CN108264180A - The Zero discharge treatment method and system of a kind of high slat-containing wastewater - Google Patents

Abstract

The present invention relates to the Zero discharge treatment methods and system of a kind of high slat-containing wastewater, the evaporative crystallization technique of pretreating process, reduction process and high-salt concentrated water including waste water, the reduction process of waste water is to form high pressure reverse osmosis concentrated water after carrying out preliminary minimizing processing to pretreated waste water by middle pressure high pressure reverse osmosis unit, high-salt concentrated water is condensed into after firsts and seconds electrically-driven ion film device carries out depth concentration, the reduction process of waste water also recycles production water during minimizing to reuse water tank again；Firsts and seconds electrically-driven ion film device includes a spaced anode and a cathode, multiple films pair by anode membrane, cavity block and baffle combination are regularly arranged between it, anode membrane and cavity block are homogeneous membrane, it is the uniform partition board of fluidised form between two films, and the power supply of firsts and seconds electrically-driven ion film device automatically switches high-frequency direct-current power supply using positive-negative polarity, and utilizes Digital Program Control power supply.

Description

The Zero discharge treatment method and system of a kind of high slat-containing wastewater

The application is that original applying number is 201510981729.6, entitled：At a kind of zero-emission of high slat-containing wastewater The divisional application of reason method.

Technical field

The present invention relates to industrial waste water treatment more particularly to a kind of zero discharge treatment sides of high slat-containing wastewater Method.

Background technology

In recent years, it with the fast development of the industries such as petrochemical industry, electric power, metallurgy, coal chemical industry, is generated in industrial processes Wastewater flow rate containing complicated ingredient also increases year by year, and how these waste water containing complicated ingredient are disposed and received the problem of utilization wide General attention.Particularly in water resources shortage area, how to make good use of this effluent part, realize wastewater zero discharge, to protection we The surrounding enviroment and natural water depended on for existence further improve the comprehensive utilization ratio of water resource, alleviate water resource anxiety shape Condition is of great significance.

Waste water zero-discharge technology generally use reverse osmosis membrane (RO), electrodialysis (EDR), ultrafiltration (UF) and membrane reactor (MBR) technique etc. will be produced after waste water fully recycles, and remaining high slat-containing wastewater is recycled using techniques such as evaporations Processing.At present, reverse osmosis membrane treatment technology has been increasingly becoming in the fields such as industrial circulation water treatment, sewage and waste water recycling A kind of very important processing method.

Reverse osmosis membrane is very fast for handling waste water development, but the technology is existing in the waste water of processes composition complexity asks Topic is also increasingly prominent, and main problem shows two aspects：When the salt rejection rate that can reach of reverse-osmosis membrane element 98% with On, salt and more than 98% impurity in waste water are trapped in the concentrated water that separation is generated in system, and reverse osmosis membrane is to waste water Recovery utilization rate can only achieve 75% or so, and the concentrated water for still having 25% cannot utilize, and need direct emission.Reverse-osmosis membrane element The concentrated water of the part that equipment with high desalinization causes contains a large amount of calcium ions, magnesium ion, heavy metal ion, silicon ion, colloidal type and organic Pollutant etc., if the part concentrated water direct emission must be can cause environmental pollution.Concentrated water is directly steamed using multiple-effect Hair crystallization, then the quantity of steam consumed is big, and the processing cost of waste water is caused to increase.It is second is that reverse osmosis by low pressure, medium and high pressure The saliferous complexity waste water of concentration organic pollution and tends to the inorganic salts of saturation easily in film surface when recycling reverse osmosis unit processing Fouling occurs, separating difficulty increase, energy consumption is caused to increase, economy is bad, and reliability is relatively low.

For the processing method of complicated waste water with high salt, it is currently used have it is following several：First, to difficult to degrade in waste water Organic species carry out catalysis oxidation using oxidizing species, and the organic substance in waste water is made effectively to be degraded, oxidized Treated, and waste water enters back into biochemical device that organic matter therein is removed, through precipitation and filter device after directly arrange It puts.But the method acts on inorganic salts ingredients only for the organic species in waste water without removal substantially.Second, by calcium-magnesium-containing Waste water by softening after, then minimizing processing carried out with further recovery section water by secondary reverse osmosis unit, decrement The a small amount of concentrated water direct emission generated after change.Although the method can carry out raw water certain minimizing processing, reverse osmosis concentrated The concentration of the calcium ion, magnesium ion, heavy metal ion, silicon ion, the organic matter that contain in water etc. is very high, and common is reverse osmosis Or even sea water desalination membrane not high to its rate of recovery can only also accomplish 50% or so when film carries out secondary reverse osmosis so that discharge Concentrated water amount is still larger.Third is handled the high-salt concentrated water after minimizing using evaporation and crystallization apparatus, is formed mixed Salt realizes the zero-emission of waste water.The method handles more thoroughly to the high-salt wastewater after concentration, technology relative maturity, but the method It needs to consume a large amount of steam, the mixed salt of formation is solid dangerous waste, and processing cost is higher, and enterprise is difficult to receive.Comprehensive analysis above-mentioned three Kind processing method, current equal existing defects, it is difficult to for industrializing.

Chinese patent (publication No. CN104445788A) discloses a kind of high slat-containing wastewater treatment for reuse zero-emission and integrates Technique.After the process that the patent provides carries out softening pretreatment to high slat-containing wastewater first, successively by activated carbon adsorption And ultrafiltration apparatus, obtain pretreatment production water；Nanofiltration soft water and nanofiltration concentrated water are obtained by nanofiltration device；It is obtained by reverse osmosis unit Obtain reverse osmosis soft water and reverse osmosis concentrated water；Electrodialysis soft water and electrodialysis concentrated water are obtained by electrodialysis plant；Finally by steaming Hair crystallization apparatus is evaporated electrodialysis concentrated water crystallization treatment, and the salt that evaporative crystallization generates periodically is transported outward, and the water of generation enters In reuse water tank, it is finally completed high slat-containing wastewater treatment for reuse.The processing method that the patent provides employs high dense settling pond Technique, filtering technique, nanofiltration treatment process and ro treatment technology integrated technique, although can make to give up by above-mentioned technique Water reaches the requirement of zero-emission, and still, at least also there are following defects for the method which provides：(1) processing method only needle To low-concentration organic reverse osmosis concentrated water, to the high-salt wastewater treatment effect unobvious containing hardly degraded organic substance；(2) through processing Concentrated water afterwards easily makes the membrane component in device that fouling and organic fouling occur, and influences Sewage treatment rate；(3) patent lacks pair The further minimizing measure of waste water so that the concentrated water amount into evaporated crystallization device is big, and phase transformation has occurred in when evaporated water Journey, the high energy consumption that when evaporative crystallization consumes, processing cost increase.

Therefore it provides it is a kind of for the high-salt concentrated water reuse containing complicated ingredient and realize the economical of wastewater zero discharge and Environmentally friendly treatment process, becomes urgent problem to be solved.

Invention content

For the deficiency of the prior art, the present invention provides a kind of Zero discharge treatment method of high slat-containing wastewater, the sides Method includes the pretreating process of waste water, the reduction process of waste water and the evaporative crystallization technique of high-salt concentrated water, through the waste water Pretreating process after by the reduction process of the waste water and the evaporative crystallization technique of the high-salt concentrated water to recycle height Moisture and salt in brine waste, so as to fulfill the zero-emission of waste water, wherein, the pretreating process of the waste water is by adding Enter flocculation and/or precipitate medicament and the heavy metal ion in high slat-containing wastewater, hardness ions and organic are removed by chemical reactor The pH for adjusting waste water after substance again is alkalinity；The reduction process of the waste water is by middle pressure reverse osmosis unit and high pressure reverse osmosis Saturating device forms high pressure reverse osmosis concentrated water after preliminary minimizing processing is carried out to waste water after pretreatment, and the high pressure is reverse osmosis Concentrated water is condensed into height after level-one electrically-driven ion film device and two level electrically-driven ion film device carry out depth concentration again - salt concentrated water, and the reduction process of the waste water also recycles production water during minimizing to reuse water tank；The evaporation Crystallization processes be by nitre evaporated crystallization device and salt evaporated crystallization device under the conditions of negative pressure or micro-positive pressure to the high saliferous Salt in concentrated water is separately recovered and forms commodity sodium sulphate and commodity sodium chloride.

