CN210457803U - Miscellaneous salt piece-rate system of high salt waste water - Google Patents
Miscellaneous salt piece-rate system of high salt waste water Download PDFInfo
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- CN210457803U CN210457803U CN201921411036.3U CN201921411036U CN210457803U CN 210457803 U CN210457803 U CN 210457803U CN 201921411036 U CN201921411036 U CN 201921411036U CN 210457803 U CN210457803 U CN 210457803U
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Abstract
The utility model relates to a miscellaneous salt piece-rate system of high salt waste water, its structure including: the device comprises a raw water tank, a freezing crystallization device, a plate-and-frame filter press, a muffle furnace, a nanofiltration device, an MVR forced circulation evaporator, a centrifuge and a dryer, wherein a water outlet of the raw water tank is connected with a water inlet of the freezing crystallization device, a bottom crystallization material outlet of the freezing crystallization device is connected with a feed inlet of the plate-and-frame filter press, a mother liquid outlet of the freezing crystallization device is connected with a liquid inlet of the nanofiltration device, and a filtration liquid outlet of the nanofiltration device is connected withThe liquid outlet is connected with the feed inlet of the MVR forced circulation evaporator, and the material outlet of the MVR forced circulation evaporator is connected with the feed inlet of the centrifuge; and a concentrated solution outlet of the nanofiltration equipment, a filtrate outlet of the plate-and-frame filter press and a mother liquor outlet of the centrifuge are respectively communicated with the raw water tank through pipelines. The utility model discloses can be with NaCl and Na in the high salt waste water2SO4Effectively separated, the obtained high-purity industrial salt can be recycled, and simultaneously, the COD content in the high-salt wastewater can be effectively reduced, and the pollution of the wastewater to the environment is reduced.
Description
Technical Field
The utility model relates to a wastewater treatment system, in particular to a miscellaneous salt separation system for high-salinity wastewater.
Background
The industrial high-salinity wastewater refers to wastewater with the total salt content of more than 1 percent, and simultaneously contains organic matters, metal ions and the like. With the development of industry, the production amount of industrial wastewater is in an increasing trend, and particularly the production amount of high-salinity wastewater is increased day by day. In the production process of enterprises in the chemical and pharmaceutical industries, frequent adjustment of reaction systems is requiredpH value, hydrochloric acid, sulfuric acid and sodium hydroxide are frequently used, and the salt in the generated high-salinity wastewater is mostly NaCl and Na2SO4Mainly comprises the following steps. Therefore, the industrial high-salinity wastewater needs to be properly treated, and the adverse influence on the environment is avoided.
The existing high-salinity wastewater treatment process mainly comprises the following steps: biochemical methods, membrane concentration methods, evaporative crystallization, and the like. The utility model patent with publication number CN207361977U discloses an industry high salt waste water evaporation crystallization system, handles high salt waste water through the mode of evaporation concentration crystallization, and the derivative is solid and comdenstion water, comdenstion water retrieval and utilization to production line, but the solid is the complex salt, is difficult to realize the separation, consequently can't further use.
The above treatment processes cannot realize the separation of miscellaneous salts, and the obtained composite salt as solid waste cannot be recycled, so that not only can the waste of resources be caused, but also the secondary pollution is caused, and the organic matters in the high-salinity wastewater cannot be effectively treated. Therefore, development of a new high-salinity wastewater treatment process is required.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a miscellaneous salt piece-rate system of high salt waste water to solve the problem that current high salt waste water treatment process can't realize miscellaneous salt separation.
The purpose of the utility model is realized like this: a mixed salt separation system of high-salinity wastewater comprises:
the raw water tank is used for receiving and storing high-salinity wastewater to be treated;
the freezing and crystallizing device is used for receiving the high-salinity wastewater from the raw water tank and carrying out freezing and crystallizing;
the plate-and-frame filter press is used for receiving the crystallization material discharged from the bottom of the freezing and crystallizing device and filtering the crystallization material;
the muffle furnace is used for receiving the filter cake material from the plate-and-frame filter press and calcining the filter cake material;
the nanofiltration equipment is used for receiving the mother liquor from the freezing crystallization device and carrying out nanofiltration;
the MVR forced circulation evaporator is used for receiving filtrate from the nanofiltration equipment and carrying out concentration and crystallization;
the centrifuge is used for receiving the crystallized materials from the MVR forced circulation evaporator and carrying out centrifugal separation; and
a dryer to dry the material from the centrifuge;
and a concentrated solution outlet of the nanofiltration equipment, a filtrate outlet of the plate-and-frame filter press and a mother liquor outlet of the centrifuge are respectively communicated with the raw water tank through pipelines.
The water outlet of the raw water tank is connected with the water inlet of a freezing crystallization device through a pipeline, the bottom crystallization material outlet of the freezing crystallization device is connected with the feed inlet of the plate-and-frame filter press through a pipeline, the mother liquor outlet of the freezing crystallization device is connected with the liquid inlet of the nanofiltration equipment through a pipeline, the filtrate outlet of the nanofiltration equipment is connected with the feed inlet of the MVR forced circulation evaporator through a pipeline, and the material outlet of the MVR forced circulation evaporator is connected with the feed inlet of the centrifuge through a pipeline; and the pipelines for connecting all parts are respectively provided with a delivery pump.
