A high-energy electromagnetic multiphase catalytic enhanced sludge cracking device and sludge treatment method

Abstract

The application discloses a high-energy electromagnetic multi-phase catalytic reinforced sludge cracking device and a sludge treatment method. The device comprises a high-energy electromagnetic generator, a high-energy electromagnetic radio frequency rod, a multi-phase catalytic reactor and a solid-liquid separator; the high-energy electromagnetic generator is connected with the high-energy electromagnetic radio frequency rod through a wave guide, and the lower part of the high-energy electromagnetic radio frequency rod is inserted into the multi-phase catalytic reactor; and the discharge port of the multi-phase catalytic reactor is connected with the separator inlet of the solid-liquid separator through a pipeline. The high-energy electromagnetic technology, the multi-phase catalytic technology and the solid-liquid separation technology are coupled, so that the sludge treatment efficiency is improved, the treatment process is simplified, and the system operation energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment and resource utilization, and particularly relates to a high-energy electromagnetic multi-phase catalytic reinforced sludge cracking device and a sludge treatment method. BACKGROUND

[0002] Sludge is the end product of the entire sewage treatment process, and its output increases significantly as the sewage treatment capacity in China continues to improve. Sludge is rich in pollutants (recalcitrant organic matter, harmful bacteria, heavy metals, microplastics, etc.) and nutrients (organic carbon, nitrogen, phosphorus, etc.) in sewage, making it have the dual attributes of "pollution" and "resource". The overall characteristics are complex composition, poor stability and difficult treatment. If sludge is discharged without effective treatment, it will inevitably cause serious environmental pollution and resource waste. How to realize the stabilization and harmless treatment of sludge while recycling resources from sludge and reducing carbon emissions has become an important direction of sludge treatment and disposal.

[0003] Sludge contains a large amount of organic matter. Compared with incineration, sanitary landfill and organic composting, anaerobic fermentation is a better way to realize sludge resource utilization. In the process of sludge anaerobic fermentation, microorganisms degrade the organic matter in sludge into useful resources, including volatile fatty acids (VFAs), methane, hydrogen, etc., through processes such as hydrolysis, acidification, hydrogen production, acetic acid production and methanation. However, microbial hydrolysis and extracellular polymeric substance (EPS) degradation are rate-limiting steps in the process of sludge anaerobic fermentation, resulting in a long fermentation period and low yield of useful resources. High-energy electromagnetic, as a technology that converts electrical energy into electromagnetic waves, can effectively destroy sludge floc structure and break microbial cell walls through molecular resonance and generation of hydroxyl radicals, thereby promoting sludge hydrolysis and acidification. However, there are problems such as low utilization rate of hydroxyl radicals, difficulty in solid-liquid separation and high overall energy consumption. Multi-phase catalytic technology refers to the addition of catalytic fillers to the reaction system to improve the efficiency of sludge anaerobic digestion. There is little research on the coupling technology of high-energy electromagnetic and multi-phase catalysis, and no related reaction devices have been reported. SUMMARY

[0004] The present application provides a high-energy electromagnetic multi-phase catalytic reinforced sludge cracking device and a sludge treatment method to fill the gap in the above-mentioned field. The present application can significantly improve the efficiency of sludge treatment and reduce the energy consumption of the system.

[0005] In the first aspect, the present application provides a high-energy electromagnetic multi-phase catalytic reinforced sludge cracking device, which is realized by the following technical scheme.

[0006] The application discloses a high-energy electromagnetic multi-phase catalytic enhanced sludge cracking device, which comprises a high-energy electromagnetic generator, a high-energy electromagnetic radio frequency rod, a multi-phase catalytic reactor and a solid-liquid separator; the high-energy electromagnetic generator is connected with the high-energy electromagnetic radio frequency rod through a wave guide, and the lower part of the high-energy electromagnetic radio frequency rod is inserted into the multi-phase catalytic reactor; and the discharge port of the multi-phase catalytic reactor is connected with the separator inlet of the solid-liquid separator through a pipeline.

