Apparatus and method for ion separation deodorization

Abstract

This invention relates to a sludge treatment system, comprising: a housing (10) defining a housing chamber (1) 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); a filter screen holder (4) disposed on a lower portion of the housing (10); a filter screen (3) fixed to the lower portion of the housing (10) by the filter screen holder (4); an ion generating unit (7); a blower (8) disposed upstream of the ion generating unit (7); and an electrolysis power source including a positive electrode (6) electrically connected to the hollow shaft (2) and a negative electrode (5) electrically connected to the filter screen holder (4). The invention also relates to a sludge treatment method.

Description

Technical Field

[0001] This disclosure relates to apparatus and methods for ion deodorization, and more specifically to sludge treatment systems and methods. Background Technology

[0002] The activated sludge treatment method for municipal wastewater uses activated sludge to adsorb pollutants in the wastewater, thus purifying it. The pollutants are degraded through the physiological metabolism of the activated sludge microorganisms. To maintain the operational balance of the wastewater treatment system, some activated sludge needs to be discharged; this discharged activated sludge is called excess sludge.

[0003] The particle size of the residual sludge is around 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, and protozoa, as well as their own oxidation residues and adsorbed recalcitrant organic and inorganic substances.

[0004] More than 50% of the dry weight of microorganisms is protein. Proteins can dissociate into cations and anions in water, with an isoelectric point of pH 2-5. At this pH, the degree of cation and anion dissociation is equal, and the microorganisms are electrically neutral. If the system pH is higher than the isoelectric point, the microorganisms will transfer protons and become negatively charged. Activated sludge in wastewater treatment can only metabolize and survive normally in a neutral or slightly alkaline environment. Since the system pH is higher than the microorganism's isoelectric point, the microorganisms carry a negative charge. The charge of the microorganisms determines the charge of the residual sludge, so the residual sludge also carries a negative charge.

[0005] Meanwhile, due to the large specific surface area of ​​the residual sludge, it has high adsorption capacity. Non-metallic oxides and negatively charged large ionic inorganic substances such as nitrogen, sulfur, phosphorus and silicon oxyanions in 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 method that can effectively handle excess sludge. Summary of the Invention

[0007] In one aspect, the present invention provides a sludge treatment system, comprising: The shell defines a shell chamber, the shell extends about a horizontal central axis, and the shell is provided with a sludge inlet, a sludge outlet, an exhaust port, and a drain port; A hollow shaft is arranged parallel to the horizontal central axis and supported by the housing. The hollow shaft includes a main shaft portion disposed within the housing and an extension portion extending from one end of the hollow shaft to the outside of the housing. The main shaft portion includes an internal chamber and an air outlet. The air outlet is in fluid communication with the internal chamber and extends through the side wall of the main shaft portion. A filter screen holder is installed on the lower part of the housing; The filter screen is fixed to the lower part of the housing by a filter screen fastener; An ion generating unit is disposed within the extended portion of the hollow shaft and configured to generate ionized air that enters the internal chamber of the main shaft to produce cations and anions. A fan, which is in fluid communication with the internal chamber of the main shaft and is located upstream of the ion generating unit, is configured to blow air at a predetermined flow rate into the internal chamber of the main shaft; and An electrolytic power source, the electrolytic power source comprising a positive electrode electrically connected to a hollow shaft and a negative electrode electrically connected to a filter screen fixing component; The positive and negative electrodes are configured to generate an electric field between the hollow shaft and the filter screen fixing component to dry the sludge; the positive electrode is configured to make the hollow shaft positively charged, and some 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 about a horizontal central axis, and the sludge treatment system further includes a plurality of hollow branch pipes arranged around the main shaft portion of the hollow shaft. The hollow branch pipe includes a hollow branch pipe inlet at a first end of the hollow branch pipe, an end face air outlet at a relative second end of the hollow branch pipe, a hollow branch pipe internal cavity extending between the branch pipe inlet and the end face air outlet, and a plurality of branch pipe holes arranged on the side wall of the hollow branch pipe and in fluid communication with the branch pipe internal cavity. The branch pipe internal cavity is in fluid communication with the main shaft internal cavity via the branch pipe inlet and the main shaft air outlet.

