CN109133440A - A kind of desulfurization wastewater zero-discharge treatment system and technique - Google Patents
A kind of desulfurization wastewater zero-discharge treatment system and technique Download PDFInfo
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- CN109133440A CN109133440A CN201710541318.4A CN201710541318A CN109133440A CN 109133440 A CN109133440 A CN 109133440A CN 201710541318 A CN201710541318 A CN 201710541318A CN 109133440 A CN109133440 A CN 109133440A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 40
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 28
- 230000023556 desulfurization Effects 0.000 title claims abstract description 28
- 208000028659 discharge Diseases 0.000 title claims abstract description 26
- 238000011282 treatment Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000012528 membrane Substances 0.000 claims abstract description 45
- 238000001728 nano-filtration Methods 0.000 claims abstract description 40
- 230000005611 electricity Effects 0.000 claims abstract description 27
- 150000003839 salts Chemical class 0.000 claims abstract description 18
- 150000002500 ions Chemical class 0.000 claims abstract description 16
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 34
- 239000002562 thickening agent Substances 0.000 claims description 28
- 239000002244 precipitate Substances 0.000 claims description 17
- 239000003014 ion exchange membrane Substances 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910001424 calcium ion Inorganic materials 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 4
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- -1 sulfate radical Chemical class 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 3
- 238000009295 crossflow filtration Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000000347 magnesium hydroxide Substances 0.000 claims description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 238000001471 micro-filtration Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of desulfurization wastewater zero-discharge treatment system and technique, waste water strengthens sofening treatment by tube microfiltration membrane and enters nanofiltration separation membrane completion monovalent ion and bivalent ions separation.According to dilute side and concentrated water side material properties, electricity consumption is driven ionic membrane and is further concentrated, and maximally reduces vapo(u)rization system treatment scale and fouling tendency.Evaporative crystallization section obtains crystal salt using MVR crystallizer, finally realizes the resource utilization of waste water and crystal salt, while saving investment, significantly reduces waste water operating cost, can really realize the zero-emission of waste water.
Description
Technical field
The present invention relates to a kind of desulfurization wastewater zero-discharge treatment system and techniques, belong to desulfurization wastewater processing technology field.
Background technique
In recent years, new " environmental law ", " General Office of the State Council is about the opinion for carrying out environmental pollution third party improvement ", " water
Prevention and cure of pollution action plan " etc. a series of law & policies it is successive appearance and implementation, water-saving and emission-reducing and recycling have become certainty
Selection.For domestic power source project based on thermal power generation, power plant's majority is distributed in water shortage zone, turns over water resource every year
Take, amount of pollutant discharge fees it is considerable.Carry out the research of thermal power plant's zero-discharge technology, improves water-use efficiency, reduces discharge of wastewater, both
National Accelerate Conservation-minded Society Construction requirement is responded, national environmental protection policy is met, while to economy of power plant benefit is promoted, guarantee can
Sustainable development has highly important directive function.Power industry desulfurization wastewater zero-discharge technology application is still within starting and spy
In the rope stage, the design and operating experience of Zero discharging system are insufficient, and in addition high processing cost is also important restraining factors.
Summary of the invention
It is an object of the invention to overcome the defect of the above-mentioned prior art, a kind of desulfurization wastewater zero-discharge treatment system is provided
And technique.The present invention divides salt, electricity to drive ionic membrane concentration, MVR evaporation, dry fluidisation using tubular membrane strenuous primary treatment, nanofiltration membrane
The technology of bed, realizes the resource utilization of waste water and crystal salt, while saving investment, significantly reduces waste water operation
Cost can really realize the zero-emission of waste water.
For this purpose, the present invention provides a kind of desulfurization wastewater zero-discharge treatment systems, including pass through the sequentially connected original of pipeline
Water tank, preformed precipitate case, the first reaction tank, the second reaction tank, thickener, tubular type film device, tubular membrane water producing tank, nanofiltration raw water
Case, nanofiltration device, electricity drive ion-exchange membrane facility, MVR vaporising device and fluidized bed drying device；The concentration of the tubular type film device
Liquid is connect by return line with thickener, and the concentrated water outlet that the electricity drives ion-exchange membrane facility is connect with MVR evaporator inlet.
