CN111620460A - Oily wastewater treatment method and device - Google Patents
Oily wastewater treatment method and device Download PDFInfo
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- CN111620460A CN111620460A CN202010372973.3A CN202010372973A CN111620460A CN 111620460 A CN111620460 A CN 111620460A CN 202010372973 A CN202010372973 A CN 202010372973A CN 111620460 A CN111620460 A CN 111620460A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/003—Filters in combination with devices for the removal of liquids
- B01D36/006—Purge means
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- 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
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- 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
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
Abstract
The embodiment of the application discloses a method and a device for treating oily wastewater, wherein the method comprises the following steps: carrying out oil separation treatment on press oil-containing wastewater in an oil-containing wastewater tank through an oil separation tank, and separating into floating oil and mixed water; filtering the floating oil through a filter element filter to obtain oil water with impurities removed; separating and enriching the oil water with impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to an oil-containing wastewater pool; the mixed water is pretreated by a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, the precipitated sludge is guided into a sludge tank, the precipitated oil water is treated by an air floatation machine to obtain air floatation scum and air floatation clear water, the air floatation scum is guided into the sludge tank for treatment, and the air floatation clear water is guided into a clear water tank for recycling production. Solves the problems that the oil-containing wastewater is difficult to recover floating oil and the emulsified oil-containing wastewater is difficult to recycle, and realizes the closed-loop treatment and cyclic utilization of the oil-containing wastewater of the press.
Description
Technical Field
The embodiment of the application relates to the technical field of sewage treatment, in particular to a method and a device for treating oily wastewater.
Background
In the production of products in building material industries such as fiber reinforced cement boards, fiber reinforced calcium silicate boards and the like, a steel template matched with a press is generally prepared by using waste engine oil (containing diesel oil) as a release agent, main pollutants in waste water discharged by product extrusion are suspended substances such as petroleum (waste diesel oil, engine oil and the like), organic matters, inorganic salt particles and the like, the pollutant concentration is high, the organoleptic property is poor, and the main pollutant content comprises petroleum, total hardness and suspended substances.
The current situation and the problems of the treatment of the oily wastewater of the press are as follows: because the building material industries such as fiber reinforced calcium silicate boards, fiber reinforced cement boards and the like do not belong to the heavily polluted industry concerned by environmental protection basically when the environmental protection requirement is not strict, the oily wastewater of the pressing machine of most enterprises is discharged to urban pipelines without being treated. The two-year countries have higher and higher requirements on environmental protection and increasingly strict environmental protection law enforcement, all pollution enterprises enter an environmental protection monitoring range, the environmental protection illegal risks of the enterprises are remarkably increased, and the enterprises begin to attach importance to the environmental protection problem. And a part of enterprises adopt simple oil separation tanks to separate oil (temporarily separate floating oil) for production and recycling. The method has the defects that the treatment is too simple, and the treatment is temporary and permanent: firstly, floating oil is separated temporarily but not treated effectively; secondly, the recycled water contains a large amount of emulsified oil, and the concentration of the emulsified oil and other suspended matters (SS) in the recycled water is higher and higher due to long-term superposition effect, so that the product quality (foaming and layering of the product) is seriously influenced.
Disclosure of Invention
Therefore, the embodiment of the application provides a method and a device for treating oily wastewater, and solves the problems that floating oil in oily wastewater of a press is difficult to recover and emulsified oil-containing wastewater is difficult to recycle.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
according to a first aspect of embodiments of the present application, there is provided a method for treating oil-containing wastewater, the method comprising:
carrying out oil separation treatment on press oil-containing wastewater in an oil-containing wastewater tank through an oil separation tank, and separating into floating oil and mixed water;
filtering the floating oil through a filter element filter to obtain oil water with impurities removed; separating and enriching the oil water with impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to an oil-containing wastewater pool;
the mixed water is pretreated by a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, the precipitated sludge is guided into a sludge tank, the precipitated oil water is treated by an air floatation machine to obtain air floatation scum and air floatation water, the air floatation scum is guided into the sludge tank for treatment, and the air floatation water is guided into a clean water tank for recycling production.
Optionally, the filtering the floating oil by a filter element filter to obtain the oil-water with impurities removed includes:
and filtering the floating oil by a filter element filter to remove suspended matters and inorganic salt particles in the floating oil to obtain the oil-water with impurities removed.
