Oily wastewater treatment system
By combining an oil separator and a micro-nano flotation tank, the problem of grease and suspended solids in hot rolling laminar flow cooling wastewater was solved, achieving efficient wastewater treatment and safe and stable operation of the circulating water system.
Patent Information
- Application Number
- CN202522441000.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-18
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-11-18
AI Technical Summary
In the hot rolling process, the laminar flow cooling wastewater contains iron oxide scale and waste oil. Direct reuse will lead to scaling, blockage and corrosion of the circulating system equipment, affecting production safety and efficiency.
A combined system of oil separator, oil flotation tank and micro-nano air flotation tank is adopted. The oil collector absorbs the surface oil, and the oil-water is separated, flocculated and flotated by micro-nano air flotation technology to remove suspended solids and impurities.
It achieves efficient removal of grease and suspended solids from wastewater, ensuring that the treated water meets the standards, reducing equipment operating load and costs, and ensuring the safe and stable operation of the circulating water system.
Smart Images
Figure CN223688212U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to wastewater treatment technical field, concretely relates to an oily wastewater treatment system. BACKGROUND
[0002] Hot rolling process is the core technology of steel production that high temperature billet is rolled into specific shape steel, and a large amount of water is needed for cooling, flushing steel and equipment in the hot rolling process, and a hot rolling laminar cooling circulating water system is usually matched, mainly for water supply for strip laminar cooling and side spraying. The hot rolling laminar cooling wastewater after the system runs for a period of time contains iron oxide scale and waste oil, and if directly reused, it will cause scaling, blockage and corrosion of the circulating system equipment, seriously affecting production safety and efficiency, so it must be treated before reuse. SUMMARY
[0003] The utility model aims at providing an oily wastewater treatment system, treating the cooling wastewater, supplementing clean water to the circulating water system and storing and delivering the oil.
[0004] The utility model discloses the following technical scheme.
[0005] An oily wastewater treatment system, comprising an oil separation tank, an oil floating tank and a micro-nano air flotation tank, wherein one side of the oil separation tank is provided with an oil collection groove; a crossbar is arranged in the oil separation tank, and a plurality of oil collectors are arranged on the crossbar; an oil discharge port of each oil collector is connected with an oil conveying hose, and an end of the oil conveying hose away from the oil collector is communicated with the oil collection groove; an oil-water outlet of the oil collection groove is communicated with the oil floating tank; an outlet of the oil floating tank is communicated with the micro-nano air flotation tank; a floating sludge tank is connected with a floating oil outlet of the micro-nano air flotation tank; a water production tank is connected with a clean water outlet of the micro-nano air flotation tank, and the clean water outlet of the micro-nano air flotation tank can also be communicated with a user for other water use links. The oil separation tank is flowed into with the oily wastewater, and the oil in the water floats to the water surface; the oil collectors arranged on the crossbar in the oil separation tank can first suck away the floating oil around the oil collectors and transfer the floating oil to the oil collection groove through the oil conveying hose, and then the floating oil flows into the oil floating tank; the oily wastewater in the oil floating tank has a high oil content, and is treated in the micro-nano air flotation tank; after the treatment, the oil and water are separated, the floating sludge is sent to the floating sludge tank for further treatment, and the clean water is sent to the water production tank for reuse. Compared with the method that the oily wastewater in the oil separation tank is directly treated in the micro-nano air flotation tank, the system reduces the air flotation treatment amount, reduces the operation load, and reduces the equipment cost.
[0006] Further, the oil collector is a floating ball type oil-water adsorber; the support of the oil collector is fixed on the crossbar; the oil conveying hose is connected to the crossbar. The suction inlet of the floating ball type oil-water adsorber is always consistent with the water surface by virtue of its own buoyancy, and the liquid on the surface layer is attracted by the surface tension, so that the floating oil is efficiently absorbed.
