Online electrolysis pressure filtration type sludge reduction device

Abstract

The utility model discloses an online electrolysis pressure filtration type sludge reduction device, which relates to the technical field of environmental protection water treatment industry, and comprises a direct current power supply, two pressing plates, a partition plate, an electrode plate and a diaphragm, and an insulating plate, an electrode plate, a gasket, a water permeable plate, a diaphragm and a material frame are sequentially arranged on the inner sides of the two pressing plates; two water permeable plates, two diaphragms and a material frame are arranged between the two electrode plates to form an electrolysis unit; the material frame is arranged in the middle of the electrolysis unit, a diaphragm, a permeable plate and an electrode plate are arranged on the two sides of the material frame respectively, an electrochemical method is combined with a physical mode, firstly, strong oxidizing substances generated by electrolysis are used for inactivating thalli and breaking cell walls, meanwhile, in an electrolysis pressure filtration cavity, the release of cell sap is enhanced through pressurization, and then anaerobic treatment is conducted, so that the cell sap is formed. Organic substances are further digested, so that the absolute amount of the sludge is reduced, and the water content of the factory sludge can be reduced to 60% or below.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection water treatment industry, and particularly relates to an on-line electrolytic pressure filtration type sludge reduction device. Background Technique

[0002] A large amount of excess activated sludge is generated in urban sewage treatment plants. It is a complex solid waste composed of organic matter fragments, bacteria, inorganic particles, colloids, etc. It has a high water content, a high organic matter content, and a large volume. It is difficult to treat and has a high cost, accounting for nearly half of the operating costs of urban sewage treatment plants. Sludge reduction and resource utilization are important goals for all sewage treatment plants.

[0003] One way of sludge reduction is to break the cell wall and release the cell fluid. The existing technologies include: physical methods such as high-intensity ultrasonic waves and hydrodynamic cavitation; chemical methods based on the Fenton method; and biochemical methods such as CN116477820A (an anaerobic device for biochemical excess sludge reduction and its application).

[0004] Generally, the sludge separated by pressure filtration has a water content of 80-90%. After the above-mentioned existing methods and devices, the water content of the existing factory sludge can be reduced to about 65%, and it is difficult to achieve below 60%. To solve this technical problem, the utility model proposes an on-line electrolytic pressure filtration type sludge reduction device. Content of the Utility Model

[0005] The main purpose of the utility model is to provide an on-line electrolytic pressure filtration type sludge reduction device, which can effectively solve the problems mentioned in the background technique.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] An on-line electrolytic pressure filtration type sludge reduction device includes a DC power supply, a pressing plate, an insulating plate, an electrode plate, and a diaphragm. Inside the two pressing plates, an insulating plate, an electrode plate, a gasket, a water-permeable plate, a diaphragm, and a material frame are arranged in sequence. Between the two electrode plates, two water-permeable plates, two diaphragms, and a material frame are provided to form an electrolysis unit. The material frame is arranged in the middle of the electrolysis unit. On both sides of the material frame are a diaphragm, a water-permeable plate, and an electrode plate respectively. There are multiple groups of electrolysis units between the two pressing plates.

[0008] Preferably, the inside of the electrode plate is respectively provided with a cathode plate, an anode plate, and a bipolar plate. The anode plate is composed of a graphite plate or a DSA titanium anode plate. The material of the cathode plate is composed of titanium, nickel, aluminum, or stainless steel. The bipolar plate is a DSA titanium anode plate with a coating on one side, and the same-name pole distance is 10-50 mm.

[0009] Preferably, the diaphragm is a diaphragm filter cloth or a ceramic filter plate, and the diaphragm filter cloth is a polyester 103 filter cloth or a 240 filter cloth.