[0007] Further, the high-energy electromagnetic radio frequency rod is inserted into the multi-phase catalytic reactor through an insertion port above the shell and is fixed to the multi-phase catalytic reactor through a flange.

[0008] Further, the high-energy electromagnetic radio frequency rod is inserted into the multi-phase catalytic reactor through an insertion port above the shell and is fixed to the multi-phase catalytic reactor through a flange.

[0009] Further, the high-energy electromagnetic radio frequency rod is inserted into the multi-phase catalytic reactor through an insertion port above the shell and is fixed to the multi-phase catalytic reactor through a flange.

[0010] Further, the multi-phase catalytic reactor is provided with a feeding port and a gas inlet on one side, a discharge port on the other side, a gas outlet on the top and a sludge discharge port on the bottom.

[0011] Further, the multi-phase catalytic reactor is provided with a feeding port and a gas inlet on one side, a discharge port on the other side, a gas outlet on the top and a sludge discharge port on the bottom.

[0012] Further, the solid-liquid separator is selected from a horizontal centrifuge, a track-type filter press or a plate-and-frame filter press.

[0013] The application further provides a method for treating sludge by using the high-energy electromagnetic multi-phase catalytic enhanced sludge cracking device.

[0014] The method for treating sludge by using the device comprises the following steps: making the sludge enter the multi-phase catalytic reactor filled with fillers, starting the high-energy electromagnetic generator after setting the frequency and amplitude of the high-energy electromagnetic generator, and introducing nitrogen into the multi-phase catalytic reactor, so that the sludge is cracked under the action of the high-energy electromagnetic waves emitted by the high-energy electromagnetic rod; and the reacted sludge is transferred into the solid-liquid separator, and the liquid phase and the solid phase are discharged through the liquid outlet and the solid outlet of the solid-liquid separator respectively.

[0015] Further, the high-frequency electromagnetic waves generated by the high-energy electromagnetic generator have a frequency of 20 KHZ-200 GHZ and an amplitude of 20-90%.

[0016] Further, the filler is selected from one or more of immobilized biological enzyme, modified alumina, modified activated carbon, modified phenolic resin, the particle size is 2mm-30mm, the specific surface area is 400m 2 / m 3 -2000m 2 / m 3 ; the filling pile height of the filler is 1 / 5-1 / 4 of the height of the multi-phase catalytic reactor cylinder.

[0017] Further, the internal temperature of the multi-phase catalytic reactor is maintained at 20℃-90℃, and the residence time of the sludge is 1h-72h.

[0018] The application has the following beneficial effects.

[0019] 1. The application couples high-energy electromagnetic technology, multi-phase catalytic technology and solid-liquid separation technology to improve the sludge treatment efficiency and simplify the treatment process;

[0020] 2. The fillers used in the multi-phase catalytic reactor are modified fillers with catalytic function, which can strengthen the hydrolysis rate and acidification rate of microorganisms on the sludge by providing active sites, and make the molecular resonance, hydroxyl radical and other effects more efficient under the assistance of the high-energy electromagnetic radio frequency rod, thereby reducing the system operation energy consumption;

[0021] 3. The solid-liquid separator in the application can realize efficient separation of the treated sludge, effectively avoid the loss of catalytic fillers, and reduce the land occupation area of the device. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the application;

[0023] Figure 2 is a top view of the multi-phase catalytic reactor of the application

[0024] Wherein: 1. high-energy electromagnetic generator; 2. high-energy electromagnetic radio frequency rod; 3. multi-phase catalytic reactor; 4. solid-liquid separator; 101. waveguide; 102. feed inlet; 103. gas inlet; 104. discharge outlet; 105. gas outlet; 106. sludge discharge port; 107. separator inlet; 108. liquid outlet; 109. solid outlet; 110. filler; 111. temperature and pressure detector; 112. flange. DETAILED DESCRIPTION

[0025] The technical solutions of the application will be described clearly and completely in the following specific embodiments.

