CN106630398A - Method for treating high-salt organic wastewater - Google Patents
Method for treating high-salt organic wastewater Download PDFInfo
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- CN106630398A CN106630398A CN201611095267.9A CN201611095267A CN106630398A CN 106630398 A CN106630398 A CN 106630398A CN 201611095267 A CN201611095267 A CN 201611095267A CN 106630398 A CN106630398 A CN 106630398A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/22—Purification
- C01D7/24—Crystallisation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a method for treating high-salt organic wastewater. According to the method, concentrated extracted salt is combined with biochemical treatment, and inorganic matters and organic matters are removed step by step, so that up-to-standard emission of the wastewater is realized. The method comprises the specific steps: adding a dehydrating agent into the wastewater which is heated to be 40 DEG C to 80 DEG C until the wastewater is saturated; cooling the saturated wastewater to be -5 DEG C to 5 DEG C; separating out mixed salt crystals; centrifuging and separating crystal separation wastewater to obtain the mixed salt crystals and a concentrated mother solution containing high organic matter content; washing the mixed salt crystals to obtain dehydrating agent hydrate crystals; evaporating a washing mother solution and carrying out concentration and salt extraction; heating the dehydrating agent hydrate crystals to be 95 DEG C to 150 DEG C; carrying out crystal transformation dehydration to obtain a regenerated dehydrating agent and condensed water; carrying out 3 to 5 times of the concentration and salt extraction on the concentrated mother solution containing the high organic matter content to obtain a salt-containing concentrated mother solution containing the high organic matter content; diluting the salt-containing concentrated mother solution containing the high organic matter content with the condensed water and carrying out the biochemical treatment to obtain up-to-standard wastewater. The method disclosed by the invention has moderate process conditions; the dehydrating agent can be circularly utilized; the energy consumption is low, the treatment cost is low and the emission standards of the wastewater are met.
Description
Technical field
The present invention relates to wastewater processing technology, more particularly, to the processing method of high salt organic waste water.
Background technology
With the fast development of national economy, the quality of life of people is improved, city domestic sewage, rural sewage
Also steeply rise with the discharge capacity of industrial wastewater, cause fresh water to receive different degrees of pollution, be badly in need of effective wastewater treatment
Method achieves qualified discharge.In the treatment of waste water high salt organic waste water be most difficult to process, by chemical industry, metallurgy, coking, dyestuff,
The high salt organic waste water that all conglomerate such as agricultural chemicals is produced, with complicated component, the spy such as organism kinds are various, inorganic salt content is high
Point.Mainly there are evaporation concentration method, biological treatment and burning method to the existing processing method of such industrial wastewater.
High salt organic waste water is heated to boiling point by evaporation concentration method, steams water, obtains the relatively low solid product of a large amount of purity,
Become solid waste.But, large amount of organic and inorganic matter are separated out and are pasted onto on evaporator inner wall, it is difficult to cleaned, and not only affect heat transfer
Efficiency, causes disposal ability significantly to decline, and also shortens the service life of production equipment.Meanwhile, the waste water for steaming still contains
The impurity such as organic matter, will also be processed by a set of conventional sewage processing meanss.Additionally, in evaporating concentration process, in waste water
Organic matter series reaction may occur, make waste component more complicated difficult to degrade.Therefore, evaporation concentration method has energy consumption
The shortcomings of height, high cost, poor processing effect, serious secondary pollution.
Biological treatment is that, using the method for wastewater treatment of microbial degradation organic matter, the microorganism of employing is typically only suitable for
In the water body of hyposaline, salinity is too high seriously to be suppressed growth of microorganism, and existing biological treatment is difficult to having high saliferous
Machine wastewater degradation.Using biological treatment, it is necessary to carry out after with a large amount of fresh water waste water is diluted, this is not only consumed in a large number
Freshwater resources, also add the discharge capacity of waste water.Therefore, biological treatment is difficult to directly process high salt organic waste water, bioanalysis
Before processing must carry out desalting processing, desalination high cost to salt-containing organic wastewater.
