CN105906149B - A kind of processing system and processing method of the zero-emission of chlor-alkali plant strong brine - Google Patents
A kind of processing system and processing method of the zero-emission of chlor-alkali plant strong brine Download PDFInfo
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Abstract
The invention belongs to field of waste water treatment, propose a kind of processing system of chlor-alkali plant strong brine zero-emission, including primary concentration system, secondary concentration system and three-level concentration systems.The present invention also proposes a kind of processing method of chlor-alkali plant strong brine zero-emission.Present invention selection uses three-level concentration technique, primary concentration processing includes chemical tendering+A/O MBR membrane bioreactors+anti-pollution reverse-osmosis, the rate of recovery of 66% or more feasible system, TDS in concentrated water is concentrated into 30g/l or so by secondary concentration system, and TDS in concentrated water is concentrated into 100g/l or so by three-level concentration systems.The haline water that a whole set of reaction system only has 1%~2% enter evaporation and crystallization system, it can be achieved that 99% or more system the rate of recovery.
Description
Technical field
The invention belongs to field of waste water treatment, and in particular to a kind of processing method and processing system of the waste water of chlor-alkali plant discharge
System.
Background technology
Last decade, polyvinyl chloride (PVC) demand sharply increase, and country's PVC production capacities reach 23,000,000 tons within 2014, account for about
World's PVC production capacities 60.5%.Domestic PVC manufacturing enterprises mostly use carbide, need to consume a large amount of freshwater resources, production unit
PVC needs 25 tons of water, is calculated by 1,000,000 tons of PVC production capacity, 25,000,000 tons of water is needed year, by general waste water treatment process
After processing, Sewage treatment rate is only 60%, year waste discharge amount be up to 10,000,000 tons.And most of PVC manufacturing enterprises all positions
In western coal producing region, also the exactly area of water scarcity, enterprise is seriously constrained with the problems such as shipwreck, high energy consumption, big pollution
Industry develops.With the raising with water cost, the increasing of blowdown control dynamics, effective technology for treating industrial waste water becomes water-saving and subtracts
The important means of row.
Initially many PVC enterprises are recycled by full factory's water of making rational planning for, and classification handles each workshop section's waste water, using materialization, life
The water process means such as change so that effluent part is able to be back to the production unit not high to water quality requirement.In order to improve waste water
Recycling rate of waterused, reverse osmosis membrane technology become the important means of waste water recycling, have in the industrial production be widely applied at present.
Although reverse osmosis membrane technology can lifting waste water reclamation rate, its reuse ability only has 70%-80%, still there is 20%-
The strong brine of 30% or so complicated component generates, and the effluent part is due to containing higher hardness, heavy metal ion, silicon, more
Kind salt and organic matter, intractability is big, and processing cost is high, and most enterprises are simple process direct emission again, serious to pollute
Water environment；Also some enterprises carry out secondary reverse osmosis concentration or direct evaporative crystallization, but both sides to reverse osmosis concentrated brine
Formula investment, operating cost are high, and the processing for the strong brine that the former generates again is more difficult, and the latter crystallizes the mixed salt generated need to be by danger
Useless processing, treatment effect is undesirable, is required according to current environment protection emission, and the further comprehensive utilization of concentrated water is extremely urgent.
Invention content
For shortcoming existing for this field, the purpose of the present invention is to propose to a kind of places of chlor-alkali plant strong brine zero-emission
Reason system.
Second object of the present invention is to propose a kind of processing method of chlor-alkali plant strong brine zero-emission.
Realize that the technical solution of above-mentioned purpose of the present invention is：
A kind of processing system of chlor-alkali plant strong brine zero-emission, including primary concentration system, secondary concentration system and three-level
Concentration systems；
The primary concentration system includes concentrated water regulating reservoir connected in sequence and chemical tendering pond, and the chemical tendering pond connects
It is connected to chemical tendering clear water reserviors and sludge dewatering unit；The chemical tendering clear water reserviors are connected with catalytic ozonation pond, described
The outlet pipeline in catalytic ozonation pond connects A/O-MBR membrane bioreactors, and the production mouth of a river of A/O-MBR membrane bioreactors connects
Two sections of reverse osmosis units are connected to, the outlet pipeline of two sections of reverse osmosis units is connected with production water reuse tank；Two sections reverse osmosis concentrated
Water lines enter two sections of reverse osmosis concentrated ponds, subsequently into secondary concentration system；
The secondary concentration system includes resin pliable cell nano-filtration unit connected in sequence, the production water of the nano-filtration unit
Pipeline is sequentially connected with high pressure reverse osmosis units, the first high-pressure flat plate film unit, the water outlet of the first high-pressure flat plate film unit
By producing water reuse tank described in piping connection, the concentrated water pipeline of the first high-pressure flat plate film unit enters the first high-pressure flat plate film concentrated water
Pond, subsequently into the three-level concentration systems；The concentrated water pipeline of the nano-filtration unit is sequentially connected with filter and the second high-voltage flat
Plate film unit, the water outlet of the second high-pressure flat plate film unit is by producing water reuse tank described in piping connection；Second high-voltage flat
The concentrated water pipeline of plate film unit enters the second high-pressure flat plate film concentrated water pond, subsequently into the three-level concentration systems；
The three-level concentration systems include the first membrane distillation unit and the second membrane distillation unit, the first high-pressure flat plate film
The water producing pipe road of concentrated water piping connection the first membrane distillation unit of unit, the first membrane distillation unit connects the production water reuse
Pond；Concentrated water piping connection the second membrane distillation unit of the second high-pressure flat plate film unit, the second membrane distillation unit of cells
Water producing pipe road connects the production water reuse tank.
