Device for heavy metal polluted livestock and poultry manure biogas residues
By using an electrolytic cell device combined with leachate and electro-chelation PRB technology to treat livestock and poultry manure biogas residue, the problem of heavy metal pollution has been solved, the harmless utilization of manure biogas residue has been achieved, and environmental risks have been reduced.
Patent Information
- Application Number
- CN202411681773.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-12-12
AI Technical Summary
Existing technologies cannot effectively reduce the heavy metal content in livestock and poultry manure biogas residue, which poses an environmental risk of re-release after entering farmland, affecting the quality and safety of agricultural products and human health.
An electrolytic cell device is used, combined with leachation technology and electric chelation PRB technology. Using titanium alloy electrode plates and heavy metal adsorption materials, heavy metals are removed from the leachate of livestock and poultry manure residue through electrolysis and filtration.
This method achieves the harmless treatment of livestock and poultry manure and biogas residue. The treated solids can be used as composting raw materials, and the waste liquid can be used as biogas slurry fertilizer, thus reducing environmental risks.
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of livestock manure biogas residue, and particularly relates to a device for livestock manure biogas residue contaminated by heavy metals. BACKGROUND
[0002] Unreasonable use of feed additives in livestock breeding has caused high residual problems of heavy metals in manure. Investigations show that the heavy metals in livestock manure are mainly Cu, Zn and Cd, and the content of heavy metals in pig manure is generally higher than that in chicken manure. The concentrations of Cu and Zn in pig manure are as high as hundreds or even thousands of mg / kg. Cd is the primary contaminant of soil in China, and the content of Cd in feed crops grown in acid soil in the southern part of China is relatively high. These feed crops are eaten by animals, which also leads to excessive content of Cd in livestock manure. Reducing Cd in livestock manure biogas residue and biogas slurry and controlling the input of Cd in agricultural inputs in farmland are directly related to the quality and safety of agricultural products and human health in China. Anaerobic digestion and aerobic composting are the main technical processes for treating livestock manure in the prior art, but the above technical means cannot reduce the total amount of heavy metals, and the passivated heavy metals still exist in the environment and may be released again after entering farmland with organic fertilizer. Therefore, a device is needed to remove heavy metals in leaching solution. SUMMARY
[0003] The purpose of the present application is to provide a device for livestock manure biogas residue contaminated by heavy metals to solve the problems in the background art.
[0004] To achieve the above purpose, the present application provides the following technical scheme: a device for livestock manure biogas residue contaminated by heavy metals, comprising an electrolytic cell, the electrolytic cell is divided into a treatment chamber, a PRB and an anode chamber from left to right, a titanium alloy electrode plate one is arranged in the treatment chamber, sintered glass is arranged on both sides of the PRB, the PRB is provided with a heavy metal adsorption material one, a titanium alloy electrode plate two is arranged in the anode chamber, the titanium alloy electrode plate one and the titanium alloy electrode plate two are connected to the negative electrode and the positive electrode of a power supply respectively, and the treatment chamber is connected to an air pump.
[0005] Preferably, leaching waste liquid is placed in the treatment chamber and the anode chamber.
[0006] Preferably, the leaching waste liquid is obtained by adding 0.01 mol / L Na2EDTA solution to livestock manure biogas residue at a solid-liquid ratio of 1:5, stirring at 180 rpm at room temperature for 20 min, and then performing solid-liquid separation to obtain the waste liquid.
[0007] Preferably, the air pump is connected to an inlet pipe, the inlet pipe is connected to a cylindrical filter box and is provided with a valve I, the filter box is provided with a motor above, the motor is connected to a screw rod, the filter box is provided with a cover plate I on the left and right sides, the filter box is provided with an arc plate on the inner wall of the upper portion, the filter box is provided with a cover plate II below the right cover plate I, the filter box is provided with an outlet pipe at the bottom, the outlet pipe is provided with a valve II, and the screw rod is provided with a filtering device.
