CN108358260B - Printing and dyeing wastewater treatment system and method - Google Patents
Printing and dyeing wastewater treatment system and method Download PDFInfo
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- CN108358260B CN108358260B CN201810220634.6A CN201810220634A CN108358260B CN 108358260 B CN108358260 B CN 108358260B CN 201810220634 A CN201810220634 A CN 201810220634A CN 108358260 B CN108358260 B CN 108358260B
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- dyeing wastewater
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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
- C02F1/06—Flash 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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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
- C02F1/08—Thin film 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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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
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides a printing and dyeing wastewater treatment system and method. The system comprises a waste water waste heat flash evaporation device, a first-effect evaporator, a second-effect evaporator, a preheater, an organic matter vacuum separation device, a condensate pump and a vacuum pump. The printing and dyeing wastewater firstly enters a preheater for preheating, and then enters a first-effect evaporator and a second-effect evaporator for falling film evaporation to respectively generate first-effect secondary steam and second-effect secondary steam mixed with volatile organic matter gas. A condensate mixture formed by condensing heating steam mixed with volatile organic gas, primary secondary steam and secondary steam generated by the waste water waste heat flash evaporation device enters the organic vacuum separation device for spraying after being boosted by a condensate pump, and the separation of the volatile organic in the condensate is finished. The invention realizes the recycling of the waste heat in the high-temperature wastewater generated in the printing and dyeing process; after the printing and dyeing wastewater is treated by the method, the content of organic matters in the condensed water can be effectively reduced by more than 90 percent, and the requirement of printing and dyeing process water can be met.
Description
Technical Field
The invention belongs to the field of industrial wastewater treatment, and particularly relates to a printing and dyeing wastewater treatment system and method.
Background
China is the first major country of textile printing and dyeing, and printing and dyeing wastewater discharged by the textile printing and dyeing industry is one of the main sources of industrial wastewater in ChinaAccording to incomplete statistics, the discharge amount of the waste water in the printing and dyeing industry of China is about 3 × 10 per day6～4×106m3And 3-5 t of printing and dyeing wastewater is generated when 100m of fabric is processed in the printing and dyeing industry. The printing and dyeing wastewater mainly comes from working sections of desizing, scouring, bleaching, mercerizing, dyeing, printing, finishing and the like, and generally belongs to organic wastewater, and pollutants contained in the organic wastewater are mainly natural organic matters and artificially synthesized organic matters. For a long time, the printing and dyeing wastewater is one of the industrial wastewater which is difficult to treat due to the characteristics of large water quantity, high organic pollutant content, deep chromaticity, large alkalinity, large water quality change and the like.
The energy consumption in the printing and dyeing production process is mainly heat energy, wherein steam accounts for more than 80% of the total printing and dyeing energy consumption. According to statistics, in the dyeing process, about 8% -10% of heat provided by steam is lost through a device heat dissipation mode, 20% of heat is taken away by process cooling water, and the rest 70% of heat is taken away by printing and dyeing wastewater, so that the effective utilization rate of heat energy is only about 35%.
If the printing and dyeing wastewater is directly discharged without being treated, not only can the energy waste be caused, but also the production cost is increased, and the larger organic pollution can be generated to the surrounding receiving water body, so that the ecological system is seriously damaged. In addition to this.
At present, printing and dyeing enterprises face the problems of water resource shortage, water cost price increase and the like. If the printing and dyeing wastewater is deeply treated to ensure that the effluent meets the requirement of the printing and dyeing process water, the water cost and the pollution discharge cost of industrial fresh water can be saved for enterprises, and the pollution of the water environment can be greatly reduced and the environmental load can be lightened for the society. The waste heat of the waste water is recycled, the waste water treatment cost can be greatly reduced, and the competitiveness in the textile printing and dyeing industry is improved.
Disclosure of Invention
The invention aims to provide a printing and dyeing wastewater treatment system and a method, the system can recycle waste heat in high-temperature wastewater, and the organic matter content in condensed water can be effectively reduced by more than 90% after the printing and dyeing wastewater is treated by the system, so that the water requirement of a printing and dyeing process can be met.
The technical solution adopted by the invention is realized as follows:
the invention discloses a printing and dyeing wastewater treatment system, which comprises: the system comprises a waste water waste heat flash evaporation device, a first-effect evaporator, a second-effect evaporator, a preheater, an organic matter vacuum separation device, a condensate pump and a vacuum pump.
The first-effect evaporator and the second-effect evaporator are horizontal tube falling film evaporation condensers.
The preheater is a shell-and-tube heat exchanger.
The organic matter vacuum separation device is a horizontal tube falling film separator.
