Waste water or feed liquid deoiling device

Abstract

The embodiment of the utility model discloses a wastewater or feed liquid deoiling device. A waste water or feed liquid oil removal device is of a hollow cavity structure and comprises a shell and an inner cavity, the inner cavity is divided into a steady flow area, a coalescence area and a separation area which are communicated, and the steady flow area is separated from the coalescence area through a pore plate; the flow stabilizing area is provided with a wastewater inlet, an elbow, a baffle plate and a sludge collecting bag; the coalescence area is provided with an egg support type corrugated plate and a mud collecting bag; open holes are respectively formed in the tops of the convex parts and the bottoms of the concave parts of the egg support type corrugated plate; and the separation area is provided with a light oil overflow port, a water outlet and a mud collecting bag. The device disclosed by the utility model has a better removal effect on heavy oil, light oil, suspended matters and the like, greatly reduces the treatment cost, is simple to operate, high in integration level and smaller in occupied area, and has a better application prospect.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to the technical field of wastewater treatment, and particularly relates to a wastewater or liquid oil removal device. BACKGROUND

[0002] At present, various industries will produce a large amount of oily wastewater or liquid, such as semi-coke / coking wastewater. In the production process of semi-coke, low-temperature dry distillation process is adopted, and the temperature is relatively low, resulting in a large amount of pollutants in semi-coke wastewater that have not been oxidized at high temperature. The color, oil, COD, SS and other contents of such wastewater are relatively high, and the treatment difficulty is very great. If such wastewater is not pretreated, it will increase the pollution of the subsequent phenol and ammonia recovery unit, the acid removal tower, the ammonia removal tower and the extraction tower, causing the tower plate to be blocked and difficult to clean, and further causing the water discharge indicators to be unqualified. Due to the poor effect of pre-oil removal at the front end, the extraction process will cause the third phase to be too much, the loss of the extraction agent to be serious and other problems, which seriously affect the normal operation of the subsequent process. The conventional pre-oil removal process mainly includes gravity oil removal and air floatation oil removal. The gravity sedimentation period is long, and the oil removal effect is very limited. In addition, it is difficult to separate the large amount of floating oil and residue from the air floatation effluent. When the air floatation aeration is performed, the content of oil and other organic matters is high, and there is a lot of foam, which causes the liquid or foam to overflow to the outside of the equipment, resulting in a poor operating environment and high maintenance cost.

[0003] CN216236320U proposes a anti-blocking semi-coke wastewater oil removal device composed of four-stage oil removal devices. The first-stage oil removal device preliminarily separates light oil and heavy oil by using cyclone centrifugal action. The second-stage and third-stage oil removal devices use coarse filter material and fine filter material for oil removal, respectively. In order to prevent filter material from being blocked, stirring is added in the equipment. The fourth-stage oil removal device uses coalescence material for further oil removal. This technology solves the problem of equipment pollution to some extent, but the cyclone centrifugal equipment for treating large amount of semi-coke wastewater has a high investment, and the addition of stirring in the filter material oil removal device solves the problem of pollution to some extent, but in the stirring process, the oil that has been separated out is further dissolved back into the water body, which greatly reduces the oil removal effect.

[0004] CN215975226U proposes a ceramic ultrafiltration equipment for semi-coke wastewater oil removal treatment process. The equipment mainly uses the process form of gravity oil removal+precision filtration+ceramic ultrafiltration for oil removal. The equipment has a high separation effect on very small organic matters, but the pollution of the precision filter and the ceramic membrane is very serious for semi-coke wastewater, and the cleaning cycle is frequent.

[0005] CN116282731A proposes a treatment method for semi coke phenol ammonia wastewater, which adopts two-stage oil-water separation device for pre-oil removal, which contains demulsification element and oil removal element, wherein the oil removal element is a super oil-wet material with space net fiber structure. The two-stage oil-water separation device can realize the separation of suspended oil, emulsified oil and the like, and has high equipment integration, but the equipment is designed as a tank structure, which is not easy to disassemble and clean, and is easy to cause equipment pollution.

