An oil separation pretreatment equipment for kitchen waste water with stirring and hot water cleaning

Abstract

The present invention discloses an oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning. The device includes an oil removal tank (1), a siphon system (2) and a washing system (3). Among them, the kitchen waste water is subjected to oil-water separation in the oil removal tank, and the separated waste oil is discharged by the siphon system (2), and the drained water after separation treatment enters the washing system (3) to wash the oil removal tank. The oil separation pretreatment device for kitchen waste water disclosed by the present invention is provided with a siphon system, which can quickly and efficiently suck and discharge the separated waste water, improving the oil removal efficiency. The washing system is controlled by a PLC automatic control system to periodically flush the oil removal tank, which can timely remove the grease and dirt deposited on the inner wall of the tank, avoid siltation and blockage, and ensure the oil removal effect.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, specifically to the field of kitchen waste water treatment, and particularly to an oil separation pretreatment device and method for kitchen waste water with stirring and hot water cleaning. Background Art

[0002] The kitchen sewage in the catering service industry contains a large amount of oil and lipid substances. If not effectively removed, it will adhere to the outer walls of pipelines and inspection wells, forming oil scale that is difficult to remove, resulting in poor drainage of pipelines. Especially in winter, the grease cools and solidifies at low temperatures, easily causing serious siltation and pipeline sanitation problems.

[0003] In addition, after the grease enters the sewage treatment plant, in the subsequent secondary biochemical treatment stage, it will adhere to the surface of microorganisms, causing difficulty in breathing for the microorganisms, a decline in the ability to degrade pollutants, and in severe cases, a large number of microorganisms will die. Therefore, for the kitchen waste water with a high oil content in restaurants, hotels, canteens, etc., oil substances must be removed in the pretreatment stage before being discharged into the municipal pipe network.

[0004] Currently, the commonly used methods for removing floating oil and dispersed oil mainly include gravity oil removal method and coalescence oil removal method. Among them, the commonly used processes in the gravity oil removal method include oil removal tanks, horizontal flow oil separation tanks, and inclined plate oil separation tanks. Among them, the oil removal tank has high oil removal efficiency, but requires pressure inlet water, has high operating costs, and has complex internal equipment; the horizontal flow and inclined plate oil separation tanks have simple structures, but poor oil removal effects and large floor areas. Moreover, the commonly used oil separation tanks in the prior art do not have effective oil discharge, sludge discharge, and cleaning measures. After operating for a period of time, with the accumulation of grease and sedimentation of sludge, small particle dirt and fermented substances will precipitate at the bottom and side walls of the oil separation equipment, resulting in serious siltation and blockage, making some devices insensitive and affecting the oil removal effect.

[0005] Therefore, there is an urgent need to provide a kitchen waste water pretreatment device with a simple structure, high oil removal efficiency, capable of recovering grease, and capable of automatic flushing. Summary of the Invention

[0006] In order to overcome the above problems, the inventor of the present invention conducted intensive research and designed an oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning. Through the tangential water inlet system and siphon system provided, the device can utilize the density difference of oil, water, and sludge to stratify them, and then discharge the oil layer through the siphon system, improving the oil removal efficiency; at the same time, through the washing system, heating the washing water and cooperating with detergents, it can quickly and efficiently clean the dirt on the inner wall of the oil removal tank, ensuring the normal operation of the equipment, thus completing the present invention.

[0007] Specifically, the object of the present invention is to provide the following aspects:

[0008] In a first aspect, an oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning is provided. The device includes an oil removal tank 1, a siphon system 2 and a washing system 3. Among them,

[0009] The kitchen waste water is separated from oil and water in the oil removal tank. The separated waste oil is discharged by the siphon system 2, and the drained water after separation treatment enters the washing system 3 to wash the oil removal tank.

[0010] In a second aspect, a pretreatment method for kitchen waste water is provided. Preferably, the oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning described in the first aspect is used. Among them, the method includes the following steps:

[0011] Step I: Feed the kitchen waste water to be treated into the oil removal tank through the water inlet pipe;

[0012] Step II: After the waste water in the oil removal tank is stratified, turn on the vacuum tank and the siphon valve to vacuum-siphon the waste oil layer;

[0013] Step III: After the device operates for a period of time, turn on the washing system to perform hot water washing.

[0014] The beneficial effects of the present invention include:

[0015] (1) The oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning provided by the present invention has a simple structure, is easy to maintain, has a long service life, and strong versatility;

[0016] (2) The oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning provided by the present invention increases the waste water residence time and improves the oil-water separation efficiency by setting a tangential water inlet pipe;

[0017] (3) The oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning provided by the present invention is provided with a siphon system, which can quickly and efficiently suck and discharge the waste oil separated from the waste water, improving the oil removal efficiency;

[0018] (4) The oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning provided by the present invention uses the washing system to periodically flush the oil removal tank, which can timely remove the grease and dirt deposited on the inner wall of the tank, avoid siltation and blockage, and ensure the oil removal effect;

[0019] (5) The oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning provided by the present invention adds a detergent to the washing system, improving the dirt removal efficiency. Description of the Drawings

[0020] Figure 1 Shows the overall structural schematic diagram of an oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning according to a preferred embodiment of the present invention;

[0021] Figure 2 Schematic diagram showing the connection relationship between the water inlet pipe and the oil removal tank in a preferred embodiment of the present invention;

[0022] Figure 3 Schematic diagram showing the connection relationship between the floating disc and the oil removal tank in a preferred embodiment of the present invention;

[0023] Figure 4 Schematic diagram showing the structure of the oil suction pipe in a preferred embodiment of the present invention;

[0024] Figure 5 Schematic diagram showing the internal component structure of the control box in a preferred embodiment of the present invention;

[0025] Figure 6 Schematic diagram showing the structure of the washing component in a preferred embodiment of the present invention.

