CN105906149A - Chlor-alkali plant strong brine zero-discharge treatment system and treatment method - Google Patents
Chlor-alkali plant strong brine zero-discharge treatment system and treatment method Download PDFInfo
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- 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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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- 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
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- 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
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- 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
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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Abstract
The invention belongs to the field of wastewater treatment and provides a chlor-alkali plant strong brine zero-discharge treatment system. The system comprises a first-stage concentration system, a second-stage concentration system and a third-stage concentration system. The invention further discloses a chlor-alkali plant strong brine zero-discharge treatment method. The three-stage concentration treatment technology is selected and adopted. First-stage concentration treatment includes chemical softening, A/O-MBR membrane bioreactor and anti-fouling reverse osmosis, and the recycling rate of the system can be 66% or above. TDS in concentrated water is concentrated to about 30 g/l through the second-stage concentration system, and TDS in concentrated water is concentrated to about 100 g/l through the third-stage concentration system. According to the whole reaction system, only 1-2% heavy salt water enters an evaporation and crystallization system, and the recycling rate of the system can be 99% or above.
Description
Technical field
The invention belongs to field of waste water treatment, be specifically related to the process side of the waste water that a kind of chlor-alkali plant is discharged
Method and processing system.
Background technology
Last decade, polrvinyl chloride (PVC) demand sharply increases, and within 2014, domestic PVC production capacity reaches
To 23,000,000 tons, account for world's PVC production capacity 60.5%.Domestic PVC manufacturing enterprise many employings carbide,
Needing to consume substantial amounts of freshwater resources, production unit PVC needs 25 tons of water, produces by 1,000,000 tons of PVC
Ability calculates, and needs 25,000,000 tons of water year, and after general waste water treatment process processes, waste water returns
Yield is only 60%, year waste discharge amount be up to 10,000,000 tons.And most of PVC manufacturing enterprises are all
Being positioned at western coal producing region, the most just area of water scarcity, by shipwreck, energy consumption is high, it is big to pollute
Enterprise development is seriously constrained etc. problem.Along with the raising with water cost, blowdown controls the increasing of dynamics,
Effective technology for treating industrial waste water becomes the important means of water-saving and emission-reducing.
The most a lot of PVC enterprises are circulated by full factory water of making rational planning for, and classification processes each workshop section waste water,
The water such as materialization, biochemistry is used to process means so that effluent part is back to water quality requirement the highest
Production unit.In order to improve the recycling rate of waterused of waste water, reverse osmosis membrane technology becomes waste water recycling
Important means, has had the most in the industrial production and has been widely applied.
Although reverse osmosis membrane technology can lifting waste water reclamation rate, but its reuse ability only has 70%-80%,
The strong brine still having the complicated component of about 20%-30% produces, and this effluent part is due to containing higher
Hardness, heavy metal ion, silicon, multiple salt and Organic substance, intractability is big, and processing cost is high,
Most enterprises are that simple process is the most directly discharged, serious pollution of water environment；Also some enterprise is to reverse osmosis
Strong brine carries out secondary counter osmosis concentration or direct evaporation crystallization thoroughly, but both modes are invested, transported
Row cost is high, and the process of the strong brine that the former produces again is more difficult, and the latter crystallizes the mixed salt of generation
Need to process by danger is useless, treatment effect is the most undesirable, according to current environment protection emission requirement, dense water enter one
Step comprehensive utilization is extremely the most urgent.
Summary of the invention
The weak point existed for this area, the purpose of the present invention is to propose to a kind of chlor-alkali plant strong brine
The processing system of zero-emission.
Second object of the present invention is the processing method proposing a kind of chlor-alkali plant strong brine zero-emission.
