CN113149104A - High-salinity wastewater normal-temperature evaporation zero-emission treatment system and treatment method - Google Patents
High-salinity wastewater normal-temperature evaporation zero-emission treatment system and treatment method Download PDFInfo
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- CN113149104A CN113149104A CN202110157809.5A CN202110157809A CN113149104A CN 113149104 A CN113149104 A CN 113149104A CN 202110157809 A CN202110157809 A CN 202110157809A CN 113149104 A CN113149104 A CN 113149104A
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- C02F1/00—Treatment of water, waste water, or sewage
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Abstract
The invention relates to a wastewater discharge treatment system and a treatment method, in particular to a high-salinity wastewater normal-temperature evaporation zero-discharge treatment system and a treatment method, and belongs to the technical field of water treatment. The system comprises a raw water tank, wherein the raw water tank is connected with a solid-liquid separation tank through a raw water lifting pump, liquid in the solid-liquid separation tank is connected with a normal temperature evaporator through a circulating water pump, an induced draft fan used for sucking ambient air is arranged in the normal temperature evaporator, and solid in the solid-liquid separation tank is discharged out of the system through a centrifugal dehydrator. The invention realizes the continuous evaporative crystallization treatment of high-salinity wastewater under the conditions of normal temperature and normal pressure by introducing dry ambient air and utilizing hot air as a carrier to perform high-efficiency heat transfer and mass transfer processes with the wastewater in the normal-temperature evaporation unit. And discharging the crystal out of the device after the crystal is dehydrated by the centrifugal dehydration unit. The process has the advantages of capability of realizing the reutilization of waste heat resources, stable and reliable equipment operation, low system operation cost, high automation degree, simple operation and maintenance and the like.
Description
Technical Field
The invention relates to a wastewater discharge treatment system and a treatment method, in particular to a high-salinity wastewater normal-temperature evaporation zero-discharge treatment system and a treatment method, and belongs to the technical field of water treatment.
Background
In recent years, with the development of industrial and agricultural production and the improvement of the living standard of people in cities and towns, industrial wastewater and urban sewageThe environmental pollution caused by the increasing water discharge amount has seriously affected the environmental ecology and human health, especially the discharge of high-salinity wastewater. The high-salinity wastewater refers to wastewater at least containing 3.5 percent of total Dissolved solids TDS (total Dissolved solid), which is mainly derived from high-salinity wastewater generated in industrial production process, and contains a large amount of inorganic salts such as Cl and SO4 2-、Na+、Ca2+ plasma, the presence of these salts has a significant inhibitory effect on conventional biological treatment. Aiming at the wastewater, the existing mature and effective process treatment methods comprise a multi-effect evaporation technology and an MVR evaporation technology. For example, patent No. 201310238539.6 entitled "a process for treating high-salinity wastewater by multiple effect evaporation" discloses the treatment of high-salinity wastewater by chemical sedimentation to remove calcium and magnesium ions, then oxidizing organic substances by microbial oxidation, and then separating the brine by heating evaporation. The existing evaporation treatment technology needs to make the wastewater in a boiling state, so that on one hand, a large amount of high-quality electric energy or heat source needs to be consumed, on the other hand, the equipment corrosion risk is increased under a high-temperature condition, and meanwhile, the scaling problem is more serious in an acute evaporation process. The treatment system disclosed in application No. 201510741983.9, entitled MVR (mechanical vapor recompression) evaporative crystallization treatment system for high-concentration salt-containing wastewater comprises a raw material storage tank, a feed pump, a plate heat exchanger, a DTB evaporative crystallizer heating chamber, a DTB evaporative crystallizer, a vacuum evaporative crystallizer heating chamber, a vacuum evaporative crystallizer, a first hydrocyclone, a sodium sulfate slurry barrel, a two-stage pushing centrifuge, a vibrating fluidized bed dryer, a first mother liquor storage tank, a first mother liquor pump and a mother liquor circulating pump, wherein the raw material storage tank is sequentially connected with the feed pump, the plate heat exchanger, the DTB evaporative heating chamber, the DTB evaporative crystallizer and the vacuum evaporative crystallizer heating chamber. The system structure is very complicated. The waste water obtained by the two treatment modes contains COD, is easy to scale and block, has high cleaning difficulty, and must be cleaned after being used and shut down to ensure the next use. In order to ensure the continuous and stable operation of the equipment, more expensive materials are required to be selected, and the wastewater is subjected to stricter softening pretreatment, so that the zero-emission investment cost and the operation cost are high.