[0007] Further, the other side of the oil separation tank away from the oil collecting groove is provided with a concrete platform; the concrete platform is fixed with a base, the top of the base is installed with a gear and rack linear module, and the sliding table of the gear and rack linear module is provided with a moving block; the side wall of the moving block is fixed with a connecting piece, and the end of the connecting piece away from the moving block is connected with the end of the crossbar. The sliding table of the gear and rack linear module moves horizontally under the action of the driving motor, so as to move the connecting piece; the moving block and the crossbar are connected through the connecting piece, which can realize the forward and backward movement of the crossbar along with the horizontal movement of the moving block, and the crossbar can swing under the limiting action of the moving block and the connecting piece, and based on the buoyancy of the oil collector, the crossbar can adjust its height along with the change of the water level, so as to realize the forward and backward movement of the crossbar in the oil separation tank, and more floating oil can be absorbed.
[0008] Further, the connecting piece comprises a fixed ring, a limiting rod and a moving ring; the fixed ring is fixed on the side wall of the moving block; the moving ring is rotatably connected with the end of the crossbar; the limiting rod is provided with a first rotating hole and a second rotating hole at two ends respectively, the fixed ring is rotatably connected with the limiting rod through the first rotating hole, and the moving ring is rotatably connected with the limiting rod through the second rotating hole. The structure can make the crossbar move up and down within the length range of the connecting piece, and is more suitable for oil separation tanks with different water levels.
[0009] Further, the oil collecting groove comprises a water blocking wall, the water blocking wall is provided with a through hole, and the end of the oil conveying hose is communicated with the through hole; the bottom of the oil collecting groove is inclined downward along the direction of wastewater flow; the rear end of the oil collecting groove is provided with an oil-water outlet; and the height of the water inlet of the floating oil tank is lower than that of the oil-water outlet. Under the traction of the moving block and the connecting piece, the crossbar moves on the water surface of the oil separation tank and collects oil, the oil and water absorbed by the oil collector enter the oil collecting groove through the oil conveying hose, flow to the rear end of the oil collecting groove along the inclined direction of the oil collecting groove, and enter the floating oil tank through the oil-water outlet.
[0010] Further, the micro-nano air floatation tank is sequentially provided with a flocculation stirring area, an air floatation mixing area and a slag scraping area along the direction of wastewater flow; the wastewater inlet of the flocculation stirring area is communicated with the oil floating tank through a lifting pump, the medicament inlet of the flocculation stirring area is communicated with a PAC storage tank and a PAM storage tank, and a stirrer is arranged in the flocculation stirring area; the air floatation mixing area is connected with a dissolved air releasing device; a slag scraper is arranged on the top of the slag scraping area, the bottom of the end of the slag scraper away from the flocculation stirring area is the floating slag tank, and the lower part of the slag scraping area is provided with a clean water outlet communicated with the water production tank. Micro-nano bubbles generally refer to micro bubbles with a diameter of 10-50 μm existing in water, and have the characteristics of large specific surface area, long residence time in water, self-pressurized dissolution, high interfacial potential and strong mass transfer efficiency. The floating oil in the wastewater is collected and concentrated by the oil collector, transferred to the oil collecting groove by the oil transfer hose, and then flows into the oil floating tank, and then is sucked into the micro-nano air floatation tank by the lifting pump. The oil and water first enter the flocculation stirring area, are stirred by adding PAC and PAM, and all the suspended matters in the water are flocculated into large particles, and then enter the air floatation mixing area, and are mixed with the dissolved air water released by the dissolved air releasing device. The dissolved air water is released under reduced pressure in the micro-nano air floatation tank, and the air dissolved in the water is separated out in the form of micro-nano bubbles. The bubbles adhere to the suspended floc in the water by virtue of the high surface area adsorption capacity, so that the specific gravity of the suspended floc in the wastewater is reduced, and the suspended floc floats to the water surface together with the bubbles to form a large amount of floating slag. The impurities, such as oxide scale, which do not float, are precipitated at the bottom of the air floatation mixing area and the slag scraping area, and are treated once in a period of time. The clean water in the lower layer flows to the water production tank through the clean water outlet, a part of which is returned to be used for dissolving air, and the remaining clean water flows out through the overflow port to be recycled in the hot rolling laminar cooling circulating water system. When the floating slag on the water surface of the slag scraping area accumulates to a certain thickness, the slag scraper scrapes the floating slag into the floating slag tank and then discharges it, so that the effect of removing impurities and purifying water is achieved.
