Grease organic wastewater treatment device

Abstract

The utility model provides a grease organic wastewater treatment device. And the water inlet end of the mixing and adjusting tank is communicated with the production wastewater discharge assembly. The demulsification reaction unit comprises a first demulsification reaction tank, a second demulsification reaction tank and a vertical flow sedimentation tank, the water inlet end of the first demulsification reaction tank is communicated with the water outlet end of the mixing regulation tank, and the water inlet end of the second demulsification reaction tank is communicated with the water outlet end of the first demulsification reaction tank; the water inlet end of the vertical flow sedimentation tank is communicated with the water outlet end of the second demulsification reaction tank. The water inlet end of the electro-catalysis reaction unit is communicated with the water outlet end of the vertical flow sedimentation tank. The water inlet end of the coagulating sedimentation unit is communicated with the water outlet end of the electro-catalysis reaction unit. The water inlet end of the biochemical reaction unit is communicated with the water outlet end of the coagulating sedimentation unit. The water inlet end of the resin oil removal unit is communicated with the water outlet end of the biochemical reaction unit, and the water outlet end of the resin oil removal unit is communicated with a discharge assembly.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and in particular to a device for treating grease organic wastewater. Background Art

[0002] With the progress of the times, some chemical plants will produce wastewater with high concentration of organic matter and oil in the production process. The wastewater mainly contains surfactants, vegetable oils, waxes, hydrocarbons, synthetic oils and fatty acids, fatty alcohols, lipids, emulsifiers, thickeners, antioxidants, etc. This type of wastewater has complex composition, high COD concentration, high chroma, poor biodegradability, and cannot be directly ingested and utilized by microorganisms. If it is directly discharged, it will cause serious pollution to the water body and destroy the ecological balance. This type of production wastewater must be treated and discharged in compliance with the standards.

[0003] For the treatment of this type of oily organic wastewater, traditional wastewater treatment equipment uses flotation to remove oil. Although it can effectively remove the surface oil in the wastewater, the emulsified oil and dissolved oil in the wastewater with high oil content cannot be eradicated, resulting in the oil content of the wastewater cannot be reduced.

[0004] To this end, a Chinese patent with patent number CN202310120064.4 proposes an oil removal device and method, the oil removal device includes a liquid storage tank, a micro-nano bubble flotation oil removal device, a first shut-off valve, a filter, a second shut-off valve and a polymer resin oil removal device, the liquid storage tank is suitable for storing organic wastewater containing oil and solid particles, the outlet of the liquid storage tank is connected to the inlet of the micro-nano bubble flotation oil removal device through the first shut-off valve, the outlet of the micro-nano bubble flotation oil removal device is connected to the inlet of the filter, the outlet of the liquid storage tank is connected to the inlet of the filter through the second shut-off valve, the outlet of the filter is connected to the inlet of the polymer resin oil removal device, and the polymer resin oil removal device has a drain suitable for discharging the treated organic wastewater. The oil removal equipment of this patent has the advantages of high oil removal efficiency, no introduction of secondary impurities and low oil removal cost.

[0005] However, the above-mentioned oil removal equipment has the following problems:

[0006] Although the above oil removal equipment can remove dissolved oil and emulsified oil through the polymer resin oil removal device, the wastewater contains not only oily organic matter, but also inorganic pollutants, and this oil removal equipment cannot remove the inorganic pollutants in the wastewater.

[0007] Therefore, for the treatment of this type of grease organic wastewater, there is an urgent need for a wastewater treatment device that can effectively remove grease organic matter and inorganic pollutants in the wastewater. Utility Model Content

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a grease organic wastewater treatment device that can effectively remove grease organic matter and inorganic pollutants in wastewater.

[0009] The purpose of this disclosure is achieved through the following technical solutions:

[0010] A grease organic wastewater treatment device, comprising:

[0011] A mixing and regulating tank, wherein the water inlet end of the mixing and regulating tank is connected to the production wastewater discharge component;

[0012] A demulsification reaction unit, wherein the demulsification reaction unit comprises a first demulsification reaction tank, a second demulsification reaction tank and a vertical flow sedimentation tank, wherein the water inlet end of the first demulsification reaction tank is connected to the water outlet end of the mixing and regulating tank, the water inlet end of the second demulsification reaction tank is connected to the water outlet end of the first demulsification reaction tank, and the water inlet end of the vertical flow sedimentation tank is connected to the water outlet end of the second demulsification reaction tank;

[0013] An electrocatalytic reaction unit, wherein a water inlet of the electrocatalytic reaction unit is connected to a water outlet of the vertical flow sedimentation tank;

[0014] A coagulation and sedimentation unit, wherein a water inlet of the coagulation and sedimentation unit is connected to a water outlet of the electrocatalytic reaction unit;

[0015] A biochemical reaction unit, wherein the water inlet of the biochemical reaction unit is connected to the water outlet of the coagulation and sedimentation unit;

[0016] A resin degreasing unit, wherein the water inlet of the resin degreasing unit is connected to the water outlet of the biochemical reaction unit, and the water outlet of the resin degreasing unit is connected to the discharge assembly.

[0017] In one embodiment, the electrocatalytic reaction unit includes a first electrocatalytic reaction tank, a second electrocatalytic reaction tank and an electrocatalytic water outlet tank, the water inlet end of the first electrocatalytic reaction tank is connected to the vertical flow sedimentation tank, the water inlet end of the second electrocatalytic reaction tank is connected to the water outlet end of the first electrocatalytic reaction tank, and the water outlet end of the second electrocatalytic reaction tank is connected to the water inlet end of the electrocatalytic water outlet tank.

