Method for efficiently extracting oil from palm oil production wastewater

Abstract

The invention discloses a method for efficiently extracting oil from palm oil production wastewater, and belongs to the technical field of grease extraction.In the method, the step of wastewater tempering is added before three-phase centrifugation, so that grease character transformation is achieved, and most grease in the wastewater can be extracted through centrifugal separation; meanwhile, preliminary separation of an oil-water layer is realized, a low-oil-content water phase is discharged in advance, grease is continuously enriched, a layer of oil-rich wastewater is formed on the surface, and a material state suitable for three-phase separation is achieved. Compared with the traditional common method, the method provided by the invention can obviously improve the oil extraction rate, and the centrifugal machine only needs to treat the oil-rich wastewater on the surface layer after enrichment, so that the amount of water needing to be treated is greatly reduced, and the operation and maintenance cost is reduced. The steam required in the whole process is waste gas which is discharged on site and is not used, the use amount of the special conditioning agent is small, and the operation cost of the agent and the aeration machine is far lower than the newly increased grease profit.

Description

Technical Field

[0001] The invention belongs to the technical field of oil extraction, and in particular relates to a method for efficiently extracting oil from palm oil production wastewater. Background Art

[0002] At present, the most commonly used production process in palm oil processing plants around the world is still the traditional production process, which produces a large amount of palm oil production wastewater every day, accounting for about 70% to 80% of the amount of fresh fruit processed. Palm oil production wastewater mainly includes: 1. Oil-water mixture at the bottom of gravity oil separation; 2. Production condensate, pressing water, flushing water, etc. These production wastewaters contain oil to varying degrees. The traditional method widely used for these oils is to place them in wastewater ponds to allow them to naturally stratify, and then manually scoop them out. This method takes a long time to stratify and has low efficiency in manual scooping. At the same time, due to the chemical properties of the oil itself, such as emulsification, the difficulty of oil stratification is aggravated, making it difficult to effectively recover most of the oil in palm oil production wastewater. Depending on the production process and production management, the oil content of the final drainage fluctuates between 0.8% and 1.5%, causing great losses. In response to this situation, the commonly used improvement measures currently include oil separator technology and centrifuge technology. The principle of the oil separator is to use the density difference between oil droplets and water to remove floating oil substances in oily wastewater. Its structure mostly adopts horizontal flow and inclined plate oil separators. The oily wastewater enters the rectangular oil separator through the water distribution tank and flows slowly in the horizontal direction. During the flow, the oil floats to the water surface due to its relatively small density, and is pushed into the oil collecting pipe by the oil collecting pipe or the oil scraper installed on the surface of the tank, and flows into the dewatering tank. The precipitated heavy oil and other impurities accumulate in the sludge bucket at the bottom of the tank and are discharged through the sludge discharge pipe.

[0003] However, the grease trap technology can only recover free grease, and emulsified oil and other states cannot be collected. Therefore, the wastewater treated with grease trap will overflow into the drainage channel for subsequent treatment to remove emulsified oil and other pollutants. In addition to the incomplete extraction of grease, the grease trap also has the disadvantages of large floor space for horizontal flow type and easy clogging of inclined plate type. At the same time, the existing technology mainly focuses on the extraction of oil from oily wastewater from kitchen waste, and cannot solve the problem of recovering emulsified oil in oily wastewater. Summary of the invention

[0004] The object of the present invention is to provide a method for efficiently extracting oil from palm oil production wastewater in order to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: a method for efficiently extracting oil from palm oil production wastewater, comprising the following steps:

[0006] S1: Collect wastewater, using the existing pools on site to collect wastewater generated during palm oil production, including oil-water mixture at the bottom of gravity oil separation, production condensate, pressing water, and flushing water;

[0007] S2: Store enough special conditioning agents in the agent dosing device. Determine the dosage of the agent through a small test, and add the special conditioning agent according to the dosage ratio based on the actual wastewater treatment volume. Use a pipeline mixer to fully mix the agent with the production wastewater collected in the collection tank;

