Ion decomposition deodorization device and method

Abstract

The invention relates to a sludge treatment system comprising: a housing (10) defining a housing chamber (1), the housing (10) extending about a horizontal central axis (109); a hollow shaft (2) arranged parallel to the horizontal central axis (109) and supported by the housing (10); the filter screen fixing piece (4) is arranged on the lower part of the shell (10); a filter screen (3) fixed to the lower portion of the housing (10) by a filter screen fixing member (4); an ion generation unit (7); the fan (8) is arranged at the upstream of the ion generation unit (7); and the electrolysis power supply comprises a positive electrode (6) electrically connected with the hollow shaft (2) and a negative electrode (5) electrically connected with the filter screen fixing piece (4). The invention also relates to a sludge treatment method.

Description

Technical Field

[0001] The present disclosure relates to an apparatus and method for ion decomposition and deodorization, and more particularly to a sludge treatment system and a sludge treatment method. Background Art

[0002] The activated sludge treatment method for urban sewage uses activated sludge to absorb pollutants in sewage, so that the sewage can be purified. The pollutants are degraded under the physiological metabolism of the activated sludge microorganisms. In order to maintain the production balance of the sewage treatment system, part of the activated sludge needs to be discharged. The activated sludge discharged from the sewage treatment system is called residual sludge.

[0003] The particle size of residual sludge is about 100nm, with a large specific surface area and a density similar to that of water. It is mainly composed of active microbial communities such as bacteria, viruses, protozoa, their own oxidized residues, and adsorbed difficult-to-degrade organic and inorganic substances.

[0004] More than 50% of the dry weight of microorganisms is protein. Protein can dissociate into cations and anions in water, and its isoelectric point pH value is 2-5. At this time, the degree of protein dissociation of cations and anions is equal, and the microorganism is electrically neutral. If the pH value of the system is greater than the pH value of the isoelectric point, the microorganism will transfer protons and carry a negative charge. In sewage treatment, activated sludge can only metabolize and survive normally in a neutral or alkaline state. The pH value of the system is greater than the pH value of the isoelectric point of the microorganism, so the microorganism is negatively charged. The charge of the microorganism determines the charge of the residual sludge, so the residual sludge is also negatively charged.

[0005] At the same time, due to the large specific surface area of ​​the residual sludge, the adsorption performance is high. Non-metallic oxides and negatively charged large ionic inorganic substances such as nitrogen, sulfur, phosphorus, and silicon oxygen-containing acid radicals in the sewage are easily adsorbed by it, making the electrokinetic potential of the sludge particles more electronegative.

[0006] Therefore, there is a need for a sludge treatment system and a sludge treatment method that can effectively treat excess sludge. Summary of the invention

[0007] In one aspect, the present invention provides a sludge treatment system, comprising: A shell body, wherein the shell body defines a shell chamber, the shell body extends around a horizontal central axis, and the shell body is provided with a sludge inlet, a sludge outlet, an exhaust port, and a drain port; a hollow shaft, the hollow shaft being arranged parallel to the horizontal central axis and supported by the shell, the hollow shaft comprising a main shaft portion arranged in the shell and a protruding portion extending out of the shell at one end of the hollow shaft, the main shaft portion comprising a main shaft internal chamber and a main shaft air outlet, the main shaft air outlet being in fluid communication with the main shaft internal chamber and extending through a side wall of the main shaft portion; a filter holder disposed on a lower portion of the housing; a filter screen secured to a lower portion of the housing by a filter screen retainer; an ion generating unit disposed within the extended portion of the hollow shaft and configured to ionize air entering the interior chamber of the spindle to generate cations and anions; a blower in fluid communication with the spindle internal chamber and disposed upstream of the ion generating unit, the blower being configured to blow air at a predetermined flow rate into the spindle internal chamber; and An electrolytic power source, the electrolytic power source comprising a positive electrode electrically connected to the hollow shaft and a negative electrode electrically connected to the filter fixing member; Among them, the positive electrode and the negative electrode are configured to generate an electric field between the hollow shaft and the filter fixing part to dry the sludge; the positive electrode is configured to make the hollow shaft positively charged, and a part of the anions generated by the ion generating unit are adsorbed and neutralized by the positive charge on the hollow shaft; the cations generated by the ion generating unit enter the sludge to facilitate the drying of the sludge.

[0008] In one example, the hollow shaft is rotatable around a horizontal central axis, and the sludge treatment system further comprises a plurality of hollow branch pipes arranged around a main shaft portion of the hollow shaft, the hollow branch pipe comprising a hollow branch pipe inlet arranged at a first end of the hollow branch pipe, an end face air outlet arranged at an opposite second end of the hollow branch pipe, a hollow branch pipe internal chamber extending between the branch pipe inlet and the end face air outlet, and a plurality of branch pipe holes arranged on a side wall of the hollow branch pipe and connected to the branch pipe internal chamber fluid, the branch pipe internal chamber being connected to the main shaft internal chamber fluid via the branch pipe inlet and the main shaft air outlet.