Wherein, in the primary concentration system, the production mouth of a river of A/O-MBR membrane bioreactors is connected with MBR productions pond,
MBR productions pond is connected with the first cartridge filter by pipeline and low-lift pump, reverse osmosis using described two sections of high-pressure pump connection
The lift of unit, the low-lift pump is 10~100m, and the lift of the high-pressure pump is 100~1600m.
Wherein, in the secondary concentration system, the outlet pipeline of resin pliable cell enters resin softening clear water reserviors, resin
Softening clear water reserviors are connected with the second cartridge filter by pipeline and low-lift pump, and the nano-filtration unit is connected using high-pressure pump.
Further, in the secondary concentration system, the water producing pipe road of the nano-filtration unit enters nanofiltration production pond, passes through
Pipeline and low-lift pump are connected with third cartridge filter, and the high pressure reverse osmosis units are connected using high-pressure pump；The low pressure
The lift of pump is 10~100m, and the lift of the high-pressure pump is 100~1600m.
The water producing pipe road of the high pressure reverse osmosis units, which connects, produces water reuse tank, the first high-voltage flat described in concentrated water piping connection
Plate film unit is provided with bitter film or sea water desalination membrane in the high pressure reverse osmosis units.
Bitter film or sea water desalination membrane are purchased in market, and there are production in the enterprises such as Tao Shi, Hydranautics, toray, GE.
The concentrated water pipeline of the nano-filtration unit enters nanofiltration concentrated water tank, and mechanical filter is connected with by pipeline and low-lift pump
Device connects the 5th cartridge filter with low-lift pump using pipeline；5th cartridge filter connects with high-pressure pump by pipeline
Two high-pressure flat plate film units.
Because high-pressure flat plate film device, high pressure reverse osmosis equipment are intake, lateral pressure is high, cannot be raised with conventional more than ten meters
The pump of journey.Wherein, the lift of the low-lift pump is 10~100m, and the lift of the high-pressure pump is 100~1600m.
Wherein, in the three-level concentration systems, the concentrated water pipeline of the first membrane distillation unit enters the brine of caustic soda factory
System；
The concentrated water piping connection evaporation crystallization equipment of the second membrane distillation unit, evaporation water lines connect the production water and return
Use pond.
Further, the processing system further includes sludge treating system, and chemical tendering bottom of pond portion connects the dirt
Mud treatment system；The sludge treating system includes device for dehydrating sladge waste.
A kind of processing method of chlor-alkali plant strong brine zero-emission, using processing system of the present invention, including following step
Suddenly：
Primary concentration processing：One kind in lime, soda ash, coagulant, flocculation aid or more is added to chlor-alkali plant strong brine
Kind, make the mud-water separation of strong brine, ozone and hydrogen peroxide added in the water outlet on upper layer, then pass through A/O-MBR films biological unit,
The processing of two sections of reverse osmosis units, product water enter production water reuse tank, and concentrated water carries out secondary concentration processing；
Secondary concentration processing：Concentrated water is discharged again through macropore cation resin or chelate resin softening, nanofiltration membrane, nanofiltration
By high pressure reverse osmosis membrane processing, water outlet enters production water reuse tank, and concentrated water carries out three-level concentration；Nanofiltration concentrated water is through high-voltage flat
Plate film process, product water enter production water reuse tank, and concentrated water carries out three-level concentration；
Three-level concentration：The concentrated water that reverse osmosis membrane processing with high salt generates is evaporated concentration, and product water enters production water and returns
With pond, concentrated water enters caustic soda factory brine system and carries out production reuse；
The concentrated water that high-pressure flat plate film process generates is evaporated concentration, and product water enters production water reuse tank, and concentrated water is steamed
Hair crystallization, evaporation production water enter production water reuse tank, and the solid salt for crystallizing generation is then used as the dry salt disposition of solid waste.