The technical scheme realizing above-mentioned purpose of the present invention is:
The processing system of a kind of chlor-alkali plant strong brine zero-emission, including primary concentration system, secondary concentration
System and three grades of concentration systems；
Described primary concentration system includes dense water regulating reservoir and chemical tendering pond, describedization being sequentially connected with
Learn the connection of softening pond and have chemical tendering clear water reserviors and sludge dewatering unit；Described chemical tendering clear water reserviors are even
Being connected to catalytic ozonation pond, the outlet pipeline in described catalytic ozonation pond connects A/O-MBR film
Bioreactor, the product mouth of a river of A/O-MBR membrane bioreactor connects two-stage nitration reverse osmosis units,
The outlet pipeline of described two-stage nitration reverse osmosis units connects product Water circulation pond；The reverse osmosis concentrated water lines of two-stage nitration
Enter the reverse osmosis concentrated pond of two-stage nitration, subsequently into secondary concentration system；
Described secondary concentration system includes the resin pliable cell nano-filtration unit being sequentially connected with, described nanofiltration
The water producing pipe road of unit is sequentially connected with high pressure reverse osmosis units, the first high-pressure flat plate film unit, and described
The outlet of one high-pressure flat plate film unit connects described product Water circulation pond, the first high-pressure flat plate by pipeline
The dense water lines of film unit enters the first dense pond of high-pressure flat plate film, concentrates system subsequently into described three grades
System；The dense water lines of described nano-filtration unit is sequentially connected with filter and the second high-pressure flat plate film unit, institute
The outlet stating the second high-pressure flat plate film unit connects described product Water circulation pond by pipeline；Second high pressure
The dense water lines of Flat Membrane unit enters the second dense pond of high-pressure flat plate film, subsequently into described three grades dense
Compression system；
Described three grades of concentration systems include the first Membrane Materials unit and the second Membrane Materials unit, described first
The dense water lines of high-pressure flat plate film unit connects the first Membrane Materials unit, described first Membrane Materials unit
Water producing pipe road connects described product Water circulation pond；The dense water lines of described second high-pressure flat plate film unit connects
Second Membrane Materials unit, described second Membrane Materials unit of cells water producing pipe road connects described product Water circulation
Pond.
Wherein, in described primary concentration system, the product mouth of a river of A/O-MBR membrane bioreactor connects
Having MBR to produce pond, MBR produces pond has the first cartridge filter by pipeline and low-lift pump connection,
Connecting described two-stage nitration reverse osmosis units through high-pressure pump again, described low pressure pump lift is 10～100m,
Described high pressure pump lift is 100～1600m.
Wherein, in described secondary concentration system, the outlet pipeline of resin pliable cell enters resin and softens
Clear water reserviors, resin softens clear water reserviors has the second cartridge filter, then warp by pipeline and low-lift pump connection
Cross high-pressure pump and connect described nano-filtration unit.
Further, in described secondary concentration system, the water producing pipe road of described nano-filtration unit enters nanofiltration
Producing pond, being connected by pipeline and low-lift pump has the 3rd cartridge filter, then connects institute through high-pressure pump
State high pressure reverse osmosis units；Described low pressure pump lift is 10～100m, described high pressure pump lift
It is 100～1600m.
The water producing pipe road of described high pressure reverse osmosis units connects produces Water circulation pond, and dense water lines connects described
First high-pressure flat plate film unit, is provided with bitter film or desalinization in described high pressure reverse osmosis units
Film.
Bitter film or sea water desalination membrane are commercial, and Tao Shi, Hydranautics, toray, GE etc. look forward to
Industry all has production.
The dense water lines of described nano-filtration unit enters the dense water pot of nanofiltration, and being connected by pipeline and low-lift pump is had
Mechanical filter, then connect the 5th cartridge filter through pipeline and low-lift pump；5th cartridge filter
The second high-pressure flat plate film unit is connected through pipeline and high-pressure pump.
Because high-pressure flat plate film device, high pressure reverse osmosis equipment influent side pressure are high, so can not be with often
The pump of tens meters of lifts of rule.Wherein, described low pressure pump lift is 10～100m, described high-pressure pump
Lift be 100～1600m.
Wherein, in described three grades of concentration systems, the dense water lines of described first Membrane Materials unit enters
The brine system of Caustic soda factory；
The dense water lines of described second Membrane Materials unit connects evaporation crystallization equipment, and evaporation water lines connects
Described product Water circulation pond.
Further, described processing system also includes sludge treating system, bottom described chemical tendering pond
Connect described sludge treating system；Described sludge treating system includes device for dehydrating sladge waste.
The processing method of a kind of chlor-alkali plant strong brine zero-emission, uses processing system of the present invention,
Comprise the following steps:
Primary concentration processes: add into Calx, soda, coagulant, flocculation aid to chlor-alkali plant strong brine
In one or more, make the mud-water separation of strong brine, the water outlet on upper strata add ozone and hydrogen peroxide,
Being then passed through A/O-MBR film biological unit, the process of two-stage nitration reverse osmosis units, product water enters and produces
Water circulation pond, dense water carries out secondary concentration process；
Secondary concentration processes: dense water softens through macropore cation resin or chelate resin, nanofiltration membrane,
Nanofiltration water outlet is again through high pressure reverse osmosis membrane processing, and water outlet enters produces Water circulation pond, and dense water carries out three grades
Concentration；The dense water of nanofiltration processes through high-pressure flat plate film, and product water enters and produces Water circulation pond, and dense water enters
Three grades of concentration of row；
Three grades of concentration: the dense water that high salt reverse osmosis membrane processing produces is evaporated concentrating, product water
Entering and produce Water circulation pond, dense water enters Caustic soda factory brine system to carry out producing reuse；
High-pressure flat plate film processes the dense water produced and is evaporated concentrating, and product water enters and produces Water circulation pond,
Dense water is evaporated crystallization, and evaporation is produced water and entered product Water circulation pond, the solid salt then conduct that crystallization generates
The dry salt of solid waste is disposed.
