Resource recycling treatment method for waste hotpot soup

Abstract

The invention relates to a resource recycling treatment method of waste hotpot cooking liquor, which comprises the following steps: S1, solid-liquid separation: carrying out solid-liquid separation on the waste hotpot cooking liquor to separate out solid residues; s2, centrifugal separation: performing centrifugal separation on the soup separated in the S1 to obtain grease and wastewater; s3, recovery treatment: performing secondary filtration on the grease separated in S2; and S2, performing aerobic biochemical treatment on the wastewater separated in S2, and performing composting treatment on sludge obtained by the aerobic biochemical treatment. Compared with the prior art, the treatment method disclosed by the invention has the advantages that effective treatment and resource utilization of the waste hotpot soup are realized, and pollution to the environment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of food processing, and in particular relates to a resource recovery and processing method for waste hot pot soup. Background Art

[0002] Hot pot is a popular dining method, and the treatment of its pot bottom often becomes a major problem after the meal. The waste hot pot soup contains a lot of grease and solid residues, which mainly come from the hot pot soup base and the food residues eaten by customers. If the waste hot pot soup is directly flushed into the sewer without treatment, it is very easy to adhere to the inner wall of the sewer pipe, and long-term accumulation may cause sewer blockage. Therefore, it is necessary to carry out subsequent treatment of the waste hot pot soup.

[0003] However, the existing method for treating waste hot pot soup only adopts a simple solid-liquid separation method, separating the soup and solid residue and discarding them separately. This separation operation often causes serious environmental pollution and waste of resources.

[0004] Therefore, it is urgent to develop an environmentally friendly and efficient method for treating waste hot pot soup to achieve the recycling of effective resources in the waste hot pot soup. Summary of the invention

[0005] The purpose of the present invention is to provide a method for recycling and treating waste hot pot soup in order to overcome the defect of the prior art that it is difficult to realize resource utilization of waste hot pot soup.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a method for recycling and treating waste hot pot soup, comprising the following steps:

[0008] S1. Solid-liquid separation:

[0009] Carry out solid-liquid separation on the waste hot pot soup to separate the solid residue;

[0010] S2. Centrifugal separation:

[0011] The separated soup in S1 is centrifuged to separate oil and waste water;

[0012] S3: Recycling:

[0013] Perform secondary filtration on the oil separated from S2;

[0014] The wastewater separated from S2 is subjected to aerobic biochemical treatment, and the sludge obtained from the aerobic biochemical treatment is subjected to composting treatment.

[0015] Furthermore, in step S1, the solid-liquid separation uses a filter with a mesh size of 4-30.

[0016] Furthermore, in step S2, the centrifugal force of the centrifugal separation is 2000-6000×g, and the temperature of the centrifugal separation is 15-25°C.

[0017] Furthermore, in step S2, the centrifugal separation time is 3-10 minutes, and the number of centrifugal separations is 1-5 times.

[0018] Furthermore, in step S3, the first stage filtration in the two-stage filtration uses a filter bag with a precision of 200 μm, and the second stage filtration uses a filter bag with a precision of 50 μm.

[0019] Furthermore, the interface material of the filter bag includes any one of polypropylene, polyester or stainless steel.

[0020] Furthermore, the filter bag is made by sewing or hot melting process.

[0021] Furthermore, the filtered oil and fat is downgraded for use, such as as a biodiesel raw material, industrial oil or other non-food purposes.

[0022] Furthermore, in step S3, the specific steps of the aerobic biochemical treatment are: adding the separated wastewater into an aerobic biochemical pool, introducing oxygen and sludge, and performing aerobic treatment at 20-37°C using aerobic microorganisms in the sludge.

[0023] Furthermore, the hydraulic retention time (HRT) of the wastewater is 8-12 hours to ensure that organic matter is fully degraded.

[0024] Furthermore, the sludge load is controlled at 0.2-0.5 kgBOD5 / kgMLSS·d to maintain the activity and treatment efficiency of the activated sludge.

[0025] Furthermore, the sludge age is 15-30 days to maintain the stability and treatment effect of the sludge.