The targeted chlor-alkali plant strong brine of the present invention produces the waste water that polyvinyl chloride generates for carbide, pollutant at
Divide complexity, the COD in waterCr100~500mg/L, 20~300mg/L of BOD, SS50-500mg/L, also contain other impurities, packet
Include 0~80mg/L of phosphide, 100~300mg/L of sulfide.
Further, the materialized mud mixing of chemical tendering pond discharge flows into sludge treating system, then defeated by sludge pump
It send to sludge dewatering system and is dehydrated, sent to cement production device after mud cake after dehydration and realize innoxious place as cement producting material
Reason.
The pressing filtering liquid of sludge dewatering is back to concentrated water regulating reservoir with sludge dewatering equipment flushing water and is further processed.
Wherein, it in the primary concentration processing, is added to chlor-alkali plant strong brine into 100~300mg/L of lime, soda ash 200
~400mg/L, 2~50mg/L of coagulant, 0~10mg/L of flocculation aid, the coagulant are bodied ferric sulfate, aluminum sulfate, trichlorine
Change iron, aluminium polychloride (PAC), polyaluminium sulfate (PAS), poly-ferric chloride (PFC), poly-silicic acid iron sulfate (PFSS), poly- phosphorus
One or more in iron chloride (PPFC), poly- phosphorus aluminium chloride (PPAC), ferric-polysilicate (PSF), the flocculation aid is selected from poly- third
It is one or more in acrylamide, activated silicic acid (or activated silica), gelatine, sodium alginate.
In primary concentration processing, to chlor-alkali plant strong brine using 10~100mg/L of ozone generator input ozone, using work
The hydrogen peroxide of industry grade 10-15%, 2~100mg/L of input amount.Ozone generator can process parameter control flow.
The beneficial effects of the present invention are：
Present invention selection uses three-level concentration technique：
Primary concentration processing：Chemical tendering+A/O-MBR membrane bioreactors+anti-pollution reverse-osmosis is, it can be achieved that system 66%
TDS in concentrated water is concentrated into 30g/l or so, influent COD is down to 100mg/l or less by above rate of recovery；
Secondary concentration processing：Antipollution nanofiltration+high pressure is reverse osmosis+high-pressure flat plate film, it can be achieved that system 90% the rate of recovery,
And by the salt that divides of nanofiltration system, the nanofiltration production water rate of recovery is up to 85% or more, and secondary concentration system is dense by the TDS in concentrated water
It is reduced to 30g/l or so；
Three-level concentration：Nanofiltration produces water by being directly entered caustic soda factory brine after secondary concentration technique and membrane distillation technique
Reclaiming system；Nanofiltration concentrated water, can by membrane distillation system by entering membrane distillation and evaporation and crystallization system after secondary concentration technique
TDS in concentrated water is concentrated into 200g/l or so, the haline water that a whole set of reaction system only has 1%~2% enters evaporative crystallization system
System, it can be achieved that 99% or more system the rate of recovery；
System discharge chemical sludge and biological sludge are transported to cement production system after being dehydrated by dewatering system and are used as raw material
Harmless treatment.
Description of the drawings
Fig. 1 is a kind of process flow chart of the processing system of chlor-alkali plant strong brine zero-emission proposed by the present invention.
In figure：1- concentrated water regulating reservoirs；2- chemical tenderings pond；3- device for dehydrating sladge waste；4- chemical tendering clear water reserviors；5- ozone
Catalysis oxidation pond；6-A/O-MBR membrane bioreactors；7-MBR produces pond；The first cartridge filters of 8-；Bis- sections of reverse osmosis lists of 9-
Member；The bis- sections of reverse osmosis concentrated ponds 10-；11- resin pliable cells；12- resins soften clear water reserviors；The second cartridge filters of 13-；
14-NF film units；Is produced from pond in 15- nanofiltrations；16- third cartridge filters；17- high pressure reverse osmosis units；18- high pressures are reverse osmosis concentrated
Water pot；The 4th cartridge filters of 19-；20- the first high-pressure flat plate film units；21- the first high-pressure flat plate film concentrated waters pond；22- first
Membrane distillation unit；23- caustic soda factory brine system；24- nanofiltration concentrated water tanks；25- mechanical filters；26- filters produce water pot；27-
5th cartridge filter；28- the second high-pressure flat plate film units；29- the second high-pressure flat plate film concentrated waters pond；30- the second membrane distillation lists
Member；31- membrane distillation concentrated water tanks；32- crystallizing evaporators；33- produces water reuse tank；
Alphabetical P indicates pump, wherein：P1- pumps a；P2- sludge pumps；P3- pumps b；P4- low-lift pumps a；P5- high-pressure pumps a；P6- is pumped
c；P7- low-lift pumps b；P8-NF high-pressure pumps b；P9- low-lift pumps c；P10- high-pressure pumps c；P11- low-lift pumps d；P12- high-pressure pumps d；P13-
Pump d；P14- pumps e；P15- low-lift pumps e；P16- high-pressure pumps e；P17- pumps f；P18- pumps g.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Embodiment 1：
