CN111544910A - Liquid evaporation, concentration and drying integrated treatment method - Google Patents
Liquid evaporation, concentration and drying integrated treatment method Download PDFInfo
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- CN111544910A CN111544910A CN202010423410.2A CN202010423410A CN111544910A CN 111544910 A CN111544910 A CN 111544910A CN 202010423410 A CN202010423410 A CN 202010423410A CN 111544910 A CN111544910 A CN 111544910A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D1/30—Accessories for evaporators ; Constructional details thereof
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Abstract
The invention relates to the technical field of liquid treatment, in particular to an integrated treatment method for evaporation, concentration and drying of liquid. The processing method comprises the following steps: pumping the stock solution into an evaporator, feeding high-temperature steam into a heat exchanger in the evaporator to heat the stock solution, and evaporating and concentrating the stock solution; evaporating and concentrating the stock solution in an evaporator tank to form a concentrated solution, and flowing into a hot well at the bottom of the evaporator; mixing the concentrated solution in the hot well with the incoming liquid, pumping the mixture back to the evaporator, evaporating and concentrating again, and continuously performing circulating evaporation; pumping the concentrated solution into a drier at a certain concentration, evaporating and drying the concentrated solution by the drier until the concentrated solution is completely dehydrated to form a cured substance, and discharging the cured substance out of the equipment. The treatment method adopts the drier to replace equipment such as a centrifugal machine, solves the problems of high equipment failure rate, frequent cleaning and equipment abnormality caused by high boiling point after concentrated solution mother liquor flows back to the evaporator, is suitable for liquid full-scale treatment of high-salinity high-organic matters, and has the characteristic of being suitable for large-scale application.
Description
Technical Field
The invention relates to the technical field of liquid treatment, in particular to an integrated treatment method for evaporation, concentration and drying of liquid.
Background
The mechanical vapor recompression treatment technology is gradually applied to domestic liquid treatment engineering, a vapor compressor is generally adopted to recompress and heat secondary vapor generated by an evaporator, so that the secondary vapor becomes a regenerative heat source to circularly carry out heat transfer and evaporation on stock solution in the evaporator, the water content of the stock solution is reduced, the stock solution enters equipment such as a thickener and the like for sedimentation and dehydration after being concentrated, and then enters a centrifuge for solid-liquid separation, so that solid materials are separated from the stock solution.
In particular, in the process of sewage treatment, because the sewage is complex in type, after a sewage stock solution is subjected to sedimentation and dehydration by equipment such as an evaporator and a thickener, the content of organic matters and salt in the stock solution is high, the stock solution becomes viscous, the fluidity of the viscous high-concentration concentrate is poor, the influence on the work of a centrifugal machine and the like is large, a filter screen of the centrifugal machine is often blocked, or the inside of the centrifugal machine is hardened and scaled, the separation work of the centrifugal machine is influenced, and the centrifugal machine must be frequently stopped and manually cleaned. In addition, after the concentrated solution is subjected to solid-liquid separation by a centrifuge, the mother solution needs to flow back to the evaporator for re-evaporation and concentration, but the evaporation efficiency of the equipment is reduced due to the fact that the mother solution contains residual high-boiling-point liquid, and the high-boiling-point liquid is continuously accumulated due to continuous backflow, so that the equipment cannot normally operate, and the water content of the solid is very high.
Disclosure of Invention
In order to solve the defects of the prior art, the invention discloses an integrated treatment method for evaporating, concentrating and drying liquid.
The technical scheme adopted by the invention for solving the technical problems is as follows: a liquid evaporation, concentration and drying integrated treatment method comprises the following steps:
the method comprises the following steps: pumping the stock solution into an evaporator through a feed pump, feeding high-temperature steam into a heat exchanger in the evaporator, heating the stock solution by the evaporator, and evaporating and concentrating;
step two: evaporating and concentrating the stock solution in an evaporator to form a concentrated solution, performing heat exchange and evaporation concentration through a heat exchanger in the evaporator, and enabling the concentrated solution to flow into a hot well at the bottom of the evaporator;
step three: mixing the concentrated solution in the hot well with the stock solution, pumping the mixture back to the evaporator through a circulating pump, evaporating and concentrating again, and continuously circularly evaporating;
step four: and pumping the concentrated solution to a drier by a concentrated solution pump after the concentrated solution reaches a target concentration, feeding high-temperature steam into a heat exchanger in the drier, and evaporating and drying the concentrated solution by the drier until the concentrated solution is completely dehydrated to form a cured substance and the cured substance is discharged out of the equipment.
