CN215049427U - Contain salt effluent treatment plant - Google Patents

Contain salt effluent treatment plant Download PDF

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Publication number
CN215049427U
CN215049427U CN202120657854.2U CN202120657854U CN215049427U CN 215049427 U CN215049427 U CN 215049427U CN 202120657854 U CN202120657854 U CN 202120657854U CN 215049427 U CN215049427 U CN 215049427U
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unit
control valve
pipeline
oxidation reactor
inlet
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CN202120657854.2U
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周波
李启国
苟华
陈勇
李春雷
叶照金
张鹏
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Chongqing Casin Environmental Resources Co ltd
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Chongqing Casin Environmental Resources Co ltd
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Abstract

The utility model provides a salt-containing wastewater treatment device, which comprises an oxidation reactor, an oxidant dosing unit, an acid regulator dosing unit, an alkaline regulator dosing unit, a first separator and an evaporative crystallizer, wherein the oxidation reactor is provided with a wastewater inlet, and a first pH value acquisition unit is arranged in the oxidation reactor; the oxidizing agent dosing unit, the acid regulator dosing unit and the alkaline regulator dosing unit are respectively connected with a pipeline of the oxidation reactor, an outlet of the oxidation reactor is connected with an inlet pipeline of the first separator, a liquid outlet of the first separator is connected with an inlet pipeline of the evaporative crystallizer, and a condensate outlet of the evaporative crystallizer is connected to a sewage discharge pipeline or a production water pipeline. This contain salt effluent treatment plant adopts the mode of oxidation + crystallization to carry out the pretreatment to containing salt waste water, through the oxidative degradation organic matter, reduces the organic matter and enriches in the evaporation process, and then improves evaporation efficiency, reduces the evaporation mother liquor volume, and inorganic salt in the abundant separation waste water realizes the waste water zero release.

Description

Contain salt effluent treatment plant
Technical Field
The utility model relates to a waste water treatment field, concretely relates to contain salt effluent treatment plant.
Background
A large amount of salt-containing wastewater is often generated in the industrial production processes of chemical industry, food, medicine, pesticide and the like, the wastewater usually contains a certain amount of organic matters, chlorate, sulfate, phosphate and the like, COD (chemical oxygen demand) of the wastewater is 1000-100000mg/L, the salt content is 3% -30%, and the wastewater contains 200-10000mg/L of fluoride, calcium, magnesium, aluminum, iron and other metal ions. Most of the components have corrosiveness and deep color, and are complex in components and difficult to recycle; the discharge amount is large, so that water resources are wasted; and the waste water is toxic and harmful, and can cause great harm to human health and environment.
At present, the salt-containing wastewater is mainly treated by a biochemical method, membrane separation, evaporation and incineration. The biochemical method is suitable for wastewater with the salt content of less than 1.5 percent, partial organic matters are difficult to biodegrade, and the high salt content inactivates microorganisms, so that the treatment requirement cannot be met; the membrane separation is difficult to treat high COD high-salinity wastewater, the organic matters in the wastewater cause the membrane pollution to be aggravated and high-frequency cleaning is needed, the treatment efficiency is low, and the effect is not thorough; in the evaporation process, the evaporation efficiency is reduced due to concentration and enrichment of organic matters, a large amount of evaporation mother liquor is generated, the salt crystal size is poor, separation is difficult, and the calcium and magnesium hardness is easy to cause scaling of an evaporator so as to reduce the heat transfer efficiency; the incineration treatment needs additional fuel due to low heat value of the waste water, so that the energy consumption is high, the economy is poor, and meanwhile, the waste water has high sulfur and chlorine contents, the equipment is seriously corroded, and the treatment of large amount of tail gas is difficult.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects existing in the prior art, the utility model aims to provide a salt-containing wastewater treatment device.
