A sequencing batch municipal sludge solidification and reduction method and equipment

Abstract

This invention proposes a batch processing method and equipment for solidifying and reducing municipal sludge, relating to the field of sludge treatment technology. The batch processing equipment includes a homogenization pretreatment station, a transfer pump, a turning and curing station, a solidifying agent preparation and supply station, and a discharge station. The homogenization pretreatment station is used to thoroughly mix the dewatered sludge from the wastewater treatment plant with an aqueous solidifying agent to obtain a mixture. The transfer pump connects the homogenization pretreatment station and the turning and curing station via hoses. The turning and curing station is equipped with multiple sludge tanks, an aeration unit, and a mixing assembly. The aeration unit is installed on the mixing assembly. The mixing assembly is used to sequentially distribute the mixture delivered by the transfer pump to multiple sludge tanks and periodically stir and turn the mixture within the sludge tanks. The discharge station is located on the side of the sludge tanks. This equipment can reduce the moisture content of sludge by 50%–70% and reduce its weight by 40%–60%, without increasing costs.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and in particular to a sequencing batch process for solidification and reduction of municipal sludge. Background Technology

[0002] Sludge treatment refers to the process of solidifying and molding municipal sludge, which has a high water content and complex composition after dewatering by centrifuges, screw presses, or belt filter presses at wastewater treatment plants, into a solid material with low water content and high strength. This material is then suitable for subsequent landfilling, resource utilization, or incineration, thus avoiding secondary pollution. In my country, sludge is mostly treated using simple stockpiling methods, which have long solidification times and easily cause secondary pollution. Some sludge is transported to landfills, but due to its high water content and strong rheological properties, the landfill surface easily forms swamps, preventing compaction and affecting the normal operation of the landfill. Therefore, in-situ solidification treatment methods have been proposed for sludge treatment.

[0003] Existing municipal sludge solidification and molding devices use only cement and lime, or a mixture of fly ash, gypsum, and other raw materials. The solidified soil exhibits defects such as high alkalinity, high admixture content, cracking, and significant brittleness. Furthermore, the use of a single excavator for mixing during the treatment process results in poor mixing of the agents and materials, leading to agent waste and uneven treatment effects. The treated sludge has a high water content, poor volume reduction, and high cost. Summary of the Invention

[0004] In view of this, the present invention proposes a batch-type municipal sludge solidification and reduction equipment and method to solve the technical problems mentioned in the background art, such as the high water content of the sludge after treatment by the existing municipal sludge solidification and molding device, the poor reduction effect, and the high cost.

[0005] The technical solution of this invention is implemented as follows: In a first aspect, the present invention provides a batch processing municipal sludge solidification and reduction equipment, comprising a homogenization pretreatment station, a conveying pump, a turning and curing station, a solidifying agent preparation and supply station, and a discharge station, wherein: The homogenization pretreatment station is used to fully mix the sludge after dewatering treatment at the wastewater treatment plant with the solidifying agent to obtain a mixture. The delivery pump is connected to the homogenization pretreatment station and the turning and curing station via a hose, and is used to pump the mixture to the turning and curing station; The turning and curing station is equipped with multiple sludge tanks, aeration units, and mixing components. The multiple sludge tanks are sequentially filled with a mixture. The aeration units are installed on the mixing components and are used to aerate the mixture in the sludge tanks while adding solidifying powder or biomass powder to the mixture. The mixing components are used to sequentially distribute the mixture pumped by the conveying pump to the multiple sludge tanks, and are also used to periodically stir and turn the mixture in the sludge tanks. The curing agent preparation and supply station is used to provide the curing agent aqueous solution to the homogeneous mixing pretreatment station and to provide the curing powder or biomass powder to the aeration unit; The unloading station is located on the side of the sludge tank. After the required solidification time is reached, the sludge tank is transferred to the unloading station for unloading.

[0006] In some alternative embodiments, preferably, the homogenization pretreatment station is provided with a first conveyor and a homogenizer; The first conveyor is used to transport the sludge after dewatering treatment at the sewage treatment plant to the homogenizer; The curing agent preparation and supply station is equipped with a liquid raw material feeding machine, a curing agent feeding machine, and a curing agent liquid preparation machine. The liquid raw material feeding machine and the curing agent feeding machine respectively feed the liquid raw material and the curing agent into the curing agent liquid preparation machine. The curing agent preparation machine is connected to the homogenizer and is used to feed the prepared curing agent liquid into the homogenizer. The homogenizer is used to mix sludge and solidifying agent water evenly to obtain a mixture.

[0007] In some alternative embodiments, preferably, the sludge tank includes a first tank, a second tank, and a switching mechanism, wherein the top surfaces of the first and second tanks are open and their adjacent sides are fully open to form a complete sludge tank; the switching mechanism is used to connect the first and second tanks and drive the first and second tanks to open and close from the bottom.

[0008] In some optional embodiments, preferably, the switching mechanism includes a lifting cylinder, a guide member, a driving member, and a first sliding column and a second sliding column. The lifting cylinder is connected to the driving member. The guide member is hinged to the first housing and the second housing respectively. The driving member is provided with a guide groove, a first sliding groove, and a second sliding groove. The guide groove is arranged vertically, and the guide member is slidably installed in the guide groove. The first sliding groove and the second sliding groove are symmetrically arranged about the guide groove. The first sliding groove is inclined, and the vertical distance from its lower end to the guide groove is greater than the vertical distance from its upper end to the guide groove. The first sliding column is fixedly installed on the first housing and slidably installed in the first sliding groove. The second sliding column is fixedly installed on the second housing and slidably installed in the second sliding groove.

