Electrochemical pretreatment device for livestock and poultry wastewater

Abstract

The utility model provides an electrochemical pretreatment device for livestock and poultry wastewater, which comprises a sewage treatment tank and a direct-current power supply workbench connected with a cathode and an anode arranged in the sewage treatment tank, and a stirring structure, a sludge precipitation inclined plate, a sludge outlet pipeline and a water outlet structure are arranged in the sewage treatment tank. The water outlet structure comprises a suspension pad arranged on the liquid level in the sewage treatment tank and a water outlet pipeline arranged on the suspension pad, the upper end of the water outlet pipeline is connected with a telescopic hose, the tail end of the telescopic hose is connected with a drainage pipeline, and a drainage valve is arranged on the drainage pipeline; iron and magnesium materials are used as anodes of electrochemical reaction, so that the pollutant removal effect is achieved, and suspended matters are settled under the electric flocculation effect; a magnesium material is used as an anode and can react with nitrogen and phosphorus elements in the wastewater to generate struvite, so that the effect of recycling nitrogen and phosphorus is achieved; calcium oxide or air flotation can further accelerate sedimentation of SS, the content of suspended solids in wastewater is reduced to 500 or below, convenience and effectiveness are achieved, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the technical field of livestock wastewater treatment, and in particular to an electrochemical pretreatment device for livestock and poultry wastewater. Background Technology

[0002] Livestock wastewater is the primary source of pollution from livestock farms to the surrounding environment.

[0003] Livestock wastewater mainly includes livestock excrement, wastewater from pen flushing, wastewater from pipe flushing, and waste drinking water. Livestock wastewater often has a high suspended solids (SS) content (up to 10,000 in pig farm wastewater and tens of thousands in cattle farm wastewater), with nitrogen levels between 1000 and 2000 mg / L and phosphorus levels between 500 and 600 mg / L. Suspended solids need to be removed during wastewater pretreatment. Current methods for removing suspended solids include filtration and adding large amounts of flocculants for sedimentation.

[0004] Adding flocculants for sedimentation requires a large amount of flocculant, resulting in high costs and poor removal efficiency. Utility Model Content

[0005] This invention aims to provide an electrochemical pretreatment device for livestock and poultry wastewater. It uses electrochemical reactions combined with calcium oxide and / or air flotation to precipitate and reduce the content of suspended solids in wastewater. At the same time, it can also realize the resource recovery of some nitrogen and phosphorus in the form of struvite precipitation. It has a good SS removal effect. This invention is mainly used for the treatment of wastewater from pig or cattle farms with high SS content.

[0006] Therefore, the technical solution adopted by this utility model is as follows: an electrochemical pretreatment device for livestock and poultry wastewater, including a wastewater treatment tank, a DC power supply workbench on the wastewater treatment tank, the DC power supply workbench being connected to a cathode and an anode disposed in the wastewater treatment tank via wires, a stirring structure disposed in the wastewater treatment tank, a sludge settling inclined plate disposed at the bottom of the wastewater treatment tank, the cathode and anode being located above the sludge settling inclined plate, an outlet pipe being connected to the bottom of the sludge settling inclined plate, and an outlet structure for discharging supernatant disposed on the side wall of the wastewater treatment tank; a calcium oxide addition device disposed above the wastewater treatment tank and / or an air flotation device disposed at the bottom of the wastewater treatment tank, the air flotation device being located above the sludge settling inclined plate.

[0007] As a preferred embodiment of the above scheme, the anode is made of iron and / or magnesium, and the cathode is made of stainless steel.

[0008] More preferably, there are two or more sets of cathodes and anodes, with the cathodes and anodes arranged alternately, and the anodes are made of iron and magnesium or other active metal materials, with the anodes made of magnesium, iron or other active metal materials arranged alternately.

[0009] More preferably, the water outlet structure includes a suspension pad disposed on the liquid surface in the sewage treatment tank and a water outlet pipe disposed below the suspension pad. The lower end of the water outlet pipe is connected to a telescopic hose, and the lower end of the telescopic hose is connected to a drain pipe. The drain pipe is located at the lower part of the side wall of the sewage treatment tank, and a drain valve is provided on the drain pipe.

[0010] More preferably, a fixing ring is rotatably connected to the upper end of the water outlet pipe, and the upper end of the fixing ring is connected to the suspension pad through a plurality of connecting columns arranged in a circumferential array, with the water inlet at the upper end of the water outlet pipe below the liquid surface.

[0011] More preferably, the wastewater treatment tank is provided with a placement rack for placing the cathode and anode, and the anode and cathode are placed in the wastewater treatment tank through the placement rack.

[0012] More preferably, the stirring structure includes a rotating rod and stirring blades arranged at the bottom of the rotating rod, a drive motor connected to the rotating rod is provided above the sewage treatment tank, and the stirring blades are arranged below the cathode and anode.

[0013] More preferably, the number of sludge settling inclined plates is four, which can be assembled into a funnel-shaped structure that gradually slopes downward from the periphery to the center. The upper end of the sludge settling inclined plate is set on the side wall of the sewage treatment tank, and the lower end is closely attached to the top of the outlet pipe.

