Device and method for enhancing sludge acidification and dewatering by radio frequency

Abstract

The application discloses a device and method for enhancing sludge acid production and dewatering by using radio frequency, and relates to the technical field of sludge treatment. The device comprises a capacitive load, a plate, and a radio frequency power supply. The radio frequency power supply is located outside the capacitive load and is electrically connected with the upper plate through a transmission cable. The lower plate is grounded. The radio frequency is rapidly and effectively applied to the inside of sludge, can penetrate sludge, destroy the structure of bacterial aggregates, release bound water, and thus promote sludge dewatering.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment, in particular to a device and method for enhancing sludge acid production and dewatering by radio frequency. BACKGROUND

[0002] In the process of sludge treatment, sludge dewatering is the most important step for sludge reduction, but also faces great challenges. Sludge dewatering is mainly affected by EPS (sludge extracellular polymers) in sludge, which hinders the release of bound water. At the same time, the cross-linked structure of organic matter and the existence of a large number of π-π bonds in sludge make the components of sludge more stable, and dewatering more difficult.

[0003] At present, the methods for sludge dewatering mainly include high-pressure filtration and electric mechanical dewatering after sludge conditioning, which includes physical conditioning, chemical conditioning and biological conditioning.

[0004] Among them, physical conditioning can use ultrasonic and microwave to condition sludge. Physical conditioning has the advantages of high efficiency, simple equipment, no introduction of additional substances to sludge, and no secondary pollution, but usually has high energy consumption, and often involves high temperature and high pressure conditions, which has certain difficulty in implementation and control.

[0005] Chemical conditioning has obvious solubilizing effect on sludge, and does not need a large amount of energy input, but will introduce additional substances into sludge, which may cause secondary pollution, and the large use of chemical reagents will lead to high cost.

[0006] Biological conditioning is an environmentally friendly way, but its speed is slow, the treatment effect is poor, and the biological activity needs strict environmental conditions, which has large application limitations.

[0007] Therefore, in actual application, one conditioning method is rarely used alone, and different conditioning methods are combined to condition sludge cooperatively.

[0008] The existing technology usually adopts the way of physical conditioning combined with chemical conditioning, for example, the application number CN201310066537.3 discloses a method for improving sludge production of short-chain fatty acids by hot alkali combined conditioning, which uses hot hydrolysis and alkali double synergistic effect on sludge to destroy sludge floc structure, disintegrate cells and release organic matter inside the cells to provide a large amount of available organic matter for subsequent anaerobic fermentation, thereby enhancing the production of short-chain fatty acids. However, the existing technology almost needs to add chemical reagents to reduce the resistance of cells in sludge to external force to improve the effect of physical conditioning. Therefore, the problems of introducing additional substances into sludge to cause secondary pollution and the huge energy consumption required by the conditioning method of physical conditioning sludge dewatering are difficult to solve.

[0009] Therefore, how to provide a sludge conditioning technology capable of solving the above problems is a technical problem that persons skilled in the art urgently need to solve. SUMMARY

[0010] The purpose of the present application is to provide a device and method for enhancing sludge acid production and dewatering by using radio frequency to solve the problems existing in the prior art.

[0011] To achieve the above-mentioned purpose, the present application provides the following solutions: The present application provides a device for enhancing sludge acid production and dewatering performance, comprising:

[0012] A capacitive load is communicated with a sludge inlet pipe and a sludge outlet pipe, a stirrer is arranged in the capacitive load, and a metal mesh is sleeved on the capacitive load to shield electromagnetic waves and prevent electromagnetic wave leakage; the capacitive load is a sealable container, which can provide a sealed anaerobic environment for later anaerobic fermentation, and has no shape restriction; the material can be selected from materials with low dielectric constant, and the thickness can be 1-10 cm; when glass material is used, it needs to be able to withstand high temperature of 100 DEG C. The stirrer is a submersible type stirrer, which meets the functional requirements of stirring sludge; it should be noted that the stirrer is generally made of metal material, and to avoid the influence of electromagnetic waves generated by the electrode plate, the stirrer should be placed far away from the upper electrode plate and the lower electrode plate, and not in the area between the upper electrode plate and the lower electrode plate.

[0013] An electrode plate is arranged in the capacitive load and fixedly connected with the inner side wall of the capacitive load, and the electrode plate is made of materials with good conductivity, such as aluminum and copper.

