A method for solid-liquid separation of water-soaked feces

Abstract

The invention discloses a method for separating solids and liquids from blister manure. A device for completing the method comprises an open shell, a material inlet, a water flow reflection plate, a baffle, a composite conductive filter screen, and the like. When the device is in use, the material inlet pipe and the pressure in the device are used to make the liquid in the blister manure pass upward through the composite conductive filter screen, and the solids are deposited downward. Electrochemical impurity removal is performed between two layers of the composite conductive filter screens, so that most substances in the liquid are precipitated and precipitated. The deposited precipitate is removed by using a gas-liquid mixture with an additive. After the sedimentation is completed, the solid precipitate is discharged outward by using a spiral conveying pipe. The blister manure treated by the method of the invention can achieve high-efficiency solid-liquid separation, and harmful substances in the blister manure are removed at the same time, thereby facilitating the later treatment of livestock and poultry breeding wastewater.

Description

Technical Field

[0001] The invention belongs to the field of livestock and poultry manure treatment, and specifically relates to a method for solid-liquid separation of water-soaked manure. Background Art

[0002] Livestock and poultry farming inevitably produces large amounts of manure. Due to its high organic matter and nutritional value, manure can be used as an excellent organic fertilizer. However, due to the production process and treatment methods, a large amount of watery manure is produced during livestock and poultry production. The solution to achieve solid-liquid separation of watery manure and wastewater treatment has become a major challenge for the livestock and poultry farming industry.

[0003] At present, the treatment of livestock and poultry manure is an important challenge in the field of environmental protection. Traditional treatment methods include biochemical fermentation technology and wet processes, but there are some problems and limitations. Traditional biochemical fermentation technology requires a long treatment cycle, complex equipment, and high process requirements. This leads to increased treatment costs and operational complexity. In addition, biochemical fermentation technology usually requires a large amount of land resources, which is not feasible in cities and densely populated areas. Wet processes are another commonly used treatment method by using water to dissolve and separate organic matter. However, wet processes produce a large amount of wastewater, which puts pressure on the environment. Especially in low temperature environments, water easily freezes, hindering equipment and facilities. Therefore, there is a need for a simple and effective method to treat waste and manure, quickly and efficiently separate them into liquid and solid parts, and reduce or avoid pollution to the environment.

[0004] CN202310271439.7 discloses a device and method for treating blistered feces, which uses a two-layer filtration method to separate solid matter in blistered feces, and uses macromolecular organic membrane concentration technology to concentrate macromolecular substances in sewage. However, the simple membrane treatment technology has certain limitations on the separation efficiency of solid matter in blistered feces, and the use of molecular membrane treatment technology makes the cost loss of the treatment process even greater, which seriously limits the economy of the process. CN218463920U discloses a livestock manure treatment device for pig farming, which uses spiral dry-wet separation technology to achieve solid-liquid separation in blistered feces. Compared with other methods, this method uses lower energy consumption and can maintain long-term stable operation. However, the simple spiral extrusion solid-liquid separation method is difficult to achieve the precipitation of harmful substances in the liquid, which makes it produce a greater production load on the subsequent water treatment process. Summary of the Invention

[0005] In response to the problems of the prior art, the present invention provides a method for solid-liquid separation of blister feces. This technology utilizes specific processes and equipment to separate blister feces into different components in a relatively short period of time, achieving effective separation of liquid and solid. Simultaneously, this technology can also reduce the generation of wastewater. This technology achieves the solid-liquid separation process of blister feces through a synergistic method of membrane filtration and electrochemical impurity removal, and significantly reduces the content of harmful substances in the treated effluent, thereby improving treatment efficiency and saving costs. Therefore, this technology has broad application prospects and is suitable for use in fields such as waste treatment and environmental protection.

[0006] The device for completing the method of the present invention includes an open shell, a filter screen holder is tiltedly arranged on one side of the upper portion of the shell, a material inlet is arranged on one side of the filter screen holder, a water flow reflection plate is tiltedly arranged below the material inlet and the filter screen holder, a baffle is tiltedly fixed between the water flow reflection plate and the bottom of the shell, two layers of composite conductive filter screens are arranged on the filter screen holder, a high-pressure injection port is opened on the shell and is located above the composite conductive filter screens, an overflow port is opened on the top side of the shell relative to the material inlet, one or more screw conveying pumps are arranged at the bottom of the shell, a sedimentation outlet is formed between the composite conductive filter screen at the bottom layer of the filter screen holder and the shell wall, the two layers of composite conductive filter screens are respectively connected to the positive and negative poles of a power supply, and the composite conductive filter screens are composed of two layers of stainless steel mesh and a filter cloth layer arranged therebetween;

