A system for harmless disposal and resource utilization of seafood sludge
By designing a system for the harmless treatment and resource utilization of seafood sludge, multiple problems in seafood sludge treatment have been solved, achieving the harmless conversion and resource utilization of organic matter, reducing environmental risks, and possessing the advantages of high efficiency, low investment, and small footprint.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 安徽海螺环保集团有限公司
- Filing Date
- 2025-06-25
- Publication Date
- 2026-07-10
AI Technical Summary
Seafood sludge treatment faces challenges such as high salt content and difficulty in handling organic matter, limited resource utilization, environmental and health risks, an unsound management mechanism, and insufficient public awareness.
A system for the harmless treatment and resource utilization of seafood sludge was designed, including a sludge receiving system, an anaerobic digestion system, a biogas purification and utilization system, a digestion liquid dehydration system, a biogas residue drying system, and a deodorization system. Through washing, sand removal, anaerobic digestion, biogas purification, solid-liquid separation, drying, and deodorization, the system achieves the harmless treatment and resource utilization of organic matter by converting it into biogas and biogas residue.
It achieves the harmless treatment and resource utilization of seafood sludge, significantly reduces organic matter, recycles energy, reduces environmental risks, and ensures air quality in the workshop. It has the advantages of high efficiency, low investment, and small footprint.
Smart Images
Figure CN224478030U_ABST
Abstract
Description
Technical Field
[0001] This utility model patent belongs to the field of environmental protection technology, specifically relating to a system for the harmless treatment and resource utilization of seafood sludge. Background Technology
[0002] Seafood sludge mainly refers to organic residues generated during seafood processing, treatment, or wastewater treatment. It typically contains abundant organic matter, salt, microorganisms, and potential pollutants, characterized by high organic matter content, high salinity, high moisture content and viscosity, and high nitrogen and phosphorus content. Its treatment requires a combination of desalination, stabilization, and resource recovery technologies, while strictly monitoring pollutant levels to ensure environmental safety. Rational utilization can convert it into energy or fertilizer, but this requires advanced technology.
[0003] The disposal of seafood sludge has many shortcomings and deficiencies, mainly reflected in: ① imperfect treatment technology, with high salt content and organic matter making treatment difficult; ② limited resource utilization, including salt accumulation and soil degradation, heavy metals and chemical residues; ③ environmental and health risks, such as eutrophication and hypoxia, and the spread of pathogenic microorganisms; ④ shortcomings in management mechanisms and policies, including an incomplete regulatory system and poor coordination between standards and policies; and ⑤ social perception and the plight of small-scale farmers. Utility Model Content
[0004] The purpose of this utility model is to design a system for the harmless treatment and resource utilization of seafood sludge. It aims to innovate the technology for the treatment of seafood sludge, optimize the resource utilization path, gradually make up for the shortcomings of seafood sludge treatment, and achieve the dual goals of environmental benefits and resource recycling.
[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:
[0006] A system for the harmless treatment and resource utilization of seafood sludge includes a sludge receiving system, an anaerobic digestion system, a biogas purification and utilization system, a digestate dehydration system, a biogas residue drying system, and a deodorization system.
[0007] The sludge receiving system is connected to the sludge discharge port of the anaerobic digestion system. The sludge receiving system is used to collect seafood sludge and to clean and remove sand.
[0008] The mixed liquid overflow outlet at the top of the anaerobic digestion system is connected to the feed inlet of the digestion liquid storage tank, and the biogas exhaust outlet at the top center is connected to the gas inlet of the biogas boiler. The anaerobic digestion system decomposes and converts the cleaned organic matter into biogas.
[0009] The biogas boiler in the biogas purification and utilization system is equipped with two steam outlet pipes. One steam outlet pipe is connected to the heat exchanger in the anaerobic digestion system, and the other steam outlet pipe is connected to the dryer.
[0010] The centrifugal dehydrator input of the digestion liquid dehydration system is connected to the digestion liquid storage tank and the dosing device, and the biogas residue discharge pipe is connected to the biogas residue dryer. The centrifugal dehydrator separates the digestion liquid in the anaerobic digestion system into solid and liquid components.
[0011] The biogas residue drying system further dries the biogas residue produced after the digester has been centrifuged and dehydrated. The end of the biogas residue dryer is connected to a condensate pipe and a tail gas deodorization pipe.
[0012] The deodorization system performs deodorization treatment on the entire system, and the air intake pipe of the deodorization system is connected to the workshop of all systems.