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

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

[0011] In one example, the plurality of hollow branch pipes are arranged in multiple rows along the main axis portion of the hollow shaft, each row comprising a set of hollow branch pipes spaced apart from the corresponding outer circumference of the main axis portion of the hollow shaft.

[0012] In one example, the blade extends at an angle relative to the axis of the hollow branch pipe.

[0013] In one example, the plurality of hollow branches are arranged at intervals 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 housing is cylindrical and includes a cylindrical sidewall extending around a horizontal central axis, a first circular end plate near the ion generating unit, and a second circular end plate away from the ion generating unit. The sludge inlet is located at the top of the cylindrical sidewall of the housing, the sludge outlet is located at the bottom of the second circular end plate of the housing, the vent is located at the top of the cylindrical sidewall of the housing, and the drain outlet is located at the bottom of the cylindrical sidewall of the housing.

[0016] In one example, the shell is composed of a lower portion with a semi-circular cross-section and an upper portion with a rectangular cross-section, including a lower semi-cylindrical sidewall extending around a horizontal central axis, a pair of upper sidewalls extending vertically upward from the top of the lower semi-cylindrical sidewall, a top plate extending between the pair of upper sidewalls, a first end plate near the ion generating unit, and a second end plate away from the ion generating unit. A sludge inlet is located at the top plate of the shell, a sludge outlet is located at the bottom of the second end plate of the shell, an exhaust port is located at the top plate of the shell, and a drain outlet is located at the bottom of the lower semi-cylindrical sidewall 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 holder is made of metal and has an insulating component on its outer surface.

[0019] In another aspect, the present invention provides a sludge treatment method for drying sludge using the sludge treatment system described above, comprising: The sludge to be dried is introduced into the shell chamber through the sludge inlet; The electrolysis power supply is connected, and the ion generating unit and blower are started. This causes the ion generating unit to produce cations and anions. The hollow shaft carries a positive charge. Some of the anions produced by the ion generating unit are adsorbed and neutralized by the positive charge on the hollow shaft. The cations produced by the ion generating unit enter the sludge to facilitate sludge drying. After the sludge drying is completed, the dried sludge is discharged through the sludge outlet.

[0020] The foregoing features and advantages of this disclosure, as well as other features and incidental advantages, will readily become apparent from the following detailed description of illustrative examples and models for carrying out this disclosure, when taken in conjunction with the accompanying drawings and appended claims. Furthermore, this disclosure expressly includes combinations and sub-combinations of the elements and features set forth above and below.

[0021] With the aid of the sludge treatment system according to the present invention, an ion generating unit generates equivalent ions, namely cations and anions. A portion of the anions are adsorbed by the positive electrode of the electrolytic power source and the hollow shaft, while the cations continue to enter the shell chamber and react with the sludge that has been agitated and dispersed by the branch pipes and blades, thereby degrading the sludge double layer, dewatering the sludge, and discharging it after the water is removed by the filter screen.

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

[0023] With the help of the sludge treatment system according to the present invention, since the sludge is an organic material, the direct current flowing through the sludge will generate a thermal effect, thereby raising the temperature of 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 further accelerated by the action of cations to achieve the drying effect.

[0024] With the help of the sludge treatment system according to the present invention, the odor in the shell chamber is aggravated due to the sludge being broken up and heated at the same time, while the remaining anions have the effect of suppressing odor and deodorizing. Attached Figure Description

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

[0026] Figure 2 This is a schematic diagram of a negatively charged residual sludge granular system.

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

[0028] Figure 4 This 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 This 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 This is a schematic side cross-sectional view of the housing of a sludge treatment system according to an example of the present invention.

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

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

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

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

[0035] Figure 11 yes Figure 10 The diagram shows the blades on the hollow shaft, with the hollow branch pipe omitted to better illustrate the blade layout.

[0036] Figure 12 yes Figure 10 The diagram shows the hollow branch pipe and blades on the hollow shaft, and the tilt angle of the blades is shown.