In order to realize the above purpose of the utility model, the utility model provides a salt-containing wastewater treatment device, which comprises an oxidation reactor, an oxidant dosing unit, an acid regulator dosing unit, an alkaline regulator dosing unit, a first separator and an evaporative crystallizer, wherein the oxidation reactor is provided with a wastewater inlet, and a first pH value acquisition unit is arranged in the oxidation reactor;
the first pH value acquisition unit is connected with a pH value signal input end of the control unit, the oxidant dosing unit, the acid regulator dosing unit and the alkaline regulator dosing unit are respectively connected with a pipeline of the oxidation reactor, a first control valve unit is arranged on a connecting pipeline of the oxidant dosing unit and the oxidation reactor, a second control valve unit is arranged on a connecting pipeline of the acid regulator dosing unit and the oxidation reactor, a third control valve unit is arranged on a connecting pipeline of the alkaline regulator dosing unit and the oxidation reactor, an outlet of the oxidation reactor is connected with an inlet pipeline of the first separator, a fourth control valve is arranged on the pipeline, a liquid outlet of the first separator is connected with an inlet pipeline of the evaporation crystallizer, and an outlet of the evaporation condensate is connected to a sewage discharge pipeline or a production water pipeline, the pipeline is provided with a fifth control valve unit, the control end of each control valve switch is respectively connected with the control unit, and the control unit controls the second control valve unit and the third control valve unit not to be opened at the same time.
This contain salt effluent treatment plant adopts the mode of oxidation + crystallization to carry out the pretreatment to containing salt waste water, through the oxidative degradation organic matter, reduces the organic matter and enriches in the evaporation process, and then improves evaporation efficiency, reduces the evaporation mother liquor volume, and inorganic salt in the abundant separation waste water realizes the waste water zero release.
Preferred embodiments of the present application: the salt-containing wastewater treatment device also comprises a precipitation reactor and a precipitant dosing unit, wherein a second pH value acquisition unit is arranged in the precipitation reactor, and the signal output end of the second pH value acquisition unit is connected with the other pH value signal input end of the control unit;
the acid regulator dosing unit is connected with the pipeline of the precipitation reactor, a sixth control valve unit is arranged on the connecting pipeline of the acid regulator dosing unit and the precipitation reactor, the alkaline regulator dosing unit is connected with the pipeline of the precipitation reactor, the pipeline is provided with a seventh control valve unit, the precipitant dosing unit is connected with the pipeline of the precipitation reactor, the pipeline is provided with an eighth control valve unit, the outlet of the oxidation reactor is connected with the inlet pipeline of the precipitation reactor, a ninth control valve is arranged on the pipeline, the outlet of the precipitation reactor is connected with the inlet pipeline of the first separator, the pipeline is provided with a tenth control valve, the switch control ends of the fifth control valve unit, the sixth control valve unit, the seventh control valve unit, the eighth control valve unit, the ninth control valve unit and the tenth control valve are respectively connected with the control unit, and the control unit controls the sixth control valve unit and the seventh control valve unit not to be opened at the same time.
The precipitation reactor removes heavy metals such as calcium, magnesium, aluminum, iron and the like and fluorides through chemical precipitation, and reduces scaling and corrosion of evaporation equipment.
Preferred embodiments of the present application: the salt-containing wastewater treatment device further comprises a flocculating agent dosing unit, the flocculating agent dosing unit is connected with the pipeline of the precipitation reactor, an eleventh control valve unit is arranged on the pipeline, and the switch control end of the eleventh control valve unit is connected with the control unit. The insoluble solid precipitate is coagulated into large-particle alum flocs, which is convenient for solid-liquid separation.
Preferred embodiments of the present application: the liquid outlet of the first separator is connected with the liquid inlet pipeline of a filter, and the liquid outlet of the filter is connected with the inlet pipeline of the evaporative crystallizer.
