CN102923893A - System and method for treating wastewater containing sodium chloride - Google Patents
System and method for treating wastewater containing sodium chloride Download PDFInfo
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- CN102923893A CN102923893A CN2012104222558A CN201210422255A CN102923893A CN 102923893 A CN102923893 A CN 102923893A CN 2012104222558 A CN2012104222558 A CN 2012104222558A CN 201210422255 A CN201210422255 A CN 201210422255A CN 102923893 A CN102923893 A CN 102923893A
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a system and method for treating wastewater containing sodium chloride. The system for treating wastewater containing sodium chloride comprises a crystallization centrifugal separation system and is characterized in that the crystallization centrifugal separation system comprises a hydrocyclone, a thickener and a centrifugal machine which are sequentially connected, wherein the hydrocyclone is connected with a triple effect evaporation device used for concentrating wastewater containing the sodium chloride. The system has the beneficial effects of realizing zero emission of the wastewater, reducing negative effects of salt-containing wastewater emission on local surface water body and agricultural production, recycling a large quantity of steam condensate and sodium chloride, realizing win-win targets of economic benefit and environmental protection benefit, reducing consumption of live steam and lowering operation cost, and has a wider application prospect in the high-salinity wastewater treatment project.
Description
(1) technical field
The present invention relates to technical field of waste water processing, particularly a kind for the treatment of system of waste water of sodium chloride-containing and treatment process thereof.
(2) background technology
The discharging of the waste water of sodium chloride-containing can cause environmental pollution, if the sodium chloride content height also can cause the wasting of resources in the waste water.
(3) summary of the invention
The invention provides a kind for the treatment of system and treatment process thereof of waste water of the sodium chloride-containing of avoiding environmental pollution, the wasting of resources.
The present invention is achieved through the following technical solutions:
A kind for the treatment of system of waste water of sodium chloride-containing, comprise the crystallization centrifugal separation system, its special character is: this crystallization centrifugal separation system comprises swirler, thickener and the whizzer that connects successively, and swirler is connected with a triple-effect evaporation plant that is used for the waste water of concentrated sodium chloride-containing.
The treatment system of the waste water of sodium chloride-containing of the present invention, triple-effect evaporation plant comprises the first effect evaporation unit that connects successively, the second effect evaporation unit, triple-effect evaporation plant, the first effect evaporation unit comprises an effect well heater, 1st effective evaporator, the second effect evaporation unit comprises two effect well heaters, 2nd effect evaporator, triple-effect evaporation plant comprises the triple effect well heater, triple-effect evaporator, one effect well heater and 1st effective evaporator, two effect well heater and 2nd effect evaporators, the triple effect well heater all is communicated with by forced circulation pump is installed with triple-effect evaporator, the waste water of sodium chloride-containing enters an effect well heater, the Waste water concentrating of sodium chloride-containing also produces steam, steam enters two effect well heaters through 1st effective evaporator, the waste water of the sodium chloride-containing that major part was concentrated also enters for two effect well heaters, concentrated under the effect of steam, waste water circulating and evaporating under the effect of forced circulation pump of the sodium chloride-containing that part was concentrated, the waste water of sodium chloride-containing are according to this by the triple effect well heater, the triple-effect evaporator heating is concentrated.
The method of wastewater treatment of sodium chloride-containing of the present invention, its special character is: may further comprise the steps:
(1) concentrated: the waste water of sodium chloride-containing enters triple-effect evaporation plant and concentrates and obtain concentrated mother liquor;
(2) separate: concentrated mother liquor enters swirler to carry out solid-liquid two and is separated, obtain light constituent, recombinate and divide, the light constituent that the swirler overflow port is discharged is sent into again evaporation concentration of triple-effect evaporation plant, restructuring minute then flows into thickener and obtains strong brine, and this strong brine is sent into the whizzer centrifugation and obtained sodium-chlor Industrial Salt byproduct.
The method of wastewater treatment of sodium chloride-containing of the present invention, the described sodium-chlor Industrial Salt of step (2) byproduct water content≤8%, deliver to the product feed bin, under the acting in conjunction of worm conveyor and rotary pocket feeder, send into automatic packing machine and pack, bagged product specification 25kg/ bag.
The method of wastewater treatment of sodium chloride-containing of the present invention, the vapor pressure 0.35MPa of one of triple-effect evaporation plant effect well heater in the step (1), one, two, the vaporization temperature of triple-effect evaporator is respectively 100-110 ℃, 85-95 ℃, 65-75 ℃, vacuum tightness is respectively-0.02-0MPa ,-0.05--0.06MPa and-0.08--0.09 Mpa, the concentrated mother liquor sodium chloride concentration that triple-effect evaporation plant is discharged is 50%.