[0011] Beneficial effects: The system processes wastewater, i.e. oil-containing wastewater, which contains a large amount of suspended matters such as oil. The system uses an oil collector to absorb a large amount of oil suspended on the surface of the wastewater, and then processes the wastewater through a micro-nano air floatation tank to further remove impurities such as oil in the wastewater. The processing system is simple to operate, has good processing effect, and is stable in operation, and can effectively ensure that the oil-removed wastewater meets the discharge standard. BRIEF DESCRIPTION OF DRAWINGS
[0012] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0013] Figure 1It is a kind of oily wastewater treatment system overall structure schematic diagram;
[0014] Figure 2 It is a kind of oily wastewater treatment system oil separation tank, floating oil tank overhead schematic diagram;
[0015] Figure 3 It is Figure 2 The enlarged schematic diagram of connecting piece;
[0016] Figure 4 It is the structure schematic diagram of connecting piece limit rod;
[0017] Figure 5 It is a kind of oily wastewater treatment system oil separation tank structure schematic diagram;
[0018] Figure 6 It is a kind of oily wastewater treatment system oil separation tank, floating oil tank structure schematic diagram.
[0019] The drawings are described as follows:
[0020] 1, oil separation tank;11, oil collection groove;111, water retaining wall;112, through hole;113, oil-water outlet;2, floating oil tank;3, micro-nano air flotation tank;31, flocculation stirring zone;32, air flotation mixing zone;33, slag scraping zone;34, PAC storage tank;35, PAM storage tank;36, mixer;37, dissolved air release device;38, slag scraper;4, floating slag tank;5, water production tank;6, cross bar;61, oil collector;62, oil transfer hose;7, concrete platform;71, base;72, rack and pinion linear module;721, linear guide rail;722, sliding table;723, driving motor;73, moving block;8, connecting piece;81, fixed ring;82, limit rod;821, first rotating hole;822, second rotating hole;83, moving ring;9, lifting pump. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. In the description of the present application, it should be noted that the directions or position relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements indicated must have a particular direction, be constructed and operated in a particular direction, and thus cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0022] Embodiment 1
[0023] An oily wastewater treatment system, as shown in Figure 1 , Figure 2 , includes an oil separation tank 1, an oil floating tank 2, and a micro-nano air flotation tank 3.
[0024] An oil collection tank 11 is arranged on one side of the oil separation tank 1, and the oil collection tank 11 comprises a water retaining wall 111. A through hole 112 is formed in the water retaining wall 111. The bottom of the oil collection tank 11 is inclined downward along the direction of wastewater flow. An oil-water outlet 113 is formed at the rear end of the oil collection tank 11 (the water inlet direction of the oil separation tank 1 is the front end, and the water outlet direction is the rear end), so as to facilitate the outflow of oil and water in the oil collection tank 11. A crossbar 6 is arranged in the oil separation tank 1. Four oil collectors 61 are arranged on the crossbar 6. The oil collectors 61 are floating ball type oil-water adsorbers. In this embodiment, the floating ball type oil-water adsorber is a Namar three-ball floating oil collection device. The supports of the oil collectors 61 are fixed on the crossbar 6. An oil delivery hose 62 is connected to the oil discharge port of each oil collector 61. The oil delivery hose 62 is connected to the crossbar 6. The end of the oil delivery hose 62 away from the oil collector 61 is in communication with the through hole 112 and the inside of the oil collection tank 11. In this embodiment, the ends of the four oil delivery hoses 62 corresponding to the four oil collectors 61 are connected to a thick-diameter hose through a five-way pipe. A flange plate is fixed at the through hole 112 of the water retaining wall 111. A flange plate is fixed to the end of the thick-diameter hose away from the oil collector 61. Then, the two flange plates are fixed together by a bolt structure, so as to realize the connection between the oil delivery hose 62 and the through hole 112. In addition, an oil collection pump can also be installed on the crossbar 6. The liquid outlet of the oil collection pump is also connected to the oil collection tank 11 through a pipeline. When the water quantity is large, the oil collection pump is started to absorb oil, which is beneficial to assisting the oil collectors 61 to quickly and efficiently absorb oil. The oil-water outlet 113 of the oil collection tank 11 is in communication with a floating oil tank 2. Specifically, the floating oil tank 2 is arranged close to the rear end of the oil separation tank 1. The top of the floating oil tank 2 is not closed, and can serve as the water inlet of the floating oil tank 2. The height of the water inlet of the floating oil tank 2 is lower than the height of the oil-water outlet 113. Based on the inclined structure of the bottom of the oil collection tank 11, the oil and water in the oil collection tank 11 can flow into the floating oil tank 2 by itself. The floating oil tank 2 can also not be close to the oil separation tank 1. A pipeline is arranged between the oil-water outlet 113 and the water inlet of the floating oil tank 2. The height of the water inlet of the floating oil tank 2 is lower than the height of the oil-water outlet 113, so that the water inlet of the pipeline is higher than the water outlet, and the oil and water in the oil collection tank 11 can flow into the floating oil tank 2 by itself. The liquid outlet of the floating oil tank 2 is in communication with a micro-nano air flotation tank 3. A floating sludge tank 4 is connected to the floating oil outlet of the micro-nano air flotation tank 3. A water production tank 5 is connected to the clean water outlet of the micro-nano air flotation tank 3.