[0008] Preferably, the filtering device comprises a connecting ring I connected with the screw rod, the connecting ring I is sequentially provided with a connecting ring II, a connecting ring III, a connecting ring IV and the screw rod from top to bottom, the connecting ring I is hinged to a plurality of connecting rods I on one side, the other side of the connecting rod I is fixedly connected to a support rod I, the support rod I is hinged to the connecting ring II on the side, the support rod I is provided with a connecting plate I between the support rods, the connecting ring III is hinged to a plurality of support rods II on one side, the other side of the support rod II is connected to an elastic cloth I, the lower end of the support rod II is fixedly connected to one side of a connecting rod II, the other side of the connecting rod II is hinged to the connecting ring IV, and the support rods II are provided with a connecting plate II.
[0009] Preferably, the connecting ring III is further provided with an elastic cloth II above the support rod II on one side.
[0010] Preferably, the connecting rod I rotates and contacts the arc plate.
[0011] Preferably, when the screw rod rotates forward, the connecting ring I moves downward, the connecting ring IV moves upward, and the connecting ring II and the connecting ring III are located at the initial position; when the screw rod reverses, the connecting ring I moves upward, the connecting ring IV moves downward, and the connecting ring II and the connecting ring III are located at the initial position.
[0012] Preferably, the support rod I and the connecting plate II are provided with a heavy metal adsorption material II below.
[0013] Preferably, when the support rod I and the support rod II are both rotated to be perpendicular to the screw rod, the heavy metal adsorption material II contacts the connecting plate II.
[0014] The technical effect and advantage of the present application: the present application provides a complete livestock manure biogas residue heavy metal removal technical method and equipment, that is, the leaching technology and the electric chelation PRB technology are organically combined. The treated livestock manure biogas residue solid can be directly used as a compost raw material, the leaching waste liquid can be used as biogas slurry after electrolysis and filtration, and the livestock manure biogas residue is harmlessly treated, and the environmental risk of manure is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 The schematic diagram of the present application; Figure 2The effect diagram of the leaching agent type of the present application on the removal of heavy metals in the solid phase of livestock and poultry manure / methane residue; Figure 3 The effect diagram of the Na2EDTA concentration of the present application on the removal of heavy metals in the solid phase of livestock and poultry manure / methane residue; Figure 4 The effect diagram of the leaching time of the present application on the removal of heavy metals in the solid phase of livestock and poultry manure / methane residue; Figure 5 The effect of solid-liquid ratio on the removal of heavy metals in the solid phase of livestock and poultry manure / methane residue; Figure 6 The schematic diagram of the filter box of the present application Figure 7 The schematic diagram of the filter box of the present application Figure 6 The local enlarged view of part A of the present application Figure 8 The internal upper end plan view of the filter box of the present application Figure 9 The internal lower end plan view of the filter box of the present application
[0016] In the figure: 1100 electrolytic cell, 110 treatment chamber, 120 PRB, 130 anode chamber, 200 titanium alloy electrode plate one, 210 titanium alloy electrode plate two, 220 power supply, 300 sintered glass, 310 heavy metal adsorption material one, 400 inlet pipe, 410 valve one, 500 filter box, 510 arc plate, 520 cover plate one, 530 cover plate two, 540 outlet pipe, 550 valve two, 600 motor, 610 screw rod, 700 connecting ring one, 710 connecting rod one, 720 supporting rod one, 721 connecting plate one, 730 heavy metal adsorption material two, 740 connecting ring two, 800 connecting ring three, 810 supporting rod two, 811 connecting plate two, 820 elastic cloth one, 830 elastic cloth two, 840 connecting rod two, 850 connecting ring four. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0018] As Figures 1-4The device shown is for treating livestock and poultry manure sludge contaminated with heavy metals. It includes an electrolytic cell 100, which is divided into three areas from left to right: a treatment chamber 110, a PRB 120, and an anode chamber 130. The treatment chamber 110 is equipped with a titanium alloy electrode plate 200 and sintered glass 300 on both sides of the PRB 20. The PRB 120 is equipped with a heavy metal adsorbent material 310. The anode chamber 130 is equipped with a titanium alloy electrode plate 210. The titanium alloy electrode plate 200 and the titanium alloy electrode plate 210 are respectively connected to the negative and positive terminals of a power supply 220. The treatment chamber 110 is connected to an air pump.
