A multifunctional regenerated aggregate bioremediation immersion device

Abstract

The invention discloses a multifunctional regenerated aggregate bioremediation immersion device, comprising a bioremediation solution preparation box, a solution mixing box, a bioremediation immersion chamber and a central control system arranged from top to bottom; the liquid outlet of the bioremediation solution preparation box is connected to the bioremediation immersion chamber; the bioremediation immersion chamber comprises a porous immersion screen, a screen rotating shaft, an experimental data acquisition mechanism and an experimental environment control mechanism; the porous immersion screen is used for placing regenerated aggregate, and multiple porous immersion screens are arranged in sequence from top to bottom, and the multiple porous immersion screens are all installed on the screen rotating shaft; the screen rotating shaft is used to drive the multiple porous immersion screens to rotate synchronously; the central control system is used to regulate the working state of the multifunctional regenerated aggregate bioremediation immersion device; the device can realize the integration of the liquid preparation process, the aggregate immersion and repair process and the aggregate repair effect evaluation process.

Description

Technical Field

[0001] The invention relates to the technical field of regenerated aggregate bioremediation, in particular to a multifunctional regenerated aggregate bioremediation soaking device. Background Art

[0002] Aggregates are essential raw materials for transportation infrastructure construction. With the rapid growth of road construction, my country is facing a resource crisis due to a shortage of high-quality natural sand and gravel. Furthermore, urban upgrading and renovation projects are generating a surge in construction waste generated by the demolition and reconstruction of obsolete infrastructure. Therefore, processing construction waste into recycled aggregates, partially replacing natural aggregates in road construction (cement concrete pavements, cement-stabilized gravel bases, etc.), can not only alleviate the resource crisis but also effectively improve the resource utilization efficiency of urban solid waste.

[0003] However, recycled aggregate from construction waste has numerous microcracks and pores on its surface, resulting in high water absorption and low strength. When combined with new cement mortar, this creates multiple interface transition zones, making it difficult to meet the mechanical performance requirements of road construction projects. Therefore, it must be subjected to enhanced repair treatment before use. Compared to traditional physical and chemical treatment methods, microbial induced calcium carbonate precipitation (MICP) technology utilizes mineralizing microorganisms (such as Bacillus pasteurianus) to produce urease through their metabolism. Urease then hydrolyzes urea, inducing calcium carbonate deposition in the recycled aggregate. This cutting-edge method allows for in-situ repair of internal defects in the recycled aggregate. This method avoids secondary damage to the recycled aggregate caused by physical repair methods, as well as the pollution to the aggregate and the environment caused by chemical repair methods.

[0004] Current bioremediation immersion methods for recycled aggregates involve only static immersion, which presents issues with solution heterogeneity and insufficient contact between the solution and the aggregates due to the stacking of the aggregates. Second, there is a lack of quantitative monitoring and analysis methods for the progress of the enzymatic reaction during the immersion process (which can evaluate the repair effect). Third, the influence of aggregate size on the repair effect is overlooked. Fourth, the repair effect of recycled aggregates is currently evaluated primarily through destructive methods such as crushing value, weak particle content testing, and robustness, which makes it difficult to ensure consistency between the properties of the aggregate used and the aggregate being measured. Due to the existence of these issues, it is currently difficult to guarantee and accurately test the repair effect of bioremediation on recycled aggregates of various particle sizes under different working conditions, which restricts the application and promotion of microbially enhanced recycled aggregates in road projects such as cement concrete pavements or recycled cement-stabilized gravel bases.