Desulfurization wastewater zero-discharge treatment system provided by the invention first carries out preliminary softening to desulfurization wastewater and pre-processes,
Calcium, magnesium heavy metal ion and the suspended matter in waste water are tentatively eliminated, separation is then filtered using tubular membrane, macromolecular is cut
It stays substance to be back to thickener, reduces the hardness for producing water, the production water of tubular membrane is adjusted back by pH, carried out into nanofiltration device
Divide salt treatment, divalent ion major part envelope intercepts in concentrated water side, is back to preformed precipitate pond and reprocessed, and monovalent ion produces
Water side enters electricity and drives ion-exchange membrane facility progress concentration, and the concentrated water that electricity drives ionic membrane output is routed directly to MVR vaporising device.It should
Zero-discharge treatment system, good waste water treatment effect can completely remove the metal and suspended matter in water, and cold open type is followed between production water meets
Ring cooling water quality standard (GB 50050-2007), occupied area is small, and operational management is convenient.
Further, the pipeline between the raw water box and preformed precipitate pond is equipped with the first elevator pump；The preformed precipitate pond
There are the second elevator pump, the thickener to connect by circulating pump with tubular type film device on pipeline between the first reaction tank；Institute
It states tubular membrane production water and is pumped to nanofiltration raw water box through third promotion, nanofiltration raw water enters nanofiltration by booster pump and high-pressure pump and fills
It sets；The nanofiltration produces water and enters electricity drive ion-exchange membrane facility by the 4th elevator pump.
Preferably, the tubular membrane concentrated water is back to thickener by return line, the thickener by pipeline with
Plate and frame filter press connection.
Preferably, first reaction tank and the second reaction tank are equipped with self- poking arrangement and pH monitor.
Further, the tubular membrane produces water pH after adjusting back, into nanofiltration device.
As an improvement, the nanofiltration membrane can effectively retain divalent and highly charged ions, and most of monovalent ion can have
Effect penetrates, and sulfate radical, calcium ions and magnesium ions removal efficiency are stablized 98% or more.The production that nanofiltration membrane is further concentrated in ionic membrane is driven using electricity
Water, concentrated water TDS are up to 200000mg/L.Electricity drives ionic membrane concentrated water and is directly entered MVR vaporising device, obtains the crystallization of high added value
Salt.
The present invention also provides a kind of desulfurization wastewater Zero-discharge treating process, include the following steps:
Step 1: the desulfurization wastewater being collected into being transported in raw water box, the heavy of raw water box bottom is discharged after natural subsidence
Form sediment, waste water be promoted to preformed precipitate pond through the first elevator pump, calcium hydroxide is added and carries out preliminarily softened processing, formed calcium sulfate and
Magnesium hydrate precipitate.
Step 2: supernatant enters the first reaction tank through the second elevator pump, and sodium hydroxide and carbon are added into the first reaction tank
PH value in pond is adjusted to 10 ~ 12 by sour sodium, and magnesium hydroxide is precipitated completely, while the sodium carbonate being added will be in reaction solution
Calcium ion reacts to form precipitation of calcium carbonate；First reaction tank reacts bottom of pond portion connection with second, abundant by self- poking arrangement
After mixing, liquid flooding to thickener；
Step 3: the liquid in thickener produces water by circulating pump cross-flow filtration in tubular membrane, after filtering and collects in tubular membrane production
Water tank, it is 5 ~ 7 that acid adding, which adjusts back pH,；Concentrated water, to thickener, reaches certain concentration, by sludge by return line high-flow backflow
It is emitted into plate and frame filter press, filters effluent collection in the second reaction tank；
Step 4: the water that pH value is adjusted back in nanofiltration water producing tank is sent to nanofiltration raw water box through third elevator pump, finely tunes pH value about 6 or so,
Water enters nanofiltration through booster pump, high-pressure pump and divides salt device；Concentrated water containing most of divalent salts flow to preformed precipitate pond and is further processed,
Production water containing most of monovalent ion enters electricity drive ion-exchange membrane facility and is concentrated；
Step 5: water drives in electricity and carries out high magnification concentration in ion-exchange membrane facility, produce water can reuse up to standard, concentrated water TDS is up to
200000mg/L is directly entered MVR vaporising device, by separating drying, generates high added value crystal salt.
Preferably, the tubular membrane concentrated water is back to thickener by return line, the thickener by pipeline with
Plate and frame filter press connection.
Preferably, first reaction tank and the second reaction tank are equipped with self- poking arrangement and pH monitor.
Further, the tubular membrane produces water pH after adjusting back, into nanofiltration device.
As an improvement, the nanofiltration membrane can effectively retain divalent and highly charged ions, and most of monovalent ion can have
Effect penetrates, and sulfate radical, calcium ions and magnesium ions removal efficiency are stablized 98% or more.The production that nanofiltration membrane is further concentrated in ionic membrane is driven using electricity
Water, concentrated water TDS are up to 200000mg/L.Electricity drives ionic membrane concentrated water and is directly entered MVR vaporising device, obtains the crystallization of high added value
Salt.