[0018] In one embodiment, the coagulation sedimentation unit includes a coagulation reaction tank, which is provided with a coagulation reaction tank, a flocculation reaction tank, an inclined plate sedimentation tank and a coagulation outlet tank which are sequentially connected along the water flow direction, and the water inlet end of the coagulation reaction tank is connected to the water outlet end of the electrocatalytic water outlet tank.

[0019] In one embodiment, the biochemical reaction unit includes an anoxic tank, an aerobic tank, an MBR membrane tank and a biochemical effluent storage tank. The water inlet end of the anoxic tank is connected to the water outlet end of the coagulation effluent tank, the water inlet end of the aerobic tank is connected to the water outlet end of the anoxic tank, the water inlet end of the MBR membrane tank is connected to the water outlet end of the aerobic tank, and the water outlet end of the MBR membrane tank is respectively connected to the water inlet end of the anoxic tank, the water inlet end of the aerobic tank and the water inlet end of the biochemical effluent storage tank.

[0020] In one embodiment, the resin deoiling unit includes a deoiling resin tank and a deoiling resin water outlet tank, the water inlet end of the deoiling resin tank is connected to the water outlet end of the biochemical effluent storage tank, the water outlet end of the deoiling resin tank is connected to the water inlet end of the deoiling resin water outlet tank, and the water outlet end of the deoiling resin water outlet tank is respectively connected to the water inlet end of the discharge assembly and the mixing and regulating tank.

[0021] In one embodiment, the resin deoiling unit also includes an alkaline washing regeneration tank, an ethanol regeneration tank, a pure water rinsing tank and a regeneration waste liquid tank. The liquid outlet of the alkaline washing regeneration tank, the liquid outlet of the ethanol regeneration tank and the water outlet of the pure water rinsing tank are all connected to the water inlet of the deoiling resin tank, and the liquid inlet of the regeneration waste liquid tank is connected to the water outlet of the deoiling resin tank.

[0022] In one embodiment, the resin deoiling unit further comprises a sodium hydroxide dosing tank, and the liquid outlet of the sodium hydroxide dosing tank is connected to the liquid inlet of the deoiling resin water outlet tank.

[0023] In one embodiment, the demulsification reaction unit also includes a demulsification water outlet tank and a hydrochloric acid dosing tank, the water inlet end of the demulsification water outlet tank is connected to the water outlet end of the vertical flow sedimentation tank, the water outlet end of the demulsification water outlet tank is connected to the water inlet end of the first electrocatalytic reaction tank, and the liquid outlet end of the hydrochloric acid dosing tank is connected to the liquid inlet end of the first demulsification reaction tank.

[0024] In one embodiment, the electrocatalytic reaction unit further includes a hydrogen peroxide dosing tank, and a liquid outlet of the hydrogen peroxide dosing tank is connected to a liquid inlet of the second electrocatalytic reaction tank.

[0025] In one of the embodiments, the vertical flow sedimentation tank is provided with a central pipe and a sludge hopper, wherein the central pipe is provided at the top of the vertical flow sedimentation tank, and the sludge hopper is provided at the bottom of the vertical flow sedimentation tank.

[0026] Compared with the prior art, the present invention has at least the following advantages:

[0027] 1. After the homogenization operation in the mixing and regulating tank, the production wastewater is transported to the first demulsification reaction tank, and hydrochloric acid is added to the first demulsification reaction tank, that is, the hydrochloric acid penetrates into the protective layer of the emulsified water droplets and destroys the protective layer, and the pH of the wastewater is adjusted to between 3 and 4; the wastewater is then transported from the first demulsification reaction tank to the second demulsification reaction tank, and cationic polyacrylamide is added to the second demulsification reaction tank, so that the wastewater is transported from the second demulsification reaction tank to the vertical flow sedimentation tank for flocculation and sedimentation, so that most of the lipid organic pollutants, grease organic pollutants and emulsified organic pollutants in the wastewater can be effectively removed.

[0028] 2. The wastewater flowing out of the vertical flow sedimentation tank is transported to the electrocatalytic reaction unit, and the electrocatalytic reaction unit can oxidize the macromolecular organic matter in the wastewater into small molecular organic matter. The wastewater is then transported from the electrocatalytic reaction unit to the coagulation sedimentation unit for coagulation sedimentation reaction, so that the organic pollutants in the wastewater can be removed, thereby effectively reducing the COD value in the wastewater, and at the same time, the LAS value and SS value in the wastewater can also be reduced.

[0029] 3. The production wastewater is transported from the coagulation and sedimentation unit to the biochemical reaction unit, where the wastewater is subjected to nitrogen and phosphorus removal treatment, which can effectively remove inorganic pollutants in the wastewater. The wastewater is then transported from the biochemical reaction unit to the resin degreasing unit, where the residual dissolved oil in the wastewater is removed, which can effectively remove oily organic matter and inorganic pollutants in the wastewater, making the wastewater meet the discharge standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the structure of a grease organic wastewater treatment device in one embodiment;

[0032] Figure 2 for Figure 1 A schematic diagram of the partial structure of a demulsification reaction unit of a grease organic wastewater treatment device shown;

[0033] Figure 3 for Figure 1 A schematic diagram of the partial structure of the electrocatalytic reaction unit of the oil and fat organic wastewater treatment device shown;

[0034] Figure 4 for Figure 1A schematic diagram of the partial structure of a coagulation and sedimentation unit of a grease organic wastewater treatment device shown;

[0035] Figure 5 for Figure 1 A schematic diagram of the partial structure of the biochemical reaction unit of the oil and fat organic wastewater treatment device shown;

