Liquid filtering device for gelatin production and use method thereof

Abstract

According to the liquid filtering device for gelatin production and the use method thereof, grease discharge and aeration treatment can be performed in advance, the investment cost of later wastewater treatment equipment is reduced, and the later wastewater treatment efficiency is improved; the liquid filtering device comprises a separation bin, a filtrate bin, a stirring assembly, a spiral conveying pipe, a liquid level sensor and a temperature sensor, the separation bin comprises a cylinder part and a circular truncated cone part, a grease discharging opening is formed in the annular side of the cylinder part, cooling pipes are arranged at the bottom and the side wall of the circular truncated cone part in a coiled mode, and filtering holes allowing liquid to pass through are formed between the cooling pipes. Fluororesin fiber filter cloth is arranged at the bottom and on the side wall of the circular truncated cone part; the filtrate bin is arranged at the bottom of the separation bin, an opening of the filtrate bin is connected with the cylinder part, a filtrate discharge pipe for filtrate to penetrate out is arranged at the bottom of the filtrate bin, and an aeration nozzle is arranged in the filtrate bin; the stirring assembly penetrates through the separation bin and the filtrate bin; the spiral conveying pipe is connected to the grease discharging opening, and part of the spiral blades enter the separating bin.

Description

Technical Field

[0001] The invention relates to the field of liquid treatment for gelatin production, and in particular to a liquid filtering device for gelatin production and a method for using the same. Background Art

[0002] Gelatin is a fat-free, high-protein food extracted from animal bones and skins. The wastewater generated in its production process mainly comes from processes such as degreasing, acid soaking, liming, neutralization, gelatin making and calcium hydrogen phosphate production. The composition is complex and difficult to handle.

[0003] The general gelatin wastewater treatment process is as follows: the wastewater is injected into the gray water collection tank, and then enters the comprehensive collection tank after part of the suspended matter is precipitated in the pre-sedimentation tank. It flows through the regulating tank and the primary sedimentation tank in sequence through the pipeline, and polyacrylamide is added to condense and clarify the suspended particles. Then it is injected into the flotation tank, and then passes through the hydrolysis tank and the anaerobic tank in sequence. Then it is injected into the aerobic tank with pump stirring to make the organic matter degrade more thoroughly; finally, it is precipitated again in the secondary sedimentation tank to form discharge water, in which part of the sludge flows back from the secondary sedimentation tank to the hydrolysis tank. The grease in the gelatin wastewater is multiplied by the microbial flora in the aerobic tank, so that the grease is decomposed and metabolized.

[0004] However, the aerobic pool also needs to decompose and metabolize pollutants such as protein, gelatin, sucrose and lactose in the wastewater. The introduction of oil and fat increases the decomposition burden of the aerobic pool, resulting in low decomposition efficiency. At the same time, an average of 1,000 to 1,500 tons of water are consumed for every ton of gelatin produced, and some even consume up to 2,000 tons. Therefore, gelatin production will produce a large amount of wastewater. About 300m3 of wastewater is generated for every ton of bone raw material processed. The wastewater treatment volume is huge. If it remains in the aerobic pool for a long time, the aerobic pool will occupy a large area and the plant cost will increase significantly. Summary of the invention

[0005] The object of the present invention is to provide a liquid filtering device for gelatin production and a method of using the same, which can perform grease discharge and aeration treatment in advance, reduce the investment cost of subsequent wastewater treatment equipment, and improve the efficiency of subsequent wastewater treatment.

[0006] The embodiment of the present invention is achieved as follows:

[0007] A liquid filtering device for gelatin production, the liquid filtering device comprises: a separation chamber, a filtrate chamber, a stirring assembly, a spiral conveying pipe, a liquid level sensor and a temperature sensor. The separation chamber is an inverted truncated cone-shaped cylinder, which comprises a cylindrical part and a truncated cone part, wherein a liquid infusion pipe is arranged on the top of the cylindrical part; a grease discharge port is arranged on the annular side of the cylindrical part, a cooling pipe is arranged on the bottom and side wall of the truncated cone part, filter holes for liquid to pass through are arranged between the cooling pipes, and a fluororesin fiber filter cloth is arranged on the bottom and side wall of the truncated cone part; the filtrate chamber is arranged at the bottom of the separation chamber, the opening of the filtrate chamber is connected to the cylindrical part, a filtrate discharge pipe for filtrate to pass through is arranged at the bottom of the filtrate chamber, and an aeration nozzle is arranged in the filtrate chamber; the stirring assembly runs through the separation chamber and the filtrate chamber; the spiral conveying pipe is connected to the grease discharge port, and part of the spiral blades enter the separation chamber; the liquid level sensor and the temperature sensor are arranged in the separation chamber, and the liquid level of the liquid filtering device is controlled between the grease discharge port and the truncated cone part.