Optionally, the separating and enriching the oil-water from which the impurities are removed by an oil-water separator to obtain an upper layer of oil and a lower layer of oil-water, including:
the oil-water separator separates and enriches the oil water without impurities according to the principle that the oil water is insoluble and has different densities to obtain upper oil and lower oil water.
Optionally, the pretreatment of the mixed water in a coagulation sedimentation tank to obtain precipitated sludge and precipitated oil water comprises:
and adding a flocculating agent and a coagulant aid into the mixed water in the coagulating sedimentation tank to precipitate emulsified oil, suspended matters and inorganic salt particles in the mixed water to obtain precipitated sludge and precipitated oil water.
Optionally, the processing the precipitated oil-water by an air flotation machine to obtain air flotation scum and air flotation clear water includes:
and adding polyaluminum chloride (PAC) and organic macromolecular PAM into the precipitated oil water by the air floatation machine to remove emulsified oil, suspended matters and impurities to obtain air floatation scum and air floatation clear water.
According to a second aspect of embodiments of the present application, there is provided an oil-containing wastewater treatment apparatus, the apparatus including:
the oil separation tank is used for carrying out oil separation treatment on the press oil-containing wastewater in the oil-containing wastewater tank and separating the press oil-containing wastewater into floating oil and mixed water;
the oil-water purification and recovery module is used for filtering the floating oil through a filter element filter to obtain oil water with impurities removed; separating and enriching the oil water with impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to an oil-containing wastewater pool;
and the chemical impurity removal module is used for pretreating the mixed water through a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, guiding the precipitated sludge into a sludge tank, treating the precipitated oil water through an air floatation machine to obtain air floatation scum and air floatation clear water, guiding the air floatation scum into the sludge tank for treatment, and guiding the air floatation clear water into a clear water tank for recycling production.
Optionally, the oil-water purification and recovery module is specifically configured to:
and filtering the floating oil by a filter element filter to remove suspended matters and inorganic salt particles in the floating oil to obtain the oil-water with impurities removed.
Optionally, the oil-water purification and recovery module is specifically configured to:
the oil-water separator separates and enriches the oil water without impurities according to the principle that the oil water is insoluble and has different densities to obtain upper oil and lower oil water.
Optionally, the chemical impurity removal module is specifically configured to:
and adding a flocculating agent and a coagulant aid into the mixed water in the coagulating sedimentation tank to precipitate emulsified oil, suspended matters and inorganic salt particles in the mixed water to obtain precipitated sludge and precipitated oil water.
Optionally, the chemical impurity removal module is specifically configured to:
and adding polyaluminum chloride (PAC) and organic macromolecular PAM into the precipitated oil water by the air floatation machine to remove emulsified oil, suspended matters and impurities to obtain air floatation scum and air floatation clear water.
In summary, according to the method and the device for treating oily wastewater provided by the embodiment of the present application, oily wastewater of a press in an oily wastewater tank is subjected to oil separation treatment through an oil separation tank, and is separated into floating oil and mixed water; filtering the floating oil through a filter element filter to obtain oil water with impurities removed; separating and enriching the oil water with impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to an oil-containing wastewater pool; the mixed water is pretreated by a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, the precipitated sludge is guided into a sludge tank, the precipitated oil water is treated by an air floatation machine to obtain air floatation scum and air floatation clear water, the air floatation scum is guided into the sludge tank for treatment, and the air floatation clear water is guided into a clear water tank for recycling production. Solves the problems that the oil-containing wastewater is difficult to recover floating oil and the emulsified oil-containing wastewater is difficult to recycle, and realizes the closed-loop treatment and cyclic utilization of the oil-containing wastewater of the press.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
FIG. 1 is a schematic flow chart of a method for treating oily wastewater according to an embodiment of the present application;
FIG. 2 is a schematic view of an embodiment of an oily wastewater treatment device provided in the embodiments of the present application;
FIG. 3 is a block diagram of an apparatus for treating oily wastewater according to an embodiment of the present application.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a system solution for efficiently recycling the oily wastewater of the press without discharging the wastewater, and fundamentally solves the problems that the floating oil of the oily wastewater of the press is difficult to recycle and the emulsified oil-containing wastewater is difficult to recycle.
Aiming at the problem that the oil slick is accumulated to be treated after the oil-containing wastewater of the press is subjected to oil separation, the embodiment of the application adopts the oil separation to treat the oil slick after the oil separation through the purification treatment and recovery module, so that the oil standard for demoulding of the press template can be completely met, the problem of oil slick pollution is solved, and the cost of the demoulding agent is reduced due to the recycling of the oil slick, so that economic benefits are generated.