[0037] Figure 13 This is a schematic side cross-sectional view of a sludge treatment system according to another example of the invention, showing a double hollow shaft / double helix structure. Detailed Implementation

[0038] Referring to the accompanying drawings, similar reference numerals denote similar elements. Figure 1 This is a schematic diagram of the double-layer structure formed by the negatively charged residual sludge particles 301. Figure 2 This is a schematic diagram of a negatively charged residual sludge particle system. Since water is a polar molecule, it forms an electric double layer structure with the negatively charged residual sludge particles, consisting of an adsorption layer 302 and a diffusion layer 303. The residual sludge system thus forms a highly dispersed colloidal structure system with residual sludge particles 301 as the dispersed phase and water as the continuous phase, consisting of an adsorption layer 302 and a diffusion layer 303. Figure 2The diagram illustrates the state of a residual sludge system with a moisture content between 94% and 97% after natural gravity sedimentation and concentration. Its double electric layer is intact with minimal free water. Due to the small size of the residual sludge particles and the small and complex gaps in the bridging channels, the water flow resistance is high, and the density of the residual sludge is close to that of water, resulting in low physical sedimentation separation efficiency. Furthermore, the high moisture content of the residual sludge leads to a stable double electric layer colloidal structure (adsorption layer 302 and diffusion layer 303) formed between the residual sludge particles 301 and water due to electrostatic attraction, making sludge drying difficult. Using the sludge treatment system according to the invention, on one hand, cations generated by the ion generating unit enter the shell chamber and react with the sludge agitated and dispersed by the branch pipes and blades, thereby degrading the sludge double electric layer; on the other hand, the hollow shaft is connected to the positive terminal of the electrolysis power supply, and the filter screen fixing member is connected to the negative terminal, placing the sludge in the stirring electric field, thereby allowing direct current to contact the sludge body and accelerating the degradation of the sludge double electric layer. It should be understood that, in this invention, the term "sludge" encompasses any solid sediment generated during wastewater treatment processes, such as, but not limited to, waste from landfills, fertilizer plants, chemical plants, etc.

[0039] Figure 3 This is a 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 holder 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 holder 4, an ion generating unit 7, a blower 8, and an electrolysis power supply. It should be understood that the sludge treatment system may include any other additional components, such as a sludge feed cylinder, as needed, without departing from the scope of the invention. Figure 3 In the example, filter screen 3 is positioned below filter screen holder 4 so that filter screen holder 4, which is electrically connected to the negative terminal 5 of the electrolysis power supply, can better contact the sludge, thereby facilitating the degradation of the sludge's double electric layer. It should be understood that filter screen 3 can also be positioned above filter screen holder 4, such as... Figure 6 and Figure 7 As shown, without departing from the scope of the invention.

[0040] According to one example, the housing 10 defines a housing chamber 1, and the housing 10 extends about 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 cylinder may be provided on the sludge inlet 101 for better sludge introduction.

[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 disposed within the housing 10 and an extension portion 211 extending from one end of the hollow shaft 2 beyond the housing 10. The main shaft portion 210 includes an internal main shaft chamber 201 and a main shaft outlet 209, the main shaft outlet 209 being in fluid communication with the internal main shaft chamber 201 and extending through the sidewall 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 multiple hollow shafts 2 arranged side-by-side, such as... Figure 13 As shown.

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

[0043] According to one example, the fan 8 is in fluid communication with the spindle internal chamber 201 and is located upstream of the ion generating unit 7, and the fan 8 is configured to blow air at a predetermined flow rate into the spindle internal 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 screen 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 give the hollow shaft 2 a positive charge, and a portion 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 sludge drying. It should be understood that, in this invention, the electrolytic power source refers to a power source used to generate an electric field between the hollow shaft 2 and the filter screen fixing member 4. Other electrical components of the sludge treatment system, such as the ion generating unit 7, the blower 8, the drive device of the hollow shaft 2, etc., may also include a power source.