[0036] Figure 6 for Figure 1 A partial structural schematic diagram of a resin degreasing unit of a grease organic wastewater treatment device shown;

[0037] Figure numerals: Grease organic wastewater treatment device 10; mixing and regulating tank 100; demulsification reaction unit 200; first demulsification reaction tank 210; second demulsification reaction tank 220; vertical flow sedimentation tank 230; central pipe 2310; sludge hopper 2320; demulsification water outlet tank 240; hydrochloric acid dosing tank 250; electrocatalytic reaction unit 300; first electrocatalytic reaction tank 310; second electrocatalytic reaction tank 320; electrocatalytic water outlet tank 330; hydrogen peroxide dosing tank 340; coagulation and sedimentation unit 400; mixing Coagulation reaction tank 410; coagulation reaction tank 4101; flocculation reaction tank 4102; inclined plate sedimentation tank 4103; coagulation effluent tank 4104; biochemical reaction unit 500; anoxic tank 510; aerobic tank 520; MBR membrane tank 530; biochemical effluent storage tank 540; resin deoiling unit 600; deoiling resin tank 610; deoiling resin effluent tank 620; alkali washing regeneration tank 630; ethanol regeneration tank 640; pure water washing tank 650; regeneration waste liquid tank 660; sodium hydroxide dosing tank 670. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] See also Figures 1 to 6 In order to better understand the grease organic wastewater treatment device 10 disclosed in the present invention, the grease organic wastewater treatment device 10 is further explained below:

[0042] An oil and fat organic wastewater treatment device 10 of one embodiment includes a mixing and regulating tank 100, a demulsification reaction unit 200, an electrocatalytic reaction unit 300, a coagulation and sedimentation unit 400, a biochemical reaction unit 500 and a resin deoiling unit 600. The water inlet end of the mixing and regulating tank 100 is connected to the production wastewater discharge component. The demulsification reaction unit 200 includes a first demulsification reaction tank 210, a second demulsification reaction tank 220 and a vertical flow sedimentation tank 230, the water inlet end of the first demulsification reaction tank 210 is connected to the water outlet end of the mixing and regulating tank 100, the water inlet end of the second demulsification reaction tank 220 is connected to the water outlet end of the first demulsification reaction tank 210, and the water inlet end of the vertical flow sedimentation tank 230 is connected to the water outlet end of the second demulsification reaction tank 220. The water inlet end of the electrocatalytic reaction unit 300 is connected to the water outlet end of the vertical flow sedimentation tank 230. The water inlet of the coagulation and sedimentation unit 400 is connected to the water outlet of the electrocatalytic reaction unit 300. The water inlet of the biochemical reaction unit 500 is connected to the water outlet of the coagulation and sedimentation unit 400. The water inlet of the resin deoiling unit 600 is connected to the water outlet of the biochemical reaction unit 500, and the water outlet of the resin deoiling unit 600 is connected to the discharge assembly.

[0043] In this embodiment, the production wastewater is transported to the first demulsification reaction tank 210 after the homogenization operation of the mixing and regulating tank 100, and hydrochloric acid is added to the first demulsification reaction tank 210, that is, the hydrochloric acid penetrates into the protective layer of the emulsified water droplets and destroys the protective layer, and the pH of the wastewater is adjusted to between 3 and 4; the wastewater is then transported from the first demulsification reaction tank 210 to the second demulsification reaction tank 220, and cationic polyacrylamide is added to the second demulsification reaction tank 220, so that the wastewater is transported from the second demulsification reaction tank 220 to the vertical flow sedimentation tank 230 for flocculation and sedimentation, so that most of the lipid organic pollutants, oily organic pollutants and emulsified organic pollutants in the wastewater can be effectively removed.

[0044] Furthermore, the wastewater flowing out of the vertical flow sedimentation tank 230 is transported to the electrocatalytic reaction unit 300, and the electrocatalytic reaction unit 300 can oxidize the macromolecular organic matter in the wastewater into small molecular organic matter. The wastewater is then transported by the electrocatalytic reaction unit 300 to the coagulation sedimentation unit 400 for coagulation sedimentation reaction, so that the organic pollutants in the wastewater can be removed, thereby effectively reducing the COD value in the wastewater, and at the same time, the LAS value and SS value in the wastewater can also be reduced.

[0045] Furthermore, the production wastewater is transported from the coagulation and sedimentation unit 400 to the biochemical reaction unit 500, and the wastewater is subjected to nitrogen and phosphorus removal treatment by the biochemical reaction unit 500, so that inorganic pollutants in the wastewater can be effectively removed. The wastewater is then transported from the biochemical reaction unit 500 to the resin degreasing unit 600, and the resin degreasing unit 600 removes the residual dissolved oil in the wastewater, so that the oily organic matter and inorganic pollutants in the wastewater can be effectively removed, so that the wastewater meets the discharge standards.

[0046] It should be noted that hydrochloric acid, as a demulsifier, is distributed in the oil phase in a molecular state and moves and diffuses on the surface layer of the emulsified water droplets, so that it can penetrate into the protective layer of the emulsified water droplets and destroy the protective layer, which is a demulsification reaction. At the same time, hydrochloric acid can also adjust the pH value of the wastewater to between 3 and 4, so that the wastewater can flocculate and precipitate when the cationic polyacrylamide is added to the second demulsification reaction tank 220, and then the precipitate is removed by the vertical flow sedimentation tank 230, so that most of the lipid organic pollutants, grease organic pollutants and emulsified organic pollutants in the wastewater can be effectively removed.