[0006] The non-ferrous metallurgy and power battery recycling industry obtains a certain amount of dispersed oil, emulsified oil or suspended oil in the metal liquid or sodium sulfate / ammonium sulfate wastewater obtained after the extraction process. The presence of such oil causes the oil content in the incoming liquid or wastewater to be too high, affecting the purity and color of the salt obtained by subsequent evaporation crystallization. If direct resin adsorption is used for oil removal, the high oil content in the incoming water causes the resin to be regenerated frequently, increasing the operating cost. Such wastewater usually uses activated carbon adsorption, coalescence resin adsorption, coalescence material adsorption, etc. However, the activated carbon adsorption capacity is limited, and it is not easy to regenerate, and it is usually used once, which is high in cost. The coalescence resin and fiber ball coalescence material have high requirements for the water quality of the incoming water, and the presence of high suspended solids and oil residues can easily cause the resin bed to be blocked. Practical new type content

[0007] Therefore, the embodiments of the present application provide a wastewater or liquid oil removal device, which realizes oil-water separation and solves the problem of equipment pollution, has high equipment integration, is easy to clean, and has remarkable oil removal effect.

[0008] In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:

[0009] According to the first aspect of the embodiments of the present application, the present application provides a wastewater or liquid oil removal device, which is a hollow cavity structure, comprising a shell and an inner cavity, wherein the inner cavity is divided into a stable flow zone, a coalescence zone and a separation zone, and the stable flow zone and the coalescence zone are separated by a hole plate;

[0010] The stable flow zone is provided with a wastewater inlet, an elbow, a baffle plate and a mud collecting bag;

[0011] The coalescence zone is provided with an egg tray type corrugated plate and a mud collecting bag, and the top of the protrusion and the bottom of the depression of the egg tray type corrugated plate are respectively provided with openings;

[0012] The separation zone is provided with a light oil overflow port, a water outlet and a mud collecting bag.

[0013] Further, the elbow is a 90° elbow, one end of which communicates with the wastewater inlet, and the other end vertically downward;

[0014] The baffle plate is arranged below the outlet of the elbow.

[0015] Further, the steady flow area is also provided with a dosing pipeline and / or an aeration pipeline.

[0016] Further, the diameter of the top opening of the convex part is 2mm-2cm, and the diameter of the bottom opening of the concave part is 3mm-5cm.

[0017] The thickness of the egg tray type corrugated plate is 1mm-5mm.

[0018] The inclination angle of the egg tray type corrugated plate is 45°.

[0019] The egg tray type corrugated plate is an oleophilic and hydrophobic material, including PP, PPH, PE, PVDF, PVC, stainless steel and aluminum alloy.

[0020] Further, the surface of the egg tray type corrugated plate is provided with an oleophilic and hydrophobic coating, the contact angle of the oleophilic and hydrophobic coating is >150℃, and the thickness is 0.5mm-2mm.

[0021] Further, the setting method of the oleophilic and hydrophobic coating is as follows:

[0022] (1) uniformly mix 100-200 parts of methyl methacrylate with 0.5-5 parts of initiator sodium persulfate and / or ammonium persulfate, heat to 50-90℃ at a rate of 5-10℃ / min and keep for 1-3h, cool to 30-50℃, to obtain polymer A;

[0023] (2) uniformly mix 1-5 parts of polymer A with 1-5 parts of dimethyldiethoxysilane, 1-5 parts of nano silicon dioxide and 5-50 parts of ethyl acetate, to obtain suspension B;

[0024] (3) immerse the egg tray type corrugated plate in suspension B, or spray suspension B on the surface of the egg tray type corrugated plate, and dry at 40-60℃.

[0025] Further, a plurality of the egg tray type corrugated plates are arranged in a stacking manner, the stacking spacing is 5mm-20mm, and the top opening of the convex part and the bottom opening of the concave part are respectively arranged on corresponding vertical straight lines.