Beneficial effect of the present invention: suit measures to local conditions to implement waste water reclaiming regeneration engineering, not only can realize wastewater zero discharge, reduce the brine waste discharging to the negative impact of local surface water body and agriculture production generation, but also recyclable a large amount of steam condensate and sodium-chlor can be realized the target of economic benefit and environmental benefit doulbe-sides' victory; This process using " triple effect evaporation+crystallization centrifugation " combination process carries out advanced treatment to brine waste, this technique characteristics such as maturation, stable and reliable operation that possess skills, and administering in the engineering at high-salt wastewater has comparatively wide application prospect; Triple-effect evaporation plant is the negative pressure concentration and evaporation, rear single-effect evaporator can utilize secondary steam that front effect steamer flashes off to waste water carry out salt, moisture from, the consumption of steam is given birth in minimizing that can be a large amount of, and then reduces working cost.
(4) description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Accompanying drawing 1 is process flow sheet of the present invention;
Among the figure, 1 one effect well heaters, 2 1st effective evaporators, 3 two effect well heaters, 4 2nd effect evaporators, 5 triple effect well heaters, 6 triple-effect evaporators, 7 swirlers, 8 thickeners, 9 whizzers.
(5) embodiment
The invention provides a kind for the treatment of system of waste water of sodium chloride-containing, it comprises the crystallization centrifugal separation system, this crystallization centrifugal separation system comprises swirler 7, thickener 8 and the whizzer 9 that connects successively, and swirler 7 is connected with a triple-effect evaporation plant that is used for the waste water of concentrated sodium chloride-containing.Triple-effect evaporation plant comprises the first effect evaporation unit that connects successively, the second effect evaporation unit, triple-effect evaporation plant, the first effect evaporation unit comprises an effect well heater 1,1st effective evaporator 2, the second effect evaporation unit comprises two effect well heaters 3,2nd effect evaporator 4, triple-effect evaporation plant comprises triple effect well heater 5, triple-effect evaporator 6, one effect well heater 1 and 1st effective evaporator 2, two effect well heaters 3 and 2nd effect evaporator 4, triple effect well heater 5 all is communicated with by forced circulation pump is installed with triple-effect evaporator 6, the waste water of sodium chloride-containing enters an effect well heater 1, the Waste water concentrating of sodium chloride-containing also produces steam, steam enters two effect well heaters 3 through 1st effective evaporator 2, the waste water of the sodium chloride-containing that major part was concentrated also enters for two effect well heaters 3, concentrated under the effect of steam, waste water circulating and evaporating under the effect of forced circulation pump of the sodium chloride-containing that part was concentrated, the waste water of sodium chloride-containing are according to this by triple effect well heater 5, triple-effect evaporator 6 heating are concentrated.
The waste water of sodium chloride-containing is sent into Waste Water Treatment after existing sewage works acidifying dechlorination oxide treatment.
Acidifying oxidation water outlet is temporary in subsider, be promoted to the triple-effect evaporation plant evaporation concentration via the mother liquor pump, the present invention adopts band to force the system of three-effect downstream evaporator mode of outer circulation, process control parameter: the vapor pressure of an effect well heater 1 is 0.35MPa, one, two, the vaporization temperature of triple-effect evaporator is respectively 100-110 ℃, 85-95 ℃, 65-75 ℃, vacuum tightness is respectively-0.02-0MPa ,-0.05--0.06MPa and-0.08--0.09 MPa.After containing the mother liquor process under meter metering of sodium-chlor, send into an effect well heater 1, the Waste water concentrating of sodium chloride-containing also produces steam, steam enters two effect well heaters 3 through 1st effective evaporator 2, the waste water of the sodium chloride-containing that major part was concentrated also enters for two effect well heaters 3, concentrated under the effect of steam, waste water circulating and evaporating under the effect of forced circulation pump of the sodium chloride-containing that part was concentrated, the waste water of sodium chloride-containing is according to this by triple effect well heater 5, triple-effect evaporator 6 heating are concentrated, two, in the triple effect evaporation process, considered that the part crystal separates out, therefore two, the triple-effect evaporator bottom installs a forced circulation pump additional, avoids the material of crystallization to adhere on the inwall of heating tube.Sodium chloride concentration is 50% in the concentrated mother liquor that triple-effect evaporator 6 is discharged, concentrated mother liquor enters the crystallization centrifugal separation system by discharging pump, steam enters one, two, after the wastewater heat exchange of triple effect well heater and sodium chloride-containing, respectively by one, two, the bottom of triple effect well heater flows out, then enter and be used for boiler replenishing water in the condensation liquid bath, triple-effect evaporator 6 is connected with a surface condenser, will use as circulating water system from the vapor condensation of triple-effect evaporator 6.