The chlor-alkali plant strong brine that the present invention is targeted, produces, for carbide, the waste water that polrvinyl chloride produces,
Its pollutant component is complicated, the COD in waterCr100～500mg/L, BOD 20～300mg/L, SS
50-500mg/L, possibly together with other impurity, including phosphide 0～80mg/L, sulfide
100～300mg/L.
Further, the materialized mud mixing of chemical tendering pond discharge flows into sludge treating system, then
It is delivered to sludge dewatering system dehydration by sludge pump, after dehydration, after mud cake, delivers to cement production device conduct
Cement producting material realizes harmless treatment.
The pressing filtering liquid of sludge dewatering and sludge dewatering equipment flushing water are back to dense water regulating reservoir and do further
Process.
Wherein, during described primary concentration processes, add into Calx to chlor-alkali plant strong brine
100～300mg/L, soda 200～400mg/L, coagulant 2～50mg/L, flocculation aid 0～10mg/L,
Described coagulant is bodied ferric sulfate, aluminum sulfate, ferric chloride, aluminium polychlorid (PAC), polymerization
Aluminum sulfate (PAS), poly-ferric chloride (PFC), poly-silicic acid iron sulfate (PFSS), poly-phosphorus iron chloride
(PPFC) one or more, in poly-phosphorus aluminum chloride (PPAC), ferric-polysilicate (PSF), described in help solidifying
Agent is selected from polyacrylamide, activated silicic acid (or claiming activated silica), osseocolla, sodium alginate
Plant or multiple.
During primary concentration processes, ozonator is utilized to put into ozone to chlor-alkali plant strong brine
10～100mg/L, the hydrogen peroxide of employing technical grade 10-15%, input amount 2～100mg/L.Ozone is sent out
Raw device can process parameter control flow.
The beneficial effects of the present invention is:
The present invention selects to use three grades of concentration techniques:
Primary concentration processes: chemical tendering+A/O-MBR membrane bioreactor+anti-pollution reverse-osmosis,
The response rate of feasible system more than 66%, is concentrated into about 30g/l by the TDS in dense water, will
Influent COD is down to below 100mg/l；
Secondary concentration processes: antipollution nanofiltration+high pressure reverse osmosis+high-pressure flat plate film, feasible system
The response rate of 90%, and by point salt of nanofiltration system, nanofiltration is produced Water Sproading rate and is up to more than 85%,
TDS in dense water is concentrated into about 30g/l by secondary concentration system；
Three grades of concentration: nanofiltration produces water by being directly entered after secondary concentration technique and membrane distillation technique
Caustic soda factory saline reclaiming system；The dense water of nanofiltration is by entering Membrane Materials and evaporation knot after secondary concentration technique
Crystallographic system is united, and by Membrane Materials system, the TDS in dense water can be concentrated into about 200g/l, a whole set of anti-
The haline water answering system to only have 1%～2% enters evaporation and crystallization system, feasible system more than 99%
The response rate；
System discharge chemical sludge and biological sludge are transported to manufacture of cement system after being dehydrated by dewatering system
System is as raw material harmless treatment.
Accompanying drawing explanation
Fig. 1 is the technological process of the processing system of a kind of chlor-alkali plant strong brine zero-emission that the present invention proposes
Figure.