[0005] Therefore, in the process of regenerated aggregate repair, it is necessary to ensure that the regenerated aggregate is in full and uniform contact with the solution; it is possible to accurately monitor the concentration of the marker ions (Ca2+, CaCl2, and bacterial solution) in the solution under different working conditions (temperature, etc.) and concentrations of the aggregate repair precursors (urea, calcium chloride, and bacterial solution, etc.). 2+ NH4+ The concentration of ) changes with the immersion repair time; the mass increase rate can be obtained by the mass difference of the recycled aggregate on each level of the sieve before and after the repair, and the repair effect of bioremediation on recycled aggregates of different sizes can be accurately analyzed; by Ca 2+ Concentration reduction rate, NH4 + The bioremediation effect of recycled aggregates can be comprehensively, non-destructively, and accurately evaluated by the concentration increase rate and the mass increase rate of the repaired aggregate, guiding the regulation of aggregate properties in engineering projects. However, there are currently no specialized devices or application methods to achieve this function. Summary of the Invention

[0006] The purpose of the present invention is to provide a multifunctional recycled aggregate bioremediation immersion device to enhance the repair effect of microorganisms on recycled aggregates from construction waste and to achieve accurate and non-destructive testing of the repair effect.

[0007] In order to solve the above technical problems, the present invention provides a multifunctional regenerated aggregate bioremediation immersion device, comprising a bioremediation solution preparation box, a solution mixing box, a bioremediation immersion chamber and a central control system arranged from top to bottom; the liquid outlet of the bioremediation solution preparation box is connected to the bioremediation immersion chamber; the bioremediation immersion chamber comprises a porous immersion screen, a screen rotating shaft, an experimental data acquisition mechanism and an experimental environment control mechanism; the porous immersion screen is used to place regenerated aggregate, and multiple porous immersion screens are arranged in sequence from top to bottom, and multiple porous immersion screens are all installed on the screen rotating shaft; the screen rotating shaft is used to drive multiple porous immersion screens to rotate synchronously; the experimental data acquisition mechanism is used to obtain experimental data in the bioremediation immersion chamber; the experimental environment control mechanism is used to regulate the experimental environment in the bioremediation immersion chamber; the central control system is used to regulate the working state of the multifunctional regenerated aggregate bioremediation immersion device.

[0008] In one embodiment, the bioremediation solution preparation box includes a solution preparation box and a solution mixing box arranged from top to bottom; there are multiple solution preparation boxes, and each of the multiple solution preparation boxes is provided with a separate water inlet pipe, a vertically rotating stirring blade and a controllable pipette port; the separate water inlet pipe is connected to the interior of the solution preparation box; the vertically rotating stirring blade is provided inside the solution preparation box; the controllable pipette port connects the interior of the solution preparation box with the interior of the solution mixing box.

[0009] In one embodiment, the blade center axis of the vertical rotating stirring blade is inserted into the solution mixing box; a stirring fan is provided inside the solution mixing box, and the stirring fan is connected to the blade center axis, so that the stirring fan and the vertical rotating stirring blade form a structure that shares the blade center axis as a rotating axis; a sealed push-pull partition is provided at the bottom of the solution mixing box, and the opening of the sealed push-pull partition is used to connect the solution mixing box and the bioremediation immersion chamber.

[0010] In one embodiment, the porous immersion screen is made of a high-density composite material of nylon fibers, and the mesh openings of the multiple layers of the porous immersion screen gradually become smaller from top to bottom.

[0011] In one embodiment, the screen rotating shaft is rotatably installed at the bottom center of the bioremediation immersion chamber, and a plurality of screen slots are provided on the upper part of the screen rotating shaft. The plurality of screen slots are arranged in sequence in the vertical direction, and the detachable porous immersion screen is installed in each of the plurality of screen slots.

[0012] In one embodiment, the experimental data acquisition mechanism includes a weighing sensor and a fiber optic water level meter; the weighing sensor is arranged on the rotating screen, and the weighing sensor is used to weigh the mass of the recycled aggregate before and after repair; the fiber optic water level meter is arranged on the inner wall of the bioremediation immersion chamber, and the fiber optic water level meter is used to detect the water level of the immersion solution.

[0013] In one embodiment, the experimental data acquisition mechanism includes an immersion solution ion concentration monitoring device, which is arranged on the inner wall of the bioremediation immersion chamber. The immersion solution ion concentration monitoring device is provided with a calcium ion concentration meter probe and an ammonium ion concentration meter probe, and in the direction from top to bottom, multiple calcium ion concentration meter probes and multiple ammonium ion concentration meter probes are alternately arranged at equal intervals.

