Integrated automatic device for pretreatment after concentration and weight control of grid slag

Abstract

The utility model relates to the technical field of grid slag treatment, in particular to a filtering concentration and pretreatment strengthening technology of grid slag before acid production through anaerobic fermentation. The utility model provides an integrated automation device for pretreatment after concentration and weight control of grid slag. The integrated automation device comprises an automatic control box, a grid slag feeding port, a feeding and filtering module, a grid slag temporary storage module, a grid slag pretreatment module, a PH value control module and a grid slag guide-out module. The integrated automatic device for pretreatment after concentration and weight control of the grid slag has the advantages that the grid slag is subjected to pretreatment after concentration and weight control of the grid slag and keeping of the stable PH value, the stability of a fermentation acid production system is guaranteed, the grid slag substrate hydrolysis rate is increased, the yield of volatile short-chain fatty acid in the anaerobic fermentation process is increased, and the yield of the volatile short-chain fatty acid in the anaerobic fermentation process is increased. The grid slag organic load control system has the advantages that the grid slag organic load is controlled, meanwhile, the occupied area and the operation cost of equipment are saved, the automation degree is high, and extra labor cost does not need to be input.

Description

Technical Field

[0001] This utility model relates to the field of membrane grid residue treatment technology, specifically to the field of filtration, concentration and pretreatment enhancement technology of grid residue before acid production through anaerobic fermentation. Background Technology

[0002] In the anaerobic fermentation process of acid production, the hydrolysis of screenings is a limiting step in improving fermentation efficiency. Currently, mainstream pretreatment methods such as alkali treatment, acid treatment, ultrasonic treatment, and heat treatment are used to increase the hydrolysis rate of the substrate and thus improve fermentation efficiency. Furthermore, the organic load of the substrate affects the activity of microorganisms and the yield of volatile short-chain fatty acids (VSAs) during fermentation. Generally, a higher organic load yields a higher production of VSAs, but it can lead to incomplete substrate digestion and a large accumulation of VSAs in the fermentation system, ultimately causing system collapse.

[0003] Therefore, for wastewater pretreatment applications, especially fine membrane grid devices based on hydraulic backwashing, to achieve stable and efficient fermentation and acid production from the precipitates, it is necessary to develop a device that can both concentrate the precipitates and control the amount of precipitates produced, while effectively promoting the hydrolysis rate and efficiency of the membrane grid precipitates and reducing pretreatment costs. Utility Model Content

[0004] In view of the problems of slow hydrolysis rate, low efficiency and high cost of pretreatment of membrane grid residue (hereinafter referred to as grid residue) in the prior art, this application provides an integrated automated device for pretreatment of grid residue after concentration and weight control.

[0005] This application provides an integrated automated device for pretreatment of screenings after thickening and weight control, comprising:

[0006] Automatic control box, screenings inlet, feed filter module, screenings temporary storage module, screenings pretreatment module, pH control module, and screenings export module.

[0007] The feeding and filtering module includes a filter screen, a filter screen rotating rod, a first motor, a screenings filtering zone, and a filtered water discharge port. The rotating shaft of the filter screen is fixedly connected to the rotating rod of the filter screen. The rotating rod of the filter screen can drive the filter screen to rotate at a certain preset angle. One end of the rotating rod of the filter screen is connected to the first motor through a gear. The first motor is located on the outside of the device housing.

[0008] The screenings temporary storage module includes a screenings temporary storage area, an arc-shaped rotary valve, an arc-shaped rotary valve rotating rod, and a second motor. The arc-shaped rotary valve is located at the bottom of the screenings temporary storage area. The rotating shaft of the arc-shaped rotary valve is fixedly connected to the rotating rod of the arc-shaped rotary valve. The rotating rod of the arc-shaped rotary valve can drive the arc-shaped rotary valve to rotate at a certain preset angle. One end of the rotating rod of the arc-shaped rotary valve is connected to the second motor through a gear. The second motor is located on the outside of the device housing.