[0008] In a preferred embodiment of the present invention, the above-mentioned stirring assembly includes: a stirring motor, a coupling, a first stirring shaft and a second stirring shaft, a scraper, a double helix belt stirring blade, and a disc turbine stirring blade. The stirring motor is arranged at the top of the separation bin; the coupling is fixedly arranged at the bottom center of the truncated cone portion; the first stirring shaft is located in the separation bin, and the two ends of the first stirring shaft are respectively connected to the coupling and the stirring motor; the second stirring shaft is located in the filtrate bin, and the second stirring shaft is connected to the coupling; the scraper is connected to the first stirring shaft, and the scraper scrapes off the solidified grease on the top of the cylindrical portion; the double helix belt stirring blade is arranged in the separation bin, and the diameter of the double helix belt stirring blade decreases from top to bottom; the disc turbine stirring blade is arranged in the filtrate bin.

[0009] In a preferred embodiment of the present invention, the filter holes are truncated cone-shaped through holes with isosceles trapezoidal cross-sections, wherein the through holes on the separation chamber side are small-diameter through holes, and the through holes on the filtrate chamber side are large-diameter through holes.

[0010] In a preferred embodiment of the present invention, the spiral conveying pipe is arranged obliquely, and the spiral conveying pipe comprises a spiral conveying motor, a transmission shaft, and spiral blades.

[0011] In a preferred embodiment of the present invention, a heating element is provided in the filtrate bin.

[0012] In a preferred embodiment of the present invention, the cooling pipe is externally connected to a refrigeration cycle device.

[0013] In a preferred embodiment of the present invention, the liquid inlet pipe is provided with a first solenoid valve, and the filtrate outlet pipe is provided with a second solenoid valve.

[0014] In a preferred embodiment of the present invention, the liquid filtering device further comprises a PLC controller, which is communicatively connected with the liquid level sensor, the temperature sensor, the heating element, the refrigeration cycle device, the first solenoid valve and the second solenoid valve respectively.

[0015] A method for using a liquid filtration device for gelatin production, the liquid filtration device for gelatin production described in any of the above, the method for using the liquid filtration device for gelatin production comprising:

[0016] The PLC controller controls the first solenoid valve to open, and when the water source to be treated enters the separation chamber from the liquid filling pipe, the refrigeration cycle device is activated; at this time, the water source to be treated in the liquid filtration device is less, and the fluororesin fiber filter cloth retains the liquid part with grease in the separation chamber. The temperature of the cooling pipes arranged on the bottom and side walls of the truncated cone is low, and the water source to be treated with grease contacts the low-temperature cooling pipes, causing the grease molecules to condense, and part of the filtrate is discharged from the fluororesin fiber filter cloth and the filter holes;

[0017] The water source to be treated is continuously poured in. When the filtrate in the filtrate bin is full and the liquid level is between the grease discharge port and the frustum, the second solenoid valve is controlled to open and the stirring assembly is controlled to rotate intermittently at high and low speeds. At this time, the liquid inflow and discharge volumes of the first solenoid valve and the second solenoid valve are the same. As the liquid level rises, the aeration nozzle starts to aerate at the same time, and gas enters from the filter hole. Under the influence of airflow and grease density, the grease condensed in the early stage begins to float up.

[0018] When the stirring assembly rotates, the double helix belt stirring blades located in the separation chamber rotate at a high speed, and the material generates shear, convection, diffusion and other composite motions in the truncated cone part, so that the liquid containing oil molecules evenly contacts the wall with the cooling pipe, thereby accelerating the grease coagulation; at the same time, the disc turbine stirring blades located in the filtrate chamber generate radial flow, accelerating the movement of aeration gas to the separation chamber, and the gas enters from the filter holes to help the oil coagulate and float; a scraper is provided on the cylindrical part, and during the coagulation process, the scraper further collects the larger coagulated oil together, and the floating coagulated oil is concentrated at the oil discharge port, and the oil is removed with the help of the spiral conveying pipe.