[0026] Explanation of the reference numerals in the drawings:

[0027] 1 - Oil removal tank;

[0028] 11 - Water inlet pipe;

[0029] 12 - Stirring device;

[0030] 13 - Drain pipe;

[0031] 131 - Three - way valve;

[0032] 14 - Sewage pipe;

[0033] 15 - Slide groove;

[0034] 2 - Siphon system;

[0035] 21 - Floating disc;

[0036] 211 - Central disc;

[0037] 212 - Wing plate;

[0038] 213 - Roller;

[0039] 22 - Oil suction pipe;

[0040] 221 - First pipe body;

[0041] 222 - Second pipe body;

[0042] 223 - Telescopic pipe;

[0043] 224 - Guide post;

[0044] 225 - Vacuum tank;

[0045] 226 - Siphon valve;

[0046] 227 - Vacuum valve;

[0047] 23 - Waste oil recovery tank;

[0048] 3 - Washing system;

[0049] 31 - Water collecting tank;

[0050] 311 - First connecting pipe;

[0051] 312 - First water pump;

[0052] 32 - Heating box;

[0053] 321 - Heater;

[0054] 322 - Thermostat;

[0055] 323 - Liquid storage tank;

[0056] 324 - Second connecting pipe;

[0057] 3241 - Inner pipe;

[0058] 3242 - Outer pipe;

[0059] 325 - Second water pump;

[0060] 33 - Washing assembly;

[0061] 331 - Control box;

[0062] 332 - Rotating pipe;

[0063] 333 - Spraying pipe;

[0064] 334 - First gear;

[0065] 335 - Second gear;

[0066] 336 - Motor;

[0067] 337 - Spraying pipe valve;

[0068] 338 - Rotating pipe valve. Detailed implementation manners

[0069] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become more clear and definite. Among them, although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0070] In the first aspect of the present invention, there is provided a kitchen waste oil separation and pretreatment device with stirring and hot water cleaning, as Figure 1As shown, the device includes an oil removal tank 1, a siphon system 2, and a washing system 3. Among them,

[0071] The kitchen waste water is separated from oil and water in the oil removal tank. The separated waste oil is discharged by the siphon system 2, and the drained water after separation treatment enters the washing system 3 to wash the oil removal tank.

[0072] According to a preferred embodiment of the present invention, as Figure 1 shown, the oil removal tank 1 has a closed structure and is made of stainless steel, carbon steel, polymer material, or reinforced concrete.

[0073] In a further preferred embodiment, as Figure 2 shown, a water inlet pipe 11 is provided at the upper part of the side wall of the oil removal tank 1. The water inlet pipe 11 is tangent to the side wall of the oil removal tank, so that the water inlet flows along the direction of the pool wall.

[0074] Among them, the water inlet flows horizontally along the direction of the pool wall to form a swirl, which can increase the path of the sewage traveling in the pool, extend the oil-water separation time, and improve the oil-water separation effect. The oily waste water forms a swirl along the horizontal direction of the pipe wall in the tank, and uses the density difference of oil, water, and mud to form a stratification of upper-layer waste oil, middle-layer sewage, and lower-layer sludge.

[0075] In a further preferred embodiment, the size of the water inlet pipe 11 satisfies that the water flow velocity is 0.01 - 1.0 m / s, preferably 0.05 - 0.8 m / s, and more preferably 0.1 - 0.5 m / s.

[0076] According to a preferred embodiment of the present invention, a stirring device 12 is provided at the lower part of the side wall of the oil removal tank 1 to stir the kitchen waste water in the oil removal tank.

[0077] In the present invention, the stirring device is not particularly limited and may be a device with a water stirring function commonly used in the prior art.

[0078] In a further preferred embodiment, a drain pipe 13 and a sewage discharge pipe 14 are respectively provided at the middle part and the bottom part of the side wall of the oil removal tank 1 to discharge the treated waste water and sludge after stratification.

[0079] According to a preferred embodiment of the present invention, the siphon system 2 is arranged at the upper part of the oil removal tank 1 and includes a floating disk 21, an oil suction pipe 22, and an oil waste recovery tank 23 which are connected in sequence.

[0080] In a further preferred embodiment, as Figure 1 and 3 shown, the floating disk 21 includes a central disk 211 and wing plates 212.

[0081] The central disk 211 is concentrically arranged with the oil removal tank 1. One end of the fin 212 is fixedly connected to the central disk, and the other end is in rolling connection with the inner wall of the oil removal tank.

[0082] In a further preferred embodiment, the central disk 211 is frustum-shaped, and the cross-sectional area gradually increases from the top surface to the bottom surface.

[0083] The fin 212 is connected to the bottom edge of the central disk.

[0084] According to a preferred embodiment of the present invention, there are multiple fins 212, which are evenly distributed around the central disk.

[0085] Preferably, there are 4 fins 212, which are respectively arranged at the four equal division points of the circumference of the central disk.

[0086] In a further preferred embodiment, rollers 213 are arranged at one end of the fin 212 close to the inner wall of the oil removal tank.

[0087] At a position on the inner wall of the oil removal tank corresponding to the roller, a chute 15 is arranged.

[0088] Preferably, each fin is provided with 2 rollers, and there are also 2 corresponding chutes. The multiple chutes 15 are all parallel to the central axis of the oil removal tank.

[0089] In a further preferred embodiment, the density of the fin is less than the density of the oil, so that it is always in the waste oil layer.

[0090] In the present invention, fins are evenly arranged around the central disk, so that the central disk can maintain concentricity with the oil removal tank, has high stability under the condition of fluctuating wastewater in the tank, and the fins are in rolling connection with the inner wall of the oil removal tank, which can make the floating disk move slowly as a whole with the rollers, relieve the fluctuation of the liquid level, and keep the liquid level stable.

[0091] According to a preferred embodiment of the present invention, an oil-repellent layer is arranged on the lower surface of the fin 212 to prevent the adsorption of waste oil. Among them,

[0092] The oil-repellent layer is made of modified loofah sponge, and the modification is carried out according to the following steps:

[0093] Step 1, pre-treat the loofah sponge.

[0094] According to a preferred embodiment of the present invention, the pre-treatment is to soak the loofah sponge to remove impurities in the loofah sponge.

[0095] The soaking is carried out with an acetic acid solution.

[0096] Among them, loofah sponge is the vascular bundle in the loofah fruit, which has a unique three-dimensional porous physical structure and excellent mechanical strength, and can be made into a variety of washing, filtering and padding products. It is also a rich renewable resource, characterized by being inexpensive, degradable and environmentally friendly. In the present invention, the source of the loofah sponge is not particularly limited, and it is a common loofah sponge available commercially.