[0009] The screenings pretreatment module includes a pretreatment zone, a load-bearing outer shell for the pretreatment zone, multiple weight detectors, a pH control module, and a stirring module. The multiple weight detectors are installed at the contact points between the pretreatment zone and the load-bearing outer shell. The pH control module includes a pH sensor, a storage tank, a metering pump, and a dosing pipe. The pH sensor is fixed inside the pretreatment zone, and the dosing pipe is fixed at an upper position inside the pretreatment zone. The metering pump is located in the middle section of the dosing pipe connected to the storage tank. The stirring module includes a stirrer and a third motor. The third motor is fixedly connected to the rotating shaft of the stirrer and can drive the stirrer to perform stirring operations. The third motor is located above the outer shell of the device.

[0010] The screenings discharge module includes a discharge port solenoid valve, a discharge conduit, and a screw pump. A screenings discharge port is provided in the lower part of the pretreatment zone cavity. The discharge conduit is connected to the screenings discharge port. The solenoid valve is located at the screenings discharge port, and the screw pump is located in the middle section of the discharge conduit.

[0011] The automatic control box is electrically connected to and can control the operation of the first motor, the second motor, the multiple weight detectors, the pH sensor, the metering pump, the third motor, the discharge port solenoid valve, and the screw pump.

[0012] The rotating rod of the filter screen can rotate at a certain preset angle under the drive of the first motor, which can transfer the screen residue concentrated by the filter screen to the screen residue temporary storage area.

[0013] The screenings temporary storage area is connected to or separated from the pretreatment area through the bow-shaped rotary valve. When the rotating rod of the bow-shaped rotary valve rotates the valve until it closes with the lower structure of the screenings temporary storage area, the screenings temporary storage area and the pretreatment area are separated; otherwise, they are connected.

[0014] Furthermore, the filter screen is a curved filter screen, which is disposed between the feed filtration zone and the screenings temporary storage zone. The curved filter screen includes a filter screen and a screen support. The screen support includes a plurality of first support rods, a plurality of second support rods, a plurality of third support rods, at least two fourth support rods, and a plurality of fifth support rods. The plurality of third support rods are curved arc-shaped.

[0015] The first ends of the plurality of first support rods are respectively fixedly connected to the first ends of the plurality of third support rods. The first ends of the second support rods are respectively fixedly connected to a point between the two ends of the plurality of third support rods. The second ends of the plurality of first support rods are respectively fixedly connected to the second ends of the second support rods. The second ends of the plurality of third support rods are respectively fixedly connected perpendicularly to the shaft of one of the fifth support rods. The first ends of the two fourth support rods are respectively fixedly connected to the second ends of the two outermost third support rods. The second ends of the two fourth support rods are respectively fixedly connected to the second ends of the two outermost first support rods.

[0016] The first ends of the plurality of first support rods, the plurality of second support rods, and the plurality of fourth support rods are all equally spaced and vertically fixed to the body of the filter screen rotating rod. The second ends of the plurality of first support rods, the plurality of second support rods, and the at least two fourth support rods are all fixedly connected to the body of the third support rod. The plurality of fifth support rods are respectively vertically connected to the body of the third support rod, and the plurality of fifth support rods are all parallel to the body of the filter screen rotating rod.

[0017] The first support surface formed by the plurality of first support rods and the second support surface formed by the plurality of second support rods form a first preset angle, and the fourth support surface formed by the at least two fourth support rods and the first support surface form a second preset angle, specifically, the second preset angle is less than 90°.

[0018] The second support surface is covered with a plate to form a sealing surface, the third support curved surface formed by the plurality of third support rods is covered with a screen, and the two ends of the filter screen are covered with a plate to form a sealing surface by the fifth support surface formed by the second support rod, the third support rod and the fourth support rod.

[0019] Furthermore, the side length of the screen mesh laid on the curved surface formed by the plurality of third support rods is 0.35mm.

