng
A variety of iron content multinuclear hydroxo complex, can effectively eliminate or reduce the Zeta potential of water-borne glue body, and make coacervation of colloid, pass through
Chemical precipitation separates and removes phosphate.Fe3+The optimal pH of chemical dephosphorization is 4.5~5.0, Fe2+Chemical dephosphorization it is best
PH value is 7.0~8.0.Fe2+Be not easy to react generation precipitating under alkaline condition with phosphate ion, to a certain degree upper limit value its
Application in chemical precipitation method dephosphorization process generallys use the mode of aeration for the Fe in water2+It is oxidized to Fe3+, to improve it
Sedimentation function.
Aluminium salt dephosphorization mechanism and process are as follows: Metal aluminum salt mainly passes through Al3+Indissoluble salt is formed with phosphate ion, together
When Al3+Hydrolysis generates Al (OH)2+、Al(OH)2 +、AlO2 -Equal mononuclear complexes, further hit against condensation and form polynuclear complex,
Its specific surface area with higher and positive charge, phosphor-removing effect are good.Aluminium salt chemical precipitation method goes the convenient pH value of dephosphorization to be
5.0~8.0, the sediment of generation is mainly AlPO4With Al (OH)3, wherein Al (OH)3Can also have to phosphate ion in water
Stronger suction-operated.
Calcium salt dephosphorization mechanism and process are as follows: calcium salt is to make Ca by the feeding lime into blowdown water2+With phosphate ion
Reaction generates di Ca-deposit, to remove the phosphate in waste water.During dephosphorization is gone in calcium salt chemical precipitation,
The pH of waste water is affected to phosphorus precipitating removal effect, and pH value is higher, and the effect of dephosphorization is better, when pH value of waste water is 8.0,
Calcium carbonate CaCO3Formation can obviously inhibit di Ca-deposit generation, phosphor-removing effect is poor, and when pH value be 9.0
When, this inhibiting effect can weaken.Therefore, for the phosphorus of water outlet keeps higher removal rate, it usually needs add large quantities of lime
PH value of waste water is set to be adjusted to high value (10.0~11.0), this causes chemical consumption amount big, and costly, produces simultaneously
Mud amount increases, so chemical precipitation method dephosphorization is general less using the method for adding calcium salt.
In summary various chemical precipitation methods have been shown a degree of in terms of pointedly removing phosphate
Treatment effect, but since chemical precipitation method control condition is more, by pH, temperature and adding of agent type, ratio, concentration etc.
The restriction of factor is obvious, therefore effluent quality is also relatively difficult to control, especially for the larger amount of low concentration phosphoric acid of boiler system
Salt blowdown water process, chemical precipitation method processing, which is used alone, not only largely influences the recycled fiber quality of processing water outlet, simultaneously also
A large amount of chemical sludge can be generated, subsequent treatment cost is increased.
In order to realize the high-quality recycling of boiler blowdown water and comply with the zero emission requirement of industry, enterprise, for boiler
The phosphate treated of sewerage, it is necessary to using combination water treatment technology, complete the high-quality recycling to boiler blowdown water
Meanwhile the outlet for even stopping boiler blowdown water being reduced, realize the purpose of industry, industry energy conservation emission reduction.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide based on ion exchange and change
The boiler blowdown water recovery processing technique for learning precipitating recycles the high-quality of boiler blowdown water being realized using ion exchange technique
While, it is acted on using the coagulation of the traditional chemical precipitation method, flocculating setting, adds a small amount of coagulation, flocculation aid, make the useless of high concentration
Liquid or regenerated liquid, which are realized, to be separated by solid-liquid separation, and is completed phosphatic removal in boiler blowdown water, is realized the zero-emission of boiler blowdown water.