[0019] In some specific embodiments of the present invention, both the processing chamber 110 and the anode chamber 130 contain leaching waste liquid.
[0020] In some specific embodiments of the present invention, the leaching waste liquid is obtained by adding 0.01 mol / L Na2EDTA solution to livestock and poultry manure biogas residue at a solid-liquid ratio of 1:5, stirring at 180 rpm at room temperature for 20 min, and then performing solid-liquid separation.
[0021] Depend on Figure 2 It can be seen that EDTA and Na2EDTA are significantly better than other types of extractants in removing heavy metals from livestock and poultry manure / biogas residue. Since Na2EDTA is more water-soluble than EDTA, Na2EDTA is chosen in practical applications.
[0022] Depend on Figure 3 It was found that the optimal concentrations of the extractant Na2EDTA were 0.01, 0.03, 0.06, 0.1, and 0.2 mol / L, with a solid-liquid ratio of 1:10. Extraction was performed at room temperature and 180 rpm for 4 h. Solid-liquid separation was then carried out by centrifugation, and the heavy metal content in the solid was determined.
[0023] At the same time, by Figure 3 As shown, the removal rate of heavy metals from livestock and poultry manure / biogas residue increases significantly with increasing Na2EDTA concentration, with a greater impact on Cd and Zn. However, increasing the Na2EDTA concentration also lowers the pH of livestock and poultry manure / biogas residue and increases economic costs. Therefore, considering all factors, the optimal Na2EDTA concentration is determined to be between 0.01 and 0.03 mol / L.
[0024] By setting the extraction time to 0.5, 1, 2, 4, 8, 12 and 24 h, using Na2EDTA as the extraction agent with a concentration of 0.1 mol / L, and a solid-liquid ratio of 1:10, solid-liquid separation was performed by centrifugation, and the heavy metal content in the solid was determined.
[0025] Depend on Figure 4As shown, with the increase of leaching time, the removal effect of Na2EDTA on heavy metals in livestock manure and biogas residue showed a trend of rapid increase and then tended to be flat, and the rapid increase stage was between 0~0.5 h. Considering the time cost, the optimal leaching time was determined to be between 0~0.5 h.
[0026] The solid-liquid ratio was set to 1:5, 1:7 and 1:10, the leaching agent was Na2EDTA with a concentration of 0.1 mol / L, and the leaching was carried out at room temperature and 180 rpm for 4 h. The solid-liquid separation was carried out by centrifugation, and the heavy metal content in the solid was determined.
[0027] As shown in Figure 5 There was no obvious difference between the three solid-liquid ratios, and the smaller the solid-liquid ratio, the less the amount of leaching waste liquid produced, so the optimal solid-liquid ratio was determined to be around 1:5.
[0028] Therefore, the livestock manure and biogas residue was finally determined to be added to the 0.01 mol / L Na2EDTA solution with a solid-liquid ratio of 1:5, stirred at 180 rpm and room temperature for 20 min, and then the waste liquid was put into the treatment chamber 110 and the anode chamber 130 for electrolysis. The PRB 120 was used to adsorb heavy metals in the treatment chamber 110, and the waste liquid in the treatment chamber 110 was filtered after treatment.
[0029] As shown in Figures 5-9 The gas pump is connected to the inlet pipe 400, the inlet pipe 400 is connected to the cylindrical filter box 500 and is provided with a valve 410, the filter box 500 is provided with a motor 600 above, the motor 600 is connected to a screw rod 610, the filter box 500 is provided with a cover plate 520 on the left and right sides, the filter box 500 is provided with an arc plate 510 on the inner wall of the upper part, the right cover plate 520 is provided with a cover plate 530 below, the filter box 500 is provided with an outlet pipe 540 at the bottom, the outlet pipe 540 is provided with a valve 550, and the screw rod 610 is provided with a filter device.