[0047] It should be additionally explained that both the first demulsification reaction tank 210 and the second demulsification reaction tank 220 are provided with a stirring element.

[0048] like Figures 1 to 3As shown, in one embodiment, the electrocatalytic reaction unit 300 includes a first electrocatalytic reaction tank 310, a second electrocatalytic reaction tank 320 and an electrocatalytic water outlet tank 330, the water inlet end of the first electrocatalytic reaction tank 310 is connected to the vertical flow sedimentation tank 230, the water inlet end of the second electrocatalytic reaction tank 320 is connected to the water outlet end of the first electrocatalytic reaction tank 310, and the water outlet end of the second electrocatalytic reaction tank 320 is connected to the water inlet end of the electrocatalytic water outlet tank 330. It should be noted that the wastewater flows out of the vertical flow sedimentation plate and is transported to the first electrocatalytic reaction tank 310, and the titanium-based coating electrode plate in the first electrocatalytic reaction tank 310 generates current, that is, hydrogen peroxide free radicals HO2- are generated by current electrolysis, so that secondary reactions occur in the wastewater, thereby degrading or decomposing organic pollution into CO2 or other small molecular compounds. The wastewater treated by the first electrocatalytic reaction tank 310 is transported to the second electrocatalytic reaction tank 320, a hydrogen peroxide solution is added to the second electrocatalytic reaction tank 320, and Fe is generated by electrolysis of the electrode plates in the second electrocatalytic reaction tank 320. 2+ The added H2O2 and the reaction produce highly oxidizing ·OH, which causes the organic matter in the wastewater to undergo rapid oxidation reaction and free radical chain reaction, thus decomposing large molecular organic matter into small molecular organic matter, thereby reducing the COD value of the wastewater.

[0049] like Figure 1 , Figure 3 and Figure 4 As shown, in one embodiment, the coagulation sedimentation unit 400 includes a coagulation reaction tank 410, and the coagulation reaction tank 410 is arranged along the water flow direction (such as Figure 4 The X) is provided with a coagulation reaction tank 4101, a flocculation reaction tank 4102, an inclined plate sedimentation tank 4103 and a coagulation outlet tank 4104 which are connected in sequence. The water inlet end of the coagulation reaction tank 4101 is connected with the water outlet end of the electrocatalytic outlet tank 330. It should be noted that the wastewater treated by the electrocatalytic reaction unit 300 is transported to the coagulation reaction tank 4101 by the electrocatalytic outlet tank 330. At this time, the wastewater treated by the electrocatalytic treatment is acidic. Sodium hydroxide solution is added to the coagulation reaction tank 4101 to adjust the pH value of the wastewater between 8 and 9 to produce a large amount of Fe 3+Sedimentation. The wastewater then overflows from the bottom of the coagulation reaction tank 4101 to the flocculation reaction tank 4102, anionic PAM is added to the flocculation reaction tank 4102 to form a mud-water mixture, and the mud-water mixture overflows from the top of the flocculation reaction tank 4102 to the inclined plate sedimentation tank 4103. At this time, the sludge forms sediments under the action of gravity and the inclined plate and is discharged from the bottom of the inclined plate sedimentation tank 4103 to the filter press assembly for subsequent treatment. The wastewater overflows from the upper end of the inclined plate sedimentation tank 4103 to the coagulation outlet tank 4104, which can effectively remove most of the organic pollutants in the wastewater and further reduce the COD value of the wastewater.

[0050] It should be additionally explained that stirring components are provided in the coagulation reaction tank 4101 , the flocculation reaction tank 4102 and the coagulation outlet tank 4104 .

[0051] like Figure 1 , Figure 4 and Figure 5 As shown, in one embodiment, the biochemical reaction unit 500 includes an anoxic tank 510, an aerobic tank 520, an MBR membrane tank 530 and a biochemical effluent storage tank 540, the water inlet end of the anoxic tank 510 is connected to the water outlet end of the coagulation effluent tank 4104, the water inlet end of the aerobic tank 520 is connected to the water outlet end of the anoxic tank 510, the water inlet end of the MBR membrane tank 530 is connected to the water outlet end of the aerobic tank 520, and the water outlet end of the MBR membrane tank 530 is respectively connected to the water inlet end of the anoxic tank 510, the water inlet end of the aerobic tank 520 and the water inlet end of the biochemical effluent storage tank 540. It should be noted that the wastewater is transported from the coagulation outlet tank 4104 to the anoxic tank 510, and the DO in the anoxic tank 510 is ≤0.2mg / L. In the anoxic tank 510, heterotrophic bacteria hydrolyze the soluble organic matter in the wastewater into organic acids, decompose macromolecular organic matter into small molecular organic matter, and convert insoluble organic matter into soluble organic matter. The wastewater treated in the anoxic tank 510 is transported to the aerobic tank 520, and the DO in the aerobic tank 520 is between 2mg / L-5mg / L. Under aerobic conditions, the organic matter in the wastewater will be oxidized by aerobic bacteria into carbon dioxide and water, and a large amount of energy will be released. The wastewater is then transported from the aerobic tank 520 to the MBR membrane tank 530, and most of the suspended matter in the wastewater can be removed by the MBR membrane tank 530, thereby effectively reducing the SS value of the wastewater. Furthermore, the wastewater treated by the MBR membrane tank 530 is returned to the aerobic tank 520 and the anoxic tank 510 for treatment. The organic nitrogen in the wastewater is converted into nitrate nitrogen by the nitrification of the aerobic tank 520, and then converted into nitrogen gas by the denitrification of the anoxic tank 510. At the same time, the phosphorus released in the wastewater is absorbed by the activated sludge when passing through the aerobic tank 520, thereby achieving the effect of nitrogen removal and phosphorus removal.