[0008] S3: Perform triple-effect conditioning, and let the mixed wastewater and reagents enter the conditioning reactor. Stay in the conditioning reactor for a period of time, and keep the temperature in the reactor above 50°C by introducing the steam discharged from the palm oil factory on site. At the same time, turn on the aeration device inside the reactor to achieve flotation. The oil and fat part after the reaction is enriched upward due to the principle of low density, forming surface oil-rich wastewater. The water phase with less oil in the conditioning reactor gathers downward and is finally discharged from the bottom of the cone;

[0009] S4: Perform three-phase separation, and pump the surface oil-rich wastewater produced after three-effect conditioning and enrichment to a three-phase centrifuge. The three-phase separation can be achieved by centrifugation at a relatively low speed to separate the grease, water phase and solid phase. The solid phase is discharged from the slag discharge port of the three-phase centrifuge, and the oil phase and water phase are discharged separately. The oil phase is collected and aggregated to achieve the purpose of oil extraction from wastewater;

[0010] S5: Through small-scale experiments and combined with on-site conditions, determine the dosage of reagents, reaction temperature, residence time, gas-water ratio and other parameters to achieve the best oil extraction effect;

[0011] S6: Monitor the entire oil extraction process, including reagent dosage, reactor temperature, residence time, gas-water ratio, centrifuge speed and other parameters. Adjust parameters in time to ensure stable oil extraction effect;

[0012] S7: Regularly maintain the oil extraction equipment, including cleaning and maintenance, to ensure the normal operation of the equipment. S8: Optimize operating parameters to reduce the operating costs of reagents and aerators. Use the waste gas discharged on site as a steam source to further reduce costs;

[0013] S9: Regularly evaluate the economic benefits of oil extraction, including oil recovery, cost, profit, etc. Based on the evaluation results, continuously optimize the oil extraction process to improve economic benefits.

[0014] In a preferred embodiment, in step S1, in order to prevent grease stratification, the collection tank should also be provided with a stirring device to ensure that the grease in the wastewater can be evenly distributed. The stirring speed should be controlled at 30-50 rpm to ensure that the grease in the wastewater is fully mixed with water.

[0015] In a preferred embodiment, in step S2, the dosage is continuously added by a metering pump to ensure that the dosage of the agent is accurate and stable. The mixing method uses a pipeline mixer for full mixing, and the mixing time is accurate to seconds to ensure that the agent and the wastewater can fully contact. If the wastewater treatment capacity is 100 tons / hour, the dosage of the agent should be controlled between 50-200ppm. The mixing time should be controlled between 30 and 60 seconds to ensure that the agent and the wastewater are fully mixed.

[0016] In a preferred embodiment, in the step S3, the temperature in the tempering reactor needs to be maintained between 50°C and 80°C, and is heated by introducing steam discharged from the on-site palm oil factory production. The residence time needs to be determined according to the wastewater treatment volume and the reaction temperature, which is 1-2 hours. The height-to-diameter ratio needs to be determined according to the reactor volume and the wastewater treatment volume, which is 1:3-1:5. The gas-water ratio needs to be adjusted by an aeration device, which is 5:1-10:1. The flotation state needs to be adjusted by adjusting the aeration device so that the wastewater is in a slightly tumbling state, which is conducive to the floating of oil and fat. If the wastewater treatment volume is 100 tons / hour, the reaction temperature should be controlled at 70°C, the residence time should be controlled at 2 hours, the height-to-diameter ratio should be controlled at 1:4, and the gas-water ratio should be controlled at 7:1.

[0017] In a preferred embodiment, in step S4, the centrifugal speed needs to be determined according to the wastewater treatment capacity and the centrifuge type, which is 2000-3000 rpm. The residence time needs to be determined according to the centrifuge speed and the wastewater treatment capacity, which is 20-30 seconds. The separation effect needs to achieve good separation of grease, water phase and solid phase, and the grease recovery rate can reach more than 80%. If the wastewater treatment capacity is 100 tons / hour, the centrifugal speed should be controlled at 3000 rpm, the residence time should be controlled at 30 seconds, the separation effect should achieve good separation of grease, water phase and solid phase, and the grease recovery rate can reach more than 80%.

