CN112897829A - Equipment and method for removing heavy metals by weak-current-assisted reduction of liquid state fecal sewage iron electrode of cage-cultured laying ducks - Google Patents
Equipment and method for removing heavy metals by weak-current-assisted reduction of liquid state fecal sewage iron electrode of cage-cultured laying ducks Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C02F11/00—Treatment of sludge; Devices therefor
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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Abstract
The invention provides a device and a method for removing heavy metal by reducing liquid state excrement and sewage iron electrodes of cage-cultured laying ducks assisted by weak current, belongs to the field of high heavy metal content excrement and sewage treatment of the cage-cultured laying ducks, and relates to a device for removing heavy metal by reducing liquid state excrement and sewage iron electrodes of the cage-cultured laying ducks assisted by weak current, which comprises the following steps: the settling pond is configured to settle liquid dung of the cage-reared laying ducks to obtain low-solid-content wastewater and sludge; the flocculation clarification tank is configured to flocculate and clarify the low-solid-content wastewater to obtain flocculation sediment and flocculated wastewater; and the weak current auxiliary iron electrode reduction pool is configured to reduce the flocculated wastewater to remove heavy metals. The method can treat the liquid manure of the cage-cultured laying ducks with high water content and high heavy metal content, and realizes water-fertilizer integrated farmland irrigation of duck-culturing wastewater.
Description
Technical Field
The invention belongs to the field of treatment of high-heavy-metal-content excrement of cage-cultured laying ducks, and particularly relates to weak-current-assisted equipment and a method for removing heavy metals by reduction of liquid-state excrement iron electrodes of cage-cultured laying ducks.
Background
The cage-rearing laying duck is an advanced technology for controlling the breeding pollution of the laying duck, but the moisture content of excrement generated by the cage-rearing laying duck is very high, the excrement is liquid and thin paste with strong liquidity, the collection and the transportation are inconvenient, and the excrement treatment mode of the traditional breeding industry is difficult to directly apply. On the other hand, according to different feeding conditions, the discharged liquid manure contains more heavy metals such as copper, zinc, cadmium, mercury and the like, so that the liquid manure cannot be directly used as organic fertilizer for irrigation, and the recycling of the liquid manure is seriously influenced.
Disclosure of Invention
Based on the situation, one of the purposes of the invention is to provide weak-current-assisted equipment for removing heavy metal by reducing liquid state excrement iron electrodes of the cage-cultured laying ducks, the structural arrangement of the equipment is reasonable, the equipment is used for cage-cultured laying ducks, and the power consumption and the energy consumption are very low.
The invention also aims to provide a weak-current-assisted method for removing heavy metals by reducing liquid state excrement iron electrodes of cage-cultured laying ducks.
In order to solve the above technical problems, the present invention adopts the following scheme,
the invention provides a cage-rearing weak-current-assisted device for removing heavy metal by reducing liquid state excrement iron electrode of laying ducks, comprising:
the settling pond is configured to settle liquid dung of the cage-reared laying ducks to obtain low-solid-content wastewater and sludge;
the flocculation clarification tank is configured to flocculate and clarify the low-solid-content wastewater to obtain flocculation sediment and flocculated wastewater;
and the weak current auxiliary iron electrode reduction pool is configured to reduce the flocculated wastewater to remove heavy metals.
Further, a first flow guide device is arranged between the sedimentation tank and the flocculation clarification tank, so that the low-solid-content wastewater in the sedimentation tank can be guided into the flocculation clarification tank; a second flow guide device is arranged between the flocculation settling tank and the weak current auxiliary iron electrode reduction tank, so that the wastewater after flocculation in the flocculation settling tank can be guided into the weak current auxiliary iron electrode reduction tank;
further, a height difference is arranged between the sedimentation tank and the flocculation clarification tank, so that the low-solid-content wastewater can enter the flocculation clarification tank from the sedimentation tank in an overflow mode; and a height difference is arranged between the flocculation clarification tank and the weak current auxiliary iron electrode reduction tank, so that the flocculated wastewater can enter the weak current auxiliary iron electrode reduction tank from the flocculation clarification tank in an overflow mode.