Preferred embodiments of the present application: the concentrated solution outlet of the evaporation crystallizer is connected with a liquid inlet pipeline of a thickener, a first outlet of the thickener is connected with an inlet of a second separator, a second outlet of the thickener is connected with an inlet of a freezing crystallizer, an outlet of the freezing crystallizer is connected with an inlet pipeline of the second separator, a twelfth control valve is arranged on the pipeline, and an on-off control end of the twelfth control valve is connected with the control unit.
Preferred embodiments of the present application: and the liquid outlet of the second separator is connected with the inlet of the evaporative crystallizer.
Preferred embodiments of the present application: the liquid outlet of the second separator is connected to the inlet of the oxidation reactor.
Preferred embodiments of the present application: the oxidation reactor and the precipitation reactor are both of a cylindrical conical bottom structure, a mechanical stirring device is arranged in the oxidation reactor, and a cooling coil is arranged in the oxidation reactor.
Preferred embodiments of the present application: the evaporative crystallizer comprises a double-effect evaporator and a forced circulation evaporator, a liquid outlet of the first separator is respectively connected with an inlet of the double-effect evaporator and an inlet of the forced circulation evaporator, and an outlet of the double-effect evaporator is connected with an inlet of the forced circulation evaporator.
Preferred embodiments of the present application: the freezing crystallizer is one of a jacketed crystallizer, an Oslo crystallizer and a DTB crystallizer.
The utility model has the advantages that:
(1) the application is applicable to different quality of water and contains salt waste water treatment, and the flexible operation, the desalination is high, but the full water recovery resource, and no evaporation mother liquor produces, realizes the waste water zero release.
(2) The pretreatment of oxidation, precipitation and separation is carried out, intermittent operation is adopted, the process route can be flexibly selected and the process conditions can be controlled according to the water quality and the treatment requirement of the wastewater, and the treatment efficiency is improved. The content of organic matters, metal ions and fluorine ions is reduced through pretreatment, the risk that the evaporation efficiency is reduced by the enrichment of the organic matters in the evaporation process, the crystal size is poor and the evaporator is scaled is effectively avoided, the desalting effect is improved, and the energy consumption is effectively reduced.
(3) The method adopts a mode of combining evaporative crystallization and freezing crystallization, is continuously operated, can adapt to the crystallization requirements of different concentrations and different inorganic salt types, and improves the salt crystal size and the inorganic salt removal rate.
(4) The centrifugal mother liquor is sent to the oxidation reactor for circular treatment, so that the content of organic matters in the evaporator is effectively reduced, the boiling point increase and the evaporation efficiency reduction caused by the enrichment of the organic matters are avoided, the evaporation efficiency and the desalination rate are improved, and the evaporation energy consumption is reduced.
(5) The multi-point water inlet and cross-line connection design is adopted, the process is simple and flexible, the application range is wide, the method can be used for salt-containing wastewater treatment in various industries, and the method is particularly suitable for scenes with various salt-containing wastewater treatment requirements.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic block diagram of a salt-containing wastewater treatment apparatus.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the present embodiment provides a salt-containing wastewater treatment device, which includes an oxidation reactor, an oxidant dosing unit, an acidic regulator dosing unit, a first separator, and an evaporative crystallizer, wherein the oxidation reactor is provided with a wastewater inlet, and a first pH value acquisition unit is arranged therein.
The signal output end of the first pH value acquisition unit is connected with the pH value signal input end of the control unit, the oxidant dosing unit, the acid regulator dosing unit and the alkaline regulator dosing unit are respectively connected with a pipeline of the oxidation reactor, a first control valve unit is arranged on a connecting pipeline of the oxidant dosing unit and the oxidation reactor, a second control valve unit is arranged on a connecting pipeline of the acid regulator dosing unit and the oxidation reactor, a third control valve unit is arranged on a connecting pipeline of the alkaline regulator dosing unit and the oxidation reactor, the outlet of the oxidation reactor is connected with the inlet pipeline of the first separator, a fourth control valve is arranged on the pipeline, the liquid outlet of the first separator is connected with the inlet pipeline of the evaporation crystallizer, and the condensate outlet of the evaporation crystallizer is connected with a sewage discharge pipeline or a production water pipeline, a fifth control valve unit is provided on the pipeline.
