Excess sludge pretreatment system

Abstract

The utility model relates to an excess sludge pretreatment system which comprises a treatment unit and a dosing unit, and the treatment unit comprises a reaction container with an inner cavity and an ultrasonic generator arranged in the inner cavity; in the horizontal direction, an input port and an output port are respectively formed in two opposite ends of the reaction container, and the residual sludge enters the inner cavity from the input port and flows to the output port; the ultrasonic generator is arranged at a position close to the input port and is configured to emit ultrasonic waves towards the output port; the chemical adding unit comprises a chemical container and a chemical conveying pipe for communicating the chemical container to the reaction container, and the chemical conveying pipe is constructed to be communicated to the position adjacent to the input port; a medicament solution stored in the medicament container is configured to be conveyed into the inner cavity through the medicament conveying pipe. The problem that equipment selectivity in a traditional treatment system is single is solved, ultrasonic waves and agents act together, the advantages of the two treatment modes complement each other, and therefore the conditioning effect and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of sludge treatment, in particular to a residual sludge pretreatment system. BACKGROUND

[0002] Excess activated sludge refers to the activated sludge discharged from the secondary sedimentation tank (or sedimentation zone) of the activated sludge system. In the biochemical treatment process, microorganisms in the activated sludge continuously consume organic matter in wastewater. Among the consumed organic matter, part of the organic matter is oxidized to provide energy required for the life activities of microorganisms, and another part of the organic matter is utilized by microorganisms to synthesize new cell mass, so as to reproduce the microorganisms. While the microorganisms are metabolizing, part of the old microorganisms also die, thus producing excess activated sludge.

[0003] The rapid growth of sewage treatment plants and the rapid improvement of sewage treatment capacity in China have to some extent eased the pressure of urban sewage treatment, but the production of excess activated sludge in the sewage treatment process dominated by activated sludge method has also increased year by year. In the future for a long period of time, the activated sludge method will still be the most widely used and mature sewage treatment technology in China, so efficient treatment and disposal of excess activated sludge has become a hot research direction of environmental workers. However, the existing technology has a single treatment method, device or system for excess activated sludge, and there are technical problems to be solved, such as insufficient sludge retention time, low conditioning efficiency, high treatment cost, etc. CONTENT OF THE INVENTION

[0004] The present disclosure provides a residual sludge pretreatment system to solve the problems in the prior art.

[0005] According to a first aspect of the present disclosure, a residual sludge pretreatment system is provided, comprising:

[0006] A treatment unit comprising a reaction container having an inner cavity, and an ultrasonic generator arranged in the inner cavity; in the horizontal direction, opposite ends of the reaction container are respectively provided with an input port and an output port, and the residual sludge is configured to flow into the inner cavity from the input port and flow towards the output port; the ultrasonic generator is arranged adjacent to the input port and is configured to emit ultrasonic waves towards the output port;

[0007] A dosing unit comprising a medicament container and a medicament delivery pipe connecting the medicament container to the reaction container, the medicament delivery pipe being configured to be connected to a position adjacent to the input port; the medicament solution stored in the medicament container is configured to be delivered into the inner cavity through the medicament delivery pipe.

[0008] In one embodiment of this disclosure, a fixed bracket extending vertically is provided in the inner cavity near the input port; multiple ultrasonic generators are provided, and the multiple ultrasonic generators are mounted at intervals in the vertical direction on the fixed bracket.

[0009] In one embodiment of this disclosure, a plurality of the ultrasonic generators are configured to be equidistantly arranged in the vertical direction.

[0010] In one embodiment of this disclosure, an ultrasonic amplitude transformer is mounted on the ultrasonic generator.

[0011] In one embodiment of this disclosure, the reaction vessel is provided with an access hole, the size of which is configured to be at least larger than the size of the ultrasonic generator.

[0012] In one embodiment of this disclosure, a stirring device is provided inside the drug container, and the input end of the drug delivery tube is connected to the lower part of the drug container; the output end of the drug delivery tube is connected to the reaction vessel at a position between the input port and the ultrasonic generator, or the drug delivery tube is connected to the reaction vessel at a position after and adjacent to the ultrasonic generator.

[0013] In one embodiment of this disclosure, a dosing pump, a check valve, and a gate valve are sequentially arranged on the drug delivery pipe in the flow direction.