[0020] Furthermore, the feed filtration module also includes an air backwash nozzle assembly, which is located above the screenings temporary storage area, biased towards the feed inlet. The nozzles of the air backwash nozzle assembly are positioned at a 45° downward angle. A solenoid valve is installed at the main switch of the air backwash nozzle assembly, and the solenoid valve is electrically connected to the automatic control box.

[0021] Furthermore, the feed filtration module also includes a wastewater nozzle assembly, which is located in the overhead space above the pretreatment zone. A solenoid valve is installed at the main switch of the wastewater nozzle assembly, and the solenoid valve is electrically connected to the automatic control box.

[0022] Furthermore, the bottom of the pretreatment zone is a cone, the discharge port solenoid valve is located at the opening at the top of the cone, and the discharge conduit is connected to the opening at the top of the cone.

[0023] Furthermore, the first preset angle formed by the first support surface and the second support surface is 10°, and the second preset angle formed by the fourth support surface and the first support surface is 80°.

[0024] This application provides an integrated automated device for pretreatment of screenings after concentration and weight control. It pretreatments screenings by concentrating, controlling weight, and maintaining a stable pH value, ensuring the stability of the fermentation acid production system, increasing the hydrolysis rate of the screenings matrix, and thus increasing the yield of volatile short-chain fatty acids during anaerobic fermentation. This achieves control over the organic load of screenings, while saving equipment floor space and operating costs. It has a high degree of automation and does not require additional labor costs.

[0025] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0028] Figure 2 This is a schematic diagram of the overall top view of the structure of this utility model.

[0029] Figure 3 Schematic diagram of curved filter screen structure

[0030] Figure 4 This is a schematic diagram of the pretreatment area structure of this utility model.

[0031] Figure 5SCOD variation trend with pH value and pretreatment time

[0032] In the diagram: 1. Automatic control box; 2. Feeding and filtration area; 21. Screenings feed inlet; 22. Filtration area; 23. Filtered water discharge outlet; 31. Filter screen; 311. Filter screen rotating rod; 312. First support rod; 313. Second support rod; 314. Fourth support rod; 315. Fifth support rod; 316. Third support rod; 317. Support structure surface; 318. Filter screen; 32. Air backwash nozzle assembly; 33. Wastewater Nozzle assembly; 34. First motor; 41. Screenings temporary storage area; 421. Bow-shaped rotary valve; 422. Bow-shaped rotary valve rotating rod; 43. Second motor; 51. Pretreatment area load-bearing shell; 52. Pretreatment area; 531. Agitator; 532. Third motor; 54. Weight detector; 55. pH sensor; 56. Discharge port solenoid valve; 61. Chemical storage tank; 62. Dosing pipe; 63. Metering pump; 71. Screw pump. Detailed Implementation

[0033] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0034] It is important to note that terms such as "first," "second," "symmetric," and "array" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with terms such as "first" or "symmetric" may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features.

[0035] In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the accompanying drawings and specific circumstances.

[0036] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] The technical solution provided in this application relates to filtration and concentration, as well as pretreatment enhancement technology, for screenings before anaerobic fermentation to produce acid. Existing screenings pretreatment methods generally include alkali treatment, acid treatment, ultrasonic treatment, and heat treatment.

[0038] However, the inventors discovered that existing screenings pretreatment methods have the following problems: slow screenings hydrolysis rate, low efficiency, and high pretreatment cost.

[0039] In view of the problems of slow hydrolysis rate, low efficiency and high pretreatment cost of screenings in the existing technology pretreatment methods, this application provides an integrated automated device for screenings concentration and weight control pretreatment.

[0040] This application provides an integrated automated device for pretreatment after screenings concentration and weight control, such as... Figure 1 , Figure 2 As shown, the device includes: an automatic control box 1, a screenings inlet 21, a feeding filter module, a screenings temporary storage module, a screenings pretreatment module, a pH control module, and a screenings discharge module.