The crystallization centrifugal separation system mainly comprises swirler 7, thickener 8 and whizzer 9.Concentrated mother liquor from triple effect evaporation tangentially enters swirler 7 by pump with certain pressure, in swirler 7 cylindrical cavities, produce the high speed rotating flow field, recombinate in the mother liquor to divide under the effect of eddy flow field and move downward vertically simultaneously, radially outwards motion, move downward along wall reaching cone segments, and discharged by underflow opening, so just formed outer swirling flow field, the component that density is little is moved to central axial direction, and form the interior vortex move upward in axis centre, then discharged by overflow port, and then realize the purpose that solid-liquid two is separated.The light constituent that swirler 7 overflow ports are discharged is sent into again evaporation concentration of triple-effect evaporator, recombinates to divide then to flow into thickener 8.Thickener 8 utilizes the principle of crystalline particle gravity settling, further carries out feed separation, and its separating obtained strong brine is sent into whizzer 9.After whizzer 9 main motors make the centrifuge drum full-speed operation by transmission belt, mixture is introduced in the cloth tray by feed-pipe continuously, and turn on the inner segment screen wall being evenly distributed to one-level under the effect of centrifugal force, most of liquid phase passes filter screen and the rotatory drum wall filter opening is discharged, enter the mother liquor pond through liquid discharge pipe, solid formation is trapped in the one-level rotary drum and forms annular cake layer.In the time of one-level, the synchronized rotation of secondary rotary drum, under piston promotes, the to-and-fro movement of one-level rotary drum continuous axial, and then pusher dish promotion one-level rotary drum cake layer intermittently constantly outwards moves discharge one-level rotary drum, enter the secondary rotary drum and further separate and form annular cake layer, one-level rotary drum outer face then promotes the intermittently outside mobile secondary rotary drum of discharging constantly of outer drum cake layer.
Whizzer 9 centrifugation gained material water ratio≤8% are delivered to the product feed bin, send into automatic packing machine and pack under the acting in conjunction of worm conveyor and rotary pocket feeder, obtain sodium-chlor Industrial Salt byproduct, its bagged product specification 25kg/ bag.
On this basis, efflux wastewater is carried out resource recycling, not only can reclaim a large amount of steam condensates and byproduct sodium-chlor, and realized wastewater zero discharge, have higher environmental benefit and economic benefit, present technique is after certain factory implements, and waste water discharge-reducing and recovered material see table for details.
Table 1: reduce discharging and the resource yield after the waste water advanced processing project implementation
| Sequence number | Project | Generation | Remarks |
| 1 | Steam condensate | 256.2 ton/day | Recyclable for boiler replenishing water |
| 2 | Sodium-chlor | 26.49 ton/day | Be mainly used in industrial chemicals, Snow Agent etc. |
| 3 | The waste water discharge-reducing amount | 282.7 ton/day | Pollutant discharge of enterprise takes reduction |
This enterprise used present technique 11 months, and the data class of the waste water discharge-reducing that obtains and recovered material data and table 1 seemingly.
Claims (5)
1. the treatment system of the waste water of a sodium chloride-containing, comprise the crystallization centrifugal separation system, it is characterized in that: this crystallization centrifugal separation system comprises swirler, thickener and the whizzer that connects successively, and swirler is connected with a triple-effect evaporation plant that is used for the waste water of concentrated sodium chloride-containing.
2. the treatment system of the waste water of sodium chloride-containing according to claim 1, it is characterized in that: triple-effect evaporation plant comprises the first effect evaporation unit that connects successively, the second effect evaporation unit, triple-effect evaporation plant, the first effect evaporation unit comprises an effect well heater, 1st effective evaporator, the second effect evaporation unit comprises two effect well heaters, 2nd effect evaporator, triple-effect evaporation plant comprises the triple effect well heater, triple-effect evaporator, effect well heater and a 1st effective evaporator, two effect well heater and 2nd effect evaporators, the triple effect well heater all is communicated with by forced circulation pump is installed with triple-effect evaporator.
3. the method for wastewater treatment of sodium chloride-containing according to claim 2 is characterized in that: may further comprise the steps:
(1) concentrated: the waste water of sodium chloride-containing enters triple-effect evaporation plant and concentrates and obtain concentrated mother liquor;
(2) separate: concentrated mother liquor enters swirler to carry out solid-liquid two and is separated, obtain light constituent, recombinate and divide, the light constituent that the swirler overflow port is discharged is sent into again evaporation concentration of triple-effect evaporation plant, restructuring minute then flows into thickener and obtains strong brine, and this strong brine is sent into the whizzer centrifugation and obtained sodium-chlor Industrial Salt byproduct.
4. the method for wastewater treatment of sodium chloride-containing according to claim 3 is characterized in that: the described sodium-chlor Industrial Salt of step (2) byproduct water content≤8%.
