Electrochemical device for sludge

Abstract

The utility model discloses an electrochemical device for sludge, which is characterized in that an anode flange is connected with an anode current collector through an anode fixing stud, the anode current collector is fixedly connected with an anode column, and the anode column is inserted into a gas collecting hood; a cathode column is arranged in the anode column, and the cathode column is fixedly connected with the cathode current collector; and the cathode current collector is connected with the cathode flange through a cathode fixing stud. According to the device provided by the utility model, the plurality of cathode columns and anode columns are connected in parallel, so that the multi-point electrolysis can be realized, the sludge treatment efficiency is improved, and meanwhile, the sludge dehydration is realized through the mechanical pressure provided by the electrolytic and gradually tightened cylindrical anode columns and the net-shaped permeable cathode columns.

Description

Technical Field

[0001] This utility model belongs to the field of sludge harmless treatment technology, specifically relating to an electrochemical device for sludge. Background Technology

[0002] With the acceleration of urbanization, the discharge of domestic and industrial wastewater is increasing daily, leading to a corresponding increase in sludge production as a byproduct of wastewater treatment. Sludge has a complex composition, extremely high water content, and is difficult to dehydrate, containing a significant amount of recalcitrant organic pollutants, harmful heavy metals, and pathogenic microorganisms. Practice has proven that sludge resource utilization is the inevitable solution for sludge treatment; however, more than half of the heavy metals produced during wastewater treatment are transferred to sludge, severely hindering its resource utilization. When sludge containing high levels of heavy metals is used in agriculture, it not only increases the heavy metal content in crops but also causes soil heavy metal pollution. During rainfall, some heavy metals from the sludge and soil enter surface runoff and groundwater infiltration, migrating with the water flow and causing secondary pollution of groundwater. Therefore, how to effectively treat heavy metals has become a crucial issue that must be addressed in sludge treatment and disposal.

[0003] Currently, heavy metal removal technologies are mainly divided into three categories: chemical methods, adsorption methods, and leaching methods. Chemical methods are effective in treating electroplating wastewater, but they can lead to the loss of nutrients in the sludge. Adsorption methods are efficient, convenient, and economical, but they have some issues with heat resistance, stability, and selectivity. Furthermore, industrial wastewater may contain complex organic pollutants, which can interfere with the adsorbent's absorption of metal ions. Leaching technology effectively removes heavy metals from sludge and is also effective in eliminating pathogens and controlling sludge odor. In addition, leaching has a positive effect on sludge dewatering and has broad application prospects; however, this method has a long retention time and easily produces large amounts of high-concentration heavy metal leachate. Electrochemical methods, a subcategory of chemical methods, are a relatively mature cleaning technology. They offer high selectivity for heavy metal ions, good treatment effects, no secondary pollution, recyclable heavy metal precipitates, mature processes, simple equipment, ease of operation, small footprint, and fast processing speed, making them increasingly popular.

[0004] Chinese patent CN206705927U discloses an electrochemical device for sludge treatment, comprising a device body, a feeding funnel at the top of the device body embedded therein, a connector at the bottom of the feeding funnel tightly welded to the device body, and an electric heating device on one side of the connector. This electrochemical device for sludge treatment includes a perchloric acid solution bottle, commonly known as aqua regia, which can digest dried sludge. The purpose of the digestion is to break down organic matter, dissolve suspended solids, and oxidize various valence states of the target element into a single high valence state or transform it into easily separable inorganic compounds. The digested sludge will then enter an electrolytic cell for electrolysis. After electrolysis, heavy metals in the sludge will gradually disappear, enabling rapid sludge purification and improving treatment efficiency.

[0005] Chinese patent CN207877541U discloses an electrochemical device for sludge treatment, including an electrochemical tank. An inlet is located on one side of the top of the electrochemical tank, and a stirring chamber is located below the inlet. A rotating roller is installed inside the stirring chamber, and a stirring column is fixedly connected to the outer surface of the rotating roller. An outlet is located at the bottom of the stirring chamber. The electrochemical tank is filled with perchloric acid solution. A cathode wire is fixedly connected to one side of the inside of the electrochemical tank, and an anode wire is fixedly connected above the cathode wire. This electrochemical device for sludge treatment, by incorporating a hydrochloric acid tank and a water pump, can effectively dissolve large particles and heavy metals contained in the sludge. The presence of cathode and anode wires enables effective electrolytic treatment of the dissolved sludge.