[0009] In one example, the hollow branch further includes blades disposed on an outer surface of the hollow branch.

[0010] In one example, the vanes extend along the axis of the hollow branch.

[0011] In one example, the plurality of hollow branches are arranged in a plurality of rows along the main shaft portion of the hollow shaft, each row comprising a group of hollow branches spaced apart around a corresponding outer circumference of the main shaft portion of the hollow shaft.

[0012] In one example, the blades extend obliquely relative to the axis of the hollow branch.

[0013] In one example, the plurality of hollow branches are spaced apart in a spiral path on the outer surface of the main shaft portion of the hollow shaft.

[0014] In one example, the ion generating unit includes a high voltage positive electrode ring and a high voltage negative electrode ring.

[0015] In one example, the shell is cylindrical, including a cylindrical side wall extending around a horizontal central axis, a first circular end plate close to the ion generating unit and a second circular end plate away from the ion generating unit, the sludge inlet is arranged at the top of the cylindrical side wall of the shell, the sludge outlet is arranged at the bottom of the second circular end plate of the shell, the exhaust port is arranged at the top of the cylindrical side wall of the shell, and the drain port is arranged at the bottom of the cylindrical side wall of the shell.

[0016] In one example, the shell is composed of a lower part of a semicircular cross-section and an upper part of a rectangular cross-section, including a lower semi-cylindrical side wall extending around a horizontal central axis, a pair of upper side walls extending vertically upward from the top end of the lower semi-cylindrical side wall, a top plate extending between the pair of upper side walls, a first end plate close to the ion generating unit and a second end plate away from the ion generating unit, a sludge inlet is arranged at the top plate of the shell, a sludge outlet is arranged at the bottom of the second end plate of the shell, an exhaust port is arranged at the top plate of the shell, and a drain port is arranged at the bottom of the lower semi-cylindrical side wall of the shell.

[0017] In one example, the filter holder is made of metal and is mounted to the housing via an insulating frame.

[0018] In one example, the filter fixing member is made of metal, and an insulating member is disposed on the outer surface thereof.

[0019] In another aspect, the present invention provides a sludge treatment method for drying sludge using the sludge treatment system described above, comprising: Introducing the sludge to be dried into the housing chamber through the sludge inlet; The electrolysis power supply is turned on, and the ion generating unit and the fan are started, so that the ion generating unit generates cations and anions, the hollow shaft is positively charged, and a part of the anions generated by the ion generating unit is adsorbed and neutralized by the positive charge on the hollow shaft; the cations generated by the ion generating unit enter the sludge to facilitate the drying of the sludge; and After the sludge is dried, the dried sludge is discharged through the sludge outlet.

[0020] The above features and advantages of the present disclosure and other features and attendant advantages will be readily apparent from the following detailed description of illustrative examples and modes for implementing the present disclosure when taken in conjunction with the accompanying drawings and the appended claims. In addition, the present disclosure expressly includes combinations and sub-combinations of elements and features set forth above and below.

[0021] With the aid of the sludge treatment system according to the present invention, equivalent ions, namely cations and anions, are generated by the ion generating unit, wherein a portion of the anions are adsorbed by the positive electrode and the hollow shaft of the electrolytic power source, and the cations continue to flow into the shell chamber and react with the sludge that is stirred and broken up by the branch pipes and blades, thereby degrading the sludge double layer, dehydrating the sludge, and discharging it after the water is filtered out through the filter.

[0022] With the aid of the sludge treatment system according to the present invention, the hollow shaft is connected to the positive pole of the electrolytic power supply, and the filter fixing member is connected to the negative pole of the electrolytic power supply, so that the sludge is placed in a stirring electric field, so that the direct current contacts the sludge body and accelerates the degradation of the sludge double layer.

[0023] With the aid of the sludge treatment system according to the present invention, since the sludge is organic matter, a thermal effect will be generated when a direct current flows through the sludge, thereby heating the sludge itself. Combined with the stirring and crushing of the branch pipes and blades, the heated sludge is fully exposed to the air, and then through the action of cationic ions, the decomposition is further accelerated to achieve a drying effect.

[0024] With the aid of the sludge treatment system according to the present invention, the sludge is broken up and heated up at the same time, which causes the odor in the housing chamber to increase, while the remaining anions have the effect of suppressing the odor and removing the taste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the double-layer structure formed by negatively charged residual sludge particles.

[0026] Figure 2 It is a schematic diagram of the negatively charged residual sludge particle system.

[0027] Figure 3 is a schematic diagram of a sludge treatment system according to an example of the present invention.

[0028] Figure 4 is a schematic perspective view of a hollow branch pipe of a sludge treatment system according to an example of the present invention.