[0041] The feeding and filtering module includes a filter screen 31, a filter screen rotating rod 311, a first motor 34, a screenings filtering zone 22, and a filtered water discharge port 23. The rotating shaft of the filter screen 31 is fixedly connected to the rotating rod 311. The rotating rod 311 can drive the filter screen 31 to rotate at a certain preset angle. A gear is fixedly connected to the first end of the rotating rod 311. A gear is also fixedly connected to the rotating shaft of the first motor 34. The first end of the rotating rod 311 is connected to the first motor 34 through the gear. The first motor 34 is located on the outside of the device housing.

[0042] The screenings temporary storage module includes a screenings temporary storage area 41, an arc-shaped rotary valve 421, an arc-shaped rotary valve rotating rod 422, and a second motor 43. The arc-shaped rotary valve 421 is located at the bottom of the screenings temporary storage area 41. The rotating shaft of the arc-shaped rotary valve 421 is fixedly connected to the arc-shaped rotary valve rotating rod 422. The arc-shaped rotary valve rotating rod 422 can drive the arc-shaped rotary valve 421 to rotate at a certain preset angle. A gear is fixedly connected to the first end of the arc-shaped rotary valve rotating rod 422. The second motor 43 rotates... The shaft is also fixedly connected to a gear. The first end of the rotating rod 422 of the bow-shaped rotary valve is connected to the second motor 43 through a gear. The second motor 43 is located on the outside of the device housing. The screenings temporary storage area 41 is switched to be connected to the pretreatment area 52 through the bow-shaped rotary valve 421. When the pretreatment area 52 is about to perform pretreatment, the rotating rod 422 of the bow-shaped rotary valve will automatically rotate by a preset angle and close the bow-shaped rotary valve 421, so that the concentrated screenings produced in the feed filtration area 22 are temporarily stored in the screenings temporary storage area 41.

[0043] The screenings pretreatment module includes a pretreatment zone 52, a pretreatment zone load-bearing shell 51, multiple weight detectors 54, a pH control module, and a stirring module. The multiple weight detectors 54 are installed at the contact point between the pretreatment zone 52 and the pretreatment zone load-bearing shell 51. The pH control module includes a pH sensor 55, a chemical storage tank 61, a metering pump 63, and a dosing pipe 62. The pH sensor 55 is located at the lower end of the inner cavity of the pretreatment zone 52, and the dosing pipe 62 is located at the upper part of the inner cavity of the pretreatment zone 52. The stirring module includes a stirrer 531 and a third motor 532. The rotating shaft of the third motor 532 is fixedly connected to the stirrer 531, and the third motor 532 can drive the stirrer 531 to perform stirring operations. The third motor 532 is located above the outer shell of the device.

[0044] The screenings discharge module includes a discharge port solenoid valve 56 and a discharge conduit. A screenings discharge port is provided in the lower part of the inner cavity of the pretreatment zone 52. The conduit is connected to the screenings discharge port, and the solenoid valve is located at the screenings discharge port.

[0045] The automatic control box 1 is electrically connected to the first motor 34, the second motor 43, the multiple weight detectors 54, the pH sensor 55, the metering pump 63, the third motor 532, and the discharge port solenoid valve 56, and can control their operation. Under special circumstances, the automatic control box 1 can cut off the automatic control function of the device and switch to manual operation mode. The weight detectors 54 can detect the weight of the pretreatment area 52 in real time and transmit the data to the automatic control box 1.

[0046] The filter screen rotating rod 311 can rotate at a certain preset angle under the drive of the first motor 34, which can transfer the screen residue concentrated by the filter screen 31 to the screen residue temporary storage area 41.

[0047] The screenings temporary storage area 41 is connected to or separated from the pretreatment area 52 through the bow-shaped rotary valve 421. When the rotating rod 422 of the bow-shaped rotary valve rotates the bow-shaped rotary valve 421 until it closes with the lower structure of the screenings temporary storage area 41, the screenings temporary storage area 41 and the pretreatment area 52 are in a separated state; otherwise, they are in a connected state.