[0010] Preferably, the water-permeable plate is made of reinforced polypropylene or a graphite plate. A diversion hole is provided in the upper or middle part of the water-permeable plate and communicates with the liquid inlet. Circular cushion columns and connecting ribs are distributed in the middle part of the water-permeable plate. The circular cushion columns and the connecting ribs account for 30%-50% of the area of the water-permeable plate. The circular cushion columns can support the diaphragm to facilitate the flow of the filtrate of the diaphragm in the water-permeable plate, and the filtrate of the diaphragm finally discharges from the liquid outlet.

[0011] Preferably, when both the cathode plate and the anode plate are graphite plates, one side of the graphite plate is made into the shape of a water-permeable plate, so that the electrode plate and the water-permeable plate are integrated, thus saving the water-permeable plate and the material frame.

[0012] Preferably, the material of the material frame is plastic or rubber. The length and width dimensions of the outer shape of the material frame are the same as those of the water-permeable plate. A liquid inlet channel 1 and a liquid inlet channel 2 are provided in the upper part of the material frame.

[0013] Preferably, for the electrical connection mode of the electrode plates: in a device composed of several electrolysis units, one cathode plate and one anode plate are arranged at both ends. The positive and negative poles of the DC power supply are respectively connected to the conductive ears of the anode plate and the cathode plate at both ends, and the bipolar plate has no wire connection; in a device composed of several electrolysis units, the cathode plates and the anode plates are arranged alternately and connected in parallel. Conductive ears are provided outside each cathode plate and anode plate and are respectively connected in parallel to the positive and negative poles of the DC power supply.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In the utility model, after power is turned on, free radicals mainly composed of ·Cl will be generated first in the cavity formed between the anode plate and the cathode plate. The chemical activity is very strong and can quickly kill viruses and bacteria.

[0016] In the utility model, the subsequent hydrolysis of the chlorine free radicals forms effective chlorine mainly composed of HClO to oxidize and decompose the active groups of amino acids of microorganisms (viruses, bacteria, spores of single-celled algae, and multi-celled algae), which can cause chemical damage to proteins until the microorganisms die. At this time, the cell wall ruptures and a large amount of cell fluid flows out, and the water content of the mud solid phase decreases.

[0017] In the utility model, after anaerobic biochemical treatment, the residual organic matter is further decomposed, and the absolute amount of sludge decreases.

[0018] In the present utility model, it is possible to simultaneously reduce the pollutant indexes such as COD, suspended solids, total phosphorus, ammonia nitrogen, and chromaticity in the separated water, improve the further biodegradability, and the sludge cake has been disinfected and can be recycled after leaving the factory, such as being used as organic fertilizer and returning to the field. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the main body of an on-line electrolytic pressure filtration type sludge reduction device of the present utility model;

[0020] Figure 2 It is a schematic diagram of the water permeable plate component of an on-line electrolytic pressure filtration type sludge reduction device of the present utility model;

[0021] Figure 3 It is a schematic diagram of the material frame component of an on-line electrolytic pressure filtration type sludge reduction device of the present utility model;

[0022] Figure 4 It is a schematic diagram of the electrode plate component of an on-line electrolytic pressure filtration type sludge reduction device of the present utility model.

[0023] In the figure: 1. cathode plate; 2. water permeable plate; 21. diversion hole; 22. circular cushion column; 23. connecting rib; 24. liquid outlet; 3. material frame; 31. first liquid inlet channel; 32. second liquid inlet channel; 4. bipolar plate; 5. diaphragm; 6. gasket; 7. anode plate; 71. conductive ear; 8. insulating plate; 9. pressing plate; 10. liquid inlet. Detailed Embodiment

[0024] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] As Figures 1-4 shown, an on-line electrolytic pressure filtration type sludge reduction device, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, includes a DC power supply, a pressing plate 9, an insulating plate 8, electrode plates, a diaphragm 5. Inside the two pressing plates 9, an insulating plate 8, electrode plates, a gasket 6, a water permeable plate 2, a diaphragm 5, and a material frame 3 are arranged in sequence; inside the electrode plates, a cathode plate 1, an anode plate 7, and a bipolar plate 4 are respectively arranged. The anode plate 7 is composed of a graphite plate or a DSA titanium anode plate and has good reaction performance. The material of the cathode plate 1 is composed of titanium, nickel, aluminum, or stainless steel and has a relatively high service life. The bipolar plate 4 is a DSA titanium anode plate with a coating on one side, and the same-pole distance is 10 - 50 mm.