The freezing crystallization device comprises a plurality of freezing crystallization tanks connected through pipelines, the mother liquor outlet of the former freezing crystallization tank is connected with the liquid inlet of the latter freezing crystallization tank through a pipeline, the crystal outlet at the bottom of each freezing crystallization tank is connected with the feed inlet of the plate-and-frame filter press through a pipeline, and the mother liquor outlet of the last freezing crystallization tank is connected with the liquid inlet of the nanofiltration equipment through a pipeline.
The utility model discloses a theory of operation does:
the high-concentration salt wastewater to be treated enters a freezing and crystallizing device from a raw water tank, the temperature in the freezing and crystallizing device is controlled to be within-3 to-5 ℃, and Na in the wastewater is subjected to freezing and crystallizing2SO4Gradually crystallizing and separating out, wherein part of COD in the wastewater is separated out along with the crystallization, the crystallized substances are filtered in a plate-and-frame filter press, the filtrate flows back to a raw water tank, the filter cake enters a muffle furnace to be calcined (600-700 ℃), and the COD is removed, so that the high-purity anhydrous sodium sulfate solid is obtained; and (3) allowing the mother liquor in the freezing crystallization device to enter a nanofiltration device for multi-stage nanofiltration treatment, returning the filtrate to a raw water tank, allowing the filtrate to enter an MVR forced circulation evaporator for evaporation, concentration and crystallization, and performing centrifugal separation and drying on the crystallized material to obtain a high-purity sodium chloride solid.
The utility model discloses can be with NaCl and Na in the high salt waste water2SO4Effectively separated to obtain high-purity sodium chloride industrial salt and sodium sulfate industrial salt, creates considerable economic benefit for enterprises, and simultaneously can effectively reduce COD content in high-salinity wastewater and reduce wastewaterAnd (5) pollution to the environment. The utility model discloses simple structure, high efficiency, easily industrialization is applied.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the device comprises a raw water tank, 2, a freezing crystallization tank, 3, a plate-and-frame filter press, 4, a muffle furnace, 5, a mother liquor storage tank, 6, nanofiltration equipment, 7, an MVR forced circulation evaporator, 8, a centrifugal machine, 9 and a dryer.
Detailed Description
As shown in figure 1, the utility model discloses a former water pitcher 1, freezing crystallization device, plate and frame filter press 3, muffle furnace 4, nanofiltration equipment 6, MVR forced circulation evaporimeter 7, centrifuge 8, desicator, sodium sulfate storage tank and sodium chloride storage tank.
The raw water tank 1 is used for receiving and temporarily storing high-concentration salt wastewater to be treated, and a water outlet of the raw water tank is connected with a water inlet of the freezing and crystallizing device through a pipeline.
The freezing crystallization device comprises a plurality of freezing crystallization tanks 2 which are connected, and the mother liquor outlet of the former freezing crystallization tank 2 is connected with the liquid inlet of the latter freezing crystallization tank 2 through a pipeline. The liquid inlet of the first freezing crystallization tank 2 is connected with the water outlet of the raw water tank 1, the mother liquor outlet of the last freezing crystallization tank 2 is connected with the nanofiltration equipment 6, and the crystal outlet at the bottom of each freezing crystallization tank 2 is respectively connected with the material inlet of the plate-and-frame filter press 3 through a pipeline. The freezing and crystallizing device is used for freezing and crystallizing the high-concentration salt wastewater, the temperature in each freezing and crystallizing tank 2 is regulated to be minus 3 to minus 5 ℃, and Na in the wastewater2SO4Will gradually crystallize and separate out, part of COD in the waste water will also separate out along with the crystallization, and then Na is realized2SO4And separation of a portion of the COD from the wastewater.
Because the total salt content in the high-salt wastewater to be treated is usually 3-6 wt%, the crystallization amount obtained in the freezing crystallization step is less relative to the total amount of the wastewater, only the crystal precipitated at the bottom of the freezing crystallization tank 2 needs to be directly discharged into the plate-and-frame filter press 3, and the mother liquor at the upper part of the crystal is directly pumped to the nanofiltration equipment 6 through the conveying pump, so that the energy consumed by filtering all materials in the freezing crystallization device is reduced, and the treatment efficiency of the system is also improved.
The plate-and-frame filter press 3 is used for receiving the crystal from the freezing and crystallizing device and filtering the crystal, the obtained filtrate returns to the raw water tank 1 through a pipeline, and the filter cake enters the muffle furnace 4.
The muffle 4 is used to receive the filter cake from the plate and frame filter press 3 and calcine it. Controlling the calcining temperature in the muffle furnace 4 to be 600-700 ℃, calcining and removing COD in the filter cake to obtain high-purity anhydrous sodium sulfate, and storing the high-purity anhydrous sodium sulfate in a sodium sulfate storage tank.