Further, the sedimentation tank is also provided with a liquid manure inlet for introducing liquid manure of the cage-reared laying ducks and a sludge outlet for discharging the sludge, and the sludge outlet is vertically lower than the first flow guide device;
further, the sludge outlet is connected with a sludge recovery tank through a pipeline, so that the sludge in the sedimentation tank can be discharged into the sludge recovery tank;
further, a mud pump is arranged on the pipeline.
Furthermore, a gentle slope is further arranged in the sedimentation tank, and the gentle slope inclines from one side of the excrement inlet to one side of the sludge outlet.
Furthermore, a flocculation reagent box is arranged on one side of the flocculation settling pond and used for adding a flocculating agent into the flocculation settling pond, a three-layer rotating blade stirrer is arranged in the flocculation settling pond, the flocculation settling pond is provided with a conical bottom, and a flocculation precipitation outlet used for discharging the flocculation precipitation is arranged at the lowest position of the conical bottom;
further, be provided with first fender in the flocculation clarification tank, first fender set up in the three-layer changes the leaf agitator with be used for blockking between the first guiding device the mud in the flocculation clarification tank flows to the second guiding device.
Furthermore, an electrode assembly is arranged in the weak-current auxiliary iron electrode reduction pool, the weak-current auxiliary iron electrode reduction pool is provided with a conical bottom, the lowest part of the conical bottom is provided with a sludge outlet, and the side wall of the weak-current auxiliary iron electrode reduction pool, which is far away from the second flow guide device, is provided with a purified water outlet;
furthermore, a second baffle is arranged in the weak current auxiliary iron electrode reduction pool, and the second baffle is arranged between the electrode assembly and the purified water outlet and is used for blocking the sludge in the weak current auxiliary iron electrode reduction pool from flowing to the purified water outlet.
The invention also provides a method for removing heavy metals by reducing the liquid state excrement iron electrode of the cage-rearing laying ducks with weak current assistance, which comprises the following steps:
1) primary precipitation: naturally settling the collected liquid dung of the cage-rearing laying ducks to obtain low-solid-content wastewater and sludge;
2) flocculation clarification: filtering the low-solid-content wastewater by a filter screen, and adding a flocculating agent for flocculation treatment to obtain flocculation precipitation and flocculated wastewater;
3) and (3) carrying out reduction by using a weak current auxiliary iron electrode to remove heavy metals: and reducing the flocculated wastewater by adopting a weak current auxiliary iron electrode, so that heavy metal ions in the flocculated wastewater are reduced on a polar plate under the assistance of weak current, and thus removing the high-content heavy metal in the wastewater.
Sludge recovery: and mixing the sludge with agricultural wastes, and performing composting fermentation to obtain an organic fertilizer so as to passivate heavy metals in the sludge. The recovered sludge contains a large amount of organic matters and part of organic combined heavy metals, and the sludge can be mixed with clay minerals and lime and then sintered to passivate the heavy metals and produce the hollow clay brick building material.
Furthermore, the device adopted by the method is the weak current-assisted device for removing heavy metal by reduction of the liquid state dung and dirt iron of the cage-rearing laying ducks.
Further, the filter screen is detachable multilayer filter screen, the mesh number of filter screen is 40 meshes, 60 meshes, 80 meshes and 100 meshes in proper order.
Further, the flocculating agent comprises at least one of ferrous sulfate, polymeric ferric sulfate and polymeric ferric aluminum sulfate, and the flocculating agent is preferably used for the best flocculation effect of the polymeric ferric sulfate, and the using amount can be 400-600 mg/L.
Furthermore, the weak current auxiliary conditions are that the electrifying voltage is controlled to be 25-30V, the current is controlled to be 0.5-2.5A, and the electrifying time is controlled to be 0.5-1 h.
