CN112624464A - Treatment device for smoke washing wastewater - Google Patents
Treatment device for smoke washing wastewater Download PDFInfo
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- CN112624464A CN112624464A CN202011218787.0A CN202011218787A CN112624464A CN 112624464 A CN112624464 A CN 112624464A CN 202011218787 A CN202011218787 A CN 202011218787A CN 112624464 A CN112624464 A CN 112624464A
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- washing wastewater
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- electrodialysis
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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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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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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
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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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)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a treatment device for smoke washing wastewater, which comprises: the pretreatment unit is used for adjusting the temperature and the pH value of the smoke washing wastewater; the electrodialysis unit is connected to the pretreatment unit and is used for removing salt and ammonia nitrogen in the smoke washing wastewater; an evaporation unit connected to the electrodialysis unit for evaporating moisture in the flue gas washing wastewater to form concentrated flue gas washing wastewater; and the crystallization unit is connected to the evaporation unit and is used for crystallizing and separating out salt in the concentrated smoke washing wastewater.
Description
Technical Field
The invention relates to the field of garbage treatment, in particular to a treatment device for smoke washing wastewater.
Background
In recent years, along with the waste incineration power plant fume emission standard is stricter and stricter, the fume treatment mostly adopts semidry method or wet process, in the processing procedure, can produce a large amount of wash cigarette waste water, soluble pollutant almost all enters into wash cigarette waste water in the flue gas, and in order to reduce the water consumption, wash cigarette waste water through manifold cycles, the pollutant is further concentrated, lead to the quality of water of washing cigarette waste water very poor, the wash cigarette waste water of waste incineration power plant all contains a large amount of chloride ions, sulfate radical ion, sodium ion, contain partial ammonia nitrogen, the water after the requirement is handled can reach emission/retrieval and utilization standard.
The existing waste incineration plants mostly adopt Reverse Osmosis (RO) technology to treat the smoke-washing wastewater, the overall recovery rate can only reach about 50 percent, and the rest 50 percent of concentrated water needs to be recycled. In the recycling process, part of stable and dissolved salt enters fly ash of flue gas, secondary pollution can be caused, part of volatile substances such as ammonia nitrogen can get back to the waste water of flue gas washing again, ammonia nitrogen accumulation can be formed after long-term operation, and the removal rate of the ammonia nitrogen by a Reverse Osmosis (RO) process is gradually reduced, so that the problems of unstable system operation, substandard produced water, substandard flue gas and the like are caused.
Therefore, there is a need to provide a device for treating waste water from smoke cleaning to solve the above problems.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention provides a treatment device for smoke washing wastewater, which comprises:
the pretreatment unit is used for adjusting the temperature and the pH value of the smoke washing wastewater;
the electrodialysis unit is connected to the pretreatment unit and is used for removing salt and ammonia nitrogen in the smoke washing wastewater;
an evaporation unit connected to the electrodialysis unit for evaporating moisture in the flue gas washing wastewater to form concentrated flue gas washing wastewater;
and the crystallization unit is connected to the evaporation unit and is used for crystallizing and separating out salt in the concentrated smoke washing wastewater.
Further, the pretreatment unit comprises a cooler to reduce the temperature of the smoke washing wastewater.
Further, the pretreatment unit comprises an adjusting tank for adjusting the water quantity and the water quality of the smoke washing wastewater.
Further, the pH value of the smoke washing wastewater is adjusted to 6-7 through a pretreatment unit.
Further, the electrodialysis unit comprises a frequent reverse-polarity electrodialysis system.
Further, the tobacco washing wastewater is treated by the electrodialysis unit to form electrodialysis water and electrodialysis concentrated water.
Further, the evaporation unit includes a low temperature evaporator.
Further, the electrodialysis concentrated water is treated by the evaporation unit to form evaporation produced water and evaporation concentrated water.
Further, the crystallization unit comprises a crystallization tank.
According to the treatment device for the smoke washing wastewater provided by the invention, the smoke washing wastewater is sequentially treated by the pretreatment unit, the electrodialysis unit, the evaporation unit and the crystallization unit, so that zero emission and full recycling of the smoke washing wastewater are realized, and the treatment device has the advantages of no pollution, stable equipment operation, low cost and the like.
Drawings
The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
In the drawings:
fig. 1 is a schematic structural view of a treatment apparatus for smoke washing waste water according to an exemplary embodiment of the present invention.
100. Pre-processing unit
200. Electrodialysis unit
201. Electrodialytic water production
202. Electrodialysis to concentrate water
300. Evaporation unit
301. Water produced by evaporation
302. Evaporating the concentrated water
400. Crystallization unit
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
In the following description, a detailed description will be given to illustrate the evaporation unit of the present invention in order to thoroughly understand the present invention. It will be apparent that the practice of the invention is not limited to the specific details known to those skilled in the art of waste treatment. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.
