CN111995150A - Saline wastewater circulating treatment system and treatment method - Google Patents
Saline wastewater circulating treatment system and treatment method Download PDFInfo
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- CN111995150A CN111995150A CN202010836626.1A CN202010836626A CN111995150A CN 111995150 A CN111995150 A CN 111995150A CN 202010836626 A CN202010836626 A CN 202010836626A CN 111995150 A CN111995150 A CN 111995150A
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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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- 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
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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
- 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
- C02F1/5281—Installations for water purification using chemical 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
- 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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- 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
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
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Abstract
The invention relates to a salt-containing wastewater circulating treatment system and a treatment method. The salt-containing wastewater circulating treatment system comprises a pretreatment device, a first heat exchange device, a crystallization device and a solid-liquid separation device which are sequentially connected; and the second heat exchange device is connected with the crystallization device. And a first transfer piece is connected between the crystallization device and the second heat exchange device and used for transferring liquid generated in the crystallization device to the second heat exchange device for heating. Still be connected with the second between crystallization device and the second heat transfer device and transport the piece in order to be arranged in transporting the steam that produces in the crystallization device to second heat transfer device in order to realize heating the liquid in the second heat transfer device. And a third transfer piece is connected between the crystallization device and the second heat exchange device and used for transferring the liquid heated by the second heat exchange device to the crystallization device. When the processing contains salt waste water, can realize thermal cyclic utilization, salt in the make full use of waste water treatment process effectively gets rid of.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a saline wastewater circulating treatment system and a treatment method.
Background
In the field of wastewater treatment, salt-containing wastewater is relatively common wastewater, and the salt-containing wastewater usually contains more salt. The direct discharge of these salts can have a serious adverse effect on the environment, and therefore, in order to make the wastewater discharge standard, it is necessary to remove these salts from the wastewater. When the waste water is treated, more heat is consumed, which brings additional resource waste. However, the conventional treatment method has difficulty in achieving sufficient utilization of heat and in effectively removing salts from wastewater.
Disclosure of Invention
Based on this, it is necessary to provide a system and a method for recycling salt-containing wastewater. The salt-containing wastewater circulating treatment system can make full use of heat in the wastewater treatment process and effectively remove salt in wastewater.
The technical scheme of the invention is as follows:
one object of the invention is to provide a cyclic treatment system for salt-containing wastewater, which comprises a pretreatment device, a first heat exchange device, a crystallization device and a solid-liquid separation device which are connected in sequence; the second heat exchange device is connected with the crystallization device;
a first transfer piece is connected between the crystallization device and the second heat exchange device and used for transferring liquid generated in the crystallization device to the second heat exchange device for heating;
a second transfer piece is connected between the crystallization device and the second heat exchange device and is used for transferring vapor generated in the crystallization device to the second heat exchange device so as to heat liquid in the second heat exchange device;
and a third transfer piece is connected between the crystallization device and the second heat exchange device and is used for transferring the liquid heated by the second heat exchange device to the crystallization device.
In one embodiment, the salt-containing wastewater recycling treatment system further comprises a steam pressurizing device, wherein the steam pressurizing device is arranged on the first transfer member and is used for pressurizing steam transferred from the crystallization device; and/or the presence of a gas in the gas,
still include vapour rising temperature device, vapour rising temperature device locates in order to be used for on the first transportation piece to the vapour of transporting out in the crystallization device heaies up.
In one embodiment, the saline wastewater recycling treatment system further comprises a fourth transfer part; the fourth transfer part is connected between the crystallization device and the solid-liquid separation device, so that the liquid separated from the solid-liquid separation device is transferred to the crystallization device.
In one embodiment, a demisting device is arranged inside the crystallization device and connected to the inner wall of the crystallization device to demist vapor generated in the crystallization device.
In one embodiment, the salt-containing wastewater recycling treatment system further comprises a liquid storage device connected with the second heat exchange device for storing liquid generated by heat exchange in the second heat exchange device.