[0048] In one embodiment, such as Figure 3The filter screen 31 is a curved filter screen 31, which is disposed between the feed filtration zone 22 and the screenings temporary storage zone 41. The curved filter screen 31 includes a filter screen and a screen support. The screen support includes a plurality of first support rods 312, a plurality of second support rods 313, a plurality of third support rods 316, at least two fourth support rods 314, and a plurality of fifth support rods 315. The plurality of third support rods 316 are curved arc-shaped.

[0049] The first ends of the plurality of first support rods 312 are respectively fixedly connected to the first ends of the plurality of third support rods 316. The first ends of the second support rods 313 are respectively fixedly connected to a point between the two ends of the plurality of third support rods 316. The second ends of the plurality of first support rods 312 are respectively fixedly connected to the second ends of the second support rods 313. The second ends of the plurality of third support rods 316 are respectively fixedly connected perpendicularly to the shaft of one of the fifth support rods 315. The first ends of the two fourth support rods 314 are respectively fixedly connected to the second ends of the two outermost third support rods 316. The second ends of the two fourth support rods 314 are respectively fixedly connected to the second ends of the two outermost first support rods 312.

[0050] The first ends of the plurality of first support rods 312, the plurality of second support rods 313, and the at least two fourth support rods 314 are all equally spaced and vertically fixedly connected to the body of the filter screen rotating rod 311. The second ends of the plurality of first support rods 312, the plurality of second support rods 313, and the at least two fourth support rods 314 are all fixedly connected to the body of the third support rod 316. The plurality of fifth support rods 315 are respectively vertically connected to the body of the third support rod 316, and the plurality of fifth support rods 315 are all parallel to the body of the filter screen rotating rod 311.

[0051] The first support surface formed by the plurality of first support rods 312 and the second support surface formed by the plurality of second support rods 313 form a first preset angle. Optionally, the first preset angle can be set to 5°–15°. This structure ensures that the concentrated screenings can better utilize their own gravity to fall into the screenings temporary storage area 41. The fourth support surface formed by the at least two fourth support rods 314 forms a second preset angle with the first support surface. Optionally, the second preset angle is 75°–85°. This structure prevents the screenings from flowing into the screenings temporary storage area 41 without concentration when the curved filter screen 31 is clogged. To accommodate the capacity requirements of the filter screen 31, the first preset angle is 10° and the second preset angle is 80°. The transfer of concentrated screenings between the feed filter area 22 and the screenings temporary storage area 41 is achieved through the curved filter screen 31.

[0052] The second support surface is covered with a plate to form a sealing surface, and the third support curved surface formed by the plurality of third support rods 316 is covered with a screen. The two ends of the filter screen 31 are covered with a plate to form a sealing surface by the fifth support surface formed by the second support rod 313, the third support rod 316 and the fourth support rod 314. For greater durability, the plate is a stainless steel plate and the screen is a stainless steel wire screen.

[0053] In this embodiment, the side length of the screen mesh formed by the curved surface of the plurality of third support rods 316 is 0.35 mm. By using a 0.35 mm screen to concentrate the generated screenings, experiments show that simple filtration through a 0.35 mm screen can reduce the moisture content of the retained material to 70-80%.

[0054] In one embodiment, the feed filtration module further includes an air backwash nozzle assembly 32, which is positioned above the screenings temporary storage area 41, slightly above the feed inlet, with the nozzles of the air backwash nozzle assembly 32 facing downwards at a 45° angle. A solenoid valve is installed at the main switch of the air backwash nozzle assembly 32, electrically connected to and controlled by the automatic control box 1. Air backwashing is performed according to the rotation state of the curved filter screen 31. When the curved filter screen 31 rotates towards the screenings temporary storage area 41, the automatic control box 1 issues a command to open the solenoid valve of the air backwash nozzle during the rotation of the curved filter screen 31. The air backwash nozzle utilizes the rotational characteristics of the curved filter screen 31 to achieve a fixed backwash nozzle cleaning of the entire screen and to allow the screenings remaining on the curved filter screen 31 to fall into the screenings temporary storage area 41 through air flushing.