The tube side of the preheater is connected with the shell side of the organic matter separating device, so that the shell side of the organic matter vacuum separating device is kept in a negative pressure state.
The invention also discloses a printing and dyeing wastewater treatment method by using the printing and dyeing wastewater treatment system, which comprises the following steps:
the high-temperature wastewater enters a wastewater waste heat flash evaporation device for flash evaporation to generate heating steam mixed with volatile organic compound gas;
the heating steam is condensed in a heat exchange pipe of the first-effect evaporator to release latent heat of vaporization, and the preheated printing and dyeing wastewater absorbs the latent heat outside the pipe to evaporate to generate first-effect secondary steam mixed with volatile organic matter gas;
condensing the primary-effect secondary steam in a heat exchange pipe of a secondary-effect evaporator to release latent heat of vaporization, and evaporating the preheated printing and dyeing wastewater by absorbing the latent heat outside the pipe to generate secondary-effect secondary steam mixed with volatile organic matter gas;
condensing the secondary steam in the shell pass of the preheater to release latent heat of vaporization, and preheating the printing and dyeing wastewater by absorbing the latent heat in the tube pass;
a condensate mixture formed by condensing the heating steam mixed with the volatile organic compound gas, the primary secondary steam and the secondary steam is boosted by a condensate pump to enter an organic compound vacuum separation device, the organic compound separation is completed by utilizing the characteristic that the vacuum solubility of the volatile organic compound is greatly reduced, and the separated volatile organic compound gas is pumped out by a vacuum pump.
The temperature of high-temperature wastewater entering the wastewater waste heat flash evaporation device is more than 80, and the temperature of steam mixed with volatile organic gas generated by flash evaporation is 60-65.
The advantages of the invention are obvious and mainly appear as follows:
1. the invention realizes the recycling of the waste heat in the high-temperature wastewater generated in the printing and dyeing process;
2. after the printing and dyeing wastewater is treated by the method, the content of organic matters in the condensed water can be effectively reduced by more than 90 percent, and the requirement of printing and dyeing process water can be met without secondary treatment.
Based on the reasons, the invention has obvious economic benefit and can be widely popularized in the fields of printing and dyeing industrial wastewater treatment and the like.
Drawings
The invention has 1 picture in total, wherein:
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: 1. a waste water waste heat flash evaporation device 2, a first-effect evaporator 3, a second-effect evaporator 4, a preheater 5, an organic matter vacuum separation device 6, a condensate water pump 7 and a vacuum pump
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a printing and dyeing wastewater treatment system includes: the system comprises a waste water waste heat flash evaporation device 1, a first-effect evaporator 2, a second-effect evaporator 3, a preheater 4, an organic matter vacuum separation device 5, a condensate water pump 6 and a vacuum pump 7. Wherein the first-effect evaporator 2 and the second-effect evaporator 3 are horizontal tube falling film evaporation condensers, the preheater 4 is a shell-and-tube heat exchanger, and the organic matter separation device 5 is a horizontal tube falling film separator.
The tube side of the preheater 4 is connected with the shell side of the organic matter separating device 5, so that the shell side of the organic matter vacuum separating device 5 is kept in a negative pressure state.
The method for treating the printing and dyeing wastewater by using the printing and dyeing wastewater treatment system comprises the following steps:
the high-temperature wastewater enters a wastewater waste heat flash evaporation device 1 to be subjected to flash evaporation to generate heating steam mixed with volatile organic compound gas;
the heating steam is condensed in a heat exchange pipe of the first-effect evaporator 2 to release latent heat of vaporization, and the preheated printing and dyeing wastewater absorbs the latent heat outside the pipe to evaporate to generate first-effect secondary steam mixed with volatile organic matter gas;
the primary-effect secondary steam is condensed in a heat exchange pipe of the secondary-effect evaporator 3 to release latent heat of vaporization, and the preheated printing and dyeing wastewater absorbs the latent heat outside the pipe to evaporate to generate secondary-effect secondary steam mixed with volatile organic matter gas;
condensing the secondary steam in the shell pass of the preheater 4 to release latent heat of vaporization, and preheating the printing and dyeing wastewater by absorbing the latent heat in the tube pass;
a condensate mixture formed by condensing the heating steam mixed with the volatile organic gas, the primary secondary steam and the secondary steam is pressurized by a condensate pump 6 and enters an organic vacuum separation device 5, the organic separation is completed by utilizing the characteristic that the vacuum solubility of the volatile organic gas is greatly reduced, and the separated volatile organic gas is pumped out by a vacuum pump 7.