[0029] Figure 5 is a schematic plan view of a hollow branch pipe of a sludge treatment system according to an example of the present invention.

[0030] Figure 6 is a schematic side cross-sectional view of a housing of a sludge treatment system according to an example of the present invention.

[0031] Figure 7 is a schematic side cross-sectional view of a housing of a sludge treatment system according to another example of the present invention.

[0032] Figure 8 FIG. 1 is a schematic diagram of an ion generating unit of a sludge treatment system according to an example of the present invention.

[0033] Fig. 9 is a schematic perspective view of a hollow shaft of a sludge treatment system according to one example of the present invention.

[0034] Fig.10 is a schematic perspective view of a hollow shaft of a sludge treatment system according to another example of the present invention.

[0035] Fig.11 yes Fig.10 A schematic diagram of blades on a hollow shaft is shown, with the hollow branches omitted to better illustrate the layout of the blades.

[0036] Fig.12 yes Fig.10 Schematic diagram of the hollow branches and blades on the hollow shaft shown, indicating the inclination angle of the blades.

[0037] Fig.13 is a schematic side cross-sectional view of another exemplary sludge treatment system according to the present invention, showing a double hollow shaft / double helix structure. DETAILED DESCRIPTION

[0038] Reference is made to the drawings, wherein like reference numerals refer to like elements. Figure 1 It is a schematic diagram of the double electric layer structure formed by the negatively charged residual sludge particles 301. Figure 2 Schematic diagram of a negatively charged excess sludge particle system. Since water is a polar molecule, it forms a double electric layer structure of an adsorption layer 302 and a diffusion layer 303 with the negatively charged excess sludge particles. The excess sludge system thus forms a highly dispersed double electric layer colloidal structure system of an adsorption layer 302 and a diffusion layer 303 with excess sludge particles 301 as the dispersed phase and water as the continuous phase. Figure 2The state of the residual sludge system with a moisture content between 94% and 97% after natural gravity sedimentation and concentration is shown, and its double electric layer moisture state is complete and free water is less. Due to the small residual sludge particles, the channel gap after bridging is small and complex, resulting in a large specific resistance to water, and the density of the residual sludge is close to that of water, and the physical sedimentation separation efficiency is low. In addition, the residual sludge has a high moisture content, and the residual sludge particles 301 and water form a stable structure of double electric layer colloids of adsorption layer 302 and diffusion layer 303 due to electrostatic attraction, which makes it difficult to dry the sludge. With the help of the sludge treatment system according to the present invention, on the one hand, the cations generated by the ion generating unit are led to the housing chamber, reacting with the sludge stirred and broken up by the branch pipe and the blades, thereby degrading the sludge double electric layer; on the other hand, the hollow shaft is connected to the positive electrode of the electrolytic power supply, and the filter screen fixing is connected to the negative electrode of the electrolytic power supply, so that the sludge is placed in a stirring electric field, so that the direct current contacts the sludge body, accelerating the degradation of the sludge double electric layer. It should be understood that, in the present invention, the term "sludge" covers any solid sediment material generated by the sewage treatment process, such as but not limited to waste from landfills, fertilizer plants, chemical plants, etc.

[0039] Figure 3 Schematic diagram of a sludge treatment system according to an example of the present invention. The sludge treatment system includes a housing 10, a hollow shaft 2, a filter screen fixing member 4 disposed on the lower portion of the housing 10, a filter screen 3 fixed to the lower portion of the housing 10 by the filter screen fixing member 4, an ion generating unit 7, a fan 8 and an electrolytic power supply. It should be understood that the sludge treatment system may include any other additional components as required, such as a sludge feeding barrel, etc., without departing from the scope of the present invention. Figure 3 In the example of FIG. 1 , the filter screen 3 is arranged below the filter screen fixing member 4 so that the filter screen fixing member 4 electrically connected to the negative electrode 5 of the electrolytic power source can better contact the sludge, so as to facilitate the degradation of the sludge double electrical layer. It should be understood that the filter screen 3 can also be arranged above the filter screen fixing member 4, such as Figure 6 and Figure 7 as shown, without departing from the scope of the present invention.

[0040] According to one example, the housing 10 defines a housing chamber 1, and the housing 10 extends around a horizontal central axis 109. The housing 10 is provided with a sludge inlet 101, a sludge outlet 103, an exhaust port 102, and a drain port 104. A sludge feed barrel can be provided on the sludge inlet 101 to better introduce the sludge.