[0030] The gas pump can pump the waste liquid in the treatment chamber 110 into the filter box 500, the motor 600 can rotate forward and reverse, and the cover plate 520 and the cover plate 530 can be artificially installed and removed.
[0031] In some embodiments of the present application, the filtering device comprises a connecting ring one 700 connected with the screw rod 610, the connecting ring one 700 is sequentially provided with a connecting ring two 740, a connecting ring three 800, a connecting ring four 850 and the screw rod 610 from top to bottom, the connecting ring one 700 is hingedly connected with a plurality of connecting rods one 710 on one side, the connecting rods one 710 are fixedly connected with support rods one 720 on the other side, the support rods one 720 are hingedly connected with the connecting ring two 740 on the side edge, the support rods one 720 are provided with connecting plates one 721 between them, the connecting ring three 800 is hingedly connected with a plurality of support rods two 810 on one side, the support rods two 810 are connected with elastic cloths one 820 on the other side, the support rods two 810 are fixedly connected with connecting rods two 840 on the lower end on one side, the connecting rods two 840 are hingedly connected with the connecting ring four 850 on the other side, and the support rods two 810 are provided with connecting plates two 811 connected between them, and the connecting plates two 811 are filtering plates.
[0032] The connecting ring two 740 and the connecting ring four 850 can move up and down on the screw rod 610, thereby driving the support rods one 720 and the support rods two 810 to rotate, the elastic cloths one 820 have a certain elasticity, and can be stretched or contracted when the support rods two 810 rotate, thereby playing a sealing role, preventing waste liquid from flowing down the inner wall of the filtering box 500, and the rotation of the support rods two 810 can prevent the filtering plates 811 from being blocked.
[0033] In some embodiments of the present application, the connecting ring three 800 is further provided with elastic cloths two 830 above the support rods two 810 on one side.
[0034] The elastic cloths two 830 are arranged to cover the gap between the connecting ring three 800 and the support rods two 810, thereby preventing waste liquid from flowing down through the gap.
[0035] In some embodiments of the present application, the connecting rods one 710 are in contact with the arc-shaped plates 510 when rotating.
[0036] The connecting rods one 710 are in contact with the arc-shaped plates 510 when rotating, which can scrape off heavy metals and impurities remaining on the inner wall of the arc-shaped plates 510, thereby facilitating cleaning and solving the problem of inconvenient cleaning of the inner wall of the filtering box 500.
[0037] In some embodiments of the present application, the connecting ring one 700 moves downward, the connecting ring four 850 moves upward, and the connecting ring two 740 and the connecting ring three 800 are located at the initial position when the screw rod 610 rotates in the forward direction, and the connecting ring one 700 moves upward, the connecting ring four 850 moves downward, and the connecting ring two 740 and the connecting ring three 800 are located at the initial position when the screw rod 610 rotates in the reverse direction.
[0038] When the screw 610 rotates forward, the connecting ring one 700 moves downward, the connecting ring two 740 is in the initial position, the connecting ring one 700 drives the support rod one 720 to move downward, thereby driving the connecting plate one 721 to move downward, and the connecting ring four 850 drives the connecting plate two 811 to move upward.
[0039] In some embodiments of the present application, the support rod one 720 and the connecting plate one 721 are provided below with the heavy metal adsorption material two 730.
[0040] In some embodiments of the present application, when the support rod one 720 and the support rod two 810 are both rotated to be perpendicular to the screw 610, the heavy metal adsorption material two 730 is in contact with the connecting plate two 811.
[0041] When the support rod one 720 and the support rod two 810 are both rotated to be perpendicular to the screw 610, the heavy metal adsorption material two 730 can adsorb the heavy metal filtered by the connecting plate two 811, and then the heavy metal is cleaned through the cover plate one 520, and the remaining impurities can be cleaned through the cover plate two 530.