[0006] Existing electrolysis devices for sludge treatment are structurally complex, can only perform the electrolysis process, and have only one space where electrolysis occurs, resulting in low efficiency. Therefore, it is necessary to provide a device that can simultaneously perform multi-point electrolysis and simultaneously achieve electrolysis and dewatering to improve sludge treatment efficiency. Summary of the Invention

[0007] To address the aforementioned technical problems, this utility model provides an electrochemical device for sludge. By using multiple devices with parallel cathode and anode columns, multi-point electrolysis can be achieved, improving the sludge treatment efficiency. Simultaneously, through electrolysis, the mechanical pressure provided by the gradually tightening cylindrical anode column, and the water-permeable mesh cathode column, sludge dewatering is achieved.

[0008] To achieve the above objectives, this utility model provides an electrochemical device for sludge, wherein the anode flange and the anode current collector are connected by an anode fixing stud, the anode current collector is fixedly connected to the anode column, and the anode column is inserted into the gas collection hood; a cathode column is provided inside the anode column, and the cathode column is fixedly connected to the cathode current collector; the cathode current collector and the cathode flange are connected by a cathode fixing stud.

[0009] Preferably, the anode flange is provided with a sludge inlet; the anode current collector is provided with an anode sludge inlet.

[0010] More preferably, the sludge inlet has the same diameter as the anode sludge inlet.

[0011] Preferably, the anode column is a hollow structure that is wide at one end and narrow at the other, with the wide end fixedly connected to the anode current collector.

[0012] Preferably, the cathode column has a cathode column top at one end and a cathode column outlet at the other end.

[0013] Preferably, the cathode current collector is provided with a cathode fixing stud, a cathode column bottom air inlet, a cathode column bottom fixing tube, and a cathode sludge outlet; the cathode column bottom fixing tube is provided with a cathode column inter-column gas channel.

[0014] More preferably, the cathode column bottom fixing tube is fixedly connected to the cathode column.

[0015] Preferably, the cathode flange is provided with a sludge outlet, a cathode flange air supply channel in the middle, and a cathode flange air inlet channel on the side.

[0016] Preferably, the gas collecting hood is provided with a gas outlet for the gas collecting chamber.

[0017] Preferably, the anode current collector is provided with an anode sealing gasket, and the cathode current collector is provided with a cathode sealing gasket.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. The anode current collector and cathode current collector are equipped with a matching number of anode columns and cathode columns, and the anode columns are cylindrical so that the cathode columns can be inserted into them, forming an independent electrolysis device. This realizes multi-point electrolysis of sludge and significantly improves the electrolysis treatment speed of sludge.

[0020] 2. The anode column is a cylindrical shape with a gradually narrowing inner diameter, and the cathode column is a mesh electrode. The aperture allows gas and water molecules to enter and exit, but blocks sludge molecules from exiting. Therefore, it simultaneously applies an electric field and mechanical pressure to the sludge, achieving sludge dewatering while electrolyzing and separating heavy metals, thus reducing the difficulty of subsequent sludge treatment. At the same time, heavy metals and water are discharged together, facilitating the collection of heavy metals and subsequent treatment.

[0021] 3. This utility model has a simple structure and can complete the electrolysis and dewatering of sludge in one step, simultaneously achieving the separation and dewatering of heavy metals in the sludge. It is easy to operate, environmentally friendly, and has broad application prospects. Attached Figure Description

[0022] Figure 1 This is an exploded view of the overall structure of this utility model.

[0023] Figure 2 This is a front view of the assembled version of this utility model.

[0024] Figure 3 This is an assembly cross-sectional view of the present invention.

[0025] Figure 4 This is a structural diagram of the cathode flange.

[0026] Figure 5 This is a schematic diagram of the overall structure of the cathode current collector.

[0027] Figure 6 This is a bottom view of the cathode current collector.

[0028] Figure 7 This is a schematic diagram of the overall structure of the anode flange.