In this embodiment, the switch control ends of the first control valve unit, the fourth control valve unit and the fifth control valve unit are respectively connected with the control unit.
The second control valve unit and the third control valve unit can be manually controlled to be opened or closed according to the pH value collected by the first pH value collecting unit and received by the control unit. The control unit may include a display screen on which the pH value is displayed.
The second control valve unit and the third control valve unit can also be controlled to be opened or closed by the control unit, and the control unit controls the second control valve unit and the third control valve unit to be opened at the same time.
Specifically, a first comparator, a second comparator and a controller are arranged in the control unit, a signal output end of the first pH value acquisition unit is respectively connected with a positive phase end of the first comparator and an inverse phase end of the second comparator, the inverse phase end of the first comparator inputs an upper limit value of a first preset pH range value, the positive phase end of the second comparator inputs a lower limit value of the first preset pH range value, an output end of the first comparator is connected with a control end of the second control valve unit, an output end of the second comparator is connected with a control end of the third control valve unit, or the output ends of the first comparator and the second comparator are respectively connected with corresponding input ends of the controller, and a control output end of the controller is connected with a control end of the second control valve unit and a control end of the third control valve unit to respectively control the second control valve unit and the third control valve unit to be opened at different times.
In the working process, salt-containing wastewater, particularly high-COD salt-containing wastewater is injected into an oxidation reactor from a wastewater inlet of the oxidation reactor, a first pH acquisition unit continuously acquires the pH value of the wastewater and sends the pH value to a control unit, in the embodiment, a first preset pH value range is preferably but not limited to 2.5-4, when the pH value acquired by the first pH acquisition unit is greater than the upper limit value 4 of the first preset pH value range, it indicates that the acid value of the wastewater is insufficient, a first comparator outputs a high level, a second comparator outputs a low level, the first comparator triggers a second control valve unit to open, or the controller controls the second control valve unit to open, and an acid regulator dosing unit adds an acid regulator into the oxidation reactor; when the pH value acquired by the first pH acquisition unit is less than the lower limit value of the first preset pH value range by 2.5, the first comparator outputs a low level, the second comparator outputs a high level, the second comparator triggers the third control valve unit to open, or the controller controls the third control valve unit to open, and the alkaline regulator dosing unit adds an alkaline regulator into the oxidation reactor; when the pH value acquired by the first pH acquisition unit is between the upper limit value and the lower limit value of the first preset pH value range, the first comparator outputs a low level, the second comparator outputs a low level, and the second control valve unit and the third control valve unit are closed; the controller controls the first control valve unit to be opened, the oxidant dosing unit adds an oxidant into the oxidation reactor, after the reaction in the oxidation reactor is finished, the controller controls the fourth control valve to be opened, the sewage enters the first separator from the outlet of the oxidation reactor, the first separator is preferably but not limited to a filter press, after the filter press filters and squeezes the solid into mud cakes, the liquid flows into the evaporation and concentration device after the solid is further removed by the filter, the evaporation and concentration are carried out, salt is crystallized and separated out along with the evaporation of water in the crystallizer, the organic matter is concentrated and enriched to form concentrated solution, a condenser is arranged on the evaporation crystallizer, the steam is condensed by the condenser to form condensed liquid, and the condensed liquid can be reused for production or discharged to a sewage station as required.