Aiming at the problems of low recovery rate, incapability of dissolving concentrated water, unstable operation and the like of the existing smoke washing wastewater treatment process, the invention provides a smoke washing wastewater treatment device, which comprises:
the pretreatment unit 100 is used for adjusting the temperature and the pH value of the smoke washing wastewater;
an electrodialysis unit 200 connected to the pretreatment unit 100 for removing salt and ammonia nitrogen from the smoke washing wastewater;
an evaporation unit 300 connected to the electrodialysis unit 200 for evaporating moisture in the flue gas washing wastewater to form concentrated flue gas washing wastewater;
a crystallization unit 400 connected to the evaporation unit 300 for crystallizing out the salt in the concentrated smoke washing wastewater.
Because the flue gas temperature generated by the waste incineration is higher, the flue gas washing wastewater generated after the semi-dry method or wet method treatment on the flue gas also has higher temperature, usually 60-80 ℃, and meanwhile, the waste incineration flue gas contains a large amount of acidic pollutants such as hydrogen chloride and the like, so that a large amount of chloride ions and sulfate ions are accumulated in the flue gas washing wastewater, certain corrosion is caused on subsequent treatment facilities, and especially under the condition of high temperature, the corrosion degree is obviously improved. Therefore, it is necessary to cool the smoke washing wastewater first to ensure the stable operation of the smoke washing wastewater treatment device.
Illustratively, the pretreatment unit includes a cooler to reduce the temperature of the fume scrubbing waste water.
In one embodiment, a shell and tube cooler is used, which is composed of an outer shell and an inner cooler body. The outer housing includes: the device comprises a cylinder body, a water distribution cover and a water return cover, wherein a smoke washing waste water inlet/outlet pipe and a cooling water inlet/outlet pipe are arranged on the cylinder body, and a drainage plug screw, a thermometer interface and the like are additionally arranged on the cylinder body. The cooler body consists of a cooler pipe, a fixed hole disc, a movable hole disc, a baffle plate and the like. The two ends of the cooler pipe are connected with the fixed hole disc and the movable hole disc, the fixed hole disc is connected with the outer body flange, and the movable hole disc can freely stretch out and draw back in the outer body, so that the influence of temperature on the cooler pipe caused by expansion with heat and contraction with cold is eliminated. The baffles serve to enhance heat transfer and support the cooler tubes. The smoke washing waste water flows from the tube cooler to the tube outlet via the tube inlets on the cylinder body and the deflection channels in turn. The cooling water flows by adopting a double-tube pass, namely the cooling water enters one half of the cooler tubes from the water inlet through the water dividing cover and then flows into the other half of the cooler tubes from the water return cover to enter the water dividing cover at the other side and the water outlet pipe. And in the double-pipe process flow process, the cooling water absorbs the waste heat of the smoke washing wastewater and is discharged from the water outlet, so that the smoke washing wastewater is cooled.
It should be noted that the tube cooler is only an example, and any heat exchange device capable of reducing the temperature of the smoke washing waste water can be applied to the invention.
Illustratively, the pretreatment unit 100 includes a conditioning tank for conditioning the amount and quality of the flue gas washing wastewater. Further, the pH value of the smoke washing wastewater is adjusted to 6-7 through a pretreatment unit.
In one embodiment, the conditioning tank is configured to condition the amount and quality of the flue gas scrubbing wastewater. The regulating reservoir volume provides the buffer capacity to washing cigarette waste water treatment load, because wash the period that cigarette waste water collection can appear peak value and valley, for guaranteeing the operation of the continuous steady flow volume of technology, carries out the water yield through the regulating reservoir and adjusts to it is even to make the play water, reduces the flow fluctuation. Adjusting the water quality comprises mixing the smoke washing wastewater with different time or different water quality, so that the effluent pH value and water quality are more uniform, and the follow-up treatment facility is prevented from bearing overlarge impact load. Specifically, since a large amount of acidic gas is present in the waste incineration flue gas, the generated smoke washing wastewater is acidic, and usually, alkali is added to the smoke washing wastewater to adjust the pH value of the smoke washing wastewater to 6 to 7.
A large amount of ions, heavy metals and the like still exist in the smoke washing wastewater treated by the pretreatment unit 100, and the electrodialysis unit 200 is adopted in the treatment device for smoke washing wastewater provided by the invention to remove salt and ammonia nitrogen in the smoke washing wastewater.
