A method for purifying waste cooking oil and a treatment device based on the method

Abstract

The invention discloses a method for purifying and treating waste kitchen oil and a treatment device based on the method, comprising the following steps: filtering the waste kitchen oil after heating, filtering some solid impurities and performing sedimentation separation, obtaining crude oil and oil residue after sedimentation separation; after filtering the crude oil, adding the crude oil and waste glycerol in a ratio of 10:1, adding a certain amount of water, and having a stronger ability to wash colloids, and then separating through a butterfly centrifuge, obtaining oil for drying, and treating the separated wastewater for sewage treatment; the oil residue is homogenized by heating, and ionization occurs when boiling at 90 degrees, and then undergoes three-phase separation to obtain crude oil, wastewater and solid residue from top to bottom, and the obtained crude oil is treated again through step 2), and the wastewater is treated for sewage treatment. Compared with the prior art, the invention not only treats the waste oil cleanly to meet the requirement of reducing environmental pollution, but also meets the requirement of manufacturing biodiesel raw materials, and has important significance for the existing kitchen waste treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen waste treatment, and in particular to a method for purifying kitchen waste oil and a treatment device based on the method. Background Art

[0002] my country has a large population, and daily communication has invisibly driven the rapid development of the catering industry, adding a lot of vitality to the added value of my country's economic development. The rapid development of the catering industry has brought about the generation of a large amount of food waste. Under traditional process conditions, food waste is directly dragged to the garbage treatment plant as garbage, which increases the difficulty and efficiency of garbage treatment, and the economic cost of treatment is difficult to estimate. If part of the oil contained in food waste can be utilized and then treated as garbage, not only will the amount of garbage treatment be greatly reduced, but also the useful oil in the food waste can be effectively obtained, and high value-added biodiesel products can be obtained from it for industrial production.

[0003] At present, the waste oil in domestic kitchen waste is filtered after heating, and some solid impurities are filtered and then separated by sedimentation. After sedimentation and separation, crude oil and oil residue are obtained. The crude oil raw material is used to produce biodiesel, but the impurities in the crude oil include colloids (phospholipids and proteins), tiny solid particles and water. When used as raw materials for manufacturing biodiesel, these phospholipids and proteins, tiny particles and water are prone to catalyst poisoning; the oil residue contains 30-40% grease and sand and mud, and the grease separation process is slow. After being discharged into a large pool and heated and precipitated, the acid value increases and the environment is polluted after a long stacking time. In addition, the mud and sand are easy to pollute the environment. How to improve the above purification treatment method, not only to clean the waste oil to meet the requirements of reducing environmental pollution, but also to meet the requirements of manufacturing biodiesel raw materials, is of great significance to the existing kitchen waste treatment. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a method for purifying waste kitchen oil, which can effectively obtain useful pure oil from kitchen waste, achieve higher economic benefits, significantly reduce the amount of garbage after obtaining the oil, and improve the efficiency of garbage treatment.

[0005] Another object of the present invention is to provide a treatment device based on the method for purifying waste cooking oil.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a method for purifying waste cooking oil, comprising the following steps:

[0007] 1) After heating, the waste cooking oil is filtered, and some solid impurities are filtered out and then separated by sedimentation. After sedimentation separation, crude oil and oil residue are obtained;

[0008] 2) After the crude oil is filtered, the crude oil and the waste glycerol required for biodiesel production are added in a ratio of 10:1, and a certain amount of water is added. Waste glycerol is a strong polar solvent with a density of 1.26, and water is a polar solvent with a density of 1.0. After the two are mixed with the crude oil, they become an emulsion with increased density, stronger adsorption force, and stronger ability to wash colloids. After that, they are separated by a butterfly centrifuge with a large centrifugal force and sufficient separation. The clean oil is then dried, and the separated wastewater is treated for sewage;

[0009] 3) The oil residue is homogenized by heating, and ionization occurs when boiling at 90 degrees. At this time, the separation effect is good. After three-phase separation, crude oil, wastewater and solid residue (compost) are obtained from top to bottom. The crude oil is treated again through step 2), and the wastewater is treated as sewage.

[0010] A treatment device based on a method for purifying waste cooking oil comprises a treatment chamber, wherein a crude oil inlet and a waste glycerin inlet are respectively arranged at the top of the treatment chamber, and a waste glycerin outlet is arranged at the bottom of the treatment chamber, and the waste glycerin outlet is connected to a high-pressure pump outside the treatment chamber, and the high-pressure pump enters the treatment chamber through an input pipe, and a nozzle is arranged at the end of the input pipe inside the treatment chamber; a cylindrical partition is arranged inside the treatment chamber, and the top and bottom of the partition are both in an open state, wherein an arc-shaped cover plate is arranged above the top opening of the partition, and a nozzle is arranged at the bottom opening of the partition.

[0011] Furthermore, a waste glycerin outlet is provided at the bottom of the processing chamber.

[0012] When the kitchen waste oil purification treatment device provided by the present invention is working, the waste glycerin has a large density and is stationary at the bottom and cannot be integrated with the crude oil. The waste glycerin that is continuously stationary at the bottom is continuously sprayed upward to make the waste glycerin merge with the crude oil in a loose state. Since water is a polar solvent and glycerin is a strong polar solvent, the density of glycerin is 1.26 and that of water is 1.0. After the two are mixed with the crude oil, they become an emulsion with increased density, stronger adsorption force, and stronger ability to wash colloids. After a certain period of fusion, the colloids in the waste oil are adsorbed and washed. After reaching the set fusion time, the waste glycerin is discharged from the waste glycerin outlet to the outside of the treatment chamber after being stationary and precipitated.