[0041] According to one example, the hollow shaft 2 is arranged parallel to the horizontal central axis 109 and supported by the housing 10, the hollow shaft 2 includes a main shaft portion 210 arranged in the housing 10 and a protruding portion 211 extending out of the housing 10 at one end of the hollow shaft 2, the main shaft portion 210 includes a main shaft internal chamber 201 and a main shaft air outlet 209, the main shaft air outlet 209 is in fluid communication with the main shaft internal chamber 201 and extends through the side wall of the main shaft portion 210). Figure 6 and 7 In the example, the sludge treatment system includes a hollow shaft 2, and the hollow shaft 2 is arranged along the horizontal central axis 109. It should be understood that the sludge treatment system may include a plurality of hollow shafts 2 arranged side by side, such as Fig.13 shown.

[0042] According to one example, the ion generating unit 7 is disposed in the extension portion 211 of the hollow shaft 2 and is configured to generate ionized air entering the spindle internal chamber 201 to generate cations and anions. It should be understood that the ion generating unit 7 may also be disposed in the spindle portion 210 without departing from the scope of the present invention.

[0043] According to one example, the blower 8 is in fluid communication with the spindle inner chamber 201 and is disposed upstream of the ion generating unit 7 , and the blower 8 is configured to blow air of a predetermined flow rate into the spindle inner chamber 201 .

[0044] According to one example, the electrolytic power source includes a positive electrode 6 electrically connected to the hollow shaft 2 and a negative electrode 5 electrically connected to the filter fixing member 4. The positive electrode 6 and the negative electrode 5 are configured to generate an electric field between the hollow shaft 2 and the filter fixing member 4 to dry the sludge; the positive electrode 6 is configured to make the hollow shaft 2 positively charged, and a part of the anions generated by the ion generating unit 7 are adsorbed and neutralized by the positive charge on the hollow shaft 2; the cations generated by the ion generating unit 7 enter the sludge to facilitate the drying of the sludge. It should be understood that in the present invention, the electrolytic power source refers to a power source for generating an electric field between the hollow shaft 2 and the filter fixing member 4. Other electrical components of the sludge treatment system, such as the ion generating unit 7, the fan 8, the driving device of the hollow shaft 2, etc., may also include a power source.

[0045] According to one example, the hollow shaft 2 can rotate around the horizontal central axis 109. The sludge treatment system also includes a plurality of hollow branches 202 arranged around the main shaft portion 210 of the hollow shaft 2. The hollow branches 202 can be fixed to the hollow shaft 2 in any suitable manner, such as but not limited to welding, etc. It should be understood that the hollow branches 202 can also be formed integrally with the hollow shaft 2 without departing from the scope of the present invention. It should also be understood that the sludge treatment system may also not include the hollow branches 202, but include blades arranged around the main shaft portion 210 of the hollow shaft 2 for stirring the sludge.

[0046] Figure 4 is a schematic perspective view of a hollow branch pipe 202 of a sludge treatment system according to an example of the present invention. Figure 5 FIG. 2 is a schematic plan view of a hollow branch pipe 202 of a sludge treatment system according to an example of the present invention. Figure 4 As shown in , the hollow branch pipe 202 includes a hollow branch pipe inlet 206 disposed at a first end of the hollow branch pipe 202, an end face air outlet 204 disposed at an opposite second end of the hollow branch pipe 202, a hollow branch pipe internal chamber 207 extending between the branch pipe inlet 206 and the end face air outlet 204, and a plurality of branch pipe holes 203 disposed on the side wall of the hollow branch pipe 202 and in fluid communication with the branch pipe internal chamber 207. The branch pipe inlet 206 coincides with the spindle air outlet 209, so that the branch pipe internal chamber 207 is in fluid communication with the spindle internal chamber 201 via the branch pipe inlet 206 and the spindle air outlet 209.

[0047] According to one example, the hollow branch pipe 202 further includes blades 205 disposed on the outer surface of the hollow branch pipe 202. Figure 4 As shown, the blades 205 extend along the axis of the hollow branch pipe 202 .

[0048] like Figure 3 As shown in the figure, the plurality of hollow branches 202 are arranged in a plurality of rows along the main shaft portion 210 of the hollow shaft 2, and each row includes a group of hollow branches 202 spaced apart around the corresponding outer circumference 212 of the main shaft portion 210 of the hollow shaft 2. The hollow branches 202 may be equally spaced apart around the corresponding outer circumference 212 of the main shaft portion 210 of the hollow shaft 2. It should be understood that the hollow branches 202 may also be spaced apart at different distances around the corresponding outer circumference 212 of the main shaft portion 210 of the hollow shaft 2 without departing from the scope of the present invention. Fig. 9 FIG. 2 is a schematic perspective view of a hollow shaft 2 of a sludge treatment system according to an example of the present invention. Fig. 9 The hollow branch pipe 202 and the blade 205 are removed. It should be understood that since the branch pipe inlet 206 of the hollow branch pipe 202 coincides with the main shaft air outlet 209 of the hollow shaft 2, Fig. 9 In the embodiment, the position of the hollow branch pipe 202 corresponds to the main shaft air outlet 209 of the hollow shaft 2. According to an example, Figure 5 As shown, each blade 205 is arranged at an angle between 20 degrees and 60 degrees relative to a plane 206 perpendicular to the hollow shaft 2. Preferably, each blade 205 is arranged at an angle of 45 degrees relative to a plane 206 perpendicular to the hollow shaft 2. It should be understood that the blade 205 can be arranged at any other suitable angle relative to the plane 206 perpendicular to the hollow shaft 2 without departing from the scope of the present invention. In addition, the angle of each blade 205 relative to the plane 206 can be the same or different without departing from the scope of the present invention.