Further, in the first step, after the stock solution is pumped into the evaporator, the stock solution is sprayed on the heat exchange plate pipe through the spraying pipeline, the high-temperature steam flows into the heat exchange channel in the heat exchange plate pipe, and the stock solution contacts with the pipe wall of the heat exchange plate pipe to exchange heat with the high-temperature steam in the plate pipe, so that the liquid is heated and evaporated and concentrated.
Further, in the first step and the fourth step, when the evaporator evaporates the stock solution and the drier dries the concentrated solution, distilled water is generated, the distilled water is pumped into the heat exchanger through the distilled water pump, the distilled water exchanges heat with the stock solution in the heat exchanger, and the stock solution is pumped into the evaporator through the feeding pump after being heated.
Further, in the first step and the fourth step, secondary steam is generated when the evaporator evaporates the stock solution and the drier dries the concentrated solution, flows into the steam compressor to be compressed and heated, and is pumped back to the evaporator and the drier.
Further, in the first step, the evaporator uses high-temperature steam or external fresh steam generated by the steam generating tank as a preheating heat source to exchange heat with the stock solution, so that the stock solution is heated and evaporated and concentrated.
Further, in the fourth step, after the concentrated solution is circularly evaporated and concentrated, the concentration reaches the target concentration, the concentrated solution valve is opened, and the concentrated solution is pumped into the drier through the concentrated solution pump.
Further, in the fourth step, the high-temperature steam flows into a heat exchange plate pipe in the drier equipment, and the high-temperature steam exchanges heat with the concentrated solution outside the heat exchange plate pipe, so that the concentrated solution is evaporated and dried to form a cured substance.
Furthermore, after the steam generating tank or the external fresh steam works for a period of time, the steam generation is stopped, the steam compressor starts to work, and high-temperature steam is continuously provided for the evaporator and the drier.
Compared with the prior art, the invention has the beneficial effects that:
1: according to the integrated treatment method for liquid evaporation, concentration and drying, provided by the invention, the drier is adopted to replace equipment such as a centrifugal machine and the like, and the drier dries the concentrated solution to directly dry the concentrated solution to form a solidified substance to be discharged, so that the integrated treatment method for liquid evaporation, concentration and drying solves the problems that the equipment has high failure rate and needs to be cleaned frequently, and the equipment is abnormal due to high boiling point after the concentrated solution mother solution flows back to the evaporator, and the water content of the solid is low.
2: according to the integrated treatment method for liquid evaporation concentration and drying, the low-energy consumption device for evaporation drying of the concentrated solution is utilized by the method, the interior of the device is not easy to form plates, scale and block, and the integrated treatment method is suitable for treating liquids with high salinity and high organic matters and has the characteristic of being suitable for large-scale application.
3: according to the integrated treatment method for evaporation, concentration and drying of the liquid, provided by the invention, the original liquid is continuously and circularly evaporated in the evaporator by using the circulating pump to form the concentrated solution with higher concentration, so that the subsequent drying is more sufficient, and the drying efficiency is improved.
4: according to the integrated treatment method for evaporation, concentration and drying of the liquid, provided by the invention, as the secondary steam is used as the heat source of the evaporator and the dryer by using the steam compressor, the heat energy is recycled, and the requirement on external energy is reduced, so that the effects of energy conservation and environmental protection are achieved.