[0026] Furthermore, in step S3, the specific steps of the composting treatment are: dehydrating the sludge obtained by aerobic biochemical treatment, controlling the carbon-nitrogen ratio and pH ratio in the sludge, composting at 55-65° C., and finally converting it into organic fertilizer for farming. The appropriate temperature is maintained throughout the composting process to ensure the inactivation of pathogens and weed seeds.

[0027] Furthermore, ventilation is required during the composting process to provide oxygen, promote the growth of aerobic microorganisms, and accelerate the composting process.

[0028] Furthermore, the moisture content of the dehydrated sludge is 70-85%, and the dehydration is carried out by mechanical dehydration methods such as filter pressing, centrifugation, etc.

[0029] Furthermore, the carbon-nitrogen ratio is controlled at (25-40):1. Controlling the appropriate carbon-nitrogen ratio promotes microbial activity and the decomposition of organic matter.

[0030] Furthermore, the pH is controlled at 6.5-7.5 to maintain microbial activity.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The present invention realizes the effective treatment and resource recovery of hot pot waste soup through the steps of solid-liquid separation, oil separation, multi-stage oil filtration treatment, aerobic biochemical treatment, etc., and realizes the resource utilization of hot pot waste soup.

[0033] (2) The solid residue obtained by solid-liquid separation of the present invention can be used for composting or incineration to generate electricity, the oil obtained by oil separation can be used as a biodiesel raw material, industrial oil or other non-food purposes, and the separated wastewater can be subjected to aerobic biochemical treatment and composting treatment to finally obtain organic fertilizer, thereby finally realizing the classified resource utilization of hot pot waste soup.

[0034] (3) The present invention realizes the effective separation and recycling of wastewater from grease and solid residues in the waste hot pot soup, reducing the pollution and damage to the environment caused by direct disposal. It is an environmentally friendly treatment method that takes into account both environmental protection and resource recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the process of the resource recovery and treatment method of the present invention. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0037] Unless otherwise specified, the reagents, methods, instruments and equipment used in the present invention are conventional reagents, methods, instruments and equipment in the art. Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0038] The present invention provides a method for recycling and treating waste hot pot soup, comprising the following steps:

[0039] S1. Solid-liquid separation: The waste hot pot soup is separated into solid and liquid to separate the solid residue. The solid-liquid separation uses a filter with a mesh size of 4-30. The separated solid residue is composted or incinerated to generate electricity.

[0040] S2, centrifugal separation: centrifugal separation is performed on the soup separated in S1 to separate the oil and waste water; the centrifugal force of the centrifugal separation is 2000-6000×g, the temperature of the centrifugal separation is 15-25° C. The centrifugal separation time is 3-10 minutes, and the number of centrifugal separations is 1-5 times.

[0041] S3: Recycling: The oil separated from S2 is subjected to secondary filtration. The first stage of the secondary filtration uses a filter bag with a precision of 200μm, and the second stage uses a filter bag with a precision of 50μm. The interface material of the filter bag includes any one of polypropylene, polyester or stainless steel, and the filter bag is made by sewing or hot melting process.

[0042] The wastewater separated from S2 is subjected to aerobic biochemical treatment, and the sludge obtained by the aerobic biochemical treatment is subjected to composting treatment. The specific steps of aerobic biochemical treatment are: adding the separated wastewater to a stirrer, introducing oxygen and sludge, and using aerobic microorganisms in the sludge to perform aerobic treatment at 20-37°C. Among them, the hydraulic retention time of the wastewater is 8-12h, the load of the sludge is controlled at 0.2-0.5kgBOD5 / kgMLSS·d, and the sludge age is 15-30 days. The specific steps of composting treatment are: dehydrating the sludge obtained by aerobic biochemical treatment, controlling the carbon-nitrogen ratio and pH ratio in the sludge, and composting at 55-65°C. The moisture content of the dehydrated sludge is 70-85%, the carbon-nitrogen ratio is controlled at (25-40):1, and the pH is controlled at 6.5-7.5.

[0043] Embodiment 1:

[0044] This embodiment provides a method for recycling waste hot pot soup to illustrate the above specific implementation. The specific steps of the method are as follows:

[0045] (1) Pretreatment: Filter the hot pot waste soup through a 20-mesh sieve to remove large particles of solid residue.

