CN104692575A - Crystallization treatment method and device of high salt wastewater - Google Patents
Crystallization treatment method and device of high salt wastewater Download PDFInfo
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- CN104692575A CN104692575A CN201410796519.5A CN201410796519A CN104692575A CN 104692575 A CN104692575 A CN 104692575A CN 201410796519 A CN201410796519 A CN 201410796519A CN 104692575 A CN104692575 A CN 104692575A
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Abstract
The invention relates to a crystallization treatment method and device of high salt wastewater and belongs to the technical field of water treatment. The method is characterized in that after sodium sulfate concentrated water is treated by a freezing crystallization system, generated mother liquor A enters into an MVR system for evaporative crystallization; after sodium chloride concentrated water is treated by the MVR system, generated mother liquor B enters into a freezing crystallization system for freezing crystallization, and the mother liquor can be treated in a circulation overlapping manner; a drain outlet of the MVR system of the device is connected with a liquid inlet of a crystallization tank in the freezing crystallization system through a pipeline and the drain outlet of the freezing crystallization system is connected with a liquid inlet pipe of the MVR evaporative crystallization system. The method has the advantages that the mother liquor is treated by a freezing crystallization technology and an MVR evaporation crystallization technology in a circulation overlapping manner, so that the problems of zero emission and resource utilization are solved, and therefore, the energy consumption is effectively reduced and the operating cost is lowered.
Description
Technical field
The invention belongs to water-treatment technology field, specifically a kind of method of freezing and crystallizing and MVR evaporative crystallization recycling cross process mother liquor and device thereof.
Background technology
Freezing and crystallizing technology is, by freezing method, wastewater temperature is down to about 0 DEG C, and the principle large according to the susceptibility of solubleness to temperature of some compound in water, carries out a kind of technology of crystallization treatment to waste water.The centrifuge mother liquor of freezing and crystallizing technology is only to carry out component loops in freezing and crystallizing system, because unconspicuous material may be changed containing some solubility with temperature in water, if adopt mother liquor all to circulate, these materials can be caused in intrasystem enrichment, form endless loop, so a part of centrifuge mother liquor needs to discharge from system.
MVR technology be by the method for evaporation by the temperature increase of waste water to the boiling temperature of water, by the evaporation to moisture in waste water, a kind of technology that in the waste water made, material is separated out from waste water.The centrifuge mother liquor of MVR technology can realize whole circulations in theory in system, but because the ion component contained in waste water is complicated, it is not one-component, as fruit mother liquor all circulates, the crystal salt magazine of final generation is too much, and use value is almost nil, and energy consumption is an important factor of restriction evaporation technique cost always in addition, mother liquor takes whole circular treatment greatly can increase the energy consumption of system, increases running cost.
Summary of the invention
The object of the invention is to overcome weak point of the prior art, a kind of crystallizing treatment process and device thereof of high slat-containing wastewater is provided.
In order to realize object of the present invention, following for employing technical scheme is implemented by we:
A kind of deep treatment method of high slat-containing wastewater, handled former water is the dense water of sodium-chlor and the dense water of sodium sulfate of high slat-containing wastewater gained after Chemical Pretreatment, Using Multistage Membranes concentration and the process of high-pressure membrane concentration systems, it is characterized in that: the dense water of sodium sulfate is after the process of freezing and crystallizing system, output technical grade saltcake and mother liquor A, the mother liquor A produced needs to discharge from system, and the mother liquor A of discharge enters MVR system and carries out evaporative crystallization;
The dense water of sodium-chlor is after the process of MVR system, and output industrial crystallization salt and mother liquor B, the mother liquor B of generation needs to discharge from system, and the mother liquor B of discharge enters freezing and crystallizing system and carries out freezing and crystallizing.
Further, described mother liquor A or mother liquor B enters after MVR system or freezing and crystallizing system carry out evaporative crystallization or Freeze crystallization, obtain mother liquor B or mother liquor A, mother liquor B or mother liquor A enters again freezing and crystallizing system or MVR system carries out freezing and crystallizing or evaporative crystallization process, moves in circles.
Further, described mother liquor A together enters MVR system after mixing with the dense water of described sodium-chlor and carries out evaporative crystallization process.
Further, described cycle index at least three times.