[0014] In one embodiment of this disclosure, the length from the ultrasonic generator to the output port in the horizontal direction is denoted as L; the effective volume of the inner cavity... Where Q is the amount of residual sludge to be treated, and T is the ultrasonic treatment time; the relationship between the diameter D and L of the reaction vessel is as follows: .

[0015] In one embodiment of this disclosure, the ultrasonic wave action time T is 30-120 seconds.

[0016] In one embodiment of this disclosure, an inlet flange is fastened to the inlet port, and a first flow meter is provided on the inlet flange. The first flow meter is used to obtain the flow rate of the residual sludge delivered to the inner cavity. A second flow meter is provided on the drug delivery pipe, and the second flow meter is used to obtain the flow rate of the drug solution delivered to the inner cavity.

[0017] In one embodiment of this disclosure, an outlet flange is fastened to the outlet position, and one or more processing units are provided; when multiple processing units are provided, the multiple processing units are configured to be connected sequentially, wherein the outlet flange of the upstream processing unit is configured to be connected to the inlet flange of its downstream adjacent processing unit.

[0018] In one embodiment of this disclosure, the outlet flange of the final stage processing unit is configured to connect to a mechanical dewatering system to transport the pretreated residual sludge to the mechanical dewatering system for dewatering.

[0019] One beneficial effect of this disclosure is that by setting up a processing unit including an ultrasonic generator and a dosing unit, ultrasonic waves and chemicals are used synergistically to pretreat excess sludge, solving the problem of limited equipment selectivity in traditional treatment systems. Furthermore, the combined action of ultrasonic waves and chemicals, with their complementary advantages, improves the conditioning effect and efficiency. The excess sludge enters the reaction vessel through the inlet and flows continuously to the outlet. This disclosure places the ultrasonic generator near the inlet and emits ultrasonic waves towards the outlet. This ensures that the ultrasonic waves continuously interact with the excess sludge for most of the time it remains in the inner cavity, effectively improving the dewatering performance of the excess sludge and achieving sludge volume reduction.

[0020] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0022] Figure 1 This is a schematic diagram of the structure of a residual sludge pretreatment system provided in an embodiment of this disclosure;

[0023] Figure 2 This is a schematic diagram of the system structure of two processing units connected in series according to an embodiment of this disclosure;

[0024] Figure 3 This is a schematic diagram of the system structure provided in one embodiment of the present disclosure, showing three processing units connected in series.

[0025] Figures 1 to 3 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows:

[0026] 10. Processing unit; 20. Dosing unit; 30. Control unit; 1. Reaction vessel; 11. Inner cavity; 12. Inlet; 121. Inlet flange; 122. First flow meter; 13. Outlet; 131. Outlet flange; 14. Inspection hole; 2. Ultrasonic generator; 21. Fixed bracket; 3. Chemical container; 31. Stirring device; 4. Drug delivery pipe; 41. Dosing pump; 42. Check valve; 43. Gate valve; 44. Second flow meter; 5. Connecting pipeline; 6. Support frame. Detailed Implementation

[0027] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0031] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0032] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0033] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0034] refer to Figures 1 to 3 This disclosure discloses a waste sludge pretreatment system, comprising: a treatment unit 10 and a dosing unit 20, wherein the treatment unit 10 is the main site for treating waste sludge, and includes a reaction vessel 1 with an inner cavity 11, and an ultrasonic generator 2 disposed within the inner cavity 11. The reaction vessel 1 can be a container commonly used in the art, such as a reaction tank or reaction chamber. Figure 1 As shown, in this embodiment, reaction vessel 1 is a horizontal reaction tank as an example for explanation.

[0035] The ultrasonic generator 2 can directionally emit sound waves (i.e., ultrasound) from 20 kHz to 10 MHz. It should be noted that during the propagation of ultrasound in sludge, it generates hydraulic cavitation, mechanical, and thermal effects, thereby breaking down sludge flocs and bacterial flocs, destroying sludge granular cells and extracellular polymeric substances (EPS), reducing sludge floc size, and thus improving sludge dewatering performance. More specifically, the principle of ultrasonic sludge treatment is mainly based on the cavitation effect of ultrasound: when ultrasound propagates in sludge, the sludge is under negative pressure. When the tension exceeds the cohesion, tiny cavitation bubbles appear. These bubbles are compressed until they collapse during the sound wave compression phase, forming instantaneous high temperature and high pressure, generating high shear force, breaking down the cell walls of microorganisms, destroying the sludge floc structure, and causing enzymes and cytoplasm to dissolve from the cells, thereby altering the biological, chemical, and physical properties of the sludge.