[0029] Figure 8 This is a schematic diagram of the overall structure of the anode current collector.

[0030] In the diagram, 1 is the cathode flange, 2 is the sludge outlet, 3 is the cathode current collector, 4 is the cathode column, 5 is the gas collection hood, 6 is the anode column, 7 is the anode current collector, 8 is the anode flange, 9 is the sludge inlet, 10 is the anode sludge inlet, 11 is the gas outlet of the gas collection chamber, 12 is the top of the cathode column, 13 is the gas channel between cathode columns, 14 is the cathode sludge outlet, 15 is the anode fixing stud, 16 is the cathode column bottom fixing pipe, 17 is the cathode column water outlet, 18 is the cathode column bottom air inlet, 19 is the cathode flange air inlet channel, 20 is the cathode flange air distribution channel, 21 is the cathode fixing stud, 22 is the anode sealing gasket, and 23 is the cathode sealing gasket. Detailed Implementation

[0031] The technical solution of this utility model will be further explained below with reference to the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of this utility model and should not be construed as limiting this utility model. The protection scope of this utility model should be determined by the content of the claims. Modifications or substitutions made by those skilled in the art to the technical solution of this utility model without creative effort all fall within the protection scope of this utility model.

[0032] Example 1

[0033] like Figure 1-8 As shown, an electrochemical device for sludge includes an anode flange 8 and an anode current collector 7 connected by an anode fixing stud 15. Sludge is fed into the anode current collector 7 for treatment. The anode current collector 7 is fixedly connected to an anode column 6, which is inserted into a gas collection hood 5. A cathode column 4 is provided inside the anode column 6 and is fixedly connected to a cathode current collector 3. The cathode current collector 3 is connected to a cathode flange 1 by a cathode fixing stud 21. Multiple electrolysis devices are formed in one electrochemical device, which can simultaneously realize multiple electrolysis of sludge.

[0034] Preferably, the anode flange 8 and the cathode flange 1 are made of insulating material, the anode current collector 7 is connected to the positive terminal of the power supply, and the cathode current collector 3 is connected to the negative terminal of the power supply to provide power to the electrochemical device and realize synchronous electrolysis.

[0035] Preferably, the anode flange 8 is provided with a sludge inlet 9, which can be directly connected to the end of the sludge conveying pipeline, so that sludge with high water content can be directly conveyed through the channel to the electrochemical device; the anode current collector is provided with an anode sludge inlet 10, which conveys the sludge to the anode column 6.

[0036] More preferably, the sludge inlet 9 has the same diameter as the anode sludge inlet 10.

[0037] Preferably, the anode column 6 is a hollow structure with one end wide and the other end narrow, and the inner diameter gradually narrows. The wide end is fixedly connected to the anode current collector 7. When the sludge passes through the anode column 6, in addition to dewatering under the action of electric field force, it will also be squeezed and dewatered due to the increase of mechanical pressure, further reducing the moisture content of the treated sludge.

[0038] More preferably, the electrolysis part of the anode column 6 is made into a cylindrical electrode by attaching a ruthenium-iridium coating to the surface of a mesh titanium-based electrode, and the outer surface is attached with a thin film made of polytetrafluoroethylene (PTFE), which allows gas to enter and exit freely, while preventing liquid from passing through the anode into the gas collection chamber 5.

[0039] Preferably, one end of the cathode column 4 is provided with a cathode column top 12, which facilitates the insertion of the cathode column 4 into the anode column 6; the other end is provided with a cathode column outlet 17, which discharges water from the sludge into the sludge system, thereby achieving sludge dewatering.

[0040] In a further preferred embodiment, the cathode column 4, which participates in the electrolysis, uses a mesh titanium electrode as the base material, with a mixture of conductive carbon powder and polytetrafluoroethylene evenly adhered on both sides. At the same time, it is uniformly provided with small pores to facilitate the passage of water in the sludge and to block sludge particles. Finally, the water that enters the cathode column 4 is discharged through the cathode column outlet 17 at the bottom, thus completing the dehydration.

[0041] More preferably, the cathode column outlet 17 is connected to an external drainage pipe to discharge the sludge dewatering device, thereby separating the sludge from the water and reducing the sludge moisture content.