In figure: 1-dense water regulating reservoir；2-chemical tendering pond；3-device for dehydrating sladge waste；4-chemical tendering
Clear water reserviors；5-catalytic ozonation pond；6-A/O-MBR membrane bioreactor；7-MBR produces pond；
8-the first cartridge filter；9-two-stage nitration reverse osmosis units；The reverse osmosis concentrated pond of 10-two-stage nitration；11-resin
Pliable cell；12-resin softens clear water reserviors；13-the second cartridge filter；14-NF film unit；15-
Is produced from pond in nanofiltration；16-the 3rd cartridge filter；17-high pressure reverse osmosis units；18-high pressure is reverse osmosis concentrated
Water pot；19-the 4th cartridge filter；20-the first high-pressure flat plate film unit；21-the first high-pressure flat plate film
Dense pond；22-the first Membrane Materials unit；23-Caustic soda factory brine system；The dense water pot of 24-nanofiltration；25-
Mechanical filter；26-filter produces water pot；27-the 5th cartridge filter；28-the second high-pressure flat plate film
Unit；The dense pond of 29-the second high-pressure flat plate film；30-the second Membrane Materials unit；The dense water pot of 31-Membrane Materials；
32-crystallizing evaporator；33-produces Water circulation pond；
Letter P represents pump, wherein: P1-pump a；P2-sludge pump；P3-pump b；P4-low-lift pump a；
P5-high-pressure pump a；P6-pump c；P7-low-lift pump b；P8-NF high-pressure pump b；P9-low-lift pump c；P10-
High-pressure pump c；P11-low-lift pump d；P12-high-pressure pump d；P13-pump d；P14-pump e；P15-low-lift pump
e；P16-high-pressure pump e；P17-pump f；P18-pump g.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention to the present invention is done and is retouched the most in detail
State.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
Embodiment 1:
See Fig. 1, the processing system of a kind of chlor-alkali plant strong brine zero-emission, including primary concentration system,
Secondary concentration system and three grades of concentration systems；
Primary concentration system includes dense water regulating reservoir 1 and chemical tendering pond 2, describedization being sequentially connected with
Learn the connection of softening pond 2 and have chemical tendering clear water reserviors 4 and device for dehydrating sladge waste 3；Described chemical tendering is clear
Pond 4 connects catalytic ozonation pond 5, and the outlet pipeline in described catalytic ozonation pond 5 connects
A/O-MBR membrane bioreactor 6, the product mouth of a river of A/O-MBR membrane bioreactor 6 connects to be had
MBR produces pond 7, and MBR produces pond 7 has the first cartridge filter by pipeline and low-lift pump connection,
Connecting two-stage nitration reverse osmosis units 9 through high-pressure pump again, the outlet pipeline of described two-stage nitration reverse osmosis units is even
It is connected to produce Water circulation pond 33；The reverse osmosis concentrated water lines of two-stage nitration enters the reverse osmosis concentrated pond of two-stage nitration 10, so
Rear entrance secondary concentration system；
Wherein low pressure pump lift is 40m, and described high pressure pump lift is 160m.Secondary concentration system
System includes the resin pliable cell 11 and NF film unit 14 (nano-filtration unit) being sequentially connected with, and resin is soft
The outlet pipeline changing unit enters resin softening clear water reserviors 12, and resin softens clear water reserviors 12 and passes through pipeline
Connect with low-lift pump P7 and have the second cartridge filter 13, then connect nano-filtration unit through high-pressure pump P8.
The water producing pipe road of described nano-filtration unit enters nanofiltration and produces pond 15, by pipeline and low-lift pump P9
Connect and have the 3rd cartridge filter 16, then connect high pressure reverse osmosis units 17 through high-pressure pump P10；
The water producing pipe road of described high pressure reverse osmosis units connects 33, and dense water lines connects the first high-pressure flat plate film
Unit 20, is provided with high pressure reverse osmosis membrane (Tao Shi SW30-4040) in this unit.
The outlet of the first high-pressure flat plate film unit 20 connects described product Water circulation pond 33 by pipeline,
The dense water lines of the first high-pressure flat plate film unit 20 enters the first dense pond of high-pressure flat plate film 21, then
Enter described three grades of concentration systems；
The dense water lines of described nano-filtration unit enters the dense water pot of nanofiltration 24, by pipeline and low-lift pump P14
Connect and have mechanical filter 25, then connect the 5th cartridge filter 27 through pipeline and low-lift pump P15；
5th cartridge filter connects the second high-pressure flat plate film unit 28 through pipeline and high-pressure pump P16, the
The outlet of two high-pressure flat plate film units is connected to produce Water circulation pond 33 by pipeline；Second high-voltage flat
The dense water lines of plate film unit 28 enters the second dense pond of high-pressure flat plate film 29, dense subsequently into three grades
Compression system；
Three grades of concentration systems include the first Membrane Materials unit 22 and the second Membrane Materials unit 30, described
The dense water lines of one high-pressure flat plate film unit connects the first Membrane Materials unit 22, the first Membrane Materials unit
The water producing pipe road of 22 connects produces Water circulation pond 33；The dense water lines of the second high-pressure flat plate film unit 28 is even
Connecing the second Membrane Materials unit 30, the water producing pipe road of the second Membrane Materials unit connects produces Water circulation pond 33.
Wherein, the dense water lines of the first Membrane Materials unit 22 enters the brine system of Caustic soda factory；
The dense water lines of described second Membrane Materials unit connects crystallizing evaporator 32, and evaporation water lines is even
Connect described product Water circulation pond 33.
Present treatment system also includes sludge treating system, connects described mud bottom chemical tendering pond 2
Processing system；Described sludge treating system includes device for dehydrating sladge waste 3.In the present embodiment, mud takes off
Wetting system is pressure filter.