[0013] Preferably, the sludge receiving system is used to collect seafood sludge and clean and remove sand. The system includes a receiving hopper and a sand remover. The seafood sludge is stored in the receiving hopper for buffering. The sludge in the receiving hopper is mixed with dilution water and transported to the downstream sand removal system. The sand remover removes sand particles and other impurities from the sludge.
[0014] Preferably, the receiving hopper of the sludge receiving system is connected to the sand remover via a spiral conveying pipe. This connection method facilitates the mixing and conveying of sludge and dilution water, thereby improving the sand removal efficiency.
[0015] Preferably, the sand remover includes a sand and gravel outlet and a sludge outlet, and the sludge outlet is connected to the inlet of the anaerobic digester.
[0016] Preferably, the anaerobic digestion system decomposes and converts the cleaned organic matter into biogas, including an anaerobic digester, a stirrer, and a heat exchanger. The anaerobic digester stores seafood sludge after sand removal, and the stirrer is installed inside the tank to continuously stir during the degradation process, promoting the decomposition of organic matter.
[0017] Preferably, the anaerobic digester is provided with a liquid outlet and a gas outlet, the liquid outlet being connected to the inlet of the digestate storage tank, and the gas outlet being connected to the biogas boiler.
[0018] Preferably, the heat exchanger is provided with a steam input pipe, which is connected to the steam outlet of the biogas boiler.
[0019] Preferably, the anaerobic digester overflows from the top, and the overflowing mixture flows into the digester dehydration system. The generated biogas is sent to the biogas purification and utilization system through a pipeline. The heat exchanger transfers the heat of the heated steam to the anaerobic digester to maintain the temperature of the anaerobic digester at 37±2℃, providing a suitable environment for anaerobic digestion.
[0020] Preferably, the biogas purification and utilization system uses in-situ desulfurization combined with dry desulfurization in the tank for purification. In-tank desulfurization involves adding inorganic salts into the anaerobic digester to remove hydrogen sulfide through an oxidation-reduction reaction.
[0021] Preferably, the digestive fluid dehydration system separates the digestive fluid in the anaerobic digestion system into solid and liquid components. The system includes a digestive fluid storage tank, a centrifuge, and a dosing device. The inlet of the digestive fluid storage tank is connected to the liquid outlet of the anaerobic digestion tank, and the outlet of the dosing device and the outlet of the digestive fluid storage tank are both connected to the centrifuge.
[0022] Preferably, the digestion fluid storage tank is used for buffering. After the flocculant is added to the dosing device, it is effectively mixed with the anaerobic digestion fluid. The mixture is then separated into solid and liquid in a centrifuge to achieve dehydration of the digestion fluid.
[0023] Preferably, the biogas residue drying system includes a biogas residue dryer, which uses the principle of indirect heat conduction for thermal drying, which can reduce energy consumption and lower operating costs. At the same time, the drying waste gas is discharged in compliance with standards after condensation and dehumidification, avoiding pollution to the environment.
[0024] Preferably, the biogas residue dryer has two inlets, one connected to the centrifuge outlet for inputting biogas residue, and the other connected to the steam outlet of the biogas boiler for inputting biogas as energy. The biogas residue dryer also has two outlets for outputting exhaust gas and condensate, respectively.
[0025] Preferably, the deodorization system adopts a combined treatment process of front-end negative pressure collection, acid washing, alkaline washing, biological filter and 15m exhaust stack discharge. The negative pressure collection is connected to each system by pipelines, and the negative pressure pipelines pass through the acid washing tank, alkaline washing tank and biological filter, and finally discharged from the exhaust stack.
[0026] Preferably, the deodorization air volume of the deodorization system is 20,000 m³ / h. 3 / Hour, the workshop air exchange rate is no less than 6 times.
[0027] The beneficial effects of this utility model are as follows:
[0028] 1. The various systems of this invention are well-configured, and production and environmental protection processes and equipment are fully considered and configured.
[0029] 2. This invention enables the harmless treatment and resource utilization of seafood sludge, converting organic matter into biogas and using it for biogas residue drying, achieving significant volume reduction and effective energy recycling.
[0030] 3. This invention uses inorganic salts to desulfurize the anaerobic tank, which has the advantages of high efficiency, low investment and small footprint. Attached Figure Description
[0031] Figure 1 This is a process flow diagram of this utility model;
[0032] Figure 2 This is a flowchart illustrating the specific processing steps of this utility model.