[0019] In a preferred embodiment of the present invention, when the liquid filter device needs to be cleaned, the filtrate discharge pipe is closed; the heating element is turned on, the grease solidified on the fluororesin fiber filter cloth is melted, mixed into the separation chamber, and discharged from the grease discharge port.

[0020] The beneficial effects of the embodiments of the present invention are as follows: the liquid filtering device of the present invention is used for gelatin production, and is provided with a separation chamber and a filtrate chamber. The separation chamber is provided with a cooling pipe for helping grease condensation and a stirring assembly. During the centrifugal stirring process of the stirring assembly, the liquid to be treated frequently contacts the cooling pipe provided on the truncated cone portion, so that the grease molecules condense into macromolecules and float upward at the same time; during the stirring process, the grease floating upward continues to converge under the action of the scraper and is discharged toward the grease discharge port; the filtrate enters the filtrate chamber through the fluororesin fiber filter cloth and the filter holes for further treatment, and the entire liquid filtering device completes the treatment in a closed environment, thereby avoiding the overflow of waste gas;

[0021] The filtrate tank is also equipped with a heating element for cleaning the liquid filtration device; the filtrate tank is also equipped with an aeration nozzle for aeration. Through pre-aeration, the acidification degree of anaerobic influent is stably controlled below 50%, the sulfide concentration in the raw water is reduced, and the COD is stabilized below 1000mg / L;

[0022] At the same time, it can separate the oil and fat in the liquid by physical means, providing a basis for the subsequent efficient treatment of the filtrate, and can reduce the subsequent wastewater treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 The structure of the liquid filtering device of the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 The structure of the liquid filtering device of the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 3 This is a schematic structural diagram of a control part of a liquid filtering device according to a first embodiment of the present invention;

[0027] Figure 4 This is a flow chart of the use of the liquid filtering device according to the first embodiment of the present invention;

[0028] Figure 5 This is a schematic structural diagram of a liquid filtering device according to Embodiment 2 of the present invention.

[0029] Icons: liquid filtering device 100; separation chamber 110; cylindrical portion 111; truncated cone portion 112; liquid filling pipe 113; first solenoid valve 114; grease discharge port 115; liquid level sensor 116; temperature sensor 117; filtrate chamber 120; heating element 121; aeration nozzle 122; filtrate discharge pipe 123; second solenoid valve 124; spiral conveying pipe 130; conveying pipe 131; spiral conveying motor 132; transmission shaft 133; spiral blade 134; grease collecting pipe 135; gas collecting pipe 136; cooling pipe 141; refrigeration cycle device 140; filter hole 150; fluororesin fiber filter cloth 160;

[0030] Stirring assembly 170; stirring motor 171; coupling 172; first stirring shaft 173; second stirring shaft 174; scraper 175; double helical belt stirring blade 176; disc turbine stirring blade 177;

[0031] PLC controller 180;

[0032] A third solenoid valve 119; and a liquid outlet pipe 118. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the gelatin production process, wastewater mainly comes from defatting, pickling, liming, neutralization, gelatin making and calcium hydrogen phosphate production. The amount and quality of gelatin wastewater fluctuate greatly, and the wastewater has good biodegradability. It contains a large amount of soluble protein from the original skin, fat and other organic matter and low molecular additives such as formic acid, and the BOD / COD is usually 0.4-0.5.

[0040] In the biochemical treatment process, the oxidation ditch process uses delayed aeration, which has a long hydraulic retention time, stable treatment effect, good effluent quality, and good denitrification function. However, due to the limitations of aeration equipment (mainly using rotating discs, rotating brushes and surface aerators), the water depth of the oxidation ditch cannot be too deep, so it occupies a large area. The weather is relatively cold in winter, and the air blast aeration method is used to maintain the water temperature of the biochemical pool. This increases the land cost and equipment cost of the entire gelatin wastewater treatment.