[0026] Further, the wastewater or liquid oil removal device is also provided with a sludge pump, and the sludge pump is in communication with the sludge collecting pockets of the steady flow area, the coalescence area and the separation area.

[0027] According to the second aspect of the embodiment of the utility model, the utility model provides an oil removal process based on the wastewater or liquid oil removal device, and the process comprises the following steps:

[0028] (1) the oil-containing wastewater or liquid passes through the elbow, so that the fluid flow direction is vertically downward, and at the same time, the large particle sludge is settled in the sludge collecting pocket by touching the baffle, to obtain the steady flow area water body;

[0029] (2) The water body in the steady flow zone flows into the coalescence zone through the hole plate, and under the action of the egg tray type corrugated plate, the light oil is floated, and the heavy oil and the particulate matter are settled;

[0030] (3) The light oil is discharged from the light oil overflow port of the separation zone, the heavy oil and the particulate matter are settled in the mud collecting pocket of the separation zone, and the water phase is discharged through the water outlet of the separation zone.

[0031] Further, in step (2), the residence time of the water body in the steady flow zone in the coalescence zone is 1-5 h.

[0032] Further, the pH value of the oil-containing wastewater is 1-14.

[0033] The embodiment of the utility model has the following advantages:

[0034] 1、Can replace gravity oil removal settling tank, reduces gravity settling time.

[0035] The separation theory basis of oil droplets and particles in sewage is Stocks equation, as follows (1)

[0036] (1)

[0037] Wherein, V set The settling velocity of dispersed droplets is m / s;ρ l And ρ h The density of continuous phase and dispersed phase is kg / m 3 ;D i The diameter of dispersed phase droplet is m;η The viscosity of continuous phase is mPa·s.

[0038] As can be seen from formula (1), for a specific sewage, the viscosity and density of water are fixed, and the floating speed of oil droplets is proportional to the square of the size of oil droplets.In the traditional gravity settling tank, coalescence does not occur between oil droplets, the diameter of oil droplets is small, and a high floating distance is needed to reach the oil-water interface, so the settling time is long, as shown in Figure 2 A.

[0039] When small oil droplets collide with the lipophilic group of the egg tray type corrugated plate, coalescence occurs, forming an oil film, and then forming larger oil droplets, and the floating speed of the grown oil droplets is significantly accelerated, and the oil droplets quickly reach the oil-water interface through the oil hole in the vertical direction (i.e., the hole at the top of the egg tray type corrugated plate), realizing efficient separation of the oil-water two-phase.Solid particles or heavy oil particles, after colliding with the surface of the corrugated plate, will deposit on the surface of the corrugated plate due to the blocking effect of the corrugated plate, and the corrugated plate is inclined at an angle of 45°, which is beneficial to the sliding of the particles, so as to be discharged from the sand hole (i.e., the hole at the bottom of the egg tray type corrugated plate), realizing the separation of solid particles, as shown in Figure 2B as shown.

[0040] 2、In the prior art, if the oil content in the wastewater or the feed liquid is too high, demulsification-flocculation treatment needs to be carried out before entering the biochemical tank, thereby increasing the treatment cost and sludge amount. The wastewater or feed liquid oil removal device of the present application can replace the air floatation oil removal tank, reduce the residence time of the air floatation tank, and improve the oil-water separation efficiency.

[0041] 3、The present application can simultaneously remove heavy oil, light oil and suspended solids, and the treatment is physical, thereby greatly reducing the treatment cost and relieving the pollution blocking problems of the deacidification tower, the deamination tower and the extraction tower in the subsequent treatment process of the lignite wastewater.

[0042] 4、For the wastewater of the non-ferrous metallurgical industry, the present application can replace the activated carbon as a pre-oil removal equipment, has a large equipment treatment capacity, does not need to additionally increase an oil-water separation device, has a strong anti-pollution blocking performance compared with the coalescence oil removal material and the fiber ball, and has a lower water quality requirement for the inlet water.