[0033] In the diagram: sludge receiving system 1, receiving silo 11, sand remover 12, anaerobic digestion system 2, anaerobic digester 21, agitator 22, heat exchanger 23, biogas purification and utilization system 3, biogas boiler 31, digestate dewatering system 4, digestate storage tank 41, centrifugal dewatering machine 42, dosing device 43, biogas residue drying system 5, biogas residue dryer 51, and deodorization system 6. Detailed Implementation
[0034] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0035] like Figure 1 and Figure 2 As shown, this utility model includes a sludge receiving system 1, an anaerobic digestion system 2, a biogas purification and utilization system 3, a digestate dehydration system 4, a biogas residue drying system 5, and a deodorization system 6.
[0036] The sludge receiving system 1 has its sludge discharge outlet connected to the feed inlet of the anaerobic digestion system 2. The sludge receiving system 1 is used to collect seafood sludge and to clean and remove sand.
[0037] The mixed liquid overflow outlet at the top of the anaerobic digestion system 2 is connected to the feed inlet of the digestion liquid storage tank 41, and the biogas exhaust outlet at the top center is connected to the air inlet of the biogas boiler 31. The anaerobic digestion system 2 decomposes and converts the cleaned organic matter into biogas.
[0038] The biogas boiler 31 in the biogas purification and utilization system 3 is equipped with two steam outlet pipes. One steam outlet pipe is connected to the heat exchanger 23 in the anaerobic digestion system 2, and the other steam outlet pipe is connected to the dryer 51.
[0039] The input end of the centrifugal dehydrator 42 of the digestion dehydration system 4 is connected to the digestion storage tank 41 and the dosing device 43, and the biogas residue discharge pipe is connected to the biogas residue dryer 51. The centrifugal dehydrator 42 separates the digestion liquid in the anaerobic digestion system 2 into solid and liquid components.
[0040] The biogas residue drying system 5 further dries the biogas residue produced after the digester liquid is centrifuged and dehydrated. The end of the biogas residue dryer 51 is connected to the condensate pipe and the exhaust gas deodorization pipe.
[0041] The deodorization system 6 performs deodorization treatment on the entire system, and the air intake pipe of the deodorization system 6 is connected to the workshop of all systems.
[0042] In this embodiment, the sludge receiving system 1 serves as a temporary storage and buffer for sludge. The receiving silo 11 in the sludge receiving system 1 can receive 150 tons of seafood sludge (13% solids content) and 150 tons of unconcentrated sludge (1% solids content) per day. The seafood sludge and unconcentrated sludge are mixed in the receiving silo 11 to form 300 tons (13% solids content) of seafood sludge.
[0043] In this embodiment, the seafood sludge in the receiving silo 11 enters the desander 12 through a spiral conveying pipe connected to the desander 12. The desander 12 adopts mature technologies such as cyclone desanding or mechanical screening, and effectively separates inorganic impurities such as sand and gravel mixed in the sludge by using centrifugal force or mechanical screening principle. This avoids these impurities causing equipment wear or affecting the treatment effect in subsequent anaerobic digestion and other treatment processes. After the 300 tons (13% solids content) of seafood sludge undergoes desanding, 0.5 tons (40% solids content) of sand and gravel are obtained for off-site disposal, and 299.5 tons (6.95% solids content) of seafood sludge enter the anaerobic digester 21.
[0044] In this embodiment, the seafood sludge in the anaerobic digester 21 is in an anaerobic environment, and the rich microbial community in the tank begins to degrade and metabolize the organic matter in the sludge. The stirrer 22 runs continuously at a constant speed to ensure that the sludge and microorganisms are in full contact, promote the uniform decomposition reaction of organic matter, and prevent the occurrence of insufficient local reaction.
[0045] In this embodiment, the anaerobic digester 21 generates 4850~5750m³ of organic matter during the degradation process. 3 The biogas and 294 tons (containing 5.3% solids) of mixed liquid will cause the liquid level in the tank to rise. When the mixed liquid reaches the set level at the overflow port at the top of the anaerobic digester 21, the mixed liquid will automatically overflow into the digester liquid storage tank 41 of the digester liquid dehydration system 4 for buffering. The biogas produced will be promptly transported to the biogas boiler 31 of the biogas purification and utilization system 3 through a sealed pipeline.
[0046] In this embodiment, the biogas boiler 31 generates 1.9 tons of steam per hour by burning biogas to heat the liquid. The biogas boiler 31 continuously heats the steam, of which 0.5 tons of steam transfers the heat of the steam to the anaerobic digester 21 through the heat exchanger 23. The temperature control system monitors and adjusts the temperature in the anaerobic digester 21 in real time to keep the temperature at 37±2℃. The remaining 1.4 tons of steam enters the biogas residue dryer 51.