[0009] In some alternative embodiments, preferably, the unloading station is provided with a collection pit and a second conveyor, the lifting cylinders are arranged on both sides of the collection pit, the collection pit is used to collect and store the solidified sludge that falls out of the sludge box, and one end of the second conveyor is located below the collection pit to transport the sludge to the truck.

[0010] In some alternative embodiments, preferably, the second conveyor includes a screw feeder and a belt conveyor, the collection pit is provided with a discharge port, the screw feeder is installed on the collection pit and located at the discharge port; one end of the belt conveyor is below the screw feeder.

[0011] In some alternative implementations, preferably, the bottom cross-section is V-shaped when the first and second housings are closed.

[0012] In some optional embodiments, preferably, the mixing assembly includes a frame, a telescopic arm, a luffing mechanism, and a mixing head. The frame has wheels with locking mechanisms at its bottom, a hanging hole on the sludge tank, and a hook on the frame for matching the hanging hole. One end of the telescopic arm is mounted on the frame, and the other end is connected to the luffing mechanism. The luffing mechanism is slidably mounted on the frame in a horizontal direction. The mixing head is mounted on the luffing mechanism and is used to move vertically under the drive of the luffing mechanism. The aeration unit includes an air pipe and an air compressor. The air pipe is mounted on the mixing head and connected to the air compressor. The mixing head has a sludge distribution pipe and a dosing port. The sludge distribution pipe is connected to a delivery pump, and the dosing port is mounted at the bottom end of the air pipe and connected to the solidifying agent dosing machine.

[0013] In some alternative implementations, preferably, the delivery pump is a plunger pump.

[0014] In a second aspect, the present invention provides a batch solidification and reduction method for municipal sludge, using the batch solidification and reduction equipment described in the first aspect, wherein the batch solidification and reduction method for municipal sludge includes: The curing agent preparation and supply station provides the curing agent aqueous solution to the homogeneous mixing pretreatment station; The sludge dewatered from the wastewater treatment plant is mixed with a solidifying agent in the homogenization pretreatment station to obtain a mixture. The mixture is pumped from the homogenization and pretreatment station to the mixing assembly at the turning and curing station by the conveying pump. The mixing assembly then sequentially distributes the mixture from the conveying pump to multiple sludge tanks. The solidifying agent preparation and supply station provides solidifying powder or biomass powder to the aeration unit. The aeration unit aerates the mixture in the sludge tank while adding solidifying powder or biomass powder to the mixture. The stirring component periodically stirs and turns the mixture in the sludge tank. After the required solidification time is reached, the sludge tank is transferred to the unloading station for unloading.