[0052] It should be noted that the anoxic tank 510 is in the front, and the organic carbon in the wastewater is used by denitrifying bacteria, which can reduce the organic load of the subsequent aerobic tank 520. The alkalinity generated by the denitrification reaction can compensate for the alkalinity requirement of the nitrification reaction in the aerobic tank 520. At the same time, a chemical cleaning device is provided on the MBR membrane to clean and maintain the MBR membrane.

[0053] like Figure 1 , Figure 5 and Figure 6 As shown, in one embodiment, the resin deoiling unit 600 includes a deoiling resin tank 610 and a deoiling resin water outlet tank 620, the water inlet end of the deoiling resin tank 610 is connected to the water outlet end of the biochemical effluent storage tank 540, the water outlet end of the deoiling resin tank 610 is connected to the water inlet end of the deoiling resin water outlet tank 620, and the water outlet end of the deoiling resin water outlet tank 620 is respectively connected to the discharge assembly and the water inlet end of the mixing and regulating tank 100. It should be noted that the wastewater treated by the biochemical reaction unit 500 is transported from the biochemical effluent storage tank 540 to the deoiling resin tank 610 for deoiling, so that the residual dissolved oil in the wastewater can be removed, reducing the COD value content of the wastewater. At the same time, a bag filter is provided at the front end of the deoiling resin tank 610 to ensure that there is no suspended matter in the incoming water. Furthermore, the wastewater passing through the degreasing resin outlet tank 620 that meets the discharge standard is directly discharged through the discharge component, otherwise it is transported to the mixing and regulating tank 100 for circulation treatment.

[0054] It should be noted that the wastewater discharge standard needs to meet the third-level discharge standard of "Comprehensive Sewage Discharge Standard" GB8978-1996.

[0055] like Figure 6 As shown, in one embodiment, the resin deoiling unit 600 further includes an alkali washing regeneration tank 630, an ethanol regeneration tank 640, a pure water rinsing tank 650 and a regeneration waste liquid tank 660. The liquid outlet of the alkali washing regeneration tank 630, the liquid outlet of the ethanol regeneration tank 640 and the water outlet of the pure water rinsing tank 650 are all connected to the water inlet of the deoiling resin tank 610, and the liquid inlet of the regeneration waste liquid tank 660 is connected to the water outlet of the deoiling resin tank 610. It should be noted that when the oil content of the outlet water of the deoiling resin water outlet tank 620 is ≥20 mg / L, the deoiling resin tank 610 is subjected to an acid-base regeneration step through the alkali washing regeneration tank 630, the ethanol regeneration tank 640 and the first pure water rinsing tank 650, and the regeneration waste liquid is discharged to the regeneration waste liquid tank 660 for unified treatment. Furthermore, in other embodiments, the regeneration waste liquid tank 660 is connected to the mixing and adjusting tank 100, and the regeneration waste liquid is discharged into the mixing and adjusting tank 100 for wastewater treatment.

[0056] like Figure 6As shown, in one embodiment, the resin degreasing unit 600 further includes a sodium hydroxide dosing tank 670, and the liquid outlet of the sodium hydroxide dosing tank 670 is connected to the liquid inlet of the degreasing resin water outlet tank 620. It should be noted that by providing the sodium hydroxide dosing tank 670, the pH value of the water outlet is prevented from being too low, so as to automatically adjust the pH value of the water outlet.

[0057] like Figure 2 As shown, in one embodiment, the demulsification reaction unit 200 further includes a demulsification water outlet tank 240 and a hydrochloric acid dosing tank 250, the water inlet end of the demulsification water outlet tank 240 is connected to the water outlet end of the vertical flow sedimentation tank 230, the water outlet end of the demulsification water outlet tank 240 is connected to the water inlet end of the first electrocatalytic reaction tank 310, and the liquid outlet end of the hydrochloric acid dosing tank 250 is connected to the liquid inlet end of the first demulsification reaction tank 210. It should be noted that the hydrochloric acid dosing tank 250 is provided to facilitate the automatic dosing of the first demulsification reaction tank 210.

[0058] like Figure 3 As shown, in one embodiment, the electrocatalytic reaction unit 300 further includes a hydrogen peroxide dosing tank 340, and the liquid outlet of the hydrogen peroxide dosing tank 340 is connected to the liquid inlet of the second electrocatalytic reaction tank 320. It should be noted that the hydrogen peroxide dosing tank 340 is provided to facilitate automatic dosing of the second electrocatalytic reaction tank 320.

[0059] like Figure 2 As shown, in one embodiment, the vertical flow sedimentation tank 230 is provided with a central pipe 2310 and a sludge hopper 2320, wherein the central pipe 2310 is arranged at the top of the vertical flow sedimentation tank 230, and the sludge hopper 2320 is arranged at the bottom of the vertical flow sedimentation tank 230. It should be noted that the wastewater is transported from the second demulsification reaction tank 220 to the vertical flow sedimentation tank 230, and enters the vertical flow sedimentation tank 230 through the central pipe 2310, and the wastewater undergoes sedimentation reaction in the vertical flow sedimentation tank 230, and the sludge is deposited in the sludge hopper 2320, and the wastewater is transported from the upper end of the vertical flow sedimentation tank 230 to the demulsification and water removal tank.