The regulator in the acidity regulating dosing unit includes, but is not limited to, one or any combination of hydrochloric acid, sulfuric acid and nitric acid. Therefore, in this embodiment, at least two pipelines are connected between the acid regulator dosing unit and the oxidation reactor, and each pipeline is provided with a control valve, so that the second control valve unit includes at least two control valves, and the controller controls the second control valve unit to be opened or closed simultaneously, or to be opened or closed according to a set sequence. The alkaline regulator is mostly liquid alkali, at least two kinds of liquid alkali are generally adopted for regulation, so at least two pipelines are connected between the alkaline regulator dosing unit and the oxidation reactor, and each pipeline is provided with a control valve. The oxidant from the oxidant dosing unit is one or a mixture of any combination of hydrogen peroxide, ferrous sulfate, nitric acid and sodium hypochlorite, and the oxidant is dosed in a batch and quantitative manner. In this embodiment, the oxidation reaction time can be controlled in the unit, and/or ORP and COD detection can be assisted, when the oxidation reaction time reaches the preset oxidation reaction time, the ORP and COD detection values reach the set requirements, and the reaction in the oxidation reactor is completed, which is the prior art and will not be described herein.
In order to further guarantee the effect of containing salt waste water treatment, this embodiment has the preferred scheme: the salt-containing wastewater treatment device further comprises a precipitation reactor and a precipitant feeding unit, wherein the acidity regulator feeding unit is connected with a pipeline of the precipitation reactor, a sixth control valve unit is arranged on a connecting pipeline of the acidity regulator feeding unit, the alkalinity regulator feeding unit is connected with a pipeline of the precipitation reactor, a seventh control valve unit is arranged on the pipeline, the precipitant feeding unit is connected with a pipeline of the precipitation reactor, an eighth control valve unit is arranged on the pipeline, an outlet of the oxidation reactor is connected with an inlet pipeline of the precipitation reactor, a ninth control valve is arranged on the pipeline, an outlet of the precipitation reactor is connected with an inlet pipeline of the first separator, and a tenth control valve is arranged on the pipeline. And the switch control ends of the fifth control valve unit, the sixth control valve unit, the seventh control valve unit, the eighth control valve unit, the ninth control valve and the tenth control valve are respectively connected with the control unit, and the control unit controls the sixth control valve unit and the seventh control valve unit not to be opened at the same time.
And a second pH value acquisition unit is arranged in the precipitation reactor. A signal output end of the second pH value acquisition unit is connected with another pH value signal input end of the control unit, specifically, a third comparator and a fourth comparator are arranged in the control unit, a signal output end of the second pH value acquisition unit is connected with an anode end of the third comparator and an inverter end of the fourth comparator, an inverter end of the third comparator inputs an upper limit value of a second preset pH range value, an input end of the fourth comparator inputs a lower limit value of the second preset pH range value, an output end of the third comparator is connected with a control end of the sixth control valve unit, an output end of the fourth comparator is connected with a control end of the seventh control valve unit, or an output end of the third comparator and an output end of the fourth comparator are respectively connected with corresponding input ends of the controllers, and a control output end of the controllers is connected with a control end of the sixth control valve unit and a control end of the seventh control valve unit to respectively control the sixth control valve unit, The seventh control valve unit is not opened at the same time.
In the preferable scheme, the salt-containing wastewater treatment device further comprises a flocculant dosing unit, the flocculant dosing unit is connected with a pipeline of the precipitation reactor, an eleventh control valve unit is arranged on the pipeline, and the switch control end of the eleventh control valve unit is connected with the control unit.