[0025] As shown in Figures 2-6 Another side of the oil separation tank 1 away from the oil collection tank 11 is provided with a concrete platform 7. A base 71 is fixed on the concrete platform 7. A gear and rack linear module 72 is installed on the top of the base 71. The gear and rack linear module 72 is a product in the prior art, which comprises a linear guide rail 721 and a sliding table 722 sliding on the linear guide rail 721 under the drive of a driving motor 723. A moving block 73 is arranged on the sliding table 722 of the gear and rack linear module 72.
[0026] The side wall of the moving block 73 is fixed with a connecting piece 8, one end of the connecting piece 8 away from the moving block 73 is connected with the end of the cross rod 6. In the embodiment, the connecting piece 8 comprises a fixing ring 81, a limiting rod 82 and a moving ring 83; the fixing ring 81 is fixed on the side wall of the moving block 73; the moving ring 83 is rotationally connected with the end of the cross rod 6; the limiting rod 82 is provided with a first rotating hole 821 and a second rotating hole 822 at two ends respectively; the fixing ring 81 is rotationally connected with the limiting rod 82 through the first rotating hole 821, and the moving ring 83 is rotationally connected with the limiting rod 82 through the second rotating hole 822. The height of the through hole 112 is lower than the lowest height of the moving ring 83, so that the oil and water in the oil conveying hose 62 can flow into the oil collecting groove 11 through the through hole 112.
[0027] The micro-nano air flotation tank 3 is sequentially provided with a flocculation stirring area 31, an air flotation mixing area 32 and a slag scraping area 33 along the direction of wastewater flow; the micro-nano air flotation tank 3 in the embodiment is a GF type combined air flotation machine of Wuxi Gongyuan Environmental Equipment Technology Co., Ltd., and the specific structure not written in the utility model can be obtained according to the structure of the GF type combined air flotation machine; the wastewater inlet of the flocculation stirring area 31 is communicated with the water outlet of the oil floating tank 2 through the lifting pump 9; the reagent inlet of the flocculation stirring area 31 is communicated with a PAC storage tank 34 and a PAM storage tank 35; the flocculation stirring area 31 is provided with a stirrer 36, the stirrer 36 comprises a motor, a stirring shaft, stirring blades and the like, and is a conventional stirrer, and the detailed structure will not be described herein; the air flotation mixing area 32 is connected with a dissolved air releasing device 37; the top of the slag scraping area 33 is provided with a slag scraper 38, the slag floating tank 4 is arranged below the end of the slag scraper 38 away from the flocculation stirring area 31, and the lower part of the slag scraping area 33 is provided with a clean water outlet communicated with the water production tank 5.