The purpose of the present invention can be achieved through the following technical solutions:
Boiler blowdown water recovery processing technique based on ion exchange and chemical precipitation, the technique the following steps are included:
(1) high-efficiency fiber secondary filter: in order to ensure ion exchange resin is not contaminated, it is therefore desirable to boiler blowdown water
It is filtered, to remove possible iron oxide and other a small amount of suspended matters, the intoxicating phenomenon of resin caused by avoiding because of it.First by pot
Boiler blowdown water in dirt removing cooling tank is filtered by high-efficiency fiber filter, makes the haze reduction for filtering after-purification sewerage
To less than 1NTU, SDI value are less than 3；
(2) ion exchange resin exchanges: filtered purification sewerage is delivered to ion-exchanger by fresh water pump, and anion is handed over
Ion-exchange reactions occurs for the anion for changing resin and purifying in sewerage, goes ion-exchanger water outlet phosphate completely
It removes, enters boiler original water water tank by the water outlet that anion exchange resin exchanges, use regeneration after anion exchange resin saturation
Agent is regenerated and is backwashed to restore the function of exchange of anion exchange resin；
(3) chemical precipitation: the regeneration liquid waste and backwash waste liquid of ion-exchanger are mixed using coagulant, flocculant
Solidifying, flocculation sedimentation processing, supernatant fluid reuse to boiler desalination water pretreatment system or enters circulation.
Further, in step (1), boiler blowdown water passes through the filtering layer of high-efficiency fiber filter from bottom to up.At this point, living
Dynamic orifice plate regulating device moves upwards, and after fiber is pressurized, density of the filtering layer along water flowing direction is gradually increased, and corresponding filtering layer is empty
Gap diameter and gap are gradually reduced, and are realized to the in-depth filtration of sewerage, and iron oxide that may be present in sewerage, glue are removed
The substances such as body, suspended matter obtain boiler blowdown water after purification.
Further, ion-exchanger described in step (2) is highly basic chlorine type ion-exchanger.
Further, anion exchange resin described in step (2) is 201 × 7 strong-base anion-exchange resin of chlorine type.
Further, anion exchange beads degree described in step (2) is 0.3~1.2mm.
Further, in step (2), since regeneration liquid waste water is smaller, sewage collecting buffer pool is designed to regeneration
Or backwash waste liquid is collected, and then in suitable pH range, carries out chemical settling removal, place using coagulant, flocculant
The water outlet of reason supernatant is used as boiler original water or circulation supplement water, a small amount of sludge centralized processing in bottom.Wherein, preferably
PH range be 7.0~9.5.
Further, regenerative agent described in step (2) is sodium chloride solution, the chlorination that preferred mass score is 5~10%
Sodium solution.
Further, coagulant described in step (3) be selected from aluminium polychloride (PAC), polyaluminum ferric chloride (PAFC) or
One or more of bodied ferric sulfate (PFS).
Further, flocculant described in step (3) is anionic polyacrylamide (PAM), closer, anion
Polyacrylamide (PAM) is solid powder, and molecular weight is 800~12,000,000.
Further, the allocation ratio of coagulant described in step (3) is the aqueous solution of mass fraction 5~10%, is used
Concentration is 30~100mg/l in every liter of waste water.
Further, flocculant allocation ratio described in step (3) is the aqueous solution of mass fraction 0.5~1.5%, is used
Concentration is 1~10mg/l in every liter of waste water.
Compared with prior art, the present invention has the following advantages and beneficial effects:
(1) ion exchange resin has the ability of inorganic ions in good removal sewerage, can completely remove sewerage
Middle inorganic phosphate and other possible Inorganic Ions make the boiler feedwater of ion-exchanger water outlet recycling high-quality,
It is fed directly to boiler sweet-water tank, greatly improves the utilization rate of boiler blowdown water, while reducing the pre- place of boiler feedwater
Reason expense reduces operating cost.
(2) using highly basic Chioro-anion exchange resin as the ion-exchanger of filler, not only exchange capacity with higher,
And its technique is influenced smaller by the pH of sewerage, temperature, and ion-exchanger effluent quality stay in grade may be implemented to general
The high efficiente callback of boiler blowdown water utilizes, and saves a large amount of high-quality water resources.
(3) a small amount of regeneration liquid waste and backwash waste liquid generated by ion-exchange process, is passing through a small amount of coagulant, wadding
After solidifying agent processing, the mud amount of generation is considerably less, while the high value for realizing boiler blow-off waste water recycles, greatly
Sludge treatment expense is saved, processing cost is reduced.