[0047] In this embodiment, the biogas purification and utilization system 3 adopts a composite process of in-situ desulfurization and dry desulfurization to purify biogas, and in-situ desulfurization is carried out in the anaerobic digester 21.
[0048] In this embodiment, the mixed liquid in the digestion liquid storage tank 41 is fed into the centrifugal dewatering machine 42 in batches according to the processing capacity of the centrifugal dewatering machine 42. The dosing device 43 adds 3-4 kg of flocculant per ton of mixed liquid, adding 79 tons of flocculant to 294 tons of mixed liquid. The flocculant causes the solid particles in the mixed liquid to agglomerate, increasing the particle size and weight. Under the high-speed rotation of the centrifugal dewatering machine 42, the solid particles are thrown against the inner wall of the centrifugal drum, forming a 47-ton (20% solid content) filter cake. The feed inlet of the biogas residue dryer 51 is connected to the biogas residue discharge pipe of the centrifugal dewatering machine 42. The centrifugal dewatering machine 42 transports the filter cake formed by the biogas residue to the biogas residue dryer 51 through the biogas residue discharge pipe. The other 326 tons of centrifugal wastewater are discharged through the holes on the drum, achieving efficient solid-liquid separation.
[0049] In this embodiment, the biogas residue dryer 51 transfers heat to the biogas residue through heat conduction. During the drying process, the biogas residue is constantly turned over in the dryer and comes into full contact with the heated surface. The moisture gradually evaporates and condenses to obtain 26 tons of condensed wastewater and 21 tons of solid waste (containing 45% solids). The condensed wastewater and centrifuged wastewater are sent to the wastewater treatment plant together, while the solid waste is incinerated externally.
[0050] In this embodiment, the deodorization system 6 covers the workshop containing the sludge receiving system 1, the anaerobic digestion system 2, the digestate dewatering system 4, and the biogas residue drying system 5. It deodorizes by using a combination of processes including a front-end negative pressure collection device, acid washing, alkali washing, a biological filter, and a 15m exhaust stack. The deodorization air volume of the deodorization system 6 is set at 20,000 m³ / hour. By rationally arranging ventilation ducts and air outlets, it ensures that the number of air changes in the workshop is not less than 6 times, effectively maintaining the air quality in the workshop and protecting the health of the staff and a good working environment.
[0051] Detailed implementation methods and principles:
[0052] The sludge receiving system 1 temporarily stores seafood sludge and unconcentrated sludge in the receiving hopper 11. The two are mixed to form a new sludge mixture, which provides uniform material for subsequent treatment. The mixed sludge enters the desander 12 through a spiral conveying pipe connected to the desander 12. The desander 12 uses cyclone desanding or mechanical screening technology to separate inorganic impurities such as sand and gravel from the sludge. The remaining sludge enters the anaerobic digester 21.
[0053] In the anaerobic environment of the anaerobic digester 21, the microbial community degrades the organic matter in the sludge. The agitator 22 operates continuously to ensure that the sludge and microorganisms are in full contact. Biogas and mixed liquid are produced during the digestion process. The temperature control system transfers heat through the heat exchanger 23 to maintain a suitable temperature inside the tank. After the biogas is purified by in-situ desulfurization combined with dry desulfurization, it is burned in the biogas boiler 31 to generate steam. Part of the steam is used to heat the anaerobic digester 21, and the remaining steam enters the biogas residue dryer 51. The mixed liquid enters the centrifugal dewatering machine 42 in batches from the digestion liquid storage tank 41. The dosing device 43 adds flocculant to coagulate solid particles. After centrifugation, filter cake and wastewater are obtained.
[0054] The biogas residue dryer 51 evaporates the moisture in the biogas residue through heat conduction. The wastewater generated is treated together with the centrifugal wastewater, while the solid waste is incinerated. The deodorization system 6 covers the workshop where the sludge receiving system 1, anaerobic digestion system 2, digestate dewatering system 4, and biogas residue dryer 5 are located. The system treats the exhaust gas through a combination of processes such as front-end negative pressure collection, acid washing, alkali washing, and biological filter to ensure the air quality in the workshop.
[0055] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.