[0045] According to one example, the hollow shaft 2 is rotatable about a horizontal central axis 109. The sludge treatment system also includes a plurality of hollow branch pipes 202 disposed around the main shaft portion 210 of the hollow shaft 2. The hollow branch pipes 202 can be fixed to the hollow shaft 2 by any suitable means, such as, but not limited to, welding. It should be understood that the hollow branch pipes 202 can also be integrally formed with the hollow shaft 2 without departing from the scope of the invention. It should also be understood that the sludge treatment system may also exclude the hollow branch pipes 202 and include blades disposed around the main shaft portion 210 of the hollow shaft 2 for agitating the sludge.

[0046] Figure 4 This 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 This is a schematic plan view of the hollow branch pipe 202 of a sludge treatment system according to an example of the present invention. Figure 4 As shown, 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 a 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 main shaft air outlet 209, thereby 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.

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

[0048] like Figure 3 As shown, the plurality of hollow branch pipes 202 are arranged in multiple rows along the main axis portion 210 of the hollow shaft 2, each row comprising a group of hollow branch pipes 202 spaced apart around the corresponding outer circumference 212 of the main axis portion 210 of the hollow shaft 2. The hollow branch pipes 202 may be equidistantly spaced around the corresponding outer circumference 212 of the main axis portion 210 of the hollow shaft 2. It should be understood that the hollow branch pipes 202 may also be spaced apart at different distances around the corresponding outer circumference 212 of the main axis portion 210 of the hollow shaft 2 without departing from the scope of the invention. Figure 9 This is a schematic perspective view of the hollow shaft 2 of an example sludge treatment system according to the present invention. For clarity, in Figure 9 The hollow branch pipe 202 and blade 205 were removed. It should be understood that, since the branch pipe inlet 206 of the hollow branch pipe 202 coincides with the main shaft outlet 209 of the hollow shaft 2, therefore, in Figure 9 In the middle, 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, such as Figure 5 As shown, each blade 205 is arranged at an angle between 20 and 60 degrees relative to a plane 206 perpendicular to the hollow axis 2. Preferably, each blade 205 is arranged at an angle of 45 degrees relative to the plane 206 perpendicular to the hollow axis 2. It should be understood that the blades 205 can be arranged at any other suitable angle relative to the plane 206 perpendicular to the hollow axis 2 without departing from the scope of the invention. Furthermore, the angles of each blade 205 relative to the plane 206 can be the same or different without departing from the scope of the invention.

[0049] According to one example, the blade 205 extends obliquely relative to the axis of the hollow branch pipe 202. The plurality of hollow branch pipes 202 are arranged at intervals in a helical path on the outer surface of the main shaft portion 210 of the hollow shaft 2. Figure 10 This is a schematic perspective view of the hollow shaft 2 of a sludge treatment system according to another example of the present invention. For clarity, in Figure 10 The hollow branch pipe 202 and blade 205 were removed. It should be understood that, since the branch pipe inlet 206 of the hollow branch pipe 202 coincides with the main shaft outlet 209 of the hollow shaft 2, therefore, in Figure 10 In the middle, the position of the hollow branch pipe 202 corresponds to the main shaft air outlet 209 of the hollow shaft 2.

[0050] Figure 11 yes Figure 10 The schematic diagram shows the blades 205 on the hollow shaft 2, where the hollow branch pipe 202 is omitted to better illustrate the layout of the blades 205. Since the blades 205 extend obliquely relative to the axis of the hollow branch pipe 202, the blades 205 are twisted by a certain angle β relative to the axis of the hollow shaft 2 (that is, the horizontal central axis 109). Figure 12 yes Figure 10 The schematic diagram shows the hollow branch 202 and blade 205 on the hollow shaft, illustrating the blade's twist / tilt angle β. Figure 11 As shown, blade 205 includes a first blade 2051, a second blade 2052, and a third blade 2053. The circumferential distance between any 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. Figure 12As shown, tanβ is equal to the circumferential distance α between adjacent hollow branch pipes 202 / the axial distance d2 between adjacent hollow branch pipes 202. It should be understood that the circumferential distance α between adjacent blades 205 can be different, and the axial distance d2 between adjacent blades 205 can also be different, as long as tanβ is equal to the circumferential distance α between adjacent hollow branch pipes 202 / the axial distance d2 between adjacent hollow branch pipes 202.