Disclosure of Invention
The invention aims to provide a normal-temperature evaporation zero-emission treatment system and a treatment method for high-salinity wastewater, aiming at the defects of high wastewater treatment cost and easiness in equipment scaling in the prior art, and realizing zero-emission treatment.
The invention solves the technical problem by the following technical scheme: the utility model provides a high salt waste water normal atmospheric temperature evaporation zero release processing system, is including the former water tank that holds high salt waste water, the former water tank connects the solid-liquid separation case through raw water elevator pump, the normal atmospheric temperature evaporimeter is connected through circulating water pump to the liquid in the solid-liquid separation case, settle the draught fan that is used for pumping ambient air in the normal atmospheric temperature evaporimeter, the solid in the solid-liquid separation case is through centrifugal dehydrator discharge system, the liquid end connection solid-liquid separation case of centrifugal dehydrator, each device is through the pipe connection in the system. The equipment has mild operation condition and small temperature rise, uses the climate drying in northern areas, adopts the ambient air as a steaming heat source, and is economic and efficient. Waste water and air in the system are directly contacted and evaporated, and the scaling risk of the system is reduced.
Furthermore, the solid-liquid separation box consists of a left box body used for containing concentrated solution and high-salinity wastewater and a right box body capable of containing overflowing liquid of the left box body. The liquid outlet end of the raw water tank and the liquid outlet end of the centrifugal dehydrator are respectively connected with the right box body.
For realizing the quick heat exchange of ambient air and high salt waste water, be equipped with the atomizing nozzle who is connected with circulating water pump in the normal atmospheric temperature evaporimeter, atomizing nozzle below be equipped with the nozzle injection direction vertically a plurality of small unit, the evaporimeter is inside to constitute by the small unit of countless, and the air is by transversely getting into narrow and small runner, sprays into a comparatively broad space, forms local negative pressure around the runner, and waste water forms the water film at the lateral wall through water distribution device, because of the existence of local negative pressure for liquid level steam partial pressure and gaseous phase steam partial pressure differential pressure increase, and a large amount of hydrones are by liquid phase diffusion to gaseous phase, and the concentrated solution is outside the evaporimeter of discharging after collecting from the evaporimeter bottom. The evaporator improves the efficiency of water vapor heat and mass transfer to the maximum extent by optimizing the flow state distribution of the waste water and the air, and ensures the continuous and stable operation of the evaporator.
One side of the draught fan is provided with a water collector for intercepting atomized water.
The invention further solves the technical problems by a treatment method of a normal-temperature evaporation zero-emission treatment system for high-salinity wastewater: the method comprises the following steps that high-salinity wastewater in a raw water tank is lifted by a raw water lifting pump to enter a right box body of a solid-liquid separation tank, the high-salinity wastewater is pumped into an atomizing nozzle through a circulating water pump, the atomized high-salinity wastewater enters a normal-temperature evaporator, meanwhile, ambient air enters the normal-temperature evaporator under the suction action of a draught fan, the high-salinity wastewater and the ambient air mutually transfer heat and mass in the normal-temperature evaporator, water molecules in the wastewater rapidly diffuse to air and reach a saturated state to form a saturated humid air discharge system, evaporated concentrate automatically flows to the left box body of the solid-liquid separation tank, the concentrate and the high-salinity wastewater overflow to the right box body of the solid-liquid separation tank from the left box body of the solid-liquid separation tank together, crystals generated by evaporation concentration and evaporation are discharged out of the system after being centrifuged by a centrifugal dehydrator at regular intervals, and dehydrated supernatant flows back to the right box body of the solid-liquid separation tank.