[0007] The foamed feces enters the shell through the material inlet, and most of the solids in the foamed feces move toward the surface of the water flow reflection baffle due to the inertia of the impact process, and most of the water in the foamed feces moves obliquely upward due to the reflection generated by the impact process. With the continuous addition of material, most of the liquid in the foamed feces overflows upward through the composite conductive filter screen under the pressure of the incoming fluid, and most of the solids in the foamed feces are filtered by the composite conductive filter screen and the influence of gravity and settle down into the bottom of the shell and accumulate. The liquid filtered by the first composite conductive filter screen enters the cavity between the two layers of composite conductive filter screens. The first composite conductive filter screen is fixed to the bottom of the filter screen bracket, and the sedimentation outlet thereon is used to transfer the two composite conductive filters. The precipitate formed in the cavity between the electric filters is discharged, and the second composite conductive filter is fixed on the filter bracket at different heights from the first composite conductive filter according to different process requirements. Under the action of the external electric field, the cations and anions contained in the liquid in the cavity formed by the two composite conductive filters are combined with the cations and anions produced on the surface of the stainless steel mesh to form a precipitate. When the precipitate accumulates to a certain amount, it is blown out from the high-pressure jet nozzle. The blowing material is a gas-liquid mixture containing flocculants or nanoparticles. The precipitate after blowing enters the bottom of the shell through the precipitation outlet, and the liquid after electrochemical impurity removal treatment overflows outward through the overflow outlet. The solid matter deposited at the bottom of the shell is transported outward by the screw conveying pump.

[0008] The voltage intensity of the external electric field is 0.2V~24V, and the angle between the water flow reflection plate and the horizontal plane is 15°~35°.

[0009] The volume ratio of liquid to gas in the liquid mixture is 1:200-400. The liquid contains a flocculant or nanoparticles at a concentration of 0.1-1 mol / L. The flocculant is ferric chloride or phosphate. The nanoparticles are nano iron oxide particles or nano silica gel particles.

[0010] The filter cloth is one of polyester filter cloth, nylon filter cloth, linen filter cloth, polypropylene filter cloth and polytetrafluoroethylene filter cloth.

[0011] The technical solution provided by the present invention has the following beneficial effects:

[0012] 1. Realize solid-liquid separation of bubbled feces: through the action of two-stage composite conductive filter, most of the liquid in the bubbled feces is separated, so that the solid and liquid can be effectively separated and processed;

[0013] 2. High-efficiency filtration and sedimentation: The filter structure and electric field effect can effectively filter out solid particles and suspended matter in the water-soaked feces and precipitate them in the accumulation cavity at the bottom of the device;

[0014] 3. Application of flocculants or nanoparticles: Using high-pressure airflow to spray a gas-liquid mixture containing flocculants or nanoparticles through a high-pressure injection port can promote the sedimentation and separation of solid matter and improve treatment efficiency;

[0015] 4. Electrochemical impurity removal: Using the effect of an external electric field, the cations and anions in the liquid are accelerated to combine with the cations and anions produced on the surface of the stainless steel mesh to form precipitation, thereby further removing impurities in the water-soaked feces;

[0016] 5. Automatic conveying system: Through the screw conveying pump, the solid matter accumulated in the cavity can be conveniently transported out of the device to achieve solid processing and recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the device of the present invention;

[0018] Figure 2 It is a schematic cross-sectional structural diagram of the device of the present invention;

[0019] Figure 3 Schematic diagram of the composite conductive filter structure;

[0020] In the figure: 1- material inlet; 2- water flow reflector; 3- baffle; 4- filter screen bracket; 5- high-pressure injection port; 6- overflow port; 7- screw conveying pump; 8- sedimentation outlet; 9- composite conductive filter screen; 10- stainless steel screen; 11- filter cloth layer. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below by way of examples, but the protection scope of the present invention is not limited to the contents described above.