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

[0052] Figure 7 This is a schematic side cross-sectional view of the housing 10 of a sludge treatment system according to another example of the present invention. The housing 10 is composed of a lower portion with a semi-circular cross-section and an upper portion with a rectangular cross-section, including a lower semi-cylindrical sidewall 110 extending around a horizontal central axis 109, a pair of upper sidewalls 111 extending vertically upward from the top of the lower semi-cylindrical sidewall, a top plate 112 extending between the pair of upper sidewalls 111, a first end plate (not shown) near the ion generating unit 7, and a second end plate (not shown) away from the ion generating unit 7. A sludge inlet 101 is located at the top plate 112 of the housing 10, a sludge outlet 103 is located at the bottom of the second end plate of the housing 10, an exhaust port 102 is located at the top plate 112 of the housing 10, and a drain port 104 is located at the bottom of the lower semi-cylindrical sidewall 110 of the housing 10. Filter screen holders 4 and filter screens 3 cover part or all of the lower semi-cylindrical sidewall 110 of the housing 10. Figure 13This is a schematic side cross-sectional view of a sludge treatment system according to another example of the invention, showing a double hollow shaft / double helix structure. The housing 10 has a rectangular cross-section and includes a bottom plate 114, a pair of upper sidewalls 111 extending vertically upward from the bottom plate 114, a top plate 112 extending between the pair of upper sidewalls 111, a first end plate near the ion generating unit 7, and a second end plate away from the ion generating unit 7. A sludge inlet 101 is located at the top plate 112 of the housing 10 near the first end plate, a sludge outlet 103 is located at the bottom of the second end plate of the housing 10, an exhaust port 102 is located at the top plate 112 of the housing 10, and a drain port 104 is located at the bottom plate 114 of the housing 10. Two hollow shafts 2 are arranged side-by-side within the housing 10. Filter screen holders 4 and filter screens 3 at least cover the bottom plate 114 of the housing 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 invention. It should also be understood that... Figure 6 , Figure 7 , Figure 13 The cross-sectional shape of the housing 10 shown is merely an example; those skilled in the art can employ any other suitable cross-sectional shape of the housing 10 as needed, for example... Figure 13 The base plate 114 is configured as a double semicircle or other shape without departing from the scope of the invention.

[0053] According to one example, the filter holder 4 and the filter 3 are disposed in the lower portion of the housing 10. The filter holder 4 and the filter 3 may cover the entire lower portion of the housing 10, or they may cover only a portion of the lower portion of the housing 10, such as... Figure 6 and 7 As shown. The mesh size of filter screen 3 is set to allow water to pass through while preventing sludge from passing through. Filter screen holder 4 also takes the form of a sieve and extends the same extent as filter screen 3 for better support. The mesh size of filter screen holder 4 is significantly larger than that of filter screen 3 to reduce water flow resistance. According to one example, filter screen holder 4 is made of metal and is mounted to housing 10 via an insulating frame. According to another example, filter screen holder 4 is made of metal and has an insulating element on its outer surface.

[0054] Figure 8This is a schematic diagram of an ion generating unit in 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 distance 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 are ionized, generating positive and negative ions. If the distance d is too close, the high-voltage positive electrode ring 701 and the high-voltage negative electrode ring 702 will break down the air, generating an electric arc, which affects ion formation; if the distance d is too far, the ionization effect is reduced, and the efficiency of ion generation is greatly reduced.

[0055] The present invention also provides a sludge treatment method using a sludge treatment system to dry sludge, comprising: introducing the sludge to be dried into the shell chamber 1 through the sludge inlet 101; connecting the electrolysis power supply, starting the ion generating unit 7 and the blower 8, and driving the hollow shaft 2 to rotate, so that the ion generating unit 7 generates cations and anions, the hollow shaft 2 carries a positive charge, and a portion 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; and after the sludge drying is completed, discharging the dried sludge through the sludge outlet 103.