Claims
1. A system for the harmless treatment and resource utilization of seafood sludge, characterized in that, It includes a sludge receiving system (1), an anaerobic digestion system (2), a biogas purification and utilization system (3), a digestate dehydration system (4), a biogas residue drying system (5), and a deodorization system (6); The sludge receiving system (1) is connected to the inlet of the digestive liquid storage tank (41). The sludge receiving system (1) is used to collect seafood sludge and clean and remove sand. The anaerobic digestion system (2) is connected to the mixing liquid overflow port at the top and the feed inlet of the digestion liquid storage tank (41), and the biogas exhaust port at the top middle is connected to the gas inlet of the biogas boiler (31). The anaerobic digestion system (2) decomposes and converts the cleaned organic matter into biogas. The biogas boiler (31) in the biogas purification and utilization system (3) is equipped with two steam outlet pipes. One steam outlet pipe is connected to the heat exchanger (23) in the anaerobic digestion system (2), and the other steam outlet pipe is connected to the dryer (51). The input end of the centrifugal dehydrator (42) of the digestion dehydration system (4) is connected to the outlet of the digestion storage tank (41) and the dosing device (43). The biogas residue discharge pipe is connected to the feed inlet of the biogas residue dryer (51). The centrifugal dehydrator (42) separates the digestion liquid in the anaerobic digestion system (2) into solid and liquid components. The biogas residue drying system (5) further dries the biogas residue produced after the digestion liquid is centrifuged and dehydrated. The end of the biogas residue dryer (51) is connected to the condensate pipe and the exhaust gas deodorization pipe. The deodorization system (6) performs deodorization treatment on the entire system, and the air intake pipe of the deodorization system (6) is connected to the workshop of all systems.
2. The system for harmless treatment and resource utilization of seafood sludge according to claim 1, characterized in that, The sludge receiving system (1) includes a receiving silo (11) and a desander (12). The receiving silo (11) is connected to the desander (12) through a spiral conveying pipe. Seafood sludge is stored in the receiving silo (11) for buffering. The sludge and dilution water in the receiving silo (11) are mixed and transported together to the rear desander (12) through the spiral conveying pipe.
3. The system for harmless treatment and resource utilization of seafood sludge according to claim 1, characterized in that, The anaerobic digestion system (2) includes an anaerobic digester (21), a stirrer (22), and a heat exchanger (23). The inlet of the anaerobic digester (21) is connected to the outlet of the desander (12). The anaerobic digester (21) stores seafood sludge after desanding and degrades organic matter in the tank. The anaerobic digester (21) contains a stirrer (22) that continuously stirs the mixture during the degradation process. The anaerobic digester (21) overflows from the top and the overflow mixture is introduced into the digestion liquid dehydration system (4) through a pipeline. The biogas produced is sent to the biogas purification and utilization system (3) through a pipeline.
4. The system for harmless treatment and resource utilization of seafood sludge according to claim 1, characterized in that, The biogas boiler (31) of the biogas purification and utilization system (3) is connected to the anaerobic digester (21) by a pipeline. The biogas is burned in the biogas boiler (31) to heat the steam.
5. The system for harmless treatment and resource utilization of seafood sludge according to claim 3, characterized in that, The heat exchanger (23) is connected to the biogas boiler (31) and transfers the heat of the heated steam to the anaerobic digester (21) to maintain the temperature of the anaerobic digester (21) at 37±2℃.
6. The system for harmless treatment and resource utilization of seafood sludge according to claim 1, characterized in that, The digestion liquid dehydration system (4) includes a digestion liquid storage tank (41), a centrifugal dehydrator (42), and a dosing device (43). The inlet of the digestion liquid storage tank (41) is connected to the anaerobic digester (21) to store the mixed liquid overflowing from the anaerobic digester (21). The outlet of the digestion liquid storage tank (41) and the outlet of the dosing device (43) are both connected to the inlet of the centrifugal dehydrator (42). The centrifugal dehydrator (42) dehydrates the mixed liquid. After flocculant is added to the dosing device (43), it is effectively mixed with the mixed liquid, and solid-liquid separation is completed in the centrifugal dehydrator (42).
7. The system for harmless treatment and resource utilization of seafood sludge according to claim 1, characterized in that, The biogas residue drying system (5) includes a biogas residue dryer (51), which performs thermal drying treatment on dewatered biogas residue, and the dried waste gas is discharged in compliance with standards after condensation and dehumidification.
8. The system for harmless treatment and resource utilization of seafood sludge according to claim 1, characterized in that, The air inlet of the deodorization system (6) is located in the workshop where the sludge receiving system (1), anaerobic digestion system (2), digestion liquid dehydration system (4) and biogas residue drying system (5) are located.