The temperature of the high-temperature wastewater entering the wastewater waste heat flash evaporation device 1 is more than 80, for example: the temperature of the wastewater discharged from the dye vat is 95, and the temperature of a steam mixture mixed with volatile organic gas generated by flash evaporation is required to be 60-65.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A printing and dyeing wastewater treatment method is characterized in that printing and dyeing wastewater is treated by a printing and dyeing wastewater treatment system, and the printing and dyeing wastewater treatment system comprises: the system comprises a waste water waste heat flash evaporation device (1), a first-effect evaporator (2), a second-effect evaporator (3), a preheater (4), an organic matter vacuum separation device (5), a condensate pump (6) and a vacuum pump (7); the first-effect evaporator (2) and the second-effect evaporator (3) are horizontal tube falling film evaporation condensers; the preheater (4) is a shell-and-tube heat exchanger; the organic matter vacuum separation device (5) is a horizontal tube falling film separator; the shell side of the preheater (4) is connected with the shell side of the organic matter separation device (5) so that the shell side of the organic matter vacuum separation device (5) is kept in a negative pressure state; the processing steps are as follows:
the high-temperature wastewater enters a wastewater waste heat flash evaporation device (1) for flash evaporation to generate heating steam mixed with volatile organic compound gas; the temperature of the high-temperature wastewater entering the wastewater waste heat flash evaporation device (1) is more than 80 ℃, and the temperature of steam mixed with volatile organic gas generated by flash evaporation is 60-65 ℃;
the heating steam mixed with the volatile organic gas is condensed in a heat exchange pipe of the first-effect evaporator (2) to release latent heat of vaporization, and the preheated printing and dyeing wastewater absorbs the latent heat outside the pipe to evaporate to generate first-effect secondary steam mixed with the volatile organic gas;
the primary-effect secondary steam is condensed in a heat exchange pipe of the secondary-effect evaporator (3) to release latent heat of vaporization, and the preheated printing and dyeing wastewater absorbs the latent heat outside the pipe to evaporate to generate secondary-effect secondary steam mixed with volatile organic matter gas;
the secondary steam is condensed in the shell pass of the preheater (4), latent heat of vaporization is released, and the printing and dyeing wastewater is preheated by absorbing the latent heat in the tube pass;
a condensate mixture formed by condensing the heating steam mixed with the volatile organic gas, the primary secondary steam and the secondary steam is pressurized by a condensate pump (6) and enters an organic vacuum separation device (5), the organic separation is completed by utilizing the characteristic that the vacuum solubility of the volatile organic is greatly reduced, and the separated volatile organic gas is pumped out by a vacuum pump (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810220634.6A CN108358260B (en) | 2018-03-16 | 2018-03-16 | Printing and dyeing wastewater treatment system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810220634.6A CN108358260B (en) | 2018-03-16 | 2018-03-16 | Printing and dyeing wastewater treatment system and method |
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| CN108358260A CN108358260A (en) | 2018-08-03 |
| CN108358260B true CN108358260B (en) | 2020-06-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574036A (en) * | 1983-01-17 | 1986-03-04 | Ets. Ch. Scareder & Fils | Method and an installation for purifying industrial waste water, particularly process water from dyeing works |
| CN201882942U (en) * | 2010-11-02 | 2011-06-29 | 大连海水淡化工程研究中心有限公司 | Power-generation turboset condenser type sea water desalinating unit |
| CN102557168A (en) * | 2011-12-05 | 2012-07-11 | 北京朗新明环保科技有限公司 | Heat-pipe low-temperature multi-effect sea water desalinating system and process flow |
| CN103185331A (en) * | 2012-08-06 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Medium-high temperature waste water heat energy recovery method and device |
| CN206334369U (en) * | 2016-12-30 | 2017-07-18 | 重庆华彩化工有限责任公司 | Triple effect forced-circulation evaporator |
-
2018
- 2018-03-16 CN CN201810220634.6A patent/CN108358260B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574036A (en) * | 1983-01-17 | 1986-03-04 | Ets. Ch. Scareder & Fils | Method and an installation for purifying industrial waste water, particularly process water from dyeing works |
| CN201882942U (en) * | 2010-11-02 | 2011-06-29 | 大连海水淡化工程研究中心有限公司 | Power-generation turboset condenser type sea water desalinating unit |
| CN102557168A (en) * | 2011-12-05 | 2012-07-11 | 北京朗新明环保科技有限公司 | Heat-pipe low-temperature multi-effect sea water desalinating system and process flow |
| CN103185331A (en) * | 2012-08-06 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Medium-high temperature waste water heat energy recovery method and device |
| CN206334369U (en) * | 2016-12-30 | 2017-07-18 | 重庆华彩化工有限责任公司 | Triple effect forced-circulation evaporator |
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| CN108358260A (en) | 2018-08-03 |
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