See Fig. 1, a kind of processing system of chlor-alkali plant strong brine zero-emission, including primary concentration system, secondary concentration system
With three-level concentration systems；
Primary concentration system includes concentrated water regulating reservoir 1 connected in sequence and chemical tendering pond 2, and the chemical tendering pond 2 connects
It is connected to chemical tendering clear water reserviors 4 and device for dehydrating sladge waste 3；The chemical tendering clear water reserviors 4 are connected with catalytic ozonation pond 5,
The outlet pipeline connection A/O-MBR membrane bioreactors 6 in the catalytic ozonation pond 5, A/O-MBR membrane bioreactors 6
The production mouth of a river is connected with MBR productions pond 7, and MBR productions pond 7 is connected with the first cartridge filter by pipeline and low-lift pump, using
High-pressure pump connects two sections of reverse osmosis units 9, and the outlet pipeline of two sections of reverse osmosis units is connected with production water reuse tank 33；Two sections
Reverse osmosis concentrated water lines enter two sections of reverse osmosis concentrated ponds 10, subsequently into secondary concentration system；
Wherein the lift of low-lift pump is 40m, and the lift of the high-pressure pump is 160m.Secondary concentration system includes being sequentially connected with
Resin pliable cell 11 and NF film units 14 (nano-filtration unit), the outlet pipeline of resin pliable cell enter resin softening clear water
Pond 12, resin softening clear water reserviors 12 are connected with the second cartridge filter 13 by pipeline and low-lift pump P7, using high-pressure pump P8
Connect nano-filtration unit.
The water producing pipe road of the nano-filtration unit enters nanofiltration production pond 15, and being connected with third by pipeline and low-lift pump P9 protects
Pacify filter 16, using high-pressure pump P10 connection high pressures reverse osmosis units 17；The water producing pipe road of the high pressure reverse osmosis units connects
Connect 33, the first high-pressure flat plate of concentrated water piping connection film unit 20 is provided with high pressure reverse osmosis membrane (Tao Shi SW30- in the unit
4040)。
The water outlet of first high-pressure flat plate film unit 20 is by producing water reuse tank 33, the first high-pressure flat plate described in piping connection
The concentrated water pipeline of film unit 20 enters the first high-pressure flat plate film concentrated water pond 21, subsequently into the three-level concentration systems；
The concentrated water pipeline of the nano-filtration unit enters nanofiltration concentrated water tank 24, and machinery is connected with by pipeline and low-lift pump P14
Filter 25 connects the 5th cartridge filter 27 using pipeline with low-lift pump P15；5th cartridge filter passes through pipeline and height
Press pump P16 the second high-pressure flat plates of connection film unit 28, the water outlet of the second high-pressure flat plate film unit is by piping connection in production water
Reuse tank 33；The concentrated water pipeline of second high-pressure flat plate film unit 28 enters the second high-pressure flat plate film concentrated water pond 29, subsequently into three
Grade concentration systems；
Three-level concentration systems include the first membrane distillation unit 22 and the second membrane distillation unit 30, the first high-pressure flat plate film
The first membrane distillation of concentrated water piping connection unit 22 of unit, the water producing pipe road connection production water reuse tank of the first membrane distillation unit 22
33；The second membrane distillation of concentrated water piping connection unit 30 of second high-pressure flat plate film unit 28, the water producing pipe of the second membrane distillation unit
Road connection production water reuse tank 33.
Wherein, the concentrated water pipeline of the first membrane distillation unit 22 enters the brine system of caustic soda factory；
The concentrated water piping connection crystallizing evaporator 32 of the second membrane distillation unit, evaporation water lines connect the production water and return
With pond 33.
Present treatment system further includes sludge treating system, and 2 bottom of chemical tendering pond connects the sludge treating system；It is described
Sludge treating system includes device for dehydrating sladge waste 3.In the present embodiment, device for dehydrating sladge waste is filter press.
Using the system of the present embodiment, for the strong brine of chlor-alkali plant, index CODCr200mg/L、BOD 50mg/L、
SS 300mg/L, phosphide 20mg/L, sulfide 30mg/L, TDS 9000.Processing method is as follows：
Primary concentration processing：
Strong brine in concentrated water regulating reservoir 1 is lifted into chemical tendering pond 2 through pump, lime, soda ash dosage be respectively
210mg/L and 350mg/L, then the bodied ferric sulfate of 10mg/L and the PAM (polyacrylamide) of 1.5mg/L are put into, remove waste water
In most of hardness, basicity and suspended state substance.The sludge that chemical tendering pond 2 generates is driven into sludge by sludge pump P2 and takes off
Water system 3.
