CN112607962A - Emulsion wastewater treatment method and system - Google Patents
Emulsion wastewater treatment method and system Download PDFInfo
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- CN112607962A CN112607962A CN202011412607.2A CN202011412607A CN112607962A CN 112607962 A CN112607962 A CN 112607962A CN 202011412607 A CN202011412607 A CN 202011412607A CN 112607962 A CN112607962 A CN 112607962A
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- 239000000839 emulsion Substances 0.000 title claims abstract description 43
- 238000004065 wastewater treatment Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000002351 wastewater Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000126 substance Substances 0.000 claims abstract description 26
- 239000012528 membrane Substances 0.000 claims abstract description 22
- 239000000919 ceramic Substances 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 15
- 230000008020 evaporation Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000005188 flotation Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 16
- 238000007599 discharging Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The embodiment of the disclosure provides a method and a system for treating emulsion wastewater, which belong to the technical field of water treatment, and specifically comprise the steps of classifying the emulsion wastewater according to quality, classifying the emulsion wastewater by using a COD index, wherein the COD is less than 50000mg/L, and treating the emulsion wastewater by using a ceramic membrane process; the COD is more than or equal to 50000mg/L and less than 100000mg/L, and a chemical demulsification process is used for disposal; COD is more than or equal to 100000mg/L, the wastewater is treated by an evaporation and concentration process, and the generated wastewater enters a biochemical system for further treatment. Through the treatment scheme disclosed by the invention, the removal efficiency of COD can reach more than 80% to 95%, the generated wastewater enters a biochemical system for further treatment and degradation of COD, the COD of the effluent is less than 150mg/L, and the quality-divided flow treatment of the emulsion is realized.
Description
Technical Field
The disclosure relates to the technical field of water treatment, in particular to a method and a system for treating emulsion wastewater.
Background
The waste water of the emulsion is mainly discharged water after the cyclic use of a preservative, a lubricant and a cooling liquid in the processes of machining and metal surface treatment, is common waste water generated in factory production, and has the characteristics of high COD concentration, high organic matter concentration, high oil content and high chroma, belongs to a difficultly degraded substance, and when a large amount of emulsion enters a sewage treatment system, the emulsion can cause a biochemical system to be incapable of normally working to cause the COD and ammonia nitrogen indexes of biochemical effluent to continuously rise and even collapse in severe cases.
The current domestic common emulsion treatment process comprises the following steps: (1) the physical-chemical method is combined with the biochemical method, the method is suitable for places with low concentration of emulsion and large water amount, the process has low operation cost, good water outlet effect but the defects of higher investment, relatively complex operation management and high requirement on operators; (2) the physical chemical method is combined with the adsorption method, the process has strong applicability and simple and convenient operation, but the active filter material needs to be replaced after the adsorption is saturated, so that the operation cost is increased, (3) the physical chemical method is combined with the membrane filtration, the effluent quality of the wastewater treated by the process is good, the management is convenient, but concentrated solution and backwashing water are difficult to treat, and membrane pores are easy to block. (4) The treatment process is complex and the running cost of the sewage is high. In addition, a single treatment process is poor in adaptability and cannot meet the treatment requirements of emulsions with different concentrations and different types, so that the emulsions with different concentrations and different types need to be classified according to quality and treated respectively to realize effective, rapid and stable treatment, and the generated wastewater can be discharged after being biochemically treated and stably reaches the standard.
To sum up, in the emulsion treatment process, the different kinds of different concentration emulsions, effective, quick, stable processing, the stable operation of guarantee waste water biochemical system is the problem that must solve.
Disclosure of Invention
The invention aims to solve the problems and provides an emulsion wastewater treatment method and system.
The invention provides a method for treating emulsion wastewater, which is characterized in that the emulsion wastewater is classified according to quality, classified according to COD index, and treated by using ceramic membrane process, wherein the COD is less than 50000 mg/L; the COD is more than or equal to 50000mg/L and less than 100000mg/L, and a chemical demulsification process is used for disposal; COD is more than or equal to 100000mg/L, the wastewater is treated by an evaporation and concentration process, and the generated wastewater enters a biochemical system for further treatment.