[0022] like Figure 1-3 As shown, the device used in the following embodiment includes an open shell, a filter screen holder 4 is tilted and arranged on one side of the upper part of the shell, a material inlet 1 is arranged on one side of the filter screen holder 4, a water flow reflection plate 2 is tilted and arranged below the material inlet 1 and the filter screen holder 4, a baffle 3 is tilted and fixed between the water flow reflection plate and the bottom of the shell, two layers of composite conductive filter screens 9 are provided on the filter screen holder 4, a high-pressure injection port 5 is opened on the shell and is located above the composite conductive filter screen 11, an overflow port 6 is opened on the top side of the shell relative to the material inlet, and one or more screw conveying pumps 7 are provided at the bottom of the shell. A sedimentation outlet 8 is formed between the composite conductive filter screen at the bottom layer of the filter screen holder 4 and the shell wall, the two layers of composite conductive filter screens are respectively connected to the positive and negative poles of the power supply, and the composite conductive filter screen 9 is composed of two layers of stainless steel mesh 10 and a filter cloth layer 11 arranged therein;

[0023] The foamed feces enters the shell through the material inlet 1. Most of the solids in the foamed feces are moved to the surface of the water flow reflection baffle 2 by the inertia of the impact process. Most of the water in the foamed feces is moved obliquely upward by the reflection generated by the impact process. As the material is continuously added, most of the liquid in the foamed feces is affected by the pressure of the incoming fluid and overflows upward through the composite conductive filter screen 9. Most of the solids in the foamed feces are filtered by the composite conductive filter screen 9 and the influence of gravity and precipitate downward into the bottom of the shell and accumulate. The liquid filtered by the first composite conductive filter screen enters the cavity between the two layers of composite conductive filter screens 9. The first composite conductive filter screen is fixed to the bottom of the filter screen bracket 4, and the sedimentation outlet 8 thereon is used to separate the two composite conductive filters. The precipitate formed in the cavity between the composite conductive filter screens is discharged, and the second composite conductive filter screen is fixed on the filter screen bracket 4 at different heights from the first composite conductive filter screen according to different process requirements. Under the action of the external electric field, the cations and anions contained in the liquid in the cavity formed by the two composite conductive filter screens are respectively combined with the cations and anions generated on the surface of the stainless steel screen to form a precipitate. When the precipitate accumulates to a certain amount, it is blown out from the high-pressure jet port 5. The blowing material is a gas-liquid mixture containing flocculants or nanoparticles. The precipitate after blowing enters the bottom of the shell through the precipitation outlet 8, and the liquid after electrochemical impurity removal treatment overflows outward through the overflow port 6. The solid matter deposited at the bottom of the shell is transported outward by the screw conveying pump.

[0024] Example 1: In this example, the voltage intensity of the applied electric field is 5 V, the angle between the water flow reflector 2 and the horizontal plane is 15°, the liquid in the gas-liquid mixture is a 0.5 mol / L ferric chloride solution, and the volume ratio of liquid to gas is 1:400; the filter cloth material sandwiched between the stainless steel mesh in the composite conductive filter screen is polyester filter cloth;

[0025] In this embodiment, the blister manure produced by the pig farm was treated, and the blister manure had a COD concentration of 23750 mg / L, a BOD concentration of 8700 mg / L, an ammonia nitrogen concentration of 1375 mg / L, a SS concentration of 18620 mg / L, a pH value of 6.59, and a solid content of 12.5%;

[0026] As shown in the table below, the COD content of the effluent treated by this method and device is 470 mg / L, with a removal rate of 98.02%; the BOD concentration is 103 mg / L, with a removal rate of 98.81%; the ammonia nitrogen concentration is 42 mg / L, with a removal rate of 96.94%; the SS concentration is 317 mg / L, with a removal rate of 98.29%; the pH value is 7.04; and the solid content is 0.12%.

[0027] .

[0028] Example 2: In this example, the voltage intensity of the applied electric field is 10 V, the angle between the water flow reflector and the horizontal plane is 20°; the liquid in the gas-liquid mixture is a 0.5 mol / L sodium phosphate solution, the volume ratio of liquid to gas is 1:300, and the filter cloth sandwiched between the stainless steel mesh is nylon filter cloth;

[0029] In this embodiment, the blister manure from a pig farm was treated, and the blister manure had a COD concentration of 23750 mg / L, a BOD concentration of 8700 mg / L, an ammonia nitrogen concentration of 1375 mg / L, an SS concentration of 18620 mg / L, a pH value of 6.59, and a solid content of 12.5%.

[0030] As shown in the table below, the COD content of the effluent treated by this method and device is 302 mg / L, with a removal rate of 98.72%; the BOD concentration is 75 mg / L, with a removal rate of 99.13%; the ammonia nitrogen concentration is 32 mg / L, with a removal rate of 97.67%; the SS concentration is 141 mg / L, with a removal rate of 99.24%; the pH value is 7.15; and the solid content is 0.09%.

[0031] .