[0015] The batch-type municipal sludge solidification and reduction method and equipment of the present invention have the following advantages over the prior art: (1) The sludge after dewatering treatment at the wastewater treatment plant is mixed with a solidifying agent at the homogenization pretreatment station to obtain a mixture; the pump pumps the mixture from the homogenization pretreatment station to the mixing component at the turning and curing station, and the mixing component distributes the mixture from the pump pump to multiple sludge tanks in turn; the solidifying agent preparation and supply station provides solidifying powder or biomass powder to the aeration unit, and the aeration unit aerates the mixture in the sludge tank while adding solidifying powder or biomass powder to the mixture; the mixing component periodically stirs and turns the mixture in the sludge tank; after the solidification time requirement is met, the sludge tank is transferred to the unloading station for unloading; after the above process of the sequential batch municipal sludge solidification and reduction equipment, the water content of the sludge can be reduced by 50%~70%, the weight can be reduced by 40%~60%, and the cost will not increase. (2) The lifting cylinder pushes the drive component to move upward, the first sliding column slides along the first sliding groove; the second sliding column slides along the second sliding groove, thereby causing the bottom of the first box and the second box to move to both sides, realizing the opening of the sludge box. Conversely, it can realize the closing of the sludge box. The operation is simple and convenient, and it is easy to unload. (3) After the first box and the second box are closed, the bottom cross section is V-shaped, so that when the first box and the second box are opened, the sludge can be better separated from the sludge box, and can fall quickly and continuously under the action of gravity, thereby improving the unloading efficiency. (4) The telescopic arm drives the variable amplitude mechanism to slide horizontally on the frame; the variable amplitude mechanism drives the stirring head to move vertically, thereby turning over the mixture in the entire sludge tank. At the same time, the solidifying agent is added through the dosing port on the stirring head, so that the solidifying agent and the mixture are mixed more evenly, thereby improving the solidification effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the batch-type municipal sludge solidification and reduction equipment in an embodiment of the present invention. Figure 2 This is a front view of the batch-type municipal sludge solidification and reduction equipment in an embodiment of the present invention. Figure 3 This is a schematic diagram of the stirring assembly in an embodiment of the present invention; Figure 4 This is a schematic diagram of the unloading station in an embodiment of the present invention; Figure 5 This is a schematic diagram of the sludge tank in an embodiment of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of part A in the middle; Figure 7 This is a schematic diagram illustrating the working principle of the batch-type municipal sludge solidification and reduction equipment in an embodiment of the present invention. Figure 8 This is a schematic diagram showing the changes in moisture content and organic matter during sludge solidification in the comparative example of this invention. Figure 9 This is a schematic diagram showing the relationship between moisture content and theoretical weight during the curing period of the experimental group (Area A) in the comparative example of this invention; Figure 10 (a) The weight reduction effect of solidified sludge after 3 days, 5 days and 7 days in the experimental examples of the present invention. Figure 10 (b) is a graph showing the relationship between the weight of solidified sludge and the weight loss rate in the experimental examples of the present invention; Figure 11 (a) represents the moisture content of the solidified sludge after 3 days, 5 days, and 7 days in the experimental examples of this invention. Figure 11 (b) is a graph showing the relationship between the weight and moisture content of the solidified sludge in the experimental examples of this invention; Figure 12 This is a graph showing the relationship between the weight reduction effect of different dosages of G3-1 solidified sludge and the dosage in the experimental examples of this invention; Figure 13 This is a graph showing the relationship between the moisture content of solidified sludge of G3-1 and the dosage in different dosages in the experimental examples of this invention; Figure 14 This is a graph showing the relationship between the organic matter content of solidified sludge of G3-1 and the dosage in different dosages in the experimental examples of this invention; Figure 15 This is a schematic flowchart of the batch solidification and reduction method for municipal sludge in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 100 - homogenization pretreatment station, 200 - delivery pump, 300 - turning and curing station, 400 - curing agent preparation and supply station, 500 - unloading station; 110 - First conveyor, 120 - Homogenizer, 130 - Aqueous agent dosing machine, 131 - Aqueous agent raw material additive machine, 132 - Aqueous agent preparation unit; 310-Sludge tank, 320-Mixing assembly, 321-Frame, 3211-Walking wheel, 322-Telescopic arm, 323-Amplitude mechanism, 324-Mixing head, 325-Dosing port, 326-Sludge distribution pipe, 330-Aeration unit, 331-Air pipe; 410 - Aqueous raw material dispensing machine; 420 - Curing agent dispensing machine; 430 - Curing agent aqueous preparation machine; 311-First housing, 312-Second housing, 313-Switch mechanism, 3131-Lifting cylinder, 3132-Guide component, 31321-Hanging hole, 3133-Drive component, 31331-Guide groove, 31332-First slide groove, 31333-Second slide groove, 3134-First slide column, 3135-Second slide column; 314-Cassette wheel; 510 - Collection pit, 511 - Discharge port, 520 - Second conveyor, 521 - Screw feeder, 522 - Belt conveyor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0025] The technical solution will now be explained in detail: Reference Figures 1-11 As shown, a first aspect of the present invention provides a batch processing municipal sludge solidification and reduction equipment, comprising a homogenization pretreatment station 100, a conveying pump 200, a turning and curing station 300, a solidifying agent preparation and supply station 400, and a discharge station 500, wherein: The homogenization pretreatment station 100 is used to mix the sludge after dewatering treatment at the sewage treatment plant with an aqueous agent to obtain a mixture. Specifically, the homogenization pretreatment station 100 is equipped with a first conveyor 110 and a homogenizer 120; the first conveyor 110 is used to transport the sludge after dewatering treatment in the sewage treatment plant to the homogenizer 120; the homogenizer 120 is used to mix the sludge and the water agent evenly to obtain a mixture; the first conveyor 110 can be a screw conveyor; The delivery pump 200 is connected to the homogenization pretreatment station 100 and the turning and curing station 300 via a hose, and is used to pump the mixture to the turning and curing station 300. The turning and curing station 300 is equipped with multiple sludge tanks 310, an aeration unit 330, and a mixing assembly 320. The multiple sludge tanks 310 are used to sequentially fill the mixture. The aeration unit 330 is installed on the mixing assembly 320 and is used to aerate the mixture in the sludge tanks 310 while adding solidifying powder or biomass powder to the mixture. The mixing assembly 320 is used to sequentially distribute the mixture delivered by the conveying pump 200 to the multiple sludge tanks 310, and is also used to periodically stir and turn the mixture in the sludge tanks 310, for example, once every 8 hours. This can be done by transferring the sludge tanks 310 to the mixing station 400 and having the mixing assembly 420 stir them, or by moving the mixing assembly 420 above the sludge tanks 310 to stir them. In this embodiment, based on the daily sludge processing volume, for example, five sludge tanks 310 can be set up. The pre-treated mixture is delivered to one of the sludge tanks 310 every day. Starting from the fifth day, it is possible to transport the bulk soil material with a significantly reduced moisture content after the sludge in one sludge tank 310 has been solidified every day, thus achieving continuous operation. The curing agent preparation and supply station 400 is used to provide curing agent aqueous solution to the homogeneous mixing pretreatment station 100 and to provide curing powder or biomass powder to the aeration unit 330; Specifically, the curing agent preparation and supply station 400 is equipped with a liquid raw material dosing machine 410, a curing agent dosing machine 420, and a curing agent liquid preparation machine 430. The liquid raw material dosing machine 410 and the curing agent dosing machine 420 respectively supply liquid raw materials and curing agents to the curing agent liquid preparation machine 430. The curing agent preparation machine is connected to the homogenizer and is used to add the prepared curing agent liquid to the homogenizer. The curing agent dosing machine 420 is also used to provide curing powder or biomass powder to the aeration unit 330. The unloading station 500 is located on the side of the sludge tank 310. After the required curing time is reached, the sludge tank 310 is transferred to the unloading station 500 for unloading. The curing time requirement can be set according to the actual curing requirements. For example, in this embodiment, the sludge tank 310 can be placed in the sludge tank 310 for 5 days before being transferred to the unloading station 500 for unloading.