Using the system of the present embodiment, for the strong brine of chlor-alkali plant, its index is CODCr
200mg/L, BOD 50mg/L, SS 300mg/L, phosphide 20mg/L, sulfide 30mg/L,
TDS 9000.Processing method is as follows:
Primary concentration processes:
Strong brine in dense water regulating reservoir 1 is lifted into chemical tendering pond 2 through pump, Calx, soda
Dosage is respectively 210mg/L and 350mg/L, then put into 10mg/L bodied ferric sulfate and
The PAM (polyacrylamide) of 1.5mg/L, removes most of hardness, basicity and the suspension in waste water
State material.The mud that chemical tendering pond 2 produces is driven into sludge dewatering system 3 by sludge pump P2.
Chemical tendering pond 2 water outlet enters chemical tendering clear water reserviors 4, pumps into ozone with pump P3 the most again
In catalysis oxidation pond 5, added the ozone of 50mg/L and the industry of concentration 10% by ozonator
Grade hydrogen peroxide 30mg/L, is aoxidized by catalysis, removes the partial organic substances in water, it is provided that waste water can
Biochemical.Catalytic ozonation water outlet enters A/O-MBR film unit 6, in further degradation water
After COD, total nitrogen, and the material such as separating most float, colloid, antibacterial, MBR water outlet is entered
Enter MBR and produce pond 7.Cartridge filter is risen to the most again, by high-pressure pump by low-lift pump P4
P5 enters two-stage nitration reverse osmosis units 9, removes deionization, float, soluble solid etc., and product water enters
Entering to produce Water circulation pond 33, two-stage nitration reverse osmosis concentrated water enters the reverse osmosis concentrated pond of two-stage nitration 10, through one-level
Concentration, can be concentrated into 30g/l by the TDS in dense water.
Wherein, the materialized mud mixing of chemical tendering pond 2 discharge flows into sludge treating system 3, then
Being delivered to sludge dewatering system 3 by sludge pump P2, after dehydration, mud cake delivers to cement production device conduct
Cement producting material realizes harmless treatment.The pressing filtering liquid of sludge dewatering returns with sludge dewatering equipment flushing water
It flow to dense water regulating reservoir 1 be further processed.
Secondary concentration processes
Water in the reverse osmosis concentrated pond of two-stage nitration 10 is lifted in resin pliable cell 11 by pump P6
(resin employing chelate resin), at this to metal cations such as the calcium in two-stage nitration reverse osmosis concentrated water, magnesium
Carrying out resin softening, water outlet enters resin and softens clear water reserviors 12, then through nanofiltration (NF) low-lift pump
P7 is promoted to cartridge filter and enters NF film unit 14 under the effect of NF high-pressure pump P8.Warp
After crossing NF membrane unit 14 process, strong brine is efficiently separated into two parts: with sodium chloride (NaCl)
Water is produced in nanofiltration for main component, and with Na2SO4, NaCl be the dense water of nanofiltration of main component, absolutely
Most COD is trapped in dense water, it is achieved thereby that the preliminary salt separation target of strong brine, here,
Secondary concentration desalinating process is divided into two branch roads；
Wherein a branch road is: nanofiltration is produced water and entered nanofiltration product pond 15, is promoted by low-lift pump P9
To cartridge filter, rear by high-pressure pump P10 entrance high pressure reverse osmosis units 17, it is achieved further
Concentrating, product water enters and produces reuse tank 33, and dense water enters the reverse osmosis concentrated water pot of high pressure 18, and high pressure is anti-
Permeate the water in dense water pot 18 to first pass through low-lift pump P11 and be promoted to cartridge filter, then pass through high pressure
Pump P12 delivers to the first high-pressure flat plate film unit 20, concentration further to concentrated solution, and product water enters
Producing Water circulation pond 33, dense water enters the first dense pond of high-pressure flat plate film 21；
Another branch road is: the dense water of nanofiltration enters the dense water pot of nanofiltration 24, is promoted to machinery through pump P14
Filter 25 (mechanical filter uses quartz filter, filter pressure 0.6MPa), passes through filtrate
Retain, the effect such as net is caught, adsorb, bridge formation, remove the most of hydrophobicity suspended material in waste water,
The mechanical damage that protection subsequent film system is not caused by impurity.Filter produces water and enters filter product
Water pot 26, then be promoted to the 5th cartridge filter through low-lift pump P15, after by high-pressure pump P16 to
Two high-pressure flat plate film units 28, concentration further to concentrated solution, product water enters and produces Water circulation pond 33,
Dense water enters the second dense pond of high-pressure flat plate film 29, can be by dense water through secondary concentration system
TDS is concentrated into 100g/l.
This secondary concentration processes nanofiltration product Water Sproading rate and reaches 87%.