[0014] In one embodiment, the experimental environment control mechanism includes a water temperature regulating and controlling device, which is arranged on the inner wall of the bioremediation immersion chamber, and is used to regulate the internal temperature of the bioremediation immersion chamber.

[0015] In one embodiment, the experimental environment control mechanism includes a dust collection and drying device with a louver-shaped surface, and the dust collection and drying device extends between the bottom and top of the inner wall of the bioremediation immersion chamber, and a gap is left between the dust collection and drying device and the inner wall of the bioremediation immersion chamber for temporarily storing floating dust.

[0016] In one embodiment, the bioremediation immersion chamber is provided with a manual swing door with a safety lock, and the manual swing door is provided with a multi-layer rubber ring sealing strip for preventing the solution from flowing out during the test.

[0017] The beneficial effects of the present invention are as follows:

[0018] In response to the problems existing in the current bioremediation soaking methods and evaluation methods for recycled aggregates, the present invention designs a multifunctional recycled aggregate bioremediation soaking device, which is applicable to multiple working conditions and can realize the integration of the soaking liquid preparation process, the aggregate soaking and repair process, and the aggregate repair effect evaluation process. It can ensure that the calcium ion concentration probe and the ammonium ion concentration probe in the soaking solution ion concentration detection device can accurately monitor the Ca ion concentration under the premise that the soaking solution itself is uniform and fully infiltrates the recycled aggregate. 2+ NH4 + The concentration changes with the soaking time of aggregate, from Ca 2+ Concentration reduction rate, NH4 + The coverage of biological CaCO3 on the surface of the recycled aggregate was judged by the concentration increase rate; further, the repair effect of bioremediation on recycled aggregates of different sizes was analyzed by the mass increase rate of the recycled aggregate on each level of the sieve after repair. 2+ Concentration reduction rate, NH4 + The three indicators of concentration increase rate and aggregate mass increase rate after repair comprehensively, non-destructively and accurately evaluate the bioremediation effect of recycled aggregates, guide the regulation of recycled aggregate performance in actual projects, and solve the problem that previous destructive testing methods could not ensure that the performance of the aggregate used was consistent with the aggregate being measured. It has a certain scientific nature. The test device has a simple structure, and all parts can be disassembled and replaced. It has a long service life, is easy to maintain, has high test accuracy, strong practicality, high promotion value, and low cost. In addition, the application method is easy to master, and it can test the same type of ion concentration at multiple measuring points to ensure the accuracy of the test results. It solves the problems of the previous recycled aggregate soaking process being cumbersome, the soaking effect being uneven, and the repair effect test method having low accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a multifunctional recycled aggregate bioremediation immersion device;

[0021] Figure 2 Schematic diagram of the porous immersion screen structure;

[0022] Figure 3 This is a schematic diagram of a sealed sliding partition guide rail;

[0023] Figure 4 This is a schematic diagram of a digital display control panel;

[0024] Figure 5 This is a schematic diagram of the computer data display screen;

[0025] Figure 6 This is a schematic diagram of module connections of electronic devices in the test device of the present invention;

[0026] Figure 7 is the Ca in the aggregate repair process 2+ concentration curve graph;

[0027] Figure 8 It is NH4 in the process of aggregate repair + Concentration curve graph.

[0028] The reference numerals are as follows:

[0029] 1. Bioremediation solution preparation box; 2. Bioremediation immersion chamber; 3. Central control system; 4. Casters with brakes; 5. Computer data display screen; 6. Digital display control panel; 7. Water inlet pipe; 8. Solution preparation box; 9. Vertical rotating stirring fan; 10. Fan blade center axis; 11. Controllable pipetting port; 12. Stirring fan; 13. Solution mixing box; 14. Sealed sliding partition; 15. Guide rail; 16. Fiber optic water level gauge; 17. Water temperature adjustment and control device; 18. Dust collection and drying device; 19. Porous immersion screen; 20. Screen slot; 21. Ion concentration detection device for immersion solution; 22. Calcium ion concentration meter probe; 23. Ammonium ion concentration meter probe; 24. Weighing sensor; 25. Screen rotation axis; 26. Manual swing door; 27. Drain pipe; 28. Recycled aggregate; 29. ​​Power plug. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] 1. Basic structure of the multifunctional regenerated aggregate bioremediation immersion device of the present invention