Burning method using the combustion adjuvant such as natural gas, fuel oil, coal in combustion furnace by organic wastewater individually or and other
Waste mixed combustion, can thoroughly be converted into carbon dioxide and water, energy consumption and processing cost with a step by organic matter in harmful waste water
It is higher.Using burning method process, inorganic salts can cause coking, slagging scorification, corrosion etc. to endanger to salt-containing organic wastewater in heating process
Evil, affects to burn stable operation.And, partial organic substances produce poisonous and harmful accessory substance in burning process, inevitably,
Cause secondary pollution.Therefore, burning method directly processes high salt organic waste water and has equipment investment big, and high energy consumption, processing cost are high
The shortcomings of.
In sum, the process of high salt organic waste water has suitable difficulty, is badly in need of a kind of high salt organic waste water of process
Method, to solve the problem of environmental pollution of such waste water.
The content of the invention
There is a problem of suitable difficulty for current high salt treatment of Organic Wastewater and lack effective treating method, the present invention is pushed away
Gone out a kind of method for processing high salt organic waste water, concentration salt extraction combined with biochemical treatment, substep remove inorganic salts with
Organic matter, realizes the qualified discharge of waste water.
The method of process salt-containing organic wastewater involved in the present invention, technical step includes：Plus dehydrating agent concentration, cooling knot
Crystalline substance, centrifugation, washing are separated, wash mother liquor salt extraction, a heating turn crystalline substance, dewatering slurries, mother liquor dilution and biochemical treatment.
S1, plus dehydrating agent concentration
The main component of analysis waste water, to choose be formed in aqueous under a kind of low temperature and take off under hydrate crystal, high temperature
Except the crystallization water, and with contained inorganic salts in waste water there are homo-ion inorganic salts to make dehydrating agent.Waste water is heated to into 40-80
DEG C, selected dehydrating agent is added into waste water, until waste water saturation, re-dissolved, does not obtain dehydrating agent saturation waste water.
Selected dehydrating agent can not occur chemical reaction with other compositions in addition to water in waste water, be sodium carbonate, magnesium carbonate,
One kind in magnesium chloride, calcium chloride, sodium sulphate, magnesium sulfate, zinc sulfate, disodium hydrogen phosphate, sodium dihydrogen phosphate.
Crystallization water mass fraction is than other optional dehydrating agent hydrate crystals in the hydrate crystal that selected dehydrating agent is formed
Middle crystallization water mass fraction is high.
S2, crystallisation by cooling
The dehydrating agent saturation waste water obtained in S1 plus dehydrating agent concentration is cooled to into -5～5 DEG C, mixing salt crystal is separated out, is obtained
To crystallization waste water.The mixing salt crystal of precipitation includes the common dehydrating agent hydrate crystal for separating out and other inorganic salt crystals.
S3, centrifugation
Crystallization waste water after S2 crystallisation by cooling is centrifuged, obtains mixing salt crystal (dehydrating agent hydrate crystal
With other inorganic salt crystals) and organic pollutant enrichment high organic matter concentrated mother liquor.
Again high organic matter concentrated mother liquor is carried out into operation process by S1, S2, S3 step, repetitive cycling is operated 3-5 time, carried out
Desalination, obtains the high organic matter concentrated mother liquor of saliferous.
S4, washing are separated
The mixing salt crystal that S3 is centrifugally separating to obtain is washed using the low temperature saturated solution of dehydrating agent, and centrifugation is obtained
Dehydrating agent hydrate crystal and washing mother liquor.Using dehydrating agent low temperature saturated solution prepared by added dehydrating agent in S1 steps,
1～3 washing is carried out at -5～5 DEG C to mixing salt crystal.
S5, washing mother liquor salt extraction
S4 is washed into isolated washing mother liquor and is heated to 90-130 DEG C, be evaporated concentration, be centrifugally separating to obtain back
Receive dehydrating agent and inorganic salts.
S6, heating turn crystalline substance
S4 is washed the dehydrating agent hydrate crystal heating obtained in separating and turns crystalline substance, take off the crystallization water, obtain dehydrating agent slurries.
It is 95～150 DEG C to turn brilliant temperature.