[0055] In one embodiment, the feed filtration module further includes a wastewater nozzle assembly 33, which is disposed in the headspace above the pretreatment zone 52. A solenoid valve is provided at the main switch of the wastewater nozzle assembly 33, and the solenoid valve is electrically connected to and controlled by the automatic control box 1.

[0056] Preferred, such as Figure 4 The pretreatment zone 52 has a load-bearing outer shell 51. A weight detector 54 is mounted on the upper edge of the load-bearing outer shell 51. This weight detector 54 can sense weight changes in the inner structure of the pretreatment zone 52 and upload the weight information to the automatic control box 1 for relevant action decisions. The inner structure is fixed by the load-bearing outer shell 51. Its bottom is conical, with a screenings discharge port at the very bottom. A pipe section connects to a screw pump 71 to transport the pretreated screenings to the fermenter for acid production. A solenoid valve is installed between the discharge port and the screw pump 71. Both the solenoid valve and the screw pump 71 are controlled by the automatic control box 1.

[0057] The metering pump 63 automatically delivers sodium hydroxide solution to the pretreatment zone 52 for pH adjustment via the dosing pipe 62. A dosing port is located on the upper left side of the storage tank 61, adjacent to the water inlet, and a stirrer is positioned directly above it. A solenoid valve is also installed at the corresponding screenings inlet 21, and the automatic control box 1 is electrically connected to this solenoid valve, controlling its opening and closing.

[0058] This device ensures the stability of the fermentation acid production system and improves the fermentation acid production effect while saving equipment floor space and operating costs. Through an automatic control system, it achieves the linkage of the curved filter screen 31, the bow-shaped rotary valve 421, the weight detection module, the pH sensor 55, various solenoid valves, the metering pump 63, and various motors to realize the functions of screenings filtration, concentration, and weight control, and to adjust the pH to ensure the pretreatment effect. It ensures the stability of the fermentation acid production system, increases the hydrolysis rate of the screenings matrix, and thus increases the yield of volatile short-chain fatty acids during anaerobic fermentation, achieving control over the organic load of the screenings.