[0032] The present invention provides a multifunctional regenerated aggregate bioremediation soaking device, which is implemented as follows: Figures 1 to 6As shown, the main body of the device has a size of 600mm×600mm×1400mm, and is externally provided with a digital display control panel 6, a computer data display screen 5, casters with brakes 4, a power plug 29, etc., which can realize the integration of the liquid preparation process, the aggregate immersion repair process and the aggregate repair effect evaluation process; Specifically, the multifunctional regenerated aggregate bioremediation immersion device includes a bioremediation solution preparation box 1, a solution mixing box 13, a bioremediation immersion chamber 2 and a central control system 3 arranged from top to bottom; the liquid outlet of the bioremediation solution preparation box 1 is connected to the bioremediation immersion chamber 2; the bioremediation immersion chamber 2 includes a porous immersion screen Net 19, screen rotating shaft 25, experimental data acquisition mechanism and experimental environment control mechanism; the porous immersion screen 19 is used to place the recycled aggregate 28, and multiple porous immersion screens 19 are arranged in sequence from top to bottom, and multiple porous immersion screens 19 are all installed on the screen rotating shaft 25; the screen rotating shaft 25 is used to drive multiple porous immersion screens 19 to rotate synchronously; the experimental data acquisition mechanism is used to obtain experimental data in the bioremediation immersion chamber 2; the experimental environment control mechanism is used to regulate the experimental environment in the bioremediation immersion chamber 2; the central control system 3 is used to regulate the working state of the multifunctional recycled aggregate bioremediation immersion device.

[0033] like Figure 1 As shown, in this embodiment, the bioremediation solution preparation box 1 is made of stainless steel with good corrosion resistance, and the bioremediation solution preparation box 1 is provided with a solution preparation box 8 and a solution mixing box 13 arranged from top to bottom; there are multiple solution preparation boxes 8, and the multiple solution preparation boxes 8 are all provided with a separate water inlet pipe 7, a vertical rotating stirring blade 9 and a controllable pipette port 11, and the inner wall of the solution preparation box 8 is provided with a scale (a total of 1000 mL, one scale every 10 mL); the separate water inlet pipe 7 is connected to the interior of the solution preparation box 8; the vertical rotating stirring blade 9 is provided inside the solution preparation box 8; the controllable pipette port 11 connects the interior of the solution preparation box 8 and the interior of the solution mixing box 13, thereby ensuring that the solutions in the four solution preparation boxes 8 can enter the solution mixing box 13 through the controllable pipette port 11.

[0034] For example, there are four solution configuration boxes 8 in this embodiment, and the four solution configuration boxes 8 are respectively configured with urea (CO (NH2) 2) solution, calcium chloride (CaCl2) solution, Bacillus pasteurianus liquid and other aggregate repair precursors. One of them is a spare box, which is configured with sodium alginate solution. This solution can better fix Bacillus pasteurianus in the defects of the regenerated aggregate 28, so that the generated biological CaCO3 can fill and repair the surface of the regenerated aggregate 28 to the greatest extent.

[0035] like Figure 1 and Figure 3As shown, this embodiment provides a vertical rotating stirring fan 9 whose blade center axis 10 penetrates into the solution mixing box 13, wherein a motor and wires are provided at the blade center axis 10; a stirring fan 12 is provided inside the solution mixing box 13, and the stirring fan 12 is connected to the blade center axis 10, so that the stirring fan 12 and the vertical rotating stirring fan 9 form a structure with a common blade center axis 10 as a rotating shaft; a sealed sliding partition 14 is provided at the bottom of the solution mixing box 13, and the sealed sliding partition 14 can be installed using a guide rail 15. The opening of the sealed sliding partition 14 is used to connect the solution mixing box 13 and the bioremediation immersion chamber 2, so that after the sealed sliding partition 14 is opened, the mixed solution in the solution mixing box 13 can flow into the bioremediation immersion chamber 2 at the lower end.

