Sewage purification treatment method for meat product processing

Abstract

The invention relates to the technical field of meat product processing, and discloses a sewage purification treatment method for meat product processing, which comprises the following steps: S1, pretreatment, S2, adjustment of water quality and water quantity, setting of an adjusting tank, adjustment of water quality and water quantity of sewage, realization of homogeneous and uniform treatment of sewage, and provision of buffer capability for organic load; s3, biological treatment, S4, advanced treatment, S5, sludge treatment and S6, monitoring and evaluation, the water quality and the water quantity of sewage in a regulating tank are balanced and regulated, stability is kept, growth and reproduction of microorganisms in the biological treatment stage are facilitated, and the sewage treatment efficiency is improved; after biological treatment, suspended solids, colloidal substances and microbial pollutants in the sewage are further removed through coagulating sedimentation, filtration and disinfection measures, and the effluent quality is improved; and the sludge generated in the sewage treatment process is subjected to resource utilization, so that the pollution to the environment is reduced to a great extent.

Description

Technical Field

[0001] The invention relates to the technical field of meat processing, in particular to wastewater purification treatment in meat processing, and specifically to a wastewater purification treatment method for meat processing. Background Art

[0002] Meat processing is a complex process involving multiple links, mainly including raw material procurement, slaughtering, cutting, processing, packaging and transportation.

[0003] The purpose of wastewater purification in meat processing is to remove harmful substances from wastewater generated during the processing through a series of treatment processes, so that the water quality meets the discharge standards or can be reused, and promote the sustainable development of the industry.

[0004] After searching, the patent with application number CN202211420109.1 discloses a wastewater treatment device for a meat processing workshop, which relates to the field of meat processing technology, including a sewage treatment tank main body, and the sewage treatment tank main body is a rectangular cavity structure, and the cavity of the sewage treatment tank main body is divided into a coagulation tank, a flocculation tank and a sedimentation tank. Through the expansion component, the lifting component and the first stirring impeller at the bottom, the sewage in the coagulation tank can be more fully stirred and mixed with the coagulant, which can greatly improve the reaction efficiency of the coagulant; through the lifting filter plate, the rotating filter plate and the filter mesh cylinder, the large particles of suspended matter in the sewage in the flocculation tank can be effectively removed, thereby improving the purification efficiency of the sewage, solving the problem that the single stirring form in the existing coagulation tank has poor mixing efficiency, reduces the utilization rate of the coagulant, and at the same time a large amount of large particles of suspended matter will float in the sewage, which is easy to be discharged through the clean water pipe, affecting the quality of clean water.

[0005] The current treatment method for wastewater generated by meat processing is not very effective for wastewater treatment, and the treatment process needs to be further improved. Specifically, when treating wastewater from meat processing, changes in water quality and quantity will lead to unstable wastewater treatment effects, which in turn will cause the treated wastewater to still fail to meet emission standards; and the wastewater treatment process will produce a large amount of sludge, which contains a large amount of organic matter, heavy metals and other pollutants. If not handled properly, it may cause harm to the environment and human health. Therefore, we need to propose a wastewater purification treatment method for meat processing. Summary of the invention

[0006] The purpose of the present invention is to provide a method for purifying wastewater for meat processing, which can balance and regulate the water quality and water quantity of the wastewater in the regulating tank and maintain stability, thereby facilitating the growth and reproduction of microorganisms in the biological treatment stage and improving the wastewater treatment efficiency; and after the biological treatment, through coagulation sedimentation, filtration and disinfection measures, further remove suspended matter, colloidal substances and microbial pollutants in the wastewater and improve the effluent water quality; and utilize the sludge generated in the wastewater treatment process as a resource, thereby greatly reducing the pollution to the environment and solving the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a method for purifying wastewater for meat processing, comprising the following steps:

[0008] S1. Pretreatment: remove large suspended solids and impurities in sewage to create favorable conditions for subsequent treatment processes;

[0009] S2. Regulate water quality and quantity: Set up a regulating tank to regulate the water quality and quantity of sewage, achieve homogeneous and uniform sewage treatment, and provide buffering capacity for organic matter load;

[0010] S3. Biological treatment: using the metabolism of microorganisms to decompose organic matter in sewage into harmless substances;

[0011] S4. Advanced treatment: After biological treatment, the sewage is further removed by coagulation, sedimentation, filtration and disinfection to remove pollutants that are difficult to degrade and trace harmful substances;

[0012] S5. Sludge treatment: The sludge generated during the sewage treatment process is concentrated, dehydrated, digested and dried, and the treated sludge is utilized as a resource;

[0013] S6. Monitoring and evaluation: Real-time monitoring and regular evaluation of water quality, water quantity and sludge parameters in each link of the sewage treatment process to promptly identify and address problems.