A kind of crystallization treatment device of high slat-containing wastewater, comprise: MVR system and freezing and crystallizing system, described MVR system adopts two sections of serial plate type heat exchangers to carry out thermal pretreatment to the sodium-chlor strong brine that liquid-inlet pipe is come in, after preheating, material enters Falling film heat transfer device, heat exchange is carried out with the steam heated up after compression, then material and steam enter falling film separator and carry out gas-liquid separation, after being separated, liquid enters pump circulation interchanger increasing temperature and pressure, then in crystal separator, carry out flash distillation, separate out small-particle crystal, separate out crystal by crystal separator bottom discharging to centrifugal separating device, crystal packing after centrifugal, a part of mother liquor B after separation returns system and proceeds evaporation concentration after heating, part mother liquor B is by outside leakage fluid dram discharge system, described freezing and crystallizing system dense for sodium sulfate water is first delivered to pre-cooler from the dense water tank of sodium sulfate tentatively lower the temperature, the dense water of sodium sulfate after cooling enters the circulation feed liquid pipeline of crystallisation by cooling system, after mixing with circulation feed liquid and water cooler carry out heat exchange, cooled supersaturation feed liquid enters crystallizer, enter bottom crystallisation chamber via crystallizer internal flow, contact with crystal grain crystalline growth step by step class settling discharge carry out centrifugation to centrifugal separating device, crystal packing after centrifugal, a part of mother liquor A after separation and crystallizer upper strata feed liquid enter again circulating line further water dense with sodium sulfate mix, cooling, be circulated back to crystallisation chamber and again participate in crystallization, circulation like this continuous seepage crystalline product, part mother liquor A is by outside leakage fluid dram discharge system, it is characterized in that: the leakage fluid dram of the centrifugal separating device in described MVR system is connected with a fluid inlet of the crystallizer in freezing and crystallizing system by pipeline, the leakage fluid dram of the centrifugal separating device in described freezing and crystallizing system is connected by the liquid-inlet pipe of pipeline with MVR system.
Beneficial effect
Unconspicuous material may be changed containing some solubility with temperature in the mother liquor of freezing and crystallizing technology, if adopt mother liquor all to circulate, these materials can be caused in intrasystem enrichment, form endless loop, so a part of centrifuge mother liquor needs to discharge from system.
The mother liquor of MVR technology can realize whole circulations in theory in system, but because the ion component contained in waste water is complicated, it is not one-component, as fruit mother liquor all circulates, the crystal salt magazine of final generation is too much, and use value is almost nil, and energy consumption is an important factor of restriction evaporation technique cost always in addition, mother liquor takes whole circular treatment greatly can increase the energy consumption of system, increases running cost.
In sum, the method for freezing and crystallizing technology and MVR technology recycling cross process mother liquor and device thereof, can address these problems effectively.
Accompanying drawing explanation
Fig. 1 is skeleton diagram of the present invention;
Fig. 2 is process flow sheet of the present invention.
Embodiment
By reference to the accompanying drawings the present invention is described further:
As depicted in figs. 1 and 2, Yuan Shuiwei industrial park brine waste handled by present method is through Using Multistage Membranes concentration, the main water containing sodium-chlor obtained after membrane sepn and the water containing sodium sulfate, these two strands of water are eventually through the main dense water containing sodium-chlor of gained after the process of high-pressure membrane concentration systems and the dense water (hereinafter referred to as the dense water of sodium-chlor, the dense water of sodium sulfate) containing sodium sulfate.The dense water TDS of sodium-chlor is more than 140,000, the dense water TDS of sodium sulfate more than 180,000, the dense water of sodium sulfate after the process of freezing and crystallizing system, output technical grade saltcake and mother liquor A, the mother liquor A produced needs to discharge from system, and the mother liquor A of discharge enters MVR system and carries out evaporative crystallization; The dense water of sodium-chlor after the process of MVR system, output industrial crystallization salt and mother liquor B, the mother liquor B of generation needs to discharge from system, and the mother liquor B of discharge enters freezing and crystallizing system and carries out freezing and crystallizing; Described mother liquor A or mother liquor B enters after MVR system or freezing and crystallizing system carry out evaporative crystallization or Freeze crystallization, obtain mother liquor B or mother liquor A, described mother liquor A or mother liquor B together enters MVR system after mixing with the dense water of described sodium-chlor or the dense water of sodium sulfate or freezing and crystallizing system carries out evaporative crystallization or Freeze crystallization, moves in circles.
This method analysis is learnt, freezing and crystallizing saltcake MVR out evaporative crystallization to obtain the purity of sodium-chlor all very high.Concrete calculating sees the following form, and as seen after third time circulation, the salt amount that goes out of freezing and crystallizing and MVR keeps relative constancy.