5: according to the integrated treatment method for evaporation, concentration and drying of the liquid, provided by the invention, the heat exchanger is used for carrying out heat exchange between the distilled water and the stock solution, the temperature of the stock solution is increased, and the stock solution enters the evaporator to reach an evaporation condition more quickly, so that the working energy consumption is reduced, and the energy is saved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying description and examples:
a liquid evaporation, concentration and drying integrated treatment method comprises the following steps:
the method comprises the following steps: pumping the stock solution into a pump 14 through a feed pump 34, feeding high-temperature steam into a heat exchanger in an evaporator 12, heating the stock solution by the evaporator 12, and evaporating and concentrating;
step two: the stock solution is evaporated and concentrated in the evaporator 12 to form a concentrated solution, the concentrated solution is evaporated and concentrated by a heat exchanger in the evaporator 12, and the concentrated solution flows into a hot well 14 at the bottom of the evaporator;
step three: the concentrated solution in the hot well 14 is mixed with the stock solution and pumped back to the evaporator through the circulating pump 42, evaporated and concentrated again, and continuously evaporated in a circulating way;
step four: the concentrated solution is pumped into a drier 43 by a concentrated solution pump 41, high-temperature steam is sent into a heat exchanger in the drier 43, and the drier 43 evaporates and dries the concentrated solution until the concentrated solution is completely dehydrated to form a cured substance and the cured substance is discharged out of the equipment.
More preferably, in the first step, after the raw liquid is pumped into the evaporator 12, the raw liquid is sprayed onto the heat exchange plate tubes through the spraying pipes, the high-temperature steam flows into the heat exchange pipes in the heat exchange plate tubes, and the raw liquid contacts the heat exchange plates to exchange heat with the high-temperature steam, so that the raw liquid is heated and evaporated and concentrated.
More preferably, in the first step and the fourth step, the evaporator 12 evaporates the raw liquid and the drier 43 dries the concentrated liquid to generate distilled water, the distilled water is pumped into the heat exchanger 33 through the distilled water pump 32, the distilled water exchanges heat with the raw liquid in the heat exchanger 33, and the raw liquid is pumped into the evaporator through the feeding pump 34 after being heated.
More preferably, in the first step and the fourth step, secondary steam is generated when the evaporator 12 evaporates the raw liquid and the drier 43 dries the concentrated liquid, and the secondary steam flows into the steam compressor 51 to be compressed and heated, and is pumped back to the evaporator 12 and the drier 43 again.
More preferably, in the first step, the evaporator 12 uses the high-temperature steam or the external fresh steam generated by the steam generating tank 11 as a preheating heat source to exchange heat with the stock solution, so as to heat the stock solution and evaporate and concentrate the same.
More preferably, in the fourth step, after the concentrated solution is circularly evaporated and concentrated, the concentration reaches the target concentration, the concentrated solution valve 63 is opened, and the concentrated solution is pumped into the dryer 43 through the concentrated solution pump 41.
More preferably, in the fourth step, the high-temperature steam flows into the heat exchange plate tube inside the dryer 43, and the high-temperature steam exchanges heat with the concentrated solution outside the heat exchange plate tube, so that the concentrated solution is evaporated and dried to form a cured product.
More preferably, after the steam generating tank 11 or the external fresh steam is operated for a period of time, the generation of steam or the supplement of trace steam is stopped, the steam compressor 51 is started to operate, and high-temperature steam is continuously provided for the heat exchange plate pipes of the evaporator 12 and the heat exchange plate pipes of the dryer 43.
The first embodiment is as follows:
the utility model provides a liquid evaporation concentration mummification processing apparatus, includes evaporimeter 12, circulating pump 42, distilled water jar 31, 12 steam inlet and outside steam conduit intercommunication of evaporimeter, 12 distilled water export of evaporimeter is linked together with distilled water jar 31 water inlet, the evaporimeter bottom is connected with hot-well 14, 14 circulating water outlets of hot-well are linked together through circulating pump 42 and 12 circulating line water inlets of evaporimeter, 14 stoste water inlets of hot-well and outside pipeline intercommunication.