Further, the heavy metal is at least one of Zn, Cu, Cd and Hg.
Compared with the prior art, the invention has the following beneficial effects: the heavy metal removing device through the weak current assisted reduction of the liquid dung iron electrode of the cage-reared laying duck can realize the recovery and heavy metal removal of the liquid dung with high water content and high heavy metal content generated in the process of cage-reared laying duck, and the resource utilization of the dung of the cage-reared laying duck is achieved. Firstly, dry-wet separation of liquid dung is realized to a certain extent by a gentle slope sedimentation mode, the moisture content of recovered sludge is greatly reduced, and the liquid dung is divided into two parts of wastewater and sludge to be respectively treated. The waste water part is flocculated, clarified and reduced in turbidity and improved in conductivity, and then is subjected to weak current auxiliary iron electrode reduction to remove residual heavy metals, so that the waste water is discharged up to the standard or is used for harmless treatment such as agricultural irrigation and the like, and the water-fertilizer integrated farmland irrigation of the duck breeding waste water is realized. The recovered sludge contains a large amount of organic matters and part of organic combined heavy metals, and the sludge is mixed with clay minerals and lime and then sintered to passivate the heavy metals and produce the hollow clay brick building material.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic structural diagram of a device for removing heavy metals by reduction of liquid state iron excrement of cage-reared laying ducks by weak current assistance in an embodiment of the invention;
in the figure, a liquid manure collecting pipeline 1, a sedimentation tank 2, a gentle slope 21, a liquid manure inlet 22, a sludge outlet 23, a flocculation clarification tank 3, a flocculation reagent box 31, a three-layer rotating blade stirrer 32, a flocculation precipitation outlet 33, a first mudguard 34, a weak current auxiliary iron electrode reduction tank 4, an electrode assembly 41, a reduction precipitation outlet 42, a purified water outlet 43, a second mudguard 44, a slurry pump 5, a sludge recovery tank 6, a first flow guide device 7 and a second flow guide device 8.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for the convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present application.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Example 1: cage-rearing weak-current-assisted egg duck liquid manure iron-polluted electrode reduction heavy metal removal equipment
The embodiment aims to provide the cage-rearing weak-current-assisted device for removing heavy metal by reducing the liquid state excrement iron electrode of the laying duck, as shown in figure 1, firstly, liquid state excrement of the cage-rearing laying duck with high water content and high heavy metal content is discharged into a sedimentation tank 2 through a liquid state excrement collection pipeline 1, and the liquid state excrement is settled in the sedimentation tank 2 to obtain low-solid-content wastewater and sludge; the low solid content waste water further reduces the waste water turbidity through the flocculation of flocculation clarification tank 3, improves the conductivity, and the waste water after the gained flocculation directly is used for the field irrigation after weak current assists iron electrode reduction tank 4 and gets rid of the heavy metal.
The cage-rearing laying duck breeding method belongs to a large-scale breeding technology, and can be optimally set for realizing continuous treatment of liquid dung of cage-rearing laying ducks, wherein a first flow guide device 7 is arranged between a sedimentation tank 2 and a flocculation clarification tank 3, so that low-solid-content wastewater in the sedimentation tank 2 can be guided into the flocculation clarification tank 3; the end part of the first flow guide device 7, which is positioned at one side of the sedimentation tank 2, is provided with a plurality of layers of filter screens in a detachable design, and the mesh number of the filter screens is 40 meshes, 60 meshes, 80 meshes and 100 meshes in sequence; a second flow guide device 8 is arranged between the flocculation settling pond 3 and the weak current auxiliary iron electrode reduction pond 4, so that the wastewater after flocculation in the flocculation settling pond 2 can be guided into the weak current auxiliary iron electrode reduction pond 4; the first flow guide device 7 and the second flow guide device 8 can select the design of a pipeline in the specific implementation process, and a valve can be arranged on the pipeline to control the flow; a height difference is arranged between the sedimentation tank 2 and the flocculation clarification tank 3, so that the low-solid-content wastewater can enter the flocculation clarification tank 3 from the sedimentation tank 2 in an overflow mode; and a height difference is arranged between the flocculation clarification tank 3 and the weak current auxiliary iron electrode reduction tank 4, so that the flocculated wastewater can enter the weak current auxiliary iron electrode reduction tank 4 from the flocculation clarification tank 3 in an overflow mode.