Embodiment:
The mother liquor A of freezing and crystallizing is after the repeatedly circulation of refrigeration system, and in the mother liquor A of discharge, the content of sodium-chlor is high, and this can be connected by the liquid-inlet pipe of pipeline with MVR system, and such mother liquor A together enters MVR system after just can mixing with the dense water of sodium-chlor, MVR system principle is exactly by the boiling point of temperature increase to water, is evaporated by water from system, because saturated solution principle, crystal salt can be separated out from system, MVR salt slurry out can produce centrifuge mother liquor B by high speed centrifugation, centrifuge mother liquor B now needs to discharge from system, and the centrifuge mother liquor B discharged enters freezing and crystallizing system again by the pipeline be connected with the fluid inlet of the crystallizer in freezing and crystallizing system, mother liquor B is after the process of freezing and crystallizing system, obtain the mother liquor A of freezing and crystallizing, the mother liquor A of freezing and crystallizing is after the repeatedly circulation of freezing and crystallizing system, in the mother liquor A discharged, the content of sodium-chlor is high, by the pipeline be connected with the liquid-inlet pipe of MVR system, water dense with sodium-chlor together enters MVR system after mixing and processes again, go round and begin again, move in circles and process.
Claims (5)
1. the crystallizing treatment process of a high slat-containing wastewater, handled former water is the dense water of sodium-chlor and the dense water of sodium sulfate of high slat-containing wastewater gained after Chemical Pretreatment, Using Multistage Membranes concentration and the process of high-pressure membrane concentration systems, it is characterized in that: the dense water of sodium sulfate is after the process of freezing and crystallizing system, output technical grade saltcake and mother liquor A, the mother liquor A produced needs to discharge from system, and the mother liquor A of discharge accesses MVR system and carries out evaporative crystallization;
The dense water of sodium-chlor is after the process of MVR system, and output industrial crystallization salt and mother liquor B, the mother liquor B of generation needs to discharge from system, and the mother liquor B of discharge enters freezing and crystallizing system and carries out freezing and crystallizing.
2. the crystallizing treatment process of a kind of high slat-containing wastewater according to claim 1, it is characterized in that: after described mother liquor A or mother liquor B access MVR system or freezing and crystallizing system carry out evaporative crystallization or Freeze crystallization, obtain mother liquor B or mother liquor A, mother liquor B or mother liquor A enters again freezing and crystallizing system or MVR system carries out freezing and crystallizing or evaporative crystallization process, moves in circles.
3. the crystallizing treatment process of a kind of high slat-containing wastewater according to claim 1 and 2, is characterized in that: described mother liquor A together enters MVR system after mixing with the dense water of described sodium-chlor and carries out evaporative crystallization process.
4. the crystallizing treatment process of a kind of high slat-containing wastewater according to claim 2, is characterized in that: described cycle index at least three times.
5. the crystallization treatment device of a high slat-containing wastewater, comprise: MVR system and freezing and crystallizing system, described MVR system adopts two sections of serial plate type heat exchangers to carry out thermal pretreatment to the sodium-chlor strong brine that liquid-inlet pipe is come in, after preheating, material enters Falling film heat transfer device, heat exchange is carried out with the steam heated up after compression, then material and steam enter falling film separator and carry out gas-liquid separation, after being separated, liquid enters pump circulation interchanger increasing temperature and pressure, then in crystal separator, carry out flash distillation, separate out small-particle crystal, separate out crystal by crystal separator bottom discharging to centrifugal separating device, crystal packing after centrifugal, a part of mother liquor B after separation returns system and proceeds evaporation concentration after heating, part mother liquor B is by outside leakage fluid dram discharge system, described freezing and crystallizing system dense for sodium sulfate water is first delivered to pre-cooler from the dense water tank of sodium sulfate tentatively lower the temperature, the dense water of sodium sulfate after cooling enters the circulation feed liquid pipeline of crystallisation by cooling system, after mixing with circulation feed liquid and water cooler carry out heat exchange, cooled supersaturation feed liquid enters crystallizer, enter bottom crystallisation chamber via crystallizer internal flow, contact with crystal grain crystalline growth step by step class settling discharge carry out centrifugation to centrifugal separating device, crystal packing after centrifugal, a part of mother liquor A after separation and crystallizer upper strata feed liquid enter again circulating line further water dense with sodium sulfate mix, cooling, be circulated back to crystallisation chamber and again participate in crystallization, circulation like this continuous seepage crystalline product, part mother liquor A is by outside leakage fluid dram discharge system, it is characterized in that: the leakage fluid dram of the centrifugal separating device in described MVR system is connected with a fluid inlet of the crystallizer in freezing and crystallizing system by pipeline, the leakage fluid dram of the centrifugal separating device in described freezing and crystallizing system is connected by the liquid-inlet pipe of pipeline with MVR system.
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