Three grades of concentration
Dense water in the first dense pond of high-pressure flat plate film 21 is sent by pumping to the first Membrane Materials unit 22,
Being evaporated concentrating, product water enters and produces Water circulation pond 33, and dense water enters Caustic soda factory brine system 23
Carry out producing reuse, the TDS in dense water can be concentrated into 200g/l by Membrane Materials system.
Water in the second dense pond of high-pressure flat plate film 29 delivers to the second Membrane Materials unit by pump P17
30, it is evaporated concentrating, the TDS in dense water can be concentrated into by the second Membrane Materials unit 30
About 200g/l, product water enters and produces Water circulation pond 33, and dense water enters the dense water pot of Membrane Materials 31, then
Deliver to crystallizing evaporator 32 through pump gP18 and carry out last concentration together, produce water entrance and produce Water circulation pond
33, the solid salt that crystallization generates then is disposed as the dry salt of solid waste.A whole set of response system only has
The haline water of 1% enters evaporation and crystallization system, it is achieved that the response rate of system 99%.
Embodiment 2
In the system that the present embodiment uses, Hydranautics SW1-4040 is set in high pressure reverse osmosis units
Sea water desalination membrane.Device for dehydrating sladge waste is folded spiral shell dewaterer.Mechanical filter 25 uses shallow-layer sand mistake
Filter, filter pressure 0.3MPa.
The strong brine index of the chlor-alkali plant processed is CODCr 150mg/L、BOD 30mg/L、
SS100mg/L, phosphide 20mg/L, sulfide 15mg/L, TDS 10000.Processing method is such as
Under:
Primary concentration processes:
Strong brine in dense water regulating reservoir 1 is lifted into chemical tendering pond 2 through pump, Calx, soda
Dosage is respectively 220mg/L and 320mg/L, then puts into the aluminium polychlorid (PAC) of 12mg/L
With the PAM (polyacrylamide) of 1.0mg/L, remove the most of hardness in waste water, basicity and hang
Floading condition material.The mud that chemical tendering pond 2 produces is driven into sludge dewatering system by sludge pump P2
3。
Chemical tendering pond 2 water outlet enters chemical tendering clear water reserviors 4, pumps into ozone with pump P3 the most again
In catalysis oxidation pond 5, add the ozone of 40mg/L and the technical grade pair of 12% by ozonator
The hydrogen peroxide of oxygen water 30mg/L, is aoxidized by catalysis, removes the partial organic substances in water, it is provided that useless
Water biodegradability.Catalytic ozonation water outlet enters A/O-MBR film unit 6, further degradation water
After middle COD, total nitrogen, and the material such as separating most float, colloid, antibacterial, MBR water outlet
Enter MBR and produce pond 7.Cartridge filter is risen to the most again, by high pressure by low-lift pump P4
Pump P5 enters two-stage nitration reverse osmosis units 9, removes deionization, float, soluble solid etc., product
Water enters and produces Water circulation pond 33, and two-stage nitration reverse osmosis concentrated water enters the reverse osmosis concentrated pond of two-stage nitration 10, passes through
Primary concentration processes, and the TDS in dense water can be concentrated into 32g/l.
Wherein, the materialized mud mixing of chemical tendering pond 2 discharge flows into sludge treating system 3, then
Being delivered to sludge dewatering system 3 by sludge pump P2, after dehydration, mud cake delivers to cement production device conduct
Cement producting material realizes harmless treatment.The pressing filtering liquid of sludge dewatering returns with sludge dewatering equipment flushing water
It flow to dense water regulating reservoir 1 be further processed.
Other are arranged and operation is with embodiment 1.
In the present embodiment, secondary concentration processes nanofiltration product Water Sproading rate and reaches 85%.By the second Membrane Materials
TDS in dense water can be concentrated into 220g/l by unit 30.A whole set of response system only has the high salt of 2%
Water enters evaporation and crystallization system, the response rate of feasible system 98%.
Embodiment 3
The strong brine index of the chlor-alkali plant that the present embodiment processes is CODCr 180mg/L、BOD
35mg/L, SS 100mg/L, phosphide 12mg/L, sulfide 8mg/L, TDS 8500.Place
Reason method is as follows:
Primary concentration processes:
Strong brine in dense water regulating reservoir 1 is lifted into chemical tendering pond 2 through pump, Calx, soda
Dosage is respectively 180mg/L and 280mg/L, then put into 12mg/L polyaluminium sulfate and
The PAM (polyacrylamide) of 1.0mg/L, removes most of hardness, basicity and the suspension in waste water
State material.The mud that chemical tendering pond 2 produces is driven into sludge dewatering system 3 by sludge pump P2.