[0014] A radio frequency power supply is arranged outside the capacitive load and electrically connected with the upper electrode plate through a transmission cable, and the lower electrode plate is grounded.

[0015] A decanter is arranged in the capacitive load, the water inlet end of the decanter is movable between a first position and a second position, when the water inlet end of the decanter is located at the first position, the water inlet end of the decanter enters the area between the upper electrode plate and the lower electrode plate, when the water inlet end of the decanter is located at the second position, the water inlet end of the decanter exits the area between the upper electrode plate and the lower electrode plate, the decanter is communicated with a drain pipe and can suck supernatant in the capacitive load, and the drain pipe extends from the capacitive load to the outside; the decanter can be siphon type, mechanical type, etc., as long as the water inlet end can move between the first position and the second position, and the existing decanter can be used without special requirements.

[0016] An aeration pipe is arranged in the capacitive load, and the other end of the aeration pipe extends from the capacitive load to the outside and is communicated with an inert gas source; the inert gas is pumped into the aeration pipe by an aeration pump, and nitrogen or the like can be selected.

[0017] Further, it further comprises a telescopic structure, the bottom end of the telescopic structure is fixedly connected with the upper pole plate, and the top end is fixedly connected with the upper side wall of the capacitive load.

[0018] The application also provides a method for enhancing sludge acid production and dewatering by using radio frequency, and the method comprises the following steps of using the device for enhancing sludge acid production and dewatering performance.

[0019] S1: the sludge is sent into the capacitive load from the sludge inlet pipe, and the sludge is stirred;

[0020] S2: the radio frequency power supply is turned on, the radio frequency is adjusted, the radio frequency power between the upper pole plate and the lower pole plate is determined, and the sludge is radio frequency conditioned;

[0021] S3: part of the supernatant is led out from the capacitive load by using the water decanter, so that the water content of the sludge reaches the water content of anaerobic fermentation;

[0022] S4: the sludge is stirred, inoculated sludge containing acid-producing bacteria is added, the source of the inoculated sludge can be other exogenous anaerobic fermentation sludge or part of the backflow in the next anaerobic fermentation stage after sludge anaerobic fermentation, and the capacitive load is aerated to remove the residual oxygen in the capacitive load;

[0023] S5: anaerobic fermentation;

[0024] S6: the sludge after anaerobic fermentation is radio frequency conditioned, and the supernatant is removed by using the water decanter after radio frequency conditioning;

[0025] S7: the sludge is discharged from the sludge discharge pipe.

[0026] The application discloses the following technical effects:

[0027] 1. The application discards the existing chemical conditioning combined with physical conditioning mode, adopts radio frequency to act on the sludge inside quickly and effectively, can penetrate the sludge, destroy the structure of the zoogleal mass, release the bound water, and thus promote sludge dewatering.

[0028] 2. Compared with the ways of using ultrasonic and microwave to condition sludge, the radio frequency heating has very high energy efficiency, high energy utilization rate acting on the sludge, and can effectively reduce the sludge conditioning cost.

[0029] Preferably, the radio frequency of the radio frequency power supply is 1-300 MHz. The size of the electrode plate can be enlarged or reduced according to the power of the actual radio frequency power supply and the scale of the capacitive load. When the radio frequency electromagnetic wave is actually used to promote sludge dewatering, the larger the electrode plate area, the smaller the electromagnetic wave intensity, but the larger the amount of sludge that can be accommodated, so when the method is actually applied, the size of the electrode plate area needs to be determined in combination with the actual situation. The most important feature of radio frequency electromagnetic wave is different from that of microwave, that is, the frequency of radio frequency electromagnetic wave is smaller than that of microwave, and the penetration effect is better. Similarly, within the frequency band of radio frequency electromagnetic wave, the larger the frequency, the worse the penetration effect, but higher frequency can bring good vibration and thus improve its heat production effect. Therefore, the best radio frequency needs to be determined in combination with the actual sludge properties and output.

[0030] Preferably, the moisture content of the anaerobic fermentation is 99-99.5%, which can improve the anaerobic fermentation effect. The sludge in the present application can be sewage treatment plant sludge, industrial sewage treatment plant sludge and other biomass sludge. The properties of the sludge may affect the action of the radio frequency electromagnetic field, such as conductivity, organic matter composition, solid content, etc., but these properties only affect the promotion effect of radio frequency electromagnetic wave on sludge dewatering to a certain extent and do not affect its applicability, so the present application only limits the moisture content before anaerobic fermentation.