[0097] In a further preferred embodiment, the mass concentration of the acetic acid solution is 20% - 40%, preferably 28% - 35%, and more preferably 30%.

[0098] The inventors of the present invention have found that soaking the loofah sponge with the acetic acid solution of the above mass concentration can effectively remove impurities in the loofah sponge, and the addition amount of the acetic acid solution is appropriate to completely soak the loofah sponge.

[0099] In a still further preferred embodiment, heating is carried out to make the temperature of the acetic acid solution 60 - 80 °C, and the soaking time is 2.5 - 3.5 h.

[0100] Step 2: Wash the loofah sponge pretreated in Step 1, and then soak it in the modifier solution.

[0101] Among them, the washing is to wash the soaked loofah sponge with deionized water to wash the acetic acid solution clean to prevent reaction with the components in the modifier solution.

[0102] According to a preferred embodiment of the present invention, the modifier solution is composed of raw materials including the following parts by weight:

[0103]

[0104] Preferably, the modifier solution is composed of raw materials including the following parts by weight:

[0105]

[0106] In a further preferred embodiment, the hydrophilic particles are one or more of hydrophilic nano-silica, hydrophilic nano-titanium dioxide, and hydrophilic graphene oxide, and preferably hydrophilic nano-silica.

[0107] In a still further preferred embodiment, the particle size of the hydrophilic particles is 50 - 150 nm, preferably 70 - 130 nm, such as 100 nm.

[0108] According to a preferred embodiment of the present invention, the hydrophilic particles are prepared according to the following steps: Add 5 parts of nanoparticles, 0.5 - 0.8 parts of additive, and 40 - 60 parts of solvent into a reaction kettle, react at 40 - 70 °C for 3 - 8 h. After the reactants are cooled, filter the product under reduced pressure and dry it at room temperature for 15 - 24 h, then grind and sieve to obtain hydrophilic particles with hydroxyl groups on the surface.

[0109] In a further preferred embodiment, the additive is one or more of polyacrylic acid, polyacrylamide, oxalic acid, and trimethylsilanol.

[0110] The solvent is one or more of ethylene glycol, ethanol, n-butanol, and n-hexane.

[0111] According to a preferred embodiment of the present invention, the surfactant one is one of fatty alcohol polyoxyethylene ether 9, sodium lauryl ether sulfate, and sodium dodecyl sulfate.

[0112] According to a preferred embodiment of the present invention, the weight ratio of the loofah sponge to the modifier solution is 10:(50 - 150), preferably 10:(70 - 120), and more preferably 10:100.

[0113] The inventors of the present invention have found that when the weight ratio of the loofah sponge to the modifier solution is less than 10:50, the modification is incomplete; when the weight ratio of the loofah sponge to the modifier solution is greater than 10:150, the modification is already complete, and increasing the amount of the modifier solution will cause waste of resources.

[0114] Among them, adding the loofah sponge to the modifier solution for soaking is to introduce hydrophilic and oleophobic groups on the loofah sponge.

[0115] In a further preferred embodiment, the modifier solution is pre-heated, and the temperature after heating is 120 - 150 °C.

[0116] In a further preferred embodiment, the soaking time of the loofah sponge in the modifier solution is 3 - 7 h, preferably 4 - 6 h.

[0117] Among them, the solution is appropriately heated during the soaking process to maintain the temperature.

[0118] The inventors of the present invention have found that if the soaking time is too long, it will not increase the modification effect and will cause waste; if the soaking time is too short, the modification is incomplete and the hydrophilic and oleophobic effect is poor.

[0119] Step 3, dry the loofah sponge treated in step 2 to obtain the modified loofah sponge.

[0120] Among them, the drying is carried out at 100 - 140°C. When the drying temperature is lower than 100°C, the drying time is longer and the efficiency is low; when the drying temperature is higher than 140°C, it is easy to cause oxidation of the modified groups.

[0121] In the present invention, the obtained modified loofah sponge is made on the lower surface of the fin plate according to the conventional process in the prior art. During use, the oil-repellent layer (modified loofah sponge) is replaced according to the actual wastewater treatment volume. In the present invention, the replacement period of the oil-repellent layer is preferably set to 25 - 40 days, preferably 30 days, to ensure a good oil separation effect.

[0122] According to a preferred embodiment of the present invention, the oil suction pipe 22 includes two parts, namely a first pipe body 221 and a second pipe body 222. Among them,

[0123] One end of the first pipe body 221 is penetrated through the center position of the top surface of the center plate 211.

[0124] In a further preferred embodiment, the oil inlet of the first pipe body 221 is located above the bottom surface of the center plate 211, so that the oil suction pipe only sucks the liquid entering the inside of the center plate.

[0125] In the present invention, setting the oil inlet of the oil suction pipe above the bottom surface of the center plate can prevent the oil suction pipe from sucking wastewater.

[0126] Among them, as the height of the oil surface in the oil removal tank changes, the height of the center plate changes accordingly, and then the position of the first pipe body changes accordingly.

[0127] According to a preferred embodiment of the present invention, as Figure 4 shown, a telescopic pipe 223 is connected between the first pipe body 221 and the second pipe body 222, and it can extend or shorten correspondingly as the position of the first pipe body changes.

[0128] In a further preferred embodiment, the telescopic pipe 223 is made of a flexible material, preferably a flexible corrugated pipe made of PE material.

[0129] In a further preferred embodiment, a guide post 224 is arranged outside the telescopic pipe 223 to prevent the telescopic pipe 223 from generating a radial displacement and affecting the up and down movement of the floating disc.

[0130] Preferably, the guide post 224 is a hollow cylindrical structure, which is concentrically arranged with the telescopic pipe 223, and the inner diameter of the guide post is larger than the outer diameter of the telescopic pipe.

[0131] Among them, the top end of the guide post 224 is fixedly connected to the outer wall of the second pipe body 222.

[0132] According to a preferred embodiment of the present invention, a vacuum tank 225 and a siphon valve 226 are connected to the second pipe body 222 to suck the waste oil in the oil removal tank.

[0133] Wherein, a vacuum valve 227 is further provided on the vacuum tank 225.

[0134] According to a preferred embodiment of the present invention, the waste oil recovery tank 23 is connected to one end of the second pipe body 222 to store the siphoned waste oil.