[0014] A further preferred embodiment is that a mud discharge valve is provided on the outlet pipe.

[0015] More preferably, the wastewater treatment tank is provided with a grid to limit the descent position of the suspended pad.

[0016] The beneficial effects of this invention are as follows: By setting up an electrochemical DC power supply workbench inside the wastewater treatment tank and an outlet structure above the tank, and using iron and magnesium materials as the anode for the electrochemical reaction, not only can pollutants be removed through electrochemical oxidation-reduction reactions, but suspended solids can also be settled through electrocoagulation. Furthermore, if magnesium is used as the anode, it can react with nitrogen and phosphorus in the wastewater to form struvite, achieving resource recovery of nitrogen and phosphorus. Adding calcium oxide or air flotation can further accelerate the sedimentation of suspended solids (SS). The supernatant is discharged through an outlet pipe set on a suspension pad, and suspended solids are discharged through an outlet pipe below after settling on a sludge settling inclined plate. After electrochemical treatment, the suspended solids content in the wastewater is reduced to below 500 mg / L. This reduces nitrogen and phosphorus content while simultaneously lowering the suspended solids content, improving wastewater treatment efficiency, and making the treatment of livestock wastewater more convenient, effective, and cost-efficient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, an electrochemical pretreatment device for livestock and poultry wastewater includes a wastewater treatment tank 1. A DC power supply workbench (not shown) is installed on the wastewater treatment tank 1. The DC power supply workbench is connected to a cathode and anode installed in the wastewater treatment tank 1 via wires. A stirring structure is installed inside the wastewater treatment tank 1. A sludge settling inclined plate 2 is installed at the bottom of the wastewater treatment tank 1. The cathode and anode are located above the sludge settling inclined plate 2. An outlet pipe 3 is connected to the bottom of the sludge settling inclined plate 2. An outlet structure for discharging supernatant is installed on the side wall of the wastewater treatment tank 1. A calcium oxide addition device (not shown in the figure) is installed above the wastewater treatment tank 1. The calcium oxide addition device can be conveyed by a metering conveyor belt, such as including a storage hopper, with a belt conveyor mechanism at the bottom of the storage hopper and a metering valve at the outlet of the storage hopper. Calcium oxide can also be added manually. A flotation device 11 is installed at the bottom of the wastewater treatment tank 1. The flotation device 11 is an existing structure and is located above the sludge settling inclined plate 2.

[0020] The anode is made of iron and magnesium or other reactive metals; here, we use iron and / or magnesium for the anode. The cathode is made of stainless steel. There are two or more sets of both the anode and cathode, with alternating anode and cathode plates. Alternatively, if the anode is made of magnesium and iron, the magnesium and iron plates can also be alternated. This facilitates the electrochemical reaction and accelerates the sedimentation of suspended solids (SS). Any reactive metal can be used as the anode; using magnesium as the anode can generate struvite during the reaction. In actual treatment, different metal materials can be introduced as the anode depending on the effluent treatment method or intended use.

[0021] The effluent structure includes a suspended pad 4 positioned on the liquid surface within the wastewater treatment tank 1 and an effluent pipe 5 positioned below the suspended pad 4. A flexible hose 6 is connected to the lower end of the effluent pipe 5, and a drain pipe 7 is connected to the lower end of the flexible hose 6. The drain pipe is located on the lower part of the side wall of the wastewater treatment tank 1, above the sludge settling inclined plate 2. A drain valve (not shown in the figure) is installed on the drain pipe 7. By positioning the effluent pipe 5 below the suspended pad 4, the suspended pad 4 remains suspended on the water surface, ensuring that the effluent begins from the supernatant above.

[0022] A fixing ring is rotatably connected to the upper end of the water outlet pipe 5. The upper end of the fixing ring is connected to the suspension pad 4 through multiple connecting posts arranged in a circumferential array. The water inlet at the upper end of the water outlet pipe 5 is below the liquid surface. The water outlet pipe 5 is positioned below the suspension pad 4 via the fixing ring, with a gap between the fixing ring and the suspension pad 4 to facilitate water intake.

[0023] The wastewater treatment tank 1 is equipped with a placement rack 12 for placing the cathode and anode. The anode and cathode are placed in the wastewater treatment tank 1 through the placement rack 12.

[0024] The stirring structure includes a rotating rod 8 and stirring blades 9 arranged at the bottom of the rotating rod 8. A drive motor (not shown in the figure) connected to the rotating rod 8 is installed above the sewage treatment tank 1. The stirring blades 9 are positioned below the cathode and anode. Stirring is performed in the initial stage of the electrochemical reaction to accelerate it. The stirring blades 9 are positioned below the cathode and anode to prevent damage to the cathode and anode during rotation and to avoid the wires from falling off.

[0025] Four sludge settling inclined plates 2 are provided, which can be assembled into a funnel-shaped structure that gradually slopes downwards from the periphery to the center. The upper end of the sludge settling inclined plates 2 is set on the side wall of the sewage treatment tank 1, and the lower end is attached to the top of the outlet pipe 3. The sludge in the sewage treatment tank 1 is guided and settled at the bottom of the sludge settling inclined plates 2 through the sludge settling inclined plates 2, and then enters the outlet pipe 3, which facilitates the settling and discharge of suspended solids.