(4) treatment process reaction rate of the present invention is fast, and the time is short, and entire technique occupied area is very small, adapts to various
The recovery processing of the boiler blow-off waste water of pressure rating, present treatment simple process, easy operation control have good economy and society
It can benefit.
Detailed description of the invention
Fig. 1 is the process flow chart of the one of embodiment of the present invention.
In figure, 1 is boiler blow-off cooling tank, and 2 be high-efficiency fiber filter, and 3 be delivery pump, and 4 be ion-exchanger, and 5 are
Online phosphorus monitors table, and 6 be without phosphorus water storage tank out, and 7 is remove DW system demineralized water system, and 8 be sewage collecting buffer pool, and 10 be boiler blow-off
Water, 20 be without phosphorus water outlet, and 30 are discharged to regenerate or backwashing waste liquid, 40 for supernatant, and 50 be sludge.
Specific embodiment
Boiler blowdown water recovery processing technique based on ion exchange and chemical precipitation, as shown in Figure 1, the technique include with
Lower step:
(1) high-efficiency fiber secondary filter: in order to ensure ion exchange resin is not contaminated, it is therefore desirable to boiler blowdown water
It is filtered, to remove possible iron oxide and other a small amount of suspended matters, the intoxicating phenomenon of resin caused by avoiding because of it.First by pot
Boiler blowdown water 10 in dirt removing cooling tank 1, which is sent by delivery pump 3 to high-efficiency fiber filter 2, to be filtered, and makes to filter after-purification
The haze reduction to less than 1NTU of sewerage, SDI value is less than 3；
(2) ion exchange resin exchanges: filtered purification sewerage is delivered to ion-exchanger 4 by fresh water pump, and ion is handed over
Ion-exchange reactions occurs for the anion in anion exchange resin and purification sewerage in parallel operation 4, goes out ion-exchanger
Water phosphate is completely removed, and the online phosphorus of the outlet of ion-exchanger 4 setting monitoring phosphorus content monitors table 5, by anion
The without phosphorus water outlet 20 of exchanger resin exchange enters without phosphorus water storage tank 6 out, then is pumped to DW system demineralized water system 7 by conveying.Yin from
It is regenerated and is backwashed to restore the function of exchange of anion exchange resin using regenerative agent after sub-exchange resin saturation；
(3) since regeneration liquid waste water is smaller, 8 pairs of sewage collecting buffer pool regeneration or recoil chemical precipitation: are designed
Waste liquid 30 is washed to be collected, then 7.0~9.5 pH range, using coagulant, flocculant to the regenerated of ion-exchanger
Liquid and backwash waste liquid carry out coagulation, flocculation sedimentation processing, and supernatant water outlet 40 is supplemented as boiler original water or circulation
Water uses, and a small amount of sludge 50 in bottom focuses on.
Preferred embodiment in above embodiment, in step (1), boiler blowdown water passes through high-efficiency fiber filter from bottom to up
Filtering layer.At this point, removable orifice plate regulating device moves upwards, after fiber is pressurized, filtering layer along water flowing direction density gradually
It increases, corresponding filtering layer aperture diameter and gap are gradually reduced, and realize the in-depth filtration to sewerage, and removing may deposit in sewerage
The substances such as iron oxide, colloid, suspended matter, obtain boiler blowdown water after purification.
Preferred embodiment in above embodiment, ion-exchanger described in step (2) are highly basic chlorine type ion-exchanger.
Preferred embodiment in above embodiment, anion exchange resin described in step (2) are 201 × 7 strong basicity of chlorine type
Anion exchange resin.
Preferred embodiment in above embodiment, anion exchange beads degree described in step (2) are 0.3~1.2mm.
Preferred embodiment in above embodiment, regenerative agent described in step (2) are sodium chloride solution, and preferred mass score is
5~10% sodium chloride solution.
Preferred embodiment in above embodiment, coagulant described in step (3) are selected from aluminium polychloride (PAC), polymerization chlorine
Change one or more of ferro-aluminum (PAFC) or bodied ferric sulfate (PFS).
Preferred embodiment in above embodiment, flocculant described in step (3) are anionic polyacrylamide (PAM), more
Further, anionic polyacrylamide (PAM) is solid powder, and molecular weight is 800~12,000,000.