S7, dewatering slurries
The dehydrating agent slurries that S6 heating turns to be obtained in crystalline substance are heated to into boiling point, dehydration, and the solid to obtaining is evaporated
It is centrifuged, obtains regenerating dehydrating agent and condensed water.The regeneration dehydrating agent for obtaining is added in untreated waste water, is carried out
Recycle.The evaporimeter for being adopted is MVR evaporimeters.
S8, mother liquor dilution
By the high organic matter concentrated mother liquor of the saliferous obtained Jing after S1-S2-S3 circulation steps carry out 3-5 time, with S7 step pairs
The condensed water of product is diluted, and obtains diluting mother liquor.
S9, biochemical treatment
The dilution mother liquor obtained in S8 is carried out into biochemical treatment, waste water up to standard is obtained.
Beneficial effects of the present invention：
1st, the characteristic that can form hydrate crystal is crystallized in water using dehydrating agent, dehydrating agent is added, by dehydrating agent water
The part free water that the precipitation of solvate crystal is taken out of in waste water, relatively conventional evaporation concentration method, thickening temperature is low, process conditions
Gently, the shortcoming of direct high temperature evaporation is overcome, energy consumption is low, low cost.
2nd, the granularity of dehydrating agent hydrate crystal is larger, and crystal habit is good, is difficult to be mingled with impurity in forming process, and purity is very
It is high.The dehydrating agent slurries obtained after hydrate crystal heating are evaporated and obtain regenerating dehydrating agent and condensed water, regenerate dehydrating agent
Reusable edible carries out the concentration of waste water, and the purity of condensed water is very high, is substantially free of salt and organic matter.
3rd, the high organic matter concentrated mother liquor of saliferous is diluted using condensed water, the dilution mother liquor for obtaining passes through at biochemistry
Reason, without the need for external adding water during being somebody's turn to do, more traditional high load wastewater treatment technique greatly reduces the consumption of external adding water, reduces place
Reason cost, processes the waste water for obtaining and reaches discharge standard.
4th, dehydrating agent slurries dehydration by evaporation adopts MVR vaporising devices, and energy consumption is low, and operating cost is low.
5th, dehydrating agent hydrate crystal dehydration turn crystalline substance obtain regenerate dehydrating agent can be recycled, input cost is low.
Description of the drawings
Fig. 1 is a kind of schematic flow sheet of the method for processing high salt organic waste water.
Description of symbols in figure：
S1- adds dehydrating agent to concentrate S2- crystallisation by cooling
S3- centrifugations S4- washings are separated
S5- washing mother liquor salt extraction S6- heating turns crystalline substance
S7- dewatering slurries S8- mother liquors dilute
S9- biochemical treatments
Specific embodiment
Technical scheme is described further by embodiment.
Embodiment 1：The high method of wastewater treatment of organic matter and sodium chloride content：
In the 1t waste water of production casing discharge, containing 80kg sodium chloride, content of organics is 100kg.
Salt extraction is concentrated for the first time：Waste water is heated to into 65 DEG C, sodium carbonate 276kg is added in water to waste water saturation；Cooling
- 5 DEG C are cooled to, washing soda crystal 680kg and sodium chloride crystal 72kg is separated out；Crystallization waste water is centrifuged, is obtained
To mixed salt crystal and high organic matter concentrated mother liquor 492kg (containing 24kg sodium carbonate, 8kg sodium chloride)；With 2 DEG C of sodium carbonate saturation
The aqueous solution is washed as washing lotion to mixed salt crystal, and the sodium chloride in crystal is dissolved in washing mother liquor, obtains ten water carbon
Sour sodium crystal and washing mother liquor；Washing mother liquor is heated to into 95 DEG C, concentration is evaporated, sodium chloride 8kg is centrifugally separating to obtain, it is cold
But washing mother liquor can be recycled as washing lotion；Washing soda crystal is heated to into 100 DEG C, dehydration turns crystalline substance and becomes sodium carbonate slurry
Liquid；Sodium carbonate slurries are squeezed in MVR evaporimeters, is evaporated, be centrifuged, obtain regenerating sodium carbonate solid 252kg, steamed
Send out the condensed water 428kg for obtaining.