[0036] like Figure 1 As shown, in the horizontal direction, the reaction vessel 1 has an inlet 12 and an outlet 13 at opposite ends, respectively. The residual sludge is configured to enter the inner cavity 11 through the inlet 12 and flow towards the outlet 13. (Reference) Figure 1 In terms of view orientation, the input port 12 can be located on the left side of the reaction vessel 1, and the output port 13 can be located on the right side of the reaction vessel 1.

[0037] In one specific embodiment of this disclosure, the inlet 12 can be located at the upper part of the reaction vessel 1, and the outlet 13 can be located at the lower part of the reaction vessel 1. The residual sludge entering the inner cavity from the upper left inlet 12 can flow naturally to the lower right outlet 13 under the action of gravity and the thrust of the newly entering sludge from upstream. This makes it easier to control the residence time of the residual sludge in the inner cavity 11 of the reaction vessel 1, and makes it easier to empty the residual sludge in the inner cavity 11, thus preventing residue.

[0038] like Figure 1 As shown, the ultrasonic generator 2 is positioned near the inlet 12 and configured to emit ultrasonic waves toward the outlet 13. The excess sludge enters the reaction vessel 1 through the inlet 12 and continuously flows toward the outlet 13. By positioning the ultrasonic generator 2 near the inlet 12 and emitting ultrasonic waves toward the outlet 13, the ultrasonic waves can continuously interact with the excess sludge for most of the time it remains in the inner cavity 11, thereby effectively improving the dewatering performance of the excess sludge and achieving sludge volume reduction.

[0039] In one specific embodiment of this disclosure, an ultrasonic amplitude transformer is installed on the ultrasonic generator 2, thereby achieving further ultrasonic energy focusing. Specifically, the ultrasonic amplitude transformer is a functional component that works with the ultrasonic generator 2 to change the amplitude of ultrasonic vibration. Its main function is to change the amplitude of the ultrasonic waves output by the ultrasonic generator 2, increase the vibration velocity ratio, and improve efficiency. It can amplify the displacement or velocity of mechanically vibrating particles and concentrate ultrasonic energy on a smaller area (i.e., energy focusing). By setting the ultrasonic amplitude transformer, this disclosure can further improve the effect of ultrasonic treatment of residual sludge and facilitate users to adjust the output amplitude of the ultrasonic generator 2 according to specific application scenarios, thereby obtaining the best treatment effect.

[0040] Ultrasonic conditioning alone has low efficiency in sludge conditioning; therefore, the combined chemical dosing method disclosed in this paper can achieve complementary advantages and further improve conditioning efficiency. Specifically, such as... Figure 1 As shown, the dosing unit 20 includes a reagent container 3 and a delivery pipe 4 connecting the reagent container 3 to the reaction vessel 1. The delivery pipe 4 is configured to connect to a position adjacent to the inlet 12, and the reagent solution stored in the reagent container 3 is configured to be delivered to the inner cavity 11 through the delivery pipe 4. This disclosure, by setting up a processing unit 10 including an ultrasonic generator 2 and a dosing unit 20, realizes the synergistic pretreatment of residual sludge by ultrasonic waves and reagents, solving the problem of limited equipment selectivity in traditional treatment systems.

[0041] Specifically, the reagent container 3 is used to store the reagent solution. In one embodiment of this disclosure, the reagent solution includes one or more of hydrogen peroxide, chitosan, polyacrylamide, alkali, ozone, Fenton's reagent, and persulfate. These reagents themselves can condition sludge, and when combined with ultrasonic treatment, their sludge-breaking effect and efficiency are effectively improved. In specific treatment, different reagents can be flexibly selected and added based on the specific composition, type, and state of the remaining sludge, thereby making the system of this disclosure applicable to more treatment scenarios and improving the selectivity of reagents.