In one embodiment, the liquid storage device is connected with the first heat exchange device to realize the transfer of the liquid in the liquid storage device to the first heat exchange device.
In one embodiment, the reservoir is connected to the crystallization device to effect transport of vapor generated in the reservoir to the crystallization device.
In one embodiment, the brine wastewater recycling treatment system further comprises an exhaust gas condensing device, and the exhaust gas condensing device is connected with the second heat exchange device to condense vapor generated in the second heat exchange device and then discharge impurity gas.
In one embodiment, the liquid storage device is connected with the exhaust gas condensation device to receive liquid generated by the exhaust gas condensation device.
In one embodiment, the salt-containing wastewater recycling treatment system further comprises a steam generation device connected with the crystallization device for providing a heat source for the crystallization device.
In one embodiment, the pretreatment device comprises a precipitation device, and the precipitation device is used for performing precipitation treatment on the waste liquid to be treated.
Another object of the present invention is to provide a method for circularly treating salt-containing wastewater, wherein the method for circularly treating salt-containing wastewater adopts the system for circularly treating salt-containing wastewater described in any one of the above embodiments, and the method for circularly treating salt-containing wastewater comprises the following steps:
pretreating the waste liquid to be treated by the pretreatment device to obtain a pretreatment liquid;
heating the pretreatment liquid by the first heat exchange device to obtain a preheating liquid;
the preheating liquid enters the crystallization device for homogenization treatment to obtain a homogeneous liquid;
the homogeneous liquid is transported to the second heat exchange device through the first transport piece to be heated, the heated homogeneous liquid is transported to the crystallization device through the third transport piece to be concentrated to obtain a concentrated liquid, and steam generated by the concentration treatment is transported to the second heat exchange device through the second transport piece to heat the homogeneous liquid in the second heat exchange device;
and the concentrated solution enters the solid-liquid separation device for solid-liquid separation treatment.
In one embodiment, the method for circularly treating the salt-containing wastewater further comprises the following steps: and pressurizing and/or heating the vapor generated by the concentration treatment before the vapor generated by the concentration treatment is transferred to the second heat exchange device.
In one embodiment, the method for pretreating the waste liquid to be treated by the pretreatment device comprises the following steps: and mixing the waste liquid to be treated with a precipitator in the pretreatment device, and precipitating to obtain a pretreatment liquid.
The salt-containing wastewater circulating treatment system comprises a pretreatment device, a first heat exchange device, a crystallization device and a solid-liquid separation device which are sequentially connected; and the second heat exchange device is connected with the crystallization device. And a first transfer piece is connected between the crystallization device and the second heat exchange device and used for transferring liquid generated in the crystallization device to the second heat exchange device for heating. Still be connected with the second between crystallization device and the second heat transfer device and transport the piece in order to be arranged in transporting the steam that produces in the crystallization device to second heat transfer device in order to realize heating the liquid in the second heat transfer device. And a third transfer piece is connected between the crystallization device and the second heat exchange device and used for transferring the liquid heated by the second heat exchange device to the crystallization device. When the salt-containing wastewater is treated, pretreating the waste liquid to be treated by a pretreatment device to obtain a pretreatment liquid; and heating the pretreatment liquid by a first heat exchange device to obtain a preheating liquid. And then the preheating liquid enters a crystallization device for homogenization treatment to obtain a homogeneous liquid. Then the homogeneous liquid is transported to the second heat exchange device through the first transport piece to be heated, the temperature of the homogeneous liquid is higher at the moment and is in an environment with higher pressure, the heated homogeneous liquid is transported to the crystallization device through the third transport piece, the homogeneous liquid enters a low-pressure environment from a high-pressure environment, the homogeneous liquid is subjected to flash evaporation through sudden pressure drop, concentration treatment is carried out, concentrated liquid is obtained, meanwhile, the temperature of steam generated by the concentration treatment is higher, the steam is transported to the second heat exchange device through the second transport piece to heat the homogeneous liquid in the second heat exchange device, the cyclic utilization of heat is realized, and the heat in the wastewater treatment process is fully utilized. And (4) the concentrated solution enters a solid-liquid separation device for solid-liquid separation treatment to obtain solid salt, and the salt in the salt-containing wastewater is removed.