[0135] In the present invention, the vacuum valve and the siphon valve are opened, so that the waste oil on the top layer of the oil removal tank enters the waste oil recovery tank under the action of vacuum siphon through the central disk, the first pipe body and the second pipe body of the oil suction pipe.

[0136] The inventor of the present invention found that after the equipment operates for a period of time, a certain amount of grease and sludge will accumulate on the inner wall of the oil removal tank, causing blockage and affecting the subsequent oil removal effect. Therefore, a washing system is preferably provided in the present invention.

[0137] According to a preferred embodiment of the present invention, as Figure 1 shown, the washing system 3 includes a water collection tank 31, a heating tank 32 and a washing component 33 which are arranged in sequence from bottom to top.

[0138] In a further preferred embodiment, the water collection tank 31 is arranged outside the oil removal tank 1,

[0139] Two water inlets are provided on the water collection tank 31, one is connected to the drain pipe 13 of the oil removal tank, and the other is connected to the tap water pipe.

[0140] Preferably, the drain pipe 13 is connected to the water collection tank 31 through a three-way valve 131, so that part of the water in the oil removal tank enters the water collection tank, and the other part is discharged or used for other purposes.

[0141] Wherein, the drain pipe 13 discharges the wastewater layer in the oil removal tank through a water pump or other suction devices.

[0142] In the present invention, the treated wastewater can be used to wash the oil removal tank, which can save water resources. When the treated wastewater is insufficient, tap water can be injected to make up for it.

[0143] In a further preferred embodiment, a first connecting pipe 311 and a first water pump 312 are provided on the top of the water collection tank 31 to pump the water in the water collection tank into the heating tank 32,

[0144] Wherein, the bottom end of the first connecting pipe 311 is close to the bottom of the water collection tank 31.

[0145] According to a preferred embodiment of the present invention, a heater 321 and a temperature controller 322 are provided in the heating tank 32, and the two are electrically connected.

[0146] Among them, the heater is used to heat the washing water to increase the water temperature, so as to promote the removal of grease and sludge on the inner wall of the oil removal tank. The temperature controller controls the heating frequency and heating efficiency of the heater by detecting the water temperature.

[0147] In the present invention, the heater and the temperature controller are not particularly limited and can be common devices in the prior art.

[0148] In a further preferred embodiment, a liquid storage tank 323 is provided at the top of the heating tank 32, and a valve is provided thereon, which can be opened or closed as needed.

[0149] A detergent is contained in the liquid storage tank 323 to efficiently remove the dirt on the inner wall of the tank.

[0150] Among them, mixing the detergent into the heated washing water can significantly improve the dirt removal efficiency.

[0151] According to a preferred embodiment of the present invention, the detergent is mixed from components including the following weight ratios:

[0152]

[0153] In a further preferred embodiment, the detergent is mixed from components including the following weight ratios:

[0154]

[0155] In an even more preferred embodiment, the detergent is mixed from components including the following weight ratios:

[0156]

[0157] Among them, due to the presence of lone pair electrons on the nitrogen atom, triethanolamine has weak alkalinity and can react with inorganic acids or organic acids to form salts. Adding triethanolamine to the detergent of the present invention can improve the characteristics of oily dirt, and at the same time, the detergency can be significantly improved by increasing the alkalinity.

[0158] According to a preferred embodiment of the present invention, the surfactant is selected from three or more of sodium alcohol ether carboxylate, triisopropanolamine oleate, sodium α-sulfo fatty acid methyl ester, sodium lauryl sulfate, lauroyl glutamate, monoglyceride stearate, sodium lignosulfonate, glucoside, and tea seed powder.

[0159] In a further preferred embodiment, the surfactant is selected from three or more of sodium alcohol ether carboxylate, sodium α-sulfo fatty acid methyl ester, lauroyl glutamate, glycerol monostearate, glucoside, and tea seed powder.

[0160] In a still further preferred embodiment, the surfactant is selected from three or more of sodium alcohol ether carboxylate, sodium α-sulfo fatty acid methyl ester, lauroyl glutamate, glucoside, and tea seed powder.

[0161] According to a preferred embodiment of the present invention, the surfactant is made from raw materials including the following weight components:

[0162] Glucoside 5 parts

[0163] Tea seed powder 10 - 20 parts

[0164] Sodium α-sulfo fatty acid methyl ester 3 - 8 parts.

[0165] In a further preferred embodiment, the surfactant is made from raw materials including the following weight components:

[0166] Glucoside 5 parts

[0167] Tea seed powder 13 - 17 parts

[0168] Sodium α-sulfo fatty acid methyl ester 5 - 7 parts.

[0169] In a still further preferred embodiment, the surfactant is made from raw materials including the following weight components:

[0170] Glucoside 5 parts

[0171] Tea seed powder 15 parts

[0172] Sodium α-sulfo fatty acid methyl ester 6 parts.

[0173] In the present invention, the glucoside is synthesized from natural fatty alcohol and glucose, and is a new type of non-ionic surfactant with relatively comprehensive properties. It has the characteristics of both ordinary non-ionic and anionic surfactants, has high surface activity and good ecological safety, and at the same time has low surface tension, no cloud point, strong detergency, strong compatibility, rapid and complete biodegradation, and can be compounded with any type of surfactant, with obvious synergistic effects.

[0174] Tea seed powder is commercially available and contains 15 - 18% of tea saponin, and has strong ability to remove oil and dirt. Tea saponin is a non-ionic surfactant, which can reduce the surface tension of water, produce persistent foam, and has the functions of emulsification, dispersion, and wetting.

[0175] Sodium α-sulfo fatty acid methyl ester has good hydrolysis stability and strong detergency.

[0176] The inventor of the present invention has found that by compounding the above three types of surfactants in a corresponding proportion, the washing efficiency and washing quality can be significantly improved. Among them, the compounding is obtained by mixing the three surfactants according to the weight ratio.

[0177] In the present invention, the detergent is prepared by a method including the following steps:

[0178] Step 1: Weigh the raw materials by weight parts, and sequentially add deionized water, citric acid and triethanolamine, and stir and mix evenly.

[0179] Among them, the stirring and mixing is carried out in a blender, and adding in the above order sequentially helps to mix and dissolve.