[0042] Furthermore, ultrasound can accelerate the mixing of reagents and residual sludge, improving mixing efficiency. The cavitation, thermal, and mechanical effects generated by ultrasound propagation in liquids can work together on reagent particles, promoting their dissolution and dispersion. This allows the reagents to mix better with the residual sludge, thereby enhancing the treatment effect of the reagents on the sludge. Specifically, the shock waves and microjets generated during cavitation can break the surface tension of reagent particles, making them easier to dissolve; when ultrasound propagates in liquids, some of its energy is converted into heat energy, and the increased temperature helps reduce the solubility of the reagents, accelerating dissolution; the vibration energy of ultrasound can strongly agitate the reagent particles in the liquid, thereby increasing the contact area between the particles and the solvent and increasing the dissolution rate.

[0043] Furthermore, ultrasound can promote the activation of some agents, such as persulfate. The high temperature and high pressure energy generated by the cavitation process can excite persulfate, causing the peroxy bond (—O—O—) in its molecule to break, thereby generating sulfate free radicals with strong oxidizing power. It is evident that in the system disclosed herein, the combined action of ultrasound and the agent allows the advantages of the two treatment methods to complement each other, thus improving the conditioning effect and efficiency.

[0044] In one embodiment of this disclosure, such as Figure 1 As shown, a fixed bracket 21 extending vertically is provided in the inner cavity 11 near the inlet 12. Multiple ultrasonic generators 2 are provided, and the multiple ultrasonic generators 2 are installed at intervals in the vertical direction on the fixed bracket 21. The effective range of a single ultrasonic generator 2 is relatively limited, so multiple ultrasonic generators 2 can be provided, so that the entire inner cavity 11 can be basically covered by ultrasonic waves, thereby improving the uniformity of residual sludge treatment.

[0045] In a preferred embodiment of this disclosure, the plurality of ultrasonic generators 2 are configured to be equidistantly arranged in the vertical direction, thereby further improving the uniformity of the treatment of excess sludge. In the vertical direction, there is no situation where multiple ultrasonic generators 2 are densely arranged in some heights while ultrasonic generators 2 are not arranged in other heights. The equidistant arrangement of the plurality of ultrasonic generators 2 ensures that the excess sludge at each height position can be substantially uniformly covered by ultrasonic waves, thereby ensuring the uniformity and stability of the treatment.

[0046] like Figure 1As shown, the upper and lower ends of the fixed bracket 21 can be fixed to the inner wall of the reaction vessel 1 near the inlet 12, respectively. Multiple ultrasonic generators 2 are vertically spaced in the inner cavity 11 near the inlet 12 via the fixed bracket 21. This ensures that the distance between each ultrasonic generator 2 and the opposite ends of the reaction vessel 1 is basically the same, thus ensuring that residual sludge at any height can be treated by ultrasonic waves as it flows from the fixed bracket 21 to the outlet 13.

[0047] In one embodiment of this disclosure, such as Figure 1 As shown, the reaction vessel 1 has an inspection hole 14, the size of which is at least larger than the size of the ultrasonic generator 2. Under normal operating conditions, the inspection hole 14 remains closed; only when maintenance or cleaning of the reaction vessel 1 and its internal cavity 11 is required can the user open the inspection hole 14 to expose the internal cavity 11 for maintenance and cleaning. Maintenance includes at least replacing the ultrasonic generator 2; therefore, the size of the inspection hole 14 must be at least larger than the size of the ultrasonic generator 2 to allow the user to install or remove the ultrasonic generator 2 through the inspection hole 14.

[0048] In one embodiment of this disclosure, such as Figure 1 As shown, a stirring device 31, which can be a stirring paddle, is installed inside the reagent container 3. By installing the stirring device 31, the concentration of the reagent solution can be ensured to be uniform, avoiding the problem of uneven solution concentration caused by sedimentation. In addition, it can also accelerate the dissolution and mixing of the reagent solution. The inlet end of the drug delivery tube 4 is connected to the lower part of the reagent container 3, and the outlet end of the drug delivery tube 4 is connected to the reaction container 1 at the position between the inlet 12 and the ultrasonic generator 2, or the drug delivery tube 4 is connected to the reaction container 1 at the position after and adjacent to the ultrasonic generator 2.