[0026] As Figures 1-2As shown, a high-energy electromagnetic multi-phase catalytic enhanced sludge cracking device includes a high-energy electromagnetic generator 1, a high-energy electromagnetic radio frequency rod 2, a multi-phase catalytic reactor 3, and a solid-liquid separator 4.

[0027] The high-energy electromagnetic generator 1 is connected to the high-energy electromagnetic radio frequency rod 2 through a wave guide 101, and the high-energy electromagnetic generator 1 generates high-frequency electromagnetic waves with a frequency of 20 KHZ-200 GHZ and an amplitude of 20-90%.

[0028] The high-energy electromagnetic radio frequency rod 2 extends to the multi-phase catalytic reactor 3 through an insertion port on the top of the shell and is fixed to the multi-phase catalytic reactor 3 by a flange 112. The wave guide 101 is located above the flange 112, and the high-energy electromagnetic radio frequency rod 2 is located below the flange 112. The part outside the multi-phase catalytic reactor 3 has no radiation electromagnetic wave function. The high-energy electromagnetic radio frequency rod 2 is in the shape of a cylindrical rod made of titanium alloy composite graphene material and has a composite metal coating of nickel, iron, and copper on the surface. The high-energy electromagnetic radio frequency rod 2 can uniformly radiate electromagnetic waves around the cylindrical rod, with a quantity of 2-4, uniformly distributed on the top view (Fig. 7), the insertion depth does not exceed three-quarters of the height of the multi-phase catalytic reactor 3 cylinder, and the distance between the bottom of the high-energy electromagnetic radio frequency rod 2 and the bottom of the multi-phase catalytic reactor 3 cylinder is not less than 300 mm. Figure 2

[0029] The material of the multi-phase catalytic reactor 3 is preferably stainless steel 316L, and the shape is preferably a cylinder. One end is provided with a feed inlet 102 and a gas inlet 103, the other end is provided with a discharge outlet 104, the upper end is provided with a gas outlet 105 for discharging the generated tail gas, and the lower end is provided with a mud discharge port 106 in the middle. The mud discharge port 106 can be used to remove residual sludge or drain water during cleaning after the reaction is completed; the inside is filled with a filler 110 with catalytic sludge cracking function, and the filling height of the filler is 1 / 5-1 / 4 of the height of the multi-phase catalytic reactor 3 cylinder. The filler is immobilized biological enzyme, modified alumina, modified activated carbon, and modified phenolic resin, with a particle size of 2mm-30mm and a specific surface area of 400m 2 / m 3 -2000m 2 / m 3 ; The multi-phase catalytic reactor 3 is provided with a detector 111 for real-time monitoring of the temperature and pressure in the reactor. When the internal pressure exceeds 2MPa, the valve of the gas outlet 105 should be opened immediately to ensure the safety of the equipment operation; during the sludge treatment stage, the internal temperature of the multi-phase catalytic reactor 3 is maintained at 20℃-90℃, and the residence time of the sludge is 1h-72h.

[0030] ​The solid-liquid separator 4 is connected to the multiphase catalytic reactor 3 through the discharge port 104 and the separator inlet 107. The connecting pipeline is preferably a steel wire-lined pipeline. The solid-liquid separator 4 is a horizontal centrifuge, a crawler filter press, or a plate and frame filter press. After the sludge passes through the solid-liquid separator 4, the solid content of the liquid phase is less than 2%.

[0031] The process of the sludge treatment in this invention is as follows: The sludge is directly fed into the multiphase catalytic reactor 3 through the feed inlet 102. After the frequency and amplitude of the high-energy electromagnetic generator 1 are set, it is turned on. Nitrogen gas is introduced through the gas inlet 103. The sludge undergoes a cracking reaction under the action of the high-energy electromagnetic waves emitted by the high-energy electromagnetic rod 2. The generated gas is discharged from the gas outlet 105. The composition of the discharged gas is analyzed periodically to determine whether the reaction is proceeding normally. The sludge after the reaction enters the solid-liquid separator 4. The sludge after the reaction treatment is discharged from the device through the liquid outlet 108 and the solid outlet 109 of the solid-liquid separator 4.