Second concentration salt extraction：The high organic matter concentrated mother liquor that first time concentration salt extraction is obtained is heated to into 65 DEG C, Xiang Shui
It is middle to add regeneration sodium carbonate 150kg to waste water saturation；Cooling down separates out washing soda crystal 379kg and chlorination to -5 DEG C
Sodium crystal 4.5kg；Crystallization waste water is centrifuged, mixed salt crystal is obtained and high organic matter concentrated mother liquor 253kg (is contained
9.9kg sodium carbonate, 3.5kg sodium chloride)；With 2 DEG C of carbonic acid saturated aqueous solution of sodium as washing lotion, mixed salt crystal is washed,
Sodium chloride in crystal is dissolved in washing mother liquor, washing soda crystal and washing mother liquor is obtained；Will washing mother liquor heating
To 95 DEG C, concentration is evaporated, is centrifugally separating to obtain sodium chloride 3.5kg, the washing mother liquor of cooling can be recycled as washing lotion；Will
Washing soda crystal is heated to 100 DEG C, and dehydration turns crystalline substance becomes sodium carbonate slurries；Sodium carbonate slurries are squeezed in MVR evaporimeters,
It is evaporated, is centrifuged, obtain regenerating sodium carbonate solid 140kg, evaporates the condensed water 238.5kg for obtaining.
Third time concentration salt extraction：The high organic matter concentrated mother liquor that for the second time concentration salt extraction is obtained is heated to into 65 DEG C, Xiang Shui
It is middle to add regeneration sodium carbonate 57.6kg to waste water saturation；Cooling down separates out washing soda crystal 142.5kg and chlorine to -5 DEG C
Change sodium crystal 3.3kg；Crystallization waste water is centrifuged, mixed salt crystal is obtained and high organic matter concentrated mother liquor 163.6kg (is contained
There are 4.8kg sodium carbonate, 0.2kg sodium chloride)；With 2 DEG C of carbonic acid saturated aqueous solution of sodium as washing lotion, mixed salt crystal is washed
Wash, the sodium chloride in crystal is dissolved in washing mother liquor, obtain washing soda crystal and washing mother liquor；Washing mother liquor is added
Heat is evaporated concentration to 95 DEG C, is centrifugally separating to obtain sodium chloride 0.2kg, and the washing mother liquor of cooling can be recycled as washing lotion；
Washing soda crystal is heated to into 100 DEG C, dehydration turns crystalline substance becomes sodium carbonate slurries；Sodium carbonate slurries are squeezed into into MVR evaporimeters
In, it is evaporated, it is centrifuged, obtain regenerating sodium carbonate solid 52.8kg, evaporate the condensed water 89kg for obtaining.
4th concentration salt extraction：The high organic matter concentrated mother liquor that third time concentration salt extraction is obtained is heated to into 65 DEG C, Xiang Shui
It is middle to add regeneration sodium carbonate 27kg to waste water saturation；Cooling down separates out washing soda crystal 68.8kg and chlorination to -5 DEG C
Sodium crystal 0.1kg；Crystallization waste water is centrifuged, mixed salt crystal is obtained and high organic matter concentrated mother liquor 120.3kg (is contained
1.4kg sodium carbonate, 0.1kg sodium chloride), with 2 DEG C of carbonic acid saturated aqueous solution of sodium as washing lotion, mixed salt crystal is washed,
Sodium chloride in crystal is dissolved in washing mother liquor, washing soda crystal and washing mother liquor is obtained；Will washing mother liquor heating
To 95 DEG C, concentration is evaporated, is centrifugally separating to obtain sodium chloride 0.1kg, the washing mother liquor of cooling can be recycled as washing lotion；Will
Washing soda crystal is heated to 100 DEG C, and dehydration turns crystalline substance becomes sodium carbonate slurries；Sodium carbonate slurries are squeezed in MVR evaporimeters,
It is evaporated, is centrifuged, obtain regenerating sodium carbonate solid 25.5kg, evaporates the condensed water 43kg for obtaining.