As one example, the electrodialysis unit 200 includes a frequent reverse-polarity Electrodialysis (EDR) system. The EDR technology is a method for separating different solute particles (such as ions) by utilizing the selective permeability of a semipermeable membrane under the action of an electric field, and anion-cation exchange membranes and cation-cation exchange membranes are alternately arranged between a positive electrode and a negative electrode and are separated by a special partition plate to form a dilute chamber and a dense chamber for removing ions, ammonia nitrogen, heavy metals and the like in smoke washing wastewater. The EDR system comprises an electrodialysis body, a rectifier and an automatic electrode reversing system, when the smoke washing wastewater is introduced into the compartment, cations migrate to the negative electrode under the action of a direct current electric field and can only pass through a cation exchange membrane, anions migrate to the positive electrode and can only pass through an anion exchange membrane, so that the smoke washing wastewater in the dilute chamber is desalted, and the smoke washing wastewater in the dense chamber is concentrated. In the operation process, the EDR switches the polarity of the positive and negative electrodes once (i.e. frequently switching the polarity) at regular intervals (e.g. 15min-20min), and the polarity switching procedure is as follows: firstly, the polarity of a direct current power supply electrode is switched, so that a thick room and a thin room are exchanged, and the ion flow is reversely carried out; secondly, switching water inlet and outlet valves to interchange water supply and drainage systems of the dense chamber and the dilute chamber; thirdly, after the polarity of the electrode is switched, the electrode lasts for 1min-2min, unqualified fresh water is returned to a concentrated water system, and then concentrated water and fresh water respectively go to the same path to recover normal operation. The EDR system is also capable of automatically cleaning dirt formed on the surfaces of the ion exchange membrane and the electrodes to ensure long-term stability of the ion exchange membrane efficiency and quality and quantity of fresh water.
The EDR system has the following advantages over Reverse Osmosis (RO) desalination, which is commonly employed in the prior art: the method has good removal rate for ions with low RO membrane interception rate such as nitrate radical, ammonia nitrogen and the like; the RO process generally requires a water inlet pressure of 3-4MPa, whereas the EDR can be operated at a water inlet pressure of 0.2-0.5 MPa; because the pressure is low, the EDR can adopt a plastic pipe fitting, the maintenance is simple and convenient, the energy consumption is low, and the noise is low; the RO process requires an acid and other chemicals, whereas EDR requires no or only a small amount of chemicals due to the polarity conversion; the water produced by RO process is acidic (pH 4-5) and EDR is neutral (pH 7); the RO membrane is easy to block, and the EDR ion exchange membrane is not easy to block.
The tobacco washing wastewater is treated by the electrodialysis unit 200 to form electrodialysis produced water 201 and electrodialysis concentrated water 202, the electrodialysis produced water 201 is fresh water generated by desalination and desalination in the diluting chamber, the water quality meets the discharge/reuse requirements, and the electrodialysis produced water can be reused for treating the smoke to generate the tobacco washing wastewater; the electrodialysis concentrated water 202 is concentrated water generated by concentrating the above-mentioned concentration chambers, and enters the subsequent evaporation unit 300 for further treatment.
Illustratively, the vaporizing unit 300 includes a low temperature vaporizer.
The Low Temperature Evaporation (LTE) technique is a gas separation technique, which mainly uses a carrier gas and a dehumidification method to analyze the salt content and water in the electrodialysis concentrated water 202, so as to further reduce the electrodialysis concentrated water 202. In order to prevent the damage of high temperature to solute and solvent, the method of reducing pressure is often adopted to reduce the boiling point of the solute, thereby reducing the cost and protecting the original characteristics of the solute.
As an example, the low-temperature evaporator includes a heating chamber composed of a plurality of vertically arranged tubes, and the electrodialysis concentrate water 202 is introduced into the tubes, and the heat source is located outside the tubes, so that heat exchange between the electrodialysis concentrate water 202 and the heat source is performed, thereby further concentrating the electrodialysis concentrate water 202. The low temperature evaporator may reconcentrate the electrodialysis concentrate water 202 by 3-6 times. The heat source of the low-temperature steam device can adopt waste heat generated in the waste incineration process so as to reduce the treatment cost of the smoke washing wastewater.
The electrodialysis concentrated water 202 is evaporated at normal pressure and low temperature by an evaporation unit 300 to form evaporation produced water 301 and evaporation concentrated water 302, the evaporation produced water 301 has good water quality, meets the emission/recycling requirements, and can be reused for flue gas treatment to generate smoke washing wastewater; the evaporated concentrate water 302 is further concentrated by about 5 times to the electrodialysis concentrate water 202, and then enters the subsequent crystallization unit 400 for further treatment.
Illustratively, the crystallization unit 400 includes a crystallization tank.