[0032] Example 1

[0033] The residual sludge generated from the secondary sedimentation tank of the wastewater treatment biochemical system of a refining and chemical enterprise in Guangdong Province is treated using a combination of flocculation conditioning and incineration. Due to the presence of recalcitrant organic matter such as emulsified oil in the sludge, the amount of flocculant used is large, resulting in high treatment costs. A pilot-scale test of a high-energy electromagnetic multiphase catalytic enhanced sludge pyrolysis device according to this invention was conducted. In this device, the high-energy electromagnetic generator produces high-frequency electromagnetic waves at a frequency of 50 kHz and an amplitude of 60%. Four high-energy electromagnetic radio frequency rods (model: PG5W207) are inserted to a depth of three-quarters of the height of the multiphase catalytic reactor cylinder. The packing material is stacked to a height of one-fifth of the height of the multiphase catalytic reactor cylinder. The packing material is modified alumina (model: KH560) with a particle size of 8 mm and a specific surface area of ​​1800 m². 2 / m 3 The solid-liquid separator is a plate and frame filter press. The experimental results are shown in Table 1. When the residence time of the sludge in the multiphase catalytic reactor is 1 hour and the internal temperature of the reactor is maintained at 90℃, the treated sludge can achieve a moisture content ≤60% with low energy consumption. The moisture content of the sludge after treatment is reduced to 53%, and the solid content of the liquid phase is 0.7%, corresponding to an energy consumption of 7.5 kWh / m³. 3 It can achieve better solid-liquid separation of sludge, and the sludge can be treated as general solid waste.

[0034] Table 1 Results of sludge treatment experiment in Example 1

[0035]

[0036]

[0037] Example 2

[0038] The residual sludge generated by the secondary sedimentation tank of a biochemical system of a sewage treatment in an industrial park in Tianjin is treated by flocculation conditioning and then transported out, the treated sludge has high water content and large sludge quantity, and a high-energy electromagnetic multi-phase catalytic sludge cracking device is additionally arranged for treatment. The high-frequency electromagnetic wave frequency generated by the high-energy electromagnetic generator of the device is set to 20 KHZ, the amplitude is 80%, there are two high-energy electromagnetic radio frequency rods (model: PG2W201), the insertion depth is three-fifths of the height of the multi-phase catalytic reactor cylinder, the packing stacking height is 1 / 4 of the height of the multi-phase catalytic reactor cylinder, the packing is immobilized biological enzyme (model: NP615), the particle size is 15 mm, the specific surface area is 900 m 2 / m 3 , and the solid-liquid separator is a track-type filter press. The test results are shown in Table 2, when the residence time of the sludge in the multi-phase catalytic reactor is 24 h and the internal temperature of the multi-phase catalytic reactor is maintained at 35℃, the treated sludge can achieve a water content of ≤60% and low energy consumption, the water content of the treated sludge is 60%, the solid content of the liquid phase is 0.3%, and the liquid phase contains volatile fatty acids VFAs, the liquid phase can be returned to the biochemical system as a denitrification carbon source, the device reduces the amount of reagent used and reduces the energy consumption of the system.

[0039] Table 2 sludge treatment test results of Example 2

[0040] Residence time h Temperature °C Sludge moisture content % Liquid phase solids content % 12 35 72 1.2 12 50 64 0.6 24 35 60 0.3 24 50 58 1.1 36 35 56 0.8 36 50 51 0.6

[0041] The above-described examples are merely preferred embodiments of the present application and do not limit the concept and scope of the present application, various modifications and improvements to the technical solutions of the present application made by ordinary engineering technicians in the art without departing from the design concept of the present application shall fall within the protection scope of the present application, the technical content claimed by the present application has been fully recorded in the technical requirements.