[0026] The sequential batch solidification and reduction equipment for municipal sludge proposed in this embodiment mixes the dewatered sludge from the wastewater treatment plant with a solidifying agent in the homogenization pretreatment station 100 to obtain a mixture. A transfer pump 200 pumps the mixture from the homogenization pretreatment station 100 to a mixing component 320 in the turning and curing station 300. The mixing component 320 sequentially distributes the mixture from the transfer pump 200 to multiple sludge tanks 310. The solidifying agent is then supplied to the aeration unit 330 through the solidifying agent preparation and supply station 400. The aeration unit 330 aerates the mixture in the sludge tank 310 while adding solidifying powder or biomass powder to the mixture. The stirring component 320 periodically stirs and turns the mixture in the sludge tank 310. After the solidification time requirement is met, the sludge tank 310 is transferred to the unloading station 500 for unloading. After the above process of the sequential batch municipal sludge solidification and reduction equipment, the water content of the sludge can be reduced by 50% to 70%, the weight can be reduced by 40% to 60%, and the cost will not increase.

[0027] In some optional embodiments, the sludge tank 310 includes a first tank body 311, a second tank body 312, and a switching mechanism 313. The first tank body 311 and the second tank body 312 are mirror images of each other and can be assembled into a complete sludge tank 310. The switching mechanism 313 is used to connect the first tank body 311 and the second tank body 312, and drives the first tank body 311 and the second tank body 312 to open and close from the bottom. The sludge tank 310 is equipped with casters 314 at the bottom for easy towing and movement.

[0028] In some optional embodiments, the switching mechanism 313 includes a lifting cylinder 3131, a guide member 3132, a driving member 3133, a first sliding column 3134, and a second sliding column 3135. The lifting cylinder 3131 is connected to the driving member 3133. The guide member 3132 is hinged to the first housing 311 and the second housing 312 respectively. The driving member 3133 is provided with a guide groove 31331, a first sliding groove 31332, and a second sliding groove 31333. The guide groove 31331 is arranged vertically, and the guide member 3132 is slidably mounted on the first housing 311 and the second housing 312. In the guide groove 31331; the first sliding groove 31332 and the second sliding groove 31333 are symmetrically arranged about the guide groove 31331, the first sliding groove 31332 is inclined and the vertical distance from its lower end to the guide groove 31331 is greater than the vertical distance from its upper end to the guide groove 31331; the first sliding column 3134 is fixedly installed on the first housing 311 and slidably installed in the first sliding groove 31332; the second sliding column 3135 is fixedly installed on the second housing 312 and slidably installed in the second sliding groove 31333.

[0029] In this embodiment, the lifting cylinder 3131 pushes the driving member 3133 upward, and the first sliding column 3134 slides along the first sliding groove 31332; the second sliding column 3135 slides along the second sliding groove 31333, thereby causing the bottoms of the first box 311 and the second box 312 to move to both sides, thus opening the sludge box 310; conversely, the lifting cylinder 3131 descends, and the driving member 3133 moves downward under the action of gravity, causing the bottoms of the first box 311 and the second box 312 to move towards the middle, thus closing the sludge box 310. The operation is simple and convenient, and it is easy to unload.

[0030] In some optional embodiments, the unloading station 500 is provided with a collection pit 510 and a second conveyor 520. The lifting cylinder 3131 is disposed on both sides of the collection pit 510. The collection pit 510 is used to collect and store the solidified sludge that falls out of the sludge box 310. One end of the second conveyor 520 is located below the collection pit 510 to transport the sludge to the truck.

[0031] In some optional embodiments, the second conveyor 520 includes a screw feeder 521 and a belt conveyor 522. The collection pit 510 is provided with a discharge port 511. The screw feeder 521 is installed on the collection pit 510 and located at the discharge port 511. One end of the belt conveyor 522 is below the screw feeder 521. The screw feeder 521 feeds the solidified sludge from the discharge port 511 onto the belt conveyor 522, which then transports the sludge to a truck at its end for removal.

[0032] In some optional embodiments, when the first box 311 and the second box 312 are closed, the bottom cross-section is V-shaped. This V-shaped design allows the sludge to detach effectively from the sludge box 310 when the first box 311 and the second box 312 are opened, enabling it to fall quickly and continuously under gravity, thereby improving unloading efficiency.