The crystallization unit 400 is mainly used for crystallizing and separating ions and salts in the evaporated and concentrated water 302. As an example, the interlayer of the crystallization tank is internally provided with chilled water or refrigerant water for rapidly cooling the evaporated and concentrated water 302 in the crystallization tank to generate crystallized salt, and since the evaporated and concentrated water 302 is already a supersaturated solution, zero emission of the smoke washing wastewater can be realized through the crystallization tank, and the mixed salt with better quality is obtained.
It should be noted that the crystallization method of the crystallization tank includes, but is not limited to, cooling crystallization, evaporative crystallization, temperature-raising crystallization, reactive crystallization, and salting-out crystallization, and any crystallization apparatus capable of crystallizing the evaporated and concentrated water 302 can be applied to the present invention.
According to the treatment device for the smoke washing wastewater provided by the invention, the smoke washing wastewater is sequentially treated by the pretreatment unit, the electrodialysis unit, the evaporation unit and the crystallization unit, so that zero emission and full recycling of the smoke washing wastewater are realized, and the treatment device has the advantages of no pollution, stable equipment operation, low cost and the like.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A processing apparatus of tobacco washing waste water, characterized by comprising:
the pretreatment unit is used for adjusting the temperature and the pH value of the smoke washing wastewater;
the electrodialysis unit is connected to the pretreatment unit and is used for removing salt and ammonia nitrogen in the smoke washing wastewater;
an evaporation unit connected to the electrodialysis unit for evaporating moisture in the flue gas washing wastewater to form concentrated flue gas washing wastewater;
and the crystallization unit is connected to the evaporation unit and is used for crystallizing and separating out salt in the concentrated smoke washing wastewater.
2. The apparatus for treating smoke-washing waste water according to claim 1, wherein said pretreatment unit comprises a cooler to reduce the temperature of said smoke-washing waste water.
3. The apparatus for treating wastewater from smoke scrubber as claimed in claim 1, wherein the pre-treatment unit comprises a regulating tank for regulating the amount and quality of the wastewater from smoke scrubber.
4. The apparatus for treating smoke-washing wastewater according to claim 3, wherein the pH value of the smoke-washing wastewater is adjusted to 6 to 7 by a pretreatment unit.
5. The smoke waste water treatment apparatus of claim 1 wherein the electrodialysis unit comprises a frequent reverse-polarity electrodialysis system.
6. The apparatus for treating wastewater from smoke scrubber as defined in claim 5, wherein the wastewater from smoke scrubber is treated by the electrodialysis unit to form electrodialysis water and electrodialysis concentrate water.
7. The apparatus for treating smoke-washing wastewater according to claim 6, wherein said evaporation unit comprises a low-temperature evaporator.
8. The apparatus for treating smoke-washing wastewater as defined in claim 7, wherein said electrodialysis-concentrated water is treated by said evaporation unit to form evaporation product water and evaporation-concentrated water.
9. The apparatus for treating smoke-washing wastewater according to claim 1, wherein said crystallization unit comprises a crystallization tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011218787.0A CN112624464A (en) | 2020-11-04 | 2020-11-04 | Treatment device for smoke washing wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011218787.0A CN112624464A (en) | 2020-11-04 | 2020-11-04 | Treatment device for smoke washing wastewater |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351352A (en) * | 2011-07-04 | 2012-02-15 | 昆明理工大学 | Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate |
| CN106241972A (en) * | 2016-08-23 | 2016-12-21 | 盛发环保科技（厦门）有限公司 | Based on electrodialytic zero emission treatment of desulfured waste water and system |
| CN109095656A (en) * | 2018-10-11 | 2018-12-28 | 广州环投设计研究院有限公司 | One kind washing cigarette wastewater processing technology |
| CN111170554A (en) * | 2019-10-29 | 2020-05-19 | 光大环保技术研究院（南京）有限公司 | A processing apparatus for waste water of high organic matter of high salt |
-
2020
- 2020-11-04 CN CN202011218787.0A patent/CN112624464A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351352A (en) * | 2011-07-04 | 2012-02-15 | 昆明理工大学 | Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate |
| CN106241972A (en) * | 2016-08-23 | 2016-12-21 | 盛发环保科技（厦门）有限公司 | Based on electrodialytic zero emission treatment of desulfured waste water and system |
| CN109095656A (en) * | 2018-10-11 | 2018-12-28 | 广州环投设计研究院有限公司 | One kind washing cigarette wastewater processing technology |
| CN111170554A (en) * | 2019-10-29 | 2020-05-19 | 光大环保技术研究院（南京）有限公司 | A processing apparatus for waste water of high organic matter of high salt |
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