The water outlet of chemical tendering pond 2 enters chemical tendering clear water reserviors 4, is then pumped into catalytic ozonation pond 5 with pump P3 again,
The ozone of 50mg/L is added by ozone generator to go by catalysis oxidation with the industrial grade hydrogen peroxide 30mg/L of concentration 10%
Partial organic substances in water removal, provide wastewater biodegradability.Catalytic ozonation water outlet enters A/O-MBR film units 6, further
COD, total nitrogen in degradation water, and after the substances such as separating most suspended matter, colloid, bacterium, MBR water outlets enter MBR and produce pond 7.
Then promoted again to cartridge filter by low-lift pump P4, enter two sections of reverse osmosis units 9 by high-pressure pump P5, go deionization,
Suspended matter, soluble solid etc., product water enter production water reuse tank 33, and two sections of reverse osmosis concentrated waters enter two sections of reverse osmosis concentrated ponds
10, it is handled by primary concentration, the TDS in concentrated water can be concentrated into 30g/l.
Wherein, the materialized mud mixing that chemical tendering pond 2 is discharged flows into sludge treating system 3, then defeated by sludge pump P2
It send to sludge dewatering system 3, mud cake send to cement production device and realizes harmless treatment as cement producting material after dehydration.It is dirty
The pressing filtering liquid of mud dehydration is back to concentrated water regulating reservoir 1 with sludge dewatering equipment flushing water and is further processed.
Secondary concentration processing
Water in two sections of reverse osmosis concentrated ponds 10 is lifted into resin pliable cell 11 that (resin uses chelating by pumping P6
Resin), resin softening is carried out to metal cations such as calcium, magnesium in two sections of reverse osmosis concentrated waters at this, water outlet enters resin and softens
Clear water reserviors 12 are promoted to cartridge filter using nanofiltration (NF) low-lift pump P7 and enter NF films under the action of NF high-pressure pump P8
Unit 14.After the processing of nanofiltration film unit 14, strong brine is efficiently separated into two parts：With sodium chloride (NaCl) be mainly at
Water is produced in the nanofiltration divided, and with Na2SO4, NaCl nanofiltration concentrated waters as main component, most COD are trapped in concentrated water, to
The preliminary salt separation target for realizing strong brine, here, secondary concentration desalinating process is divided into two branches；
Wherein a branch is：Nanofiltration production water enters nanofiltration production pond 15, and cartridge filter is promoted to by low-lift pump P9,
High pressure reverse osmosis units 17 are entered by high-pressure pump P10 afterwards, realize that further concentration, product water enter production reuse tank 33, concentrated water
Into the reverse osmosis concentrated water pot 18 of high pressure, the water in the reverse osmosis concentrated water pot of high pressure 18 first passes through low-lift pump P11 and is promoted to security personnel's filtering
Device, then given to the first high-pressure flat plate film unit 20 by high-pressure pump P12, concentrate is further concentrated, product water enters production water
Reuse tank 33, concentrated water enter the first high-pressure flat plate film concentrated water pond 21；
Another branch be：Nanofiltration concentrated water enters nanofiltration concentrated water tank 24, and (the machinery of mechanical filter 25 is promoted to through pumping P14
Filtering uses quartz filter, filter pressure 0.6MPa), the effects that being caught, adsorbed by the retention of filtrate, net, built bridge, removal
Most of hydrophobicity suspended material in waste water, protects follow-up membranous system not by the mechanical damage caused by impurity.Filter
Production water enters filter production water pot 26, then is promoted to the 5th cartridge filter through low-lift pump P15, after by high-pressure pump P16 to second
High-pressure flat plate film unit 28 further concentrates concentrate, and product water enters production water reuse tank 33, and concentrated water enters the second high-voltage flat
TDS in concentrated water can be concentrated into 100g/l by plate film concentrated water pond 29 by secondary concentration system.
This secondary concentration handles nanofiltration and produces the water rate of recovery up to 87%.
Three-level concentration
Concentrated water in first high-pressure flat plate film concentrated water pond 21 is sent by pumping to the first membrane distillation unit 22, is evaporated dense
Contracting, product water enter production water reuse tank 33, and concentrated water enters caustic soda factory brine system 23 and carries out production reuse, passes through membrane distillation system
TDS in concentrated water can be concentrated into 200g/l.