[0026] There are two water-permeable plates 2, two diaphragms 5 and a material frame 3 arranged between two electrode plates to form an electrolysis unit; the material of the water-permeable plate 2 is reinforced polypropylene or graphite plate. There are diversion holes 21 provided in the upper or middle part of the water-permeable plate 2, which communicate with the liquid inlet 10. Circular cushion columns 22 and connecting ribs 23 are distributed in the middle part of the water-permeable plate 2. The circular cushion columns 22 and the connecting ribs 23 account for 30%-50% of the area of the water-permeable plate 2. The circular cushion columns 22 can support the diaphragm 5 to facilitate the filtrate of the diaphragm 5 to flow in the water-permeable plate 2, and finally the filtrate of the diaphragm 5 is discharged from the liquid outlet 24.

[0027] When both the cathode plate 1 and the anode plate 7 are graphite plates, one side of the graphite plate is made into the shape of the water-permeable plate 2, so that the electrode plate and the water-permeable plate 2 are integrated, thus eliminating the water-permeable plate 2 and the material frame 3, which is beneficial to improving the stability during use.

[0028] The material frame 3 is arranged in the middle of the electrolysis unit. On both sides of the material frame 3 are the diaphragm 5, the water-permeable plate 2 and the electrode plate respectively. The material of the material frame 3 is plastic or rubber, which has good insulation performance. The length and width dimensions of the outer shape of the material frame 3 are the same as those of the water-permeable plate 2, which is convenient for installation and positioning. There are a liquid inlet channel 31 and a liquid inlet channel 32 provided in the upper part of the material frame 3.

[0029] The diaphragm 5 is a diaphragm filter cloth or a ceramic filter plate. The diaphragm filter cloth is a terylene 103 filter cloth or a 240 filter cloth. Using the terylene filter cloth has good water permeability and fiber strength, and a relatively high service life.

[0030] There are multiple groups of electrolysis units between two pressing plates 9. The electrical connection method of the electrode plates: in a device composed of several electrolysis units, one cathode plate 1 and one anode plate 7 are arranged at both ends, and the positive and negative poles of the DC power supply are respectively connected to the conductive ears 71 of the anode plate 7 and the cathode plate 1 at both ends, and the bipolar plate 4 has no wire connection.

[0031] In a device composed of several electrolysis units, the cathode plates 1 and the anode plates 7 are arranged alternately and connected in parallel. There are conductive ears 71 provided outside each cathode plate 1 and anode plate 7 and are respectively connected in parallel to the positive and negative poles of the DC power supply.

[0032] First, it is necessary to determine the amount of NaCl to be supplemented according to the chloride ion content in the sludge from the sedimentation tank. Generally, the chlorine content in the sewage of urban sewage treatment plants is 300-800 mg / l. When the sludge contains 1000 mg / l, during the electrolysis operation, the effective chlorine amount generated will be more than 10 mg / l, which is sufficient to kill viruses and bacteria. In addition, reducing COD and decomposing ammonia nitrogen will also consume the effective chlorine. Therefore, the appropriate value of the chlorine content in the sludge entering the on-line electrolytic pressure filtration type sludge reduction device is 2000-3000 mg / l. If the original biochemical effect is poor and the sludge quality is poor, the supplementary amount needs to be further increased, and the appropriate value is 5000-8000 mg / l.

