CN210528633U - Wastewater pretreatment system in automobile manufacturing process - Google Patents
Wastewater pretreatment system in automobile manufacturing process Download PDFInfo
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- CN210528633U CN210528633U CN201920939483.XU CN201920939483U CN210528633U CN 210528633 U CN210528633 U CN 210528633U CN 201920939483 U CN201920939483 U CN 201920939483U CN 210528633 U CN210528633 U CN 210528633U
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Abstract
The utility model discloses a useless pretreatment of water system in the automobile manufacturing process, before locating biochemical system, this system includes at least: an emulsified wastewater adjusting tank for collecting emulsified wastewater, a cleaning wastewater adjusting tank for collecting cleaning wastewater, a pre-adjusting tank respectively connected with the emulsified wastewater adjusting tank and the cleaning wastewater adjusting tank for mixing the two types of wastewater and carrying out acidification and demulsification, a paper bag filter connected with the pre-adjusting tank, a circulating box connected with the paper bag filter and an ultrafiltration device connected with the circulating box, the pretreatment process has simple process and convenient control, only needs to control the parameters of each device according to the system requirements, the stable proceeding of the treatment process can be ensured, the removal of petroleum substances and COD can be effectively realized, the pretreatment of waste emulsion and cleaning wastewater generated in the mechanical manufacturing process can be realized, the biochemical treatment of the two types of wastewater can be effectively avoided, the substances in the wastewater kill microorganisms, so that the treatment effect of a biochemical system is influenced, and the biochemical treatment effect is finally improved.
Description
Technical Field
The utility model relates to a sewage treatment field, in particular to waste water pretreatment system in automobile manufacturing process.
Background
The emulsion is used in the manufacturing procedures of automobile engine cylinder bodies, cylinder covers, connecting lines and crankshafts (machining such as metal piece cutting and polishing) to realize the functions of lubrication, cooling and rust prevention, so that the quality of products is improved, and the abrasion of machine tools is reduced. The emulsion can be recycled, but the organic matter content in the emulsion is easy to be higher after long-term use, so that the waste emulsion needs to be discharged periodically in actual operation.
In the cleaning process in the manufacturing process of the automobile parts, the oil stain molecules on the surface of the workpiece are wrapped by the surfactant aqueous solution so as to take away the oil stain from the surface of the workpiece, so that in the cleaning wastewater after cleaning, the surfactant molecules wrap the oil stain molecules on the surface of the workpiece and are highly dispersed in the cleaning wastewater. In particular, the washing waste water generated in the engine manufacturing process contains a certain amount of petroleum substances.
The surfactant and the mechanical oil belong to organic matters which are difficult to biodegrade, and can kill microorganisms when directly entering a biochemical system, so that the treatment effect of the biochemical system is poor. Therefore, two kinds of wastewater need to be pretreated at the same time before entering the biochemical treatment system, which is a problem to be solved in the current automobile manufacturing wastewater treatment method.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of the prior art, the embodiment of the utility model provides a wastewater pretreatment system in the automobile manufacturing process has realized the waste emulsion and the preliminary treatment of washing waste water that produce in the machine-building process to detach petroleum class material and COD.
In order to solve the above technical problem, the utility model provides a following first technical scheme:
a system for pretreating wastewater from an automotive manufacturing process, said system being disposed before a biochemical system, said system comprising at least: collect the emulsification wastewater equalizing basin of emulsification wastewater, collect washing wastewater's washing wastewater equalizing basin, respectively with emulsification wastewater equalizing basin and washing wastewater equalizing basin are connected in order to mix two kinds of waste water and carry out the preconditioning tank of acidizing breakdown of emulsion, with the container bag filter that the preconditioning tank is connected, with circulation case that the container bag filter is connected and with the ultrafiltration device that the circulation case is connected, ultrafiltration device includes first ultrafiltration unit at least, first ultrafiltration unit includes first penetrant export and first concentrate export, first penetrant export with biochemical system connects, first concentrate export with circulation case connects and realizes the loop filter.