The invention further provides a treatment system of the emulsion wastewater treatment method, which comprises the following steps:
a ceramic membrane system for treating the low concentration emulsion;
a chemical demulsification system for treating the medium-concentration emulsion;
evaporating the concentration system to treat the high-concentration emulsion;
the regulating tank is arranged behind the ceramic membrane system, the chemical demulsification system and the evaporation concentration system and used for mixing wastewater discharged by the ceramic membrane system, the chemical demulsification system and the evaporation concentration system;
the biochemical treatment system is used for treating the wastewater discharged by the regulating tank;
and the DCS control system is used for automatically controlling the system.
As a further improvement of the invention, the ceramic membrane system further comprises a floating ball liquid level meter and a booster pump which are connected with the DCS control system.
As a further improvement of the invention, the chemical demulsification tank further comprises a floating ball liquid level meter and a water outlet pump which are connected with the DCS control system.
As a further improvement of the invention, an air flotation machine is also arranged behind the chemical demulsification tank. The air floatation machine is used for treating wastewater discharged by the chemical demulsification tank.
As a further improvement of the invention, the ceramic membrane feeding pipeline also comprises a bag filter, and the bag filter is arranged on the ceramic membrane feeding pipeline.
As a further improvement of the invention, an oil-water separator is also arranged in front of the ceramic membrane system and the chemical demulsification tank. The oil-water separator is used for pretreating emulsion.
As a further improvement of the invention, the oil-water separation system also comprises a floating ball liquid level meter and a water outlet pump which are connected with the DCS control system.
As a further improvement of the invention, the regulating reservoir further comprises a floating ball liquid level meter and a water outlet pump which are connected with the DCS control system.
Has the advantages that: according to the invention, after the emulsion is subjected to quality classification, different treatment processes are selected for oil-water separation and emulsion breaking, the removal efficiency of COD can reach 80% -95%, the generated wastewater enters a biochemical system for further treatment and degradation of COD, the COD of the effluent is less than 150mg/L, the emulsion is subjected to quality classification and flow division treatment, the treatment is simple, the use is convenient, the effluent is stable, the rapid treatment of different types of emulsions with different concentrations is realized, the stable operation of a water treatment biochemical system is ensured, the personnel operation intensity is reduced, and the effluent of the biochemical system is stable and reaches the standard.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a processing system according to the present invention;
FIG. 2 is a schematic diagram of the operation of the DCS control system of the present invention;
wherein, 100, an oil-water separator; 110. a floating ball liquid level meter; 120. discharging the water pump; 130. a bag filter; 140. a buffer tank; 150. a floating ball liquid level meter; 160. a booster pump; 170. a ceramic membrane system; 200. an oil-water separator; 210. a floating ball liquid level meter; 220. discharging the water pump; 230. a demulsification tank system; 240. an air flotation machine; 300. an evaporative concentration system; 400. a regulating tank; 410. a lift pump; 420. a floating ball liquid level meter; 500. a biochemical system; DCS control system 600.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
Referring to fig. 1 and 2, an embodiment of the present disclosure provides an emulsion wastewater treatment system, which specifically includes: the ceramic membrane system 170, the chemical demulsification tank 230, the evaporation concentration system 300, the regulating reservoir 400, the biochemical treatment system 500 and the DCS control system 600.
The front end of the ceramic membrane system 170 is provided with an oil-water separator 100, the water outlet pump 120 is automatically controlled according to the floating ball liquid level meter 110, the outlet water passes through a bag filter, the filtering precision is 10-50 microns, and enters the buffer tank 140, the booster pump 160 is automatically controlled according to the floating ball liquid level meter 150, the outlet water enters the regulating tank 400 and enters the biochemical treatment system 500 through the lifting pump 410, and the signals of the equipment are accessed to the DCS control system 600.
The front end of the chemical demulsification tank 230 is provided with an oil-water separator 200, the water outlet pump 220 is automatically controlled according to the floating ball level meter 210, signals of the chemical demulsification tank are connected to a DCS control system, the outlet water enters the chemical demulsification tank 230 for chemical demulsification, clear liquid enters the air floatation machine 240 for separating entrained particles and oil, the outlet water enters the regulating tank 400 and enters the biochemical treatment system 500 through the lifting pump 410.