[0041] First embodiment

[0042] See also Figure 1-4This embodiment provides a liquid filtration device for gelatin production. The liquid filtration device 100 includes a separation chamber 110 and a filtrate chamber 120 disposed at the bottom of the separation chamber 110. The separation chamber 110 is used to separate oil and fat, and the filtrate chamber 120 is used for pre-aeration.

[0043] Specifically, the separation chamber 110 is configured as an inverted truncated cone-shaped cylinder, including a cylindrical portion 111 and a truncated cone portion 112 disposed below the cylindrical portion 111. A liquid inlet pipe 113 is disposed on the top of the cylindrical portion 111, and a first electromagnetic valve 114 is disposed on the liquid inlet pipe 113. The liquid to be treated enters the separation chamber 110 from the liquid inlet pipe 113, and after oil and fat separation, the filtrate enters the filtrate chamber 120.

[0044] A grease outlet 115 protruding toward the outer wall is provided near the middle and upper part of the ring side of the cylindrical portion 111 . The grease outlet 115 is further equipped with a spiral conveying pipe 130 , which is inclined at 3-5°.

[0045] The spiral conveying pipe 130 includes a conveying pipe, a spiral conveying motor 132 arranged at the tail end of the conveying pipe 131, a transmission shaft 133 connected to the spiral conveying motor 132, and a spiral blade 134 arranged on the transmission shaft 133. Part of the spiral blade 134 enters into the separation chamber 110. The rotating spiral blade 134 is used to push the grease to achieve the conveyance of the grease, and the grease floating on the liquid surface is discharged.

[0046] The lower part of the tail end of the delivery pipe 131 is connected with a grease collection pipe 135 for discharging the grease to the grease treatment equipment for separate treatment. The grease treatment equipment can be built on the biochemical pool in an overlapping manner to ensure the temperature of the biochemical pool and reduce the floor space. The grease treatment equipment mainly uses Comamonas, Thauera and Hydrogenophaga to remove important bacterial genera of grease components in wastewater. Bacillus amyloliquefaciens and Bacillus licheniformis can also improve the removal rate of wastewater grease. Comamonas, Thauera, Hydrogenophaga: Bacillus amyloliquefaciens, Bacillus licheniformis = 7-8:2-3.

[0047] A gas collecting pipe 136 is connected to the upper portion of the tail end of the delivery pipe 131 for discharging the gas to a gas processing device for separate processing.

[0048] The bottom and the annular side wall of the truncated cone 112 are completely contained in the filtrate bin 120 . The bottom and the annular side wall are sandwich structures. A cooling pipe 141 is disposed inside the sandwich structure. The cooling pipe 141 is externally connected to a refrigeration cycle device 140 . The refrigeration cycle device 140 is used to provide refrigerant to the cooling pipe 141 .

[0049] Filter holes 150 for liquid to pass through are arranged between the cooling pipes 141. The filter holes 150 are truncated cone-shaped through holes with an isosceles trapezoidal cross-section. The through holes on one side of the separation chamber 110 are small-diameter through holes, and the through holes on one side of the filtrate chamber 120 are large-diameter through holes. This design is used to prevent large molecules of oil from passing through. During the aeration process, the airflow is accelerated at the filter holes 150, so that the airflow can impact the fluororesin fiber filter cloth, thereby preventing oil from condensing on the fluororesin fiber filter cloth and causing blockage.

[0050] The bottom of the truncated cone 112 and the inner surface of the side wall are provided with a fluororesin fiber filter cloth 160 to make it oil-proof, water-proof and anti-fouling, thereby improving the filtering performance of oil molecules.

[0051] The stirring assembly passes through the separation chamber 110 and is inserted into the filtrate chamber 120. The liquid level sensor 116 and the temperature sensor 117 are arranged in the separation chamber 110. Intermittent stirring and centrifugation are performed according to the monitoring of the liquid level sensor 116 and the temperature sensor 117. The liquid level sensor 116 monitors the liquid level of the liquid filter device 100 between the grease discharge port 115 and the truncated cone 112. When the liquid level is too low, the liquid filling amount of the liquid filling pipe 113 is increased; when the liquid level is too high, the filtrate discharge amount is increased.

[0052] The temperature sensor 117 is disposed near the truncated cone portion 112 to monitor the temperature change of the liquid near the truncated cone portion 112 .