According to the salt-containing wastewater cyclic treatment method, heat can be recycled in the salt-containing wastewater treatment process, the heat in the wastewater treatment process is fully utilized, and the salt in the wastewater is effectively removed.
Drawings
FIG. 1 is a schematic structural diagram of a saline wastewater recycling system according to an embodiment of the present invention.
The notation in the figure is:
10. a salt-containing wastewater circulating treatment system; 101. a pretreatment device; 10101. a precipitation device; 10102. a pretreatment liquid tank; 102. a first heat exchange means; 103. a crystallization device; 10301. a defogging device; 104. a solid-liquid separation device; 105. a second heat exchange means; 106. a first transfer member; 107. a second transfer member; 108. a third transfer member; 109. a fourth transfer member; 1010. a steam pressure increasing device; 1011. a distilled water tank; 1012. an exhaust gas condensing device; 1013. a vapor generating device; 1014. a pretreatment liquid pump; 1015. a distilled water pump; 1016. A circulation pump; 1017. a concentrate pump; 1018. a mother liquor tank; 1019. a stirrer; 1020. and (4) a mother liquor pump.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "bottom", "inner", "outer", etc. in the present invention are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a salt-containing wastewater recycling treatment system 10, which includes a pretreatment device 101, a first heat exchange device 102, a crystallization device 103, and a solid-liquid separation device 104, which are connected in sequence; and a second heat exchange device 105 connected with the crystallization device 103. A first transfer member 106 is connected between the crystallization device 103 and the second heat exchange device 105 for transferring the liquid generated in the crystallization device 103 to the second heat exchange device 105 for heating. A second transfer part 107 is further connected between the crystallization device 103 and the second heat exchange device 105 for transferring the vapor generated in the crystallization device 103 to the second heat exchange device 105 to heat the liquid in the second heat exchange device 105. A third transfer member 108 is connected between the crystallization device 103 and the second heat exchange device 105 for transferring the liquid heated by the second heat exchange device 105 to the crystallization device 103.
When the treatment system in the embodiment is adopted to treat the saline wastewater, the waste liquid to be treated is pretreated by the pretreatment device 101 to obtain a pretreatment liquid; the pretreatment liquid is heated by the first heat exchange device 102 to obtain a preheating liquid. Then the preheated liquid enters a crystallizing device 103 for homogenization treatment to obtain a homogenized liquid. Then the homogeneous liquid is transferred to the second heat exchange device 105 through the first transfer part 106 to be heated, the temperature of the homogeneous liquid is higher and the homogeneous liquid is in an environment with higher pressure, the heated homogeneous liquid is transferred to the crystallization device 103 through the third transfer part 108, the homogeneous liquid enters a low-pressure environment from a high-pressure environment, the homogeneous liquid is subjected to flash evaporation due to sudden pressure drop, concentration treatment is performed to obtain a concentrated liquid, meanwhile, the temperature of steam generated by the concentration treatment is higher, the steam is transferred to the second heat exchange device 105 through the second transfer part 107 to heat the homogeneous liquid in the second heat exchange device 105, the cyclic utilization of heat is realized, and the heat in the wastewater treatment process is fully utilized. The concentrated solution enters a solid-liquid separation device 104 for solid-liquid separation treatment to obtain solid salt, and the salt in the salt-containing wastewater is removed.
In a specific example, the concentrated solution in the crystallization device 103 is transferred to the solid-liquid separation device 104 by a concentrated solution pump 1017, and the liquid obtained by the solid-liquid separation device 104 is temporarily stored by a mother liquor tank 1018. Preferably, a stirrer 1019 is provided in the mother liquor tank 1018, the stirrer 1019 keeps the liquid in the mother liquor tank 1018 in a uniform state, and then the liquid in the mother liquor tank 1018 is transferred to the crystallization device 103 by the mother liquor pump 1020 to continue the circulation.