[0036] like Figure 1 As shown, in this embodiment, the porous soaking screen 19 is made of a high-density composite material of nylon fibers, and the meshes of the multiple layers of porous soaking screen 19 gradually become smaller from top to bottom.

[0037] For example, in this embodiment, there are a total of 9 layers of porous immersion screens 19, and the 9 layers of porous immersion screens 19 are all arranged in the center of the bioremediation immersion chamber 2, with a diameter of 30 cm, a height of 7 cm per layer, and a total height of 63 cm. The aperture sizes of each layer of porous immersion screen 19 are 37.5 mm, 31.5 mm, 26.5 mm, 19 mm, 16 mm, 13.2 mm, 9.5 mm, 4.75 mm, and 2.36 mm from top to bottom. While the recycled aggregate 28 is being soaked, it is screened to determine the particle grading of the aggregate.

[0038] Moreover, the side walls of the porous immersion screen 19 of this embodiment are all made of porous mesh material, and the side wall material and pore size are consistent with those of the bottom of each layer, so the mixed solution can enter the porous immersion screen 19 through the side wall mesh to fully soak the recycled aggregate 28.

[0039] like Figure 1 As shown, this embodiment provides a screen rotating shaft 25 rotatably installed at the bottom center of the bioremediation immersion chamber 2, and a plurality of screen slots 20 are provided on the upper part of the screen rotating shaft 25. The plurality of screen slots 20 are arranged in sequence in the vertical direction, and a detachable porous immersion screen 19 is installed in each of the plurality of screen slots 20.

[0040] like Figure 1 As shown, this embodiment is provided with an experimental data acquisition mechanism including a weighing sensor 24 and a fiber optic water level meter 16; the weighing sensor is arranged on the rotating screen, and the weighing sensor is used to weigh the mass of the regenerated aggregate 28 before and after repair; the fiber optic water level meter 16 is arranged on the inner wall of the bioremediation immersion chamber 2, and the fiber optic water level meter 16 is used to detect the water level of the immersion solution, and its monitoring range is 0~230L.

[0041] The weighing sensor 24 of this embodiment has an accuracy of mg, and its measured data will be sent to the computer data display screen 5; the motor power of the screen rotating shaft 25 is 180W and the voltage is 220V. The speed can be controlled to rotate at a certain frequency (90-1400 r / min) to allow the recycled aggregate 28 to fully react with the solution during immersion.

[0042] like Figure 1 As shown, this embodiment provides an experimental data acquisition mechanism including an immersion solution ion concentration monitoring device, which is arranged on the inner wall of the bioremediation immersion chamber 2. The immersion solution ion concentration monitoring device is provided with a calcium ion concentration meter probe 22 and an ammonium ion concentration meter probe 23, and in the direction from top to bottom, multiple calcium ion concentration meter probes 22 and multiple ammonium ion concentration meter probes 23 are alternately arranged at equal intervals.

[0043] Specifically, the ion concentration monitoring device of the soaking solution of this embodiment is arranged at the left and right ends of the vertical position in front of the bioremediation soaking chamber 2. The device contains calcium ion concentration meter probes 22 and ammonium ion concentration meter probes 23, which are arranged at equal intervals from top to bottom. There are 6 probes of each type, a total of 12, which are used to monitor calcium ions (Ca) in real time during the soaking process. 2+ ) and ammonium ions (NH4 + ) concentration changes, and transmit the monitoring data to the computer data display screen 5 in real time.

[0044] like Figure 1 As shown, this embodiment provides an experimental environment control mechanism including a water temperature regulating and controlling device 17, which is arranged on the inner wall of the bioremediation immersion chamber 2. The water temperature regulating and controlling device 17 is used to regulate the internal temperature of the bioremediation immersion chamber 2; wherein, the temperature monitoring range of the water temperature regulating and controlling device 17 is 10°C~60°C.

[0045] like Figure 1 As shown, this embodiment provides an experimental environment control mechanism including a dust collection and drying device 18 with a louver-shaped surface. The dust collection and drying device 18 extends between the bottom and top of the inner wall of the bioremediation immersion chamber 2, and a gap is left between the dust collection and drying device 18 and the inner wall of the bioremediation immersion chamber 2 for temporarily storing floating dust.