The evaporation concentration system 300 vaporizes moisture in the emulsion through steam heating, wastewater cooled by the condenser enters the regulating tank 400 and enters the biochemical treatment system 500 through the lifting pump 410, and a system signal is connected to the DCS control system 600.
And the biochemical treatment system 500 is arranged behind the regulating tank 400 and is used for treating wastewater discharged by the ceramic membrane system 170, the air flotation machine 240 and the evaporation concentration system 300.
The control process of the DCS control system 600 is specifically as follows:
the water outlet pump 120 is automatically started and closed according to the high-level and low-level signals of the floating ball liquid level meter 110;
the booster pump 160 is automatically started and closed according to the high-level and low-level signals of the floating ball liquid level meter 150;
the water outlet pump 220 is automatically started and closed according to the high-level and low-level signals of the floating ball liquid level meter 210;
the evaporation concentration system 300 is used for automatically adjusting the opening of the valve to adjust the steam quantity according to the set temperature, carrying out evaporation concentration on the emulsion, and automatically discharging the generated wastewater through liquid level control of a water outlet pump;
the water outlet pump 410 is automatically started and closed according to high and low signals of the floating ball liquid level meter 420.
Through the connection, the treatment system can realize automatic operation by using the DCS control system 600, thereby ensuring the stability of biochemical effluent.
Example 1
The method comprises the steps of classifying the emulsion wastewater according to quality, classifying the emulsion wastewater according to COD index, wherein the COD is less than 50000mg/L, and treating by using a ceramic membrane process; the COD is more than or equal to 50000mg/L and less than 100000mg/L, and a chemical demulsification process is used for disposal; COD is more than or equal to 100000mg/L, the emulsion wastewater is treated by an evaporation and concentration process and is respectively added into the emulsion wastewater treatment systems for treatment, the removal efficiency of the COD after treatment can reach 80-95%, the generated wastewater enters a biochemical system for further treatment and degradation of the COD, and the COD of the effluent is less than 150 mg/L.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (9)
1. The method for treating the emulsion wastewater is characterized in that the emulsion wastewater is classified according to quality, classified according to COD index, and treated by using ceramic membrane process, wherein the COD is less than 50000 mg/L; the COD is more than or equal to 50000mg/L and less than 100000mg/L, and a chemical demulsification process is used for disposal; COD is more than or equal to 100000mg/L, the wastewater is treated by an evaporation and concentration process, and the generated wastewater enters a biochemical system for further treatment.
2. A treatment system for the emulsion wastewater treatment process of claim 1, comprising:
a ceramic membrane system for treating the low concentration emulsion;
a chemical demulsification system for treating the medium-concentration emulsion;
evaporating the concentration system to treat the high-concentration emulsion;
the regulating tank is arranged behind the ceramic membrane system, the chemical demulsification system and the evaporation concentration system and used for mixing wastewater discharged by the ceramic membrane system, the chemical demulsification system and the evaporation concentration system;
the biochemical treatment system is used for treating the wastewater discharged by the regulating tank;
and the DCS control system is used for automatically controlling the system.
3. The treatment system of claim 2, wherein the ceramic membrane system further comprises a float level gauge and a booster pump connected to the DCS control system.
4. The processing system of claim 2, wherein the chemical demulsification tank further comprises a floating ball level meter and an effluent pump, and is connected with the DCS control system.
5. The treatment system of claim 4, wherein an air flotation machine is further arranged behind the chemical demulsification tank.
6. The treatment system of claim 2, further comprising a bag filter mounted on the ceramic membrane feed line.
7. The treatment system of claim 2, further comprising an oil-water separator disposed between the ceramic membrane system and the chemical emulsion breaking tank.
8. The treatment system of claim 7, wherein the oil-water separation system further comprises a float level meter and an effluent pump connected to the DCS control system.
9. The treatment system of claim 2, wherein the conditioning tank further comprises a float level gauge and an effluent pump, connected to the DCS control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011412607.2A CN112607962A (en) | 2020-12-04 | 2020-12-04 | Emulsion wastewater treatment method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011412607.2A CN112607962A (en) | 2020-12-04 | 2020-12-04 | Emulsion wastewater treatment method and system |
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| CN112607962A true CN112607962A (en) | 2021-04-06 |
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