[0049] This disclosure does not limit the specific connection of the output end of the drug delivery tube 4 to the front or rear end of the ultrasonic generator 2, as long as the drug delivery location is close to the ultrasonic generator 2. When connected to the front end, the remaining sludge is preferentially mixed with the agent before flowing to the rear end of the ultrasonic generator 2, thereby achieving a synergistic effect between the agent and the ultrasound. When connected to the rear end, the ultrasound first acts on the remaining sludge, and then mixes with the agent, thereby achieving a synergistic effect between the agent and the ultrasound.

[0050] In one embodiment of this disclosure, a dosing pump 41, a check valve 42, and a gate valve 43 are sequentially arranged on the dosing pipe 4 in the flow direction. The gate valve 43 controls the opening and closing of the dosing pipe 4; the dosing pump 41 provides power, allowing the drug solution stored in the drug container 3 to flow through the dosing pipe 4 to the inner cavity 11 when it is open; the check valve 42 prevents backflow of the drug solution within the dosing pipe 4, thereby preventing contamination of the drug container 3.

[0051] It should be noted that existing technologies pay little attention to the interaction time between sludge and ultrasound, often neglecting the impact of this interaction time on the conditioning effect. If the interaction time is too short, insufficient reaction can lead to poor dewatering. Furthermore, insufficient residence time of the remaining sludge in the inner cavity 11 results in insufficient mechanical energy input, leading to less disruption of the sludge flocs and consequently, low conditioning efficiency. Conversely, if the interaction time is too long, over-reaction occurs, causing excessive breakage of the remaining sludge, which also degrades the dewatering effect. To address these issues, the dimensions of the reaction vessel 1 need to be clearly defined to control the residence time of the remaining sludge within it, thereby ensuring the effectiveness of ultrasonic conditioning.

[0052] Specifically, in one embodiment of this disclosure, such as Figure 1 As shown, in the horizontal direction, the length from the ultrasonic generator 2 to the output port 13 is denoted as L. It can be understood that the portion between the ultrasonic generator 2 and the output port 13 is the area where the ultrasonic waves actually treat the remaining sludge. The effective volume of the inner cavity 11... Where Q is the amount of excess sludge to be treated, and T is the ultrasonic treatment time; the relationship between the diameter D and L of reaction vessel 1 is as follows: .

[0053] In a preferred embodiment of this disclosure, the ultrasonic treatment time T is 30-120 seconds, where the value of T is highly dependent on the type and properties of the sludge being treated, and the specific value should be determined based on experimental conditions. The amount of residual sludge to be treated, Q, can be determined according to the actual working conditions. Based on the ratio of Q to T, the effective volume V of the inner cavity 11 most suitable for the current working conditions can be calculated, thus obtaining the accurate relationship between L and D, thereby determining the shape of the reaction vessel 1. The reaction vessel 1 designed in this way ensures that the residence time of the residual sludge in the inner cavity 11 is sufficient for reaction without over-reaction, thereby improving the ultrasonic conditioning effect and conditioning efficiency.

[0054] In one embodiment of this disclosure, reference is made to Figure 1An inlet flange 121 is securely connected to the inlet port 12. A first flow meter 122 is installed on the inlet flange 121. The first flow meter 122 is used to obtain the flow rate of the excess sludge delivered to the inner cavity 11, thereby enabling real-time monitoring, recording, and statistical analysis of the excess sludge flow rate. A second flow meter 44 is installed on the drug delivery pipe 4. The second flow meter 44 is used to obtain the flow rate of the drug solution delivered to the inner cavity 11, thereby enabling real-time monitoring, recording, and statistical analysis of the drug solution flow rate.

[0055] Furthermore, the waste sludge pretreatment system also includes a control unit 30, which is configured to communicate with the treatment unit 10 and the dosing unit 20 respectively. The control unit 30 is configured to control the output parameters of the ultrasonic generator 2 and the dosing unit 20 based on the waste sludge flow rate and the reagent solution flow rate. The first flow meter 122 and the second flow meter 44 can transmit their recorded waste sludge flow rate data and reagent solution flow rate data to the control unit 30, thereby enabling the control unit 30 to adjust the ultrasonic generator 2 and the dosing unit 20 in real time based on the above data, thereby achieving a better conditioning effect.