The nanofiltration equipment 6 is used for receiving the mother liquor from the freezing and crystallizing device, and the water inlet of the nanofiltration equipment is connected with the mother liquor outlet of the last freezing and crystallizing tank 2 through a pipeline. After the mother liquor enters the nanofiltration equipment 6, univalent ions (mainly Na) in the liquor+And Cl-) The filtrate is high-concentration sodium chloride solution, and the trapped liquid flows back to the raw water tank 1 through the return pipe. A mother liquor storage tank 5 can be additionally arranged between the freezing crystallization device and the nanofiltration equipment 6 according to actual conditions for temporarily storing a large amount of mother liquor generated by the freezing crystallization device.
The material inlet of the MVR forced circulation evaporator 7 is connected with the filtrate outlet of the nanofiltration device 6 through a pipeline, and is used for receiving the filtrate (sodium chloride) from the nanofiltration device 6, and evaporating, concentrating and crystallizing the filtrate.
A material inlet of the centrifuge 8 is connected with a material outlet of the MVR forced circulation evaporator 7, all materials obtained after crystallization of the MVR forced circulation evaporator 7 enter the centrifuge 8 for solid-liquid separation, the centrifugal mother liquid returns to the raw water tank 1 through a pipeline, and the separated solids enter the dryer 9 for drying to obtain high-purity sodium chloride solids which are stored in a sodium chloride storage tank.
And the connecting pipelines between the parts are respectively provided with a delivery pump.
Claims (2)
1. A miscellaneous salt separation system of high salt waste water, characterized by including:
the raw water tank is used for receiving and storing high-salinity wastewater to be treated;
the freezing and crystallizing device is used for receiving the high-salinity wastewater from the raw water tank and carrying out freezing and crystallizing;
the plate-and-frame filter press is used for receiving the crystallization material discharged from the bottom of the freezing and crystallizing device and filtering the crystallization material;
the muffle furnace is used for receiving the filter cake material from the plate-and-frame filter press and calcining the filter cake material;
the nanofiltration equipment is used for receiving the mother liquor from the freezing crystallization device and carrying out nanofiltration;
the MVR forced circulation evaporator is used for receiving filtrate from the nanofiltration equipment and carrying out concentration and crystallization;
the centrifuge is used for receiving the crystallized materials from the MVR forced circulation evaporator and carrying out centrifugal separation; and
a dryer to dry the material from the centrifuge;
and a concentrated solution outlet of the nanofiltration equipment, a filtrate outlet of the plate-and-frame filter press and a mother liquor outlet of the centrifuge are respectively communicated with the raw water tank through pipelines.
2. The system for separating mixed salt in high-salinity wastewater according to claim 1, wherein the freezing crystallization device comprises a plurality of freezing crystallization tanks connected through pipelines, the mother liquor outlet of the former freezing crystallization tank is connected with the liquid inlet of the latter freezing crystallization tank through a pipeline, the crystal outlet at the bottom of each freezing crystallization tank is respectively connected with the feed inlet of the plate-and-frame filter press through a pipeline, and the mother liquor outlet of the last freezing crystallization tank is connected with the liquid inlet of the nanofiltration device through a pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921411036.3U CN210457803U (en) | 2019-08-28 | 2019-08-28 | Miscellaneous salt piece-rate system of high salt waste water |
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| CN201921411036.3U CN210457803U (en) | 2019-08-28 | 2019-08-28 | Miscellaneous salt piece-rate system of high salt waste water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112408568A (en) * | 2020-11-30 | 2021-02-26 | 江苏清泉化学股份有限公司 | Method for treating high-salinity wastewater containing sodium chloride |
| CN112408569A (en) * | 2020-11-30 | 2021-02-26 | 江苏清泉化学股份有限公司 | Continuous treatment method of high-salinity wastewater containing sodium chloride |
| CN113562918A (en) * | 2021-08-09 | 2021-10-29 | 天俱时工程科技集团有限公司 | Method for treating high-concentration organic wastewater containing manganese |
-
2019
- 2019-08-28 CN CN201921411036.3U patent/CN210457803U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112408568A (en) * | 2020-11-30 | 2021-02-26 | 江苏清泉化学股份有限公司 | Method for treating high-salinity wastewater containing sodium chloride |
| CN112408569A (en) * | 2020-11-30 | 2021-02-26 | 江苏清泉化学股份有限公司 | Continuous treatment method of high-salinity wastewater containing sodium chloride |
| CN113562918A (en) * | 2021-08-09 | 2021-10-29 | 天俱时工程科技集团有限公司 | Method for treating high-concentration organic wastewater containing manganese |
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Address after: 050000 26 / F, block a, No.319 Xiangjiang Road, hi tech Zone, Shijiazhuang City, Hebei Province Patentee after: TIANJUSHI ENGINEERING TECHNOLOGY GROUP Co.,Ltd. Address before: 050000, No. 18, No. 9, Changjiang Road, Hebei, Shijiazhuang, China Hi Tech International Information Center Patentee before: TIANJUSHI ENGINEERING TECHNOLOGY GROUP Co.,Ltd. |