[0053] The filtrate bin 120 is arranged at the bottom of the separation bin 110 for collecting the filtrate. A heating element 121 is arranged in the filtrate bin 120, and the heating element 121 is arranged in the interlayer of the filtrate bin 120. The inner wall of the filtrate bin 120 is provided with a plurality of aeration nozzles 122, and the aeration nozzles 122 are oriented downward by 30-45 degrees. An air path and an air valve connected to the aeration nozzles 122 are arranged in the interlayer, and a pipeline connected to the aeration device is arranged on the outer wall of the filtrate bin 120 to prevent the filtrate from settling. After being pre-aerated and homogenized in the filtrate bin 120, the filtrate is lifted to the primary sedimentation tank by a pump.

[0054] Sulfuric acid is added to the primary sedimentation tank to produce a neutralization reaction, and the effluent enters the primary sedimentation tank to remove most of the suspended solids and insoluble organic matter. Polyacrylamide is used as a coagulant to improve the co-precipitation effect.

[0055] The opening of the filtrate bin 120 is sealed and connected to the cylindrical portion 111, ensuring that the truncated cone portion 112 is entirely accommodated in the filtrate bin 120. A filtrate discharge pipe 123 for discharging the filtrate is provided at the bottom of the filtrate bin 120. The filtrate discharge pipe 123 is provided with a second solenoid valve 124. After the filtrate is pre-aerated in the filtrate bin 120, the filtrate is further discharged into the biochemical treatment tank.

[0056] The stirring assembly 170 includes a stirring motor 171 , a coupling 172 , a first stirring shaft 173 , a second stirring shaft 174 , a scraper 175 , a double helical belt stirring blade 176 , and a disc turbine stirring blade 177 .

[0057] The stirring motor 171 is arranged at the top of the separation bin 110. The stirring motor 171 uses a variable frequency motor and can select different stirring modes according to the liquid level and temperature. The coupling 172 is fixedly arranged at the bottom center of the truncated cone 112. The first stirring shaft 173 is located in the separation bin 110, and the two ends of the first stirring shaft 173 are respectively connected to the coupling 172 and the stirring motor 171. The second stirring shaft 174 is located in the filtrate bin 120, and the second stirring shaft 174 is connected to the coupling 172.

[0058] The scraper 175 is connected to the first stirring shaft 173, and bristles are arranged on the upper part of the scraper 175. The scraper 175 scrapes off the solidified grease on the top and side of the cylindrical part 111. During the rotation, the enlarged grease is gradually gathered and enters the grease discharge port 115, and is discharged through the spiral conveying pipe 131 of the grease discharge port 115; the double helix belt stirring blade 176 is arranged in the separation bin 110, and the diameter of the double helix belt stirring blade 176 decreases from top to bottom. When rotating at a high speed, it is used to provide centrifugal force to contact the grease macromolecules with the side wall of the truncated cone part 112, so that the grease macromolecules can be condensed through the condensation effect of the cooling tube 141; the disc turbine stirring blade 177 is arranged in the filtrate bin 120, and is used to form a vortex to make the filtrate and the gas fully contact. At the same time, the injected gas can help the grease float.

[0059] The liquid filtering device 100 further includes a PLC controller 180 , which is communicatively connected to the liquid level sensor 116 , the temperature sensor 117 , the heating element 121 , the refrigeration cycle device 140 , the first solenoid valve 114 , and the second solenoid valve 124 , respectively.

[0060] Based on the liquid filtration device 100 for gelatin production provided in this embodiment, please refer to Figure 4 , and its usage is:

[0061] The PLC controller 180 controls the first electromagnetic valve 114 to open, and when the water source to be treated enters the separation chamber 110 from the liquid inlet pipe 113, the refrigeration cycle device 140 is activated. At this time, the water source to be treated in the liquid filtration device 100 is less, and the fluororesin fiber filter cloth 160 retains the liquid part with grease in the separation chamber 110. The cooling pipe 141 arranged on the bottom and side wall of the truncated cone 112 has a low temperature. The water source to be treated with grease contacts the low-temperature cooling pipe 141, causing the grease molecules to condense, and part of the filtrate is discharged from the fluororesin fiber filter cloth 160 and the filter hole 150;