The heat and mass transfer process of the method is that environmental air transversely enters an evaporator, high-salinity wastewater forms a water film on the side wall through a water distribution device, the partial pressure difference between the liquid surface steam partial pressure and the gas phase steam partial pressure is increased by local negative pressure, a large amount of water molecules are diffused to the gas phase from the liquid phase, the water molecules in the wastewater are rapidly diffused to the air and reach a saturated state, and a saturated wet air discharge system is formed; and the saturated wet air is discharged from the side surface of the normal-temperature evaporator.
The humidity of the normal-temperature evaporator is less than 60%, and the flow speed of ambient air in the normal-temperature evaporator is less than or equal to 2.0 m/s.
The invention has the following advantages: the operation cost is low, the equipment directly adopts ambient air as an evaporation carrier, and after water vapor exchange, the air is discharged after reaching saturation, so that the operation energy consumption is reduced while the normal-temperature evaporation zero-discharge treatment of the high-salinity wastewater is realized. The equipment runs stably and reliably, the ambient air and water are directly contacted and evaporated, and the corrosion and scaling risk of the system is lower; because the equipment operates at normal temperature and normal pressure, the operation safety performance is greatly improved. The investment cost of the equipment is low, all the equipment (atomizing nozzle, water pump, fan, evaporator and the like) in the invention are conventional equipment, the normal temperature and the normal pressure are realized, and the purchase and manufacturing cost of the equipment is low. The automation degree is high, the operation and maintenance are simple, and the machine does not need to be stopped for cleaning.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
Example 1
The structure of this embodiment is as shown in fig. 1, a high salt waste water normal atmospheric temperature evaporation zero release processing system, including holding the former water tank 1 of high salt waste water, former water tank 1 connects solid-liquid separation case 3 through former water elevator pump 2, the liquid in the solid-liquid separation case 3 connects normal atmospheric temperature evaporimeter 6 through circulating water pump 4, settle the draught fan 8 that is used for pumping ambient air in the normal atmospheric temperature evaporimeter 6, the solid in the solid-liquid separation case 3 is through the discharge system of centrifugal dehydrator 9, solid-liquid separation case 3 comprises the left side box that is used for connecing concentrate and high salt waste water greatly and the right side box that can connect left side box spill greatly. The liquid outlet end of the raw water tank 1 and the liquid outlet end of the centrifugal dehydrator 9 are connected with the right box body of the solid-liquid separation box 3, and all devices in the system are connected through pipelines. One side of the draught fan 8 is provided with a water collector 7 for intercepting atomized water.
In order to realize the rapid heat exchange between the ambient air and the high-salinity wastewater, an atomizing nozzle 5 connected with a circulating water pump 4 is arranged in a normal-temperature evaporator 6, a plurality of micro units vertical to the spraying direction of the nozzle are arranged below the atomizing nozzle 5, the normal-temperature evaporation system is developed by utilizing the principle that saturated air contains a large amount of water vapor, the water content in the air is greatly increased along with the rise of the temperature, and a plurality of water molecules can be evaporated even in a low-temperature state, the evaporator is internally composed of a plurality of micro units, the air transversely enters a narrow flow passage and is sprayed into a wider space, local negative pressure is formed around the flow channel, wastewater forms a water film on the side wall through the water distribution device, and due to the existence of the local negative pressure, the pressure difference between the liquid level steam partial pressure and the gas phase steam partial pressure is increased, a large amount of water molecules are diffused to the gas phase from the liquid phase, and the concentrated solution is collected from the bottom of the evaporator and then discharged out of the evaporator. The evaporator improves the efficiency of water vapor heat and mass transfer to the maximum extent by optimizing the flow state distribution of the waste water and the air, and ensures the continuous and stable operation of the evaporator.