[0059] When the device is in operation, the solenoid valve of the screenings inlet 21 is normally open. The curved filter screen 31 is automatically rotated by setting the number of backwashing cycles (5 times) and the waiting time for the last backwash (2 minutes), thereby transferring the screenings on the screen to the screenings storage area 41. After the set number of cycles and waiting time are reached, the automatic control box 1 automatically starts the first motor 34. The first motor 34 drives the first gear set, causing the curved filter screen 31 to rotate towards the screenings storage area 41 by a first preset angle. The first preset angle ranges from 90° to 180°, preferably 180°. Then, the first motor 34 stops. When the first preset angle is 180°, the angle between the second support surface and the vertical plane is the first preset angle, and the screenings fall into the screenings storage area 41 under their own gravity. During rotation, the solenoid valve of the air backwash nozzle is open, backwashing the screen with air and promoting the removal of trapped material from the curved filter screen 31 into the screenings storage area 41. After this process is completed, the first motor 34 reverses, causing the curved filter screen 31 to return to its initial position and continue the filtration and concentration work. The curved filter screen 31 repeats this process when the concentrated screenings weight in the pretreatment zone 52 has not reached the set target concentrated weight m1 or when the pretreatment zone 52 is in operation. When the set target concentration time is reached, the curved filter screen 31 rotates a first preset angle towards the filtration zone 22, pausing the screenings filtration work. At this time, the screenings discharged through the screenings inlet 21 are directly discharged through the filtered water outlet 23 of the feed filtration zone 22. The bow-shaped rotary valve 421 of the screenings storage area 41 is always closed when the pretreatment zone 52 is in the pretreatment working state, and always open otherwise. When the pretreatment zone 52 is about to start operation and the bow-shaped rotary valve 421 is about to close, the automatic control box 1 issues a command to open the solenoid valve at the wastewater inlet above the screenings storage area 41. The solenoid valve at the wastewater inlet automatically closes only when the weight of the pretreatment zone 52 reaches the preset total weight m2. Subsequently, the bow-shaped rotary valve 421 closes and the pretreatment zone 52 begins operation. When the set pretreatment time (pretreatment time ≥ 4 hours) is reached, the automatic control box 1 issues a command to close the weight detection module located in the pretreatment zone 52, turn on the stirrer 531 located directly above the pretreatment zone 52, and turn on the pH sensor 55 and metering pump 63. Then, sodium hydroxide solution is added to the pretreatment zone 52 through the dosing pipe 62, and the pH sensor 55 transmits the pH value of the pretreatment zone 52 in real time. The automatic control box 1 adjusts the frequency of the metering pump 63 in real time using a PID algorithm to maintain the pH value at 11 during the pretreatment process. Figure 5By using sodium hydroxide for alkaline pretreatment, and through comparative experiments, it was found that the dissolution effect of SCOD was ideal at pH=11 and a pretreatment time of 4h. Under these pretreatment parameters, the dissolution of organic matter in the retentate can be effectively promoted, the hydrolysis rate of the retentate can be increased, and thus the yield of volatile short-chain fatty acids during anaerobic fermentation can be increased.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A grid residue concentration control weight pretreatment integrated automatic device, characterized in that, Include: The shell, self-control box (1), grid residue feeding port (21), feed filter module, grid residue temporary storage module, grid residue pretreatment module, PH value control module, grid residue leading-out module; The feed filter module includes a filter screen (31), a filter screen rotating rod (311), a first motor (34), a grid residue filtering area (22), and a filtered water discharge port (23). The rotating shaft of the filter screen (31) is fixedly connected with the filter screen rotating rod (311). The filter screen rotating rod (311) can drive the filter screen (31) to rotate by a certain preset angle. One end of the filter screen rotating rod (311) is connected with the first motor (34) through a gear. The first motor (34) is arranged outside the device shell; The grid residue temporary storage module includes a grid residue temporary storage area (41), an arc-shaped rotating valve (421), an arc-shaped rotating valve rotating rod (422), and a second motor (43). The arc-shaped rotating valve (421) is arranged at the bottom of the grid residue temporary storage area (41). The rotating shaft of the arc-shaped rotating valve (421) is fixedly connected with the arc-shaped rotating valve rotating rod (422). The arc-shaped rotating valve rotating rod (422) can drive the arc-shaped rotating valve (421) to rotate by a certain preset angle. One end of the arc-shaped rotating valve rotating rod (422) is connected with the second motor (43) through a gear. The second motor (43) is arranged outside the device shell; The grid residue pretreatment module includes a pretreatment area (52), a pretreatment area load-bearing shell (51), a plurality of weight detectors (54), a PH value control module, and a stirring module. The plurality of weight detectors (54) are installed at the contact position of the pretreatment area (52) and the pretreatment area load-bearing shell (51). The PH value control module includes a pH sensor (55), a medicine storage tank (61), a metering pump (63), and a dosing pipe (62). The pH sensor (55) is fixed in the inner cavity of the pretreatment area (52). The dosing pipe (62) is fixed at a position above the inner cavity of the pretreatment area (52). The stirring module includes a stirrer (531) and a third motor (532). The rotating shaft of the third motor (532) is fixedly connected with the stirrer (531). The third motor (532) can drive the stirrer (531) to work. The third motor (532) is arranged above the device shell; The grid residue leading-out module includes a discharge port electromagnetic valve (56) and a discharge conduit. The grid residue discharge port is arranged at the lower part of the inner cavity of the pretreatment area (52). The discharge conduit is connected with the grid residue discharge port. The discharge port electromagnetic valve (56) is electrically connected with the self-control box (1); The self-control box (1) is electrically connected with the first motor (34), the second motor (43), the plurality of weight detectors (54), the pH sensor (55), the metering pump (63), the third motor (532), and the discharge port electromagnetic valve (56), and can control the work of the above-mentioned components. The filter screen rotating rod (311) is rotated by the first motor (34) by a preset angle, and the filter screen (31) can transfer the concentrated grid residues to the grid temporary storage area (41); The grid temporary storage area (41) is communicated with or separated from the pretreatment area (52) through the arc-shaped rotating valve (421). When the arc-shaped rotating valve rotating rod (422) rotates the arc-shaped rotating valve (421) until it is closed with the lower structure of the grid temporary storage area (41), the grid temporary storage area (41) and the pretreatment area (52) are in a separated state, and vice versa.