[0180] According to a preferred embodiment of the present invention, the stirring speed is 60-90 r / min, and the stirring time is 15-30 min.

[0181] Preferably, the stirring speed is 70-90 r / min, and the stirring time is 15-25 min.

[0182] More preferably, the stirring speed is 75-85 r / min, and the stirring time is 18-22 min.

[0183] In a further preferred embodiment, the stirring is carried out under heating conditions, and the heating temperature is 50-80 °C, preferably 55-70 °C, more preferably 65-70 °C.

[0184] The inventor has found that under the above stirring conditions (speed, time, temperature), the mixing and dissolving speed is the fastest, and the performance of the prepared detergent is the best.

[0185] Step 2: Add the surfactant to the mixed solution in Step 1, stir and mix evenly, and let it stand to obtain the detergent.

[0186] According to a preferred embodiment of the present invention, the conditions for the stirring and mixing are as follows:

[0187] The stirring speed is 40-60 r / min, preferably 50-55 r / min, such as 53 r / min;

[0188] The stirring time is 18-35 min, preferably 22-30 min, more preferably 25-28 min;

[0189] The stirring temperature is 30-45 °C, preferably 35-42 °C, more preferably 40 °C.

[0190] In a further preferred embodiment, the standing time is 1 to 2 h, preferably 1.5 h.

[0191] According to a preferred embodiment of the present invention, a second connecting pipe 324 and a second water pump 325 are provided at the top of the heating box 32 to pump the water in the heating box into the washing assembly.

[0192] According to a preferred embodiment of the present invention, the washing assembly 33 includes a control box 331, a rotating pipe 332, and a spray pipe 333.

[0193] In a further preferred embodiment, as Figure 5 shown, a first gear 334 and a second gear 335 which are meshed are arranged in the control box 331, wherein,

[0194] the first gear 334 is connected to the main shaft of the motor 336 and rotates under the action of the motor, and drives the second gear to rotate.

[0195] In a further preferred embodiment, the second connecting pipe 324 is arranged at the upper central position of the second gear 335.

[0196] According to a preferred embodiment of the present invention, the second connecting pipe 324 includes an inner pipe 3241 and an outer pipe 3242 which are concentrically arranged, wherein,

[0197] the outer wall of the outer pipe 3242 is rotatably connected to the second gear 335, preferably connected by a bearing, so that the second gear can rotate relative to the second connecting pipe;

[0198] the inner pipe 3241 and the outer pipe 3242 are fixedly connected.

[0199] In a further preferred embodiment, the bottom end of the inner pipe 3241 extends out of the bottom end of the outer pipe 3242 and extends into the inside of the rotating pipe 332.

[0200] In a further preferred embodiment, the rotating pipe 332 is fixedly connected to the second gear 335, and its movement track is the same as that of the second gear.

[0201] In the present invention, the first gear rotates under the action of the driving motor, drives the second gear to rotate under the meshing action, and further drives the rotating pipe to rotate. Among them, the inner pipe and the outer pipe of the second connecting pipe both keep their positions unchanged, and the second gear rotates relative to the outer pipe of the second connecting pipe.

[0202] According to a preferred embodiment of the present invention, as Figure 6 shown, a plurality of spray pipes 333 are communicated and arranged at the lower part of the rotating pipe 332,

[0203] The multiple spray pipes are arranged in rows and evenly distributed on the outer wall of the rotating pipe.

[0204] In a further preferred embodiment, a spray pipe valve 337 is provided between the rotating pipe and the spray pipe to control the opening or closing of different spray pipes according to actual needs.

[0205] In an even more preferred embodiment, the spray pipe 333 is arranged to incline downward, and the included angle with the central axis of the rotating pipe 332 is 30 - 60°, preferably 40 - 50°.

[0206] Preferably, a rotating pipe valve 338 is provided at the bottom end of the rotating pipe 332, so that the washing water can be directly discharged through the bottom of the rotating pipe.

[0207] In the present invention, the washing system is provided with two modes, namely a hot water spray washing mode and a hot water flushing mode. In the spray washing mode, the spray pipe valve is opened and the rotating pipe valve is closed. The washing water is discharged through the spray pipe and the spray direction can be adjusted as the rotating pipe rotates to comprehensively spray wash the inner wall of the oil removal tank. In the flushing mode, the spray pipe valve is closed and the rotating pipe valve is opened, so that the washing water only enters through the rotating pipe, and the oil removal tank can be quickly filled with flushing hot water for rapid washing.

[0208] According to a preferred embodiment of the present invention, the device further includes a control system, and the control system is a PLC control system to control the washing system to perform periodic automatic cleaning.

[0209] Among them, the control system is electrically connected to the water inlet system, vacuum valve, siphon valve, water pump, heater, temperature controller, valve of the liquid storage tank, motor, three-way valve, etc. to control the operation of each system.

[0210] In the second aspect of the present invention, a method for pretreating kitchen waste water is provided. Preferably, it is carried out by using the kitchen waste water oil separation pretreatment device with stirring and hot water cleaning described in the first aspect. The method includes the following steps:

[0211] Step I: Feed the kitchen waste water to be treated into the oil removal tank through the water inlet pipe.

[0212] Among them, the size of the water inlet pipe satisfies that the water flow velocity is 0.01 - 1.0 m / s.

[0213] Step II: After the waste water in the oil removal tank is stratified, open the vacuum tank and the siphon valve to vacuum siphon the waste oil layer.

[0214] Among them, Step II includes the following sub-steps:

[0215] Step II-1: Turn on the stirring device to stir the food waste wastewater in the oil removal tank to promote the stratification of the wastewater.

[0216] Among them, since the inlet pipe is tangent to the side wall of the oil removal tank and the water enters horizontally to form a swirl, it can increase the path of the sewage traveling in the tank, extend the oil-water separation time, and improve the oil-water separation effect.

[0217] In the present invention, it is preferred to turn on the stirring device while introducing the food waste wastewater, which can timely stir the introduced wastewater, promote the rapid stratification of the food waste wastewater into upper-layer waste oil, middle-layer sewage, and lower-layer sludge, and improve the oil removal efficiency.

[0218] Step II-2: After the food waste wastewater is introduced for 0.25 - 1 hour, preferably 0.5 hour, turn on the vacuum valve and the siphon valve to perform vacuum siphoning on the upper-layer waste oil of the wastewater.