[0049] According to one example, the blades 205 extend obliquely with respect to the axis of the hollow branch tubes 202. The plurality of hollow branch tubes 202 are arranged on the outer surface of the main shaft portion 210 of the hollow shaft 2 at intervals in a spiral path. Fig.10 FIG. 2 is a schematic perspective view of a hollow shaft 2 of a sludge treatment system according to another example of the present invention. Fig.10 The hollow branch pipe 202 and the blade 205 are removed. It should be understood that since the branch pipe inlet 206 of the hollow branch pipe 202 coincides with the main shaft air outlet 209 of the hollow shaft 2, Fig.10 In the figure, the position of the hollow branch pipe 202 corresponds to the main shaft air outlet 209 of the hollow shaft 2.

[0050] Fig.11 yes Fig.10 A schematic diagram of a blade 205 on a hollow shaft 2 is shown, wherein the hollow branch pipe 202 is omitted to better illustrate the layout of the blade 205. Since the blade 205 extends obliquely relative to the axis of the hollow branch pipe 202, the blade 205 is twisted at a certain angle β relative to the axis of the hollow shaft 2 (i.e., the horizontal center axis 109). Fig.12 yes Fig.10 Schematic diagram of a hollow branch 202 and a blade 205 on a hollow shaft, showing the twist / tilt angle β of the blade. Fig.11 As shown in , the blade 205 includes a first blade 2051, a second blade 2052 and a third blade 2053. The circumferential distance between two adjacent blades 205 is α. That is, the circumferential distance between the first blade 2051 and the second blade 2052 is α, and the circumferential distance between the second blade 2052 and the third blade 2053 is α. Fig.12As shown, tanβ is equal to the circumferential distance α between adjacent hollow branches 202 / the axial distance d2 between adjacent hollow branches 202. It should be understood that the circumferential distance α between adjacent blades 205 may be different, and the axial distance d2 between adjacent blades 205 may also be different, as long as tanβ is equal to the circumferential distance α between adjacent hollow branches 202 / the axial distance d2 between adjacent hollow branches 202.

[0051] Figure 6 1 is a schematic side cross-sectional view of a housing 10 of a sludge treatment system according to an example of the present invention. The housing 10 is cylindrical and includes a cylindrical side wall 113 extending around a horizontal central axis 109, a first circular end plate (not shown) close to the ion generating unit 7, and a second circular end plate (not shown) away from the ion generating unit 7. The sludge inlet 101 is arranged at the top of the cylindrical side wall 113 of the housing 10, the sludge outlet 103 is arranged at the bottom of the second circular end plate of the housing 10, the exhaust port 102 is arranged at the top of the cylindrical side wall 113 of the housing 10, and the drain port 104 is arranged at the bottom of the cylindrical side wall 113 of the housing 10. The filter screen fixing member 4 and the filter screen 3 cover part or all of the lower half of the cylindrical side wall 113 of the housing 10.

[0052] Figure 7 1 is a schematic side cross-sectional view of a housing 10 of a sludge treatment system according to another example of the present invention. The housing 10 is composed of a lower portion of a semicircular cross section and an upper portion of a rectangular cross section, and includes a lower semi-cylindrical side wall 110 extending around a horizontal central axis 109, a pair of upper side walls 111 extending vertically upward from the top end of the lower semi-cylindrical side wall, a top plate 112 extending between the pair of upper side walls 111, a first end plate (not shown) close to the ion generating unit 7, and a second end plate (not shown) away from the ion generating unit 7. The sludge inlet 101 is arranged at the top plate 112 of the housing 10, the sludge outlet 103 is arranged at the bottom of the second end plate of the housing 10, the exhaust port 102 is arranged at the top plate 112 of the housing 10, and the drain port 104 is arranged at the bottom of the lower semi-cylindrical side wall 110 of the housing 10. The filter screen fixing member 4 and the filter screen 3 cover a part or all of the lower semi-cylindrical side wall 110 of the housing 10. Fig.13is a schematic side cross-sectional view of a sludge treatment system according to another example of the present invention, showing a double hollow shaft / double helix structure. The shell 10 has a rectangular cross-section, including a bottom plate 114, a pair of upper side walls 111 extending vertically upward from the bottom plate 114, a top plate 112 extending between the pair of upper side walls 111, a first end plate close to the ion generating unit 7 and a second end plate away from the ion generating unit 7, a sludge inlet 101 is arranged at the top plate 112 of the shell 10 close to the first end plate, a sludge outlet 103 is arranged at the bottom of the second end plate of the shell 10, an exhaust port 102 is arranged at the top plate 112 of the shell 10, and a drain port 104 is arranged at the bottom plate 114 of the shell 10. Two hollow shafts 2 are arranged side by side in the shell 10. The filter screen fixing member 4 and the filter screen 3 cover at least the bottom plate 114 of the shell 10. It should be understood that the sludge treatment system may include more than two hollow shafts 2 without departing from the scope of the present invention. It should also be understood that, Figure 6 , Figure 7 , Fig.13 The cross-sectional shape of the housing 10 shown is only an example, and those skilled in the art may adopt any other suitable cross-sectional shape of the housing 10 as required, for example, Fig.13 The bottom plate 114 in the embodiment may be configured as a double semicircle or other shape without departing from the scope of the present invention.