[0033] In some optional embodiments, the stirring assembly 420 includes a frame 321, a telescopic arm 322, a variable amplitude mechanism 323, and a stirring head 324. The frame 321 has wheels 3211 with locking mechanisms at its bottom. The sludge tank 310 has hanging holes 31321, and the frame 321 has hooks for matching the hanging holes 31321. One end of the telescopic arm 322 is mounted on the frame 321, and the other end is connected to the variable amplitude mechanism 323. The variable amplitude mechanism 323 is slidably mounted on the frame 321 in a horizontal direction. 1. The stirring head 324 is mounted on the amplitude changing mechanism 323 and is used to move vertically under the drive of the amplitude changing mechanism 323; the aeration unit 330 includes an air pipe 331 and an air compressor, the air pipe 331 is mounted on the stirring head 324 and connected to the air compressor; the stirring head 324 is provided with a sludge distribution pipe 326 and a dosing port 325, the sludge distribution pipe 326 is connected to the conveying pump 200 through a hose, and the dosing port 326 is mounted at the bottom end of the air pipe 331 and connected to the solidifying agent dosing machine 420.

[0034] In this embodiment, the telescopic arm 322 drives the amplitude-changing mechanism 323 to slide horizontally on the frame 321; the amplitude-changing mechanism 323 drives the stirring head 324 to move vertically, thereby agitating the mixture in the entire sludge tank 310. Simultaneously, a curing agent is added through the dosing port 325 on the stirring head 324, resulting in a more uniform mixing of the curing agent and the mixture, thus improving the curing effect. The frame 321 has wheels 3211 with locking mechanisms at its bottom, allowing the entire stirring assembly 420 to move and turn flexibly on the ground. The hooks on the frame 321 can be attached to the hanging holes 31321 on the sludge tank 310, allowing the sludge tank 310 to be dragged and moved.

[0035] In some optional embodiments, the delivery pump 200 can be a plunger pump. Preferably, the delivery pump 200 is a high-pressure plunger pump. The operating pressure of a high-pressure plunger pump is generally between 1 MPa and 10 MPa. It is a positive displacement pump, which uses the periodic change in volume within its working chamber to achieve the purpose of material transport. The mechanical energy of the prime mover is directly converted into the pressure energy of the transported material by the pump. The pump's capacity depends only on the change in the working chamber volume and the number of changes per unit time, and theoretically is independent of the discharge pressure. Of course, in this embodiment, the delivery pump 200 can also be a general concrete pump, which can meet the pressure requirements.

[0036] The curing agent mentioned in this embodiment underwent the following experiments: Comparative example: Experimental preparation (1) Municipal sludge: The municipal sludge used in the verification test was all sludge from a sewage treatment plant. Its sewage treatment process is AAO-A+MBR, and the daily treatment volume of domestic sewage is 25,000 cubic meters, generating about 20 cubic meters of sludge per day. The laboratory test showed that the sludge had a water content of 82% and an organic matter content of 50%.

[0037] (2) Sludge volume: approximately 14,000 kg; (3) Verification test duration: 7 days; (4) Verification site: 30-40 m 2 Access roads must be provided in the surrounding area; (5) Machinery and equipment: sludge conveying facilities, chemical conveying facilities, mechanical mixers, excavators; (6) Testing and inspection equipment: labeling, sludge sampler, sealed bag, measuring tape, marker pen, sample refrigerator, thermometer and hygrometer, drying oven, balance, muffle furnace, flame atomic absorption spectrometer, ultraviolet-visible spectrophotometer, inductively coupled plasma atomic emission spectrometer, inductively coupled plasma mass spectrometer, portable odor detector, portable sludge moisture content meter, portable PID detector; (7) Safety protective equipment: nitrile gloves, activated carbon masks, laboratory clothing, warning signs, and warning tapes.

[0038] Experimental process (1) Test site: A vacant lot in the sewage treatment plant was divided into two 4m×4m grids, each with an area of ​​16 m2. In order to prevent secondary pollution, our unit laid HDPE membrane and geotextile in the test area and isolated the test area and control area with warning tape. (2) Experimental Procedure: Approximately 7200 kg of sludge was weighed and transported into two 4m×4m grids using a loader. An experimental group (A area) and a control group (B area) were established. The experimental group received 11% of the self-developed high-efficiency new G3 curing agent by weight, while the control group received no curing agent. The G3 curing agent was evenly spread on the surface of the sludge pile using an excavator, and then mixed until the curing agent and sludge were uniformly mixed. The sludge was then cured under natural environmental conditions. Temperature and humidity meters were placed diagonally across the experimental area. Temperature and humidity records were compiled for the curing area during three time periods daily: 8:00-9:00, 12:00-13:00, and 18:00-19:00. (3) Maintenance requirements: During the maintenance period, the test area shall be turned over once in the morning and once in the afternoon, and the test area shall be turned over clockwise. During the maintenance period, the odor concentration in the test area shall be measured at the diagonal points of the maintenance area at 8:00-9:00, 12:00-13:00 and 18:00-19:00 every day. The odor concentration shall also be measured at the control points at the upwind and downwind points of the test area and recorded. If it rains, the entire test area shall be covered with tarpaulin and rainwater shall be diverted. (4) Sampling requirements: Samples were taken from the control group and the experimental group every day. Each sample was taken from 4 sampling points in each grid, with 500g taken from each point, for a total of 2000g to form a mixed sample. The sampling time points were 12h, 24h, 36h, 48h, 60h, 72h, 96h, 120h, 144h and 168h after the mixing was completed. (5) Sample transportation and testing: After the various samples collected on the same day are labeled, they are stored in the sample refrigerator according to their categories and transported to the laboratory within 24 hours. The on-site sampling personnel need to complete the handover with the testing personnel according to the sample list. After receiving the samples, the laboratory will carry out routine monitoring and characteristic monitoring as required. (6) Acceptance evaluation: Based on the results of indoor small-scale tests, the final sludge moisture content should be reduced by 50% or more to meet the target requirements.