As for the selection of the crystallization apparatus 103, a salt leg crystallization apparatus may be employed. The preheated liquid heated by the first heat exchanger 102 enters the crystallizer 103. Preferably, the preheating liquid tangentially enters an upper laminar bed of the salt leg crystallizer, and fine salt crystals are fully dissolved in the preheating liquid through solid-liquid fluidization to obtain a homogeneous liquid.
In a specific example, the saline wastewater recycling system 10 further comprises a steam pressurizing device 1010, and the steam pressurizing device 1010 is arranged on the first transfer member 106 and is used for pressurizing steam transferred out of the crystallization device 103.
In a specific example, the brine wastewater recycling system 10 further comprises a steam temperature raising device (not shown in the figure) which is arranged on the first transfer member 106 and is used for raising the temperature of the steam transferred out of the crystallization device 103.
Carry out pressure boost and/or intensification through vapour pressure boost device 1010 and/or vapour rising temperature device to the vapour of transporting out in the crystallization device 103, make in the second heat transfer device 105 to the heating of homogeneity liquid more abundant, be convenient for heat the homogeneity liquid to required temperature, and then make the flash distillation of homogeneity liquid in crystallization device 103 more abundant, improve the efficiency of getting rid of salinity in the waste water.
Preferably, the flow velocity of the homogeneous liquid in the second heat exchange device 105 is 1.5m/s to 3.5m/s, and within the flow velocity range, the scaling probability of the homogeneous liquid can be effectively reduced, and the heat exchange efficiency is prevented from being affected by scaling of the homogeneous liquid. Further, in this flow rate range, the ambient pressure of the homogeneous liquid is lower than the saturated vapor pressure of the homogeneous liquid at the temperature in cooperation with the vapor discharged from the crystallization device 103 as a heat source, and the homogeneous liquid is prevented from boiling in the second heat exchanger 105, which in turn affects the heat exchange efficiency. Further preferably, the homogeneous liquid is transferred from the crystallization device 103 to the second heat exchange device 105 by using a circulation pump 1016. More preferably, the circulating pump 1016 is controlled by frequency conversion, the system is started initially to run, the TDS (total dissolved solids) of the homogeneous liquid is low, the specific gravity is low, the frequency is automatically adjusted within the range of 0-50 Hz according to the automatic detection of the specific gravity and the outlet pressure, and the requirement of the circulating flow of the homogeneous liquid is met.
As a specific example of the present invention, the saline wastewater recycling system 10 further includes a fourth transfer member 109; the fourth transfer member 109 is connected between the crystallization device 103 and the solid-liquid separation device 104, and is used for transferring the liquid separated in the solid-liquid separation device 104 to the crystallization device 103. The liquid separated from the solid-liquid separation device 104 is transferred to the crystallization device 103 through the fourth transfer member 109 for further cyclic crystallization, so that the removal rate of salt in the wastewater is improved.
In one specific example, the crystallization device 103 is provided with a demisting device 10301 inside, and the demisting device 10301 is connected to the inner wall of the crystallization device 103 for demisting the vapor generated in the crystallization device 103. Further, a demisting device 10301 is connected to the inner wall of the crystallization device 103 and the demisting device 10301 is near the connection end of the second transfer member 107 and the crystallization device 103 for demisting the vapor generated in the crystallization device 103. The demister 10301 can purify the steam and prevent the steam from corroding, blocking and other adverse effects on the second heat exchanger 105 in the heat exchange process of the second heat exchanger 105. Preferably, the mist eliminator 10301 comprises two layers of mist eliminators, one layer being a flap mist eliminator and the other layer being a wire mesh mist eliminator.
As another specific example of the present invention, the brine wastewater recycling treatment system 10 further comprises a liquid storage device connected with the second heat exchanging device 105 for storing the liquid generated by heat exchange in the second heat exchanging device 105. The vapor in the second heat exchange device 105 is condensed to generate liquid after heat exchange, and the liquid has higher temperature and is transported to the liquid storage device, so that the liquid is further recycled.