5. the method for wastewater treatment of sodium chloride-containing according to claim 3, it is characterized in that: the vapor pressure 0.35MPa of one of triple-effect evaporation plant effect well heater in the step (1), one, two, the vaporization temperature of triple-effect evaporator is respectively 100-110 ℃, 85-95 ℃, 65-75 ℃, vacuum tightness is respectively-0.02-0MPa ,-0.05--0.06MPa and-0.08--0.09 MPa.
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Cited By (10)
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| CN103880239A (en) * | 2013-12-19 | 2014-06-25 | 江苏北辰环境科技有限公司 | Treatment process of high-concentration salt-containing wastewater |
| CN103991997A (en) * | 2014-05-30 | 2014-08-20 | 中国石油集团东北炼化工程有限公司吉林设计院 | Strong brine evaporating and crystallizing system |
| CN104310681A (en) * | 2014-06-24 | 2015-01-28 | 新疆敦华石油技术有限公司 | Multiple-effect evaporation processing equipment |
| CN104692418A (en) * | 2015-03-12 | 2015-06-10 | 吉首大学 | Device for centrifugal recovery of saline water after concentration and crystallization |
| CN104724872A (en) * | 2013-12-24 | 2015-06-24 | 上海泰禾化工有限公司 | Method for recycling sodium chloride from waste water generated during production of phenoxyacetic acid pesticide |
| CN105152249A (en) * | 2015-10-03 | 2015-12-16 | 中国轻工业长沙工程有限公司 | Evaporative crystallization technology for metallurgy high-concentration salt-containing wastewater |
| CN107867776A (en) * | 2017-11-08 | 2018-04-03 | 江苏易简环保科技有限公司 | A kind of method and technique by agricultural chemicals waste water recycling |
| CN109045830A (en) * | 2018-08-23 | 2018-12-21 | 徐翔 | Mother liquor discharge system |
| CN109650410A (en) * | 2019-02-28 | 2019-04-19 | 仲恺农业工程学院 | A kind of method that sodium chloride crystal is precipitated in induction high-salt wastewater |
| CN116835819A (en) * | 2023-08-07 | 2023-10-03 | 北京新源智慧水务科技有限公司 | Softening and descaling treatment device and method for seed crystal crystallization method |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103880239A (en) * | 2013-12-19 | 2014-06-25 | 江苏北辰环境科技有限公司 | Treatment process of high-concentration salt-containing wastewater |
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| CN104724872A (en) * | 2013-12-24 | 2015-06-24 | 上海泰禾化工有限公司 | Method for recycling sodium chloride from waste water generated during production of phenoxyacetic acid pesticide |
| CN104724872B (en) * | 2013-12-24 | 2017-09-15 | 上海泰禾国际贸易有限公司 | The method that sodium chloride is reclaimed from the waste water of production phenoxy acetic acid class agricultural chemicals |
| CN103991997A (en) * | 2014-05-30 | 2014-08-20 | 中国石油集团东北炼化工程有限公司吉林设计院 | Strong brine evaporating and crystallizing system |
| CN103991997B (en) * | 2014-05-30 | 2016-04-13 | 中国石油集团东北炼化工程有限公司吉林设计院 | Strong brine evaporation and crystallization system |
| CN104310681B (en) * | 2014-06-24 | 2016-09-14 | 新疆敦华石油技术股份有限公司 | A kind of multiple-effect evaporation processing equipment |
| CN104310681A (en) * | 2014-06-24 | 2015-01-28 | 新疆敦华石油技术有限公司 | Multiple-effect evaporation processing equipment |
| CN104692418A (en) * | 2015-03-12 | 2015-06-10 | 吉首大学 | Device for centrifugal recovery of saline water after concentration and crystallization |
| CN105152249A (en) * | 2015-10-03 | 2015-12-16 | 中国轻工业长沙工程有限公司 | Evaporative crystallization technology for metallurgy high-concentration salt-containing wastewater |
| CN107867776A (en) * | 2017-11-08 | 2018-04-03 | 江苏易简环保科技有限公司 | A kind of method and technique by agricultural chemicals waste water recycling |
| CN109045830A (en) * | 2018-08-23 | 2018-12-21 | 徐翔 | Mother liquor discharge system |
| CN109045830B (en) * | 2018-08-23 | 2021-02-02 | 徐翔 | Mother liquor discharge system |
| CN109650410A (en) * | 2019-02-28 | 2019-04-19 | 仲恺农业工程学院 | A kind of method that sodium chloride crystal is precipitated in induction high-salt wastewater |
| CN116835819A (en) * | 2023-08-07 | 2023-10-03 | 北京新源智慧水务科技有限公司 | Softening and descaling treatment device and method for seed crystal crystallization method |
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Application publication date: 20130213 |