In some embodiments, the ultrafiltration device further comprises a second ultrafiltration unit arranged in parallel with the first ultrafiltration unit, the second ultrafiltration unit comprising a second permeate outlet and a second concentrate outlet, the second permeate outlet being connected to the biochemical system, the second concentrate outlet being connected to the circulation tank to achieve circulation filtration.
In some embodiments, the system further comprises a feed pump disposed between the circulation tank and the ultrafiltration device, and a first circulation pump disposed between the feed pump and the first or second ultrafiltration unit.
In some embodiments, the system further comprises a washing device comprising a washing pump and a washing tank connected to each other, one end of the washing device being connected to the first circulation pump, respectively, and the other end of the washing device being connected to the first permeate outlet side or the second permeate outlet side, respectively.
In some embodiments, the system further comprises a waste tank connected to the circulation tank for collecting the concentrate.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
the utility model discloses a waste water pretreatment system in the automobile manufacturing process, it carries out devices such as infiltration filtration and circulation filtration through setting gradually the tank of presetting acidification breakdown of emulsion, container bag filtration, ultrafiltration apparatus, can effectively realize the removal to petroleum class material and COD, realize carrying out the preliminary treatment to the waste emulsion and the washing waste water that produce in the machine-building process, when effectively avoiding in these two kinds of waste water when carrying out biochemical treatment, the material kills the microorganism in the waste water thereby influences biochemical system treatment effect, finally improves biochemical treatment effect;
the utility model discloses still protect a waste water preliminary treatment method in the automobile manufacturing process, its process flow is simple, and control is convenient, only needs to control each device parameter according to the system requirement, just can ensure the steady operation of useless emulsion and washing wastewater treatment, and effluent quality of water can reach the requirement of maximum biodegradability, and the treatment effect who obtains satisfies: the oil removal rate is more than 98%, the COD removal rate is about 90%, the BOD removal rate is about 80%, the SS removal rate is about 98%, and the biochemical ratio of ultrafiltration effluent (penetrating fluid) is improved from 0.15 to 0.25, and the ultrafiltration effluent can directly enter a biochemical system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a structural diagram of a wastewater pretreatment system in an automobile manufacturing process according to an embodiment of the present invention;
fig. 2 is a flow chart of a wastewater pretreatment system in an automobile manufacturing process according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be understood that the terms "X axis", "Y axis", "Z axis", "vertical", "parallel", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention provides a system and method for pretreating wastewater in an automobile manufacturing process, which are described in detail below with reference to the accompanying drawings 1-2.
Example 1
As shown in fig. 1, the present embodiment provides a system 100 for pretreating wastewater in an automobile manufacturing process, which is disposed before a biochemical system, the system 100 at least comprising: the device comprises an emulsified wastewater adjusting tank 1 for collecting emulsified wastewater, a cleaning wastewater adjusting tank 2 for collecting cleaning wastewater, a pre-adjusting tank 3 respectively connected with the emulsified wastewater adjusting tank 1 and the cleaning wastewater adjusting tank 2 for mixing two types of wastewater and performing acidification and demulsification, a paper bag filter 4 connected with the pre-adjusting tank 3, a circulating box 5 connected with the paper bag filter 4 and an ultrafiltration device 6 connected with the circulating box 5.
Specifically, the emulsified waste water regulating tank 1 receives waste emulsion generated by cutting and polishing of metal pieces through an emulsion pipeline. Emulsification wastewater equalizing basin 1, the preliminary filtration of accessible metal waste residue and other particulate matter in with waste emulsion also can make the metal ion who makes in the waste emulsion through technologies such as sedimentation turn into the sediment and detach, can also set up agitating unit, and the waste emulsion after will preliminary filtration stirs evenly, makes the waste emulsion that gets into follow-up device have even concentration to ensure process parameter's stability. The cleaning wastewater adjusting tank 2 receives cleaning wastewater generated by cleaning a machining workpiece through a cleaning wastewater pipeline. Similarly, the cleaning wastewater can be subjected to primary treatment by processes such as primary filtration, sedimentation, stirring and the like.