When the device is used, high-salinity wastewater in the raw water tank is lifted by the raw water lifting pump 3 and then enters the right box body of the solid-liquid separation tank 3, the high-salinity wastewater is pumped into the atomizing nozzle 5 through the circulating water pump 4 to be atomized and then enters the normal-temperature evaporator 6, the evaporated concentrated solution automatically flows to the left box body of the solid-liquid separation tank 3, the concentrated solution and the high-salinity wastewater overflow to the right box body of the solid-liquid separation tank 3 from the left box body of the solid-liquid separation tank 3 together, ambient air enters the normal-temperature evaporator 6 under the suction action of the draught fan 8, and water molecules in the wastewater are rapidly diffused to the air and reach a saturated state in the heat and mass transfer process of the high-salinity wastewater and the ambient air in the normal-temperature evaporator 6, so that zero-emission evaporation treatment of the desulfurization wastewater is realized. The crystals generated by evaporation concentration and evaporation are discharged out of the device after being centrifuged by the centrifugal dehydrator 9 at regular intervals, and the dehydrated supernatant flows back to the right box body of the solid-liquid separation box 3. In the heat and mass transfer process in the normal-temperature evaporator, ambient air transversely enters the evaporator, high-salinity wastewater forms a water film on the side wall through a water distribution device, the partial pressure difference between liquid surface steam partial pressure and gas phase steam partial pressure is increased due to local negative pressure, a large amount of water molecules are diffused to the gas phase from the liquid phase, so that the water molecules in the wastewater are rapidly diffused to the air and reach a saturated state, and a saturated wet air discharge system is formed; the saturated wet air is discharged from the side of the normal temperature evaporator.
As shown in table 1, compared with the prior art, the system of the embodiment can reduce the operation energy consumption while realizing the normal-temperature evaporation zero-emission treatment of the high-salinity wastewater. The equipment has stable and reliable operation, low manufacturing cost, obviously low operation and maintenance cost, high automation degree, simple operation and maintenance and no need of shutdown and cleaning.
TABLE 1
In addition to the above, other embodiments of the present invention are possible. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a high salt waste water normal atmospheric temperature evaporation zero release processing system, is including holding the former water tank of high salt waste water, its characterized in that: raw water tank connects the solid-liquid separation case through raw water elevator pump, normal atmospheric temperature evaporimeter is connected through circulating water pump to the liquid in the solid-liquid separation case, the upper end of normal atmospheric temperature evaporimeter is equipped with the water distribution device of being connected with circulating water pump, and inside settles the draught fan that is used for sucking ambient air, the water collector that is used for holding back the atomized water is settled in the left side of draught fan, the solid in the solid-liquid separation case is through centrifugal dehydrator discharge system, the solid-liquid separation case is connected to centrifugal dehydrator's play liquid end, each device is through the pipe connection in the system.
2. The normal-temperature evaporation zero-emission treatment system for high-salinity wastewater according to claim 1, characterized in that: the solid-liquid separation box consists of a left box body used for containing concentrated solution and high-salinity wastewater and a right box body capable of containing overflowing liquid of the left box body.
3. The normal-temperature evaporation zero-emission treatment system for high-salinity wastewater according to claim 2, characterized in that: the liquid outlet end of the raw water tank and the liquid outlet end of the centrifugal dehydrator are respectively connected with the right box body.
4. The normal-temperature evaporation zero-emission treatment system for high-salinity wastewater according to claim 2, characterized in that: the right box body is also used for containing atomized water intercepted by a water receiver positioned above the right box body.
5. The normal-temperature evaporation zero-emission treatment system for high-salinity wastewater according to claim 1, characterized in that: the water distribution device comprises an atomizing nozzle, and a plurality of micro units vertical to the spraying direction of the nozzle are arranged below the atomizing nozzle.
6. The treatment method of the normal-temperature evaporation zero-emission treatment system for the high-salinity wastewater according to claim 1, comprising the following steps of: high salt waste water in the raw water tank is promoted by the raw water elevator pump and gets into solid-liquid separation case right side box, squeeze into the atomizing nozzle of water distribution device through circulating water pump, get into the normal atmospheric temperature evaporimeter after the atomizing, meanwhile, ambient air gets into the normal atmospheric temperature evaporimeter under the suction effect of draught fan, high salt waste water and ambient air heat transfer matter each other in the normal atmospheric temperature evaporimeter, make the water molecule in the waste water rapidly to air diffusion and reach saturated condition, form saturated humid air discharge system, the concentrate gravity flow to the left side box of solid-liquid separation case after the evaporation, concentrate and high salt waste water overflow to the right side box of solid-liquid separation case by solid-liquid separation case left side box together, the crystalline solid that evaporation concentration evaporation produced regularly discharges the system after the centrifugation of centrifugal dehydrator, supernatant after the dehydration flows back to solid-liquid separation case right side box.