5th concentration salt extraction：The 4th concentration high organic matter concentrated mother liquor that obtain of salt extraction is heated to into 65 DEG C, Xiang Shui
Middle sodium carbonate 8.5kg is to waste water saturation；Cooling down separates out washing soda crystal 21.58kg and sodium chloride crystal to -5 DEG C
0.05kg；Crystallization waste water is centrifuged, mixed salt crystal is obtained and high organic matter concentrated mother liquor 106.7kg (is contained
0.47kg sodium carbonate, 0.05kg sodium chloride), the wherein high organic wastewater of the more untreated high salt of salt total content is substantially reduced, and is claimed
For the high organic matter concentrated mother liquor of saliferous；With 2 DEG C of carbonic acid saturated aqueous solution of sodium as washing lotion, mixed salt crystal is washed, will
Sodium chloride in crystal is dissolved in washing mother liquor, obtains washing soda crystal and washing mother liquor；Washing mother liquor is heated to
95 DEG C, concentration is evaporated, is centrifugally separating to obtain sodium chloride 0.05kg, the washing mother liquor of cooling can be recycled as washing lotion；Will
Washing soda crystal is heated to 100 DEG C, and dehydration turns crystalline substance becomes sodium carbonate slurries, and sodium carbonate slurries are squeezed in MVR evaporimeters,
It is evaporated, is centrifuged, obtain regenerating sodium carbonate solid 8kg, evaporates the condensed water 13.2kg for obtaining.
The condensed water mixing that five concentration salt extraction processes of the above are obtained, water purity is higher than 99%, and these condensed waters are added
Concentrate in the high organic matter concentrated mother liquor of saliferous that salt extraction is obtained for 5th time, be diluted, obtain diluting mother liquor；Dilution mother liquor is entered
Row biochemical treatment, dilution mother liquor is passed through regulating reservoir, adds cultured Halophiles in advance to be carried out a biological disposal upon after pretreatment,
Obtain waste water up to standard.
Embodiment 2：The high method of wastewater treatment of organic matter and content of magnesium chloride：
The waste water 1.5t of production dyestuff discharge, wherein containing 60kg magnesium chlorides, hardly degraded organic substance content is 120kg.
Salt extraction is concentrated for the first time：Waste water is heated to into 60 DEG C, adds 543kg magnesium sulfate monohydrates solid full to waste water in water
With；Cooling down separates out epsom salt crystal 964.4kg and magnesium chloride hexahydrate 72.5kg to -5 DEG C；Crystallization waste water is carried out
Centrifugation, obtains mixed salt crystal and high organic matter concentrated mother liquor 1016.6kg (containing 1.74kg magnesium sulfate, 26kg magnesium chlorides)；
With 3 DEG C of magnesium sulfate saturated aqueous solutions as washing lotion, mixed salt crystal is washed, the magnesium chloride in crystal is dissolved into into washing
In mother liquor, epsom salt crystal and washing mother liquor are obtained；Washing mother liquor is heated to into 100 DEG C, concentration, centrifugation point is evaporated
From magnesium chloride 26kg is obtained, the washing mother liquor of cooling can be recycled as washing lotion；Epsom salt crystal is heated to into 150 DEG C,
Dehydration turns crystalline substance becomes magnesium sulfate slurries；Magnesium sulfate slurries are squeezed in MVR evaporimeters, is evaporated, be centrifuged, obtained again
Raw magnesium sulfate monohydrate solid 541kg, evaporates the condensed water 423kg for obtaining.