[0046] Specifically, the dust collection and drying device 18 has a louvered surface and is installed on the left and right inner walls of the bioremediation immersion chamber 2. Its total height is the same as the bioremediation immersion chamber 2, namely 70 cm. It is used to evenly and quickly remove dust from the aggregate surface and dry the aggregate after immersion. The drying temperature can be adjusted from 20°C to 120°C, and the drying and dust collection wind speed range is 0-90m / s.

[0047] like Figure 1 As shown, in this embodiment, the bioremediation immersion chamber 2 is provided with a manual swing door 26 with a safety lock, and the manual swing door 26 is provided with a multi-layer rubber ring sealing strip for preventing the solution from flowing out during the test.

[0048] Since the manual swing door 26 is provided with a safety lock, once the mixed solution enters the bioremediation immersion chamber 2, the safety lock is automatically locked and cannot be opened manually unless the test is completed. In addition, the manual swing door 26 is provided with a multi-layer rubber ring sealing strip to prevent the solution from flowing out during the test.

[0049] like Figure 1 、 Figure 4 and Figure 5 As shown, this embodiment places a central control system 3 at the bottom of the bioremediation immersion chamber 2. Four casters 4 with brakes are installed at the bottom to facilitate the movement of the equipment. The central control system 3 is connected to a computer data display 5 and has a USB port for copying data. A digital display control panel 6 is also provided on the surface of the housing.

[0050] The digital display control panel 6 controls the central control system 3, thereby controlling the temperature and constant temperature time of the immersion solution, the switch of the vertical rotating stirring fan 9 and the inverted stirring fan 12, the speed and rotation time of the screen rotating shaft 25, the wind speed and time of the dust collection and drying device 18, the water inlet of tap water, the water outlet of the controllable pipette port 11, the drainage of the drainage pipe 27 and the equipment switch, and the emergency stop process.

[0051] The computer data display screen 5 is connected to the central control system 3 to display the change curve of different ion concentrations in the solution as well as parameters such as soaking time, water level, water temperature, aggregate quality before and after repair, and grading.

[0052] 2. Application method of the multifunctional regenerated aggregate bioremediation immersion device of the present invention

[0053] 2.1 Basic Principles

[0054] The above device is used to soak and repair the recycled aggregate 28. The rotation and vibration of the porous soaking screen 19 during the soaking and repair process of the recycled aggregate 28 ensures the uniformity of the soaking solution itself and fully infiltrates the aggregate. The calcium ion concentration probe 22 and the ammonium ion concentration probe 23 in the soaking solution ion concentration detection device 21 accurately monitor the Ca 2+ NH4 + The concentration changes with the soaking time of aggregate, from Ca 2+ Concentration reduction rate, NH4 +The coverage of biological CaCO3 on the surface of the recycled aggregate 28 is judged by the concentration increase rate; further, the repair effect of biological repair on recycled aggregate 28 of different sizes is analyzed by the mass increase rate of the recycled aggregate 28 on each level of the screen after repair. 2+ Concentration reduction rate, NH4 + The three indicators of concentration increase rate and aggregate mass increase rate after repair are used to comprehensively, non-destructively, and accurately evaluate the bioremediation effect of recycled aggregate 28. This device can integrate the immersion liquid preparation process, the aggregate immersion repair process, and the evaluation of the aggregate repair effect.

[0055] 2.2 Operation steps

[0056] S1. Open the manual swing door 26 and place 2000 g of mixed-size recycled aggregate 28 from construction waste flat on the top layer of the porous immersion screen 19. Close the manual swing door 26 to ensure that the bioremediation immersion chamber 2 is airtight. On the digital control panel 6, turn on the "On / Off" button in the lower right corner to activate the main power supply. Set the screen rotation time to 3 minutes and the speed to 1000 rpm to screen the recycled aggregate 28 according to the particle size.