[0043] 5、The conventional corrugated plate has a long slope and no sand discharge port, and when the solid and heavy oil content is high, the corrugated plate is prone to be blocked.

[0044] 6、The present application has high equipment integration, integrates the steady flow zone, the coalescence zone and the separation zone on one equipment, has smaller land occupation, and has simple equipment operation and good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other embodiments can be obtained from the provided drawings without creative labor.

[0046] The structures, proportions, sizes, etc. shown in the present specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0047] Figure 1 A structural schematic view of the wastewater or feed liquid oil removal device provided by the present application;

[0048] Figure 2 A comparison between the traditional gravity sedimentation and the corrugated plate coalescence provided by the present application;

[0049] Figure 3 is the structure diagram of the egg tray type corrugated board provided by the present application, wherein A is a schematic diagram and B is a physical diagram;

[0050] Figure 4 is the stacking structure diagram of the egg tray type corrugated board provided by the present application, wherein A is a schematic diagram and B is a physical diagram;

[0051] Figure 5 The oil removal process flow provided by the present application is shown in the figure;

[0052] Figure 6 The oil removal rate and the suspended matter removal rate of the pyrolysis water provided by the present application embodiment 1 are shown in the figure;

[0053] Figure 7 The oil removal rate and the suspended matter removal rate of the pyrolysis water provided by the present application embodiment 2 are shown in the figure;

[0054] Figure 8 The oil removal rate and the suspended matter removal rate of the ternary ammonium sulfate solution provided by the present application embodiment 3 are shown in the figure;

[0055] In the figure: 1: dosing pipe; 2: pipe mixer; 3: orifice plate; 4: egg tray type corrugated board; 4-1: oil hole; 4-2: sand hole; 5: exhaust port; 6: oil collection tank; 7: light oil overflow port; 8: water outlet; 9: water outlet pipeline; 10: separation zone mud collecting bag; 11: mud discharge pump; 12: fixed rod; 13: mud discharge pipe; 14: aeration pipe; 15: baffle; 16: steady flow zone mud collecting bag; 17: coalescing zone mud collecting bag. DETAILED DESCRIPTION

[0056] The embodiments of the present application will be described in detail by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosed content of the specification. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0057] Referring to Figure 1 The present application provides a kind of wastewater or solution oil removal device, hollow cavity structure, including shell and inner cavity.The material of shell is PP, PPH, stainless steel, carbon steel lining plastic.Inner cavity is divided into three communicating areas, for steady flow zone, coalescing zone and separation zone, wherein, steady flow zone and coalescing zone are separated by orifice plate.

[0058] Steady flow area: provided with a wastewater inlet, a dosing pipe 1, a pipe mixer 2, a bend, a baffle 15 and a steady flow area sludge collecting bag 16. The bend is a 90° elbow, one end of which is communicated with the wastewater inlet pipe and the other end of which is vertically downward. The baffle 15 is arranged below the outlet of the bend. The steady flow area sludge collecting bag is arranged at the bottom of the steady flow area. A blowhole is arranged at the bottom end of the steady flow area sludge collecting bag. The oil-containing wastewater enters the steady flow area, changes the flow direction of the water body vertically downward through the bend, and collides with the baffle 15 at the same time, thereby reducing the influence of the inlet flow rate on the overall fluctuation. At the same time, more large-particle sediment is settled in the steady flow area. The particles collected in the steady flow area sludge collecting bag are discharged through the blowhole. The steady flow area is separated from the coalescence area by a perforated plate 3. In some preferred embodiments, the perforated plate 3 is a stainless steel plate, wherein one or more holes are arranged at the upper position of the perforated plate 3. The size of the holes is 3mm-30mm. The water body in the steady flow area enters the coalescence area through the holes of the perforated plate 3 in an overflow manner, which can reduce the turbulence of the water flow and make the water body enter the coalescence area more gently without disturbing the oil stain coalescence and separation process.