The waste emulsion and the cleaning wastewater are pumped into the pre-adjusting tank 3 through a pressure pump respectively. The pre-adjusting tank 3 is used for mixing the waste emulsion and the cleaning wastewater and carrying out acidification and demulsification on the mixed first mixed solution. And flow meters are respectively arranged at the outlets of the emulsified wastewater regulating tank 1 and the cleaning wastewater regulating tank 2 to control the flow rate ratio of the waste emulsion to the cleaning wastewater, so that the waste emulsion and the cleaning wastewater in the pre-regulating tank 3 are always kept in a certain proportion to ensure the stability of subsequent process parameters.
The acidification pH is usually 4.0 to 6.0, preferably 5.0 in the present embodiment, and the first mixed solution may be adjusted by adding a common acid-base adjusting agent such as hydrochloric acid. In fact, the first mixed solution obtained by mixing the waste emulsion and the cleaning wastewater is still emulsion, and after adding acid, dispersed phase small liquid beads of the emulsion are aggregated to form large liquid drops, and finally, an oil phase and a water phase are separated out in a layered mode to finish layering.
The paper bag filter passes through the filter cloth by the gravity of the liquid to isolate impurities, thereby achieving the aim of purifying the liquid. Work byWhen the dirty liquid carrying impurities flows onto the non-woven fabric through the water flow buffering device, the impurities are separated by the filter cloth to form a filter cake, the filter cake is thicker and thicker, the filter cloth is dragged, the dirt and dirty cloth fall into a dirty paper box, so that the filter cloth is automatically replaced, and the machine enters the next step of filtration circulation. The first filtrate after filtration is conveyed to the next process by a pressure pump. The automatic oil phase filtration can be realized through the paper bag filter 4. Typically, the flow rate of the paper bag filter is 10m3/h。
The circulation box 5 is used for providing the volume of water required by the membrane concentration for the ultrafiltration device 6, meanwhile, the concentrated solution in the ultrafiltration device 6 is collected and sent to the ultrafiltration device 6 again for circulation filtration, and the mixed solution in the circulation box 5 is the second mixed solution. Meanwhile, the system 100 further comprises a waste oil tank 7, and the waste oil tank 7 is connected with the circulating tank 5 for collecting the concentrated solution. When the concentration of the second mixed liquid in the circulation tank 5 reaches the upper concentration limit, the concentrated liquid is discharged into the waste oil tank and is periodically treated.
In order to make the ultrafiltration membrane in the ultrafiltration device 6 have a certain operating pressure and transmembrane pressure difference, the second mixed solution is pressurized twice by the feed pump 81 and the first circulation pump 82 in this order while being fed to the ultrafiltration device 6.
The ultrafiltration device 6 at least comprises a first ultrafiltration unit 9, the first ultrafiltration unit 9 comprises a first penetrating fluid outlet 91 and a first concentrated solution outlet 92, the first penetrating fluid outlet 91 is connected with a biochemical system, and the first concentrated solution outlet 92 is connected with the circulation box 5 to realize the backflow of the concentrated solution into the circulation box 5 so as to realize the circulation filtration. The first ultrafiltration unit 9 is made of an inorganic ceramic membrane, and the inorganic ceramic membrane has the characteristics of high temperature resistance, corrosion resistance, microbial corrosion resistance, convenience in cleaning, easiness in disinfection treatment, good mechanical property, long service life and the like, and is particularly suitable for removing petroleum and COD in the embodiment.
In order to increase the throughput of the system, a plurality of ultrafiltration units arranged in parallel may be provided in the ultrafiltration device 6, and the second mixed liquid after the split flow is filtered. In this embodiment, the ultrafiltration device 6 further includes a second ultrafiltration unit 10 connected in parallel with the first ultrafiltration unit 9, the second ultrafiltration unit 10 includes a second permeate outlet 101 and a second concentrated solution outlet 102, the second permeate outlet 101 is connected to the biochemical system, and the second concentrated solution outlet 102 is connected to the circulation tank 5 to realize circulation filtration. Likewise, a first circulation pump 82 is likewise provided between the feed pump 81 and the second ultrafiltration unit 10 for increasing the liquid pressure.