[0018] In a preferred embodiment, in step S5, the best oil extraction effect is achieved by adjusting parameters such as reaction temperature, residence time and gas-water ratio. If the oil recovery rate is low, the dosage of the reagent can be increased or the residence time can be extended to improve the oil recovery rate. In addition, the flotation state can be controlled by adjusting the gas-water ratio, and the gas-water ratio can be adjusted from 5:1 to 7:1 to improve the flotation effect of oil.

[0019] In a preferred embodiment, in step S6, if it is found that the dosage of the reagent is insufficient, the dosage of the metering pump can be adjusted in time to ensure that the dosage of the reagent is stable. If it is found that the reaction temperature is low, the amount of steam introduced can be adjusted in time to ensure that the reaction temperature is stable. In addition, the centrifuge speed can be monitored to ensure that it operates within the optimal range to improve the grease separation efficiency.

[0020] In a preferred embodiment, in step S7, the operating state of the stirring device is regularly checked to ensure that the stirring speed is stable. The operating state of the centrifuge can be regularly checked to ensure that the centrifuge speed is stable. In addition, the stirring blades of the stirring device and the filter screen of the centrifuge need to be regularly replaced to ensure the operating efficiency of the equipment.

[0021] In a preferred embodiment, in step S8, according to experimental results, the dosage of the reagent is reduced from 100ppm to 50ppm, which can reduce the reagent cost by 20%. At the same time, the waste gas discharged from the site can also be used as a steam source to further reduce costs. If the temperature of the waste gas discharged from the site is 100°C, it can be used to heat the quenching and tempering reactor, saving 30% of steam consumption.

[0022] In a preferred embodiment, in step S9, data such as the amount of oil recovered, cost, and profit can be calculated regularly, and according to the evaluation results, parameters such as the dosage of reagents, reaction temperature, residence time, and gas-water ratio can be adjusted to improve economic benefits. According to experimental data, the oil recovery rate increased from 50% to 80%, and the profit rate increased by 30%. In addition, the influence of different parameters on economic benefits can be analyzed, and the influence of parameters such as the dosage of reagents, reaction temperature, residence time, and gas-water ratio on the oil recovery rate and cost can be analyzed to determine the best operating parameters.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] In the present invention, by adding a wastewater conditioning step before three-phase centrifugation, the oil property transformation is achieved, so that most of the oil in the wastewater can be extracted by centrifugal separation; at the same time, the oil and water layers are initially separated, the low oil content water phase is discharged in advance, and the oil is continuously enriched to form a layer of oil-rich wastewater on the surface, reaching a material state suitable for three-phase separation. Compared with the traditional commonly used methods, the method provided by the present invention can significantly improve the oil extraction rate, and after enrichment, the centrifuge only needs to process the surface oil-rich wastewater, the amount of water to be processed is greatly reduced, and the operation and maintenance costs are reduced. The steam required in the whole process is the waste gas that is not used to be discharged on site, the amount of special conditioning agents used is small, and the operating costs of agents and aerators are much lower than the newly added oil profits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the process principle of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Reference Figure 1 ,

[0028] Example:

[0029] A method for efficiently extracting oil from palm oil production wastewater, comprising the following steps:

[0030] S1: Collect wastewater, using the existing pools on site to collect wastewater generated during palm oil production, including oil-water mixture at the bottom of gravity oil separation, production condensate, pressing water, and flushing water;

[0031] S2: Store enough special conditioning agents in the agent dosing device. Determine the dosage of the agent through a small test, and add the special conditioning agent according to the dosage ratio based on the actual wastewater treatment volume. Use a pipeline mixer to fully mix the agent with the production wastewater collected in the collection tank;