[0033] During electrolysis, the current value needs to be adjusted according to the residual chlorine content in the anode-side effluent of the on-line electrolytic pressure filtration type sludge reduction device. The increase in current should be limited by the condition that the voltage does not exceed 4.5V (inter-electrode voltage). The residual chlorine value generally remains at 5-10mg / l. To ensure the electrolysis effect, electrolysis should continue for a period of time after the slurry pump stops. It is advisable to electrolyze for 10 minutes and then disconnect the DC power supply and loosen the pressing plate 9 for discharging.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online electrolytic filter-pressing sludge reduction device, comprising a DC power supply, a compression plate (9), an insulating plate (8), an electrode plate, and a diaphragm (5), characterized in that: The inner sides of the two pressing plates (9) are arranged in sequence with an insulating plate (8), an electrode plate, a gasket (6), a water-permeable plate (2), a diaphragm (5) and a material frame (3); two water-permeable plates (2), two diaphragms (5) and a material frame (3) are arranged between the two electrode plates to form an electrolytic unit; the material frame (3) is arranged in the middle of the electrolytic unit, and the two sides of the material frame (3) are respectively provided with a diaphragm (5), a water-permeable plate (2) and an electrode plate, and multiple groups of electrolytic units are arranged between the two pressing plates (9).

2. The online electrolytic filter-pressing sludge reduction device according to claim 1 is characterized in that: A cathode plate (1), an anode plate (7), and a bipolar plate (4) are respectively arranged inside the electrode plate; the anode plate (7) is composed of a graphite plate or a DSA titanium anode plate; the cathode plate (1) is made of titanium, nickel, aluminum or stainless steel; the bipolar plate (4) is a DSA titanium anode plate with a one-side coating, and the interpolar distance is 10-50 mm.

3. The online electrolytic filter-pressing sludge reduction device according to claim 1 is characterized in that: The diaphragm (5) is a diaphragm filter cloth or a ceramic filter plate, and the diaphragm filter cloth is a polyester 103 filter cloth or a 240 filter cloth.

4. The online electrolytic filter-pressing sludge reduction device according to claim 1 is characterized in that: The water-permeable plate (2) is made of reinforced polypropylene or graphite plate. A flow guide hole (21) is arranged at the upper part or the middle part of the water-permeable plate (2) and communicates with the liquid inlet (10). Circular cushion columns (22) and connecting ribs (23) are distributed in the middle part of the water-permeable plate (2). The circular cushion columns (22) and connecting ribs (23) account for 30% to 50% of the area of ​​the water-permeable plate (2). The circular cushion columns (22) can support the diaphragm (5) to facilitate the filtrate of the diaphragm (5) to flow in the water-permeable plate (2). The filtrate of the diaphragm (5) is finally discharged from the liquid outlet (24).

5. The online electrolytic filter-pressing sludge reduction device according to claim 2 is characterized in that: When the cathode plate (1) and the anode plate (7) are both graphite plates, one side of the graphite plate is formed into a water-permeable plate (2) shape, so that the electrode plate and the water-permeable plate (2) are integrated into one, thereby eliminating the water-permeable plate (2) and the material frame (3).

6. The online electrolytic filter-pressing sludge reduction device according to claim 1 is characterized in that: The material of the material frame (3) is plastic or rubber. The length and width of the material frame (3) are the same as those of the water-permeable plate (2). The upper part of the material frame (3) is provided with a liquid inlet channel 1 (31) and a liquid inlet channel 2 (32).

7. The online electrolytic filter-pressing sludge reduction device according to claim 2 is characterized in that: The electrical connection method of the electrode plates is as follows: in a device composed of a plurality of electrolytic units, a cathode plate (1) and an anode plate (7) are arranged at two ends, the positive pole and the negative pole of the DC power supply are respectively connected to the conductive ears (71) of the anode plate (7) and the cathode plate (1) at the two ends, and the bipolar plate (4) is not connected with a conductive wire; in a device composed of a plurality of electrolytic units, the cathode plates (1) and the anode plates (7) are alternately arranged and connected in parallel, and the outside of each cathode plate (1) and the anode plate (7) is provided with a conductive ear (71) and is respectively connected in parallel to the positive pole and the negative pole of the DC power supply.

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