[0042] Preferably, the cathode current collector 3 is equipped with a cathode fixing stud 21, a cathode column bottom air inlet 18, a cathode column bottom fixing pipe 16, and a cathode sludge outlet 14; the cathode column bottom fixing pipe 16 is provided with a cathode column inter-column gas channel 13. The cathode fixing stud 21 presses and fixes the three cathode flanges 1 of the cathode current collector to prevent leakage; the cathode column bottom air inlet 18 continuously supplies gas to the cathode columns 6 to ensure the smooth progress of the electrolysis reaction; the cathode column inter-column gas channel 13 ensures that the gas flows through each cathode column 4 in the device, avoids blockage, and ensures the normal progress of electrolysis.

[0043] More preferably, the cathode column bottom fixing tube 16 is fixedly connected to the cathode column 4. The cathode column bottom fixing tube 16 helps to fix the cathode column 4, preventing the cathode column 4 from shifting when it is inserted into the anode column 6, so that the cathode column 4 and the anode column 6 keep their axes aligned.

[0044] Preferably, the cathode flange 1 is provided with a sludge outlet 2 to discharge the sludge after electrolysis and dewatering; a cathode flange gas replenishment channel 20 is provided in the middle and a cathode flange gas inlet channel 19 is provided on the side to continuously replenish gas into the cathode.

[0045] Preferably, the gas collecting hood 5 is provided with a gas outlet 11 for the gas collecting chamber, which can be connected to the air inlet of an external air compressor. The air compressor can be connected to external air or an oxygen cylinder to replenish the gas in the device in time when the gas production of the anode is insufficient or the gas consumption of the cathode increases, so as to ensure that the gas pressure inside the cathode column 4 remains relatively stable and to ensure that the electrolysis reaction proceeds normally and stably.

[0046] Preferably, the anode current collector 7 is provided with an anode sealing gasket 22 to enhance the sealing performance and prevent sludge leakage and the entry of external impurities; the cathode current collector 3 is provided with a cathode sealing gasket 23 to enhance the sealing performance and prevent sludge leakage and the entry of external impurities.

Claims

1. An electrochemical device for sludge, characterized by: The anode flange (8) is connected with the anode current collector (7) through an anode fixing stud (15), the anode current collector (7) is fixedly connected with the anode column (6), the anode column (6) is inserted into the gas collecting cover (5); the anode column (6) is internally provided with the cathode column (4), the cathode column (4) is fixedly connected with the cathode current collector (3); the cathode current collector (3) is connected with the cathode flange (1) through a cathode fixing stud (21); The anode flange (8) is provided with a sludge inlet (9); the anode current collector is provided with an anode sludge inlet (10); The anode column (6) is a hollow structure with one end wide and the other end narrow, the wide end is fixedly connected with the anode current collector (7).

2. An electrochemical device for sludge according to claim 1, characterized in that: The sludge inlet (9) and the anode sludge inlet (10) have the same caliber.

3. An electrochemical device for sludge according to claim 1, characterized in that: The cathode column (4) is provided with a cathode column top (12) at one end and a cathode column water outlet (17) at the other end.

4. An electrochemical device for sludge according to claim 1, characterized in that: The cathode current collector (3) is provided with a cathode fixing stud (21), a cathode column bottom gas inlet (18), a cathode column bottom fixing pipe (16) and a cathode sludge outlet (14); the cathode column bottom fixing pipe (16) is internally provided with a cathode column interstitial gas passage (13).

5. An electrochemical device for sludge according to claim 4, characterized in that: The cathode column bottom fixing pipe (16) is fixedly connected with the cathode column (4).

6. An electrochemical device for sludge according to claim 1, characterized in that: The cathode flange (1) is provided with a sludge outlet (2) at the middle part, a cathode flange air supplement passage (20) at the side part and a cathode flange gas inlet passage (19).

7. An electrochemical device for sludge according to claim 1, characterized in that: The gas collecting cover (5) is provided with a gas collecting chamber gas outlet (11).

8. An electrochemical device for sludge according to claim 1, characterized in that: The anode current collector (7) is provided with an anode sealing gasket (22), and the cathode current collector (3) is provided with a cathode sealing gasket (23).

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