[0028] In use, the oil-containing wastewater is discharged into the oil separation tank 1, the cross rod 6 floats on the water surface to absorb oil under the action of the floating force of the oil collector 61 and the traction of the connecting piece 8, the driving motor 723 of the rack and pinion linear module 72 is started to drive the sliding table 722 to move on the linear guide rail 721, the moving block 73 is driven to move horizontally, and then the connecting piece 8 is moved to drive the cross rod 6 to move back and forth on the water surface of the entire oil separation tank 1. The oil collector absorbs most of the water surface oil and transfers it to the oil collection tank 11 through the oil transfer hose 62, and the bottom of the oil collection tank 11 is inclined to make the oil and water entering the oil collection tank 11 flow to the rear end of the oil collection tank 11, and then flow into the floating oil tank 2 through the oil and water outlet 113. The oil and water in the floating oil tank 2 are sucked into the micro-nano air flotation tank 3 by the lifting pump 9, the oil and water first enter the flocculation stirring area 31, and are stirred by adding PAC and PAM to flocculate all suspended solids in the water into large particles, and then enter the air flotation mixing area 32 and mix with the dissolved air released by the dissolved air releasing device 37. The dissolved air is released in the micro-nano air flotation tank 3, and the air dissolved in the water is precipitated in the form of micro-nano bubbles. The bubbles adhere to the suspended flocs in the water by virtue of their high surface area adsorption capacity, making the specific gravity of the suspended flocs in the water smaller. The suspended flocs float to the water surface along with the bubbles, forming a large amount of scum. The un-floated impurities such as iron oxide scale are deposited at the bottom of the air flotation mixing area 32 and the scum scraping area 33, and are treated once every certain period of time. The clear water in the lower layer flows to the water production tank 5 through the clear water outlet, a part of which is returned for use as dissolved air, and the remaining clear water flows out through the overflow outlet and is recycled for use in the hot rolling laminar cooling circulating water system or other purposes.
[0029] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An oil-containing wastewater treatment system, characterized by, It includes oil separation tank, floating oil tank, micro-nano air flotation tank; One side of the oil separation tank is provided with an oil collection groove; The oil separation tank is provided with a cross bar, a plurality of oil collectors are arranged on the cross bar, the oil outlet of the oil collector is connected with an oil conveying hose, one end of the oil conveying hose away from the oil collector is communicated with the oil collection groove; The oil and water outlet of the oil collection groove is communicated with the floating oil tank; The liquid outlet of the floating oil tank is communicated with the micro-nano air flotation tank; The floating oil outlet of the micro-nano air flotation tank is connected with a floating sludge tank, and the clean water outlet of the micro-nano air flotation tank is connected with a water production tank.
2. An oil-containing wastewater treatment system according to claim 1, characterized in that The oil collector is a floating ball type oil and water adsorber; The support of the oil collector is fixed on the cross bar; The oil conveying hose is connected to the cross bar.
3. An oil-bearing wastewater treatment system according to claim 1, wherein The other side of the oil separation tank away from the oil collection groove is provided with a concrete platform; The concrete platform is fixed with a base, a gear and rack linear module is installed on the top of the base, and a moving block is arranged on the sliding table of the gear and rack linear module; The side wall of the moving block is fixed with a connecting piece, and one end of the connecting piece away from the moving block is connected with the end of the cross bar.
4. An oil-bearing wastewater treatment system according to claim 3, wherein The connecting piece comprises a fixed ring, a limiting rod and a moving ring; The fixed ring is fixed on the side wall of the moving block; The moving ring is rotatably connected with the end of the cross bar; The limiting rod is rotatably connected with the fixed ring through the first rotating hole and rotatably connected with the moving ring through the second rotating hole.
5. An oil-bearing wastewater treatment system according to claim 1, wherein The oil collection groove comprises a water retaining wall, the water retaining wall is provided with a through hole, and the end of the oil conveying hose is communicated with the through hole; The bottom of the oil collection groove is inclined downward along the direction of wastewater flow; The rear end of the oil collection groove is provided with an oil and water outlet; The height of the water inlet of the floating oil tank is lower than that of the oil and water outlet.
6. An oil-bearing wastewater treatment system according to claim 1, wherein The micro-nano air flotation tank is sequentially provided with a flocculation stirring area, a air flotation mixing area and a slag scraping area along the direction of wastewater flow; The wastewater inlet of the flocculation stirring area is communicated with the floating oil tank through a lifting pump, the reagent inlet of the flocculation stirring area is communicated with a PAC storage tank and a PAM storage tank, and a stirrer is arranged in the flocculation stirring area; The air flotation mixing area is connected with a dissolved gas releasing device; The top of the slag scraping area is provided with a slag scraper, and the floating sludge tank is arranged below one end of the slag scraper away from the flocculation stirring area; The lower part of the slag scraping area is provided with a clean water outlet communicated with the water production tank.