[0059] In some preferred embodiments, the demulsifier is mixed with the oil-containing wastewater through the dosing pipe 1. The demulsifier is a conventional agent used in sewage treatment, such as polyether demulsifier, quaternary ammonium salt demulsifier, amine demulsifier, etc. In some preferred embodiments, an aeration pipe is arranged in the steady flow area. The aeration pipe is a PP pipe with holes. The size of the holes is 1-10mm. The distance between two holes can be selected to be 1-20cm according to the size of the equipment. The aeration pipe is used to pass oxygen, ozone, nitrogen, carbon dioxide and other gases, which plays a role of oxidation or stirring. The arrangement form of the aeration pipe can be "Y" type, "O" type, triangular, square, "mountain" type, etc.

[0060] Coalescence area: provided with an egg tray type corrugated plate. The structure of the egg tray type corrugated plate is shown in FIG. 3. The top of the protrusion and the bottom of the depression are respectively provided with openings. The opening at the top of the protrusion is an oil hole 4-1, and the opening at the bottom of the depression is a sand hole 4-2. The egg tray type corrugated plate is used for the floating and settling of small oil droplets (light oil), heavy oil and particles in the water body in the steady flow area. The lower surface of the egg tray type corrugated plate is used for the coalescence and growth of small oil droplets, and the upper surface is used for the settling of heavy oil and particles. The top oil hole is beneficial to the floating of the oil droplets after growth, and the bottom sand hole is beneficial to the settling of heavy oil and particles. The coalescence area is provided with a coalescence area sludge collecting bag 17 and a blowhole at the bottom, which are used for the collection and discharge of heavy oil stains and suspended particles.

[0061] In some preferred embodiments, the inclination angle of the egg tray type corrugated plate is 45° (see FIG. 4), which is beneficial to the floating of oil droplets and the sinking of heavy oil particles. The diameter of the oil hole is 2mm-2cm, and the diameter of the sand hole is 3mm-5cm. The thickness of the egg tray type corrugated plate is 1mm-5mm. The egg tray type corrugated plate is oleophilic and hydrophobic, including PP, PPH, PE, PVDF, PVC, stainless steel and aluminum alloy.

[0062] In some preferred embodiments, an oleophilic hydrophobic coating is arranged on the surface of the egg tray type corrugated plate, with a thickness of 0.5mm-2mm.

[0063] The method for arranging the oleophilic hydrophobic coating comprises the following steps:

[0064] (1) Mix 100-200 parts of methyl methacrylate with 0.5-5 parts of initiator (persulfate salt, such as sodium persulfate and / or ammonium persulfate), heat to 50-90°C at a rate of 5-10°C / min and keep for 1-3h, then cool to 30-50°C, to obtain polymer A;

[0065] (2) Mix 1-5 parts of polymer A with 1-5 parts of dimethyldiethoxysilane, 1-5 parts of nano-silicon dioxide, and 5-50 parts of ethyl acetate to obtain suspension B;

[0066] (3) Soak the egg tray type corrugated plate in suspension B for 1-2h, and dry at 40-60°C, or spray suspension B onto the surface of the egg tray type corrugated plate, and dry at 40-60°C.

[0067] Tests show that the oleophilic hydrophobic coating obtained by the above method has a contact angle >150°C, is wear-resistant, corrosion-resistant, and has strong antioxidant capacity. Research shows that the egg tray type corrugated plate with the above coating is more conducive to the separation of oil and water, especially for the separation of heavy oil, light oil and suspended solids in pyrolysis wastewater in the semi-coke industry.

[0068] In some preferred embodiments, to improve the oil removal effect, multiple egg tray type corrugated plates are used by stacking, as shown in FIG. 4, A is a stacked structure diagram of multiple egg tray type corrugated plates, and B is a physical (side) view, with a stacking distance of 5mm-20mm. The egg tray type corrugated plate can be designed into a regular square or rectangle, and according to the oil removal requirement, multiple groups can be stacked and used side by side, which can be side by side horizontally or vertically.