Aiming at the problem of directly recycling the effluent after oil removal, the oil and other suspended matters (SS) in the recycled water have higher and higher concentration due to the superposition effect of a large amount of emulsified oil contained in the recycled water, and the product quality (foaming and layering of the product) is seriously influenced; the oil content of the final effluent of the press oily wastewater treated by the process provided by the embodiment of the application is less than 10mg/L, and the oil content of suspended matters is less than 10mg/L, so that the influence of reuse water on the product quality is thoroughly solved, and the recycling of the press oily wastewater after complete closed-loop treatment is realized.
FIG. 1 is a schematic flow chart of a method for treating oily wastewater, which comprises the following steps:
step 101: and (3) carrying out oil separation treatment on the press oil-containing wastewater in the oil-containing wastewater tank through an oil separation tank, and separating into floating oil and mixed water.
Step 102: filtering the floating oil through a filter element filter to obtain oil water with impurities removed; and separating and enriching the oil water with the impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to the oily wastewater pool.
Step 103: the mixed water is pretreated by a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, the precipitated sludge is guided into a sludge tank, the precipitated oil water is treated by an air floatation machine to obtain air floatation scum and air floatation clear water, the air floatation scum is guided into the sludge tank for treatment, and the air floatation clear water is guided into a clear water tank for recycling production.
In a possible embodiment, in step 102, the filtering the floating oil through a filter element filter to obtain the oil-water with impurities removed includes: and filtering the floating oil by a filter element filter to filter out suspended matters and inorganic salt particles in the floating oil to obtain the oil-water with impurities removed.
In a possible embodiment, in step 102, the separating and enriching the oil-water with impurities removed by the oil-water separator to obtain an upper oil layer and a lower oil-water layer, includes: the oil-water separator separates and enriches the oil water without impurities according to the principle that the oil water is insoluble and has different densities to obtain upper oil and lower oil water.
In a possible embodiment, in step 103, the pre-treating the mixed water through a coagulation sedimentation tank to obtain a precipitated sludge and a precipitated oil water includes: and adding a flocculating agent and a coagulant aid into the mixed water in the coagulating sedimentation tank to precipitate emulsified oil, suspended matters and inorganic salt particles in the mixed water to obtain precipitated sludge and precipitated oil water.
In one possible embodiment, in step 103, the processing the precipitated oil-water by the flotation machine to obtain flotation dross and flotation clear water includes: and adding polyaluminum chloride (PAC) and organic macromolecular PAM into the precipitated oil water by the air floatation machine to remove emulsified oil, suspended matters and impurities to obtain air floatation scum and air floatation clear water.
PAC is used in industrial water treatment for coagulation, forms a network of hundred-like structure degrees in water, and can bind together small solid particles in wastewater. PAM is used as a flocculating agent in industrial water treatment, and organic macromolecules can enlarge solid particles, so that the solid particles sink, and supernatant is colorless and transparent. Fig. 2 shows a flow of pretreatment of oil-containing wastewater and recovery of floating oil in a press according to an embodiment of the present application. The floating oil on the surface layer of the wastewater is recovered and recycled after being carefully selected, so that the problem of treating the floating oil in the oily wastewater is effectively solved. The specific treatment process comprises the following steps:
the oil-containing water of the press is subjected to oil separation treatment by an oil separation tank, and the floating oil and the mixed water recovered at the upper layer enter an oil-water purification and recovery module. The collected oil and water are filtered by a filter element machine to remove suspended matters and inorganic salt particles in the oil and water (principle equivalent mechanical filtration). The oil and water with impurities removed are separated and enriched by an oil-water separator according to the principle that the oil and the water are not mutually soluble and have different densities. Collecting the upper layer enriched oil for recycling production; the oil and water in the lower layer returns to the oily wastewater pool.
And the outlet water of the oil separation tank enters a chemical impurity removal module. The effluent of the oil separation tank enters a coagulating sedimentation process link, and the emulsified oil, suspended matters (SS) and inorganic salt particles in the water form sediment by adding a flocculating agent and a coagulant aid, so that most of the suspended matters, inorganic salt particles and part of the emulsified oil are removed. The purpose of the process is to pretreat the air entering the next process section, purify the water quality, and reduce the working condition and the load pressure of the air flotation process section (reduce the blockage degree of the air flotation process section and delay the blockage cleaning period). The precipitated sludge enters a sludge tank, and the coagulating sedimentation effluent enters an air flotation process section. And recovering the precipitated water to an oil-containing wastewater pool.