[0031] Preferably, the aeration time in step S4 is 1-30 min. The purpose of aeration is to remove oxygen in the system and provide an anaerobic environment for the bacterial flora in the sludge. The time is flexibly set according to the amount of sludge and the number of aeration heads.

[0032] Preferably, the anaerobic fermentation time in step S5 is 1-20 d. The purpose of anaerobic fermentation is to remove large molecules such as proteins in the sludge that affect the dewatering performance of the sludge. The removal rate is determined by a variety of factors, so the actual anaerobic fermentation time can be determined according to the removal rate of such large molecules.

[0033] Preferably, the radio frequency conditioning time in steps S2 and S6 is 1-60 min. The main purpose of radio frequency conditioning is to break the cells in the sludge to increase the content of soluble organic matter in the sludge; the main purpose of the second radio frequency conditioning is to quickly settle the sludge particles. The actual action time can be set according to the lysis rate of the actual sludge and the content of viscous macromolecules in the sludge.

[0034] Preferably, the distance between the upper and lower plates is 1-20 cm, and the surface area of the upper and lower plates is 14x14 cm 2 , and the size of the capacitive load is 16x16x20 cm 3 . The area of the capacitive load, the upper and lower plates, and the distance can be adjusted according to the actual sludge treatment capacity.

[0035] Further, in step S1, the sludge is stirred while adding an alkaline material to adjust the pH of the sludge to greater than 7 and less than or equal to 14. The applicant has found through experiments that the combination of radio frequency conditioning and alkaline material can further improve the organic matter solubilization and dewatering effect of the sludge, and the alkaline material can be sodium hydroxide, lime, etc. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 is a structural schematic diagram of the present application;

[0038] Figure 2 is Figure 1 a structural schematic diagram of the decanter in the present application;

[0039] Figure 3 is Figure 1 a structural schematic diagram of the telescopic structure in the present application;

[0040] Among them, 1, radio frequency power supply; 2, transmission cable; 3, upper plate; 4, telescopic structure; 5, lower plate; 6, grounding wire; 7, decanter; 8, drain pipe; 9, sludge inlet pipe; 10, sludge outlet pipe; 11, metal mesh; 12, stirrer; 13, aeration pipe; 14, water inlet pipe; 15, decanting port; 16, support; 17, air cylinder; 18, capacitive load; 19, shielded enclosure. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0043] With reference to Figure 1 , the present application provides a device for enhancing sludge acid production and dewatering by radio frequency, comprising: a capacitive load 18, which is communicated with a sludge inlet pipe 9 and a sludge outlet pipe 10, and is provided with a stirrer 12 inside and a metal mesh 11 outside; a polar plate, which comprises an upper polar plate 3 and a lower polar plate 5, and is arranged in parallel inside the capacitive load 18 and fixedly connected with the inner side wall of the capacitive load 18; a radio frequency power supply 1, which is located outside the capacitive load 18 and electrically connected with the upper polar plate 3 through a transmission cable 2, and the lower polar plate 5 is grounded through a grounding wire 6; a decanter 7, which is arranged inside the capacitive load 18, and the water inlet end of the decanter 7 is movable between a first position and a second position, when the water inlet end of the decanter 7 is located at the first position, the water inlet end of the decanter 7 enters the area between the upper polar plate 3 and the lower polar plate 5, when the water inlet end of the decanter 7 is located at the second position, the water inlet end of the decanter 7 exits the area between the upper polar plate 3 and the lower polar plate 5, the decanter 7 is communicated with a drain pipe 8, and the drain pipe 8 extends from the capacitive load 18 to the outside; an aeration pipe 13, one end of which is located inside the capacitive load 18, and the other end extends from the capacitive load 18 to the outside and is communicated with an inert gas source; and a telescopic structure 4, the bottom end of which is fixedly connected with the upper polar plate 3, and the top end is fixedly connected with the upper side wall of the capacitive load 18.