[0069] After a certain period of operation, a high-pressure spray gun can be inserted into the sand hole of the egg tray type corrugated plate to clean it with clean water. For special difficult-to-clean blockages, hot water, liquid alkali, or hot steam can be used for immersion cleaning of the egg tray type corrugated plate, with a cleaning time of 0.5-5h.

[0070] The cleaning mode can be in-situ cleaning or cleaning after the egg tray type corrugated plate is removed. Since the egg tray type corrugated plate is stacked and does not need to be fixed, the egg tray type corrugated plate is convenient to disassemble and has strong anti-fouling performance. Especially for the heavy oil dirt such as coal tar coking industry complex wastewater containing coal tar suspended particulate matter, the egg tray type corrugated plate has good applicability. For special difficult-to-clean dirt, the hot water temperature used in the cleaning process is 30-100 DEG C; the liquid alkali concentration is 1%-30%, and the liquid alkali temperature is 30-90 DEG C; and the hot steam temperature is 100-120 DEG C.

[0071] The separation zone is mainly used for separating the light oil droplets, heavy oil particulate matters and water phase after the light oil droplets and the heavy oil particulate matters grow in the coalescence zone. The light oil at the top is stored in the oil collecting groove 6 (if it has utilization value, it can be recycled and purified for utilization) and is further discharged through the light oil overflow port 7. The heavy oil and the sand are discharged from the separation zone sand collecting pocket 10 at the bottom of the separation zone. The treated water is discharged through the water outlet 8 through the water outlet pipeline 9.

[0072] In some preferred embodiments, the water outlet pipeline 9 adopts a 90 elbow bend. The overflow is discharged. The vertical part of the elbow bend is inside the separation zone, and the horizontal part extends outside the tank.

[0073] In some preferred embodiments, for the wastewater of the coal tar industry, both heavy oil dirt and suspended particulate matters and light oil are contained. The inlet of the vertical part of the water outlet pipeline is arranged at the middle position of the entire height of the separation zone. For the water body mainly containing light oil, the inlet is arranged at a position below the middle.

[0074] For the wastewater of the coal tar industry, the wastewater or liquid treatment oil removal device of the utility model can replace the gravity oil removal groove to reduce the sedimentation time. The demulsifying agent can be added through the pipeline mixer in the steady flow zone, and then the wastewater or liquid is introduced into the coalescence zone to replace the air flotation device, reduce the residence time of the air flotation tank, and solve the problem of liquid or foam overflow caused by the aeration stage.

[0075] For the wastewater of the coal tar industry, the wastewater or liquid treatment oil removal device of the utility model can replace the gravity oil removal groove to reduce the sedimentation time. The demulsifying agent can be added through the pipeline mixer in the steady flow zone, and then the wastewater or liquid is introduced into the coalescence zone to replace the air flotation device, reduce the residence time of the air flotation tank, and solve the problem of liquid or foam overflow caused by the aeration stage.

[0076] Embodiment 1

[0077] The embodiment provides an oil removal process based on the wastewater or liquid treatment oil removal device, which comprises the following steps.

[0078] (1) A certain coal enterprise pyrolysis wastewater, appearance is dark brown or black oily sewage, which contains 4000~9000mg / L of oil, 400~1000 mg / L of suspended solids. After centrifugal pump into the pipe mixer 2, through the 90 elbow, change the direction of fluid, down into, and with the inclined plate touch pump into the steady flow area. The silt and heavy oil in the water body first settled in the steady flow area, as a preliminary separation.

[0079] (2) The water body in the steady flow area through the orifice plate 3 evenly overflow into the coalescence area, flow through the egg tray corrugated plate 4, wherein the light oil and heavy oil suspended particles etc. in this area occur coalescence and separation. The top of the convex part of the egg tray corrugated plate is 1cm in diameter, the bottom of the concave part is 2cm in diameter; the egg tray corrugated plate is made of PP plastic with a thickness of 2mm as the base material and is provided with an oil-wet and water-repellent coating with a thickness of 0.5mm on the surface, and the inclination angle is 45°; a plurality of egg tray corrugated plates are arranged by stacking, the stacking distance is 10mm, and the top of the convex part and the bottom of the concave part are respectively arranged on the corresponding vertical straight lines. The residence time of the water body in the coalescence area is 2h. The volatile organic gas generated in the coalescence area is discharged or treated through the exhaust port 5, and part of the heavy oil and suspended particles enter the coalescence area sludge pocket 17 at the bottom, and the sludge pump 11 is opened at regular intervals.