The sedimentation tank 2 is used for realizing the preliminary separation of solid and liquid in the liquid dung of the cage-reared laying ducks, and particularly, the sedimentation tank 2 is also provided with a liquid dung inlet 22 for leading in the liquid dung of the cage-reared laying ducks and a sludge outlet 23 for discharging the sludge, and the height of the sludge outlet 23 in the vertical direction is lower than that of the first flow guide device 7; the sludge outlet 23 is connected with the sludge recovery tank 6 through a pipeline, so that the sludge in the sedimentation tank 2 can be discharged into the sludge recovery tank 6, and the pipeline is provided with a mud pump 5 which can discharge the sludge precipitated in the sedimentation tank 2 into the sludge recovery tank 6 periodically through the operation of the mud pump 5. In the preferred embodiment mode, still be provided with gentle slope 21 in the sedimentation tank 2, gentle slope 21 by dirty entry one side of excrement to mud export 23 one side slope can collect 23 departments at mud better to the mud in sedimentation tank 2 on the one hand, and on the other hand can improve the dirty settlement effect of egg duck liquid excrement through the increase mud area of subsiding.
The flocculation clarification tank can further reduce the turbidity of the wastewater and improve the conductivity through the flocculation clarification effect, and is favorable for the subsequent reduction of the weak current auxiliary iron electrode. The invention provides the following concrete embodiment to achieve the above flocculation purpose, one side of the flocculation clarification tank 3 is provided with a flocculation reagent box 31 for adding a flocculating agent into the flocculation sedimentation tank, and a metering control pump is arranged on a connecting pipeline of the flocculation reagent box 31 and the flocculation clarification tank 3 to control the adding of the flocculating agent; be provided with three-layer rotating vane agitator 32 in the flocculation and sedimentation tank, the flocculation and sedimentation tank has the toper bottom, the lowest department of toper bottom is provided with and is used for discharging flocculation and sedimentation's flocculation and sedimentation export 33.
In order to prevent the flocculation and precipitation in the flocculation and clarification tank 3 from entering the weak current auxiliary iron electrode reduction tank 4 along with the wastewater under the stirring action, a first splash guard 34 is arranged in the flocculation and clarification tank 3, and the first splash guard 34 is arranged between the three-layer rotating blade stirrer 32 and the first flow guide device 7.
An electrode assembly 41 is arranged in the weak-current auxiliary iron electrode reduction cell 4, in a specific embodiment, the anode of the electrode assembly 41 adopts an iron electrode, the cathode adopts a graphite electrode, the electrodes adopt a unipolar connection, 3 anodes are connected in parallel with the positive electrode of a power supply, and 3 cathodes are connected in parallel with the negative electrode of the power supply.
The weak-current auxiliary iron electrode reduction pool 4 is provided with a conical bottom, the lowest part of the conical bottom is provided with a reduced precipitate outlet 42, and the side wall of the weak-current auxiliary iron electrode reduction pool 4, which is far away from the second flow guide device 8, is provided with a purified water outlet 43; a second sludge baffle 44 is arranged in the weak current auxiliary iron electrode reduction tank 4, and the second sludge baffle 44 is arranged between the electrode assembly 41 and the purified water outlet 43 and is used for blocking the sludge in the weak current auxiliary iron electrode reduction tank 4 from flowing to the purified water outlet 43.