In one specific example, the reservoir is coupled to first heat exchange device 102 to enable transfer of liquid in the reservoir to first heat exchange device 102. The liquid in the liquid outlet device has higher temperature, and the liquid is conveyed to the first heat exchange device 102, so that a heat source can be provided for the heat exchange of the first heat exchange device 102. Specifically, in the wastewater treatment process, the pretreatment liquid after the pretreatment can be subjected to a preheating treatment.
In one particular example, the reservoir is coupled to the crystallization device 103 to effect transport of vapor generated in the reservoir to the crystallization device 103. The liquid transferred into the liquid storage device by the second heat exchange device 105 has higher temperature, when the liquid is transferred into the liquid storage device, part of the liquid is evaporated to form steam, the part of the steam also has higher heat, and the part of the steam is connected with the crystallization device 103 through the liquid storage device, can be introduced into the crystallization device 103, provides a heat source for the crystallization device 103, and further improves the utilization rate of the heat in the wastewater treatment process.
Referring to fig. 1, in the embodiment, the liquid storage device is a distilled water tank 1011, and the steam in the second heat exchanging device 105 of the second heat exchanging device 105 is condensed after heat exchanging to generate distilled water to be transported to the distilled water tank 1011. And the distilled water in distilled water tank 1011 is transferred to first heat exchange means 102 by distilled water pump 1015.
In a specific example, the pretreatment device 101 includes a precipitation device 10101, and the precipitation device 10101 is used for performing precipitation treatment on waste liquid to be treated. The precipitation device 10101 is connected to the first heat exchange device 102, and transfers the supernatant after precipitation to the first heat exchange device 102. The wastewater to be treated is subjected to precipitation treatment through a precipitation device 10101, and solids obtained by precipitation are treated in modes of packaging and the like. Supernatant obtained by precipitation enters the first heat exchange device 102 to start circulation treatment.
In this embodiment, the pretreatment device 101 includes a precipitation device 10101 and a pretreatment liquid tank 10102, and the pretreatment liquid is obtained after passing through the precipitation device 10101, and enters the pretreatment liquid tank 10102, and then is transferred to the first heat exchange device 102 by a pretreatment liquid pump 1014.
In a specific example, the brine wastewater recycling treatment system 10 further comprises an exhaust gas condensing device 1012, and the exhaust gas condensing device 1012 is connected with the second heat exchange device 105 to condense vapor generated in the second heat exchange device 105 and then discharge impurity gas. Preferably, the liquid storage device is connected with the exhaust gas condensation device 1012 for receiving the liquid generated by the exhaust gas condensation device 1012. In the wastewater treatment process, the steam discharged from the crystallization device 103 contains some non-condensable gases, such as nitrogen, carbon dioxide, etc., and these non-condensable gases are impurity gases existing in the steam, and the existence of these impurity gases can have certain influence on the treatment conditions of the system in the wastewater treatment process, which affects the precise control of the treatment system. For example, the presence of these contaminant gases can affect the pressure level of the processing system, making it difficult to accurately control the pressure in the processing system. In this embodiment, by the arrangement of the exhaust condensing device 1012, the vapor containing the impurity gas enters the exhaust condensing device 1012, and at this time, the water vapor is condensed, but the impurity gas is not condensed, so that the impurity gas can be partially exhausted, and the condensable liquid can be collected. In addition, the liquid storage device is connected with the exhaust gas condensation device 1012, so that the liquid condensed by the exhaust gas condensation device 1012 can enter the liquid storage device for further recycling. As shown in fig. 1, in the present embodiment, the distilled water condensed by the exhaust gas condensing device 1012 is transferred to the distilled water tank 1011 for storage and subsequent recycling.
In a specific example, the exhaust steam condensing device is connected with the first heat exchange device 102 to remove impurity gases in the preheating liquid after being heated by the first heat exchange device 102.