Preferred embodiment in above embodiment, the allocation ratio of coagulant described in step (3) are mass fraction 5~10%
Aqueous solution, the use of concentration is 30~100mg/l in every liter of waste water.
Preferred embodiment in above embodiment, flocculant allocation ratio described in step (3) be mass fraction 0.5~
1.5% aqueous solution is 1~10mg/l in every liter of waste water using concentration.
The present invention is described in detail combined with specific embodiments below.
Embodiment 1
For handling Sichuan Gas Purification Factory boiler blow-off cooling tank sewerage, implementation steps are made further
Explanation.
(1): being about 30m by total water amount of blowdown3The boiler blowdown water of/h is delivered to high-efficiency fiber filtering from blowdown cooling tank
It is filtered in device, Fiber Diameter Φ 1200mm, the high 300mm of filter layer.Filter power output 25m3/ h, effluent quality turbidity are less than
1NTU, SDI < 3.0.
(2): filtering water outlet in step (1) being pumped into chlorine type ion-exchanger by water purification, a diameter of Φ
1000mm, the high 800mm of resin layer, separate unit design rating 30m3/ h, flow velocity 15m/h.Water outlet PO is controlled by online phosphorus table4 3-<
0.10mg/l；It is as follows that ion-exchanger passes in and out water quality situation: water inlet: turbidity 0.20NTU, pH9.11, conductivity 86us/cm,
PO4 3-8.81mg/l；Water outlet: turbidity 0.13NTU, pH7.13, conductivity 130us/cm, PO4 3-0.01mg/l.
(3): the ion-exchanger water outlet for the high-quality that step (2) is obtained is sent into the recycling of boiler original water water tank and is used.When
It is discharged phosphate anion and is more than or equal to 0.1mg/l, ion exchange resin reaches saturation, using using 10% sodium chloride solution again
It is raw, it is then backwashed, so that exchanger resin is replied regeneration function, and make regeneration liquid waste and the backwash of the acid group containing high concentration phosphorus
It is to be processed that waste liquid enters collecting pit.
(4): the regeneration liquid waste and backwash waste liquid that step (3) are generated carry out coagulation, flocculating setting processing: in stirring shape
Under state, coagulant polymeric aluminium chloride ferrum 50mg/l, stir about 3min are sequentially added into regeneration liquid waste and backwash collecting pit, so
After add 2.0mg/l anion PAM, fast reaction about 10 seconds, then static about 30min, isolated bed mud, supernatant fluid turbidity
It is then up to standard to send to boiler feedwater pretreatment system less than 3NTU.
Embodiment 2
For handling the large-scale paper mill RB boiler mixing sewerage in Hainan, specific implementation step is as follows:
(1): will about 140m3/ h blowdown cooling tank mixing blowdown water conveys accurate filter filtering, separate unit filter stream
Fast design rating is 60m3/ h, filter delivery turbidity are less than 1.0NTU, and SDI is less than 5.0.
(2): step (1) being filtered and is discharged, Chioro-anion exchange resin, a diameter of Φ are pumped by water purification
2500mm, the high 2200mm of resin layer, separate unit design rating 75m3/ h, flow velocity 25m/h.Water outlet PO is controlled by online phosphorus table4 3-<
0.10mg/l；It is as follows that ion-exchanger passes in and out water quality situation: water inlet: turbidity 0.15NTU, pH8.84, conductivity 89us/cm,
PO4 3-12.72mg/l；Water outlet: turbidity 0.03NTU, pH6.96, conductivity 121us/cm, PO4 3-0.02mg/l.
(3): the high-quality water outlet that step (2) is obtained is sent into boiler original water water tank and is used for DW system demineralized water system.Work as water outlet
Phosphate anion is more than or equal to 0.1mg/l, is regenerated using grade II desalted water plus 10% sodium chloride solution, and high-concentration phosphoric acid is contained
The regeneration liquid waste of root enters concentration collecting pit, at the same backwashing wastewater be also directly entered collecting pit collect it is to be processed.