After the reaction in the oxidation reactor is finished, the controller of the control unit controls the ninth control valve to be opened, the oxidized sewage flows into the precipitation reactor, and the second pH acquisition unit continuously acquires the pH value of the wastewater in the precipitation reactor and sends the pH value to the control unit, in the embodiment, the second preset pH value range is preferably but not limited to 8-10, when the pH value acquired by the second pH acquisition unit is greater than the upper limit value 10 of the second preset pH value range, the wastewater shows that the alkaline value is too high, the third comparator outputs a high level, the fourth comparator outputs a low level, the third comparator triggers the sixth control valve unit to be opened, or the controller controls the sixth control valve unit to be opened, and the acid regulator dosing unit adds the acid regulator into the precipitation reactor; when the pH value acquired by the second pH acquisition unit is smaller than the lower limit value 8 of the second preset pH value range, the alkaline value of the wastewater is insufficient, the third comparator outputs a low level, the fourth comparator outputs a high level, the fourth comparator triggers the seventh control valve unit to open, or the controller controls the seventh control valve unit to open, and the alkaline regulator dosing unit adds an alkaline regulator into the precipitation reactor; when the pH value acquired by the second pH acquisition unit is between the upper limit value and the lower limit value of the second preset pH value range, the third comparator outputs a low level, the fourth comparator outputs a low level, the sixth control valve unit and the seventh control valve unit are both closed, the eighth control valve unit is controlled to be opened by the controller, and the precipitating agent feeding unit adds a precipitating agent into the precipitation reactor. The precipitant of the precipitant dosing unit includes but is not limited to one or any combination of calcium hydroxide, calcium chloride, sodium carbonate and liquid alkali, and reacts with metal ions such as calcium, magnesium, aluminum, iron and the like in the wastewater and fluoride ions to generate insoluble solid precipitates. In this embodiment, at least two pipelines are connected between the acidity regulator dosing unit and the precipitation reactor, and each pipeline is provided with a control valve, so that the sixth control valve unit includes at least two control valves, and the controller controls the sixth control valve unit to be opened or closed simultaneously, or to be opened or closed according to a set sequence. At least two pipelines are connected between the alkaline regulator dosing unit and the precipitation reactor, and each pipeline is provided with a control valve, so that the seventh control valve unit comprises at least two control valves, the seventh control valve unit is controlled by the controller to be opened or closed simultaneously, and also can be controlled to be opened or closed according to a set sequence. Preferably, at least three precipitants are selected, so at least three pipelines are connected between the precipitant feeding unit and the precipitation reactor, and each pipeline is provided with a control valve, so that the eighth control valve unit comprises at least three control valves, and the eighth control valve unit is controlled by the controller to be opened or closed simultaneously or be opened or closed according to a set sequence. The sixth control valve unit and the seventh control valve unit can also be manually controlled to be opened or closed according to the pH value collected by the second pH value collecting unit and received by the control unit.
Then under the action of a flocculating agent from a flocculating agent dosing unit, the solid particles are coagulated into large-particle alum flocs. In this embodiment, at least two pipelines are connected between the flocculant dosing unit and the precipitation reactor, and each pipeline is provided with a control valve, so the eleventh control valve unit includes at least two control valves, and the controller controls the simultaneous opening or closing of the flocculant dosing unit, and also can control the sequential opening or closing of the flocculant dosing unit according to a setting sequence. And in the preferred scheme, the first separator is a filter press, the muddy water mixture enters the filter press and is filtered and squeezed, the solid is intercepted and squeezed into a mud cake, the liquid passes through the filter cloth, the liquid is further removed by the filter and then is sent to an evaporative crystallizer, salt is crystallized and separated out in the evaporative crystallizer along with the evaporation of water, the organic matter is concentrated and enriched to form a concentrated solution, the steam is condensed by a condenser to form a condensate, and the condensate can be reused for production or discharged to a sewage station as required.
In this embodiment, the precipitation reactor may further include a low COD wastewater inlet for treating the low COD wastewater and the oxidized sewage in the oxidation reactor in the precipitation reactor.
As the solid content in the evaporative crystallizer rises and the organic matter is concentrated and enriched to cause the great reduction of the evaporation efficiency along with the proceeding of the evaporative crystallization process, the concentrated solution outlet of the evaporative crystallizer is connected with the liquid inlet pipeline of a thickener, the first outlet of the thickener is connected with the inlet of the second separator, the second outlet of the thickener is connected with the inlet of a freezing crystallizer, the outlet of the freezing crystallizer is connected with the inlet pipeline of the second separator, the pipeline is provided with a twelfth control valve, and the switch control end of the twelfth control valve is connected with the control unit. And the liquid outlet of the second separator is connected with the inlet of the evaporative crystallizer and can also be connected with the inlet of the oxidation reactor.