[0060] See also Figures 1 to 6 In one embodiment, the operation process of the oil and fat organic wastewater treatment device 10 is as follows:

[0061] 1. The wastewater first enters the mixing and adjusting tank 100 for homogenous mixing; the main pollutants in the wastewater are COD≤10000mg / L, pH≥9, BOD5≤2000mg / L, SS≤1000mg / L, total phosphorus≤100mg / L, LAS≤50mg / L, NH3-N≤300mg / L, and oil content≤200mg / L.

[0062] 2. The wastewater enters the first demulsification reaction tank 210 through the outlet pump of the mixing and regulating tank 100, and hydrochloric acid with a mass concentration of 5-10% is added to the inlet end of the first demulsification reaction tank 210 through the hydrochloric acid dosing tank 250 to control the pH of the first demulsification reaction tank 210 between 3 and 4; the bottom of the first demulsification reaction tank 210 is connected to the second demulsification reaction tank 220, and cationic polyacrylamide with a mass concentration of 0.1-0.3% is added to the second demulsification reaction tank 220, and the addition amount is 1-1.1 times the theoretical addition amount, and the addition amount is 5-10 mg / L; the wastewater is discharged from the second demulsification reaction tank 210 by the outlet pump of the mixing and regulating tank 100, and the hydrochloric acid dosing tank 250 is added to the inlet end of the first demulsification reaction tank 210, and the pH of the first demulsification reaction tank 210 is controlled between 3 and 4; the bottom of the first demulsification reaction tank 210 is connected to the second demulsification reaction tank 220, and cationic polyacrylamide with a mass concentration of 0.1-0.3% is added to the second demulsification reaction tank 220, and the addition amount is 1-1.1 times the theoretical addition amount, and the addition amount is 5-10 mg / L; The demulsification reaction tank 220 enters the vertical flow sedimentation tank 230 through the central pipe 2310. The water flow velocity in the central pipe 2310 is 0.01m / s, the rising velocity of the water flow in the sedimentation area is 0.5mm / s, the sedimentation time is 1-1.5s, and the inclination angle of the sludge hopper 2320 is 60°; after the demulsification reaction unit 200, most of the oil and fat organic pollutants in the wastewater can be removed, and part of the LAS can be removed at the same time; the effluent COD of the demulsification reaction unit 200 is ≤5000mg / L, LAS ≤40mg / L, SS ≤400mg / L, and the oil content is ≤150mg / L;

[0063] 3. Wastewater overflows from the vertical flow sedimentation tank 230 to the demulsification water outlet tank 240, and is pumped to the first electrocatalytic reaction tank 310 through a lifting pump. A titanium-based coated electrode plate is placed inside the reaction tank, and hydrogen peroxide free radicals HO2- are generated by current electrolysis, causing secondary reactions in the wastewater, thereby degrading or decomposing pollutants into CO2, or converting them into other simple compounds; the first electrocatalytic reaction tank 310 controls the voltage to 180V, and the reaction time is 1h;

[0064] 4. The wastewater overflows from the upper part to the second electrocatalytic reaction tank 320. The wastewater is consumed by the electrode plate in the second electrocatalytic reaction tank 320 to electrolyze Fe2+. A hydrogen peroxide solution with a concentration of 5 to 10% is added to the second electrocatalytic reaction tank 320 through the hydrogen peroxide dosing tank 340. The dosage is 1 to 1.2 times the theoretical dosage, and the dosage is 100 to 150 mg / L. In the second electrocatalytic reaction tank 320, the electrolytic electrode plate is used to generate new ecological H2O2 and Fe 2+ At the same time, the reaction produces strong oxidizing ·OH. The organic matter in the reaction system undergoes rapid oxidation reaction and free radical chain reaction under the action of ·OH, so that COD in the wastewater is removed. The electrochemical generation of H2O2 is generated by the reduction of oxygen under the conditions of cathode oxygenation or aeration. The electrocatalytic unit oxidation can decompose large molecular organic matter into small molecular organic matter and carbonize some organic matter to achieve the effect of removing COD; COD of the electrocatalytic unit effluent is ≤4000mg / L, LAS ≤10mg / L, SS ≤600mg / L;

[0065] 5. The effluent of the second electrocatalytic reaction tank 320 overflows from the bottom to the electrocatalytic effluent tank 330, and is pumped to the coagulation reaction tank 410 through a lifting pump. A 30% sodium hydroxide solution is added to the coagulation reaction tank 4101, and the pH of the coagulation reaction tank 4101 is adjusted to between 8 and 9. The coagulation reaction tank 4101 is equipped with a vertical mixer to fully stir the materials. The reaction time of this process is 10 to 30 minutes.

[0066] 6. Wastewater overflows from the bottom of the coagulation reaction tank 4101 to the flocculation reaction tank 4102. Anionic PAM is added with a concentration of 0.1% to 0.3%, an addition amount of 5 to 10 mg / L, and a reaction time of 30 to 60 min. The flocculation reaction tank 4102 is equipped with a vertical mixer to stir the materials at a uniform speed. The mud-water mixture overflows to the inclined plate sedimentation tank 4103. The sludge forms sediments under the action of gravity and the inclined plate. The effluent overflows from the upper end of the inclined plate sedimentation tank 4103 to the coagulation outlet tank 4104. The sludge is discharged from the bottom of the inclined plate sedimentation tank. The role of coagulation is to remove SS and iron ions produced by electrocatalysis in the water, remove organic matter in the water by discharging sludge, and reduce the COD of the wastewater.