[0057] The initial mass of aggregate on each sieve (accurate to mg) is measured by weighing sensor 24. The masses of aggregate on the 37.5mm, 31.5mm, 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, and 2.36mm sieves are 50g, 80g, 200g, 300g, 500g, 400g, 350g, 100g, and 20g, respectively. This data is transmitted to computer display screen 5 via central control system 3, and the corresponding gradation curve is plotted.

[0058] S2. Open the top cover of the solution configuration box 8 and add the required repair precursor solute for the immersion test, wherein the urea concentration is 1.5 mol / L, the CaCl2 concentration is 1.0 mol / L, the Bacillus pasteurianus bacterial solution concentration is 10 8 cells / mL, select the "water inlet" button on the digital display control panel 6, let water in through the water inlet pipe 7, and control the vertical rotating stirring blade 9 to stir the solute and water until they are uniform; press the "pipetting" button to transfer the solutions in each solution preparation box 8 into the solution mixing box 13 through the controllable pipetting port 11, and use the stirring fan 12 to stir for 10 minutes to obtain the aggregate soaking solution; use the guide rail 15 to pull open the sealed sliding partition 14 to allow the aggregate soaking solution to flow into the bioremediation soaking chamber 2, and the solution water level is about 230L, completely immersing the aggregate in the uppermost layer of the porous soaking screen 19, and is specifically monitored by the optical fiber water level meter 16.

[0059] Taking into account the water temperature in the south in summer, the water temperature adjustment and control device 17 is controlled by the digital display control panel 6, and the water temperature of the aggregate soaking liquid is set to 25℃±2℃ and the constant temperature soaking time is 3 days; the porous soaking screen 19 is rotated and vibrated up and down every 2 hours through the screen rotating shaft 25, each rotation time is 5 minutes, and the rotation speed is 100r / min.

[0060] S3 within 3 days of soaking the recycled aggregate 28, the ion concentration of the soaking solution is detected by the calcium ion concentration meter probe 22 and the ammonium ion concentration meter probe 23 in the soaking solution to continuously monitor and record Ca 2+ NH4 + The concentration change curve is taken as the average value of the six probes, and the data is transmitted to the central control system 3 and finally displayed on the computer data display screen 5. The curve of ion concentration change with immersion repair time is shown in Figure 7 and Figure 8 shown.

[0061] S4. After the immersion of the recycled aggregate 28 is complete, select the "Drain" button on the digital display control panel 6 to drain the solution from the bioremediation immersion chamber 2 through the drain pipe 27. Set the drying temperature to 105°C and the wind speed to 90 m / s, and operate the vacuum drying device 18 for approximately 1 hour. After the vacuum drying is complete, measure the weight of the remediated recycled aggregate 28 on each level of the sieve using the weighing sensor 24 (accurate to mg). The weights of the aggregates on the sieves from top to bottom are: 52g, 84g, 208g, 318g, 540g, 420g, 385g, 105g, and 21g, respectively. This weight is transmitted to the computer data display 5, and a particle gradation curve of the remediated recycled aggregate 28 is plotted.

[0062] The manual swing door 26 is opened, the screen slot 20 is rotated, the porous immersion screen 19 is removed layer by layer, and the recycled aggregate 28 is taken out for subsequent molding of the recycled cement-based material mixture. The test is completed.

[0063] S5. Repairing the Ca in the solution 2+ The decrease rate of the constant concentration value relative to the initial value, NH4 + The bioremediation effect on recycled aggregate 28 was quantitatively, comprehensively, and nondestructively determined using three indicators: the rate of increase in the constant concentration relative to the initial value and the rate of increase in the mass of aggregate on each level of the sieve after the regeneration of aggregate 28. The comprehensive evaluation results of the regeneration of aggregate 28 are detailed in Table 1.