Example 2: method for removing heavy metals by cage-cultured weak-current-assisted reduction of liquid state dung and sewage electrodes of laying ducks
500L (pH9.8, the water content is 87 percent, and the Zn content is 35.7mg/L) of high-zinc-content liquid dung discharged by a cage-rearing laying duck farm is input into a gentle slope sedimentation tank through a liquid dung collection pipeline, after natural sedimentation on a gentle slope, the solid content of the waste water at the upper end outlet of the gentle slope sedimentation tank is reduced to 3.4 percent, the solid content of the waste water is detected at the inlet end of a flocculation clarification tank after the waste water is continuously filtered by a filter screen and is reduced to 2.6 percent, and the Zn content is reduced to 17 mg/L. And (3) putting 500mg/L of polymeric ferric sulfate into the flocculation clarification tank through a flocculation reagent box, stirring at the rotating speed of 60r/min for 30min, and then shutting down the machine to flocculate and precipitate the wastewater. The turbidity of the flocculated wastewater is greatly reduced, the solid content of the wastewater is reduced to be below 0.01 percent and the Zn content is reduced to 9.4mg/L when the detection is carried out at the outlet of the flocculation clarification tank. Inputting the clarified waste liquid into a weak-current auxiliary iron electrode reduction pool, wherein the electrodes of the weak-current auxiliary iron electrode reduction pool are connected in a single-pole manner, 3 anodes are connected in parallel with the anode of a power supply, and 3 cathodes are connected in parallel with the cathode of the power supply. The voltage of the current is set to 35V, the current is controlled to be about 1A, and the current is electrified for 1 h. And after the electrification is finished, emptying the waste liquid, and then turning off the power supply, and measuring that the Zn content in the discharged waste liquid is reduced to 1.4mg/L, so that the discharge standard is met. In addition, the nitrogen removal rate of the waste liquid ammonia reaches 31 percent and the COD removal rate reaches 94 percent.
Example 3: method for removing heavy metals by cage-cultured weak-current-assisted reduction of liquid state dung and sewage electrodes of laying ducks
500L (pH8.9, the water content is 90 percent, and the Cu content is 8.8mg/L) of high-copper-content liquid dung discharged by a cage-rearing laying duck farm is input into a gentle slope sedimentation tank through a liquid dung collection pipeline, after natural sedimentation on a gentle slope, the solid content of the waste water at the upper end outlet of the gentle slope sedimentation tank is reduced to 4.1 percent, the solid content of the waste water is detected at the inlet end of a flocculation clarification tank after the waste water is continuously filtered by a filter screen and is reduced to 2.0 percent, and the Cu content is reduced to 6.9 mg/L. And (3) putting 500mg/L of polymeric ferric sulfate into the flocculation clarification tank through a flocculation reagent box, stirring at the rotating speed of 60r/min for 30min, and then shutting down the machine to flocculate and precipitate the wastewater. The turbidity of the flocculated wastewater is greatly reduced, the solid content of the wastewater detected at the outlet of the flocculation clarification tank is reduced to be below 0.01 percent, and the Cu content is reduced to 4.5 mg/L. Inputting the clarified waste liquid into a weak-current auxiliary iron electrode reduction pool, wherein the electrodes of the weak-current auxiliary iron electrode reduction pool are connected in a single-pole manner, 3 anodes are connected in parallel with the anode of a power supply, and 3 cathodes are connected in parallel with the cathode of the power supply. The electrified voltage is set to 35V, the current is controlled to be about 1A, and the electrification time is 0.5 h. And after the electrification is finished, emptying the waste liquid, and then turning off the power supply, and measuring that the content of Cu in the discharged waste liquid is reduced to 0.6mg/L, so that the discharge standard is met. In addition, the nitrogen removal rate of the waste liquid ammonia reaches 28 percent and the COD removal rate reaches 93 percent.