Claims

1. A high-energy electromagnetic multiphase catalytic enhanced sludge cracking device, characterized in that: It comprises a high-energy electromagnetic generator (1), a high-energy electromagnetic radio frequency rod (2), a multiphase catalytic reactor (3) and a solid-liquid separator (4); the high-energy electromagnetic generator (1) is connected with the high-energy electromagnetic radio frequency rod (2) through a wave guide (101), and the lower part of the high-energy electromagnetic radio frequency rod (2) is inserted into the multiphase catalytic reactor (3); the discharge port (104) of the multiphase catalytic reactor (3) is connected with the separator inlet (107) of the solid-liquid separator (4) through a pipeline.

2. A high-energy electromagnetic multiphase catalytic enhanced sludge cracking device according to claim 1, characterized in that: The high-energy electromagnetic radio frequency rod (2) extends into the multiphase catalytic reactor (3) through an upper insertion port of the shell and is fixed with the multiphase catalytic reactor (3) by a flange (112).

3. A high-energy electromagnetic multiphase catalytic enhanced sludge disintegration device according to claim 1, characterized in that: The high-energy electromagnetic radio frequency rod (2) is provided with 2-4 rods, and the insertion depth is not more than three quarters of the height of the cylinder of the multiphase catalytic reactor (3), and the distance between the bottom of the high-energy electromagnetic radio frequency rod (2) and the bottom of the cylinder of the multiphase catalytic reactor (3) is not less than 300 mm.

4. A high-energy electromagnetic multiphase catalytic enhanced sludge disintegration device according to claim 1, characterized in that: The high-energy electromagnetic radio frequency rod (2) is made of titanium alloy composite graphene material and coated with a composite metal coating of nickel, iron and copper on the surface.

5. A high-energy electromagnetic multiphase catalytic enhanced sludge disintegration device according to claim 1, characterized in that: The multiphase catalytic reactor (3) is provided with a temperature and pressure detector (111) for monitoring the temperature and pressure in the reactor.

6. A high-energy electromagnetic multiphase catalytic enhanced sludge disintegration device according to claim 1, characterized in that: The solid-liquid separator (4) is selected from a horizontal centrifuge, a track-type filter press or a plate-and-frame filter press.

7. A method for treating sludge using the apparatus according to any one of claims 1 to 6, characterized in that: The steps are as follows: the sludge enters the multiphase catalytic reactor (3) filled with fillers (110), the high-energy electromagnetic generator (1) is started after the frequency and amplitude are set, and nitrogen is introduced into the multiphase catalytic reactor (3), and the sludge is subjected to a cracking reaction under the action of the high-energy electromagnetic waves emitted by the high-energy electromagnetic radio frequency rod (2); the reacted sludge is transferred to the solid-liquid separator (4), and the liquid phase and the solid phase after solid-liquid separation are discharged through the liquid outlet (108) and the solid outlet (109) of the solid-liquid separator (4) respectively.

8. The method of claim 7, wherein: The high-frequency electromagnetic waves generated by the high-energy electromagnetic generator (1) have a frequency of 20 KHZ-200 GHZ and an amplitude of 20-90%.

9. The method of claim 7, wherein: The filler (110) is selected from one or more of immobilized biological enzyme, modified alumina, modified activated carbon, and modified phenolic resin, with a particle size of 2 mm-30 mm, a specific surface area of 400 m 2 / m 3 -2000 m 2 / m 3 ; and a filler loading and stacking height of 1 / 5-1 / 4 of the height of the multi-phase catalytic reactor (3) cylinder.

10. The method of claim 7, wherein: The internal temperature of the multiphase catalytic reactor (3) is maintained at 20-90℃, and the residence time of the sludge is 1-72 h.

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