According to a preferred embodiment, the operating pressure of medium pressure reverse osmosis unit is 2.0~3.5MPa, in described The material for pressing reverse osmosis unit membrane component is aromatic polyamide composite material, and the width of flow path of the membrane component is 1.60 ~1.70mm；The operating pressure of the high pressure reverse osmosis unit is 3.5~4.5MPa, the high pressure reverse osmosis unit membrane component Material is aromatic polyamide composite material, and the width of flow path of the membrane component is 2.00~2.10mm.Preferably, it is described The width of flow path of middle pressure reverse osmosis unit membrane component is 1.65mm, and the width of flow path of the high pressure reverse osmosis unit membrane component is 2.03mm。

According to a preferred embodiment, the level-one electrically-driven ion film device and two level electrically-driven ion film dress It puts including a spaced anode and a cathode, is regularly arranged by anode membrane, the moon between the anode and the cathode Multiple films pair of film and baffle combination, the anode membrane and the cavity block hinder high performance homogeneous membrane for low film, are fluidised form between two films Uniform partition board, and the power supply of the level-one electrically-driven ion film device and the two level electrically-driven ion film device is using just Negative polarity automatically switches high-frequency direct-current power supply, and utilizes Digital Program Control power supply, is exported using adjustable clearance high frequency oscillation high The frequency electric current of falling polarity DC destroys the calcium and magnesium under the high concentration multiple in polarization layer to upset the polarization layer easily formed in film surface Cation destroys crystallization process and its molecule is caused to be disproportionated.Physical scale inhibition is played, optimizes the effect of hydrodynamic condition, is effectively reduced Power consumption 30-50%.

According to a preferred embodiment, the pretreating process of the waste water is completed as follows：In regulating reservoir It is middle that waste water is subjected to homogeneous and is sent into highly dense pond after measuring adjusting, lime is sequentially added into the highly dense pond by chemicals dosing plant Or sodium hydroxide, sodium carbonate, aluminium polychloride and polyacrylamide and pass through chemical reactor waste water is flocculated and/or sunk Shallow lake is handled, and the concentrated water generated after chemical reactor processing enters first after tubular type microstrainer and candle filter filtering Intermediate pool, and the pH of waste water in first intermediate pool is adjusted to 8.0~9.5.Preferably, the tubular type microstrainer Filter sizes are 1~5 μm, can further remove the substances such as the sediment, the coagulation colloid that chemically react generation.

According to a preferred embodiment, generated in the sludge and the tubular type microstrainer that are generated in the highly dense pond Sludge is discharged into sludge-tank and after sludge dehydration device carries out mud-water separation, and the mud cake of generation carries out dewatered sludge disposition, generates Water enter the regulating reservoir in mix to carry out circular treatment with untreated waste water.

According to a preferred embodiment, the minimizing treatment process of the waste water is completed as follows：First During the waste water after pretreatment that intermediate pool is collected is formed by the preliminary minimizing processing of medium pressure reverse osmosis unit progress Pressure reverse osmosis concentrated water is simultaneously discharged into middle pressure concentrated water pond, and the middle pressure reverse osmosis concentrated water that medium pressure concentrated water pond is collected is anti-by the high pressure Permeability apparatus further carries out preliminary minimizing processing and forms high pressure reverse osmosis concentrated water and be discharged into high-pressure thick pond, and medium pressure is anti- The middle pressure reverse osmosis produced water and high pressure reverse osmosis produced water that permeability apparatus and the high pressure reverse osmosis unit are formed are through two-pass reverse osmosis Enter recycle-water case after device and fresh water tanks.

According to a preferred embodiment, high pressure reverse osmosis concentrated water in the high-pressure thick pond through active carbon filter and The second intermediate pool is discharged into carry out depth concentration after resin container processing, it is after pretreatment in second intermediate pool The level-one electric drive film concentrated water that is formed and pass through after high pressure reverse osmosis concentrated water is handled by the level-one electrically-driven ion film device First strong brine case further carries out depth concentration into the two level electrically-driven ion film device, is driven through the two level electricity High-salt concentrated water is condensed into after dynamic ion-exchange membrane facility processing and enters the second strong brine case, passes through the level-one electrically-driven ion film The level-one electric drive formed after device processing produces water and enters described return after the second level reverse osmosis apparatus and the fresh water tanks Use water tank.

According to a preferred embodiment, waste water after pretreatment passes through the first booster pump in first intermediate pool Medium pressure reverse osmosis unit, and the security personnel of first cartridge filter are entered back into after being filtered into the first cartridge filter Filter core is three layers of staged filter core, and the size of three layers of staged filter core is respectively 10 μm, 15 μm and 20 μm；In described Middle pressure reverse osmosis concentrated water in pressure concentrated water pond enters back into the height after entering the filtering of the second cartridge filter by the second booster pump Press reverse osmosis unit, and security personnel's filter core of second cartridge filter be three layers of staged filter core, three layers of rank The size of ladder type filter core is respectively 5 μm, 10 μm and 15 μm；High pressure after pretreatment is reverse osmosis concentrated in second intermediate pool Water enters back into the level-one electrically-driven ion film device, and institute after entering the filtering of third cartridge filter by third booster pump The security personnel's filter core for stating third cartridge filter is three layers of staged filter core, and the size of three layers of staged filter core is respectively 1 μm, 5 μm and 10 μm.

According to a preferred embodiment, the evaporative crystallization technique of the high-salt concentrated water is completed as follows： High-salt concentrated water in second strong brine case is evaporated crystallization under negative pressure or micro-positive pressure by the nitre evaporated crystallization device, steams It is centrifuged after the chilled nitre crystallization apparatus freezing and crystallizing of nitre mother liquor that hair crystallization generates by freezing nitre centrifugal separator, centrifugation The ten water nitre return generated is centrifuged machine after melting with what is generated through the nitre evaporated crystallization device containing solid nitre liquid heat and detaches again Go out solid sodium sulfate, through being dried to obtain commodity anhydrous sodium sulfate, pass through the freezing of the freezing nitre centrifugal separator centrifugation generation Nitre mother liquor isolates solid sodium chloride under negative pressure or micro-positive pressure through salt evaporated crystallization device evaporative crystallization, through being dried to obtain commodity Anhydrous sodium chloride.

According to a preferred embodiment, the indirect steam that the nitre evaporated crystallization device evaporation generates passes through the first steam After compressor compresses heat up and boost, and the high-salt concentrated water after the preheating of feedstock preheater is continuously by primary heater Thermal energy is provided to reach boiling point, the indirect steam that the salt evaporated crystallization device evaporation generates is compressed by the second vapour compression machine And by being boiled after secondary heater raising temperature and pressure for the circulating-heating of heater (314) inside cold nitre mother liquor with reaching Point.

The Zero discharge treatment method of high slat-containing wastewater provided by the invention at least has following advantage：

(1) present invention is carried out at preliminary minimizing waste water by using middle pressure reverse osmosis unit and high pressure reverse osmosis unit After reason, reuse level-one electrically-driven ion film device and two level electric drive film ion unit and depth concentration carried out to waste water, The separation for the treatment of fluid process without phase-change in entire technical process, for the yield of waste water up to more than 95%, only production has 5% or so High-salt concentrated water greatly reduces the energy consumption needed for evaporation and crystal process, so as to reduce the processing cost of waste water.