[0064] Table 1 Comprehensive evaluation results of the bioremediation immersion effect of recycled aggregates

[0065]

[0066] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multifunctional recycled aggregate bioremediation immersion device, characterized in that: It includes a bioremediation solution preparation box, a solution mixing box, a bioremediation immersion chamber and a central control system arranged from top to bottom; The liquid outlet of the bioremediation solution preparation box is in communication with the bioremediation immersion chamber; The bioremediation immersion chamber includes a porous immersion screen, a screen rotating shaft, an experimental data acquisition mechanism and an experimental environment control mechanism; the porous immersion screen is used to place recycled aggregate, and multiple porous immersion screens are arranged in sequence from top to bottom, and multiple porous immersion screens are all installed on the screen rotating shaft; the screen rotating shaft is used to drive the multiple porous immersion screens to rotate synchronously; the experimental data acquisition mechanism is used to obtain experimental data in the bioremediation immersion chamber; the experimental environment control mechanism is used to regulate the experimental environment in the bioremediation immersion chamber; The central control system is used to regulate the working state of the multifunctional regenerated aggregate bioremediation immersion device; The experimental data acquisition mechanism includes a weighing sensor and an optical fiber water level meter; The weighing sensor is arranged on the rotating screen, and the weighing sensor is used to weigh the mass of the recycled aggregate before and after repair; The optical fiber water level meter is arranged on the inner wall of the bioremediation immersion chamber, and is used to detect the water level of the immersion solution; The experimental data acquisition mechanism includes an immersion solution ion concentration monitoring device, which is arranged on the inner wall of the bioremediation immersion chamber. The immersion solution ion concentration monitoring device is provided with a calcium ion concentration meter probe and an ammonium ion concentration meter probe, and in the direction from top to bottom, multiple calcium ion concentration meter probes and multiple ammonium ion concentration meter probes are alternately arranged at equal intervals.

2. The multifunctional recycled aggregate bioremediation soaking device according to claim 1, characterized in that: The bioremediation solution preparation box includes a solution preparation box and a solution mixing box arranged from top to bottom; There are multiple solution configuration boxes, each of which is equipped with a separate water inlet pipe, a vertical rotating stirring fan blade and a controllable pipetting port; The separate water inlet pipe is connected to the interior of the solution configuration box; The vertical rotating stirring blade is arranged inside the solution configuration box; The controllable pipetting port connects the interior of the solution configuration box and the interior of the solution mixing box.

3. The multifunctional recycled aggregate bioremediation soaking device according to claim 2, characterized in that: The central axis of the vertical rotating stirring blade is inserted into the solution mixing box; A stirring fan is provided inside the solution mixing box, and the stirring fan is connected to the central axis of the fan blade, so that the stirring fan and the vertical rotating stirring blade form a structure that shares the central axis of the fan blade as a rotating shaft; A sealed push-pull partition is provided at the bottom of the solution mixing box. The sealed push-pull partition is opened to connect the solution mixing box and the bioremediation immersion chamber.

4. The multifunctional recycled aggregate bioremediation soaking device according to claim 1, characterized in that: The porous soaking screen is made of a high-density composite material of nylon fibers, and the mesh openings of the multiple layers of the porous soaking screen gradually become smaller in a direction from top to bottom.

5. The multifunctional recycled aggregate bioremediation soaking device according to claim 1, characterized in that: The screen rotating shaft is rotatably installed at the bottom center of the bioremediation immersion chamber. A plurality of screen slots are provided on the upper part of the screen rotating shaft. The plurality of screen slots are arranged in sequence in the vertical direction. The detachable porous immersion screen is installed in each of the plurality of screen slots.

6. The multifunctional recycled aggregate bioremediation soaking device according to claim 1, characterized in that: The experimental environment control mechanism includes a water temperature regulating and controlling device, which is arranged on the inner wall of the bioremediation immersion chamber and is used to regulate the internal temperature of the bioremediation immersion chamber.

7. The multifunctional recycled aggregate bioremediation soaking device according to claim 1, characterized in that: The experimental environment control mechanism includes a dust collection and drying device with a louver-shaped surface, which is extended between the bottom and top of the inner wall of the bioremediation immersion chamber, and a gap is left between the dust collection and drying device and the inner wall of the bioremediation immersion chamber for temporarily storing floating dust.

8. The multifunctional recycled aggregate bioremediation soaking device according to claim 1, characterized in that: The bioremediation immersion chamber is provided with a manual swing door with a safety lock, and the manual swing door is provided with a multi-layer rubber ring sealing strip for preventing the solution from flowing out during the test process.

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