Example 4: method for removing heavy metals by cage-cultured weak-current-assisted reduction of liquid state dung and sewage electrodes of laying ducks
500L (pH9.3, water content 88 percent, Cd content 2.3mg/L, Hg content 1.6mg/L) of cadmium-and mercury-containing liquid manure discharged from a cage-rearing laying duck farm is input into a gentle slope sedimentation tank through a liquid manure collecting pipeline, after natural sedimentation through a gentle slope, the solid content of the waste water at the upper end of the gentle slope sedimentation tank is reduced to 3.5 percent, the solid content of the waste water detected at the inlet end of a flocculation clarification tank is reduced to 1.8 percent after the waste water is continuously filtered by a filter screen, the Cd content is reduced to 1.8mg/L, and the Hg + content is reduced to 1.2 mg/L. And (3) putting 500mg/L of polymeric ferric sulfate into the flocculation clarification tank through a flocculation reagent box, stirring at the rotating speed of 60r/min for 30min, and then shutting down the machine to flocculate and precipitate the wastewater. The turbidity of the flocculated wastewater is greatly reduced, the solid content of the wastewater detected at the outlet of the flocculation clarification tank is reduced to be below 0.1 percent, the Cd content is reduced to 1.1mg/L, and the Hg content is reduced to 0.6 mg/L. Inputting the clarified waste liquid into a weak-current auxiliary iron electrode reduction pool, wherein the electrodes of the weak-current auxiliary iron electrode reduction pool are connected in a single-pole manner, 3 anodes are connected in parallel with the anode of a power supply, and 3 cathodes are connected in parallel with the cathode of the power supply. The electrified voltage is set to 35V, the current is controlled to be about 1A, and the electrification time is 0.5 h. And after the electrification is finished, emptying the waste liquid, and then turning off the power supply, and measuring that the content of Cd in the discharged waste liquid is lower than 0.01mg/L and the content of Hg & lt + & gt is lower than 0.01mg/L, so that the discharge standard is met. In addition, the nitrogen removal rate of the waste liquid ammonia reaches 33 percent and the COD removal rate reaches 92 percent.
What is not described in this embodiment may be referred to in the relevant description of the rest of the application.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the present application or equivalent replacements of some technical features may still be made, which should all be covered by the scope of the technical solution claimed in the present application.
Claims (10)
1. The utility model provides a cage culture weak current auxiliary egg duck liquid state excrement iron scrap electrode reduction gets rid of heavy metal equipment which characterized in that includes:
the settling pond is configured to settle liquid dung of the cage-reared laying ducks to obtain low-solid-content wastewater and sludge;
the flocculation clarification tank is configured to flocculate and clarify the low-solid-content wastewater to obtain flocculation sediment and flocculated wastewater;
and the weak current auxiliary iron electrode reduction pool is configured to reduce the flocculated wastewater to remove heavy metals.
2. The device for removing heavy metals by reduction of the liquid state fecal iron of the egg-laying ducks which is supported by weak current in cage culture according to claim 1,
a first flow guide device is arranged between the sedimentation tank and the flocculation clarification tank, so that the low-solid-content wastewater in the sedimentation tank can be guided into the flocculation clarification tank; a second flow guide device is arranged between the flocculation settling tank and the weak current auxiliary iron electrode reduction tank, so that the wastewater after flocculation in the flocculation settling tank can be guided into the weak current auxiliary iron electrode reduction tank;
preferably, a height difference is arranged between the sedimentation tank and the flocculation clarification tank, so that the low-solid-content wastewater can enter the flocculation clarification tank from the sedimentation tank in an overflow mode; and a height difference is arranged between the flocculation clarification tank and the weak current auxiliary iron electrode reduction tank, so that the flocculated wastewater can enter the weak current auxiliary iron electrode reduction tank from the flocculation clarification tank in an overflow mode.