Water in second high-pressure flat plate film concentrated water pond 29 is sent by pumping P17 to the second membrane distillation unit 30, is evaporated dense
TDS in concentrated water can be concentrated into 200g/l or so by contracting by the second membrane distillation unit 30, and product water enters production water reuse tank
33, concentrated water enters membrane distillation concentrated water tank 31, then is sent to crystallizing evaporator 32 through pump gP18 and carry out last concentration together, production water entrance
Water reuse tank 33 is produced, the solid salt for crystallizing generation is then used as the dry salt disposition of solid waste.A whole set of reaction system only has 1% height
Brine enters evaporation and crystallization system, realizes the rate of recovery of system 99%.
Embodiment 2
In the system that the present embodiment uses, Hydranautics SW1-4040 sea water desalination membranes are set in high pressure reverse osmosis units.It is dirty
Mud dehydration equipment is folded spiral shell dewaterer.Mechanical filter 25 is filtered using shallow-layer sand, filter pressure 0.3MPa.
The strong brine index of the chlor-alkali plant of processing is CODCr150mg/L, BOD 30mg/L, SS100mg/L, phosphide
20mg/L, sulfide 15mg/L, TDS 10000.Processing method is as follows：
Primary concentration processing：
Strong brine in concentrated water regulating reservoir 1 is lifted into chemical tendering pond 2 through pump, lime, soda ash dosage be respectively
220mg/L and 320mg/L, then the aluminium polychloride (PAC) of 12mg/L and the PAM (polyacrylamide) of 1.0mg/L are put into, it removes
Most of hardness, basicity in waste water and suspended state substance.The sludge that chemical tendering pond 2 generates is driven into dirt by sludge pump P2
Mud dewatering system 3.
The water outlet of chemical tendering pond 2 enters chemical tendering clear water reserviors 4, is then pumped into catalytic ozonation pond 5 with pump P3 again,
The hydrogen peroxide that the ozone of 40mg/L and 12% industrial grade hydrogen peroxide 30mg/L are added by ozone generator, by being catalyzed oxygen
Change, goes the partial organic substances in water removal, wastewater biodegradability is provided.Catalytic ozonation water outlet enters A/O-MBR film units 6,
COD, total nitrogen in further degradation water, and after the substances such as separating most suspended matter, colloid, bacterium, MBR water outlets enter MBR and produce
Pond 7.Then it is promoted again to cartridge filter by low-lift pump P4, enters two sections of reverse osmosis units 9, removal by high-pressure pump P5
Ion, suspended matter, soluble solid etc., product water enter production water reuse tank 33, and two sections of reverse osmosis concentrated waters are reverse osmosis into two sections
Concentrated water pond 10, is handled by primary concentration, can the TDS in concentrated water be concentrated into 32g/l.
Wherein, the materialized mud mixing that chemical tendering pond 2 is discharged flows into sludge treating system 3, then defeated by sludge pump P2
It send to sludge dewatering system 3, mud cake send to cement production device and realizes harmless treatment as cement producting material after dehydration.It is dirty
The pressing filtering liquid of mud dehydration is back to concentrated water regulating reservoir 1 with sludge dewatering equipment flushing water and is further processed.
Other settings and operation are the same as embodiment 1.
In the present embodiment, secondary concentration handles nanofiltration and produces the water rate of recovery up to 85%.It can be incited somebody to action by the second membrane distillation unit 30
TDS in concentrated water is concentrated into 220g/l.The haline water that a whole set of reaction system only has 2% enters evaporation and crystallization system, it can be achieved that being
The rate of recovery of system 98%.
Embodiment 3
The strong brine index of the chlor-alkali plant of the present embodiment processing is CODCr 180mg/L、BOD35mg/L、SS 100mg/L、
Phosphide 12mg/L, sulfide 8mg/L, TDS 8500.Processing method is as follows：
Primary concentration processing：
Strong brine in concentrated water regulating reservoir 1 is lifted into chemical tendering pond 2 through pump, lime, soda ash dosage be respectively
180mg/L and 280mg/L, then the polyaluminium sulfate of 12mg/L and the PAM (polyacrylamide) of 1.0mg/L are put into, remove waste water
In most of hardness, basicity and suspended state substance.The sludge that chemical tendering pond 2 generates is driven into sludge by sludge pump P2 and takes off
Water system 3.
The water outlet of chemical tendering pond 2 enters chemical tendering clear water reserviors 4, is then pumped into catalytic ozonation pond 5 with pump P3 again,
Ozone generator adds the hydrogen peroxide of the ozone of 40mg/L and 10% industrial hydrogen peroxide 40mg/L, passes through catalysis oxidation, removal
Partial organic substances in water, provide wastewater biodegradability.Catalytic ozonation water outlet enters A/O-MBR film units 6, further drops
COD, total nitrogen in Xie Shui, and after the substances such as separating most suspended matter, colloid, bacterium, MBR water outlets enter MBR and produce pond 7.So
It is promoted again to cartridge filter by low-lift pump P4 afterwards, enters two sections of reverse osmosis units 9 by high-pressure pump P5, removed deionization, hang
Float, soluble solid etc., product water enter production water reuse tank 33, and two sections of reverse osmosis concentrated waters enter two sections of reverse osmosis concentrated ponds
10, it is handled by primary concentration, the TDS in concentrated water can be concentrated into 28g/l.