[0044] As Figure 2 shown, the decanter 7 is composed of a water inlet pipe 14, a support 16, a drain pipe 8 and a gas cylinder 17, the support 16 is arranged on the upper edge of the capacitive load 18, the water inlet pipe 14 is hingedly connected with the support 16, the drain pipe 8 is communicated with the water inlet pipe 14 and is bent at the connection, and can rotate together with the water inlet pipe 14. The decanter 7 is provided with a decanting opening 15 at the front end (i.e. the water inlet end of the decanter 7), the inner side wall of the capacitive load 18 is fixedly provided with the gas cylinder 17, the telescopic end of the gas cylinder 17 is fixedly connected with the water inlet pipe 14, the gas cylinder 17 can drive the decanter 7 to rotate up and down and can make the decanting opening 15 rotate between the first position and the second position, thereby realizing the function of sucking supernatant. When the decanting opening 15 is located at the second position, the support 16 is externally sealed to ensure the closed anaerobic environment inside the capacitive load 18. Alternatively, flexible sealing rubber is arranged at the support 16, which can ensure the closed anaerobic environment inside the capacitive load 18 regardless of the rotation of the water inlet pipe 14 and the drain pipe 8.

[0045] As Figure 3As shown, in the present embodiment, the capacitive load 18 is externally provided with a shielding shell 19 to improve the electromagnetic wave shielding effect, and the telescopic structure 4 is a telescopic motor which is fixed on the upper surface inside the shielding shell 19, and the telescopic end penetrates through the capacitive load 18 and is fixedly connected with the upper pole plate 3 to realize the function of adjusting the height of the upper pole plate 3, and the stirrer 12 directly adopts a submersible pump.

[0046] The method for enhancing the sludge acid production and dewatering performance of the device disclosed in Embodiment 1 is described below, including the following steps:

[0047] S1: Pump 1500 mL of diluted sludge (Volatile suspended solid (VSS) = 12.87 g / L) from the sludge inlet pipe 9 into the capacitive load 18 between the upper pole plate 3 and the lower pole plate 5, and the distance between the upper pole plate 3 and the lower pole plate 5 is 6 cm, and the pH of the sludge is adjusted to 11 while stirring the sludge;

[0048] S2: Turn on the radio frequency power supply 1, adjust the radio frequency to 27.12 MHz, and adjust the radio frequency output power and the reflected power so that the radio frequency power difference between the upper pole plate 3 and the lower pole plate 5 is 400 W (i.e. the electromagnetic wave power acting between the two pole plates), and the sludge is subjected to radio frequency conditioning for 30 min;

[0049] S3: Use the water decanter 7 to draw part of the supernatant from the capacitive load 18 to make the sludge moisture content reach the anaerobic fermentation moisture content;

[0050] S4: Stir the sludge, add inoculated sludge containing acid-producing bacteria, and at the same time, aerate the capacitive load 18 for 5 min to remove the remaining oxygen in the capacitive load 18;

[0051] S5: Anaerobic fermentation for 8 d;

[0052] S6: After anaerobic fermentation, the sludge is subjected to radio frequency conditioning, and after radio frequency conditioning, the supernatant is removed using the water decanter 7;

[0053] S7: The sludge is discharged from the sludge discharge pipe 10.

[0054] The results show that the capillary suction time (CST) of the diluted sludge treated by radio frequency for 30 min changes from 424 s to 1550.2 s, which is due to the dissolution of a large amount of viscous organic matter. Radio frequency treatment promotes the agglomeration of sludge flocs, and it can be observed that the sludge flocs change from uniform dispersion in the liquid phase to agglomeration in the liquid phase and then float or sink. After anaerobic fermentation, the sludge acid production is 2140 mg / L per day, and the CST of the sludge decreases to 398.5 s.

[0055] The 1500 mL diluted sludge of the same silt was treated by the traditional hot alkali conditioning, and the acid production was 1580 mg / L per day. After the conditioning and anaerobic fermentation of the sludge, the CST of the sludge was reduced from 980 s before the fermentation to 506 s. It can be seen that the device and method disclosed in the embodiment can simultaneously improve the output of volatile fatty acids and the dewatering performance of the sludge.

[0056] Example 2

[0057] The difference between the present embodiment and Example 1 is that 1500 mL of diluted sludge (VSS = 18.23 g / L) is pumped into the container load 18, and is placed between the upper electrode plate 3 and the lower electrode plate 5 with an electrode plate area of 14 x 14 cm 2 , and a plate spacing of 6 cm. The radio frequency output frequency of 40.68 MHz is selected, the radio frequency power supply 1 switch is turned on, the radio frequency output power and the reflected power are adjusted, the electromagnetic wave power of 500 W acting between the two electrode plates is transmitted to the electrode plate, and the time is maintained for 3, 5, 7, and 9 minutes, respectively.