[0046] (2) Oil separation: The filtered soup is centrifuged at 4100×g for 5 minutes to separate the oil. The centrifugal temperature is controlled at about 20°C.

[0047] (3) Grease filtration: In the first step, the separated grease is filtered through a 200-micron PE filter bag. In the second step, the grease filtered in the first step is filtered through a 50-micron PE filter bag. After two-stage filtration, the separated grease is downgraded for use, such as biodiesel raw material, industrial oil or other non-food purposes.

[0048] (4) Biochemical treatment: The separated wastewater is introduced into an aerobic biochemical tank equipped with a stirrer. The temperature is controlled at 30°C and oxygen is introduced. Aerobic biological treatment is carried out under the stirring of the stirrer. The hydraulic retention time is 10 hours.

[0049] (5) Resource recovery: Biochemical sludge is composted and converted into organic fertilizer for use in farming. The moisture content of the compost raw materials is controlled at about 80% and the C / N ratio is about 30:1 through mechanical dehydration methods such as filter pressing. Regular ventilation is carried out to maintain the compost temperature at about 60°C and the pH value between 6.5 and 7.5.

[0050] Embodiment 2:

[0051] This embodiment provides a method for recycling waste hot pot soup, and the specific steps are as follows:

[0052] (1) Pretreatment: Filter the hot pot waste soup through a 10-mesh sieve to remove large particles of solid residue.

[0053] (2) Oil separation: The filtered soup is centrifuged at 3000×g for 10 minutes to separate the oil and fat through three centrifugations. The centrifugation temperature is controlled at about 20°C.

[0054] (3) Grease filtration: In the first step, the separated grease is filtered through a 200-micron PE filter bag. In the second step, the grease filtered in the first step is filtered through a 50-micron PE filter bag. After two-stage filtration, the separated grease is downgraded for use, such as biodiesel raw material, industrial oil or other non-food purposes.

[0055] (4) Biochemical treatment: The separated wastewater is introduced into an aerobic biochemical tank equipped with a stirrer. The temperature is controlled at 37°C and oxygen is introduced. Aerobic biological treatment is carried out under the stirring of the stirrer. The hydraulic retention time is 8 hours.

[0056] (5) Resource recovery: Biochemical sludge is composted and converted into organic fertilizer for use in farming. The moisture content of the compost raw materials is controlled at about 70% and the C / N ratio is about 25:1 through mechanical dehydration methods such as centrifugation. Regular ventilation is carried out to maintain the compost temperature at about 60°C and the pH value between 6.5 and 7.5.

[0057] Embodiment 3:

[0058] This embodiment provides a method for recycling waste hot pot soup, and the specific steps are as follows:

[0059] (1) Pretreatment: Filter the hot pot waste soup through a 20-mesh sieve to remove large particles of solid residue.

[0060] (2) Oil separation: The filtered soup is centrifuged at 6000×g for 3 minutes to separate the oil and fat through two centrifugations. The centrifugation temperature is controlled at about 20°C.

[0061] (3) Grease filtration: In the first step, the separated grease is filtered through a 200-micron PE filter bag. In the second step, the grease filtered in the first step is filtered through a 50-micron PE filter bag. After two-stage filtration, the separated grease is downgraded for use, such as biodiesel raw material, industrial oil or other non-food purposes.

[0062] (4) Biochemical treatment: The separated wastewater is introduced into an aerobic biochemical tank equipped with a stirrer. The temperature is controlled at 30°C and oxygen is introduced. Aerobic biological treatment is carried out under the stirring of the stirrer. The hydraulic retention time is 12 hours.

[0063] (5) Resource recovery: Biochemical sludge is composted and converted into organic fertilizer for use in farming. The moisture content of the compost raw materials is controlled at about 85% and the C / N ratio is about 40:1 through mechanical dehydration methods such as filter pressing. Regular ventilation is carried out to maintain the compost temperature at about 60°C and the pH value between 6.5 and 7.5.

[0064] Comparative Example 1:

[0065] This comparative example provides a method for recycling and treating waste hot pot soup. The difference from Example 1 is that only the first stage separation is performed in the grease filtration process, and the second stage separation is not performed.