[0032] S3: Perform triple-effect conditioning, and let the mixed wastewater and reagents enter the conditioning reactor. Stay in the conditioning reactor for a period of time, and keep the temperature in the reactor above 50°C by introducing the steam discharged from the palm oil factory on site. At the same time, turn on the aeration device inside the reactor to achieve flotation. The oil and fat part after the reaction is enriched upward due to the principle of low density, forming surface oil-rich wastewater. The water phase with less oil in the conditioning reactor gathers downward and is finally discharged from the bottom of the cone;

[0033] S4: Perform three-phase separation, and pump the surface oil-rich wastewater produced after three-effect conditioning and enrichment to a three-phase centrifuge. The three-phase separation can be achieved by centrifugation at a relatively low speed to separate the grease, water phase and solid phase. The solid phase is discharged from the slag discharge port of the three-phase centrifuge, and the oil phase and water phase are discharged separately. The oil phase is collected and aggregated to achieve the purpose of oil extraction from wastewater;

[0034] S5: Through small-scale experiments and combined with on-site conditions, determine the dosage of reagents, reaction temperature, residence time, gas-water ratio and other parameters to achieve the best oil extraction effect;

[0035] S6: Monitor the entire oil extraction process, including reagent dosage, reactor temperature, residence time, gas-water ratio, centrifuge speed and other parameters. Adjust parameters in time to ensure stable oil extraction effect;

[0036] S7: Regularly maintain the oil extraction equipment, including cleaning and maintenance, to ensure the normal operation of the equipment. S8: Optimize operating parameters to reduce the operating costs of reagents and aerators. Use the waste gas discharged on site as a steam source to further reduce costs;

[0037] S9: Regularly evaluate the economic benefits of oil extraction, including oil recovery, cost, profit, etc. Based on the evaluation results, continuously optimize the oil extraction process to improve economic benefits.

[0038] In step S1, in order to prevent grease from stratifying, the collection tank should also be provided with a stirring device to ensure that the grease in the wastewater can be evenly distributed. The stirring speed should be controlled at 30-50 rpm to ensure that the grease in the wastewater is fully mixed with water.

[0039] In step S2, the dosage method adopts a metering pump for continuous dosage to ensure that the dosage of the agent is accurate and stable. The mixing method adopts a pipeline mixer for full mixing, and the mixing time is accurate to seconds to ensure that the agent and the wastewater can fully contact. If the wastewater treatment capacity is 100 tons / hour, the dosage of the agent should be controlled between 50-200ppm. The mixing time should be controlled between 30 and 60 seconds to ensure that the agent and the wastewater are fully mixed.

[0040] In step S3, the temperature in the tempering reactor needs to be maintained between 50°C and 80°C, and is heated by introducing steam discharged from the on-site palm oil mill production. The residence time needs to be determined according to the wastewater treatment volume and the reaction temperature, which is 1-2 hours. The height-to-diameter ratio needs to be determined according to the reactor volume and the wastewater treatment volume, which is 1:3-1:5. The gas-water ratio needs to be adjusted by an aeration device, which is 5:1-10:1. The flotation state needs to be adjusted by adjusting the aeration device so that the wastewater is in a slightly tumbling state, which is conducive to the floating of oil and fat. If the wastewater treatment volume is 100 tons / hour, the reaction temperature should be controlled at 70°C, the residence time should be controlled at 2 hours, the height-to-diameter ratio should be controlled at 1:4, and the gas-water ratio should be controlled at 7:1.

[0041] In step S4, the centrifugal speed needs to be determined according to the wastewater treatment capacity and the centrifuge type, which is 2000-3000 rpm. The residence time needs to be determined according to the centrifuge speed and the wastewater treatment capacity, which is 20-30 seconds. The separation effect needs to achieve good separation of grease, water phase and solid phase, and the grease recovery rate can reach more than 80%. If the wastewater treatment capacity is 100 tons / hour, the centrifugal speed should be controlled at 3000 rpm, the residence time should be controlled at 30 seconds, the separation effect should achieve good separation of grease, water phase and solid phase, and the grease recovery rate can reach more than 80%.