[0062] The water source to be treated is continuously poured in. When the filtrate in the filtrate bin 120 is full and the liquid level is between the grease discharge port 115 and the truncated cone 112, the second solenoid valve 124 is controlled to open and the stirring assembly 170 is controlled to rotate intermittently at high and low speeds. At this time, the first solenoid valve 114 and the second solenoid valve 124 have the same liquid inflow and discharge. As the liquid level rises, the aeration nozzle starts to aerate at the same time, and gas enters from the filter hole 150. The tiny bubbles act as carriers and adhere to the grease in the water, making its density lower than that of water, and then float to the water surface and separate from the water. The treatment effect is significant. Under the influence of airflow and grease density, the grease condensed in the early stage begins to float.

[0063] When the stirring assembly 170 is in high-speed rotation, the double helix belt stirring blade 176 located in the separation chamber 110 rotates at high speed, and the material generates shear, convection, diffusion and other composite motions in the truncated cone portion 112, so that the liquid containing the oil molecules is evenly in contact with the wall surface with the cooling pipe 141, thereby accelerating the condensation of the oil; at the same time, the disc turbine stirring blade 177 located in the filtrate chamber 120 generates radial flow, accelerates the movement of the aerated gas to the separation chamber 110, and the gas enters from the filter hole 150 to help the oil to condense and float; a scraper 175 is provided on the cylindrical portion 111. During the condensation process, the scraper 175 further collects the larger condensed oil together, and the floating condensed oil is concentrated to the oil discharge port 115, and the oil is removed with the help of the spiral conveying pipe 131.

[0064] When there is a lot of grease in the grease outlet 115 , the PLC controller 180 controls the stirring assembly 170 to rotate at a low speed.

[0065] When the liquid filter device 100 needs to be cleaned, the second solenoid valve 124 is closed, the filtrate discharge pipe 123 does not discharge liquid, the heating element 121 in the interlayer of the filtrate bin 120 is turned on to heat the liquid, and the grease solidified on the fluororesin fiber filter cloth 160 and the wall of the separation bin 110 is melted under the action of temperature, and the first solenoid valve 114 is opened to pour clean water into the interior, and then it is discharged from the grease discharge port 115.

[0066] In summary, the liquid filtering device 100 of the present invention is used for gelatin production, and is provided with a separation chamber 110 and a filtrate chamber 120. The separation chamber 110 is provided with a cooling pipe 141 for helping grease condensation, and a stirring assembly 170. During the centrifugal stirring process of the stirring assembly 170, the liquid to be treated frequently contacts the cooling pipe 141 provided on the truncated cone 112, so that the grease molecules condense into macromolecules and float upward at the same time; during the stirring process, the grease floating upward continues to gather under the action of the scraper 175 and is discharged toward the grease discharge port 115; the filtrate enters the filtrate chamber 120 through the fluororesin fiber filter cloth 160 and the filter hole 150 for further treatment;

[0067] The filtrate bin 120 is also provided with a heating element 121 for cleaning the liquid filtering device 100; the filtrate bin 120 is also provided with an aeration nozzle for aeration, and the acidification degree of the anaerobic influent is stably controlled below 50% through pre-aeration, the sulfide concentration in the raw water is reduced by 6.2%, the VFA of the anaerobic effluent is stabilized below 3mEq / L, and the COD is stabilized below 1000mg / L;

[0068] The entire liquid filtering device 100 is processed in a closed environment, thus avoiding the overflow of waste gas; at the same time, the grease in the liquid can be separated by physical means, thus providing a basis for the subsequent efficient treatment of the filtrate.

[0069] Second embodiment

[0070] See also Figure 5 The structure of this embodiment is similar to that of the first embodiment, except that: the separation chamber is not provided with filter holes, but a liquid outlet pipe 118 with a third electromagnetic valve 119 is designed on the side of the truncated cone portion of the separation chamber.