Desulfurization wastewater zero-discharge treatment system of the present invention and technique, structure is simple, and process flow is shorter, convenient for operation
Maintenance, producing water water quality is preferable, and desulfurization wastewater is concentrated and is reduced, and resource re-uses, and reaches water saving target.
Detailed description of the invention
Fig. 1 is the flow diagram of desulfurization wastewater zero-discharge treatment system and technique provided by the invention.
Description of symbols: 1, raw water box；2, preformed precipitate pond；3, the first reaction tank；4, the second reaction tank；5, thickener；
6, tubular type film device；7, tubular membrane water producing tank；8, nanofiltration raw water box；9, nanofiltration device；10, electricity drives ion-exchange membrane facility；11,MVR
Vaporising device；12, fluidized bed drying device；13, plate and frame filter press；14, the first elevator pump；15, the second elevator pump；16, it recycles
Pump；17, third elevator pump；18, booster pump；19, high-pressure pump；20, concentrate recirculation pipeline.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated.
The embodiment of the present invention:
As shown in Fig. 1, a kind of desulfurization wastewater zero-discharge treatment system: including passing through the sequentially connected raw water box of pipeline, preliminary sedimentation
Shallow lake case, the first reaction tank, the second reaction tank, thickener, tubular type film device, tubular membrane water producing tank, nanofiltration raw water box, nanofiltration dress
It sets, electricity drives ion-exchange membrane facility, MVR vaporising device and fluidized bed drying device；The concentrate of the tubular type film device passes through back
Flow tube road is connect with thickener, and the concentrated water outlet that the electricity drives ion-exchange membrane facility is connect with MVR evaporator inlet.
The tubular membrane concentrated water is back to thickener by return line, and the thickener passes through pipeline and plate and frame filter press
Connection；
First reaction tank and the second reaction tank are equipped with self- poking arrangement and pH monitor；
The tubular membrane produces water pH after adjusting back, into nanofiltration device；
The nanofiltration membrane can effectively retain divalent and highly charged ions, and most of monovalent ion can be penetrated effectively, sulfate radical,
Calcium ions and magnesium ions removal efficiency is stablized 98% or more.The production water that nanofiltration membrane is further concentrated in ionic membrane is driven using electricity, concentrated water TDS is up to
200000mg/L.Electricity drives ionic membrane concentrated water and is directly entered MVR vaporising device, obtains the crystal salt of high added value.
A kind of desulfurization wastewater Zero-discharge treating process, comprising the following steps: the desulfurization wastewater being collected into first is transported to original
In water tank, the precipitating of raw water box bottom is discharged after natural subsidence, waste water is promoted to preformed precipitate pond through the first elevator pump, is added
Enter calcium hydroxide and carry out preliminarily softened processing, forms calcium sulfate and magnesium hydrate precipitate；Supernatant enters the through the second elevator pump
Sodium hydroxide and sodium carbonate are added into the first reaction tank, the pH value in slot is adjusted to 10 ~ 12, magnesium hydroxide obtains for one reaction tank
To complete precipitating, while the sodium carbonate being added reacts the calcium ion in reaction solution to form precipitation of calcium carbonate；First reaction tank with
Second reaction bottom of pond portion connection, after self- poking arrangement is sufficiently mixed, liquid flooding to thickener；Liquid in thickener
By circulating pump in tubular membrane cross-flow filtration, water is produced after filtering and is collected in tubular membrane water producing tank, it is 5 ~ 7 that acid adding, which adjusts back pH,；It is dense
Water reaches certain concentration by return line high-flow backflow to thickener, by mud discharging to plate and frame filter press, crosses drainage
It collects in the second reaction tank；The water that pH value is adjusted back in nanofiltration water producing tank is sent to nanofiltration raw water box through third elevator pump, finely tunes pH
Value about 6 or so, water enters nanofiltration through booster pump, high-pressure pump and divides salt device；Concentrated water containing most of divalent salts flow to preformed precipitate pond
It is further processed, the production water containing most of monovalent ion enters electricity drive ion-exchange membrane facility and is concentrated；Water drives ionic membrane dress in electricity
Set middle progress high magnification concentration, produce water can reuse up to standard, concentrated water TDS is up to 200000mg/L, is directly entered MVR evaporation dress
It sets, by separating drying, generates high added value crystal salt.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is to be all belonged to the scope of protection of the present invention with the same or similar design of the present invention.