[0219] In the present invention, the closing of the vacuum valve and the siphon valve is regulated by the PLC automatic control system. Preferably, a detection device is provided near the oil inlet of the first pipe body 221 to monitor the pressure value or the pressure change value of the suction medium, or to monitor the viscosity of the suction medium, etc. The detection device is preferably a pressure sensor. When the detected pressure change value is 10 Kpa or 0.1 standard atmospheric pressure, the siphon valve and the vacuum valve are closed.

[0220] In the present invention, the detection device near the oil inlet is not particularly limited as long as it can detect the change of the suction medium. The selected pressure sensor can be a commonly used sensor in the prior art, such as the PX309 series of OMEGA.

[0221] Among them, the vacuum valve and the siphon valve are controlled to be opened by the control system to perform vacuum siphoning on the separated oil layer.

[0222] Step III: After the equipment operates for a period of time, turn on the washing system to perform hot water washing.

[0223] The inventor of the present invention has found that after the equipment operates for a period of time, a certain amount of grease and sludge will accumulate on the inner wall of the oil removal tank, causing blockage and affecting the subsequent oil removal effect. Therefore, in the present invention, it is preferred to control the washing system to be turned on periodically through the control system to ensure the best sanitary conditions and oil removal efficiency of the equipment.

[0224] According to a preferred embodiment of the present invention, the opening period of the washing system is 10 - 20 days, preferably 14 days.

[0225] Among them, before washing, the oil layer, water layer, and mud layer in the oil removal tank are respectively discharged. The water in the water layer enters the collection tank through a part of the drain pipe 13, and the other part is discharged or used for other purposes.

[0226] In a further preferred embodiment, a hot water spraying mode or a hot water flushing mode is selected according to the oil content in the influent water to wash the inner wall of the oil removal tank. When the oil content of the wastewater is higher than or equal to 600 mg / L, the hot water spraying mode is selected; when the oil content of the wastewater is lower than 600 mg / L, the hot water flushing mode is selected.

[0227] Among them, when the hot water spraying mode is selected, the heater 321, the temperature controller 322 and the spray pipe valve 337 are turned on through the control system, so that the heated hot water is discharged from the spray pipe 333. At the same time, the motor is controlled to rotate through the control system, and then the rotating pipe drives the spray pipe to rotate, so as to wash the inner wall of the oil removal tank from multiple angles and in all directions.

[0228] When the hot water flushing mode is selected, the spray pipe valve is closed through the control system, and the rotating pipe valve is opened, so that the heated water is discharged from the bottom of the rotating pipe, so as to quickly inject flushing hot water into the oil removal tank.

[0229] In the present invention, for the water used for washing in the above two modes, while heating, the valve of the liquid storage tank is opened through the control system to heat the detergent in the water.

[0230] According to a preferred embodiment of the present invention, the detergent is mixed from components including the following weight ratios:

[0231]

[0232] In a further preferred embodiment, the detergent is mixed from components including the following weight ratios:

[0233]

[0234] In an even further preferred embodiment, the detergent is mixed from components including the following weight ratios:

[0235]

[0236] Preferably, the addition amount of the detergent to the volume of water in the heating tank is (1-3):100, preferably 2:100.

[0237] The inventor of the present invention has found through research that during the washing process, the addition amount of the detergent in the present invention is small, but the washing effect is good, and it can effectively remove the grease and dirt on the tank wall.

[0238] Examples

[0239] Example 1

[0240] Oil removal tank:

[0241] In this embodiment, the oil removal tank is made of stainless steel material. The water inlet pipe is tangent to the side wall of the oil removal tank, and the size of the water inlet pipe meets the requirement of a water flow velocity of 0.2 m / s.

[0242] Siphon system:

[0243] The floating disc of the siphon system has 4 wing plates, which are arranged at the four equal division points of the circumference of the central disc, and 2 rollers are arranged at the end of each wing plate;

[0244] The oil repellent layer on the lower surface of the wing plate is prepared from modified loofah sponge. The modified loofah sponge is prepared according to the following method:

[0245] (1) Take 0.5 kg of loofah sponge, add acetic acid solution with a mass concentration of 30% to completely soak it, heat the acetic acid solution to a temperature of 70 °C, and soak for 3 h;

[0246] (2) Wash the loofah sponge soaked in step 1 with deionized water, wash it 3 times, and then soak it in 5 kg of modifier solution preheated to 130 °C.

[0247] The components and contents in the modifier solution are as follows: hydrophilic nano-silica with a particle size of 100 nm: polyvinyl alcohol: methacrylic acid: sodium lauryl polyoxyethylene ether sulfate: deionized water = 5:15:70:35:90;

[0248] Among them, the hydrophilic nano-silica is obtained by reacting nano-silica, oxalic acid and ethylene glycol in a weight ratio of 5:0.6:50 at 60 °C for 5 h, cooling and then filtering under reduced pressure, and drying at room temperature for 20 h and then grinding and sieving;

[0249] Soak the loofah sponge in the modifier solution for 5 h;

[0250] (3) Dry the loofah sponge obtained in step 2 at 120 °C to obtain the modified loofah sponge;

[0251] The telescopic pipe is made of flexible corrugated pipe of PE material.

[0252] Washing system:

[0253] The detergent in the liquid storage tank is prepared according to the following steps: First, add deionized water, citric acid and triethanolamine (the weight ratio of the three is 100:18:32) to a blender (model: BL200.S digital display constant speed strong blender) in sequence, the stirring speed is 80 r / min, the stirring time is 20 min, and the stirring temperature is 68 °C;

[0254] Then, a surfactant (weight ratio with deionized water is 23:100) is added to the above-mentioned mixed solution. Among them, the weight ratio of glucoside, tea seed powder (tea saponin content is 15% - 18%, purchased from Huayin Camellia oleifera Co., Ltd., Anhui Province) and sodium methyl α-sulfo fatty acid ester is 5:15:6. During the addition of the surfactant, continuous stirring is carried out. The stirring speed is 53 r / min, the stirring time is 26 min, the stirring temperature is 40 °C. After stirring evenly, it is left standing for 1.5 h to obtain the detergent.