[0032] Example 3: In this example, the voltage intensity of the applied electric field is 15 V, the angle between the water flow reflector and the horizontal plane is 25°; the liquid in the gas-liquid mixture is a 0.5 mol / L nano-iron oxide solution, the volume ratio of liquid to gas is 1:200, and the filter cloth material sandwiched between the stainless steel mesh is a polypropylene filter cloth;

[0033] In this embodiment, the blister manure from a pig farm was treated, and the blister manure had a COD concentration of 23750 mg / L, a BOD concentration of 8700 mg / L, an ammonia nitrogen concentration of 1375 mg / L, an SS concentration of 18620 mg / L, a pH value of 6.59, and a solid content of 12.5%.

[0034] As shown in the table below, the COD content of the effluent treated by this method and device is 97 mg / L, with a removal rate of 99.59%; the BOD concentration is 12 mg / L, with a removal rate of 99.86%; the ammonia nitrogen concentration is 17 mg / L, with a removal rate of 98.76%; the SS concentration is 31 mg / L, with a removal rate of 99.83%; the pH value is 7.34; and the solid content is 0.04%.

[0035] .

Claims

1. A method for solid-liquid separation of blistered feces, characterized in that: The device for completing the method includes an open shell, a filter screen support (4) is tilted and arranged on one side of the upper part of the shell, a material inlet (1) is arranged on one side of the filter screen support (4), a water flow reflection plate (2) is tilted and arranged below the material inlet (1) and the filter screen support (4), a baffle (3) is tilted and fixed between the water flow reflection plate and the bottom of the shell, two layers of composite conductive filter screens (9) are arranged on the filter screen support (4), a high-pressure injection port (5) is opened on the shell and is located above the composite conductive filter screen (9), an overflow port (6) is opened on the top side of the shell relative to the material inlet, and one or more screw conveying pumps (7) are arranged at the bottom of the shell, a sedimentation outlet (8) is formed between the composite conductive filter screen at the bottom layer of the filter screen support (4) and the shell wall, the two layers of composite conductive filter screens are respectively connected to the positive and negative poles of the power supply, and the composite conductive filter screen (9) is composed of two layers of stainless steel mesh (10) and a filter cloth layer (11) arranged therein; The blister manure enters the shell through the material inlet (1). Most of the solids in the blister manure are moved toward the surface of the water flow reflection baffle (2) by the inertial effect of the impact process. Most of the water in the blister manure is moved obliquely upward by the reflection effect generated by the impact process. As the material is continuously added, most of the liquid in the blister manure is affected by the pressure of the incoming fluid and overflows upward through the composite conductive filter (9). Most of the solids in the blister manure are affected by the filtering effect of the composite conductive filter (9) and the influence of gravity and settle downward into the bottom of the shell and accumulate. The liquid filtered by the first composite conductive filter enters the cavity between the two layers of composite conductive filter (9). The first composite conductive filter is fixed to the bottom of the filter bracket (4). The sedimentation outlet (8) on it is used to separate the two layers of the blister manure. The precipitate formed in the cavity between the two composite conductive filter screens is discharged, and the second composite conductive filter screen is fixed on a filter screen bracket (4) at a different height from the first composite conductive filter screen according to different process requirements. Under the action of an external electric field, the cations and anions contained in the liquid in the cavity formed by the two composite conductive filter screens are combined with the cations and anions generated on the surface of the stainless steel screen to form precipitates. When the precipitate accumulates to a certain amount, it is blown out from the high-pressure injection port (5). The blowing material is a gas-liquid mixture containing flocculants or nanoparticles. The precipitate after blowing enters the bottom of the shell through the precipitation outlet (8). The liquid after electrochemical impurity removal treatment overflows outward through the overflow port (6). The solid matter deposited at the bottom of the shell is transported outward by a screw conveying pump. The nanoparticles are nano iron oxide particles or nano silica gel particles.

2. The method for solid-liquid separation of blistered feces according to claim 1, wherein: The voltage intensity of the applied electric field is 0.2V~24V.

3. The method for solid-liquid separation of blistered feces according to claim 1, characterized in that: The angle between the water reflection plate and the horizontal plane is 15°~35°.

4. The method for solid-liquid separation of blistered feces according to claim 1, wherein: The volume ratio of liquid to gas in the gas-liquid mixture is 1:200~400.

5. The method for solid-liquid separation of blistered feces according to claim 4, characterized in that: The liquid is a liquid containing flocculants or nanoparticles with a concentration of 0.1~1 mol / L, and the flocculants are ferric chloride and phosphate.

6. The method for solid-liquid separation of blistered feces according to claim 1, characterized in that: The filter cloth is one of polyester filter cloth, nylon filter cloth, linen filter cloth, polypropylene filter cloth and polytetrafluoroethylene filter cloth.

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