[0014] Preferably, in step S1, the pretreatment of sewage includes the following process:

[0015] S11, coarse screen filtration: intercept large suspended particles in sewage, such as minced meat and bones, to prevent them from entering the subsequent treatment unit;

[0016] S12, fine screen filtration: further remove small suspended particles and floating objects in sewage;

[0017] S13. Grit Tank Sedimentation: The heavy matter such as mud and tiny particles in sewage are settled to the bottom of the grit tank by gravity.

[0018] Preferably, in step S2, adjusting the water quality and quantity includes:

[0019] Water volume regulation: monitor the water inflow in real time, record the water inflow data in different time periods, and set up a regulating pool for storing and regulating the water inflow, and adjust the load of the subsequent sewage treatment unit in real time according to the water inflow;

[0020] Water quality regulation: real-time monitoring of influent water quality indicators, analysis of water quality data, and adjustment of chemical agents to remove colloids and suspended solids, adjust the pH value of sewage, and also adjust the dissolved oxygen concentration and temperature parameters of sewage to optimize the growth environment of microorganisms.

[0021] Preferably, in step S3, the biological treatment adopts any one of aerobic biological treatment or anaerobic biological treatment;

[0022] Aerobic biological treatment: The sewage with adjusted water quality and quantity is passed into the aerobic tank, and activated sludge is added to the aerobic tank to degrade organic matter through the aerobic metabolism of microorganisms;

[0023] Anaerobic biological treatment: Under anaerobic conditions, anaerobic bacteria are used to decompose organic matter into methane and carbon dioxide gases.

[0024] Preferably, in step S4, the deep treatment of sewage includes the following process:

[0025] S41, coagulation and sedimentation: adding coagulants to sewage to condense fine suspended matter and colloidal substances into large particles;

[0026] S42, Filtration: The precipitated sewage is passed through quartz sand or activated carbon to remove suspended matter and colloidal substances;

[0027] S43. Disinfection: Add chlorine, chlorine dioxide or sodium hypochlorite disinfectants to sewage to kill pathogenic microorganisms and viruses.

[0028] Preferably, in step S5, the sludge treatment includes the following process:

[0029] S51. Sludge thickening: reducing sludge volume by gravity thickening or mechanical thickening;

[0030] S52, sludge dehydration: use plate and frame filter press or belt filter press equipment to further reduce the sludge moisture content;

[0031] S53, sludge digestion: using microorganisms to decompose organic matter in sludge into stable substances;

[0032] S54, sludge drying: the dehydrated sludge is further dried to reduce the sludge moisture content for subsequent disposal.

[0033] Preferably, the treatment of the sludge includes:

[0034] Landfilling can improve soil structure and fertility by utilizing the rich organic matter and nutrients in sewage sludge;

[0035] Preparation of building materials: The treated sludge is prepared into bricks or cement to achieve resource utilization.

[0036] Preferably, in step S6, the monitoring and evaluation of sewage includes the following process:

[0037] S61. Determine monitoring indicators: select the pH value, chemical oxygen demand, biochemical oxygen demand, suspended solids, and ammonia nitrogen parameters of the sewage to be monitored;

[0038] S62. Select monitoring locations: monitor the quality of incoming sewage at the water inlet, arrange monitoring equipment in the grit chamber, regulating tank, aerobic tank, and sedimentation tank, evaluate the treatment efficiency of each treatment process, and monitor the effluent quality at the water outlet;

[0039] S63. Use monitoring instruments to monitor the pH value, chemical oxygen demand, biochemical oxygen demand, suspended solids, and ammonia nitrogen parameters of the sewage online in real time;

[0040] S64. Record the monitored data, including monitoring time, monitoring location, and sewage parameter values, and analyze and evaluate the data.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention balances and stabilizes the water quality and quantity of sewage in the regulating tank, which is beneficial to the growth and reproduction of microorganisms in the biological treatment stage and improves the sewage treatment efficiency. After the biological treatment, the present invention further removes suspended matter, colloidal substances and microbial pollutants in the sewage through coagulation sedimentation, filtration and disinfection measures to improve the effluent water quality. The sludge generated in the sewage treatment process is recycled, which greatly reduces the pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flowchart of the present invention;