The treatment efficiency list of each process section of the press oily wastewater treatment is shown in table 1:
TABLE 1
It can be seen that the problem that floating oil in oil-containing wastewater of a press is difficult to recover and emulsified oil-containing wastewater is difficult to recycle is fundamentally solved in the embodiment of the application. Different from the prior art, the whole process does not use strong acid, strong alkali and the like and does not generate new pollution. After oil removal, the floating oil is treated by the purification and recovery module, so that the oil standard for demoulding of the press template is reached, the problem of floating oil pollution is solved, and the cost of the demoulding agent in production is reduced due to the recycling of the floating oil, so that economic benefits are generated. The oil content of the final effluent of the press oily wastewater treated by the process of the embodiment of the application is less than 10mg/L, and the oil content of suspended matters is less than 10mg/L, so that the influence of reuse water on the product quality is thoroughly solved, and the recycling of the press oily wastewater after complete closed-loop treatment is realized.
In summary, according to the method and the device for treating oily wastewater provided by the embodiment of the present application, oily wastewater of a press in an oily wastewater tank is subjected to oil separation treatment through an oil separation tank, and is separated into floating oil and mixed water; filtering the floating oil through a filter element filter to obtain oil water with impurities removed; separating and enriching the oil water with impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to an oil-containing wastewater pool; the mixed water is pretreated by a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, the precipitated sludge is guided into a sludge tank, the precipitated oil water is treated by an air floatation machine to obtain air floatation scum and air floatation clear water, the air floatation scum is guided into the sludge tank for treatment, and the air floatation clear water is guided into a clear water tank for recycling production. Solves the problems that the oil-containing wastewater is difficult to recover floating oil and the emulsified oil-containing wastewater is difficult to recycle, and realizes the closed-loop treatment and cyclic utilization of the oil-containing wastewater of the press.
Based on the same technical concept, the embodiment of the present application also provides an oily wastewater treatment device, as shown in fig. 3, the device comprising:
and the oil separation tank 301 is used for carrying out oil separation treatment on the press oil-containing wastewater in the oil-containing wastewater tank and separating the press oil-containing wastewater into floating oil and mixed water.
The oil-water purification and recovery module 302 is used for filtering the floating oil through a filter element filter to obtain oil water with impurities removed; and separating and enriching the oil water with the impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to the oily wastewater pool.
And the chemical impurity removal module 303 is used for pretreating the mixed water through a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, guiding the precipitated sludge into a sludge tank, treating the precipitated oil water through an air floatation machine to obtain air floatation scum and air floatation clear water, guiding the air floatation scum into the sludge tank for treatment, and guiding the air floatation clear water into a clear water tank for recycling production.
In a possible implementation, the oil-water purification and recovery module 302 is specifically configured to: and filtering the floating oil by a filter element filter to remove suspended matters and inorganic salt particles in the floating oil to obtain the oil-water with impurities removed.
In a possible implementation, the oil-water purification and recovery module 302 is specifically configured to: the oil-water separator separates and enriches the oil water without impurities according to the principle that the oil water is insoluble and has different densities to obtain upper oil and lower oil water.
In a possible implementation manner, the chemical impurity removal module 302 is specifically configured to: and adding a flocculating agent and a coagulant aid into the mixed water in the coagulating sedimentation tank to precipitate emulsified oil, suspended matters and inorganic salt particles in the mixed water to obtain precipitated sludge and precipitated oil water.
In a possible implementation manner, the chemical impurity removal module 302 is specifically configured to: and adding polyaluminum chloride (PAC) and organic macromolecular PAM into the precipitated oil water by the air floatation machine to remove emulsified oil, suspended matters and impurities to obtain air floatation scum and air floatation clear water.
In the present specification, each embodiment of the method is described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Reference is made to the description of the method embodiments.