[0067] 7. Water indicators of coagulation outlet tank 4104: SS≤100mg / L, COD≤2000mg / L, LAS≤5mg / L, SS≤100mg / L, NH3-N≤300mg / L, oil content≤50mg / L, total phosphorus≤80mg / L;

[0068] 8. The wastewater is transported to the anoxic tank 510 by a lifting pump in the coagulation outlet tank 4104. A submersible agitator is provided at the bottom of the anoxic tank 510. The DO in the tank is ≤0.2mg / L. In the anoxic section, heterotrophic bacteria hydrolyze the soluble organic matter in the wastewater into organic acids, decompose macromolecular organic matter into small molecular organic matter, and convert insoluble organic matter into soluble organic matter.

[0069] 9. Wastewater overflows from the top overflow port to the aerobic tank 520. The aerobic tank 520 controls DO=2mg / L-5mg / L and MLSS=6000mg / L. Under aerobic conditions, organic matter in the wastewater will be oxidized into carbon dioxide and water by aerobic bacteria, and a large amount of energy will be released;

[0070] 10. Wastewater overflows from the top of the aerobic tank 520 to the MBR membrane tank 530. The membrane tank is equipped with an MBR membrane and an aeration pipe. Most of the SS in the water can be removed through the MBR membrane. The membrane tank controls MLSS ≤ 7000-8000 mg / L, DO = 2 mg / L-5 mg / L, the MBR membrane operating pressure ≤ 0.01 Mpa and is equipped with a chemical cleaning device;

[0071] 11. The anoxic tank 510, the aerobic tank 520 and the MBR membrane tank 530 form an AO system. The organic nitrogen in the wastewater is converted into nitrate nitrogen by nitrification in the aerobic tank 520, and then converted into nitrogen gas by denitrification in the anoxic tank 510. At the same time, the phosphorus released in the wastewater is absorbed and discharged by the activated sludge through the aerobic tank 520, thereby achieving the effect of phosphorus removal;

[0072] 12. Wastewater is pumped to the biochemical effluent storage tank 540 through the MBR membrane effluent pump, and the effluent indicators are: COD≤400mg / L, total phosphorus≤5mg / L, NH3-N≤30mg / L, SS≤80mg / L;

[0073] 13. The biochemical effluent storage tank 540 is equipped with a lifting pump to transport the wastewater to the degreasing resin tank 610. The resin is H+ type, the operating flow rate is 5BV, and the top-in and bottom-out method is adopted. A bag filter is provided at the front end of the resin tank to ensure that there is no suspended matter in the influent; at the same time, the resin system is equipped with an alkali washing regeneration tank 630, an ethanol regeneration tank 640, a regeneration waste liquid tank 660, and a pure water washing tank 650; the effluent enters the degreasing resin effluent tank 620, and when the effluent oil content is ≥20mg / L, an acid-base regeneration step is performed, and the regeneration waste liquid is sent to the mixing adjustment tank 100 for treatment;

[0074] 14. Resin indicators in the degreasing resin outlet tank 620: COD≤400mg / L, total phosphorus≤5mg / L, NH3-N≤30mg / L, SS≤80mg / L, LAS≤5mg / L, oil content≤5mg / L, BOD5≤200mg / L;

[0075] 15. The effluent meets the third level standard of "Comprehensive Sewage Discharge Standard GB8978-1996". Qualified wastewater can be discharged or reused, and unqualified wastewater enters the mixing and adjusting tank 100 for re-treatment.

[0076] Compared with the prior art, the present invention has at least the following advantages:

[0077] 1. After the homogenization operation in the mixing and regulating tank, the production wastewater is transported to the first demulsification reaction tank, and hydrochloric acid is added to the first demulsification reaction tank, that is, the hydrochloric acid penetrates into the protective layer of the emulsified water droplets and destroys the protective layer, and the pH of the wastewater is adjusted to between 3 and 4; the wastewater is then transported from the first demulsification reaction tank to the second demulsification reaction tank, and cationic polyacrylamide is added to the second demulsification reaction tank, so that the wastewater is transported from the second demulsification reaction tank to the vertical flow sedimentation tank for flocculation and sedimentation, so that most of the lipid organic pollutants, grease organic pollutants and emulsified organic pollutants in the wastewater can be effectively removed.

[0078] 2. The wastewater flowing out of the vertical flow sedimentation tank is transported to the electrocatalytic reaction unit, and the electrocatalytic reaction unit can oxidize the macromolecular organic matter in the wastewater into small molecular organic matter. The wastewater is then transported from the electrocatalytic reaction unit to the coagulation sedimentation unit for coagulation sedimentation reaction, so that the organic pollutants in the wastewater can be removed, thereby effectively reducing the COD value in the wastewater, and at the same time, the LAS value and SS value in the wastewater can also be reduced.

[0079] 3. The production wastewater is transported from the coagulation and sedimentation unit to the biochemical reaction unit, where the wastewater is subjected to nitrogen and phosphorus removal treatment, which can effectively remove inorganic pollutants in the wastewater. The wastewater is then transported from the biochemical reaction unit to the resin degreasing unit, where the residual dissolved oil in the wastewater is removed, which can effectively remove oily organic matter and inorganic pollutants in the wastewater, making the wastewater meet the discharge standards.