[0039] The experimental data obtained are as follows: During on-site curing, the temperature was between 30 and 50°C, and the humidity was between 35% and 72% RH. During curing without turning over the soil, the odor concentration was between 30 and 60 oz. During curing with turning over the soil, the odor concentration was between 60 and 300 oz. On-site monitoring records are shown in Table 1 below. Table 1

[0040]

[0041] Changes in moisture content and organic matter during sludge solidification, such as Figure 8 As shown, 11% curing agent was added to area A (experimental group), while no curing agent was added to area B (control group). Both were cured under the same conditions. Specific test data are shown in Table 2.

[0042] Table 2

[0043] Depend on Figure 8 It can be seen that after adding the solidifying agent, the sludge moisture content decreased from 81.93% to 68.73%, while the organic matter content decreased from 46.51% to 32.97%. In the period of 72-84 hours, the sludge moisture content decreased rapidly, reaching 56.15%, and then decreased slowly, reaching 49.75% on the 7th day. In contrast, the moisture content of the control group (original sludge) decreased from 82.93% to 79.37% after the 7th day. The organic matter content tended to stabilize after adding the solidifying agent, fluctuating around 31%. The organic matter content of the control group (original sludge) did not change significantly. The instability of the organic matter content may be caused by the heterogeneity of the original sludge.

[0044] The weight changes of sludge after solidification are shown in Table 3. After 7 days of curing, the weight of the experimental group (Area A) decreased from 7260 kg to 4280 kg, a reduction of 2980 kg, with a weight reduction rate of 41.05%. After 7 days of curing, the weight of the control group (Area B) decreased from 7210 kg to 6120 kg, a reduction of 1090 kg, with a weight reduction rate of 15.12%.

[0045] Table 3

[0046] To further determine the relationship between curing time and weight in the experimental group (Area A), the theoretical weight was calculated based on the moisture content as follows: Figure 9 The specific weight and weight reduction rate are shown in Table 4.

[0047] Table 4

[0048] After 7 days of curing, the actual weight loss rate of the sludge was 41.05%, while the theoretical weight loss rate was 42.15%, a difference of 1.1%. Therefore, it is believed that the theoretical weight calculated based on the moisture content has certain reference value.

[0049] Experimental conclusions After 7 days of curing, the sludge moisture content in the experimental group decreased from 81.93% to 49.75%, while the sludge moisture content in the control group decreased from 82.93% to 79.37%. The organic matter content in the experimental group decreased from 46.51% to 32.97%, while the organic matter content in the control group remained between 46% and 50%. The weight loss rate in the experimental group was 41.05%, while the weight loss rate in the control group was 15.12%.

[0050] Experimental Example Experiments were conducted on the curing agent under laboratory conditions: Experimental conditions: 200g sludge; 7% solidifying agent; temperature 26-28℃; humidity 62%-72%. Experimental method: Weigh 200g of municipal sludge from Gao'an, Jiangxi (moisture content 83%, organic matter 53.29%) into a beaker, add 7% of four different curing agents (G3-1 and G3-2 are self-developed high-efficiency curing agents with the same formula but different manufacturers), stir thoroughly, and place in a small dish. Cure at a temperature of 26~28℃ and a humidity of 62~72%. After curing, measure the weight loss rate and moisture content by gravimetric method, and measure the organic matter by ignition method.

[0051] The experimental data obtained are as follows: The moisture content and organic matter data of the solidified sludge are shown in Table 5 below: Table 5

[0052] The weight reduction effect of solidified sludge by different solidifying agents is as follows: Figure 10 As shown, Figure 10 (a) Weight reduction effect of solidified sludge after 3 days, 5 days and 7 days. Figure 10 (b) is a graph showing the relationship between the weight of solidified sludge and its weight loss rate; the moisture content of solidified sludge with different solidifying agents is as follows: Figure 11 As shown, Figure 11 (a) Moisture content of solidified sludge after 3 days, 5 days, and 7 days. Figure 11 (b) is a graph showing the relationship between the weight and moisture content of solidified sludge. Figure 10 It can be seen that after 3 days of sludge solidification, the self-developed high-efficiency solidifying agents (G3-1 and G3-2) showed the best solidification effect, with the weight decreasing from 214g (200g sludge and 14g solidifying agent) to 62.3g and 74.6g, respectively, with weight reduction rates of 70.89% and 65.14%, and moisture content decreasing from 83% to 31.91% and 50.2%. In contrast, the weight reduction rates of the solidifying agents from Henan and Yichang were 48.18% and 48.56%, respectively, and the moisture contents were 71.05% and 51.66%, respectively.