Chemical tendering pond 2 water outlet enters chemical tendering clear water reserviors 4, pumps into ozone with pump P3 the most again
In catalysis oxidation pond 5, ozonator adds the ozone of 40mg/L and the industrial hydrogen peroxide of 10%
The hydrogen peroxide of 40mg/L, is aoxidized by catalysis, removes the partial organic substances in water, it is provided that waste water can
Biochemical.Catalytic ozonation water outlet enters A/O-MBR film unit 6, in further degradation water
After COD, total nitrogen, and the material such as separating most float, colloid, antibacterial, MBR water outlet is entered
Enter MBR and produce pond 7.Cartridge filter is risen to the most again, by high-pressure pump by low-lift pump P4
P5 enters two-stage nitration reverse osmosis units 9, removes deionization, float, soluble solid etc., and product water enters
Entering to produce Water circulation pond 33, two-stage nitration reverse osmosis concentrated water enters the reverse osmosis concentrated pond of two-stage nitration 10, through one-level
Concentration, can be concentrated into 28g/l by the TDS in dense water.
Wherein, the materialized mud mixing of chemical tendering pond 2 discharge flows into sludge treating system 3, then
Being delivered to sludge dewatering system 3 by sludge pump P2, after dehydration, mud cake delivers to cement production device conduct
Cement producting material realizes harmless treatment.The pressing filtering liquid of sludge dewatering returns with sludge dewatering equipment flushing water
It flow to dense water regulating reservoir 1 be further processed.
Other are arranged and operation is with embodiment 1.
In the present embodiment, secondary concentration processes nanofiltration product Water Sproading rate and reaches 85%.By the second Membrane Materials
TDS in dense water can be concentrated into 220g/l by unit 30.A whole set of response system only has the high salt of 2%
Water enters evaporation and crystallization system, the response rate of feasible system 98%.
Above embodiment is only to be described the preferred embodiment of the present invention, not to this
Bright scope is defined, on the premise of designing spirit without departing from the present invention, and this area ordinary skill
Various modification that technical scheme is made by technical staff and improvement, all should fall into the present invention's
In the protection domain that claims determine.
Claims (10)
1. the processing system of a chlor-alkali plant strong brine zero-emission, it is characterised in that include
Level concentration systems, secondary concentration system and three grades of concentration systems；
Described primary concentration system includes dense water regulating reservoir and chemical tendering pond, the institute being sequentially connected with
State the connection of chemical tendering pond and have chemical tendering clear water reserviors；The connection of described chemical tendering clear water reserviors has smelly
Oxygen catalysis oxidation pond, it is raw that the outlet pipeline in described catalytic ozonation pond connects A/O-MBR film
Thing reactor, the product mouth of a river of A/O-MBR membrane bioreactor connects two-stage nitration reverse osmosis units,
The outlet pipeline of described two-stage nitration reverse osmosis units connects product Water circulation pond；Two-stage nitration reverse osmosis concentrated water
Pipeline enters the reverse osmosis concentrated pond of two-stage nitration, subsequently into secondary concentration system；
Described secondary concentration system includes resin pliable cell and the nano-filtration unit being sequentially connected with, institute
The water producing pipe road stating nano-filtration unit is sequentially connected with high pressure reverse osmosis units, the first high-pressure flat plate film list
Unit, the outlet of described first high-pressure flat plate film unit connects described product Water circulation by pipeline
Pond, the dense water lines of the first high-pressure flat plate film unit enters the first dense pond of high-pressure flat plate film, so
The described three grades of concentration systems of rear entrance；The dense water lines of described nano-filtration unit is sequentially connected with filter
With the second high-pressure flat plate film unit, the outlet of described second high-pressure flat plate film unit passes through pipeline
Connect described product Water circulation pond；The dense water lines of the second high-pressure flat plate film unit enters the second high pressure
The dense pond of Flat Membrane, subsequently into described three grades of concentration systems；
Described three grades of concentration systems include the first Membrane Materials unit and the second Membrane Materials unit, described
The dense water lines of the first high-pressure flat plate film unit connects the first Membrane Materials unit, and described first film steams
The water producing pipe road evaporating unit connects described product Water circulation pond；Described second high-pressure flat plate film unit
Dense water lines connects the second Membrane Materials unit, and described second Membrane Materials unit water producing pipe road connects institute
State product Water circulation pond.
Processing system the most according to claim 1, it is characterised in that described one-level is dense
In compression system, the product mouth of a river of A/O-MBR membrane bioreactor connects has MBR to produce pond,
MBR produces pond has the first cartridge filter by pipeline and low-lift pump connection, then through high pressure
Pump connects described two-stage nitration reverse osmosis units, and described low pressure pump lift is 10～100m, described
High pressure pump lift is 100～1600m.