[0080] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A grease organic wastewater treatment device (10), characterized in that: include: A mixing and adjusting tank (100), wherein the water inlet end of the mixing and adjusting tank (100) is connected to the production wastewater discharge component; A demulsification reaction unit (200), the demulsification reaction unit (200) comprising a first demulsification reaction tank (210), a second demulsification reaction tank (220) and a vertical flow sedimentation tank (230), the water inlet end of the first demulsification reaction tank (210) being connected to the water outlet end of the mixing and regulating tank (100), the water inlet end of the second demulsification reaction tank (220) being connected to the water outlet end of the first demulsification reaction tank (210), and the water inlet end of the vertical flow sedimentation tank (230) being connected to the water outlet end of the second demulsification reaction tank (220); An electrocatalytic reaction unit (300), wherein a water inlet end of the electrocatalytic reaction unit (300) is connected to a water outlet end of the vertical flow sedimentation tank (230); A coagulation and sedimentation unit (400), wherein a water inlet of the coagulation and sedimentation unit (400) is connected to a water outlet of the electrocatalytic reaction unit (300); A biochemical reaction unit (500), wherein a water inlet of the biochemical reaction unit (500) is connected to a water outlet of the coagulation and sedimentation unit (400); A resin deoiling unit (600), wherein the water inlet end of the resin deoiling unit (600) is in communication with the water outlet end of the biochemical reaction unit (500), and the water outlet end of the resin deoiling unit (600) is in communication with a discharge assembly.

2. The grease organic wastewater treatment device (10) according to claim 1, characterized in that: The electrocatalytic reaction unit (300) comprises a first electrocatalytic reaction tank (310), a second electrocatalytic reaction tank (320) and an electrocatalytic water outlet tank (330), wherein the water inlet end of the first electrocatalytic reaction tank (310) is connected to the vertical flow sedimentation tank (230), the water inlet end of the second electrocatalytic reaction tank (320) is connected to the water outlet end of the first electrocatalytic reaction tank (310), and the water outlet end of the second electrocatalytic reaction tank (320) is connected to the water inlet end of the electrocatalytic water outlet tank (330).

3. The grease organic wastewater treatment device (10) according to claim 2, characterized in that: The coagulation sedimentation unit (400) comprises a coagulation reaction tank (410), wherein the coagulation reaction tank (410) is provided with a coagulation reaction tank (4101), a flocculation reaction tank (4102), an inclined plate sedimentation tank (4103) and a coagulation water outlet tank (4104) which are sequentially connected along the water flow direction, and the water inlet end of the coagulation reaction tank (4101) is connected to the water outlet end of the electrocatalytic water outlet tank (330).

4. The grease organic wastewater treatment device (10) according to claim 3, characterized in that: The biochemical reaction unit (500) comprises an anoxic tank (510), an aerobic tank (520), an MBR membrane tank (530) and a biochemical effluent storage tank (540); the water inlet end of the anoxic tank (510) is connected to the water outlet end of the coagulation effluent tank (4104); the water inlet end of the aerobic tank (520) is connected to the water outlet end of the anoxic tank (510); the water inlet end of the MBR membrane tank (530) is connected to the water outlet end of the aerobic tank (520); and the water outlet end of the MBR membrane tank (530) is respectively connected to the water inlet end of the anoxic tank (510), the water inlet end of the aerobic tank (520) and the water inlet end of the biochemical effluent storage tank (540).

5. The grease organic wastewater treatment device (10) according to claim 4, characterized in that: The resin deoiling unit (600) comprises a deoiling resin tank (610) and a deoiling resin water outlet tank (620); the water inlet of the deoiling resin tank (610) is connected to the water outlet of the biochemical water storage tank (540); the water outlet of the deoiling resin tank (610) is connected to the water inlet of the deoiling resin water outlet tank (620); the water outlet of the deoiling resin water outlet tank (620) is respectively connected to the water inlet of the discharge assembly and the mixing and regulating tank (100).

6. The grease organic wastewater treatment device (10) according to claim 5, characterized in that: The resin deoiling unit (600) further comprises an alkaline washing regeneration tank (630), an ethanol regeneration tank (640), a pure water rinsing tank (650) and a regeneration waste liquid tank (660), wherein the liquid outlet of the alkaline washing regeneration tank (630), the liquid outlet of the ethanol regeneration tank (640) and the water outlet of the pure water rinsing tank (650) are all connected to the water inlet of the deoiling resin tank (610), and the liquid inlet of the regeneration waste liquid tank (660) is connected to the water outlet of the deoiling resin tank (610).

7. The grease organic wastewater treatment device (10) according to claim 6, characterized in that: The resin deoiling unit (600) further comprises a sodium hydroxide dosing tank (670), the liquid outlet of the sodium hydroxide dosing tank (670) being in communication with the liquid inlet of the deoiling resin water outlet tank (620).

8. The grease organic wastewater treatment device (10) according to claim 2, characterized in that: The demulsification reaction unit (200) further comprises a demulsification water outlet tank (240) and a hydrochloric acid dosing tank (250), wherein the water inlet end of the demulsification water outlet tank (240) is connected to the water outlet end of the vertical flow sedimentation tank (230), the water outlet end of the demulsification water outlet tank (240) is connected to the water inlet end of the first electrocatalytic reaction tank (310), and the liquid outlet end of the hydrochloric acid dosing tank (250) is connected to the liquid inlet end of the first demulsification reaction tank (210).

9. The grease organic wastewater treatment device (10) according to claim 2, characterized in that: The electrocatalytic reaction unit (300) further comprises a hydrogen peroxide dosing tank (340), wherein a liquid outlet of the hydrogen peroxide dosing tank (340) is connected to a liquid inlet of the second electrocatalytic reaction tank (320).

10. The grease organic wastewater treatment device (10) according to claim 1, characterized in that: The vertical flow sedimentation tank (230) is provided with a central pipe (2310) and a sludge hopper (2320), wherein the central pipe (2310) is provided at the top of the vertical flow sedimentation tank (230), and the sludge hopper (2320) is provided at the bottom of the vertical flow sedimentation tank (230).

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