This device still includes desicator 43, dense liquid pump 41, the dense liquid delivery port of hot-well 14 is linked together through dense liquid pump 41 and desicator 43 water inlet, desicator 43 delivery port is linked together with distilled water tank 31 second water inlet, desicator 44 discharge gate and external intercommunication.
The device further comprises a steam compressor 51, wherein an air inlet of the steam compressor 51 is communicated with a steam exhaust port of the evaporator 12 and a steam exhaust port of the drier 43, and an exhaust port of the steam compressor 51 is communicated with a steam inlet of a heat exchanger of the evaporator 12 and an air inlet of a heat exchanger of the drier 43.
And demisting nets are arranged in the secondary steam exhaust port of the evaporator 12 and the secondary steam exhaust port of the drier 43. The demister is used for separating liquid drops and impurities carried in secondary steam generated by the evaporator 12 and the drier 43 so as to ensure that the operation of the steam compressor 51 and the quality of distilled water are not influenced.
The device further comprises a heat exchanger 33 and a feed pump 34, wherein a stock solution water inlet of the heat exchanger 33 is communicated with an external pipeline through the feed pump 34, a stock solution water outlet of the heat exchanger 33 is communicated with a stock solution water inlet of the hot well 14, a distilled water inlet of the heat exchanger 33 is communicated with a water outlet of the distilled water tank 31, and a distilled water outlet of the heat exchanger 33 is communicated with the external pipeline.
A distilled water pump 32 is arranged on a pipeline between the distilled water inlet of the heat exchanger 33 and the distilled water outlet of the distilled water tank 31, and the distilled water pump 32 is used for pumping the high-temperature distilled water in the distilled water tank 31 to the heat exchanger 33.
Still be equipped with distilled water valve 62 on the pipeline between heat exchanger 33 distilled water inlet and the distilled water jar 31 delivery port, be equipped with stoste valve 61 on the pipeline between heat exchanger 33 stoste delivery port and the hot-well 14 stoste water inlet, be equipped with concentrate valve 63 on the pipeline between the hot-well 14 stoste delivery port and the mummification ware 43 water inlet.
The device also comprises a steam generating tank 11, wherein an exhaust port of the steam generating tank 11 is communicated with a steam inlet of the evaporator 12. The evaporator 12 can not only provide a preheating heat source through an external steam pipeline, but also provide a preheating heat source for the evaporator 12 through high-temperature steam generated by the steam generating tank 11 according to the use requirement.
The evaporator 12 is a horizontal tube scraper evaporator. The horizontal scraper evaporator is a novel evaporator with strong adaptability, and is suitable for high viscosity and stock solution which is easy to crystallize and scale. It mainly comprises a plurality of heat transfer board pipes, steam chest and scraper blade subassembly, is equipped with the heat transfer pipeline in the heat transfer board, heat transfer pipeline and equipment both ends steam chest intercommunication, and the scraper blade subassembly includes scraper and drive assembly, and under drive assembly's drive, the scraper is the back and forth movement along the heat transfer board surface, and scrapes the stoste simultaneously, makes the stoste last in evaporation process and is scraped, avoids stoste crystallization, scale deposit to cause the jam. The stock solution is continuously evaporated and concentrated, flows into the hot well 14 through a bottom pipeline, secondary steam is formed by evaporation of water in the stock solution and escapes from the top, and non-condensable gas generated by evaporation of the stock solution is discharged from the tail side of the equipment and is discharged to the outside after being treated by non-condensable gas of external equipment.
The drier 43 achieves the effect of drying the concentrated solution through a heat exchanger in the device. Specifically, high-temperature steam generated by the steam compressor 51 flows into a heat exchange plate in the heat exchanger, concentrated solution flows on the heat exchange plate and exchanges heat with the high-temperature steam in the plate pipe, moisture in the concentrated solution is rapidly evaporated, dehydration is performed in a short time to form a condensate, and the condensate is discharged through the bottom of the equipment.