(2) evaporation and crystal process of the invention improves the temperature of indirect steam by vapour compression machine, and make to use it to Temperature raising is carried out to feed liquid, high-salt concentrated water is heated instead of raw steam, without reusing raw steam, raw steaming can be substantially reduced The dosage of vapour；On the other hand, by being evaporated crystallization to high-salt concentrated water, separate and recover sodium sulphate in high-salt concentrated water and Sodium chloride collects the condensed water that evaporative crystallization generates and enters reuse water tank, it can be achieved that the zero-emission of high slat-containing wastewater.

(3) fouling and dirty stifled easily occurs on reverse osmosis membrane surface for organic matter in the prior art and calcium ions and magnesium ions to ask Topic, this invention takes two kinds of measures：When waste water is flocculated and/or precipitated using chemical method in preprocessing process After processing, heavy-metal ion removal, calcium ions and magnesium ions and partial organic substances matter and adjust pretreatment after waste water pH for alkalinity, make Waste water is obtained when being handled into reverse osmosis unit, is avoided that organic fouling and calcium ions and magnesium ions in reverse osmosis membrane surface scale The problem of；Second is that the runner of increase reverse-osmosis membrane element so that reverse osmosis unit membrane component is not susceptible to ion fouling and organic The problem of fouling.

Description of the drawings

Fig. 1 is the block diagram of the Zero discharge treatment method system for use in carrying of the present invention；

Fig. 2 is the device block diagram of the pretreating process of the Zero discharge treatment method of the present invention；

Fig. 3 is the device block diagram of the reduction process of the Zero discharge treatment method of the present invention；

Fig. 4 is the device block diagram of the evaporative crystallization technique of the Zero discharge treatment method of the present invention.

Reference numerals list

10：Pretreatment unit 20：Minimizing unit 30：Evaporative crystallization sub-prime salt unit

21：Preliminary minimizing unit 22：Depth upgrading unit 101：Regulating reservoir

102：Highly dense pond 103：Chemicals dosing plant 104：Tubular type microstrainer

105：Candle filter 106：First intermediate pool 107：Sludge-tank

108：Sludge dehydration device 201：Second level reverse osmosis apparatus 202：Fresh water tanks

203：Reuse water tank 211：Middle pressure reverse osmosis unit 212：Middle pressure concentrated water pond

213：High pressure reverse osmosis unit 214：High-pressure thick pond 221：Active carbon filter

222：Resin container 223：Second intermediate pool

224：Level-one electrically-driven ion film device 225：First strong brine case

226：Two level electrically-driven ion film device 227：Second strong brine case

301：Feedstock preheater 302：Nitre evaporated crystallization device 303：Nitre thickener

304：Centrifugal separator 305：Nitre mother liquor tank 306：First baker

307：First metering packing device 308：Nitre mother liquor pump 309：Freeze nitre crystallization apparatus

310：First settler 311：Freeze nitre centrifugal separator 312：Freeze nitre mother liquor tank

313：Cold nitre mother liquor pump 314：Heater 315：Salt evaporated crystallization device

316：First life steam unit 317：Primary heater 318：First vapour compression machine

319：Cooling water system 320：Refrigerator 321：Cooler

322：Vacuum system 323：Nitre circulating pump 324：Second life steam unit

325：Secondary heater 326：Second vapour compression machine 327：Circulating pump

328：Second settler 329：Salt centrifugal separator 330：Second baker

331：Second metering packing device 332：Cold nitre circulating pump

Specific embodiment

It is described in detail with reference to the accompanying drawings and examples.

The present invention high slat-containing wastewater refer to refinery(waste) water, coal chemical industrial waste water, circulatory system sewerage, reverse osmosis concentrated water with And waste water containing complicated ingredient etc. in sewage treatment plant.The TDS of the high slat-containing wastewater of the present invention is 5000~10000mg/L. Total dissolved solid content i.e. in 1L high slat-containing wastewaters is 5000~10000mg.

The Zero discharge treatment method of high slat-containing wastewater provided by the invention, total inventive concept is will be useless by pretreatment After heavy metal ion, calcium ions and magnesium ions and the removal of partial organic substances matter in water, then by reverse osmosis unit to high slat-containing wastewater Preliminary minimizing processing is carried out to recycle the partial moisture in waste water, reverse osmosis concentrated water is carried out again by electric drive film device deep Concentration is spent, the high-salt concentrated water formed after concentration will be carried out and be sent into evaporative crystallization sub-prime salt device, tied by evaporating Brilliant sub-prime salt device separates and recovers salt therein, so as to fulfill the zero-emission of waste water and the recycling of solid salt.This hair The thinking of bright offer can make the rate of recovery of waste water greatly reduce place of the evaporated crystallization device to high-salt concentrated water up to more than 95% Reason amount, and water occurs without phase-change in separation process, so as to reduce the energy consumption in processing procedure.The present invention is not limited to make Preliminary minimizing processing, preliminary minimizing processing are carried out to high slat-containing wastewater with middle pressure reverse osmosis unit and high pressure reverse osmosis unit Device in technique can also have super-pressure reverse osmosis unit.Present invention is also not necessarily limited to use level-one electrically-driven ion film device and Two level electrically-driven ion film device carries out depth concentration to high pressure reverse osmosis concentrated water, the device in depth concentration technique There can also be three-level electrically-driven ion film device, even multistage electrically-driven ion film device.

The Zero discharge treatment method of high slat-containing wastewater provided by the invention includes the decrement of the pretreating process of waste water, waste water The evaporative crystallization technique of chemical industry skill and high-salt concentrated water.Fig. 1 shows the frame of the Zero discharge treatment method system for use in carrying of the present invention Figure.As shown in Figure 1, the Zero discharge treatment method system for use in carrying of high slat-containing wastewater includes pretreatment unit 10, minimizing unit 20 With evaporative crystallization sub-prime salt unit 30.Minimizing unit 20 is again including preliminary minimizing unit 21 and depth upgrading unit 22.Through After pretreating process, high slat-containing wastewater can be recycled by the reduction process of waste water and the evaporative crystallization technique of high-salt concentrated water In moisture and salt, so as to fulfill the zero-emission of waste water and the recycling of salt.Wherein, the pretreating process of waste water is logical Cross add in flocculation and/or precipitation medicament and by chemical reactor remove high slat-containing wastewater in heavy metal ion, hardness ions and Organic substance.The pH that waste water is adjusted after heavy metal ion, hardness ions and organic substance are removed is alkalinity.The minimizing of waste water Technique is that waste water after pretreatment is tentatively reduced by middle pressure reverse osmosis unit 211 and high pressure reverse osmosis unit 213 High pressure reverse osmosis concentrated water is formed after change processing.High pressure reverse osmosis concentrated water drives through level-one electrically-driven ion film device 224 and two level electricity Dynamic ion-exchange membrane facility 226 is condensed into high-salt concentrated water after carrying out depth concentration.The reduction process of waste water further includes recycling Production water during minimizing is to reuse water tank 203.Evaporative crystallization technique is by nitre evaporated crystallization device 302 and salt evaporation knot Brilliant device 315 is separately recovered the salt in high-salt concentrated water under the conditions of negative pressure or micro-positive pressure and forms quotient through the processes such as dry Product sodium sulphate and commodity sodium chloride.