[0042] In step S5, the best oil extraction effect is achieved by adjusting the reaction temperature, residence time and gas-water ratio. If the oil recovery rate is low, the dosage of the reagent can be increased or the residence time can be extended to improve the oil recovery rate. In addition, the flotation state can be controlled by adjusting the gas-water ratio, and the gas-water ratio can be adjusted from 5:1 to 7:1 to improve the flotation effect of oil.

[0043] In step S6, if it is found that the dosage of the reagent is insufficient, the dosage of the metering pump can be adjusted in time to ensure that the dosage of the reagent is stable. If it is found that the reaction temperature is low, the amount of steam introduced can be adjusted in time to ensure that the reaction temperature is stable. In addition, the centrifuge speed can be monitored to ensure that it operates within the optimal range to improve the grease separation efficiency.

[0044] In step S7, the operating state of the stirring device is checked regularly to ensure that the stirring speed is stable. The operating state of the centrifuge can be checked regularly to ensure that the centrifuge speed is stable. In addition, the stirring blades of the stirring device and the filter screen of the centrifuge need to be replaced regularly to ensure the operating efficiency of the equipment.

[0045] In step S8, according to the experimental results, the dosage of the reagent is reduced from 100ppm to 50ppm, which can reduce the reagent cost by 20%. At the same time, the waste gas discharged from the site can also be used as a steam source to further reduce costs. If the temperature of the waste gas discharged from the site is 100°C, it can be used to heat the quenching and tempering reactor, saving 30% of steam consumption.

[0046] In step S9, data such as oil recovery, cost, and profit can be calculated regularly, and based on the evaluation results, parameters such as reagent dosage, reaction temperature, residence time, and gas-water ratio can be adjusted to improve economic benefits. According to experimental data, the oil recovery rate increased from 50% to 80%, and the profit margin increased by 30%. In addition, the optimal operating parameters can be determined by analyzing the impact of different parameters on economic benefits and the impact of parameters such as reagent dosage, reaction temperature, residence time, and gas-water ratio on oil recovery rate and cost.

[0047] The above process was used to treat the production wastewater of a palm oil factory in Malaysia, and the oil content of the raw water was about 1.66%. The reaction conditions of the triple-effect conditioning were determined by experiments, with a design temperature of 70°C, a residence time of 2 hours, a height-to-diameter ratio of 1:3, and a gas-water ratio of 7:1; the influent stayed for 30 seconds during the centrifugal process, and the centrifugal speed was 3000 rpm. During the pilot test, several different dosages were tried, and the final experimental results are shown in the following table:

[0048]

[0049]

[0050] This embodiment uses the process proposed by the present invention, and the obtained data proves that the oil content in the discharged oil-lean wastewater can be significantly reduced by three-phase centrifugation after three-effect conditioning, and the oil yield can be increased to 77.36% to 81.6%; while in the blank test conducted simultaneously, the oil yield of the traditional method was only 27.65%, while the oil yield of the direct centrifugal separation without three-effect conditioning was 50.24%, which is much lower than the effect of the combination of three-effect conditioning and three-phase centrifugation, proving that the three-effect conditioning technology is effective and feasible.