[0053] According to one example, the filter screen fixing member 4 and the filter screen 3 are arranged at the lower part of the housing 10. The filter screen fixing member 4 and the filter screen 3 may cover the entire lower part of the housing 10, or may cover a part of the lower part of the housing 10, such as Figure 6 and 7 As shown. The mesh size of the filter screen 3 is set so that water can pass through, but sludge cannot pass through. The filter screen holder 4 also takes the form of a screen and extends to the same range as the filter screen 3 so as to better support the filter screen 3. The mesh size of the filter screen holder 4 is significantly larger than the mesh size of the filter screen 3 so as to reduce the resistance of the water flow. According to one example, the filter screen holder 4 is made of metal and is mounted to the housing 10 via an insulating frame. According to another example, the filter screen holder 4 is made of metal and an insulating member is provided on the outer surface.

[0054] Figure 8Schematic diagram of an ion generating unit of a sludge treatment system according to an example of the present invention. The ion generating unit 7 includes a high-voltage positive electrode ring 701 and a high-voltage negative electrode ring 702. The spacing d between the high-voltage positive electrode ring 701 and the high-voltage negative electrode ring 702 can be selected as needed. When high voltage is applied to the high-voltage positive electrode ring 701 and the high-voltage negative electrode ring 702, air molecules will be ionized to generate positive ions and negative ions. If the spacing d is too close, the high-voltage positive electrode ring 701 and the high-voltage negative electrode ring 702 will break through the air to generate an arc, affecting the formation of ions; if the spacing d is too far, the ionization effect will be reduced, and the efficiency of generating ions will be greatly reduced.

[0055] The present invention also provides a sludge treatment method for drying sludge using a sludge treatment system, comprising: introducing the sludge to be dried into the shell chamber 1 through the sludge inlet 101; connecting the electrolytic power supply, starting the ion generating unit 7 and the fan 8, and driving the hollow shaft 2 to rotate, so that the ion generating unit 7 generates cations and anions, the hollow shaft 2 is positively charged, and a part of the anions generated by the ion generating unit 7 is adsorbed and neutralized by the positive charge on the hollow shaft 2; the cations generated by the ion generating unit 7 enter the sludge to facilitate drying the sludge; and after the sludge drying is completed, the dried sludge is discharged through the sludge outlet 103.

[0056] In addition, the driving device of the hollow shaft 2 can be started to rotate the hollow shaft 2, driving the hollow branch pipe 202 and the blades 205 to rotate, which has the effects of stirring, breaking up, electrifying and pushing the sludge, and also allows the negative ions and cations in the sludge to fully contact and react, so as to promote sludge agglomeration, remove heavy metals, reduce the stability of colloidal particles, and improve the dehydration effect.

[0057] With the aid of the sludge treatment system according to the present invention, equivalent ions, i.e., cations and anions, are generated by the ion generating unit, wherein a portion of the anions are adsorbed by the positive electrode and the hollow shaft of the electrolytic power source, and the cations continue to flow into the shell chamber 1 and react with the sludge that is stirred and broken up by the blades 205, thereby degrading the sludge double layer, dehydrating the sludge, and discharging it after the water is filtered out by the filter 3.

[0058] With the aid of the sludge treatment system according to the present invention, the hollow shaft 2 is connected to the positive electrode 6 of the electrolytic power supply, and the filter fixing member 4 is connected to the negative electrode 5 of the electrolytic power supply, so that the sludge is placed in a stirring electric field, so that the direct current contacts the sludge body, accelerating the degradation of the sludge double layer.

[0059] With the aid of the sludge treatment system according to the present invention, since the sludge is organic matter, a thermal effect will be generated when a direct current flows through the sludge, thereby heating the sludge itself. Combined with the stirring and crushing of the branch pipe 202 and the blades 205, the heated sludge is fully exposed to the air, and then through the action of cationic ions, the decomposition is further accelerated to achieve a drying effect.