[0080] The setting method of the oil-wet and water-repellent coating is as follows:

[0081] S1, mix 100 parts of methyl methacrylate with 2 parts of sodium persulfate, heat to 80℃ at a rate of 5℃ / min and keep for 3h, then cool to 40℃, and obtain polymer A;

[0082] S2, mix 3 parts of polymer A with 5 parts of dimethyl dioxyhexyl silane, 2 parts of nano silicon dioxide and 15 parts of ethyl acetate to obtain suspension B;

[0083] S3, soak the PP base material after purification and decontamination treatment in suspension B, dry at 60℃ after 2h, and volatilize the solvent.

[0084] (3) into the separation area, the upper layer of floating oil enters the oil collection tank 6 and is accumulated, and then is discharged through the light oil overflow port 7. The heavy oil and suspended particles enter the separation area sludge pocket 10 at the bottom, and the sludge pump 11 is opened at regular intervals. The treated water is discharged through the water outlet 8 of the water outlet pipeline 9 and enters the subsequent section for subsequent treatment.

[0085] Continuous operation for 270h, the operation effect is as follows: Figure 6As shown, the oil removal rate fluctuates between 30~55%, and the suspended matter removal rate fluctuates between 50~75%. Observing the water in and out, the outflow changes from dark brown opaque liquid to red-brown transparent liquid, and the visual effect of oil and suspended matter removal can also be seen.

[0086] Example 2

[0087] This embodiment provides an oil removal process based on a wastewater or feed liquid oil removal device, comprising the following steps:

[0088] (1) The pyrolysis wastewater of a certain carbon enterprise is gravity-degreased and added with air flotation reagent, and the oil content is 4000~6000 mg / L, and the suspended matter content is 100~600 mg / L. The water is pumped into the pipeline mixer by the centrifugal pump, changes the flow direction through the 90° elbow, and enters downward and touches the inclined plate to pump into the steady flow area. The heavy oil dirt such as silt in the water body is first settled in the steady flow area to collect the mud bag 16 as a preliminary separation.

[0089] (2) The water in the steady flow area is uniformly dispersed into the coalescence area through the orifice plate 3, and flows through the egg tray corrugated plate 4, wherein the light oil and heavy oil suspended matter particles are separated in this area. The top opening diameter of the convex part of the egg tray corrugated plate is 5mm, and the bottom opening diameter of the concave part is 2cm; the egg tray corrugated plate is made of stainless steel with a thickness of 3mm, and the surface is provided with an oil-wet hydrophobic coating with a thickness of 1mm, and the inclination angle is 45°; a plurality of egg tray corrugated plates are arranged by stacking, the stacking distance is 15mm, and the top opening of the convex part and the bottom opening of the concave part are respectively arranged on the corresponding vertical straight lines. The residence time of the water body in the coalescence area is 1h. The volatile organic gas generated in the coalescence area is discharged or treated through the exhaust port 5, and part of the heavy oil dirt and suspended particles enter the coalescence area mud collecting bag 17 at the bottom, and the sludge pump 11 is opened at regular intervals to discharge.

[0090] The setting method of the oil-wet hydrophobic coating is as follows:

[0091] S1, uniformly mix 200 parts of methyl methacrylate with 5 parts of ammonium persulfate, heat to 80℃ at a rate of 5℃ / min and keep for 3h, cool to 45℃, and obtain polymer A;

[0092] S2, uniformly mix 5 parts of polymer A with 3 parts of dimethyl dioxyhexyl silane, 5 parts of nano silicon dioxide and 50 parts of ethyl acetate to obtain suspension B;

[0093] S3, immerse the purified and decontaminated stainless steel in the suspension B, dry at 40℃ after 1h, and volatilize the solvent.