According to a preferred embodiment, the operating pressure of middle pressure reverse osmosis unit 211 is 2.0~3.5MPa.Middle pressure is anti- The material of 211 membrane component of permeability apparatus is aromatic polyamide composite material.The runner of middle pressure 211 membrane component of reverse osmosis unit is wide It spends for 1.60~1.70mm.The operating pressure of high pressure reverse osmosis unit 213 is 3.5~4.5MPa.213 film of high pressure reverse osmosis unit The material of element is aromatic polyamide composite material.The width of flow path of 213 membrane component of high pressure reverse osmosis unit for 2.00~ 2.10mm..Preferably, the width of flow path of middle pressure 211 membrane component of reverse osmosis unit is 1.65mm.213 film of high pressure reverse osmosis unit The width of flow path of element is 2.03mm.Preferably, middle pressure reverse osmosis unit 211 is using press mold element in extraordinary concentration antipollution GTR3-8040F-65.High pressure reverse osmosis unit 213 is using extraordinary concentration antipollution high pressure membrane component GTR4-8040F-80.Middle pressure The material of 213 membrane component of 211 membrane component of reverse osmosis unit and high pressure reverse osmosis unit is aromatic polyamide composite material, can Remove in waste water at least more than 90% target heavy metal.Specifically, aromatic polyamide film can also remove cadmium in waste water, chromium, Copper, iron, nickel, zinc, manganese, magnesium and other similar heavy metals.Aromatic polyamide film has very high removal efficiency to heavy metal, especially Be can be removed from waste water at least 99% arsenic, at least 98% nickel, at least 97% manganese, at least 99% magnesium, 94% Chromium and at least 80% calcium, copper and zinc.On the other hand, aromatic polyamide film also has equipment with high desalinization, being capable of efficient removal Molecular weight is more than 100 nanoscale pollutant, such as anion.Middle pressure reverse osmosis unit 211 and high pressure reverse osmosis unit 213 exist The pressure of 2.0~4.5MPa carries out preliminary minimizing processing to high slat-containing wastewater, compared to conventional reverse-osmosis treated, processing It is more efficient.

According to a preferred embodiment, level-one electrically-driven ion film device 224 and two level electrically-driven ion film device 226 Including a spaced anode and a cathode.It is regularly arranged between anode and cathode by anode membrane, cavity block and partition board group The multiple films pair closed.Anode membrane and cavity block hinder high performance homogeneous membrane for low film.It is the uniform partition board of fluidised form between two films.Level-one electricity drives The power supply of dynamic ion-exchange membrane facility 224 and two level electrically-driven ion film device 226 automatically switches high-frequency DC using positive-negative polarity Source, and utilize Digital Program Control power supply.Level-one electrically-driven ion film device 224 and two level electrically-driven ion film device 226 are adopted The high frequency electric current of falling polarity DC is exported to upset the polarization layer easily formed in film surface with adjustable clearance high frequency oscillation, destroys polarization Calcium and magnesium cation under high concentration multiple in layer, destroys crystallization process and its molecule is caused to be disproportionated.Level-one electrically-driven ion film fills Put 224 and two level electrically-driven ion film device 226 can play physical scale inhibition, optimize the effect of hydrodynamic condition, effectively reduce dynamic Power consumes 30-50%.

According to a preferred embodiment, the pretreating process of waste water is completed as follows：In regulating reservoir 101 Highly dense pond 102 is sent into after waste water is carried out homogeneous and amount adjusting.It is sequentially added by chemicals dosing plant 103 into highly dense pond 102 Lime or sodium hydroxide, sodium carbonate, aluminium polychloride and polyacrylamide and pass through chemical reactor flocculated to waste water and/ Or precipitation process.The concentrated water generated after chemical reactor is handled filters laggard through tubular type microstrainer 104 and candle filter 105 Enter the first intermediate pool 106.Preferably, the filter sizes of tubular type microstrainer are 1~5 μm, the precipitation that can will chemically react generation The substances such as object, coagulation colloid further remove.The pH of waste water in first intermediate pool 106 is adjusted to 8.0~9.5.Alkaline ring Border helps to inhibit organic matter and calcium ions and magnesium ions in reverse osmosis membrane surface scale.The sludge and tubular type generated in highly dense pond 102 The sludge generated in microstrainer 104 is discharged into sludge-tank 107.Sludge in sludge-tank 107 carries out mud through sludge dehydration device 108 Water detaches.The mud cake of generation carries out dewatered sludge disposition.The water of generation enter in regulating reservoir 101 mixed with untreated waste water with into Row circular treatment.

According to a preferred embodiment, there is the chemical reaction of organics removal, colloid, hardness ions in highly dense pond 102 Device.Medicament and waste water not only can be at a high speed sufficiently mixed by chemical reactor, be also beneficial to the generation of flco, more will can effectively be consolidated Liquid detaches.Chemical reactor is conducive to flco adsorbing contaminant using column plate by the vortex microkinetic pole that flow generates so that adds in few The flocculant of amount is the effect that can reach deep purifying.On the other hand, chemical reactor can also make a small amount of flocculant of addition most Limits generate the big flocculating body that fluffy body is big, adsorption capacity is strong.Chemical reactor so that the medicament utilization rate added in is high, can be with Reduce the processing cost of waste water.

The present invention is removed the hardness ions such as heavy metal ion, calcium and magnesium using chemical method in preprocessing process, simultaneously Remove most COD and organic colloidal matter so that waste water can avoid organic fouling and calcium and magnesium when being further processed The problem of fouling.On the other hand, wastewater pH after pretreatment is adjusted to 8.0~9.5 alkaline environment, can be further suppressed The problem of reverse osmosis membrane surface scale and organic pollution.

According to a preferred embodiment, the minimizing treatment process of waste water is completed as follows：Among first The waste water after pretreatment that pond 106 is collected carries out preliminary minimizing processing by middle pressure reverse osmosis unit 211.It is pressed in anti- The middle pressure reverse osmosis concentrated water that 211 processing of permeability apparatus is formed is discharged into middle pressure concentrated water pond 212.The middle pressure that middle pressure concentrated water pond 212 is collected Reverse osmosis concentrated water further carries out preliminary minimizing processing by high pressure reverse osmosis unit 213.At high pressure reverse osmosis unit 213 The high pressure reverse osmosis concentrated water that reason is formed is discharged into high-pressure thick pond 214.Middle pressure reverse osmosis unit 211 and high pressure reverse osmosis unit 213 The middle pressure reverse osmosis produced water and high pressure reverse osmosis produced water formed is discharged into second level reverse osmosis apparatus 201.Middle pressure reverse osmosis produced water and height Reverse osmosis produced water is pressed to enter recycle-water case 203 after second level reverse osmosis apparatus 201 and fresh water tanks 202.In high-pressure thick pond 214 High pressure reverse osmosis concentrated water be discharged into the second intermediate pool 223 after active carbon filter 221 and resin container 222 are handled to carry out depth Spend concentration.High pressure reverse osmosis concentrated water after pretreatment passes through level-one electrically-driven ion film and fills in second intermediate pool 223 Put the level-one electric drive film concentrated water formed after 224 processing.Level-one electric drive film concentrated water enters two level by the first strong brine case 225 Electrically-driven ion film device 226 further carries out depth concentration.Level-one electric drive film concentrated water is through two level electrically-driven ion film High-salt concentrated water is condensed into after the processing of device 226 and enters the second strong brine case 227.Pass through level-one electrically-driven ion film device The level-one electric drive production water formed after 224 processing is discharged into second level reverse osmosis apparatus 201.Level-one electric drive produces water through two-pass reverse osmosis Enter recycle-water case 203 after device 201 and fresh water tanks 202.During the adsorbable preliminary minimizing of active carbon filter 221 not The chlorine of removal, while adsorb small organic molecule, colloid and heavy metal ion.Resin container 222 has ion exchange resin, is used for Adsorb the chemical ion in solution after the processing of active carbon filter 221.High pressure reverse osmosis concentrated water enter level-one electric drive from It is pre-processed before sub- film device 224 through active carbon filter 221 and resin container 222, can reach high pressure reverse osmosis concentrated water The inflow requirement of level-one electrically-driven ion film device 224 reduces the damage to level-one electrically-driven ion film device 224.