Processing system the most according to claim 1, it is characterised in that described two grades dense
In compression system, the outlet pipeline of resin pliable cell enters resin and softens clear water reserviors, and resin softens
Clear water reserviors are connected by pipeline and low-lift pump the second cartridge filter, then connects through high-pressure pump
Described nano-filtration unit.
4. according to the arbitrary described processing system of claims 1 to 3, it is characterised in that described
In secondary concentration system, the water producing pipe road of described nano-filtration unit enters nanofiltration and produces pond, by pipe
Road and low-lift pump connect the 3rd cartridge filter, then connects described high pressure reverse osmosis through high-pressure pump
Unit thoroughly；
The water producing pipe road of described high pressure reverse osmosis units connects described product Water circulation pond, dense water lines
Connect described first high-pressure flat plate film unit, in described high pressure reverse osmosis units, be provided with bitter
Film or sea water desalination membrane；
The dense water lines of described nano-filtration unit enters the dense water pot of nanofiltration, is connected by pipeline and low-lift pump
It is connected to mechanical filter, then connects the 5th cartridge filter through pipeline and low-lift pump；5th protects
Peace filter connects the second high-pressure flat plate film unit through pipeline and high-pressure pump；
Described low pressure pump lift is 10～100m, and described high pressure pump lift is
100～1600m.
5. according to the arbitrary described processing system of claims 1 to 3, it is characterised in that described
In three grades of concentration systems, the dense water lines of described first Membrane Materials unit enters the salt of Caustic soda factory
Water system；The dense water lines of described second Membrane Materials unit connects evaporation crystallization equipment, evaporates water
Pipeline connects described product Water circulation pond.
6. according to the arbitrary described processing system of claims 1 to 3, it is characterised in that described
Processing system also includes sludge treating system, connects at described mud bottom described chemical tendering pond
Reason system；Described sludge treating system includes device for dehydrating sladge waste.
7. a processing method for chlor-alkali plant strong brine zero-emission, employing claim 1～6
Processing system described in one, it is characterised in that comprise the following steps:
Primary concentration processes: adds into Calx, soda, coagulant to chlor-alkali plant strong brine, helps
One or more in solidifying agent, make the mud-water separation of strong brine, add ozone in the water outlet on upper strata
With hydrogen peroxide, it is then passed through A/O-MBR film biological unit, the process of two-stage nitration reverse osmosis units,
Product water enters and produces Water circulation pond, and dense water carries out secondary concentration process；
Secondary concentration processes: dense water softens through resin, nanofiltration membrane, and nanofiltration water outlet is passed through again
High pressure reverse osmosis membrane processing, water outlet enters produces Water circulation pond, and dense water carries out three grades of concentration；
The dense water of nanofiltration processes through high-pressure flat plate film, and product water enters and produces Water circulation pond, and dense water carries out three grades
Concentration, described resin is macropore cation resin or chelate resin；
Three grades of concentration: the dense water that high pressure reverse osmosis membrane processing produces is evaporated concentrating, and produces
Product water enters and produces Water circulation pond, and dense water enters Caustic soda factory brine system to carry out producing reuse；
High-pressure flat plate film processes the dense water produced and is evaporated concentrating, and product water enters and produces Water circulation
Pond, dense water is evaporated crystallization, and evaporation is produced water and entered product Water circulation pond, the solid that crystallization generates
Salt is then disposed as the dry salt of solid waste.
Processing method the most according to claim 7, it is characterised in that chemical tendering pond
The materialized mud mixing of discharge flows into sludge treating system, is then delivered to mud by sludge pump and takes off
Wetting system is dehydrated, and delivers to cement production device and realize as cement producting material after dehydration after mud cake
Harmless treatment；The pressing filtering liquid of sludge dewatering and sludge dewatering equipment flushing water are back to the regulation of dense water
Pond is further processed.
Processing method the most according to claim 7, it is characterised in that described one-level is dense
During contracting processes, add into Calx 100～300mg/L, soda to chlor-alkali plant strong brine
200～400mg/L, coagulant 2～50mg/L, flocculation aid 0～10mg/L, described coagulant is
Bodied ferric sulfate, aluminum sulfate, ferric chloride, aluminium polychlorid, polyaluminium sulfate, polymerization chlorine
Change the one in ferrum, poly-silicic acid iron sulfate, poly-phosphorus iron chloride, poly-phosphorus aluminum chloride, ferric-polysilicate
Or multiple, described flocculation aid is in polyacrylamide, activated silicic acid, osseocolla, sodium alginate
One or more.
10. according to the processing method described in claim 7 or 8, it is characterised in that described one
In level concentration, put into ozone 10～100mg/L and hydrogen peroxide to chlor-alkali plant strong brine
2～100mg/L, described ozone ozonator produces, and described hydrogen peroxide employing concentration is
The industrial grade hydrogen peroxide of 10-15%.
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