In a specific example, the salt-containing wastewater recycling system 10 further comprises a steam generation device 1013, and the steam generation device 1013 is connected with the crystallization device 103 for providing a heat source for the crystallization device 103. When the treatment system starts to operate, a heat source is supplied to the crystallization device 103 through the steam generation device 1013 so that the treatment system can start to operate normally. In addition, when the treatment system needs to supplement heat temporarily in the working process, heat can be supplied to the system in time through the steam generating device 1013, and the normal operation of the system is ensured.
In yet another embodiment of the present invention, an ammonium salt-containing wastewater recycling system is provided, which comprises the saline wastewater recycling system 10 in any of the above examples or embodiments.
In yet another embodiment of the present invention, an ammonium salt-containing wastewater recycling system is provided, and the ammonium salt-containing wastewater recycling system is the saline wastewater recycling system 10 in any of the above examples or embodiments.
In yet another embodiment of the present invention, a wastewater recycling system with salt content including ammonium fluoride and ammonium chloride is provided, which comprises the wastewater recycling system 10 with salt content in any of the above examples or embodiments.
In yet another embodiment of the present invention, there is provided a wastewater recycling system having salt content including ammonium fluoride and ammonium chloride, wherein the wastewater recycling system having salt content including ammonium fluoride and ammonium chloride is the wastewater recycling system 10 having salt content according to any of the above-mentioned examples or embodiments.
In yet another embodiment of the present invention, a wastewater recycling system with salts of ammonium fluoride and ammonium chloride is provided, which includes the wastewater recycling system 10 with salts in any of the above-mentioned examples or embodiments.
In yet another embodiment of the present invention, there is provided a recycling system for wastewater containing ammonium fluoride and ammonium chloride, which is the recycling system 10 for wastewater containing salt in any of the above-mentioned examples or embodiments.
Another embodiment of the present invention provides a method for circularly treating salt-containing wastewater, in which the system 10 for circularly treating salt-containing wastewater is adopted, and the method for circularly treating salt-containing wastewater includes the following steps:
pretreating the waste liquid to be treated by a pretreatment device 101 to obtain a pretreatment liquid; the pretreatment liquid is heated by a first heat exchange device 102 to obtain a preheating liquid; the preheating liquid enters a crystallizing device 103 for homogenization treatment to obtain a homogeneous liquid; the homogeneous liquid is transported to the second heat exchange device 105 through the first transport member 106 to be heated, the heated homogeneous liquid is transported to the crystallization device 103 through the third transport member 108 to be concentrated to obtain a concentrated liquid, and steam generated by the concentration treatment is transported to the second heat exchange device 105 through the second transport member 107 to heat the homogeneous liquid in the second heat exchange device 105; the concentrated solution is sent to a solid-liquid separation device 104 for solid-liquid separation treatment.
Preferably, the method for circularly treating the salt-containing wastewater further comprises the following steps: the vapor produced by the concentration process is pressurized and/or warmed before being transferred to second heat exchange means 105.
Specifically, the method for pretreating the waste liquid to be treated by the pretreatment device 101 comprises the following steps: the waste liquid to be treated is mixed with a precipitant in the pretreatment device 101, and after precipitation, a pretreatment liquid is obtained.
In a further embodiment of the present invention, there is provided a method for recycling wastewater containing ammonium salt, wherein the method for recycling wastewater containing ammonium salt includes the method for recycling wastewater containing salt in any of the above examples or embodiments.
In a further embodiment of the present invention, there is provided a method for recycling wastewater containing ammonium salt, wherein the method for recycling wastewater containing ammonium salt is the method for recycling wastewater containing salt in any of the above examples or embodiments.
In a further embodiment of the present invention, there is provided a method for recycling wastewater containing salts including ammonium fluoride and ammonium chloride, including any of the above-described examples or embodiments. When the salt includes ammonium fluoride and ammonium chloride, the precipitating agent may be calcium chloride.