The system 100 further includes a washing apparatus 11, the washing apparatus 11 includes a washing pump 12 and a washing agent tank 13 connected to each other, one end of the washing apparatus 11 is connected to the upstream of each of the two first circulation pumps 82, and the other end of the washing apparatus 11 is connected to the first permeate outlet 91 side or the second permeate outlet 101 side.
The embodiment provides a waste water pretreatment system in automobile manufacturing process, it adds the acid breakdown of emulsion through setting gradually the preset groove, the container bag filters, ultrafiltration device carries out devices such as infiltration filtration and loop filter, can effectively realize getting rid of petroleum class material and COD, realize carrying out the preliminary treatment to the useless emulsion and the washing waste water that produce in the machine-building process, effectively avoid in these two kinds of waste water when carrying out biochemical treatment, thereby the microorganism is killed to the material in the waste water influences biochemical system treatment, finally improve biochemical treatment effect.
Example 2
Referring to fig. 2, the present embodiment provides a method for pretreating wastewater in an automobile manufacturing process, the method being based on the embodiment 1 and the treatment system, the method at least comprising the following steps:
s1, mixing the emulsified wastewater and the cleaning wastewater in a preset tank according to a certain proportion to obtain a first mixed solution;
s2, adjusting the pH value of the first mixed solution in the pre-adjusting tank to be acidic so as to perform demulsification, and filtering the demulsified first mixed solution through a paper bag filter to remove suspended matters and partial petroleum substances so as to obtain a first filtrate;
and S3, enabling the first filtrate to enter an ultrafiltration device after passing through a circulation box, filtering to remove petroleum substances, enabling the obtained penetrating fluid to enter a biochemical system for biochemical treatment, and enabling the concentrated solution to flow back to the circulation box and then to be filtered again through the ultrafiltration device.
Specifically, through multiple tests, the flow ratio of the emulsified wastewater to the cleaning wastewater flowing into the pre-adjusting tank is 1: 2. Thus, the above flow rate ratio of the two wastewaters can be set by the flow meter.
And adjusting the pH to 4.0-6.0 by adopting one or more of hydrochloric acid, dilute sulfuric acid, acetic acid or citric acid in the pre-adjusting tank, wherein the retention time in the pre-adjusting tank is not less than 60 min. In the step, the initial separation of the water phase and the oil phase can be realized by adding acid for demulsification, and most of the emulsion of the first mixed solution is removed, so that the membrane group flux is improved.
Filtering the separated emulsion layer with a paper bag filter to remove suspended substances and part of petroleum in the first mixed solution to obtain first filtrate, wherein the flow rate of the paper bag filter is 10m3H is used as the reference value. After entering the circulation box, the first filtrate is pressurized and conveyed by the feeding pump and the first circulating pump once and then sent to the ultrafiltration device 6. In the ultrafiltration device in this embodiment, on the premise that the first ultrafiltration unit and the second ultrafiltration unit are arranged in parallel, the first filtrate is divided into two parts, and the two parts respectively pass through the two ultrafiltration units to perform osmotic filtration. After filtration, the concentrated solution on one side of the ultrafiltration membrane flows back to enter a circulating box, and the penetrating fluid obtained on the other side of the ultrafiltration membrane flows into a biochemical system.
When the ultrafiltration device works, the specific technological parameters are as follows: the diameter of the membrane group of the first ultrafiltration unit or the second ultrafiltration unit is 50mm, the flow rate of the membrane surface is 5m/s, the operating pressure is 0.4MPa, the transmembrane pressure difference is 0.15MPa, and the membrane flux is 100L/m2The filtration temperature is (30-60) DEG C, and the concentration multiple is (35-45).
When the concentration of the concentrated solution in the circulating tank 5 reaches the upper concentration limit, the concentrated solution is transferred into a waste oil tank and is periodically transported out for treatment.