According to a preferred embodiment, waste water after pretreatment passes through the first booster pump in the first intermediate pool 106 Middle pressure reverse osmosis unit 211 is entered back into after being filtered into the first cartridge filter.Security personnel's filter core of first cartridge filter For three layers of staged filter core.The size of three layers of staged filter core is respectively 10 μm, 15 μm and 20 μm.In middle pressure concentrated water pond 212 Middle pressure reverse osmosis concentrated water enters back into high pressure reverse osmosis unit 213 after entering the filtering of the second cartridge filter by the second booster pump. Security personnel's filter core of second cartridge filter is three layers of staged filter core.The size of three layers of staged filter core is respectively 5 μm, 10 μm and 15 μm.High pressure reverse osmosis concentrated water after pretreatment enters third by third booster pump and protects in second intermediate pool 223 Level-one electrically-driven ion film device 224 is entered back into after peace filter filtering.Security personnel's filter core of third cartridge filter is three Layer staged filter core.The size of three layers of staged filter core is respectively 1 μm, 5 μm and 10 μm.Cartridge filter can be used for removing small Quartz sand, active carbon particle etc., the damage to device is reduced to ensure waste water when entering next device.First security personnel's filtering The filter core of device, the second cartridge filter and third cartridge filter using three layers of staged filter core, can make small in waste water Grain substance gradually remove, also, the filter core size of the first cartridge filter, the second cartridge filter and third cartridge filter according to Secondary reduction can further remove the smaller particulate matter that cannot be removed in a previous step.

According to a preferred embodiment, after reverse osmosis unit 211 being pressed to handle in, 70% middle pressure formed above of water inlet Reverse osmosis produced water simultaneously enters recycle-water case 203, remaining 30% middle pressure reverse osmosis concentrated water formed below.Middle pressure reverse osmosis concentrated water is made Water inlet for high pressure reverse osmosis unit 213.After the processing of high pressure reverse osmosis unit 213,65% high pressure formed above of water inlet is anti- Infiltration production water simultaneously enters recycle-water case 203, remaining 35% high pressure reverse osmosis concentrated water formed below.High pressure reverse osmosis concentrated water conduct The water inlet of level-one electrically-driven ion film device 224.After the processing of level-one electrically-driven ion film device 224, more than the 75% of water inlet It forms level-one electric drive production water and enters recycle-water case 203, remaining 25% level-one electric drive film concentrated water formed below.Level-one electricity Water inlet of the drive membrane concentrated water as two level electrically-driven ion film device 226.

After above-mentioned preliminary minimizing and depth concentration, more than the 95% of waste water can recycle, and the 5% of waste water It is condensed into high-salt concentrated water below.

According to a preferred embodiment, the evaporative crystallization technique of high-salt concentrated water is completed as follows：Second High-salt concentrated water in strong brine case 227 is evaporated crystallization under negative pressure or micro-positive pressure by nitre evaporated crystallization device 302.Gao Han By freezing nitre centrifugal separator after chilled 309 freezing and crystallizing of nitre crystallization apparatus of nitre mother liquor that salt concentrated water is generated through evaporative crystallization 311 centrifuge, centrifuge generation ten water nitre return with through nitre evaporated crystallization device 302 generates contain consolidate nitre liquid heat melt after pass through again Centrifugal separator 304 isolates commodity solid sodium sulfate, through being dried to obtain commodity anhydrous sodium sulfate.Chilled nitre centrifugal separator The freezing nitre mother liquor that 311 centrifugations generate isolates chlorination under negative pressure or micro-positive pressure through 315 evaporative crystallization of salt evaporated crystallization device Sodium solid, through being dried to obtain commodity anhydrous sodium chloride.Preferably, the indirect steam that the evaporation of nitre evaporated crystallization device 302 generates leads to After crossing the first vapour compression machine 318 compression heating and boosting, and it is continuously by primary heater 317 through feedstock preheater High-salt concentrated water after 301 preheatings continues to provide thermal energy to reach boiling point.The secondary steaming that the evaporation of salt evaporated crystallization device 315 generates Vapour is compressed by the second vapour compression machine 326 and is used for inside heater 314 after improving temperature and pressure by secondary heater 325 High-salt concentrated water circulating-heating after preheated is to reach boiling point.Meanwhile the evaporative crystallization technique of high-salt concentrated water will be evaporated and be tied Condensing hot air furnace during crystalline substance is to reuse water tank 203.

By the evaporative crystallization technique of the present invention, the purity of commodity sodium sulphate isolated is isolated 96% or so The purity of commodity sodium chloride is more than 98%.The Zero discharge treatment method of high slat-containing wastewater provided by the invention can not only be realized The zero-emission of waste water, and the processing cost of high slat-containing wastewater can be reduced.The present invention provides a kind of strong height of industrial feasibility The Zero discharge treatment method of brine waste.

Embodiment 1

The level-one electrically-driven ion film device 224 and the structure of two level electrically-driven ion film device 226 used with the present invention For.

Level-one electrically-driven ion film device 224 and two level electrically-driven ion film device 226 include a spaced anode With a cathode.Multiple films pair by anode membrane, cavity block and baffle combination are regularly arranged between anode and cathode.Anode membrane and the moon Film hinders high performance homogeneous membrane for low film.It is the uniform partition board of fluidised form between two films.Level-one electrically-driven ion film device 224 and two level The power supply of electrically-driven ion film device 226 automatically switches high-frequency direct-current power supply using positive-negative polarity, and utilizes Digital Program Control Power supply.Level-one electrically-driven ion film device 224 and two level electrically-driven ion film device 226 are using the output of adjustable clearance high frequency oscillation The high frequency electric current of falling polarity DC destroys the calcium under the high concentration multiple in polarization layer to upset the polarization layer easily formed in film surface Magnesium cation destroys crystallization process and its molecule is caused to be disproportionated.Level-one electrically-driven ion film device 224 and two level electrically-driven ion film Device 226 can play physical scale inhibition, optimize the effect of hydrodynamic condition, effectively reduce power consumption 30-50%.

Diaphragm is amberplex.Preferably, cathode diaphragm is cation-exchange membrane, and anode diaphragm is anion exchange Film.Under the action of extra electric field, cation-exchange membrane only allows the luxuriant son of sun to pass through, and anionic membrane only allows anion to lead to It crosses.Uncharged molecule and organic matter cannot penetrate diaphragm, it can be achieved that the directional migration of charged ion.It is formed between each pair of film pair dense The concentration and desalination of Halite water in water are realized in brine chamber and light salt brine room.

According to a preferred embodiment, electrically-driven ion film device essential structure is made of membrane stack, mainly have locking frame, Into material frame, zwitterion film, partition board, cloth sink, filter, electrode and pole room, press etc..The thickness of partition board is in 0.5~2.0mm. Membrane stack is made of again several films to being alternately arranged, and enriched chamber, desalting chamber are formed by zwitterion film and net partition board.It is preprocessed High-salt concentrated water enter in the compartment of electrically-driven ion film device, electrically-driven ion film device is in the effect of applying direct current electric field Under, the anions and canons directed movement in high-salt concentrated water, anion is moved to anode direction, and cation is moved to cathode direction. Since amberplex has selective penetrated property, the fixation cation exchange groups of cation-exchange membrane are negatively charged, therefore allow in water Cation is by stopping anion；The fixation cation exchange groups of anion-exchange membrane are positively charged, thus allow in water it is cloudy from Son is caused in the Ion transfer to concentrated water compartment in fresh water compartment by stopping cation, make in high-salt concentrated water from Son is detached from saline solns, concentrated water and desalination fresh water so as to be concentrated.