[0255] Six spray pipes are arranged in three layers at the lower part of the rotating pipe, and the included angle between each spray pipe and the central axis of the rotating pipe is 45°;

[0256] The washing method of hot water spraying is adopted.

[0257] Example 2

[0258] The method used in this example is similar to that in Example 1, except that the weight ratio of deionized water, citric acid and triethanolamine in the detergent in the liquid storage tank is 100:20:40, the stirring speed is 60 r / min, the stirring time is 30 min, and the stirring temperature is 75 °C.

[0259] Example 3

[0260] The method used in this example is similar to that in Example 1, except that the weight ratio of deionized water, citric acid and triethanolamine in the detergent in the liquid storage tank is 100:17:28, the stirring speed is 90 r / min, the stirring time is 18 min, and the stirring temperature is 70 °C.

[0261] Example 4

[0262] The method used in this example is similar to that in Example 1, except that the weight ratio of glucoside, tea seed powder (tea saponin content is 15% - 18%) and sodium methyl α-sulfo fatty acid ester in the detergent is 5:10:3.

[0263] Example 5

[0264] The method used in this example is similar to that in Example 1, except that the weight ratio of glucoside, tea seed powder (tea saponin content is 15% - 18%) and sodium methyl α-sulfo fatty acid ester in the detergent is 5:13:5.

[0265] Example 6

[0266] The method used in this example is similar to that in Example 1, except that the weight ratio of glucoside, tea seed powder (tea saponin content is 15% - 18%) and sodium methyl α-sulfo fatty acid ester in the detergent is 5:17:7.

[0267] Example 7

[0268] The method used in this embodiment is similar to that in Embodiment 1, except that during the addition of the surfactant, the stirring speed is 40 r / min, the stirring time is 30 min, and the stirring temperature is 35 °C.

[0269] Example 8

[0270] The method used in this embodiment is similar to that in Embodiment 1, except that during the addition of the surfactant, the stirring speed is 60 r / min, the stirring time is 22 min, and the stirring temperature is 38 °C.

[0271] Example 9

[0272] The method used in this embodiment is similar to that in Embodiment 1, except that during the addition of the surfactant, the stirring speed is 55 r / min, the stirring time is 28 min, and the stirring temperature is 42 °C.

[0273] Example 10

[0274] The method used in this embodiment is similar to that in Embodiment 1, except that the size of the inlet pipe satisfies a water flow velocity of 0.5 m / s;

[0275] The angle between the spray pipe and the axis of the rotating pipe is 60°;

[0276] The washing method of hot water rinsing is adopted.

[0277] Experimental example:

[0278] Experimental Example 1

[0279] The equipment described in Embodiments 1 to 10 is used to separately carry out oil separation pretreatment on artificially prepared simulated kitchen wastewater.

[0280] The preparation method of the simulated kitchen wastewater is as follows: 0.4 g / L of blended oil and 0.2 g / L of lard are added to clear water, and 0.005% of sodium dodecylbenzenesulfonate is added. After stirring with a stirring paddle at a speed of 1500 rpm for 12 min, it is placed in a containing container, and then enters the oil removal tank through the inlet pipe. Among them, the simulated wastewater is always stirred at a speed of 1000 rpm in the container to avoid the aggregation and floating of oil droplets.

[0281] After discharging the waste oil using the equipment in the embodiment, the oil content of the wastewater and the oil content rate of the discharged waste oil are detected, and the results are shown in Table 1:

[0282] Table 1

[0283]

[0284]

[0285] As can be seen from Table 1, for the kitchen waste water treated by the equipment described in Embodiments 1 to 10 of the present invention, the oil content in the effluent during the oil removal cycle is lower than 90 mg / L, the oil content rate of the waste oil is above 70%, and due to the relatively high stirring intensity used for the simulated waste water, the dispersion degree of the total oil droplets in the simulated waste water is higher than that of the actual catering waste water, indicating that the oil separation pretreatment equipment described in the present invention has a good oil separation effect and can effectively treat kitchen waste water.

[0286] Experimental Example 2

[0287] Detect the detergency of the detergents described in Embodiments 1 to 9. The specific operation is as follows:

[0288] (1) Prepare artificial dirt:

[0289] Proportion of each raw material: 10% mixed oil, 15% wheat flour, 7.5% whole milk powder, 30% fresh whole egg liquid, 32.5% distilled water.

[0290] First, remove the shells of fresh eggs and place them in a clean beaker, stir evenly and set aside; then, place the mixed oil in the beaker and heat it to 50 - 60 °C until completely melted, then pour in the evenly mixed wheat flour and whole milk powder and stir evenly; then, add the fresh egg liquid to the beaker in several portions and stir evenly; finally, add water to the beaker in several portions and stir into delicate artificial dirt.

[0291] (2) After boiling a glass slide in a conventional dishwashing liquid solution (reference concentration: 10 g / L) for 15 min, first wash it with tap water until no water droplets hang, then soak it in a citric acid solution (reference concentration: 10 g / L) for 1 h, then rinse it twice with tap water first, then wash it twice with deionized water, and finally place it in absolute ethanol and ultrasonicate it for 20 min, then place it in an 80 °C oven and bake it for 1.5 h, and then cool it for standby.

[0292] (3) Place the cleaned glass slide on an analytical balance and weigh it precisely (accurate to 1 mg), and this mass is denoted as m0. Place the prepared artificial dirt and the brush on an electronic balance (accurate to 0.01 g), and use the subtraction method to control the amount of oil stain applied. For the stain application, first apply it on one side, dry it in an oven, and then apply it on the other side. Generally, hold the glass slide horizontally in the air, use the brush to evenly apply the artificial stain on the glass slide, and then place the glass slide flat on the tray. The mass of the stain applied on one side is controlled within 0.30 g - 0.35 g. After applying the stain on one side of all the glass slides, place them in an 80°C oven and bake for 30 min, then take them out and let them cool. Then apply the stain on the other side, and the mass of the stain applied is also controlled within 0.30 g - 0.35 g. After application, place them in an 80°C oven again and bake for 1 h. Take them out and cool to room temperature, then place them on an analytical balance and weigh precisely (accurate to 1 mg), and this mass is denoted as m1. m1 - m0 is the mass of the dirt coated on the glass slide, and the error in the amount of this dirt between different glass slides should be controlled within 0.5%.