[0056] In addition, the drive device of the hollow shaft 2 can be activated to make the hollow shaft 2 rotate, which drives the hollow branch pipe 202 and the blade 205 to rotate. This has the functions of stirring, dispersing, electrifying and pushing the sludge. It 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 dewatering effect.

[0057] 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. A portion of the anions are adsorbed by the positive electrode of the electrolytic power source and the hollow shaft, while the cations continue to enter the shell chamber 1 and react with the sludge that is stirred and dispersed by the blades 205, thereby degrading the sludge double layer, dewatering the sludge, and discharging it after the water is removed by the filter screen 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 electrolysis power supply, and the filter screen fixing member 4 is connected to the negative electrode 5 of the electrolysis power supply, so that the sludge is placed in the stirring electric field, thereby the direct current contacts the sludge body and accelerates the degradation of the sludge double layer.

[0059] With the help of the sludge treatment system according to the present invention, since the sludge is an organic material, the direct current flowing through the sludge will generate a thermal effect, thereby raising the temperature of the sludge itself. Combined with the stirring and crushing of the branch pipe 202 and the blade 205, the heated sludge is fully exposed to the air, and then further accelerated by the action of cations to achieve the drying effect.

[0060] In summary, without the need for chemical additives, the cations generated by the ion generating unit come into contact with and fully react with the negative charges, organic matter, and heavy metals in the sludge, thereby removing heavy metals and efficiently dewatering. Some of the anions generated react with toxic gases, thereby removing harmful gases, so that the finished sludge achieves the effects of drying, dewatering, and being non-toxic and odorless.

[0061] The embodiments described in this disclosure are intended as non-limiting examples, and other embodiments may take various and alternative forms. Furthermore, the drawings are not necessarily to scale and may present simplified expressions of some features of this disclosure, including, for example, specific dimensions, orientations, positions, and shapes. Details associated with such features will be determined in part by the intended application and usage 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” should be both conjunctions and adversative conjunctions; and the words “including,” “contains,” “has,” etc., should mean “including but not limited to.” Furthermore, approximate words such as “about,” “almost,” “basically,” “roughly,” “approximately,” etc., may be used herein in the sense of “being, close to, or almost being,” or “within 0-5% of,” or “within acceptable manufacturing tolerances,” or any logical combination thereof. As used herein, a component “configured” to perform the specified function is capable of performing the specified function without alteration, and not merely has the potential to perform the specified function after further modification. In other words, the described hardware, 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. Furthermore, the use of ordinal numbers such as first, second, and third does not necessarily imply an order of sequence, but may simply be a distinction between multiple instances of an action or structure.

[0063] The detailed description and accompanying drawings are supporting and descriptive of this teaching, but the scope of this teaching is defined only by the claims. While the best mode and some other embodiments for carrying out this teaching have been described in detail, various alternative designs and embodiments exist for practicing the teaching as defined in the appended claims. Furthermore, this disclosure expressly includes combinations and sub-combinations of the elements and features set forth above and below.

Claims

1. A sludge treatment system, comprising: A housing (10) defines a housing chamber (1) and extends about 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 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) disposed in the housing (10) and an extension portion (211) extending from one end of the hollow shaft (2) to the outside of the housing (10). The main shaft portion (210) includes an internal cavity (201) and an air outlet (209). The air outlet (209) is in fluid communication with the internal cavity (201) and extends through the side wall of the main shaft portion (210). A filter screen fixing piece (4) is provided on the lower part of the housing (10). The filter screen (3) is fixed to the lower part of the housing (10) by the filter screen fastener (4); An ion generating unit (7) is disposed within the protrusion (211) of the hollow shaft (2) and configured to generate air that is ionized and enters the internal chamber (201) of the main shaft to generate cations and anions. A fan (8), which is in fluid communication with the internal chamber (201) of the main shaft and is located upstream of the ion generating unit (7), is configured to blow air at a predetermined flow rate into the internal chamber (201) of the main shaft; and 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 screen fixing member (4). The positive electrode (6) and negative electrode (5) are configured to generate an electric field between the hollow shaft (2) and the filter screen fixing component (4) to dry the sludge. The positive electrode (6) is configured to give the hollow shaft (2) a positive charge. Some of the anions generated by the ion generating unit (7) are adsorbed and neutralized by the positive charge on the hollow shaft (2). Some of the anions generated by the ion generating unit react with toxic gases to remove harmful gases. The cations generated by the ion generating unit (7) enter the sludge and come into contact with the negative charge, organic matter and heavy metals in the sludge and react to remove heavy metals and dehydrate the sludge, so as to facilitate the drying of the sludge. The hollow shaft (2) is rotatable around a horizontal central axis (109). The sludge treatment system also includes a plurality of hollow branch pipes (202) arranged around the main shaft portion (210) of the hollow shaft (2). The hollow branch pipe (202) includes 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 a relative 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 the side wall of the hollow branch pipe (202) and in fluid communication with the branch pipe internal chamber (207). 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).