When the filtering performance of the ultrafiltration device is reduced, the filtration can be stopped, and the ultrafiltration device is cleaned for many times in a circulating way. The method specifically comprises the following steps: and cleaning chemicals are injected into the ultrafiltration device through the cleaning pump and the first circulating pump to clean and activate the inorganic ceramic membrane, so that the filtering performance is improved. In this embodiment, the cleaning agent may be nitric acid, citric acid, caustic soda, or the like.
The embodiment provides a waste water pretreatment method in automobile manufacturing process, add sour breakdown of emulsion through the preset groove, the container bag filters, ultrafiltration device carries out processes such as infiltration filtration and loop filter, can effectively realize getting rid of petroleum class material and COD, realize carrying out the preliminary treatment to waste emulsion and the washing waste water that produce in the machine-building process, effectively avoid in these two kinds of waste water when carrying out biochemical treatment, thereby the material kills the microorganism in the waste water influences biochemical system treatment effect, finally improve biochemical treatment effect, its process is simple, convenient control, only need control each device parameter according to system requirement, can ensure that treatment process's stability goes on, effluent quality of water is the biggest biochemical nature requirement promptly, the treatment effect who obtains satisfies: the oil removal rate is more than 98%, the COD removal rate is about 90%, the BOD removal rate is about 80%, the SS removal rate is about 98%, and the biochemical ratio of ultrafiltration effluent (penetrating fluid) is improved from 0.15 to 0.25, and the ultrafiltration effluent can directly enter a biochemical system.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A system for pretreating wastewater from the manufacturing process of an automobile, which is disposed before a biochemical system, the system comprising at least: collect the emulsification wastewater equalizing basin of emulsification wastewater, collect washing wastewater's washing wastewater equalizing basin, respectively with emulsification wastewater equalizing basin and washing wastewater equalizing basin are connected in order to mix two kinds of waste water and carry out the preconditioning tank of acidizing breakdown of emulsion, with the container bag filter that the preconditioning tank is connected, with circulation case that the container bag filter is connected and with the ultrafiltration device that the circulation case is connected, ultrafiltration device includes first ultrafiltration unit at least, first ultrafiltration unit includes first penetrant export and first concentrate export, first penetrant export with biochemical system connects, first concentrate export with circulation case connects and realizes the loop filter.
2. The system of claim 1, wherein the system comprises: the ultrafiltration device also comprises a second ultrafiltration unit which is connected with the first ultrafiltration unit in parallel, the second ultrafiltration unit comprises a second penetrating fluid outlet and a second concentrated solution outlet, the second penetrating fluid outlet is connected with the biochemical system, and the second concentrated solution outlet is connected with the circulation box to realize circulation filtration.
3. The system of claim 2, wherein: the system also comprises a feeding pump arranged between the circulating tank and the ultrafiltration device and a first circulating pump arranged between the feeding pump and the first ultrafiltration unit or the second ultrafiltration unit.
4. The system of claim 3, wherein: the system further comprises a cleaning device, the cleaning device comprises a cleaning pump and a cleaning medicine box which are connected with each other, one end of the cleaning device is connected with the first circulating pump respectively, and the other end of the cleaning device is connected with the outlet side of the first penetrating fluid or the outlet side of the second penetrating fluid respectively.
5. The system of claim 1, wherein the system comprises: the system also comprises a waste oil tank, and the waste oil tank is connected with the circulating tank and used for collecting the concentrated solution.
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| CN201920939483.XU CN210528633U (en) | 2019-06-20 | 2019-06-20 | Wastewater pretreatment system in automobile manufacturing process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240319A (en) * | 2019-06-20 | 2019-09-17 | 一汽-大众汽车有限公司 | Waste water pretreatment system and method in a kind of automobile manufacturing process |
| CN114031231A (en) * | 2021-09-28 | 2022-02-11 | 江苏沙钢集团有限公司 | Steel mill passive waste water membrane concentration integrated system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240319A (en) * | 2019-06-20 | 2019-09-17 | 一汽-大众汽车有限公司 | Waste water pretreatment system and method in a kind of automobile manufacturing process |
| CN114031231A (en) * | 2021-09-28 | 2022-02-11 | 江苏沙钢集团有限公司 | Steel mill passive waste water membrane concentration integrated system |
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