In this example, the concentrated solution was sent to the second separator through a gravity settler, and was desalted by centrifugal separation. The thickener is a gravity settler, a feeding pipe extending into the middle part of the thickener is arranged at the circle center position of the top part of the thickener, a material distribution device is arranged at the lower end of the pipe, the lower part of the pipe is conical and is provided with a scraper close to the inner wall, the upper part of the pipe is provided with a sawtooth-shaped overflow weir, the upper side wall of the pipe is provided with a clear liquid overflow port, the bottom of the pipe is provided with a discharge port, the clear liquid overflow port is connected with a freezing crystallizer, and the discharge port is connected with a second separator. And the clear liquid in the thickener flows into the freezing crystallizer through a second outlet, namely a clear liquid overflow port, and indirectly exchanges heat with a refrigerant to reduce the temperature, the solubility is reduced due to the reduction of the temperature, a large amount of salt is separated out in the form of crystals, then the controller controls the twelfth control valve to be opened, and the mixed liquid containing the crystals in the freezing crystallizer is sent to the second separator through the discharge port. In this embodiment, the second separator is a centrifuge, the mixed liquid containing crystals enters the centrifuge, solid salt is separated by centrifugal separation, a part of mother liquid in the centrifugal mother liquid returns to the evaporative crystallizer for cyclic evaporation, concentration and desalination, and the other part of mother liquid is sent to the pretreatment unit to be mixed with the salt-containing wastewater or to be treated separately and then enters the crystallization unit for treatment.
In this embodiment, the control valve is preferably, but not limited to, a pneumatic valve, the oxidation reactor and the precipitation reactor are preferably, but not limited to, cylindrical conical bottom structures, a mechanical stirring device is arranged in the oxidation reactor, and a cooling coil is further arranged in the oxidation reactor. The evaporative crystallizer adopts a double-effect evaporator and a forced circulation evaporator, a liquid outlet of a first separator or a liquid outlet of a filter is respectively connected with an inlet of the double-effect evaporator and an inlet of the forced circulation evaporator, a fluid outlet of a second separator is respectively connected with an inlet of the double-effect evaporator, an inlet of the forced circulation evaporator and an inlet of an oxidation reactor, an outlet of the double-effect evaporator is connected with an inlet of the forced circulation evaporator, the double-effect evaporator and the forced circulation evaporator are connected in series for operation, or the forced circulation evaporator is operated independently, so that the desalting efficiency and the energy consumption are both considered. The freezing crystallizer is preferably but not limited to one of a jacketed crystallizer, an Oslo crystallizer, a DTB crystallizer (circulation in slurry crystallizer). The filter is preferably but not limited to one of a sand filter, a self-flushing filter, a precision filter, and the controller is preferably but not limited to using an STM32 series chip.
In this application, the flow direction of liquid can adopt the action of gravity to flow or set up the pump and carry liquid, and this is prior art, and no longer repeated in this paper.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The salt-containing wastewater treatment device is characterized by comprising an oxidation reactor, an oxidant dosing unit, an acid regulator dosing unit, an alkaline regulator dosing unit, a first separator and an evaporative crystallizer, wherein the oxidation reactor is provided with a wastewater inlet, and a first pH value acquisition unit is arranged in the oxidation reactor;
the first pH value acquisition unit is connected with a pH value signal input end of the control unit, the oxidant dosing unit, the acid regulator dosing unit and the alkaline regulator dosing unit are respectively connected with a pipeline of the oxidation reactor, a first control valve unit is arranged on a connecting pipeline of the oxidant dosing unit and the oxidation reactor, a second control valve unit is arranged on a connecting pipeline of the acid regulator dosing unit and the oxidation reactor, a third control valve unit is arranged on a connecting pipeline of the alkaline regulator dosing unit and the oxidation reactor, an outlet of the oxidation reactor is connected with an inlet pipeline of the first separator, a fourth control valve is arranged on the pipeline, a liquid outlet of the first separator is connected with an inlet pipeline of the evaporation crystallizer, and an outlet of the evaporation condensate is connected to a sewage discharge pipeline or a production water pipeline, the pipeline is provided with a fifth control valve unit, the control end of each control valve switch is respectively connected with the control unit, and the control unit controls the second control valve unit and the third control valve unit not to be opened at the same time.