Wherein, the materialized mud mixing that chemical tendering pond 2 is discharged flows into sludge treating system 3, then defeated by sludge pump P2
It send to sludge dewatering system 3, mud cake send to cement production device and realizes harmless treatment as cement producting material after dehydration.It is dirty
The pressing filtering liquid of mud dehydration is back to concentrated water regulating reservoir 1 with sludge dewatering equipment flushing water and is further processed.
Other settings and operation are the same as embodiment 1.
In the present embodiment, secondary concentration handles nanofiltration and produces the water rate of recovery up to 85%.It can be incited somebody to action by the second membrane distillation unit 30
TDS in concentrated water is concentrated into 220g/l.The haline water that a whole set of reaction system only has 2% enters evaporation and crystallization system, it can be achieved that being
The rate of recovery of system 98%.
Above embodiment be only the preferred embodiment of the present invention is described, not to the scope of the present invention into
Row limits, under the premise of not departing from design spirit of the present invention, technical side of this field ordinary engineering and technical personnel to the present invention
The all variations and modifications that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (9)
1. a kind of processing method of chlor-alkali plant strong brine zero-emission, using the processing system of chlor-alkali plant strong brine zero-emission, including
Primary concentration system, secondary concentration system and three-level concentration systems；
The primary concentration system includes concentrated water regulating reservoir connected in sequence and chemical tendering pond, and the chemical tendering pond is connected with
Chemical tendering clear water reserviors；The chemical tendering clear water reserviors are connected with catalytic ozonation pond, and the catalytic ozonation pond goes out
Water lines connect A/O-MBR membrane bioreactors, and the production mouth of a river of A/O-MBR membrane bioreactors is connected with two sections of reverse osmosis lists
The outlet pipeline of member, two sections of reverse osmosis units is connected with production water reuse tank；Two sections of reverse osmosis concentrated water lines enter two sections instead
Concentrated water pond is permeated, subsequently into secondary concentration system；
The secondary concentration system includes resin pliable cell connected in sequence and nano-filtration unit, the water producing pipe of the nano-filtration unit
Road is sequentially connected with high pressure reverse osmosis units, the first high-pressure flat plate film unit, and the water outlet of the first high-pressure flat plate film unit is logical
Production water reuse tank described in piping connection is crossed, the concentrated water pipeline of the first high-pressure flat plate film unit enters the first high-pressure flat plate film concentrated water
Pond, subsequently into the three-level concentration systems；The concentrated water pipeline of the nano-filtration unit is sequentially connected with filter and the second high-voltage flat
Plate film unit, the water outlet of the second high-pressure flat plate film unit is by producing water reuse tank described in piping connection；Second high-voltage flat
The concentrated water pipeline of plate film unit enters the second high-pressure flat plate film concentrated water pond, subsequently into the three-level concentration systems；
The three-level concentration systems include the first membrane distillation unit and the second membrane distillation unit, the first high-pressure flat plate film unit
Concentrated water piping connection the first membrane distillation unit, the water producing pipe road of the first membrane distillation unit connects the production water reuse tank；
Concentrated water piping connection the second membrane distillation unit of the second high-pressure flat plate film unit, the second membrane distillation unit water producing pipe road
Connect the production water reuse tank;
It the treating method comprises following steps：
Primary concentration processing：It adds one or more in lime, soda ash, coagulant, flocculation aid, makes to chlor-alkali plant strong brine
The mud-water separation of strong brine adds ozone and hydrogen peroxide in the water outlet on upper layer, then pass through A/O-MBR films biological unit, two sections
The processing of reverse osmosis units, product water enter production water reuse tank, and concentrated water carries out secondary concentration processing；
Secondary concentration processing：Concentrated water is discharged using high pressure reverse osmosis membrane processing, goes out through resin softening, nanofiltration membrane, nanofiltration
Water enters production water reuse tank, and concentrated water carries out three-level concentration；For nanofiltration concentrated water through high-pressure flat plate film process, product water enters production water
Reuse tank, concentrated water carry out three-level concentration, and the resin is macropore cation resin or chelate resin；
Three-level concentration：The concentrated water that high pressure reverse osmosis membrane processing generates is evaporated concentration, and product water enters production water reuse tank,
Concentrated water enters caustic soda factory brine system and carries out production reuse；
The concentrated water that high-pressure flat plate film process generates is evaporated concentration, and product water enters production water reuse tank, and concentrated water is evaporated knot
Crystalline substance, evaporation production water enter production water reuse tank, and the solid salt for crystallizing generation is then used as the dry salt disposition of solid waste.