Embodiment 2

By taking the pretreating process of waste water as an example.

As shown in Fig. 2, the device of the pretreating process of waste water includes at least regulating reservoir 101, highly dense pond 102, chemicals dosing plant 103rd, tubular type microstrainer 104, candle filter 105, the first intermediate pool 106, sludge-tank 107 and sludge dehydration device 108.

The waste water that regulating reservoir 101 sends each pipeline carries out homogeneous and amount is adjusted.It is through homogeneous and useless after amount adjusting Water is pumped by being promoted in highly dense pond 102.Lime or hydrogen-oxygen are added by waste water of the chemicals dosing plant 103 into highly dense pond 102 Change sodium, sodium carbonate, aluminium polychloride and polyacrylamide.Preferably, the pharmaceutical quantities of addition should not be too large, and need according to water quality reality Border situation is adjusted correspondingly, and otherwise easily causes fouling membrane, influences the service life of film.Preferably, sodium hydroxide is configured to A concentration of 20% solution, addition 1.5g/L.Sodium carbonate is configured to a concentration of 15% solution, addition 3.0g/L. Aluminium polychloride is configured to a concentration of 20% solution, addition 30mg/L.Polyacrylamide is configured to a concentration of 0.3% Solution, addition 3mg/L.After flocculation and/or precipitation reaction occur for chemical agent and waste water, the waste water in highly dense pond 102 It is divided into upper strata concentrated water and lower floor's sludge.Upper strata concentrated water enters tubular type microstrainer 104 and is further filtered, and lower floor's sludge is discharged into dirt In mud sump 107.Preferably, residence time of the upper strata concentrated water in tubular type microstrainer 104 is 2.5h, is acted on through natural subsidence, point Separate out supernatant liquor and lower floor's sludge.Supernatant liquor is discharged into the first intermediate pool 106 through candle filter 105, next to carry out Walk minimizing processing.The sludge that tubular type microstrainer 104 generates is discharged into sludge-tank 107.Sludge-tank 107 leads to the sludge being collected into It crosses sludge dehydration device 108 and carries out mud-water separation, obtained mud cake carries out dewatered sludge disposition, and obtained water is back to regulating reservoir Circular treatment in 101.Preferably, the clear water that the first intermediate pool 106 is collected is adjusted to alkaline environment.

The pretreating process of the present invention passes through tubular type micro-filtration by the flocculation and/or precipitation reaction in highly dense pond 102 The concentrated water that device 104 and candle filter 105 generate reaction further filters, can obtain eliminating heavy metal ion, hardness from The clear water of son and organic matter, the pH that clear water is adjusted in the first intermediate pool 106 is alkaline environment, so as to prevent organic matter Fouling occurs on reverse osmosis membrane surface with calcium ions and magnesium ions and dirt is blocked up.

Embodiment 3

By taking the minimizing treatment process of waste water as an example.

The reduction process of waste water includes preliminary reduction process and depth concentration technology.As shown in figure 3, preliminary minimizing The device of technique includes at least middle pressure reverse osmosis unit 211, middle pressure concentrated water pond 212, high pressure reverse osmosis unit 213 and high pressure concentrated water Pond 214.The device of depth concentration technology includes at least active carbon filter 221, resin container 222, the second intermediate pool 223, one Grade electrically-driven ion film device 224, the first strong brine case 225, two level electrically-driven ion film device 226 and the second strong brine case 227.The device of reduction process further includes second level reverse osmosis apparatus 201, fresh water tanks 202 and reuse water tank 203.

The waste water after pretreatment that first intermediate pool 106 is collected passes through middle pressure reverse osmosis unit 211 and high pressure reverse osmosis Saturating device 213 carries out preliminary minimizing processing.Middle pressure reverse osmosis unit 211 by the first booster pump and the first cartridge filter with First intermediate pool 106 connects.Pressed in reverse osmosis unit 211 during treated pressure reverse osmosis concentrated water be discharged into middle pressure concentrated water pond In 212.Middle pressure reverse osmosis concentrated water in middle pressure concentrated water pond 212 is entered after the filtering of the second cartridge filter again by the second booster pump Into high pressure reverse osmosis unit 213.It is middle pressure reverse osmosis concentrated water through the high pressure reverse osmosis concentrated water that high pressure reverse osmosis unit 213 is handled into Enter high-pressure thick pond 214 and wait for depth concentration.Concentrated water in high-pressure thick pond 214 is through 221 He of active carbon filter Resin container 222 enters the second intermediate pool 223 after further removing the hardness ions in concentrated water.It is passed through in second intermediate pool 223 Pretreated high pressure reverse osmosis concentrated water, which is entered by third booster pump after the filtering of third cartridge filter, enters back into the drive of level-one electricity Dynamic ion-exchange membrane facility 224.Concentrated water in second intermediate pool 223 is through level-one electrically-driven ion film device 224 and two level electric drive Ion-exchange membrane facility 226 carries out the high-salt concentrated water formed after depth concentration and enters the second strong brine case 227.Preferably, The production formed after reverse osmosis unit 211, high pressure reverse osmosis unit 213 and level-one electrically-driven ion film device 224 being pressed to handle in Water enters second level reverse osmosis apparatus 201, and production water enters 203 reuse of recycle-water case after fresh water tanks 202.

Preferably, the material of middle pressure 211 membrane component of reverse osmosis unit is aromatic polyamide composite material, and operating pressure is 2.0~3.5MPa.Middle pressure reverse osmosis unit 211 can retain 97.5% salts substances, can be the useless of 6500mg/L by average TDS Water is concentrated to TDS more than 21600mg/L.After reverse osmosis unit 211 being pressed to handle in, 70% middle pressure reverse osmosis formed above of water inlet Water is produced thoroughly and enters recycle-water case 203 after second level reverse osmosis apparatus 201 and fresh water tanks 202, during remaining less than 30% is Press reverse osmosis concentrated water.Middle pressure reverse osmosis concentrated water enters 213 further desalination and concentration of high pressure reverse osmosis unit.High pressure reverse osmosis unit The material of 213 membrane components is aromatic polyamide composite material, and operating pressure is 3.5~4.5MPa.High pressure reverse osmosis unit 213 97.2% salts substances can be retained, the Waste water concentrating that average TDS is 21600mg/L can be more than 50000mg/L to TDS.Through After the processing of high pressure reverse osmosis unit 213,65% high pressure reverse osmosis produced water formed above of water inlet and through second level reverse osmosis apparatus 201 With after fresh water tanks 202 enter recycle-water case 203, remaining less than 35% be high pressure reverse osmosis concentrated water.

Preferably, high pressure reverse osmosis concentrated water enters the progress depth concentration of level-one electrically-driven ion film device 224.It supplies water Pressure is 0.20MPa.Level-one electrically-driven ion film device 224 can retain 96.2% salts substances, can be by average TDS The Waste water concentrating of 50000mg/L is more than 200000mg/L to TDS.After the processing of level-one electrically-driven ion film device 224, water inlet 75% level-one electric drive production water formed above simultaneously enters recycle-water case after second level reverse osmosis apparatus 201 and fresh water tanks 202 203, remaining less than 25%, which enters two level electrically-driven ion film device 226, further carries out depth concentration.Through two-stage electricity After ion-exchange membrane facility is driven to carry out depth concentration, more than the 95% of waste water can recycle, and less than the 5% of waste water concentrates Enter the second strong brine case 227 into high-salt concentrated water.