2. The saline wastewater treatment device according to claim 1, further comprising a precipitation reactor and a precipitant dosing unit, wherein a second pH value acquisition unit is arranged in the precipitation reactor, and the signal output end of the second pH value acquisition unit is connected with the other pH value signal input end of the control unit;
the acid regulator dosing unit is connected with the pipeline of the precipitation reactor, a sixth control valve unit is arranged on the connecting pipeline of the acid regulator dosing unit and the precipitation reactor, the alkaline regulator dosing unit is connected with the pipeline of the precipitation reactor, the pipeline is provided with a seventh control valve unit, the precipitant dosing unit is connected with the pipeline of the precipitation reactor, the pipeline is provided with an eighth control valve unit, the outlet of the oxidation reactor is connected with the inlet pipeline of the precipitation reactor, a ninth control valve is arranged on the pipeline, the outlet of the precipitation reactor is connected with the inlet pipeline of the first separator, the pipeline is provided with a tenth control valve, the switch control ends of the fifth control valve unit, the sixth control valve unit, the seventh control valve unit, the eighth control valve unit, the ninth control valve unit and the tenth control valve are respectively connected with the control unit, and the control unit controls the sixth control valve unit and the seventh control valve unit not to be opened at the same time.
3. The salt-containing wastewater treatment device according to claim 2, further comprising a flocculant dosing unit, wherein the flocculant dosing unit is connected with the precipitation reactor through a pipeline, an eleventh control valve unit is arranged on the pipeline, and the switch control end of the eleventh control valve unit is connected with the control unit.
4. The apparatus for treating wastewater containing salt according to claim 2, wherein the liquid outlet of the first separator is connected to the liquid inlet pipeline of a filter, and the liquid outlet of the filter is connected to the inlet pipeline of the evaporative crystallizer.
5. The salt-containing wastewater treatment device according to claim 1, wherein the concentrated solution outlet of the evaporative crystallizer is connected with a liquid inlet pipeline of a thickener, the first outlet of the thickener is connected with the inlet of the second separator, the second outlet of the thickener is connected with the inlet of a freezing crystallizer, the outlet of the freezing crystallizer is connected with the inlet pipeline of the second separator, a twelfth control valve is arranged on the pipeline, and the switch control end of the twelfth control valve is connected with the control unit.
6. The apparatus of claim 5, wherein the liquid outlet of the second separator is connected to the inlet of the evaporative crystallizer.
7. The apparatus of claim 5, wherein the liquid outlet of the second separator is connected to the inlet of the oxidation reactor.
8. The salt-containing wastewater treatment device of claim 2, wherein the oxidation reactor and the precipitation reactor are both of cylindrical conical bottom structures, a mechanical stirring device is arranged in the oxidation reactor, and a cooling coil is arranged in the oxidation reactor.
9. The saline wastewater treatment device according to claim 1, wherein the evaporative crystallizer comprises a double-effect evaporator and a forced circulation evaporator, the liquid outlet of the first separator is respectively connected with the inlet of the double-effect evaporator and the inlet of the forced circulation evaporator, and the outlet of the double-effect evaporator is connected with the inlet of the forced circulation evaporator.
10. The apparatus of claim 5, wherein the freezing crystallizer is one of a jacketed crystallizer, an Oslo crystallizer, and a DTB crystallizer.
CN202120657854.2U 2021-03-31 2021-03-31 Contain salt effluent treatment plant Active CN215049427U (en)

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