[0066] The present invention carries out the following tests on the above-mentioned embodiments and comparative examples:

[0067] (1) Grease separation performance test: refer to the relevant standards of GB / T 40133-2021 on the recovery rate of waste cooking oil. The recovery rate of waste cooking oil should be no less than 85%. The results of the grease separation performance test are shown in Table 1.

[0068] Table 1 Grease separation recovery test performance table

[0069] Oil separation recovery rate Example 1 95％ Example 2 93％ Example 3 92％ Comparative Example 1 81％

[0070] As can be seen from the above table, the secondary separation treatment of the waste hot pot soup by the present invention can increase the oil separation rate from 81% to 95%.

[0071] (2) Aerobic biochemical treatment effect: The five-day biochemical oxygen demand (BOD5) refers to the amount of dissolved oxygen consumed by aerobic microorganisms in the biochemical oxidation process of organic matter in water under the condition of dissolved oxygen. The determination dilution and inoculation method of BOD5 refers to HJ 505-2009. The relevant test results of BOD5 of Examples 1-3 are shown in Table 2.

[0072] Table 2 Aerobic biochemical treatment effect test results

[0073] BOD5 mg / L Example 1 13.5％ Example 2 14.1％ Example 3 15.0％

[0074] As can be seen from the above table, the wastewater obtained after oil filtration treatment of the discarded hot pot soup is subjected to aerobic biochemical treatment, and the final five-day biochemical oxygen demand measured is ≤15 mg / L, indicating that the wastewater finally separated by the treatment method of the present invention has practical application value.

[0075] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for recycling waste hot pot soup, characterized in that: The following steps are involved: S1. Solid-liquid separation: Carry out solid-liquid separation on the waste hot pot soup to separate the solid residue; S2. Centrifugal separation: The separated soup in S1 is centrifuged to separate oil and waste water; S3: Recycling: Perform secondary filtration on the oil separated from S2; The wastewater separated from S2 is subjected to aerobic biochemical treatment, and the sludge obtained from the aerobic biochemical treatment is subjected to composting treatment.

2. The method for recycling waste hot pot soup according to claim 1, characterized in that: In step S1, the solid-liquid separation uses a filter with a mesh size of 4-30.

3. The method for recycling waste hot pot soup according to claim 1, characterized in that: In step S2, the centrifugal force of the centrifugal separation is 2000-6000×g, and the temperature of the centrifugal separation is 15-25°C.

4. The method for recycling waste hot pot soup according to claim 1, characterized in that: In step S2, the centrifugal separation time is 3-10 minutes, and the number of centrifugal separations is 1-5 times.

5. The method for recycling waste hot pot soup according to claim 1, characterized in that: In step S3, the first stage of filtration in the two-stage filtration uses a filter bag with a precision of 200 μm, and the second stage of filtration uses a filter bag with a precision of 50 μm.

6. The method for recycling waste hot pot soup according to claim 5, characterized in that: The interface material of the filter bag includes any one of polypropylene, polyester or stainless steel; The filter bag is made by sewing or hot melting.

7. The method for recycling waste hot pot soup according to claim 1, characterized in that: In step S3, the specific steps of the aerobic biochemical treatment are: The separated wastewater is added to the aerobic biochemical pool, oxygen and sludge are introduced, and aerobic treatment is carried out at 20-37°C using aerobic microorganisms in the sludge.

8. The method for recycling waste hot pot soup according to claim 7, characterized in that: The hydraulic retention time of the wastewater is 8-12 hours, the load of the sludge is controlled at 0.2-0.5 kgBOD5 / kgMLSS·d, and the sludge age is 15-30 days.

9. The method for recycling waste hot pot soup according to claim 1, characterized in that: In step S3, the specific steps of the composting process are: The sludge obtained by aerobic biochemical treatment is dehydrated, the carbon-nitrogen ratio and pH ratio in the sludge are controlled, and composting is carried out at 55-65°C.

10. The method for recycling waste hot pot soup according to claim 9, characterized in that: The moisture content of the dehydrated sludge is 70-85%, the carbon-nitrogen ratio is controlled at (25-40):1, and the pH is controlled at 6.5-7.5.

Images