In a further embodiment of the present invention, there is provided a method for recycling wastewater containing salts including ammonium fluoride and ammonium chloride, wherein the method for recycling wastewater containing salts including ammonium fluoride and ammonium chloride is the method for recycling wastewater containing salts in any of the above examples or embodiments. When the salt includes ammonium fluoride and ammonium chloride, the precipitating agent may be calcium chloride.
In a further embodiment of the present invention, there is provided a method for recycling wastewater having salts of ammonium fluoride and ammonium chloride, including any of the above-mentioned examples or embodiments. When the salt is ammonium fluoride and ammonium chloride, calcium chloride can be selected as the precipitating agent.
In a further embodiment of the present invention, there is provided a method for recycling wastewater having salts of ammonium fluoride and ammonium chloride, which is the method for recycling wastewater having salts of ammonium fluoride and ammonium chloride according to any of the above examples or embodiments. When the salt is ammonium fluoride and ammonium chloride, calcium chloride can be selected as the precipitating agent.
The following are specific examples.
Example 1
In this embodiment, by monitoring the wastewater to be treated, it is shown that the salts in the wastewater to be treated in this embodiment are ammonium fluoride and ammonium chloride, and the mass concentration of ammonium fluoride and the mass concentration of ammonium chloride in the wastewater are 4% and 4%, respectively. Calcium fluoride precipitates are obtained by adding calcium chloride into the precipitation device 10101 to react with the wastewater, and the calcium fluoride precipitates are taken out and packaged for sale or used in other processes. After removing fluorine ions, a pretreatment solution is obtained, and salt in the pretreatment solution exists as ammonium chloride.
The pretreatment liquid enters a pretreatment liquid tank 10102 for temporary storage, is transferred to the first heat exchange device 102 through a pretreatment liquid pump 1014, and exchanges heat in the first heat exchange device 102 to form a preheating liquid. The preheated liquid passes through an exhaust gas condenser 1012 to remove impurity gases from the preheated liquid. Then, the preheating solution enters a crystallization device 103 for homogenization treatment to obtain a homogeneous solution; the homogeneous liquid is transported to the second heat exchange device 105 through the first transport member 106 to be heated, the heated homogeneous liquid is transported to the crystallization device 103 through the third transport member 108 to be concentrated to obtain a concentrated liquid, and steam generated by the concentration treatment is transported to the second heat exchange device 105 through the second transport member 107 to heat the homogeneous liquid in the second heat exchange device 105. The vapor in the crystallization device 103 is pressurized and heated by a vapor pressurization device 1010 (the vapor pressurization device 1010 is a compressor), and then enters the second heat exchange device 105. The water vapor generated in the second heat exchange device 105 enters the distilled water tank 1011, and the distilled water in the distilled water tank 1011 enters the first heat exchange device 102 through the distilled water pump 1015 to provide a heat source for heat exchange of the pretreatment liquid. In the process, the heat can be recycled.
During the circulation treatment, the homogeneous liquid in the crystallization device 103 is transferred to the second heat exchange device 105 by the circulation pump 1016. The concentrated solution is transferred to the solid-liquid separation device 104 by the concentrated solution pump 1017 (the solid-liquid separation device 104 is a centrifuge). The liquid obtained by the centrifuge is temporarily stored in a mother liquor tank 1018 and kept uniform by a stirrer 1019, and the liquid in the mother liquor tank 1018 enters the crystallizing device 103 through a mother liquor pump 1020 to continue circulation. Packing the solid sodium chloride obtained by the centrifuge. The treatment of the wastewater in this example was completed.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (14)
1. The utility model provides a contain salt waste water circulation processing system which characterized in that: the device comprises a pretreatment device, a first heat exchange device, a crystallization device and a solid-liquid separation device which are connected in sequence; the second heat exchange device is connected with the crystallization device;
a first transfer piece is connected between the crystallization device and the second heat exchange device and used for transferring liquid generated in the crystallization device to the second heat exchange device for heating;
a second transfer piece is connected between the crystallization device and the second heat exchange device and is used for transferring vapor generated in the crystallization device to the second heat exchange device so as to heat liquid in the second heat exchange device;
and a third transfer piece is connected between the crystallization device and the second heat exchange device and is used for transferring the liquid heated by the second heat exchange device to the crystallization device.