[0060] To sum up, without adding chemical agents, the cations generated by the ion generating unit are used to contact and react fully with the negative charges, organic matter, heavy metals, etc. in the sludge, thereby removing heavy metals and dehydrating efficiently. A part of the anions generated reacts with toxic gases to remove harmful gases, so that the finished sludge can achieve the effects of drying, dehydration, non-toxicity and odorlessness.

[0061] The described embodiments of the present disclosure are intended to be used as non-limiting examples, and other embodiments may take various and alternative forms. In addition, the drawings are not necessarily to scale, and may present some simplified expressions of various features of the present disclosure, including, for example, specific dimensions, directions, positions, and shapes. The details associated with such features will be determined in part by the intended application and use environment of the described embodiments.

[0062] For the purposes of this description, unless expressly denied, the use of the singular includes the plural, and vice versa, the terms "and" and "or" shall be both conjunctions and transitional conjunctions, and the words "include", "comprise", "have", etc. shall mean "including but not limited to". In addition, approximate words, such as "about", "almost", "substantially", "roughly", "approximately", etc., may be used herein in the sense of "at, close to, or nearly at", or "within 0-5% of..." or "within acceptable manufacturing tolerances" or any logical combination thereof. As used herein, a component "configured to" perform a specified function is capable of performing the specified function without change, not merely having the potential to perform the specified function after further modification. In other words, the hardware described, when explicitly configured to perform the specified function, is specifically selected, created, implemented, utilized, programmed and / or designed for the purpose of performing the specified function. In addition, the use of ordinal words such as first, second, and third does not necessarily imply a sequential meaning of ranking, but may simply be used to distinguish between multiple instances of an action or structure.

[0063] The detailed description and the accompanying drawings or figures are support and description of the present teaching, but the scope of the present teaching is limited only by the claims. Although the best mode and some of the other embodiments for implementing the present teaching have been described in detail, there are various alternative designs and embodiments for practicing the present teaching defined in the appended claims. In addition, the present disclosure explicitly includes the combinations and sub-combinations of the elements and features set forth above and below.

Claims

1. A sludge treatment system, comprising: A shell (10), the shell (10) defining a shell chamber (1), the shell (10) extending around a horizontal central axis (109), the shell (10) being provided with a sludge inlet (101), a sludge outlet (103), an exhaust port (102), and a drain port (104); A hollow shaft (2), the hollow shaft (2) being arranged parallel to the horizontal central axis (109) and supported by the housing (10), the hollow shaft (2) comprising a main shaft portion (210) arranged in the housing (10) and a protruding portion (211) extending out of the housing (10) at one end of the hollow shaft (2), the main shaft portion (210) comprising a main shaft internal chamber (201) and a main shaft air outlet (209), the main shaft air outlet (209) being in fluid communication with the main shaft internal chamber (201) and extending through a side wall of the main shaft portion (210); A filter fixing member (4) disposed on the lower portion of the housing (10); A filter (3) fixed to the lower portion of the housing (10) by a filter fixing member (4); an ion generating unit (7), the ion generating unit (7) being disposed in the protruding portion (211) of the hollow shaft (2) and configured to generate ionized air entering the inner chamber (201) of the main shaft to generate cations and anions; A fan (8), the fan (8) being in fluid communication with the spindle internal chamber (201) and being disposed upstream of the ion generating unit (7), the fan (8) being configured to blow air at a predetermined flow rate into the spindle internal chamber (201); as well as An electrolytic power source, the electrolytic power source comprising a positive electrode (6) electrically connected to the hollow shaft (2) and a negative electrode (5) electrically connected to the filter fixing member (4); The positive electrode (6) and the negative electrode (5) are configured to generate an electric field between the hollow shaft (2) and the filter screen fixing member (4) to dry the sludge; the positive electrode (6) is configured to make the hollow shaft (2) positively charged, and a part of the anions generated by the ion generating unit (7) are adsorbed and neutralized by the positive charges on the hollow shaft (2); The cations generated by the ion generating unit (7) enter the sludge to facilitate drying of the sludge.

2. The sludge treatment system according to claim 1, wherein: The hollow shaft (2) is rotatable around a horizontal central axis (109), and the sludge treatment system further comprises a plurality of hollow branch pipes (202) arranged around a main shaft portion (210) of the hollow shaft (2), wherein the hollow branch pipe (202) comprises a hollow branch pipe inlet (206) arranged at a first end of the hollow branch pipe (202), an end face air outlet (204) arranged at an opposite second end of the hollow branch pipe (202), a hollow branch pipe internal chamber (207) extending between the branch pipe inlet (206) and the end face air outlet (204), and a plurality of branch pipe holes (203) arranged on a side wall of the hollow branch pipe (202) and in fluid communication with the branch pipe internal chamber (207), wherein the branch pipe internal chamber (207) is in fluid communication with the main shaft internal chamber (201) via the branch pipe inlet (206) and the main shaft air outlet (209).