After the present invention carries out preliminary minimizing by middle pressure reverse osmosis unit 211 and high pressure reverse osmosis unit 213 to waste water Again depth concentration, entire technique are carried out through level-one electrically-driven ion film device 224 and two level electrically-driven ion film device 226 The yield of waste water is up to more than 95% in the process, and only 5% or so high-salt concentrated water needs to be evaporated crystallization processes, greatly The big energy consumption reduced needed for evaporation and crystal process, so as to reduce the processing cost of waste water.

Embodiment 4

By taking the evaporative crystallization technique of high-salt concentrated water as an example.

As shown in figure 4, the device of the evaporative crystallization technique of high-salt concentrated water includes at least feedstock preheater 301, nitre Evaporated crystallization device 302, nitre thickener 303, centrifugal separator 304, nitre mother liquor tank 305, the metering of the first baker 306, first Packing device 307, nitre mother liquor pump 308, freezing nitre crystallization apparatus 309, the first settler 310, freezing nitre centrifugal separator 311, Freezing nitre mother liquor tank 312, cold nitre mother liquor pump 313, heater 314, salt evaporated crystallization device 315, first gives birth to steam unit 316, Primary heater 317, the first vapour compression machine 318, cooling water system 319, refrigerator 320, cooler 321, vacuum system 322nd, nitre circulating pump 323, second give birth to steam unit 324, secondary heater 325, the second vapour compression machine 326, circulating pump 327, Second settler 328, salt centrifugal separator 329, the second baker 330, the second metering packing device 331, cold nitre circulating pump 332。

High-salt concentrated water in second strong brine case 227 enters feedstock preheater 301 through the 4th booster pump, preheated Enter nitre evaporated crystallization device 302 afterwards.Nitre evaporated crystallization device 302 is connected with vacuum system 322 so that nitre evaporated crystallization device Negative pressure or micro-positive pressure are kept in 302.302 and first vapour compression machine 318 of nitre evaporated crystallization device, primary heater 317 and original Expect that feed preheater 301 forms heating cycle system.Initial energy consumption is heated to be provided by the first life steam unit 316.Pass through nitre Circulating pump 323 connects primary heater 317 to be heated to nitre evaporated crystallization device 302.Later by the first vapour compression machine The low-temperature steam exhaust that 318 pairs of nitre evaporated crystallization devices 302 generate compresses, and passes through after primary heater 317 heats for original Expect the preheating of feed preheater 301.Nitre evaporated crystallization device persistently carries out water evaporation and concentration under negative pressure or slight positive pressure state, The temperature of high-salt concentrated water maintains 110 DEG C or so.Solidliquid mixture after evaporative crystallization enters through nitre thickener 303 to be centrifuged Seperator 304.The nitre mother liquor isolated enters nitre mother liquor tank 305, enters freezing nitre crystallization apparatus 309 by nitre mother liquor pump 308, It is adjusted after low temperature crystallization into the first settler 310.It freezes nitre crystallization apparatus 309 and connects cooler 321.Pass through cold nitre Circulating pump 332 makes freezing nitre crystallization apparatus 309 keep low temperature.It freezes nitre crystallization apparatus 309 and refrigerator is connected by cooler 321 320 and 319 circulating cooling of cooling water system, its internal mother liquor is made to reach -10~-5 DEG C.Cooling in first settler 310 Liquid centrifuges ten water nitre of generation and freezing nitre mother liquor by freezing nitre centrifugal separator 311.Ten water nitre again return to and through nitre The nitre liquid heat that evaporated crystallization device 302 generates through centrifugal separator 304 isolates nitre after melting mixing.The sodium sulphate isolated is through Enter the first metering packing device 307 after the drying of one baker 306.Freezing nitre mother liquor enters after freezing nitre mother liquor tank 312 through cold Nitre mother liquor pump 313 enters salt evaporated crystallization device 315.

The freezing chilled nitre mother liquor tank 312 of nitre mother liquor and freezing nitre mother liquor pump 313 are preheated into heater 314, with Enter salt evaporated crystallization device 315 afterwards.Salt evaporated crystallization device 315 is connected with vacuum system 322, so that salt evaporated crystallization device Negative pressure or micro-positive pressure are kept in 315.The initial heat that salt evaporated crystallization device 315 heats leads to from the second life steam unit 324 Secondary heater 325 is crossed to be heated.Salt evaporated crystallization device 315 connects secondary heater 325 by circulating pump 327 and salt is steamed Hair crystallization apparatus 315 is heated.315 and second vapour compression machine 326 of salt evaporated crystallization device, secondary heater 325 and add Hot device 314 forms heating cycle system.The low-temperature steam exhaust that salt evaporated crystallization device 315 generates is pressed through the second vapour compression machine 326 It contracts and the preheating of 314 internal liquid of heater is used for after being heated by secondary heater 325.Salt evaporated crystallization device 315 is in negative pressure Or under slight positive pressure state, water evaporation and concentration is persistently carried out.Product after salt evaporative crystallization is entered by the second settler 328 Salt centrifugal separator 329 is dried through second after device 330 is dried again enters the second metering packing device 331.Finally formed mixed salt accounts for The 5% of total salt amount after dehydration equipment is dehydrated hereinafter, carry out storage bay reason after being flashed to salt slurry.Meanwhile by evaporative crystallization Condensing hot air furnace in technique is to reuse water tank 203.

The Zero discharge treatment method of the present invention removes recycling high-quality water exceptionally, moreover it is possible to a variety of salinities are recycled, it not only can be substantially Degree reduces the quantity of final mixed salt, saving solidification disposal of waste expense, and the salinity purity recycled more than 96%, as Two level commodity salt export trade, can further reduce cost for wastewater treatment.On the other hand, skill is evaporated using the concentration of efficient depth and MVR Art substitutes multiple-effect evaporation, can save a large amount of energy consumptions, while the salt such as sodium sulphate, the sodium chloride in saline solution can be recycled, have Higher economic serviceability is the high slat-containing wastewater Zero-discharge treating process that a kind of enterprise affords to use.The present invention is also water resource The new road that a water resource recycles has been started in deficient area.

It should be noted that above-mentioned specific embodiment is exemplary, those skilled in the art can disclose in the present invention Various solutions are found out under the inspiration of content, and these solutions also belong to disclosure of the invention range and fall into this hair Within bright protection domain.It will be understood by those skilled in the art that description of the invention and its attached drawing are illustrative and are not Form limitations on claims.Protection scope of the present invention is limited by claim and its equivalent.

Claims (10)

1. a kind of Zero discharge treatment method of high slat-containing wastewater, the method includes the pretreating process of waste water, the decrements of waste water The evaporative crystallization technique of chemical industry skill and high-salt concentrated water, which is characterized in that

The reduction process of the waste water is to through pre- by middle pressure reverse osmosis unit (211) and high pressure reverse osmosis unit (213) Treated, and waste water carries out formation high pressure reverse osmosis concentrated water after preliminary minimizing processing, and the high pressure reverse osmosis concentrated water is again through level-one Height is condensed into after electrically-driven ion film device (224) and two level electrically-driven ion film device (226) progress depth concentration to contain Salt concentrated water, and the reduction process of the waste water also recycles production water during minimizing to reuse water tank (203)；

The level-one electrically-driven ion film device (224) and the two level electrically-driven ion film device (226) are including being arranged at intervals An anode and a cathode, regularly arranged by anode membrane, cavity block and baffle combination between the anode and the cathode Multiple films pair, the anode membrane and the cavity block are homogeneous membrane, are the uniform partition board of fluidised form, and the level-one electric drive between two films The power supply of ion-exchange membrane facility (224) and the two level electrically-driven ion film device (226) automatically switches high frequency using positive-negative polarity DC power supply, and utilize Digital Program Control power supply.