The device comprises the following working steps: the evaporator 12 steam inlet is in communication with an external steam line or steam generating tank 11. When the evaporator works, high-temperature steam outside or generated by the steam generating tank 11 flows into the evaporator 12 through the steam pipeline to preheat liquid. The steam box is communicated with the heat exchange pipelines in the heat exchange plates, so that the heat exchange plates are filled with high-temperature steam. After the plant is started, the raw liquid containing impurities, salts and organic substances flows through the external pipe, flows into the heat exchanger 33 by the feed pump 34 and then flows into the hot well 14. The stock solution flows into the spray pipe at the top in the evaporator 12 from the circulating water inlet of the evaporator 12 under the action of the circulating pump 42. The stock solution sprays on the heat transfer board pipe through the shower pipeline, because fill with high-temperature steam in the heat transfer board, heat transfer board pipe surface temperature is high, and stock solution relative temperature is low, and the heat transfer of high-temperature steam is to the stock solution on heat transfer board surface for the stock solution intensifies rapidly, and then evaporates the moisture in the stock solution, reduces its moisture content, reaches the effect of concentrated stock solution. The water in the stock solution is evaporated to form secondary steam, and the secondary steam is discharged from a steam exhaust port at the top of the evaporator 12. The water in the stock solution is evaporated, the concentration of the stock solution rises, and because the stock solution has complex components and contains a large amount of salt and organic matters, the stock solution forms thick concentrated solution after being concentrated, and the scraper in the evaporator 12 is driven by the driving assembly to reciprocate along the surface of the heat exchange plate to scrape the concentrated solution. The concentrate is scraped into the bottom hot well 14. The concentrated solution flowing into the hot well 14 is pumped back to the evaporator 12 again by the circulating pump 42, and is evaporated and concentrated again until a certain concentration is reached.
After the concentrated solution is evaporated and concentrated for a plurality of times, the concentration reaches the target concentration, and the concentrated solution valve 63 is opened and flows into the drier 43 under the action of the concentrated solution pump 41. The drier 43 flows into the heat exchange plate tube through high-temperature steam, the concentrated solution flows on the heat exchange plate and exchanges heat with the high-temperature steam in the heat exchange plate tube, the moisture in the concentrated solution is quickly evaporated, and the concentrated solution is dehydrated in a short time to form a solidified substance. The solidified material is discharged to the outside through a discharge port 44 at the bottom of the drier 43.
In the process of heat exchange of the stock solution in the evaporator 12, the high-temperature steam in the heat exchanger is subjected to exothermic liquefaction reaction to form distilled water, and the distilled water flows to the bottom of the steam box and flows into the distilled water tank 31; during the drying process of the concentrated solution in the dryer 43, condensed water is formed and flows into the distilled water tank 31 from the bottom of the dryer device. After the distilled water valve 62 is opened, the distilled water in the water tank is pumped into the heat exchanger 33 through the distilled water pump 32, and the high-temperature distilled water is in the heat exchanger 33, so that the heat is transferred to the stock solution, and the temperature of the stock solution is increased.
In addition, during the evaporation drying process of the stock solution and the concentrated solution, the temperature in the evaporator 12 and the dryer 43 rises, and the moisture in the stock solution and the concentrated solution evaporates, so that secondary steam is formed. At the moment, the steam generating tank 11 or external fresh steam stops generating steam, trace steam is not supplemented enough, the steam compressor 51 starts to work, secondary steam flows into the steam compressor 51 and then is compressed again to raise the temperature, the secondary steam becomes a regenerative heat source, and the regenerative heat source is respectively pumped into the heat exchange plate pipe of the evaporator 12 and the heat exchange plate pipe of the drier 43, so that the stock solution is continuously evaporated and concentrated, the concentrated solution is heated and dried, heat energy is recycled, and the effects of energy conservation and environmental protection are achieved. Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (8)
1. A liquid evaporation, concentration and drying integrated treatment method is characterized by comprising the following steps:
the method comprises the following steps: pumping the stock solution into an evaporator through a feed pump, feeding high-temperature steam into a heat exchanger in the evaporator, heating the stock solution by the evaporator, and evaporating and concentrating;
step two: evaporating and concentrating the stock solution in an evaporator to form a concentrated solution, performing heat exchange and evaporation concentration through a heat exchanger in the evaporator, and enabling the concentrated solution to flow into a hot well at the bottom of the evaporator;
step three: mixing the concentrated solution in the hot well with the stock solution, pumping the mixture back to the evaporator through a circulating pump, evaporating and concentrating again, and continuously circularly evaporating;
step four: and pumping the concentrated solution to a drier by a concentrated solution pump after the concentrated solution reaches a target concentration, feeding high-temperature steam into a heat exchanger in the drier, and evaporating and drying the concentrated solution by the drier until the concentrated solution is completely dehydrated to form a cured substance and the cured substance is discharged out of the equipment.
2. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the first step, the stock solution is pumped into the evaporator and then sprayed on the heat exchange plate pipe through the spraying pipeline, high-temperature steam flows into the heat exchange channel in the heat exchange plate pipe, and the stock solution contacts the pipe wall of the heat exchange plate pipe to exchange heat with the high-temperature steam in the plate pipe, so that the liquid is heated and evaporated and concentrated.
3. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: and in the first step and the fourth step, distilled water is generated when the evaporator evaporates the stock solution and the drier dries the concentrated solution, the distilled water is pumped into the heat exchanger through the distilled water pump, the distilled water exchanges heat with the stock solution in the heat exchanger, and the stock solution is pumped into the evaporator through the feeding pump after being heated.
4. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the first step and the fourth step, secondary steam is generated when the evaporator evaporates the stock solution and the drier dries the concentrated solution, flows into the steam compressor to be compressed and heated, and is pumped back to the evaporator and the drier again.
5. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the first step, the evaporator uses high-temperature steam or external fresh steam generated by the steam generating tank as a preheating heat source to exchange heat with the stock solution, so that the stock solution is heated and evaporated and concentrated.
6. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: and in the fourth step, the concentration of the liquid reaches the target concentration after the liquid is circularly evaporated and concentrated, the concentrated solution valve is opened, and the concentrated solution is pumped into the drier through the concentrated solution pump.
7. The integrated treatment method for evaporation, concentration and drying of liquid according to claim 1, characterized in that: in the fourth step, the high-temperature steam flows into the heat exchange plate pipe in the drier equipment, and the high-temperature steam exchanges heat with the concentrated solution outside the heat exchange plate pipe, so that the concentrated solution is evaporated and dried to form a cured substance.
8. The integrated treatment method of evaporation, concentration and drying of liquid according to any one of claims 1, 4 or 5, characterized in that: after the steam generating tank or the external fresh steam works for a period of time, the steam generating tank stops generating the steam, the steam compressor starts to work, and high-temperature steam is continuously provided for the evaporator and the drier.
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| CN202010423410.2A CN111544910A (en) | 2020-05-19 | 2020-05-19 | Liquid evaporation, concentration and drying integrated treatment method |
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| CN202010423410.2A CN111544910A (en) | 2020-05-19 | 2020-05-19 | Liquid evaporation, concentration and drying integrated treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113830852A (en) * | 2021-09-30 | 2021-12-24 | 无锡青澄装备科技有限公司 | Energy-saving high processing apparatus who contains salt, high COD waste liquid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105999742A (en) * | 2016-06-29 | 2016-10-12 | 北京伊普国际水务有限公司 | MVR evaporative combination device for percolate and treating method thereof |
| CN209872426U (en) * | 2019-04-02 | 2019-12-31 | 中山市共创机械设备有限公司 | Concentrated solution drying system |
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2020
- 2020-05-19 CN CN202010423410.2A patent/CN111544910A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105999742A (en) * | 2016-06-29 | 2016-10-12 | 北京伊普国际水务有限公司 | MVR evaporative combination device for percolate and treating method thereof |
| CN209872426U (en) * | 2019-04-02 | 2019-12-31 | 中山市共创机械设备有限公司 | Concentrated solution drying system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113830852A (en) * | 2021-09-30 | 2021-12-24 | 无锡青澄装备科技有限公司 | Energy-saving high processing apparatus who contains salt, high COD waste liquid |
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