2. The recycling system for wastewater containing salt according to claim 1, characterized in that: the device also comprises a steam pressurizing device which is arranged on the first transfer piece and is used for pressurizing the steam transferred from the crystallization device; and/or the presence of a gas in the gas,
still include vapour rising temperature device, vapour rising temperature device locates in order to be used for on the first transportation piece to the vapour of transporting out in the crystallization device heaies up.
3. The recycling system for wastewater containing salt according to claim 1, characterized in that: a fourth transfer member is also included; the fourth transfer part is connected between the crystallization device and the solid-liquid separation device, so that the liquid separated from the solid-liquid separation device is transferred to the crystallization device.
4. The recycling system for wastewater containing salt according to claim 1, characterized in that: and a demisting device is arranged in the crystallization device and connected to the inner wall of the crystallization device so as to demist steam generated in the crystallization device.
5. The recycling treatment system for wastewater containing salt according to any one of claims 1 to 4, characterized in that: the liquid storage device is connected with the second heat exchange device and used for storing liquid generated by heat exchange in the second heat exchange device.
6. The recycling system for wastewater containing salt according to claim 5, characterized in that: the liquid storage device is connected with the first heat exchange device so as to transport liquid in the liquid storage device to the first heat exchange device.
7. The recycling system for wastewater containing salt according to claim 5, characterized in that: the liquid storage device is connected with the crystallization device to realize the transportation of the vapor generated in the liquid storage device to the crystallization device.
8. The recycling system for wastewater containing salt according to claim 5, characterized in that: the exhaust gas condensing device is connected with the second heat exchange device so as to discharge impurity gas after the steam generated in the second heat exchange device is condensed.
9. The recycling system for wastewater containing salt according to claim 8, characterized in that: the liquid storage device is connected with the exhaust gas condensing device and used for receiving liquid generated by the exhaust gas condensing device.
10. The recycling treatment system for wastewater containing salt according to any one of claims 1 to 4, characterized in that: the device also comprises a steam generating device which is connected with the crystallizing device and is used for providing a heat source for the crystallizing device.
11. The recycling treatment system for wastewater containing salt according to any one of claims 1 to 4, characterized in that: the pretreatment device comprises a precipitation device, and the precipitation device is used for performing precipitation treatment on waste liquid to be treated.
12. A method for circularly treating salt-containing wastewater is characterized by comprising the following steps: the recycling treatment system for the salt-containing wastewater as claimed in any one of claims 1-11 is adopted, and the recycling treatment method for the salt-containing wastewater comprises the following steps:
pretreating the waste liquid to be treated by the pretreatment device to obtain a pretreatment liquid;
heating the pretreatment liquid by the first heat exchange device to obtain a preheating liquid;
the preheating liquid enters the crystallization device for homogenization treatment to obtain a homogeneous liquid;
the homogeneous liquid is transported to the second heat exchange device through the first transport piece to be heated, the heated homogeneous liquid is transported to the crystallization device through the third transport piece to be concentrated to obtain a concentrated liquid, and steam generated by the concentration treatment is transported to the second heat exchange device through the second transport piece to heat the homogeneous liquid in the second heat exchange device;
and the concentrated solution enters the solid-liquid separation device for solid-liquid separation treatment.
13. The method for recycling salt-containing wastewater according to claim 12, wherein: also comprises the following steps: and pressurizing and/or heating the vapor generated by the concentration treatment before the vapor generated by the concentration treatment is transferred to the second heat exchange device.
14. The recycling method of wastewater containing salt according to any one of claims 12 to 13, characterized in that: the method for pretreating the waste liquid to be treated by the pretreatment device comprises the following steps: and mixing the waste liquid to be treated with a precipitator in the pretreatment device, and precipitating to obtain a pretreatment liquid.
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