[0056] In one specific embodiment of this disclosure, the output parameters of the ultrasonic generator 2 include: ultrasonic power, and / or, ultrasonic frequency, and / or, ultrasonic output duration. Those skilled in the art will know that frequency has the greatest impact on the dewatering performance of ultrasonic treatment of sludge, followed by power, and then the duration of action. Furthermore, low frequency, low acoustic energy density, and short ultrasonic treatment time have the best effect on enhancing the dewatering effect of ultrasonic treatment of sludge.

[0057] This disclosure enables coordinated central control of the treatment unit 10 and the dosing unit 20. The control unit 30 can adjust parameters such as the power, frequency, and output duration of the ultrasonic waves, as well as the dosage of the reagents, online, thereby improving treatment efficiency. For example, when the residual sludge flow rate is large, the power, frequency, and output duration of the ultrasonic waves, as well as the dosage of the reagents, can be appropriately increased to enhance the treatment intensity and ensure the treatment effect. When the residual sludge flow rate is small, the power, frequency, and output duration of the ultrasonic waves, as well as the dosage of the reagents, can be appropriately decreased to avoid excessive treatment intensity, which could lead to over-crushing of the residual sludge and waste of reagents, resulting in cost waste.

[0058] In one embodiment of this disclosure, an outlet flange 131 is fastened to the outlet 13 location, see reference. Figure 1 The processing unit 10 is provided with one or more, for example in Figures 1 to 3 Only one processing unit 10 is set up in the middle. Figure 1 There are two processing units 10 in the middle. Figure 2The device is equipped with three processing units 10. More processing units 10 can be set according to actual needs, and this disclosure does not impose specific restrictions on this.

[0059] like Figure 3 and Figure 2 As shown, when multiple processing units 10 are provided, the multiple processing units 10 are configured to be connected sequentially, wherein the outlet flange 131 of the upstream processing unit 10 is configured to be connected to the inlet flange 121 of its downstream adjacent processing unit 10. This disclosure fully considers the flow rate of residual sludge in the reaction vessel 1 and the ultrasonic treatment time. When the residual sludge flow rate is large and the flow rate is fast, the residence time of the sludge in the inner cavity 11 may be insufficient, and setting only one processing unit 10 may lead to poor treatment effect. Therefore, this disclosure can set multiple sequentially connected processing units 10, thereby extending the reaction time between the residual sludge and the ultrasonic waves and ensuring the treatment effect.

[0060] The outlet flange 131 of the upstream treatment unit 10 can be connected to the inlet flange 121 of the downstream adjacent treatment unit 10, so that all the mixture in the inner cavity 11 of the upstream treatment unit 10 flows into the inner cavity of the next treatment unit 10 to continue the ultrasonic reaction. Since the reagent solution has already been added to the inner cavity 11 of the upstream treatment unit 10 and the reagent has been fully mixed into the remaining sludge, there is no need to add the reagent again in the downstream treatment unit 10, thereby reducing the treatment cost.

[0061] In one specific embodiment of this disclosure, reference is made to Figure 3 This disclosure allows multiple processing units 10 to be placed on the same horizontal plane, for example, all on the ground. When connecting two adjacent processing units 10, since there is a height difference between the outlet flange 131 of the upstream processing unit 10 and the inlet flange 121 of the downstream adjacent processing unit 10, they cannot be directly connected. Therefore, they can be connected through a connecting pipeline 5. A pump body can be installed on the connecting pipeline 5 to provide power for the residual sludge in the upward path of the connecting pipeline 5, ensuring smooth transport in the connecting pipeline 5.

[0062] In another specific embodiment of this disclosure, reference is made to Figure 2 Figure 3 Each treatment unit 10 is placed on a horizontal plane at a different height. The outlet flange 131 of the upstream treatment unit 10 can be directly connected to the inlet flange 121 of the adjacent downstream treatment unit 10. Due to the inherent height difference between them, an additional support frame 6 is required to elevate the upstream treatment unit 10. This eliminates the need for additional piping, and as the height of the treatment units 10 gradually decreases in the overall flow direction, the remaining sludge can flow naturally downstream under gravity, thus eliminating the need for an additional power source and saving on driving costs.