[0058] The results show that the dewatering effect of the diluted sludge treated by the radio frequency for 3 minutes is the best. The sludge volume index (SVI%) of the untreated diluted sludge and the diluted sludge treated by the radio frequency for 3, 5, 7, and 9 minutes is 81.2, 60.5, 72.6, 85.3, and 88.6, respectively. The shorter radio frequency treatment can effectively improve the dewatering performance of the sludge, but too long radio frequency treatment will cause the sludge dewatering performance and the settling performance to be poor due to the dissolution of too much sticky substances (such as polysaccharides and proteins). After the diluted sludge is treated by the radio frequency for 3 minutes, the supernatant is discharged through the decanter 7, and the water content of the sludge is reduced from 99.56% to 94.81%. After the diluted sludge is treated by the radio frequency for 3 minutes, the specific resistance to filtration (SRF) of the diluted sludge is reduced from 6.00 x 10 16 m / kg to 5.06 x 10 16 m / kg.

[0059] Example 3

[0060] The difference between the present embodiment and Example 1 is that 1500 mL of diluted sludge (VSS = 18.23 g / L) is pumped into the container load 18, and is placed between the upper electrode plate 3 and the lower electrode plate 5 with an electrode plate area of 14 x 14 cm 2The RF power source 1 switch is turned on, the RF output power and the reflected power are adjusted, the electromagnetic wave power between the two plates is 400W, and after 15 minutes, part of the supernatant is discharged through the decanter 7, and the water content of the sludge is reduced from 99.32% to 98.97%. After the sludge is cooled, inoculated sludge containing acid-producing bacteria is added, the container load 18 is aerated for 5 minutes to remove residual oxygen in the container load 18, the sludge is stirred, and anaerobic fermentation is performed for 10 days. After the sludge is subjected to anaerobic fermentation, the stirring is stopped, and the sludge is subjected to RF treatment again for 5 minutes, and the sludge is obviously settled.

[0061] The results show that after the sludge is subjected to anaerobic fermentation and RF conditioning, the supernatant is discharged through the decanter 7, the water content of the sludge is reduced from 98.97% to 96.55%, and the volume of the sludge is reduced to 29.86% of the original. Through secondary RF conditioning, the volume of the sludge can be quickly and significantly reduced, and the transportation and disposal costs can be reduced.

[0062] Comparative Example 1

[0063] In Comparative Example 1, the sludge is treated by 900W microwave (2450MHz) and 15W RF (40.68MHz) for 60s and 40s respectively, and the CST is reduced by 42.7% and 23% respectively. The CST reduction per unit power is 0.47% / W and 1.53% / W, and the RF conditioning of the sludge shows better dewatering effect in terms of CST reduction effect.

[0064] Comparative Example 2

[0065] In Comparative Example 2, the sludge is conditioned by fast Fenton method, and after 90 minutes of treatment at pH 3, the CST is reduced by 68%. After the sludge is treated by RF (27.12MHz) for 5 minutes, the CST is reduced by 46.44%. The CST reduction per unit time is 0.76% / min and 9.29% / min respectively, and it can be seen that the RF conditioning of the sludge is a fast sludge dewatering conditioning method.

[0066] Comparative Example 3

[0067] In Comparative Example 3, the sludge is conditioned by hot alkali (treatment time 60min, pH 11) for anaerobic fermentation (SRT 8). The daily acid production is 1580±460mg / L.

[0068] In this example, the sludge is conditioned by RF combined with alkaline material (treatment time 30min, pH 11) using the device disclosed in Example 1 for anaerobic fermentation (SRT 8), and the daily acid production is 2140±326mg / L. It can be seen that the acid production of this example can be significantly improved compared with the hot alkali conditioning.