Second concentration salt extraction：The high organic matter concentrated mother liquor that for the first time concentration salt extraction is obtained is heated to 60 DEG C, thereto
498kg is added to regenerate magnesium sulfate monohydrate solid to waste water saturation；Cooling down separates out epsom salt crystal 885kg to -5 DEG C
With magnesium chloride hexahydrate 34kg；Crystallization waste water is centrifuged, mixed salt crystal and high organic matter concentrated mother liquor 628kg is obtained
(containing 1.35kg magnesium sulfate, 10kg magnesium chlorides)；With 3 DEG C of magnesium sulfate saturated aqueous solutions as washing lotion, mixed salt crystal is carried out
Washing, the magnesium chloride in crystal is dissolved in washing mother liquor, obtains epsom salt crystal and washing mother liquor；Mother liquor will be washed
100 DEG C are heated to, concentration is evaporated, magnesium chloride 10kg is centrifugally separating to obtain, the washing mother liquor of cooling can be sharp again as washing lotion
With；Epsom salt crystal is heated to into 150 DEG C, dehydration turns crystalline substance becomes magnesium sulfate slurries；Magnesium sulfate slurries are squeezed into into MVR evaporations
In device, it is evaporated, is centrifuged, obtain regenerating magnesium sulfate monohydrate solid 496.4kg, evaporates the condensed water for obtaining
388.5kg。
Third time concentration salt extraction：The high organic matter concentrated mother liquor that for the second time concentration salt extraction is obtained is heated to 60 DEG C, thereto
311kg is added to regenerate magnesium sulfate monohydrate solid to waste water saturation；Cooling down separates out epsom salt crystal to -5 DEG C
552.4kg with magnesium chloride hexahydrate 14.8kg；Crystallization waste water is centrifuged, mixed salt crystal is obtained and the concentration of high organic matter is female
Liquid 385kg (containing 0.98kg magnesium sulfate, 3kg magnesium chlorides)；It is brilliant to mixed salt with 3 DEG C of magnesium sulfate saturated aqueous solutions as washing lotion
Body is washed, and the magnesium chloride in crystal is dissolved in washing mother liquor, obtains epsom salt crystal and washing mother liquor；To wash
Wash mother liquor and be heated to 100 DEG C, be evaporated concentration, be centrifugally separating to obtain magnesium chloride 3kg, the washing mother liquor of cooling can be used as washing lotion
Recycle；Epsom salt crystal is heated to into 150 DEG C, dehydration turns crystalline substance becomes magnesium sulfate slurries；Magnesium sulfate slurries are squeezed into into MVR
In evaporimeter, it is evaporated, is centrifuged, obtain regenerating magnesium sulfate monohydrate solid 309kg, evaporates the condensed water for obtaining
242.5kg。
4th concentration salt extraction：The high organic matter concentrated mother liquor that third time concentration salt extraction is obtained is heated to 60 DEG C, thereto
109kg is added to regenerate magnesium sulfate monohydrate solid to waste water saturation；Cooling down separates out epsom salt crystal to -5 DEG C
193.2kg with magnesium chloride hexahydrate 4.6kg；Crystallization waste water is centrifuged, mixed salt crystal is obtained and the concentration of high organic matter is female
Liquid 300kg (containing 0.5kg magnesium sulfate, 0.9kg magnesium chlorides), wherein salt total content is big compared with the high organic wastewater of untreated high salt
Big reduction, the referred to as high organic matter concentrated mother liquor of saliferous；With 3 DEG C of magnesium sulfate saturated aqueous solutions as washing lotion, mixed salt crystal is entered
Row washing, the magnesium chloride in crystal is dissolved in washing mother liquor, obtains epsom salt crystal and washing mother liquor；Will washing mother
Liquid is heated to 100 DEG C, is evaporated concentration, is centrifugally separating to obtain magnesium chloride 0.9kg, and the washing mother liquor of cooling can be as washing lotion again
Utilize；Epsom salt crystal is heated to into 150 DEG C, dehydration turns crystalline substance becomes magnesium sulfate slurries；Magnesium sulfate slurries are squeezed into into MVR to steam
In sending out device, it is evaporated, is centrifuged, obtain regenerating magnesium sulfate monohydrate solid 108kg, evaporates the condensed water 84kg for obtaining.
The condensed water mixing that four concentration salt extraction processes of the above are obtained, water purity is higher than 99.5%, and these condensed waters are added
Enter the 4th time to concentrate in the high organic matter concentrated mother liquor of saliferous that salt extraction is obtained, be diluted, obtain diluting mother liquor；Mother liquor will be diluted
Biochemical treatment is carried out, dilution mother liquor is passed through regulating reservoir, add cultured Halophiles in advance to carry out biological place after pretreatment
Reason, obtains waste water up to standard.