[0063] In one embodiment of this disclosure, the outlet flange 131 of the final treatment unit 10 is configured to connect to a mechanical dewatering system to convey the pretreated residual sludge to the mechanical dewatering system for dewatering. It is understood that the mechanical dewatering system is a downstream treatment system of the residual sludge pretreatment system provided in this disclosure. The residual sludge pretreated by the system of this disclosure has improved dewatering performance, thus making it easier to undergo subsequent mechanical dewatering.

[0064] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A waste sludge pretreatment system, characterized in that, include: The processing unit (10) includes a reaction vessel (1) having an inner cavity (11) and an ultrasonic generator (2) disposed in the inner cavity (11); in the horizontal direction, an inlet (12) and an outlet (13) are respectively disposed at opposite ends of the reaction vessel (1), and the remaining sludge is configured to enter the inner cavity (11) through the inlet (12) and flow toward the outlet (13); the ultrasonic generator (2) is disposed adjacent to the inlet (12) and is configured to emit ultrasonic waves toward the outlet (13); The dosing unit (20) includes a drug container (3) and a delivery tube (4) connecting the drug container (3) to the reaction vessel (1), the delivery tube (4) being configured to connect to a location adjacent to the inlet (12); the drug solution stored in the drug container (3) is configured to be delivered to the inner cavity (11) through the delivery tube (4).

2. The waste sludge pretreatment system according to claim 1, characterized in that, A fixed bracket (21) extending vertically is provided in the inner cavity (11) near the input port (12); multiple ultrasonic generators (2) are provided, and multiple ultrasonic generators (2) are installed at intervals in the vertical direction on the fixed bracket (21).

3. The waste sludge pretreatment system according to claim 2, characterized in that, The multiple ultrasonic generators (2) are configured to be equidistant in the vertical direction.

4. The waste sludge pretreatment system according to claim 1, characterized in that, An ultrasonic amplitude transformer is installed on the ultrasonic generator (2).

5. The waste sludge pretreatment system according to claim 1, characterized in that, The reaction vessel (1) is provided with an inspection hole (14), the size of which is configured to be at least larger than the size of the ultrasonic generator (2).

6. The waste sludge pretreatment system according to claim 1, characterized in that, The medicine container (3) is equipped with a stirring device (31), and the input end of the drug delivery tube (4) is connected to the lower part of the medicine container (3); the output end of the drug delivery tube (4) is connected to the reaction container (1) at the position between the input port (12) and the ultrasonic generator (2), or the drug delivery tube (4) is connected to the reaction container (1) at the position after and adjacent to the ultrasonic generator (2).

7. The waste sludge pretreatment system according to claim 1, characterized in that, In the flow direction, the drug delivery pipe (4) is sequentially equipped with a drug delivery pump (41), a check valve (42) and a gate valve (43).

8. The waste sludge pretreatment system according to claim 1, characterized in that, In the horizontal direction, the length from the ultrasonic generator (2) to the output port (13) is denoted as L; the effective volume of the inner cavity (11) Where Q is the amount of residual sludge to be treated, and T is the ultrasonic treatment time; the relationship between the diameter D and L of the reaction vessel (1) is as follows: .

9. The waste sludge pretreatment system according to claim 8, characterized in that, The duration of the ultrasonic wave, T, is 30-120 seconds.

10. The waste sludge pretreatment system according to claim 1, characterized in that, An inlet flange (121) is fastened to the inlet port (12), and a first flow meter (122) is provided on the inlet flange (121). The first flow meter (122) is used to obtain the flow rate of the residual sludge transported to the inner cavity (11). A second flow meter (44) is provided on the drug delivery pipe (4), and the second flow meter (44) is used to obtain the flow rate of the drug solution transported to the inner cavity (11).

11. The waste sludge pretreatment system according to claim 10, characterized in that, The output port (13) is fastened to an outlet flange (131), and one or more processing units (10) are provided; when multiple processing units (10) are provided, the multiple processing units (10) are configured to be connected in sequence, wherein the outlet flange (131) of the upstream processing unit (10) is configured to be connected to the inlet flange (121) of its downstream adjacent processing unit (10).

12. The waste sludge pretreatment system according to claim 11, characterized in that, The outlet flange (131) of the final stage processing unit (10) is configured to connect to a mechanical dewatering system to transport the pretreated residual sludge to the mechanical dewatering system for dewatering.

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