[0293] (4) Weigh 0.5 g of the detergent samples prepared in Examples 1 - 9 and place them in the washing bucket of a vertical decontamination machine. Put the known-weight dirty slides together with the washing rack into the washing bucket accordingly. Measure 40 mL of 2500 ppm hard water and pour it into the washing bucket. Measure 960 mL of deionized water at 50°C and pour it into the washing bucket. After adding water for the last sample, start the decontamination machine to start washing. After 30 min, the machine will stop automatically. Take out the washing rack, place the washed glass slides together with the washing rack in an 80°C oven and bake for 1 h, then take them out and let them cool and weigh as m2.

[0294] Calculate the decontamination rate. The decontamination rate (%) = (m1 - m2) / (m1 - m0) * 100% where m0 is the mass of the glass slide before applying the stain, g; m1 is the mass of the glass slide after applying the stain, g; m2 is the mass of the glass slide after washing, g.

[0295] The decontamination rate detection results of the detergents described in Examples 1 - 9 are shown in Table 2 as follows:

[0296] Table 2

[0297] Detergency rate (%) Example 1 85.69 Example 2 83.45 Example 3 81.95 Example 4 84.03 Example 5 82.64 Example 6 83.21 Example 7 82.45 Example 8 81.92 Example 9 84.06

[0298] As can be seen from Table 2, the detergents prepared in the examples of the present invention have a relatively high decontamination rate. When added to the washing water, they can effectively remove the grease and dirt on the inner wall of the oil removal tank, ensuring the normal operation of the equipment.

[0299] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", etc. is the orientation or positional relationship based on the working state of the present invention. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0300] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0301] The present invention has been described in combination with preferred embodiments above. However, these embodiments are only exemplary and only serve an illustrative role. On this basis, various substitutions and improvements can be made to the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An oil separation pretreatment device for kitchen waste water with stirring and hot water cleaning, characterized in that, The device includes an oil removal tank (1), a siphon system (2) and a washing system (3), wherein, the kitchen waste water is separated from oil and water in the oil removal tank, and the separated waste oil is discharged by the siphon system (2), and the drained water after separation treatment enters the washing system (3) to wash the oil removal tank; a water inlet pipe (11) is arranged at the upper part of the side wall of the oil removal tank (1), and the water inlet pipe (11) is tangent to the side wall of the oil removal tank, so that the water inlet flows along the direction of the pool wall; the siphon system (2) is arranged at the upper part of the oil removal tank (1), and includes a floating disc (21), an oil suction pipe (22) and a waste oil recovery tank (23) which are connected in sequence; the floating disc (21) includes a central disc (211) and wing plates (212); the central disc (211) is concentrically arranged with the oil removal tank (1), one end of the wing plate (212) is fixedly connected with the central disc, and the other end is in rolling connection with the inner wall of the oil removal tank; there are 4 wing plates (212), which are respectively arranged at the four equal division points of the circumference of the central disc; rollers (213) are arranged at one end of the wing plate (212) close to the inner wall of the oil removal tank; chute grooves (15) are arranged at the positions on the inner wall of the oil removal tank corresponding to the rollers; each wing plate is provided with 2 rollers, and correspondingly there are also 2 chute grooves, and the multiple chute grooves (15) are all parallel to the central axis of the oil removal tank; the density of the wing plate is less than that of the oil, so that it is always in the waste oil layer; an oil repellent layer is arranged on the lower surface of the wing plate (212) to prevent the adsorption of waste oil. The oil repellent layer is made of modified loofah sponge, and the modification is carried out according to the following steps: Step 1, pre-treat the loofah sponge. The pre-treatment is to soak the loofah sponge to remove impurities in the loofah sponge; Step 2, wash the loofah sponge pretreated in Step 1, and then soak it in a modifier solution; the modifier solution is composed of raw materials including the following parts by weight: Step 3, dry the loofah sponge treated in Step 2 to obtain the modified loofah sponge; the washing system (3) includes a water collection tank (31), a heating tank (32) and a washing component (33) which are arranged in sequence from bottom to top; a first connecting pipe (311) and a first water pump (312) are arranged at the top of the water collection tank (31) to pump the water in the water collection tank into the heating tank (32); the washing component (33) includes a control box (331), a rotating pipe (332) and a spray pipe (333); a first gear (334) and a second gear (335) which are meshed are arranged in the control box (331), wherein, the first gear (334) is connected to the main shaft of the motor (336), rotates under the action of the motor, and drives the second gear to rotate; a plurality of spray pipes (333) are communicated and arranged at the lower part of the rotating pipe (332); the plurality of spray pipes are arranged in rows and evenly distributed on the outer wall of the rotating pipe; spray pipe valves (337) are arranged between the rotating pipe and the spray pipes to control the opening or closing of different spray pipes according to actual needs; The spray pipe (333) is arranged to slope downwards, and the angle with the central axis of the rotating pipe (332) is 30 to 60°; A rotating pipe valve (338) is arranged at the bottom end of the rotating pipe (332), so that the washing water can be directly discharged through the bottom of the rotating pipe.

2. The device according to claim 1, characterized in that, The oil suction pipe (22) includes two parts, namely a first pipe body (221) and a second pipe body (222), where One end of the first pipe body (221) penetrates through the center position of the top surface of the central disk (211); A telescopic pipe (223) is connected between the first pipe body (221) and the second pipe body (222), and it can extend or shorten correspondingly with the change of the position of the first pipe body.

3. The device according to claim 1, characterized in that, A heater (321) and a temperature controller (322) are arranged in the heating box (32), and the two are electrically connected.

4. The device according to claim 1, characterized in that, A liquid storage tank (323) is arranged at the top of the heating box (32), A detergent is contained in the liquid storage tank (323) to efficiently remove the dirt on the inner wall of the tank.

5. A pretreatment method for kitchen waste water is carried out by using the kitchen waste water oil separation pretreatment equipment with stirring and hot water cleaning described in any one of claims 1 to 4, and is characterized in that, The method includes the following steps: Step I, introducing the to-be-treated kitchen waste water into the oil removal tank through the water inlet pipe; Step II, after the waste water in the oil removal tank is stratified, opening the vacuum tank and the siphon valve to vacuum-siphon the waste oil layer; Step III, after the equipment operates for a period of time, opening the washing system to perform hot water washing.

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