2. The sludge treatment system according to claim 1, wherein, The hollow branch pipe (202) also includes blades (205) disposed on the outer surface of the hollow branch pipe (202).

3. The sludge treatment system according to claim 2, wherein, The blade (205) extends along the axis of the hollow branch pipe (202).

4. The sludge treatment system according to claim 3, wherein, The plurality of hollow branch pipes (202) are arranged in multiple rows along the main shaft portion (210) of the hollow shaft (2), each row including a group of hollow branch pipes (202) spaced apart around the corresponding outer circumference (212) of the main shaft portion (210) of the hollow shaft (2).

5. The sludge treatment system according to claim 2, wherein, The blade (205) extends obliquely relative to the axis of the hollow branch (202).

6. The sludge treatment system according to claim 5, wherein, The plurality of hollow branch pipes (202) are arranged at intervals in a spiral path on the outer surface of the main shaft portion (210) of the hollow shaft (2).

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

8. The sludge treatment system according to claim 1, wherein, The shell (10) is cylindrical and includes a cylindrical sidewall (113) extending around a horizontal central axis (109), a first circular end plate near the ion generating unit (7) and a second circular end plate away from the ion generating unit (7). The sludge inlet (101) is located at the top of the cylindrical sidewall (113) of the shell (10) and near the first circular end plate. The sludge outlet (103) is located at the bottom of the second circular end plate of the shell (10). The exhaust port (102) is located at the top of the cylindrical sidewall (113) of the shell (10) and the drain port (104) is located at the bottom of the cylindrical sidewall (113) of the shell (10).

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

10. The sludge treatment system according to claim 1, wherein, The housing (10) has a rectangular cross-section and includes a bottom plate (114), a pair of upper sidewalls (111) extending vertically upward from the bottom plate (114), a top plate (112) extending between the pair of upper sidewalls (111), a first end plate near the ion generating unit (7) and a second end plate away from the ion generating unit (7). A sludge inlet (101) is located at the top plate (112) of the housing (10) near the first end plate. A sludge outlet (103) is located at the bottom of the second end plate of the housing (10). An exhaust port (102) is located at the top plate (112) of the housing (10). A drain port (104) is located at the bottom plate (114) of the housing (10). At least two hollow shafts (2) are arranged side by side inside the housing (10).

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

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

13. The sludge treatment system according to claim 1, wherein, The filter screen (3) is positioned below the filter screen fixing part (4) so ​​that the filter screen fixing part (4) which is electrically connected to the negative electrode (5) of the electrolysis power supply can better contact the sludge to facilitate the degradation of the sludge double layer.

14. The sludge treatment system according to claim 1, wherein, The filter screen (3) is positioned above the filter screen fixing piece (4).

15. A sludge treatment method for drying sludge using a sludge treatment system according to any one of claims 1 to 14, comprising: The sludge to be dried is introduced into the shell chamber (1) through the sludge inlet (101); When the electrolysis power supply is turned on, 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) carries a positive charge. Some 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; as well as After the sludge drying is completed, the dried sludge is discharged through the sludge outlet (103).

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