[0044] Figure 2 This is a flowchart of the sewage pretreatment process of the present invention;

[0045] Figure 3 It is a flowchart of the advanced treatment of sewage of the present invention;

[0046] Figure 4 It is a flowchart of the sludge treatment process of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figure 1-4 The present invention provides a technical solution: a method for purifying wastewater for meat processing, comprising the following steps:

[0049] S1. Pretreatment: remove large suspended solids and impurities in sewage to create favorable conditions for subsequent treatment processes;

[0050] In step S1, the pretreatment of sewage includes the following process:

[0051] S11, coarse screen filtration: intercept large suspended particles in sewage, including minced meat and bones, to prevent them from entering the subsequent treatment unit and affecting the normal operation of the equipment;

[0052] S12, fine screen filtration: further remove small suspended particles and floating objects in sewage; timely interception of suspended matter can prevent subsequent pipeline equipment from clogging.

[0053] S13, Grit Tank Sedimentation: Through gravity, the heavy materials such as silt and tiny particles in the sewage are settled to the bottom of the grit tank, further reducing the difficulty and cost of subsequent treatment. After pretreatment, the sewage water quality is more stable, which is conducive to the smooth progress of the subsequent biological treatment stage.

[0054] S2. Adjust water quality and quantity: Set up an adjusting tank to adjust the water quality and quantity of sewage, achieve homogeneous and uniform treatment of sewage, and provide buffering capacity for organic matter load; the adjusting tank generally has a large volume, can store and adjust a certain amount of sewage, and transport sewage to subsequent treatment units through a lifting pump. The flow rate and concentration can be adjusted according to actual needs to ensure the stable operation of the treatment system. A stirring device can be set in the adjusting tank to prevent sludge deposition.

[0055] In step S2, adjusting water quality and quantity includes:

[0056] Water volume regulation: monitor the water inflow in real time, record the water inflow data in different time periods, and set up a regulating pool for storing and regulating the water inflow, and adjust the load of the subsequent sewage treatment unit in real time according to the water inflow;

[0057] Water quality regulation: real-time monitoring of influent water quality indicators, analysis of water quality data, and adjustment of chemical agents to remove colloids and suspended solids, adjust the pH value of sewage, and also adjust the dissolved oxygen concentration and temperature parameters of sewage to optimize the growth environment of microorganisms.

[0058] Optionally, an intelligent control system can be introduced to automatically adjust the operating parameters of the regulating tank according to changes in water quality and quantity, and a multi-stage regulating tank can be set up to further improve the stability of water quality and quantity.

[0059] S3. Biological treatment: using the metabolism of microorganisms to decompose organic matter in sewage into harmless substances;

[0060] In step S3, the biological treatment adopts either aerobic biological treatment or anaerobic biological treatment;

[0061] Aerobic biological treatment: The sewage with adjusted water quality and quantity is passed into the aerobic tank, and activated sludge is added to the aerobic tank to degrade organic matter through the aerobic metabolism of microorganisms;

[0062] By adding activated sludge containing a large number of microorganisms into the aerobic pool, the organic pollutants in the sewage are decomposed into harmless substances such as carbon dioxide and water by the aerobic metabolism of the microorganisms. Air or oxygen needs to be added to the pool regularly to maintain the normal growth and metabolic activity of the microorganisms.

[0063] Aerobic biological treatment also includes biofilm method: in the biofilm reactor, microorganisms attach to the surface of the carrier to form a biofilm. When sewage flows through the biofilm, the organic pollutants in it are degraded by the microorganisms. The biofilm method has the advantages of small footprint and good treatment effect.

[0064] Anaerobic biological treatment: Under anaerobic conditions, anaerobic bacteria are used to decompose organic matter into methane and carbon dioxide gases.

[0065] Anaerobic digesters are often used in conjunction with aerobic treatment units to improve overall treatment effectiveness. The biogas produced during the anaerobic treatment process can be recycled and used as an energy source.

[0066] Optionally, high-efficiency biological strains are introduced to improve the degradation ability and impact resistance of microorganisms.