[0053] To further verify the effectiveness of sludge solidification, we conducted a module comparison experiment. 1600g of municipal sludge from Gao'an, Jiangxi Province was weighed and divided into a control group and an experimental group. The control group received no solidification agent, while the experimental groups received 10% and 15% G3 solidification agent, respectively. The sludge was demolded one day after solidification. The obtained moisture content data are shown in Table 6 below. Table 6

[0054] The results of the modular experiment show that the sludge moisture content does not change significantly without the addition of solidifying agent. After adding solidifying agent, the sludge moisture content dropped to 46.06% on the seventh day. Compared with the small-scale experiment, the reduction effect of moisture content is about 30%. In addition, the change of organic matter is the same as that in the small-scale experiment. After adding solidifying agent G3, the organic matter content only decreased on the first day and then tended to stabilize. The organic matter content of the original sludge did not change.

[0055] The data on the change in organic matter content of the solidified sludge are shown in Table 7 below: Table 7

[0056] The organic matter content of the original sludge was 52.39%. After 3 days of solidification, the organic matter content of the sludge showed a decreasing trend. The addition of G3-1 and G3-2 solidifying agents reduced the organic matter content of the sludge from 52.39% to 34.56% and 34.80%, respectively. After 5 days of curing, the organic matter content remained basically unchanged. After 7 days of curing, the organic matter content increased slightly, reaching 36.47% and 36.99%, respectively. The changes in organic matter content of the sludge after the addition of solidifying agents in Henan and Yichang showed the same trend as those of the self-developed high-efficiency solidifying agent, and the organic matter content was close. However, after lime solidification of the sludge, the organic matter content dropped to 31.25%.

[0057] Based on the experimental results of different dosages, the change in organic matter content occurred on the first day, and the organic matter content remained basically unchanged during the subsequent reaction process. In addition, the moisture content decreased to some extent during the solidification process of the original mud, but the organic matter content did not decrease. Therefore, it is speculated that the change in organic matter content is due to the dissolution effect after the addition of solidifying agent.

[0058] The effect of different dosages on the curing effect was verified through experiments: Experimental conditions: sludge mass 300g; solidifying agent: G3-1; temperature 26~30℃; humidity 62%~72%; The experimental method is the same as above; See the graph showing the relationship between the weight reduction effect, moisture content, and organic matter content of solidified sludge with different dosages of G3-1. Figure 12 , 13 14. The dosage of solidifying agent G3-1 increased from 7% to 10%. With the increase of curing time, the weight loss rate was between 72% and 78%, and the moisture content decreased to between 5% and 8%. The higher the dosage, the lower the weight loss rate, the lower the moisture content, and the faster the dewatering rate. After 3 days of curing, the weight loss rate and moisture content of the sludge basically stabilized. Similarly, the higher the dosage of G3-1, the lower the organic matter content. Overall, the organic matter dropped sharply to below 40% on the first day, decreased slowly on the second and third days, showed an upward trend on the fourth day, and then stabilized.

[0059] Experimental conclusion: After comparing four different types of curing agents, namely G3, Henan, Yichang and lime, the study found that the self-developed G3 curing agent had the best effect.

[0060] Based on the same concept, a second aspect of the present invention, combined with... Figure 15 As shown, a batch solidification and reduction method for municipal sludge is provided, using the batch solidification and reduction equipment described in the first aspect. The batch solidification and reduction method for municipal sludge includes: Step S1: The curing agent liquid is supplied to the homogeneous mixing pretreatment station 100 through the curing agent preparation and supply station 400; Step S2: The sludge dewatered from the wastewater treatment plant is mixed with an aqueous agent through the homogenization pretreatment station 100 to obtain a mixture; Step S3: The mixture is pumped from the homogenization pretreatment station 100 to the mixing component 320 of the turning and curing station 300 by the conveying pump 200. The mixing component 320 sequentially distributes the mixture from the conveying pump to multiple sludge tanks 310. Step S4: The solidifying agent preparation and supply station 400 provides solidifying powder or biomass powder to the aeration unit 330. The aeration unit 330 aerates the mixture in the sludge tank 310 and adds solidifying powder or biomass powder to the mixture. The stirring component 320 periodically stirs and turns the mixture in the sludge tank 310. Step S5: After the required solidification time is reached, the sludge tank 310 is transferred to the unloading station 500 for unloading. Step S6: Repeat steps S1 to S5 above to achieve continuous operation of municipal sludge solidification and reduction.

[0061] The sequential batch solidification and weight reduction method for municipal sludge proposed in this embodiment can reduce the water content of municipal sludge by 50% to 70% and the weight by 40% to 60%, without increasing the cost, thus meeting environmental protection and energy conservation requirements.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A batch processing municipal sludge solidification and reduction equipment, characterized in that, It includes a homogenization pretreatment station, a conveying pump, a turning and curing station, a curing agent preparation and supply station, and a unloading station, wherein: The homogenization pretreatment station is used to fully mix the sludge after dewatering treatment at the wastewater treatment plant with the solidifying agent to obtain a mixture. The delivery pump is connected to the homogenization pretreatment station and the turning and curing station via a hose, and is used to pump the mixture to the turning and curing station; The turning and curing station is equipped with multiple sludge tanks, aeration units, and mixing components. The multiple sludge tanks are sequentially filled with a mixture. The aeration units are installed on the mixing components and are used to aerate the mixture in the sludge tanks while adding solidifying powder or biomass powder to the mixture. The mixing components are used to sequentially distribute the mixture pumped by the conveying pump to the multiple sludge tanks, and are also used to periodically stir and turn the mixture in the sludge tanks. The curing agent preparation and supply station is used to provide the curing agent aqueous solution to the homogeneous mixing pretreatment station and to provide the curing powder or biomass powder to the aeration unit; The unloading station is located on the side of the sludge tank. After the required solidification time is reached, the sludge tank is transferred to the unloading station for unloading.