2. processing method according to claim 1, which is characterized in that in the primary concentration system, A/O-MBR film biologies
The production mouth of a river of reactor is connected with MBR productions pond, and MBR productions pond is connected with the first cartridge filter by pipeline and low-lift pump,
Two sections of reverse osmosis units are connected using high-pressure pump, the lift of the low-lift pump is 10~100m, and the high-pressure pump is raised
Journey is 100~1600m.
3. processing method according to claim 1, which is characterized in that in the secondary concentration system, resin pliable cell
Outlet pipeline enter resin softening clear water reserviors, resin soften clear water reserviors by pipeline and low-lift pump be connected with the second security personnel filtering
Device connects the nano-filtration unit using high-pressure pump.
4. according to any processing method of claims 1 to 3, which is characterized in that described to receive in the secondary concentration system
The water producing pipe road of filter unit enters nanofiltration production pond, third cartridge filter is connected with by pipeline and low-lift pump, using height
Press pump connects the high pressure reverse osmosis units；
The water producing pipe roads of the high pressure reverse osmosis units connects the production water reuse tank, the first high-voltage flat described in concentrated water piping connection
Plate film unit is provided with bitter film or sea water desalination membrane in the high pressure reverse osmosis units；
The concentrated water pipeline of the nano-filtration unit enters nanofiltration concentrated water tank, and mechanical filter is connected with by pipeline and low-lift pump, then
The 5th cartridge filter is connected with low-lift pump by pipeline；5th cartridge filter connects the second high pressure with high-pressure pump by pipeline
Tablet film unit；
The lift of the low-lift pump is 10~100m, and the lift of the high-pressure pump is 100~1600m.
5. according to any processing method of claims 1 to 3, which is characterized in that in the three-level concentration systems, described the
The concentrated water pipeline of one membrane distillation unit enters the brine system of caustic soda factory；The concentrated water piping connection of the second membrane distillation unit is steamed
Crystallizer is sent out, evaporation water lines connect the production water reuse tank.
6. according to any processing method of claims 1 to 3, which is characterized in that the processing system further includes at sludge
Reason system, chemical tendering bottom of pond portion connect the sludge treating system；The sludge treating system includes that sludge dewatering is set
It is standby.
7. processing method according to claim 1, which is characterized in that the materialized mud mixing of chemical tendering pond discharge flows into
Then sludge treating system is delivered to device for dehydrating sladge waste dehydration by sludge pump, is sent to cement production device after mud cake after dehydration
Harmless treatment is realized as cement producting material；The pressing filtering liquid of sludge dewatering is back to concentrated water tune with sludge dewatering equipment flushing water
Section pond is further processed.
8. processing method according to claim 1, which is characterized in that in the primary concentration processing, to the dense salt of chlor-alkali plant
Water is added into 100~300mg/L of lime, 200~400mg/L of soda ash, 2~50mg/L of coagulant, 0~10mg/L of flocculation aid, institute
It is bodied ferric sulfate, aluminum sulfate, ferric trichloride, aluminium polychloride, polyaluminium sulfate, poly-ferric chloride, polysilicon acid to state coagulant
It is one or more in ferric sulfate, poly- phosphorus iron chloride, poly- phosphorus aluminium chloride, ferric-polysilicate, the flocculation aid be selected from polyacrylamide,
It is one or more in activated silicic acid, gelatine, sodium alginate.
9. processing method according to claim 1 or claim 7, which is characterized in that dense to chlor-alkali plant in the primary concentration processing
Brine puts into 10~100mg/L of ozone and 2~100mg/L of hydrogen peroxide, the ozone are generated with ozone generator, the hydrogen peroxide
Using the industrial grade hydrogen peroxide of a concentration of 10-15%.
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| CN108623083A (en) * | 2017-03-23 | 2018-10-09 | 中国石油化工股份有限公司 | A kind of advanced treatment and reclamation method of gas field output water |
| CN108623080A (en) * | 2017-03-23 | 2018-10-09 | 中国石油化工股份有限公司 | A kind of gas field output water reduces reuse method |
| CN110328218B (en) * | 2019-07-30 | 2020-10-23 | 湖南中森环境科技有限公司 | Resource utilization method of salt slag polluted by organic matters |
| CN110713300A (en) * | 2019-10-25 | 2020-01-21 | 内蒙古金河环保科技股份有限公司 | Wastewater reduction mixed salt treatment process |
| CN115140901A (en) * | 2022-07-21 | 2022-10-04 | 江苏卓博环保科技有限公司 | Treatment device and method for recycling sewage reaching standard and realizing zero discharge of liquid |
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