[0067] S4. Advanced treatment: After biological treatment, the sewage is further removed by coagulation, sedimentation, filtration and disinfection to remove pollutants that are difficult to degrade and trace harmful substances;

[0068] In step S4, the deep treatment of sewage includes the following process:

[0069] S41. Coagulation and sedimentation: Add coagulants to sewage to condense fine suspended matter and colloidal substances into large particles; the condensed large particles are removed through sedimentation tanks. Coagulation and sedimentation can effectively reduce the turbidity and color of sewage and improve the quality of effluent.

[0070] S42, Filtration: The precipitated sewage is passed through quartz sand or activated carbon to remove suspended matter and colloids; the adsorption and interception of quartz sand or activated carbon removes suspended matter and colloids in the sewage. During the filtration process, the filter material needs to be backwashed regularly to restore its adsorption capacity.

[0071] S43, Disinfection: Add chlorine, chlorine dioxide or sodium hypochlorite disinfectants to sewage to kill pathogenic microorganisms and viruses. The disinfection process requires strict control of the amount of disinfectant added and the contact time to ensure the disinfection effect and avoid the production of harmful by-products.

[0072] S5. Sludge treatment: The sludge generated during the sewage treatment process is concentrated, dehydrated, digested and dried, and the treated sludge is utilized as a resource;

[0073] In step S5, sludge treatment includes the following process:

[0074] S51. Sludge thickening: reducing sludge volume by gravity thickening or mechanical thickening;

[0075] S52, sludge dehydration: use plate and frame filter press or belt filter press equipment to further reduce the sludge moisture content;

[0076] S53, sludge digestion: using microorganisms to decompose organic matter in sludge into stable substances;

[0077] S54, sludge drying: the dehydrated sludge is further dried to reduce the sludge moisture content for subsequent disposal.

[0078] Removing moisture from sludge can reduce the transportation cost of sludge.

[0079] Disposal of treated sludge includes:

[0080] Landfilling can improve soil structure and fertility by utilizing the rich organic matter and nutrients in sewage sludge;

[0081] Preparation of building materials: The treated sludge is prepared into bricks or cement to achieve resource utilization.

[0082] In addition, sludge pyrolysis oil production technology can be introduced to convert sludge into oily substances for secondary utilization.

[0083] S6. Monitoring and evaluation: Real-time monitoring and regular evaluation of water quality, water quantity and sludge parameters in each link of the sewage treatment process to promptly identify and address problems.

[0084] In step S6, the monitoring and assessment of sewage includes the following process:

[0085] S61. Determine monitoring indicators: select the pH value, chemical oxygen demand (COD), biochemical oxygen demand (BOD), suspended solids (SS), and ammonia nitrogen (NH3-N) parameters of the sewage that need to be monitored; these indicators can comprehensively reflect the pollution degree and treatment effect of the sewage, and use photometry, spectrophotometry, ion chromatography and other analytical methods to accurately measure water quality indicators.

[0086] S62. Select monitoring locations: monitor the quality of incoming sewage at the water inlet, arrange monitoring equipment in grit chambers, regulating tanks, aerobic tanks, and sedimentation tanks, evaluate the treatment efficiency of each treatment process, and monitor the effluent quality at the outlet; regularly monitor the water quality of the inlet, outlet, and treatment process to ensure that the treatment effect meets the standards.

[0087] S63. Use monitoring instruments to monitor the pH value, chemical oxygen demand (COD), biochemical oxygen demand (BOD), suspended solids (SS), and ammonia nitrogen (NH3-N) parameters of sewage in real time online; introduce an online monitoring system to achieve real-time monitoring and data analysis of sewage and sludge treatment processes.

[0088] S64. Record the monitored data, including monitoring time, monitoring location, and sewage parameter values, and analyze and evaluate the data.

[0089] According to the monitoring results, the operation status of the sewage treatment system is evaluated, and the treatment process and parameters are adjusted in time to ensure that the treatment effect is stable and meets the standards. At the same time, a feedback mechanism is established to detect and solve problems in a timely manner.