2. The batch processing municipal sludge solidification and reduction equipment as described in claim 1, characterized in that, The homogenization pretreatment station is equipped with a first conveyor and a homogenizer; The first conveyor is used to transport the sludge after dewatering treatment at the sewage treatment plant to the homogenizer; The curing agent preparation and supply station is equipped with a liquid raw material feeding machine, a curing agent feeding machine, and a curing agent liquid preparation machine. The liquid raw material feeding machine and the curing agent feeding machine respectively feed the liquid raw material and the curing agent into the curing agent liquid preparation machine. The curing agent preparation machine is connected to the homogenizer and is used to feed the prepared curing agent liquid into the homogenizer. The homogenizer is used to mix sludge and solidifying agent water evenly to obtain a mixture.

3. The batch processing municipal sludge solidification and reduction equipment as described in claim 1, characterized in that, The sludge tank includes a first tank, a second tank, and a switching mechanism. The first tank and the second tank are mirror images of each other. The switching mechanism is used to connect the first tank and the second tank and drive the first tank and the second tank to open and close from the bottom.

4. The batch processing municipal sludge solidification and reduction equipment as described in claim 3, characterized in that, The switching mechanism includes a lifting cylinder, a guide member, a driving member, a first sliding column, and a second sliding column. The lifting cylinder is connected to the driving member. The guide member is hinged to the first housing and the second housing respectively. The driving member has a guide groove, a first sliding groove, and a second sliding groove. The guide groove is arranged vertically, and the guide member is slidably installed in the guide groove. The first sliding groove and the second sliding groove are symmetrically arranged about the guide groove. The first sliding groove is inclined, and the vertical distance from its lower end to the guide groove is greater than the vertical distance from its upper end to the guide groove. The first sliding column is fixedly installed on the first housing and slidably installed in the first sliding groove. The second sliding column is fixedly installed on the second housing and slidably installed in the second sliding groove.

5. The batch processing municipal sludge solidification and reduction equipment as described in claim 4, characterized in that, The unloading station is equipped with a collection pit and a second conveyor. The lifting cylinders are located on both sides of the collection pit. The collection pit is used to collect and store the solidified sludge that falls out of the sludge box. One end of the second conveyor is located below the collection pit to transport the sludge to the truck.

6. The batch processing municipal sludge solidification and reduction equipment as described in claim 5, characterized in that, The second conveyor includes a screw feeder and a belt conveyor. The collection pit is provided with a discharge port. The screw feeder is installed on the collection pit and located at the discharge port. One end of the belt conveyor is below the screw feeder.

7. The batch processing municipal sludge solidification and reduction equipment as described in claim 3, characterized in that, When the first and second boxes are closed, the bottom cross-section is V-shaped.

8. The batch processing municipal sludge solidification and reduction equipment as described in claim 1, characterized in that, The mixing assembly includes a frame, a telescopic arm, a variable amplitude mechanism, and a mixing head. The frame has wheels with locking mechanisms at its bottom, and the sludge tank has hanging holes. The frame has hooks for matching the hanging holes. One end of the telescopic arm is mounted on the frame, and the other end is connected to the variable amplitude mechanism. The variable amplitude mechanism is slidably mounted on the frame in the horizontal direction. The mixing head is mounted on the variable amplitude mechanism and is used to move in the vertical direction under the drive of the variable amplitude mechanism. The aeration unit includes an air pipe and an air compressor. The air pipe is mounted on the mixing head and connected to the air compressor. The mixing head has a sludge distribution pipe and a dosing port. The sludge distribution pipe is connected to a delivery pump, and the dosing port is mounted at the bottom end of the air pipe and connected to the solidifying agent dosing machine.

9. The batch processing municipal sludge solidification and reduction equipment as described in claim 1, characterized in that, The delivery pump is a plunger pump.

10. A batch solidification and volume reduction method for municipal sludge, characterized in that, Using the batch solidification and reduction equipment for municipal sludge according to any one of claims 1 to 9, the batch solidification and reduction method for municipal sludge includes: The curing agent preparation and supply station provides the curing agent aqueous solution to the homogeneous mixing pretreatment station; The sludge dewatered from the wastewater treatment plant is mixed with a solidifying agent in the homogenization pretreatment station to obtain a mixture. The mixture is pumped from the homogenization and pretreatment station to the mixing assembly at the turning and curing station by the conveying pump. The mixing assembly then sequentially distributes the mixture from the conveying pump to multiple sludge tanks. The solidifying agent preparation and supply station provides solidifying powder or biomass powder to the aeration unit. The aeration unit aerates the mixture in the sludge tank while adding solidifying powder or biomass powder to the mixture. The stirring component periodically stirs and turns the mixture in the sludge tank. After the required solidification time is reached, the sludge tank is transferred to the unloading station for unloading.

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