Claims (9)
1. a kind of desulfurization wastewater zero-discharge treatment system and technique, it is characterised in that: including passing through the sequentially connected raw water of pipeline
Case (1), preformed precipitate case (2), the first reaction tank (3), the second reaction tank (4), thickener (5), tubular type film device (6), tubular membrane
Water producing tank (7), nanofiltration raw water box (8), nanofiltration device (9), electricity drive ion-exchange membrane facility (10), MVR vaporising device (11) and stream
Change bed drying device (12)；The concentrate of the tubular type film device (6) is connect by return line with thickener (5), the electricity
The concentrated water outlet for driving ion-exchange membrane facility (10) is connect with MVR evaporator (11) entrance.
2. a kind of desulfurization wastewater zero-discharge treatment system and technique according to claim 1, it is characterised in that: the raw water box
(1) pipeline between preformed precipitate pond (2) is equipped with the first elevator pump (14)；Between the preformed precipitate pond and the first reaction tank
There are the second elevator pump, the thickener (5) to connect by circulating pump with tubular type film device (6) on pipeline；The tubular membrane produces water
It send through third elevator pump (17) to nanofiltration raw water box (8), nanofiltration raw water enters nanofiltration by booster pump (18) and high-pressure pump (19)
Device (9)；The nanofiltration produces water and enters electricity drive ion-exchange membrane facility (10).
3. a kind of desulfurization wastewater zero-discharge treatment system and technique as described in claim 1, it is characterised in that: the tubular membrane is dense
Water is back to thickener (5) by return line (20), and the thickener (5) is connect by pipeline with plate and frame filter press (13).
4. a kind of desulfurization wastewater zero-discharge treatment system and technique as described in claim 1, it is characterised in that: first reaction
Pond (3) and the second reaction tank (4) are equipped with self- poking arrangement and pH monitor.
5. a kind of desulfurization wastewater zero-discharge treatment system and technique as described in claim 1, it is characterised in that: the tubular membrane produces
Water pH is after adjusting back, into nanofiltration device.
6. a kind of desulfurization wastewater zero-discharge treatment system and technique, characterized by the following steps:
Step 1: the desulfurization wastewater being collected into being transported in raw water box, the heavy of raw water box bottom is discharged after natural subsidence
Form sediment, waste water be promoted to preformed precipitate pond through the first elevator pump, calcium hydroxide is added and carries out preliminarily softened processing, formed calcium sulfate and
Magnesium hydrate precipitate；
Step 2: supernatant enters the first reaction tank through the second elevator pump, and sodium hydroxide and carbonic acid are added into the first reaction tank
PH value in slot is adjusted to 10 ~ 12 by sodium, and magnesium hydroxide is precipitated completely, while the sodium carbonate being added is by the calcium in reaction solution
Ionic reaction forms precipitation of calcium carbonate；First reaction tank reacts bottom of pond portion connection with second, sufficiently mixed by self- poking arrangement
After conjunction, liquid flooding to thickener；
Step 3: the liquid in thickener produces water by circulating pump cross-flow filtration in tubular membrane, after filtering and collects in tubular membrane production
Water tank, it is 5 ~ 7 that acid adding, which adjusts back pH,；Concentrated water, to thickener, reaches certain concentration, by sludge by return line high-flow backflow
It is emitted into plate and frame filter press, filtered water collection is in thickener；
Step 4: the water that pH value is adjusted back in nanofiltration water producing tank is sent to nanofiltration raw water box through third elevator pump, finely tunes pH value about 6 or so,
Water enters nanofiltration through booster pump, high-pressure pump and divides salt device；Concentrated water containing most of divalent salts flow to preformed precipitate pond and is further processed,
Production water containing most of monovalent ion enters electricity drive ion-exchange membrane facility and is concentrated；
Step 5: water drives in electricity and carries out high magnification concentration in ion-exchange membrane facility, produce water can reuse up to standard, concentrated water TDS is up to
200000mg/L is directly entered MVR vaporising device, by separating drying, generates high added value crystal salt.
7. a kind of desulfurization wastewater zero-discharge treatment system and technique according to claim 6, it is characterised in that: the nanofiltration membrane
Divalent and highly charged ions can be effectively retained, and most of monovalent ion can be penetrated effectively, sulfate radical, calcium ions and magnesium ions removal efficiency
Stablize 98% or more.
8. a kind of desulfurization wastewater zero-discharge treatment system and technique according to claim 6, it is characterised in that: expelled using electricity
The production water and concentrated water of nanofiltration membrane is further concentrated in sub- film, and concentrated water TDS is up to 200000mg/L.
9. a kind of desulfurization wastewater zero-discharge treatment system and technique according to claim 6, it is characterised in that: electricity drives ionic membrane
Concentrated water is directly entered MVR vaporising device, obtains the crystal salt of high added value.
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