2. The apparatus of claim 1, wherein, The filter screen (31) is a curved filter screen, which is arranged between the feed filtering area (22) and the grid temporary storage area (41). The curved filter screen comprises a filter screen mesh and a screen mesh support. The screen mesh support comprises a plurality of first support rods (312), a plurality of second support rods (313), a plurality of third support rods (316), at least two fourth support rods (314), and a plurality of fifth support rods (315). The plurality of third support rods (316) are in the shape of a curved arc. The first ends of the plurality of first support rods (312), the plurality of second support rods (313), and the plurality of fourth support rods (314) are fixedly connected to the rod body of the filter screen rotating rod (311) at equal intervals. The second ends of the plurality of first support rods (312), the plurality of second support rods (313), and the at least two fourth support rods (314) are fixedly connected to the rod body of the third support rod (316). The plurality of fifth support rods (315) are connected to the rod body of the third support rod (316) at right angles. The plurality of fifth support rods (315) are parallel to the rod body of the filter screen rotating rod (311). The first support surface formed by the plurality of first support rods (312) and the second support surface formed by the plurality of second support rods (313) form a first preset included angle. The fourth support surface formed by the two fourth support rods (314) and the first support surface form a second preset included angle. The second support surface is paved with a sealing surface. The third support curved surface formed by the plurality of third support rods (316) is paved with a screen mesh. The two ends of the filter screen (31) are paved with a sealing surface by the fifth support surface formed by the second support rod (313), the third support rod (316), and the fourth support rod (314).

3. The integrated automatic device for pre-treating concentrated and weighed grid residue according to claim 2, characterized in that: The mesh hole length of the screen mesh paved by the plurality of third support rods (316) is 0.35 mm.

4. The integrated automatic device for pre-treating concentrated and weighed grid residue according to claim 3, characterized in that: The feed filtering module further comprises an air backwashing nozzle group (32). The air backwashing nozzle group (32) is arranged above the grid temporary storage area (41) and deviates to one side above the feed inlet. The nozzles of the air backwashing nozzle group (32) are arranged at 45° downward. An electromagnetic valve is arranged at the total switch of the air backwashing nozzle group. The electromagnetic valve is electrically connected with the automatic control box.

5. The integrated automatic device for pre-treating concentrated and weighed grid residue according to claim 4, characterized in that: The feed filtering module further comprises a sewage shower head group (33) arranged at the top space above the pretreatment area (52), and an electromagnetic valve is arranged at the total switch of the sewage shower head group, which is electrically connected with the automatic control box.

6. The integrated automatic device for pre-treating concentrated and weighed grid residue according to claim 5, characterized in that: The bottom of the pretreatment area (52) is a cone, and the electromagnetic valve (56) of the discharge port is arranged at the top opening of the cone.

7. The automatic device for pre-treatment of concentrated and weighed grid residue according to any one of claims 2-6, characterized in that: The first preset included angle formed by the first support surface and the second support surface is 10°, and the second preset included angle formed by the fourth support surface and the first support surface is 80°.

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