[0071] The usage is:

[0072] The PLC controller 180 controls the first electromagnetic valve 114 to open, and when the water source to be treated enters the separation chamber 110 from the liquid inlet pipe 113, the refrigeration cycle device 140 is activated. At this time, the water source to be treated in the liquid filtration device 100 is less, and the fluororesin fiber filter cloth 160 retains the liquid part with grease in the separation chamber 110. The cooling pipe 141 arranged on the bottom and side wall of the truncated cone 112 has a low temperature. The water source to be treated with grease contacts the low-temperature cooling pipe 141, causing the grease molecules to condense;

[0073] The water source to be treated is continuously poured in, and when the liquid level of the separation chamber 110 is between the grease discharge port 115 and the truncated cone 112, the stirring assembly 170 is controlled to rotate at a low speed. As the liquid level rises, the aeration nozzle starts to aerate, and the gas enters from the filter hole 150. Under the influence of the airflow and the grease density, the grease condensed in the early stage begins to float up.

[0074] When there is a lot of grease at the grease outlet 115, the PLC controller 180 controls the stirring assembly 170 to rotate at a low speed. When the stirring assembly 170 rotates at a low speed, the double helical belt stirring blade 176 located in the separation bin 110 rotates at a low speed, and the material generates a composite motion of shearing, convection, diffusion, etc. in the truncated cone 112, so that the liquid containing grease molecules uniformly contacts the wall surface with the cooling pipe 141, thereby accelerating the condensation of grease, and the discrete oil can float on the water surface quickly, achieving a separation effect; a scraper 175 is provided on the cylindrical portion 111, and the scraper 175 further collects the larger condensed grease during the condensation process, and the floating condensed grease is concentrated to the grease outlet 115, and the grease is removed with the help of the spiral conveying pipe 131.

[0075] When there is no grease condensation in the separation chamber, the third solenoid valve 119 is opened to discharge the filtrate into the filtrate chamber 120 for aeration treatment, and the transmitted gas enters the separation chamber through the liquid outlet pipe and is discharged from the spiral conveying pipe 131.

[0076] When the liquid filter device 100 needs to be cleaned, the second solenoid valve 124 is closed, the filtrate discharge pipe 123 does not discharge liquid, the heating element 121 in the interlayer of the filtrate bin 120 is turned on to heat the liquid, and the grease solidified on the fluororesin fiber filter cloth 160 and the wall of the separation bin 110 is melted under the action of temperature, and the first solenoid valve 114 is opened to pour clean water into the interior, and then it is discharged from the grease discharge port 115.

[0077] The processing efficiency in this embodiment is low, but the separation of grease can still be completed.

[0078] This specification describes examples of embodiments of the present invention, and it is not intended that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in a variety of alternative forms. The drawings need not be drawn to scale; some features can be enlarged or reduced to show the details of specific components. The specific structural and functional details disclosed should not be interpreted as limiting, but are merely representative bases for teaching those skilled in the art to implement the present invention in various forms. It should be understood by those skilled in the art that the multiple features illustrated and described with reference to any of the figures can be combined with the features illustrated in one or more other figures to form embodiments that are not explicitly illustrated or described. The illustrated combined features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention can be used for specific applications or implementations as needed.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid filtration device for gelatin production, characterized in that: The liquid filtering device comprises: a separation chamber, which is an inverted truncated cone-shaped cylinder, comprising a cylindrical portion and a truncated cone portion, wherein a liquid inlet pipe is arranged at the top of the cylindrical portion; a grease outlet is arranged at the annular side of the cylindrical portion, a cooling pipe is arranged at the bottom and side wall of the truncated cone portion, filter holes for liquid to pass through are arranged between the cooling pipes, and a fluororesin fiber filter cloth is arranged at the bottom and side wall of the truncated cone portion; a filtrate chamber, which is arranged at the bottom of the separation chamber, an opening of the filtrate chamber is connected to the cylindrical portion, a filtrate discharge pipe for filtrate to pass through is arranged at the bottom of the filtrate chamber, and an aeration nozzle is arranged in the filtrate chamber; A stirring component, the stirring component penetrates the separation chamber and the filtrate chamber; A spiral conveying pipe, wherein the spiral conveying pipe is connected to the grease discharge port, and a part of the spiral blades enters into the separation chamber; A liquid level sensor and a temperature sensor are provided in the separation chamber to control the liquid level of the liquid filter device between the grease outlet and the truncated cone.