It is noted that while the operations of the methods of the present invention are depicted in the drawings in a particular order, this is not a requirement or suggestion that the operations must be performed in this particular order or that all of the illustrated operations must be performed to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
Although the present application provides method steps as in embodiments or flowcharts, additional or fewer steps may be included based on conventional or non-inventive approaches. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an apparatus or client product in practice executes, it may execute sequentially or in parallel (e.g., in a parallel processor or multithreaded processing environment, or even in a distributed data processing environment) according to the embodiments or methods shown in the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
The units, devices, modules, etc. set forth in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the present application, the functions of each module may be implemented in one or more software and/or hardware, or a module implementing the same function may be implemented by a combination of a plurality of sub-modules or sub-units, and the like. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may therefore be considered as a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a mobile terminal, a server, or a network device) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for treating oily wastewater, which is characterized by comprising the following steps:
carrying out oil separation treatment on press oil-containing wastewater in an oil-containing wastewater tank through an oil separation tank, and separating into floating oil and mixed water;
filtering the floating oil through a filter element filter to obtain oil water with impurities removed; separating and enriching the oil water with impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to an oil-containing wastewater pool;
the mixed water is pretreated by a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, the precipitated sludge is guided into a sludge tank, the precipitated oil water is treated by an air floatation machine to obtain air floatation scum and air floatation water, the air floatation scum is guided into the sludge tank for treatment, and the air floatation water is guided into a clean water tank for recycling production.
2. The method of claim 1, wherein filtering the oil slick through a cartridge filter to obtain an impure oil-water comprising:
and filtering the floating oil by a filter element filter to filter out suspended matters and inorganic salt particles in the floating oil to obtain the oil-water with impurities removed.
3. The method of claim 1, wherein separating the contaminant depleted oil-water by a separator to obtain an upper oil layer and a lower oil-water layer comprises:
the oil-water separator separates and enriches the oil water without impurities according to the principle that the oil water is insoluble and has different densities to obtain upper oil and lower oil water.
4. The method of claim 1, wherein pre-treating the mixed water through a coagulation sedimentation tank to obtain a precipitated sludge and a precipitated oil water comprises:
and adding a flocculating agent and a coagulant aid into the mixed water in the coagulating sedimentation tank to precipitate emulsified oil, suspended matters and inorganic salt particles in the mixed water to obtain precipitated sludge and precipitated oil water.
5. The method of claim 1, wherein the subjecting the precipitated oil to an air flotation machine to produce air flotation froth and air flotation clear water comprises:
and adding polyaluminum chloride (PAC) and organic macromolecular PAM into the precipitated oil water by the air floatation machine to remove emulsified oil, suspended matters and impurities to obtain air floatation scum and air floatation clear water.
6. An oil-containing wastewater treatment apparatus, characterized in that the apparatus comprises:
the oil separation tank is used for carrying out oil separation treatment on the press oil-containing wastewater in the oil-containing wastewater tank and separating the press oil-containing wastewater into floating oil and mixed water;
the oil-water purification and recovery module is used for filtering the floating oil through a filter element filter to obtain oil water with impurities removed; separating and enriching the oil water with impurities removed by an oil-water separator to obtain upper oil and lower oil water, collecting the upper oil for recycling production, and returning the lower oil water to an oil-containing wastewater pool;
and the chemical impurity removal module is used for pretreating the mixed water through a coagulating sedimentation tank to obtain precipitated sludge and precipitated oil water, guiding the precipitated sludge into a sludge tank, treating the precipitated oil water through an air floatation machine to obtain air floatation scum and air floatation water, guiding the air floatation scum into the sludge tank for treatment, and guiding the air floatation water into a clean water tank for recycling production.
7. The apparatus of claim 6, wherein the oil water purification recovery module is specifically configured to:
and filtering the floating oil by a filter element filter to filter out suspended matters and inorganic salt particles in the floating oil to obtain the oil-water with impurities removed.
8. The apparatus of claim 6, wherein the oil water purification recovery module is specifically configured to:
the oil-water separator separates and enriches the oil water without impurities according to the principle that the oil water is insoluble and has different densities to obtain upper oil and lower oil water.
9. The apparatus of claim 6, wherein the chemical decontamination module is specifically configured to:
and adding a flocculating agent and a coagulant aid into the mixed water in the coagulating sedimentation tank to precipitate emulsified oil, suspended matters and inorganic salt particles in the mixed water to obtain precipitated sludge and precipitated oil water.
10. The apparatus of claim 6, wherein the chemical decontamination module is specifically configured to:
and adding polyaluminum chloride (PAC) and organic macromolecular PAM into the precipitated oil water by the air floatation machine to remove emulsified oil, suspended matters and impurities to obtain air floatation scum and air floatation clear water.
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