[0094] (3) into the separation zone, the upper layer of oil into the oil tank 6 accumulation, through the light oil overflow 7 discharge. Heavy oil and suspended particles into the separation zone at the bottom of the sludge pocket 10, open sludge pump 11 discharge at regular intervals. The treated water through the water outlet 9 water outlet 8 discharge into the subsequent section for subsequent processing.

[0095] Continuous operation 72 h, its operating effect as shown in Figure 7 , oil removal rate fluctuated between 50~90%, suspended solids removal rate fluctuated between 70~90%. The water in and out of the observation, the water color is brown yellow opaque liquid, after treatment, become yellow transparent liquid, visually has obvious effect of oil removal and suspended solids removal.

[0096] Example 3

[0097] The embodiment provides an oil removal process based on a wastewater or liquid oil removal device, comprising the following steps:

[0098] A certain three element industry ammonium sulfate oil wastewater, using the method of example 1 is handled.

[0099] Continuous operation 168 h, its operating effect is seen Figure 8 , water oil content 520~940 mg / L, water oil content 397~460 mg / L, the water in and out of the observation, the water is yellow turbid liquid, the water is close to color slightly turbid, visually has obvious effect of oil removal.

[0100] Although, in the above, the utility model has been described in detail with general description and specific examples, on the basis of the utility model, some modifications or improvements can be made, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model, all belong to the scope of the utility model claimed.

Claims

1. A wastewater or feed liquor oil removal device, characterized by, The device is a hollow cavity structure, including a shell and an inner cavity, the inner cavity is divided into a stable flow area, a coalescence area and a separation area in communication, wherein the stable flow area is separated from the coalescence area by a hole plate; The stable flow area is provided with a wastewater inlet, an elbow, a baffle and a sludge collecting bag; The coalescence area is provided with an egg tray type corrugated plate and a sludge collecting bag, the top of the convex part and the bottom of the concave part of the egg tray type corrugated plate are respectively provided with an opening; The separation area is provided with a light oil overflow port, a water outlet and a sludge collecting bag.

2. The wastewater or feed liquor oil removal device of claim 1, wherein, The material of the shell is PP, PPH, stainless steel or carbon steel lined with plastic.

3. The oil removal device for wastewater or liquid according to claim 1, wherein, The elbow is a 90° elbow, one end of which is in communication with the wastewater inlet, and the other end is vertically downward; The baffle is arranged below the outlet of the elbow.

4. The oil removal device for wastewater or liquid according to claim 1, wherein, The stable flow area is further provided with a dosing pipe and / or an aeration pipeline.

5. The oil removal device for wastewater or liquid according to claim 1, wherein, The diameter of the opening at the top of the convex part is 2mm-2cm, and the diameter of the opening at the bottom of the concave part is 3mm-5cm; The thickness of the egg tray type corrugated plate is 1mm-5mm; The inclination angle of the egg tray type corrugated plate is 45°; The egg tray type corrugated plate is oleophilic and hydrophobic, including PP, PPH, PE, PVDF, PVC, stainless steel and aluminum alloy.

6. The wastewater or feed liquor oil removal device of claim 5, wherein, The surface of the egg tray type corrugated plate is provided with an oleophilic and hydrophobic coating, the contact angle of the coating is >150℃, and the thickness is 0.5mm-2mm.

7. The oil removal device for wastewater or liquid according to claim 1, wherein, A plurality of the egg tray type corrugated plates are arranged by stacking, the stacking distance is 5mm-20mm, and the opening at the top of the convex part and the opening at the bottom of the concave part are respectively arranged on the corresponding vertical straight lines.

8. The oil removal device for wastewater or liquid according to claim 1, wherein, The oil removal device for wastewater or liquid is further provided with a sludge discharge pump, which is in communication with the sludge collecting bags of the stable flow area, the coalescence area and the separation area respectively.

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