Claims (7)
1. a kind of method for processing high salt organic waste water, it is characterised in that technical step includes：Plus dehydrating agent concentration (S1), cold
But crystallization (S2), centrifugation (S3), washing separates (S4), washing mother liquor salt extraction (S5), heating turn brilliant (S6), dewatering slurries
(S7), mother liquor dilution (S8) and biochemical treatment (S9)；
Described plus dehydrating agent concentration (S1)：Waste water is heated to into 40-80 DEG C, into waste water dehydrating agent is added, until waste water saturation,
Obtain dehydrating agent saturation waste water；
Selected dehydrating agent is can to form hydrate crystal under a kind of low temperature in aqueous, the Removal under High Temperature crystallization water, and with
Inorganic salts in waste water have a homo-ion inorganic salts, and selected dehydrating agent can not occur with other compositions in addition to water in waste water
Chemical reaction；
The crystallisation by cooling (S2)：The dehydrating agent saturation waste water obtained in dehydrating agent concentration (S1) will be added to be cooled to -5～5 DEG C, analysis
Go out to mix salt crystal, obtain crystallization waste water；
The centrifugation (S3)：The crystallization waste water that crystallisation by cooling (S2) is obtained is centrifuged, obtains mixing salt crystal
With the high organic matter concentrated mother liquor of organic pollutant enrichment；
The washing separates (S4)：The mixing salt crystal that centrifugation (S3) is obtained is washed using the low temperature saturated solution of dehydrating agent
Wash, centrifugation, obtain dehydrating agent hydrate crystal and washing mother liquor；
Washing mother liquor salt extraction (S5)：The washing mother liquor that washing separation (S4) is obtained is heated to into 90-130 DEG C, is evaporated
Concentration, centrifugation is recycled dehydrating agent and inorganic salts；
The heating turns brilliant (S6)：Washing is separated into the dehydrating agent hydrate crystal heating turn crystalline substance that (S4) is obtained, the crystallization water is taken off, is obtained
To dehydrating agent slurries, it is 95～150 DEG C to turn brilliant temperature；
The dewatering slurries (S7)：The dehydrating agent slurries that heating turn brilliant (S6) is obtained are heated to into boiling point, dehydration is evaporated, and
Solid to obtaining is centrifuged, and obtains regenerating dehydrating agent and condensed water；
The mother liquor dilutes (S8)：The high organic matter concentration of the saliferous obtained Jing after S1-S2-S3 circulation steps carry out 3-5 time is female
Liquid, is diluted with the condensed water of dewatering slurries (S7) by-product, obtains diluting mother liquor；
The biochemical treatment (S9)：The dilution mother liquor that mother liquor dilution (S8) is obtained carries out biochemical treatment, obtains waste water up to standard.
2. a kind of method for processing high salt organic waste water according to claim 1, it is characterised in that described plus dehydrating agent is dense
The dehydrating agent added into waste water in contracting (S1) is sodium carbonate, magnesium carbonate, magnesium chloride, calcium chloride, sodium sulphate, magnesium sulfate, sulfuric acid
One kind in zinc, disodium hydrogen phosphate, sodium dihydrogen phosphate.
3. a kind of method for processing high salt organic waste water according to claim 2, it is characterised in that it is described into waste water plus
Crystallization water mass fraction in other optional dehydrating agent hydrate crystals than crystallizing in the hydrate crystal that the dehydrating agent for entering is formed
Water quality fraction is high.
4. a kind of method for processing high salt organic waste water according to claim 1, it is characterised in that the washing is separated
(S4) the dehydrating agent low temperature saturated solution for being adopted by plus dehydrating agent concentration (S1) in added dehydrating agent prepare, at -5～5 DEG C
1～3 washing is carried out to mixing salt crystal.
5. a kind of method for processing high salt organic waste water according to claim 1, it is characterised in that the heating turns crystalline substance
(S6) temperature is higher than its dehydration temperaturre 5～10 DEG C.
6. a kind of method for processing high salt organic waste water according to claim 1, it is characterised in that the dewatering slurries
(S7) in, the regeneration dehydrating agent for obtaining is added in untreated waste water, is circulated utilization.
7. a kind of method for processing high salt organic waste water according to claim 1, it is characterised in that the dewatering slurries
(S7) in, the evaporimeter for being adopted is MVR evaporimeters.
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