(4): the regeneration liquid waste and backwash waste liquid that step (3) are generated carry out coagulation, flocculating setting processing.It is stirring
Under state, coagulant polymeric aluminium chloride ferrum 80mg/l is sequentially added into concentration collecting pit, then stir about 5min is added
3mg/l anionic polyacrylamide PAM, fast reaction about 10 seconds, then static about 30min, isolated bed mud, supernatant fluid turbidity
Less than 3NTU, sent after up to standard to boiler pretreatment system or circulation.
Embodiment 3
For handling Zhejiang petroleum chemical enterprise power boiler sewerage, implementation steps are as follows:
(1): will about 66m3/ h boiler blowdown water is sent into high-efficiency fiber filter filtering, separate unit filter flow rate design rating
For 45m3/ h, filter delivery turbidity are less than 1.0NTU, and SDI is less than 3.0.
(2): by step (1) filter be discharged, by water pump be sent into chlorine type anion exchanger, a diameter of Φ 1500mm,
The high 1000mm of resin layer, separate unit design rating 65m3/ h, flow velocity design 20m/h.Water outlet PO is controlled by online phosphorus table4 3-<
0.10mg/l；Ion-exchanger disengaging water quality situation is as follows, water inlet: turbidity 0.3NTU, pH9.18, conductivity 92us/cm, PO4 3-
10.5mg/l；Water outlet: turbidity 0.02NTU, pH7.81, conductivity 119us/cm, PO4 3-0.07mg/l。
(3): boiler original water water tank is sent into the ion-exchanger water outlet that step (2) obtains and enters DW system demineralized water system.When out
Water phosphate anion is greater than 0.1mg/l, i.e., ion-exchanger out of service, into ion regenerative system.It is configured using demineralized water
10% sodium chloride regenerated liquid carries out regeneration treatment, and ion-exchanger is made to restore regeneration function, the regenerated of the acid group containing high concentration phosphorus
Liquid and backwash waste liquid enter collecting pit.
(4): regeneration liquid waste and backwash liquid that step (3) generate are gradually added into coagulant polymeric sulphur under stirring
Sour iron 50mg/l, stir about 10min, then add 3mg/l anionic polyacrylamide PAM, and fast reaction about 10 seconds, then
Static about 20min isolates bed mud, and supernatant fluid turbidity is less than 3NTU, then up to standard to send to boiler pretreatment system or recirculated water
Supplement pipe network.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (3)
1. the boiler blowdown water recovery processing technique based on ion exchange and chemical precipitation, which is characterized in that the technique include with
Lower step:
(1) high-efficiency fiber secondary filter: boiler blowdown water is filtered by high-efficiency fiber filter, makes to filter after-purification sewerage
Haze reduction to less than 1NTU, SDI value is less than 3；
(2) ion exchange resin exchanges: filtered purification sewerage is delivered to ion-exchanger, exchanges by anion exchange resin
Water outlet enter boiler original water water tank, regenerated after anion exchange resin saturation using regenerative agent to restore anion exchange
The function of exchange of resin；
(3) chemical precipitation: using coagulant, flocculant to the regeneration liquid waste of ion-exchanger and backwash waste liquid carry out coagulation,
Flocculation sedimentation processing, supernatant fluid reuse to boiler desalination water pretreatment system or enter circulation；
Ion-exchanger described in step (2) is highly basic chlorine type ion-exchanger；
Anion exchange beads degree described in step (2) is 0.3~1.2mm；
Flocculant described in step (3) is anionic polyacrylamide；
The allocation ratio of coagulant described in step (3) is the aqueous solution of mass fraction 5~10%, the use of concentration is every liter of waste water
In 30~100mg/l；
Anion exchange resin described in step (2) is 201 × 7 strong-base anion-exchange resin of chlorine type；
Flocculant allocation ratio described in step (3) is the aqueous solution of mass fraction 0.5~1.5%, the use of concentration is every liter useless
1~10mg/l in water.
2. the boiler blowdown water recovery processing technique according to claim 1 based on ion exchange and chemical precipitation, special
Sign is that regenerative agent described in step (2) is sodium chloride solution.
3. the boiler blowdown water recovery processing technique according to claim 1 based on ion exchange and chemical precipitation, special
Sign is that coagulant described in step (3) is selected from one of aluminium polychloride, polyaluminum ferric chloride or bodied ferric sulfate or several
Kind.
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