[0026] A sludge discharge valve is installed on pipe 3. The treated sludge contains struvite and has high nitrogen and phosphorus content, making it suitable for processing into organic fertilizer.

[0027] The wastewater treatment tank 1 is equipped with a grid 10 to limit the descent position of the suspended pad 4. By installing the grid 10 inside the wastewater treatment tank 1, the suspended pad 4 is prevented from contacting the sludge downwards when the water level in the wastewater treatment tank 1 is too low. This prevents the sludge from entering the effluent pipe 5, blocking the effluent pipe 5, or adhering to the suspended pad 4, making it difficult to clean.

[0028] By installing an electrochemical DC power supply workbench inside the wastewater treatment tank 1 and setting an effluent structure above the tank, using iron and magnesium materials as the anode for the electrochemical reaction, pollutant removal can be achieved not only through electrochemical oxidation-reduction reactions but also through electrocoagulation to settle suspended solids. Furthermore, using magnesium as the anode allows for the reaction with nitrogen and phosphorus in the wastewater to form struvite, achieving resource recovery of nitrogen and phosphorus. Adding calcium oxide or air flotation further accelerates the settling of suspended solids (SS). The supernatant is discharged through the effluent pipe 5 located on the suspension pad 4, while suspended solids are discharged through the effluent pipe 3 below after settling on the sludge sedimentation inclined plate 2. After electrochemical treatment, the suspended solids content in the wastewater is reduced to below 500 mg / L. This reduces both suspended solids and nitrogen and phosphorus content, improving wastewater treatment efficiency and making livestock wastewater treatment more convenient, effective, and cost-efficient.

[0029] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrochemical pretreatment device for livestock and poultry wastewater, characterized in that: The system includes a wastewater treatment tank (1), on which a DC power supply workbench is provided. The DC power supply workbench is connected to a cathode and an anode located in the wastewater treatment tank (1) via wires. A stirring structure is provided in the wastewater treatment tank (1). A sludge settling inclined plate (2) is provided at the bottom of the wastewater treatment tank (1). The cathode and anode are located above the sludge settling inclined plate (2). An outlet pipe (3) is connected to the bottom of the sludge settling inclined plate (2). An outlet structure for discharging supernatant is provided on the side wall of the wastewater treatment tank (1). A calcium oxide addition device is provided above the wastewater treatment tank (1) or / and an air flotation device (11) is provided at the bottom of the wastewater treatment tank (1). The air flotation device (11) is located above the sludge settling inclined plate (2).

2. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 1, characterized in that: The anode is made of iron and / or magnesium, and the cathode is made of stainless steel.

3. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 2, characterized in that: The cathode and anode are in two or more sets, with the cathode and anode electrodes arranged alternately. The anode is made of iron and magnesium or other active metal materials, and the anodes made of magnesium, iron or other active metal materials are arranged alternately.

4. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 1, characterized in that: The effluent structure includes a suspension pad (4) set on the liquid surface in the sewage treatment tank (1) and an effluent pipe (5) set below the suspension pad (4). The lower end of the effluent pipe (5) is connected to a telescopic hose (6), and the lower end of the telescopic hose (6) is connected to a drain pipe (7). The drain pipe (7) is located on the lower part of the side wall of the sewage treatment tank (1) and above the sludge sedimentation inclined plate (2). A drain valve is provided on the drain pipe (7).

5. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 4, characterized in that: The upper end of the water outlet pipe (5) is rotatably connected to a fixed ring. The upper end of the fixed ring is connected to the suspension pad (4) through multiple connecting columns arranged in a circular array. The water inlet at the upper end of the water outlet pipe (5) is below the liquid surface.

6. The electrochemical pretreatment device for livestock and poultry wastewater according to any one of claims 1-5, characterized in that: The wastewater treatment tank (1) is provided with a placement rack (12) for placing the cathode and anode, and the anode and cathode are placed in the wastewater treatment tank (1) through the placement rack (12).

7. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 6, characterized in that: The stirring structure includes a rotating rod (8) and stirring blades (9) arranged at the bottom of the rotating rod (8). A drive motor connected to the rotating rod (8) is provided above the sewage treatment tank (1), and the stirring blades (9) are arranged below the cathode and anode.

8. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 7, characterized in that: The number of sludge settling inclined plates (2) is four, which can be assembled into a funnel-shaped structure that gradually slopes downward from the periphery to the center. The upper end of the sludge settling inclined plate (2) is set on the side wall of the sewage treatment tank (1), and the lower end is attached to the top of the outlet pipe (3).

9. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 8, characterized in that: A mud discharge valve is installed on the outlet pipe (3).

10. The electrochemical pretreatment device for livestock and poultry wastewater according to claim 9, characterized in that: The wastewater treatment tank (1) is equipped with a grid (10) to limit the descent position of the suspended pad (4).

Images