3. The sludge treatment system according to claim 2, wherein: The hollow branch pipe (202) further includes blades (205) disposed on the outer surface of the hollow branch pipe (202).

4. The sludge treatment system according to claim 3, wherein: The blades (205) extend along the axis of the hollow branch pipe (202).

5. The sludge treatment system according to claim 4, wherein: The plurality of hollow branches (202) are arranged in a plurality of rows along the main shaft portion (210) of the hollow shaft (2), each row comprising a group of hollow branches (202) spaced apart around a corresponding outer circumference (212) of the main shaft portion (210) of the hollow shaft (2).

6. The sludge treatment system according to claim 3, wherein: The blades (205) extend obliquely relative to the axis of the hollow branch pipe (202).

7. The sludge treatment system according to claim 6, wherein: The plurality of hollow branch tubes (202) are arranged at intervals in a spiral path on the outer surface of the main shaft portion (210) of the hollow shaft (2).

8. The sludge treatment system according to claim 1, wherein: The ion generating unit (7) comprises a high-voltage positive electrode ring (701) and a high-voltage negative electrode ring (702).

9. The sludge treatment system according to claim 1, wherein: The shell (10) is cylindrical and comprises a cylindrical side wall (113) extending around a horizontal central axis (109), a first circular end plate close to the ion generating unit (7), and a second circular end plate away from the ion generating unit (7); a sludge inlet (101) is arranged at the top of the cylindrical side wall (113) of the shell (10) and close to the first circular end plate; a sludge outlet (103) is arranged at the bottom of the second circular end plate of the shell (10); an exhaust port (102) is arranged at the top of the cylindrical side wall (113) of the shell (10); and a drain port (104) is arranged at the bottom of the cylindrical side wall (113) of the shell (10).

10. The sludge treatment system according to claim 1, wherein: The shell (10) is composed of a lower part with a semicircular cross-section and an upper part with a rectangular cross-section, and includes a lower semi-cylindrical side wall (110) extending around a horizontal central axis (109), a pair of upper side walls (111) extending vertically upward from the top end of the lower semi-cylindrical side wall, a top plate (112) extending between the pair of upper side walls (111), a first end plate close to the ion generating unit (7) and a second end plate away from the ion generating unit (7), a sludge inlet (101) is arranged at the top plate (112) of the shell (10) close to the first end plate, a sludge outlet (103) is arranged at the bottom of the second end plate of the shell (10), an exhaust port (102) is arranged at the top plate (112) of the shell (10), and a drain port (104) is arranged at the bottom of the lower semi-cylindrical side wall (110) of the shell (10).

11. The sludge treatment system according to claim 1, wherein: The shell (10) has a rectangular cross-section, and comprises a bottom plate (114), a pair of upper side walls (111) extending vertically upward from the bottom plate (114), a top plate (112) extending between the pair of upper side walls (111), a first end plate close to the ion generating unit (7), and a second end plate far from the ion generating unit (7); a sludge inlet (101) is arranged at the top plate (112) of the shell (10) close to the first end plate; a sludge outlet (103) is arranged at the bottom of the second end plate of the shell (10); an exhaust port (102) is arranged at the top plate (112) of the shell (10); a drain port (104) is arranged at the bottom plate (114) of the shell (10); and at least two hollow shafts (2) are arranged side by side in the shell (10).

12. The sludge treatment system according to claim 1, wherein: The filter screen fixing member (4) is made of metal and is mounted to the housing (10) via an insulating frame.

13. The sludge treatment system according to claim 1, wherein: The filter screen fixing part (4) is made of metal and has an insulating part arranged on its outer surface.

14. The sludge treatment system according to claim 1, wherein: The filter screen (3) is arranged below the filter screen fixing part (4) so ​​that the filter screen fixing part (4) electrically connected to the negative electrode (5) of the electrolytic power source can better contact with the sludge, thereby facilitating the degradation of the sludge double electrical layer.

15. The sludge treatment system according to claim 1, wherein: The filter screen (3) is arranged above the filter screen fixing member (4).

16. A sludge treatment method for drying sludge using the sludge treatment system according to any one of claims 1 to 15, comprising: Introducing the sludge to be dried into the housing chamber (1) via the sludge inlet (101); The electrolysis power supply is turned on, and the ion generating unit (7) and the blower (8) are started, so that the ion generating unit (7) generates cations and anions, the hollow shaft (2) is positively charged, and a part of the anions generated by the ion generating unit (7) is adsorbed and neutralized by the positive charge on the hollow shaft (2); The cations generated by the ion generating unit (7) enter the sludge to facilitate drying of the sludge; as well as After the sludge is dried, the dried sludge is discharged through the sludge outlet (103).

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