[0069] Comparative Example 4

[0070] Comparative Example 4 uses radio frequency to treat sludge with pH of 7 (without adding alkali) and 11 (adding alkali) for 30 minutes, and then anaerobic fermentation. The acid production at pH 7 is 912±122g / L per day, and the acid production at pH 11 is 2140±326g / L per day. It can be seen that the sludge treated by radio frequency and alkali has better anaerobic fermentation effect and higher acid production, because the addition of alkali not only enhances the lysis effect of the sludge, but also provides an alkaline condition that is conducive to acid production in the anaerobic fermentation stage of the sludge (more acid is produced by bacteria in the anaerobic fermentation of sludge under alkaline conditions, and alkaline conditions are conducive to the accumulation of organic acids in the system). In addition, if the amount of alkaline material added is appropriate, there will be no secondary pollution, which is fundamentally different from the secondary pollution caused by the addition of chemicals in the prior art.

[0071] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0072] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A method for enhancing sludge acidification and dewatering using radio frequency, characterized in that, An application of a device for enhancing sludge acidification and dewatering using radio frequency (RF), the device comprising: A capacitive load (18) is connected to a mud inlet pipe (9) and a mud outlet pipe (10). An agitator (12) is installed inside the capacitive load (18). A metal mesh (11) is installed outside the capacitive load (18). The electrode plate includes an upper electrode plate (3) and a lower electrode plate (5), which are arranged parallel to each other in the capacitive load (18). Radio frequency power supply (1), the radio frequency power supply (1) is located outside the capacitive load (18) and electrically connected to the upper electrode plate (3) through the transmission cable (2), and the lower electrode plate (5) is grounded; A decanter (7) is disposed within the capacitive load (18). The inlet end of the decanter (7) is movable between a first position and a second position. When the inlet end of the decanter (7) is in the first position, the inlet end of the decanter (7) enters the area between the upper electrode plate (3) and the lower electrode plate (5). When the inlet end of the decanter (7) is in the second position, the inlet end of the decanter (7) exits the area between the upper electrode plate (3) and the lower electrode plate (5). The decanter (7) is connected to a drain pipe (8), which extends from the capacitive load (18) to the outside. An aeration pipe (13) is located at one end inside the capacitive load (18) and at the other end extends outward from the capacitive load (18) and is connected to an inert gas source. The telescopic structure (4) is fixedly connected at its bottom end to the upper electrode plate (3) and at its top end to the upper side wall of the capacitive load (18). Includes the following steps: S1: The sludge is fed into the capacitive load (18) through the sludge inlet pipe (9) and stirred; while stirring, alkaline materials are added to adjust the pH of the sludge to greater than 7 and less than or equal to 14. S2: Turn on the radio frequency power supply (1), adjust the radio frequency, determine the radio frequency power between the upper electrode plate (3) and the lower electrode plate (5), and perform radio frequency conditioning on the sludge; S3: Use the decanter (7) to draw out part of the supernatant from the capacitive load (18) so that the sludge moisture content reaches the anaerobic fermentation moisture content; S4: Stir the sludge, add inoculated sludge containing acid-producing bacteria, and aerate the bulk load (18) to remove the remaining oxygen in the bulk load (18). S5: Anaerobic fermentation; S6: Radio frequency conditioning is performed on the sludge after anaerobic fermentation, and the supernatant is removed by decanter (7) after radio frequency conditioning; S7: Discharge the sludge from the sludge discharge pipe (10).

2. The method for enhancing sludge acidification and dewatering using radio frequency enhancement according to claim 1, characterized in that, The radio frequency of the radio frequency power supply (1) is 1~300MHz.

3. The method for enhancing sludge acidification and dewatering using radio frequency enhancement according to claim 1, characterized in that, The anaerobic fermentation process has a moisture content of 99-99.5%.

4. The method for enhancing sludge acidification and dewatering using radio frequency enhancement according to claim 1, characterized in that, The aeration time in step S4 is 1-30 minutes.

5. The method for enhancing sludge acidification and dewatering using radio frequency enhancement according to claim 1, characterized in that, The anaerobic fermentation time in step S5 is 3-20 days.

6. The method for enhancing sludge acidification and dewatering using radio frequency enhancement according to claim 1, characterized in that, The radio frequency conditioning time in steps S2 and S6 is 1-60 min.

7. The method for enhancing sludge acidification and dewatering using radio frequency enhancement according to claim 1, characterized in that, The distance between the upper electrode plate (3) and the lower electrode plate (5) is 1-20 cm, and the surface area of ​​both the upper electrode plate (3) and the lower electrode plate (5) is 14×14 cm. 2 The capacitive load (18) has a size of 16×16×20cm. 3 .

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