[0090] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for purifying wastewater for meat processing, characterized in that: The following steps are involved: S1. Pretreatment: remove large suspended solids and impurities in sewage to create favorable conditions for subsequent treatment processes; S2. Regulate water quality and quantity: Set up a regulating tank to regulate the water quality and quantity of sewage, achieve homogeneous and uniform sewage treatment, and provide buffering capacity for organic matter load; S3. Biological treatment: using the metabolism of microorganisms to decompose organic matter in sewage into harmless substances; S4. Advanced treatment: After biological treatment, the sewage is further removed by coagulation, sedimentation, filtration and disinfection to remove pollutants that are difficult to degrade and trace harmful substances; S5. Sludge treatment: The sludge generated during the sewage treatment process is concentrated, dehydrated, digested and dried, and the treated sludge is utilized as a resource; S6. Monitoring and evaluation: Real-time monitoring and regular evaluation of water quality, water quantity and sludge parameters in each link of the sewage treatment process to promptly identify and address problems.

2. A method for purifying wastewater for meat processing according to claim 1, characterized in that: In step S1, the pretreatment of sewage includes the following process: S11, coarse screen filtration: intercept large suspended particles in sewage, such as minced meat and bones, to prevent them from entering the subsequent treatment unit; S12, fine screen filtration: further remove small suspended particles and floating objects in sewage; S13. Grit Tank Sedimentation: The heavy matter such as mud and tiny particles in sewage are settled to the bottom of the grit tank by gravity.

3. The method for purifying wastewater for meat processing according to claim 1, characterized in that: In step S2, adjusting water quality and quantity includes: Water volume regulation: monitor the water inflow in real time, record the water inflow data in different time periods, and set up a regulating pool for storing and regulating the water inflow, and adjust the load of the subsequent sewage treatment unit in real time according to the water inflow; Water quality regulation: real-time monitoring of influent water quality indicators, analysis of water quality data, and adjustment of chemical agents to remove colloids and suspended solids, adjust the pH value of sewage, and also adjust the dissolved oxygen concentration and temperature parameters of sewage to optimize the growth environment of microorganisms.

4. The method for purifying wastewater for meat processing according to claim 1, characterized in that: In step S3, the biological treatment adopts either aerobic biological treatment or anaerobic biological treatment; Aerobic biological treatment: The sewage with adjusted water quality and quantity is passed into the aerobic tank, and activated sludge is added to the aerobic tank to degrade organic matter through the aerobic metabolism of microorganisms; Anaerobic biological treatment: Under anaerobic conditions, anaerobic bacteria are used to decompose organic matter into methane and carbon dioxide gases.

5. The method for purifying wastewater for meat processing according to claim 1, characterized in that: In step S4, the deep treatment of sewage includes the following process: S41, coagulation and sedimentation: adding coagulants to sewage to condense fine suspended matter and colloidal substances into large particles; S42, Filtration: The precipitated sewage is passed through quartz sand or activated carbon to remove suspended matter and colloidal substances; S43. Disinfection: Add chlorine, chlorine dioxide or sodium hypochlorite disinfectants to sewage to kill pathogenic microorganisms and viruses.

6. The method for purifying wastewater for meat processing according to claim 1, characterized in that: In step S5, sludge treatment includes the following process: S51. Sludge thickening: reducing sludge volume by gravity thickening or mechanical thickening; S52, sludge dehydration: use plate and frame filter press or belt filter press equipment to further reduce the sludge moisture content; S53, sludge digestion: using microorganisms to decompose organic matter in sludge into stable substances; S54, sludge drying: the dehydrated sludge is further dried to reduce the sludge moisture content for subsequent disposal.

7. The method for purifying wastewater for meat processing according to claim 1, characterized in that: Disposal of treated sludge includes: Landfilling can improve soil structure and fertility by utilizing the rich organic matter and nutrients in sewage sludge; Preparation of building materials: The treated sludge is prepared into bricks or cement to achieve resource utilization.

8. The method for purifying wastewater for meat processing according to claim 1, characterized in that: In step S6, the monitoring and assessment of sewage includes the following process: S61. Determine monitoring indicators: select the pH value, chemical oxygen demand, biochemical oxygen demand, suspended solids, and ammonia nitrogen parameters of the sewage to be monitored; S62. Select monitoring locations: monitor the quality of incoming sewage at the water inlet, arrange monitoring equipment in the grit chamber, regulating tank, aerobic tank, and sedimentation tank, evaluate the treatment efficiency of each treatment process, and monitor the effluent quality at the water outlet; S63. Use monitoring instruments to monitor the pH value, chemical oxygen demand, biochemical oxygen demand, suspended solids, and ammonia nitrogen parameters of the sewage online in real time; S64. Record the monitored data, including monitoring time, monitoring location, and sewage parameter values, and analyze and evaluate the data.

Images