7. The treatment method of the normal-temperature evaporation zero-emission treatment system for the high-salinity wastewater according to claim 6, characterized by comprising the following steps: in the heat and mass transfer process, ambient air transversely enters an air passage of the first assembly, is sprayed into an interval between the first assembly and the second assembly, local negative pressure is formed around the interval, high-salinity wastewater forms a water film on the side wall through a water distribution device, the pressure difference between the liquid surface steam partial pressure and the gas phase steam partial pressure is increased due to the local negative pressure, a large amount of water molecules are diffused to the gas phase from the liquid phase, and the water molecules in the wastewater are rapidly diffused to the air and reach a saturated state, so that a saturated wet air discharge system is formed; and the saturated wet air is discharged from the side surface of the normal-temperature evaporator.
8. The treatment method of the normal-temperature evaporation zero-emission treatment system for the high-salinity wastewater according to claim 6, characterized by comprising the following steps: the humidity of the normal-temperature evaporator is less than 60%, and the flow speed of ambient air in the normal-temperature evaporator is less than or equal to 2.0 m/s.
9. The treatment method of the normal-temperature evaporation zero-emission treatment system for the high-salinity wastewater according to claim 6, characterized by comprising the following steps: the atomizing nozzle has atomizing angle of 60-120 deg, atomizing grain diameter of 10-50um., stainless steel nozzle core and stainless steel guide vane inside the nozzle, and one drip-proof device inside the nozzle, so that liquid flows at high speed under water pressure of 20-120 kg to form one centrifugal vortex inside the guide vane to spray fine fog grains from the nozzle hole.
10. The treatment method of the normal-temperature evaporation zero-emission treatment system for the high-salinity wastewater according to claim 6, characterized by comprising the following steps: the air volume of the cross-sectional area of each draught fan per square is 10800m/h, the static pressure is 100Pa, and the humidity is 100%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114014480A (en) * | 2021-11-09 | 2022-02-08 | 洛阳昊冶分离环保科技有限公司 | Hydrochloric acid pickling waste water concentration crystallization separation zero release equipment |
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| CN106902532A (en) * | 2017-03-27 | 2017-06-30 | 上海泓毅环保科技有限公司 | A kind of low temp liquid evaporator |
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| CN110668625A (en) * | 2019-11-22 | 2020-01-10 | 北京朗新明环保科技有限公司南京分公司 | High-efficiency energy-saving desulfurization wastewater treatment process system |
| CN211226744U (en) * | 2019-07-24 | 2020-08-11 | 连云港友尚化工工程设计有限公司 | High salt, high COD waste water low temperature evaporation enrichment facility |
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- 2021-02-04 CN CN202110157809.5A patent/CN113149104A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106902532A (en) * | 2017-03-27 | 2017-06-30 | 上海泓毅环保科技有限公司 | A kind of low temp liquid evaporator |
| CN108117215A (en) * | 2017-12-25 | 2018-06-05 | 重庆大学 | High-salt wastewater cycles tubulation atmospheric evaporation decrement treatment method and apparatus |
| CN211226744U (en) * | 2019-07-24 | 2020-08-11 | 连云港友尚化工工程设计有限公司 | High salt, high COD waste water low temperature evaporation enrichment facility |
| CN110668625A (en) * | 2019-11-22 | 2020-01-10 | 北京朗新明环保科技有限公司南京分公司 | High-efficiency energy-saving desulfurization wastewater treatment process system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114014480A (en) * | 2021-11-09 | 2022-02-08 | 洛阳昊冶分离环保科技有限公司 | Hydrochloric acid pickling waste water concentration crystallization separation zero release equipment |
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