[0042] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of protection of the present application.
Claims
1. A device for treating heavy metal-contaminated livestock and poultry manure biogas residue, comprising an electrolytic cell (100), characterized in that: The electrolytic cell (100) is divided into three areas from left to right: a processing chamber (110), a PRB (120), and an anode chamber (130). The processing chamber (110) is equipped with a titanium alloy electrode plate 1 (200), and the PRB (120) is surrounded by sintered glass (300). The PRB (120) is equipped with a heavy metal adsorption material 1 (310). The anode chamber (130) is equipped with a titanium alloy electrode plate 2 (210). The titanium alloy electrode plate 1 (200) and the titanium alloy electrode plate 2 (210) are respectively connected to the negative and positive terminals of the power supply (220). The processing chamber (110) is connected to an air pump.
2. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 1, characterized in that: The leaching waste liquid is placed in both the treatment chamber (110) and the anode chamber (130).
3. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 2, characterized in that: The leaching waste liquid is obtained by adding 0.01 mol / L Na2EDTA solution to livestock and poultry manure biogas residue at a solid-liquid ratio of 1:5, stirring at 180 rpm at room temperature for 20 min, and then performing solid-liquid separation.
4. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 1, characterized in that: The air pump is connected to the inlet pipe (400), the inlet pipe (400) is connected to the cylindrical filter box (500) and is equipped with valve one (410), the filter box (500) is equipped with a motor (600) above it, the motor (600) is connected to the screw (610), the filter box (500) is equipped with cover plate one (520) on the left and right sides, the filter box (500) is equipped with an arc plate (510) on the upper inner wall, and cover plate two (530) is provided below cover plate one (520) on the right side. The filter box (500) is equipped with an outlet pipe (540) at the bottom, the outlet pipe (540) is equipped with valve two (550), and the screw (610) is equipped with a filter device.
5. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 4, characterized in that: The filter device includes a connecting ring 1 (700) connected to a screw (610). The connecting ring 1 (700) has connecting ring 2 (740), connecting ring 3 (800), and connecting ring 4 (850) connected to the screw (610) from top to bottom. The connecting ring 1 (700) is hinged to one side of several connecting rods 1 (710). The other side of the connecting rods 1 (710) is fixedly connected to a support rod 1 (720). The side of the support rod 1 (720) is hinged to connecting ring 2 (740). A connecting plate 1 (721) is provided between the support rods 1 (720). The connecting ring 3 (800) is hinged to one side of several support rods 2 (810). The other side of the support rods 2 (810) is connected to elastic cloth 1 (820). The lower end of the support rods 2 (810) is fixedly connected to one side of the connecting rod 2 (840). The other side of the connecting rods 2 (840) is hinged to the connecting ring 4 (850). The support rods 2 (810) are connected by a connecting plate 2 (811), which is a filter plate.
6. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 5, characterized in that: Elastic cloth 2 (830) is also provided above one side of the hinged support rod 2 (810) of the connecting ring 3 (800).
7. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 5, characterized in that: When the connecting rod (710) rotates, it comes into contact with the arc plate (510).
8. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 5, characterized in that: When the screw (610) rotates forward, the first connecting ring (700) moves downward, the fourth connecting ring (850) moves upward, and the second connecting ring (740) and the third connecting ring (800) are in their initial positions. When the screw (610) rotates in reverse, the first connecting ring (700) moves upward, the fourth connecting ring (850) moves downward, and the second connecting ring (740) and the third connecting ring (800) are in their initial positions.
9. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 5, characterized in that: Heavy metal adsorption material 2 (730) is provided below the support rod 1 (720) and the connecting plate 1 (721).
10. The device for treating heavy metal-contaminated livestock and poultry manure biogas residue according to claim 9, characterized in that: When both the first support rod (720) and the second support rod (810) are rotated to be perpendicular to the screw (610), the second heavy metal adsorbent material (730) comes into contact with the second connecting plate (811).