2. The liquid filtration device for gelatin production according to claim 1, characterized in that: The stirring assembly comprises: A stirring motor, wherein the stirring motor is arranged on the top of the separation bin; A coupling, the coupling being fixedly disposed at the bottom center of the truncated cone portion; A first stirring shaft and a second stirring shaft, wherein the first stirring shaft is located in the separation bin, two ends of the first stirring shaft are respectively connected to the coupling and the stirring motor, and the second stirring shaft is located in the filtrate bin, and the second stirring shaft is connected to the coupling; A scraper connected to the first stirring shaft, the scraper scraping off the solidified grease on the top of the cylindrical portion; A double helix belt stirring blade, wherein the double helix belt stirring blade is arranged in the separation bin, and the diameter of the double helix belt stirring blade decreases from top to bottom; A disc turbine stirring blade is arranged in the filtrate bin.

3. The liquid filtration device for gelatin production according to claim 1, characterized in that: The filter holes are truncated cone-shaped through holes with isosceles trapezoidal cross sections, wherein the through holes located on one side of the separation chamber are small-diameter through holes, and the through holes located on one side of the filtrate chamber are large-diameter through holes.

4. The liquid filtration device for gelatin production according to claim 1, characterized in that: The spiral conveying pipe is arranged obliquely and comprises a spiral conveying motor, a transmission shaft and spiral blades.

5. The liquid filtration device for gelatin production according to claim 1, characterized in that: A heating element is arranged in the filtrate bin.

6. The liquid filtration device for gelatin production according to claim 5, characterized in that: The cooling pipe is externally connected to a refrigeration cycle device.

7. The liquid filtration device for gelatin production according to claim 6, characterized in that: The liquid inlet pipe is provided with a first electromagnetic valve, and the filtrate discharge pipe is provided with a second electromagnetic valve.

8. The liquid filtration device for gelatin production according to claim 7, characterized in that: The liquid filtering device further comprises a PLC controller, and the PLC controller is communicatively connected with the liquid level sensor, the temperature sensor, the heating element, the refrigeration cycle device, the first solenoid valve and the second solenoid valve respectively.

9. A method for using a liquid filtration device for gelatin production, characterized in that: The liquid filtration device for gelatin production comprises any one of claims 1 to 8, and the method for using the liquid filtration device for gelatin production comprises: The PLC controller controls the first solenoid valve to open, and when the water source to be treated enters the separation chamber from the liquid filling pipe, the refrigeration cycle device is activated; at this time, the water source to be treated in the liquid filtration device is less, and the fluororesin fiber filter cloth retains the liquid part with grease in the separation chamber. The temperature of the cooling pipes arranged on the bottom and side walls of the truncated cone is low, and the water source to be treated with grease contacts the low-temperature cooling pipes, causing the grease molecules to condense, and part of the filtrate is discharged from the fluororesin fiber filter cloth and the filter holes; The water source to be treated is continuously poured in. When the filtrate in the filtrate bin is full and the liquid level is between the grease discharge port and the frustum, the second solenoid valve is controlled to open and the stirring assembly is controlled to rotate intermittently at high and low speeds. At this time, the liquid inflow and discharge volumes of the first solenoid valve and the second solenoid valve are the same. As the liquid level rises, the aeration nozzle starts to aerate at the same time, and gas enters from the filter hole. Under the influence of airflow and grease density, the grease condensed in the early stage begins to float up. When the stirring assembly rotates, the double helix belt stirring blades located in the separation chamber rotate at a high speed, and the material generates shear, convection, diffusion and other composite motions in the truncated cone part, so that the liquid containing oil molecules evenly contacts the wall with the cooling pipe, thereby accelerating the grease coagulation; at the same time, the disc turbine stirring blades located in the filtrate chamber generate radial flow, accelerating the movement of aeration gas to the separation chamber, and the gas enters from the filter holes to help the oil coagulate and float; a scraper is provided on the cylindrical part, and during the coagulation process, the scraper further collects the larger coagulated oil together, and the floating coagulated oil is concentrated at the oil discharge port, and the oil is removed with the help of the spiral conveying pipe.

10. The method for using the liquid filtration device for gelatin production according to claim 9, characterized in that: When the liquid filter device needs to be cleaned, the filtrate discharge pipe is closed; the heating element is turned on, the grease solidified on the fluororesin fiber filter cloth is melted, mixed into the separation chamber, and discharged from the grease discharge port.

Images