3. The apparatus for removing heavy metals by reduction of liquid state fecal sewage of cage-reared weak current assisted laying ducks by an iron electrode according to claim 2, wherein the sedimentation tank is further provided with a liquid state fecal sewage inlet for introducing the liquid state fecal sewage of the cage-reared laying ducks and a sludge outlet for discharging the sludge, and the sludge outlet is vertically lower than the first diversion device;
preferably, the sludge outlet is connected with a sludge recovery tank through a pipeline, so that the sludge in the sedimentation tank can be discharged into the sludge recovery tank;
more preferably, a mud pump is provided on the pipe.
4. The apparatus for removing heavy metals by reduction of liquid state iron excrement of laying ducks supplemented by weak electricity in cage culture according to claim 3, wherein a gentle slope is further arranged in the sedimentation tank, and the gentle slope inclines from the side of the excrement inlet to the side of the sludge outlet.
5. The device for removing heavy metals from the liquid state excrement and sewage of the cage-cultured weak-current-assisted laying ducks by electrode reduction according to claim 1, wherein a flocculation reagent box is arranged on one side of the flocculation settling tank and used for adding a flocculating agent into the flocculation settling tank, a three-layer rotating blade stirrer is arranged in the flocculation settling tank, the flocculation settling tank is provided with a conical bottom, and a flocculation precipitation outlet used for discharging the flocculation precipitation is arranged at the lowest part of the conical bottom;
preferably, a first splash guard is arranged in the flocculation clarification tank, and the first splash guard is arranged between the three-layer rotating blade stirrer and the first flow guide device and used for blocking the sludge in the flocculation clarification tank from flowing to the second flow guide device.
6. The apparatus for removing heavy metals by reduction of liquid state fecal sewage of egg-laying ducks which are bred in cage and assisted by weak current according to claim 1, wherein an electrode assembly is arranged inside the weak current assisted iron reduction tank, the weak current assisted iron reduction tank is provided with a conical bottom, the lowest part of the conical bottom is provided with a reduced precipitate outlet, and the side wall of the weak current assisted iron reduction tank, which is far away from the second diversion device, is provided with a purified water outlet;
preferably, a second baffle is arranged in the weak-current auxiliary iron electrode reduction tank, and the second baffle is arranged between the electrode assembly and the purified water outlet and is used for blocking the sludge in the weak-current auxiliary iron electrode reduction tank from flowing to the purified water outlet.
7. A weak current assisted method for removing heavy metals by reduction of liquid state fecal sewage iron electrodes of cage-cultured laying ducks is characterized by comprising the following steps:
1) primary precipitation: naturally settling the collected liquid dung of the cage-rearing laying ducks to obtain low-solid-content wastewater and sludge;
2) flocculation clarification: filtering the low-solid-content wastewater by a filter screen, and adding a flocculating agent for flocculation treatment to obtain flocculation precipitation and flocculated wastewater;
3) and (3) carrying out reduction by using a weak current auxiliary iron electrode to remove heavy metals: and reducing the flocculated wastewater by adopting a weak current auxiliary iron electrode, so that heavy metal ions in the flocculated wastewater are reduced on a polar plate under the assistance of weak current, and thus removing the high-content heavy metal in the wastewater.
8. The method for removing heavy metals by the reduction of the liquid state fecal iron of the cage-rearing laying ducks by weak current assistance according to claim 7, wherein the method adopts equipment as described in any one of claims 1 to 6.
9. The weak current assisted method for removing heavy metals from liquid state fecal iron of cage-reared laying ducks by electrode reduction according to claim 7, wherein the flocculant comprises at least one of ferrous sulfate, polymeric ferric sulfate and polymeric ferric aluminum sulfate.
10. The method for removing heavy metals by reduction of the liquid state fecal iron electrode of the cage-reared laying ducks assisted by weak current according to claim 7, wherein the specific conditions of the weak current assistance are that the electrifying voltage is controlled to be 25-30V, the current is controlled to be 0.5-2.5A, and the electrifying time is controlled to be 0.5-1 h.
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