[0051] From the above, it can be known that: in the present invention, by adding a step of tempering the wastewater before three-phase centrifugation, the transformation of oil properties is achieved, so that most of the oil in the wastewater can be extracted by centrifugal separation; at the same time, the initial separation of the oil and water layer is achieved, the low-oil content water phase is discharged in advance, and the oil is continuously enriched to form a layer of oil-rich wastewater on the surface, reaching a material state suitable for three-phase separation. Compared with the traditional commonly used methods, the method provided by the present invention can significantly improve the oil extraction rate, and after enrichment, the centrifuge only needs to process the surface oil-rich wastewater, and the amount of water that needs to be processed is greatly reduced, reducing the operation and maintenance costs. The steam required in the whole process is the waste gas that is not used to be discharged on site, and the amount of special tempering agents is small. The operating costs of agents and aerators are much lower than the newly added oil profits.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for efficiently extracting oil from palm oil production wastewater, characterized in that: The steps include: S1: Collect wastewater, using the existing pools on site to collect wastewater generated during palm oil production, including oil-water mixture at the bottom of gravity oil separation, production condensate, pressing water, and flushing water; S2: storing enough special conditioning agents in the agent dosing device; determining the agent dosage through small-scale experiments, and adding the special conditioning agents according to the dosage ratio based on the actual wastewater treatment volume; fully mixing the agents with the production wastewater collected in the collection tank through the pipeline mixer; S3: Perform triple-effect conditioning, and let the mixed wastewater and reagents enter the conditioning reactor; stay in the conditioning reactor for a period of time, and keep the temperature in the reactor above 50°C by introducing the steam discharged from the palm oil factory on site; at the same time, turn on the aeration device inside the reactor to achieve air flotation; the oil and fat part after the reaction is enriched upward due to the principle of low density to form surface oil-rich wastewater; the water phase with less oil in the conditioning reactor gathers downward and is finally discharged from the bottom of the cone; S4: Perform three-phase separation, pump the surface oil-rich wastewater generated after three-effect conditioning and enrichment to a three-phase centrifuge; centrifuge at a relatively low speed to achieve three-phase separation, and separate the grease, water phase and solid phase; the solid phase is discharged from the slag discharge port of the three-phase centrifuge, and the oil phase and water phase are discharged separately; the oil phase is collected and aggregated to achieve the purpose of oil extraction from wastewater; S5: Through small-scale experiments and combined with on-site conditions, determine the dosage of reagents, reaction temperature, residence time, and gas-water ratio parameters to achieve the best oil extraction effect; S6: Monitor the entire oil extraction process, including reagent dosage, reactor temperature, residence time, gas-water ratio, centrifuge speed parameters; adjust parameters in time to ensure stable oil extraction effect; S7: Regularly maintain the oil extraction equipment, including cleaning and maintenance, to ensure the normal operation of the equipment; S8: Optimize operating parameters, reduce the operating costs of reagents and aerators, and further reduce costs; S9: Regularly evaluate the economic benefits of oil extraction, continuously optimize the oil extraction process, and improve economic benefits.

2. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S1, in order to prevent grease from stratifying, the collection tank should also be provided with a stirring device to ensure that the grease in the wastewater can be evenly distributed; the stirring speed is controlled at 30-50 rpm to ensure that the grease in the wastewater is fully mixed with water.

3. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S2, a metering pump is used for continuous addition to ensure that the dosage of the agent is accurate and stable; a pipeline mixer is used for sufficient mixing, and the mixing time is accurate to seconds to ensure that the agent and the wastewater can fully contact each other.

4. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S3, the temperature in the conditioning reactor is maintained between 50°C and 80°C, and is heated by introducing steam discharged from the on-site palm oil factory; the residence time is 1-2 hours; the height-to-diameter ratio is 1:3-1:5; the air-water ratio is 5:1-10:1; and the flotation state causes the wastewater to be in a slightly tumbling state.

5. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S4, the centrifugal speed is 2000-3000 rpm; the residence time needs to be determined according to the centrifuge speed and the wastewater treatment volume, which is 20 to 30 seconds; the separation effect needs to achieve good separation of grease, water phase and solid phase, and the grease recovery rate can reach more than 80%.

6. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S5, the air flotation state is controlled by adjusting the air-water ratio, and the air-water ratio is adjusted from 5:1 to 7:1 to improve the flotation effect of oil and fat.

7. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S6, the rotation speed of the centrifuge is monitored to ensure that it operates within an optimal range to improve the oil separation efficiency.

8. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In the step S7, the operating state of the stirring device is regularly checked to ensure that the stirring speed is stable; the operating state of the centrifuge is regularly checked to ensure that the speed of the centrifuge is stable.

9. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S8, the waste gas that is not used on site is used as a steam source to further reduce costs.

10. The method for efficiently extracting oil from palm oil production wastewater as claimed in claim 1, characterized in that: In step S9, the oil recovery amount, cost, and profit data are calculated regularly, and according to the evaluation results, the reagent dosage, reaction temperature, residence time, and gas-water ratio parameters are adjusted to improve economic benefits.

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