2. the Zero discharge treatment method of high slat-containing wastewater as described in claim 1, which is characterized in that the pre- place through the waste water High slat-containing wastewater is recycled by the reduction process of the waste water and the evaporative crystallization technique of the high-salt concentrated water after science and engineering skill In moisture and salt, so as to fulfill the zero-emission of waste water, wherein, the pretreating process of the waste water is flocculated by adding in And/or after precipitating medicament and the heavy metal ion in high slat-containing wastewater, hardness ions and organic substance being removed by chemical reactor The pH for adjusting waste water again is alkalinity.

3. the Zero discharge treatment method of high slat-containing wastewater as claimed in claim 2, which is characterized in that

The evaporative crystallization technique is in negative pressure or micro- by nitre evaporated crystallization device (302) and salt evaporated crystallization device (315) The salt in the high-salt concentrated water is separately recovered under positive pressure and forms commodity sodium sulphate and commodity sodium chloride；

Wherein, the evaporative crystallization technique of the high-salt concentrated water is completed as follows：

High-salt concentrated water in second strong brine case (227) is under negative pressure or micro-positive pressure by the nitre evaporated crystallization device (302) Be evaporated crystallization, after chilled nitre crystallization apparatus (309) freezing and crystallizing of nitre mother liquor that evaporative crystallization generates by freeze nitre from Centrifugal separator (311) centrifuges, and the ten water nitre return for centrifuging generation contains with what is generated through the nitre evaporated crystallization device (302) It is isolated after sodium sulphate and Gu nitre liquid heat is centrifuged machine (304) again after melting through being dried to obtain commodity sodium sulphate,

The freezing nitre mother liquor generated is centrifuged under negative pressure or micro-positive pressure through the salt by the freezing nitre centrifugal separator (311) Evaporated crystallization device (315) evaporative crystallization is isolated after sodium chloride and through being dried to obtain commodity sodium chloride.

4. the Zero discharge treatment method of the high slat-containing wastewater as described in one of claims 1 to 3, which is characterized in that the waste water Pretreating process complete as follows：

Highly dense pond (102) is sent into after waste water is carried out homogeneous and amount adjusting in regulating reservoir (101), passes through chemicals dosing plant (103) lime or sodium hydroxide, sodium carbonate, aluminium polychloride and polyacrylamide are sequentially added into the highly dense pond (102) And pass through chemical reactor and flocculated to waste water and/or precipitation process, the concentrated water generated after chemical reactor processing Enter the first intermediate pool (106), and will be in described first after tubular type microstrainer (104) and candle filter (105) filtering Between in pond (106) pH of waste water be adjusted to 8.0~9.5.

5. the Zero discharge treatment method of the high slat-containing wastewater as described in one of preceding claims, which is characterized in that described highly dense The sludge generated in the sludge and the tubular type microstrainer (104) that are generated in pond (102) is discharged into sludge-tank (107) and through dirt After mud dehydration device (108) carries out mud-water separation, the mud cake of generation carries out dewatered sludge disposition, and the water of generation enters the regulating reservoir (101) it mixes with untreated waste water to carry out circular treatment in.

6. the Zero discharge treatment method of the high slat-containing wastewater as described in one of preceding claims, which is characterized in that the waste water Minimizing treatment process complete as follows：

The waste water after pretreatment that first intermediate pool (106) is collected is carried out just by medium pressure reverse osmosis unit (211) Step minimizing processing forms middle pressure reverse osmosis concentrated water and is discharged into middle pressure concentrated water pond (212), what medium pressure concentrated water pond (212) was collected Middle pressure reverse osmosis concentrated water further carries out preliminary minimizing processing by the high pressure reverse osmosis unit (213) and forms high pressure reverse osmosis Saturating concentrated water is simultaneously discharged into high-pressure thick pond (214),

The middle pressure reverse osmosis produced water and height that medium pressure reverse osmosis unit (211) and the high pressure reverse osmosis unit (213) are formed Reverse osmosis produced water is pressed to enter recycle-water case (203) after second level reverse osmosis apparatus (201) and fresh water tanks (202).

7. the Zero discharge treatment method of the high slat-containing wastewater as described in one of preceding claims, which is characterized in that

High pressure reverse osmosis concentrated water in the high-pressure thick pond (214) is handled through active carbon filter (221) and resin container (222) After be discharged into the second intermediate pool (223) to carry out depth concentration, it is after pretreatment in second intermediate pool (223) The level-one electric drive film concentrated water that high pressure reverse osmosis concentrated water is formed after being handled by the level-one electrically-driven ion film device (224) is simultaneously The two level electrically-driven ion film device (226) is entered by the first strong brine case (225) and further carries out depth concentration, High-salt concentrated water is condensed into after the two level electrically-driven ion film device (226) is handled and enters the second strong brine case (227),

The level-one electric drive formed after being handled by the level-one electrically-driven ion film device (224) produces water through the two level reverse osmosis Saturating device (201) and the fresh water tanks (202) enter the reuse water tank (203) afterwards.

8. the Zero discharge treatment method of the high slat-containing wastewater as described in one of preceding claims, which is characterized in that

Waste water after pretreatment enters the first cartridge filter mistake by the first booster pump in first intermediate pool (106) Medium pressure reverse osmosis unit (211) is entered back into after filter, and security personnel's filter core of first cartridge filter is three layers Staged filter core, the size of three layers of staged filter core is respectively 10 μm, 15 μm and 20 μm；

Middle pressure reverse osmosis concentrated water in medium pressure concentrated water pond (212) is filtered by the second booster pump into the second cartridge filter After enter back into the high pressure reverse osmosis unit (213), and security personnel's filter core of second cartridge filter is three layers of rank Ladder type filter core, the size of three layers of staged filter core is respectively 5 μm, 10 μm and 15 μm；

High pressure reverse osmosis concentrated water after pretreatment enters third by third booster pump and protects in second intermediate pool (223) The level-one electrically-driven ion film device (224), and the guarantor of the third cartridge filter are entered back into after peace filter filtering Peace filter core is three layers of staged filter core, and the size of three layers of staged filter core is respectively 1 μm, 5 μm and 10 μm.

9. the Zero discharge treatment method of the high slat-containing wastewater as described in one of preceding claims, which is characterized in that the nitre steams After hair crystallization apparatus (302) evaporates the indirect steam generated by the first vapour compression machine (318) compression heating and boosting, and by The high-salt concentrated water that primary heater (317) is continuously after feedstock preheater (301) preheating provides thermal energy,

The indirect steam that the salt evaporated crystallization device (315) evaporation generates compressed by the second vapour compression machine (326) and by The heating of heater (314) inside cold nitre mother liquor is used for after secondary heater (325) raising temperature and pressure.

10. a kind of zero-discharge treatment system of high slat-containing wastewater, the system comprises the pretreating process of waste water, the decrements of waste water The evaporative crystallization technique of chemical industry skill and high-salt concentrated water, which is characterized in that

The reduction process of the waste water is to through pre- by middle pressure reverse osmosis unit (211) and high pressure reverse osmosis unit (213) Treated, and waste water carries out formation high pressure reverse osmosis concentrated water after preliminary minimizing processing, and the high pressure reverse osmosis concentrated water is again through level-one Height is condensed into after electrically-driven ion film device (224) and two level electrically-driven ion film device (226) progress depth concentration to contain Salt concentrated water, and the reduction process of the waste water also recycles production water during minimizing to reuse water tank (203)；

The level-one electrically-driven ion film device (224) and the two level electrically-driven ion film device (226) are including being arranged at intervals An anode and a cathode, regularly arranged by anode membrane, cavity block and baffle combination between the anode and the cathode Multiple films pair, the anode membrane and the cavity block are homogeneous membrane, are the uniform partition board of fluidised form, and the level-one electric drive between two films The power supply of ion-exchange membrane facility (224) and the two level electrically-driven ion film device (226) automatically switches high frequency using positive-negative polarity DC power supply, and utilize Digital Program Control power supply.