[0013] The beneficial effects of the present invention are: not only can the waste oil be treated cleanly to meet the requirement of reducing environmental pollution, but also the requirement of manufacturing biodiesel raw materials can be met, which is of great significance to the existing restaurant waste treatment; useful oil can be effectively obtained from restaurant waste, and higher economic benefits can be obtained. The amount of garbage after obtaining the oil is greatly reduced, thereby improving the efficiency of garbage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The structure and features of the present invention are further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Attached Figure 1 In, attached Figure 1 Among them, 1. crude oil inlet, 2. waste glycerin inlet, 3. waste glycerin outlet, 4. high-pressure pump, 5. nozzle, 6. cylindrical partition, 7. arc cover plate, 8. processing chamber. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] The present invention provides a method for purifying waste cooking oil, which is achieved by the following steps:

[0019] 1) After heating, the waste cooking oil is filtered, and some solid impurities are filtered out and then separated by sedimentation. After sedimentation separation, crude oil and oil residue are obtained;

[0020] 2) After the crude oil is filtered, the crude oil and the waste glycerol required for biodiesel production are added in a ratio of 10:1, and a certain amount of water is added. Waste glycerol is a strong polar solvent with a density of 1.26, and water is a polar solvent with a density of 1.0. After the two are mixed with the crude oil, they become an emulsion with increased density, stronger adsorption force, and stronger ability to wash colloids. After that, they are separated by a butterfly centrifuge with a large centrifugal force and sufficient separation. The obtained oil is dried, and the separated wastewater is treated for sewage;

[0021] 3) The oil residue is homogenized by heating, and ionization occurs when boiling at 90 degrees. At this time, the separation effect is good. After three-phase separation, crude oil, wastewater and solid residue (compost) are obtained from top to bottom. The crude oil is treated again through step 2), and the wastewater is treated as sewage.

[0022] Attached Figure 1 An embodiment of the present invention discloses a device for purifying and treating waste cooking oil, comprising a treatment chamber 8, wherein a crude oil inlet 1 and a waste glycerin inlet 2 are respectively arranged at the top of the treatment chamber 8, and a waste glycerin outlet 3 is arranged at the bottom of the treatment chamber 8, wherein the waste glycerin outlet 3 is connected to a high-pressure pump 4 outside the treatment chamber 8, wherein the high-pressure pump 4 enters the treatment chamber 8 through an input pipe, and a nozzle 5 is arranged at the end of the input pipe inside the treatment chamber 8; wherein a cylindrical partition 6 is arranged inside the treatment chamber 8, wherein the top and the bottom of the partition 6 are both in an open state, wherein an arc-shaped cover plate 7 is arranged above the top opening of the partition 6, and the nozzle 5 is arranged at the bottom opening of the partition 6, and a waste glycerin outlet 3 is also arranged at the bottom of the treatment chamber 8.

[0023] When the kitchen waste oil purification treatment device provided by the present invention is working, the waste glycerin has a large density and is stationary at the bottom and cannot be integrated with the crude oil. The waste glycerin that is continuously stationary at the bottom is continuously sprayed upward to make the waste glycerin merge with the crude oil in a loose state. Since water is a polar solvent and glycerin is a strong polar solvent, the density of glycerin is 1.26 and that of water is 1.0. After the two are mixed with the crude oil, they become an emulsion with increased density, stronger adsorption force, and stronger ability to wash colloids. After a certain period of fusion, the colloids in the waste oil are adsorbed and washed. After reaching the set fusion time, the waste glycerin is discharged from the waste glycerin outlet to the outside of the treatment chamber after being stationary and precipitated.

[0024] The above description is only a preferred embodiment of the present invention. The above specific embodiments are not limitations of the present invention. Any modifications, changes or equivalent substitutions made by ordinary technicians in the field based on the above description shall fall within the protection scope of the present invention.

Claims

1. A method for purifying waste cooking oil, characterized in that The following steps are involved: 1) After heating, the waste cooking oil is filtered, and some solid impurities are filtered out and then separated by sedimentation. After sedimentation separation, crude oil and oil residue are obtained; 2) After the crude oil is filtered, the crude oil and the waste glycerol required for biodiesel production are added in a ratio of 10:1, and a certain amount of water is added. Waste glycerol is a strong polar solvent with a density of 1.26, and water is a polar solvent with a density of 1.

0. After the two are mixed with the crude oil, they become an emulsion with increased density, stronger adsorption force, and stronger ability to wash colloids. After that, they are separated by a butterfly centrifuge with a large centrifugal force and sufficient separation. The clean oil is then dried, and the separated wastewater is treated for sewage; 3) The oil residue is homogenized by heating, and ionization occurs when boiling at 90 degrees. At this time, the separation effect is good. After three-phase separation, crude oil, wastewater and solid residue are obtained from top to bottom. The crude oil is treated again through step 2), and the wastewater is treated as sewage; A treatment device based on the above-mentioned method for purifying waste cooking oil comprises a treatment chamber, wherein a crude oil inlet and a waste glycerin inlet are respectively arranged at the top of the treatment chamber, and a waste glycerin outlet is arranged at the bottom of the treatment chamber, and the waste glycerin outlet is connected to a high-pressure pump outside the treatment chamber, and the high-pressure pump enters the treatment chamber through an input pipe, and a nozzle is arranged at the end of the input pipe inside the treatment chamber; a cylindrical partition is arranged inside the treatment chamber, and the top and bottom of the partition are both in an open state, wherein an arc-shaped cover plate is arranged above the opening of the top of the partition, and a nozzle is arranged at the opening of the bottom of the partition.

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