Multifunctional recycled aggregate bioremediation soaking device

Abstract

The invention discloses a multifunctional recycled aggregate bioremediation soaking device which comprises a bioremediation solution preparation box, a solution mixing box, a bioremediation soaking chamber and a central control system which are arranged from top to bottom, a liquid outlet of the bioremediation solution preparation box is communicated with the bioremediation soaking chamber; the bioremediation soaking chamber comprises a porous soaking screen, a screen rotating shaft, an experimental data acquisition mechanism and an experimental environment control mechanism, the plurality of porous soaking screens are used for placing recycled aggregate, are sequentially arranged from top to bottom, and are all mounted on the screen rotating shaft; the screen rotating shaft is used for driving the plurality of porous soaking screens to rotate synchronously; the central control system is used for regulating and controlling the working state of the multifunctional recycled aggregate bioremediation soaking device; the device can realize integration of a liquid preparation process, an aggregate soaking repair process and an aggregate repair effect evaluation process.

Description

Technical Field

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

[0002] Aggregates are indispensable raw materials in the construction of transportation infrastructure. With the rapid development of road construction, my country is currently facing a resource crisis of shortage of high-quality natural sand and gravel. At the same time, the amount of construction waste generated by the demolition and reconstruction of old infrastructure in urban upgrading and renovation projects has increased sharply. Therefore, processing construction waste into recycled aggregates and partially replacing natural aggregates for use in road projects (cement concrete pavement, cement stabilized gravel base, etc.) can not only alleviate the resource crisis, but also effectively improve the resource utilization efficiency of urban solid waste.

[0003] However, there are a large number of micro cracks and pores on the surface of recycled aggregates from construction waste, with high water absorption and low strength. After combining with new cement mortar, multiple interface transition zones will be formed, which is difficult to meet the mechanical performance requirements of road projects. Therefore, it must be strengthened and repaired before use. Compared with traditional physical and chemical treatment methods, microbial induced calcium carbonate precipitation (MICP) technology is a cutting-edge method that uses microorganisms with mineralization ability (such as Bacillus pasteurianus) to produce urease through their own metabolism. Urease hydrolyzes urea and induces calcium carbonate deposition at the recycled aggregate, thereby repairing the internal defects of the recycled aggregate in situ. This method can avoid the secondary damage to the recycled aggregate caused by physical repair methods, and can also avoid the pollution of aggregates and the environment by chemical repair methods.

[0004] At present, the immersion method for bioremediation of recycled aggregates only involves static immersion, which has the problem of solution non-uniformity, and the stacking of aggregates makes the contact between solution and aggregates insufficient. Second, there is a lack of quantitative monitoring and analysis means for the progress of enzymatic reactions during the immersion process (which can evaluate the repair effect). Third, the influence of aggregate size effect on the repair effect is ignored. Fourth, the repair effect of recycled aggregates is currently mainly evaluated by destructive means such as crushing value, weak particle content test, and firmness, and it is difficult to ensure the consistency of the performance of the aggregates used and the measured aggregates. Due to the existence of the above problems, 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+, bacterial solution, etc.) in the solution under different working conditions (temperature, etc.) and concentrations of the aggregate repair precursors (urea, calcium chloride, bacterial solution, etc.). 2+ NH4+ ) concentration versus 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 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 concentration increase rate and the mass increase rate of the aggregate after repair can be used to comprehensively, non-destructively and accurately evaluate the bioremediation effect of the recycled aggregate and guide the regulation of aggregate performance in engineering. However, there is currently no special device or application method to achieve the above functions. 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 of 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 a plurality of the porous immersion screens are arranged in sequence from top to bottom, and the plurality of the porous immersion screens are all installed on the screen rotating shaft; the screen rotating shaft is used to drive the plurality of the porous immersion screens to rotate synchronously; the experimental data acquisition mechanism is used to acquire 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 vertical rotating stirring blade and a controllable pipetting port; the separate water inlet pipe is connected and conducted with the interior of the solution preparation box; the vertical rotating stirring blade is arranged inside the solution preparation box; the controllable pipetting port connects the interior of the solution preparation box with the interior of the solution mixing box.

[0009] In one of the embodiments, the blade center axis of the vertical rotating stirring blade penetrates 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 of the embodiments, 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 of the embodiments, 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 portion of the screen rotating shaft. The plurality of screen slots are arranged in sequence in the vertical direction, and the removable 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 load-bearing sensor is arranged on the rotating screen, and the load-bearing sensor is used to weigh the mass of the regenerated 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 disposed 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 suction and drying device with a louver-shaped surface, and the dust suction and drying device is extended between the bottom and top of the inner wall of the bioremediation immersion chamber, and a gap is left between the dust suction and drying device and the inner wall of the bioremediation immersion chamber for temporarily storing floating dust.

[0016] In one of the embodiments, 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 view of the problems existing in the current regenerated aggregate bioremediation soaking methods and evaluation methods, the present invention designs a multifunctional regenerated aggregate bioremediation soaking device, which is suitable for 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 meter probe and the ammonium ion concentration meter probe in the soaking solution ion concentration detection device can accurately monitor the Ca ion concentration on the premise that the soaking solution itself is uniform and fully infiltrates the regenerated aggregate. 2+ NH4 + The variation of concentration with aggregate immersion time, from Ca 2+ Concentration reduction rate, NH4 + The coverage of biological CaCO3 on the surface of recycled aggregate was determined by the concentration increase rate; further, the repair effect of biological repair on recycled aggregates of different sizes was analyzed by the mass increase rate of recycled aggregates on each level of 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 measured aggregate. It has a certain scientificity. 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 can be tested at multiple measuring points for the same type of ion concentration to ensure the accuracy of the test results. It solves the problems of cumbersome recycled aggregate soaking process, uneven soaking effect, and low accuracy of repair effect test methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0021] Figure 2 It is a schematic diagram of the porous immersion screen structure;

[0022] Figure 3 It is a schematic diagram of the 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 It is a schematic diagram of module connection of electronic devices in the testing device of the present invention;

[0026] Figure 7 It is Ca in the process of aggregate repair 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 blade; 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 removal and drying device; 19. Porous immersion screen; 20. Screen card 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 rotating shaft; 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 in conjunction with 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 can be 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, a caster with a brake 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, at this time, the multifunctional recycled 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 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 includes 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 1000mL, one scale for every 10mL); the separate water inlet pipe 7 is connected and conducted with the interior of the solution preparation box 8; the vertical rotating stirring blade 9 is arranged inside the solution preparation box 8; the controllable pipette port 11 connects the interior of the solution preparation box 8 with 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 solution 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 at 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, in this embodiment, a blade center axis 10 of a vertical rotating stirring blade 9 is arranged to penetrate into a solution mixing box 13, wherein a motor and an electric wire are arranged at the blade center axis 10; a stirring fan 12 is arranged 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 blade 9 form a structure with a common blade center axis 10 as a rotating axis; a sealed push-pull partition 14 is arranged at the bottom of the solution mixing box 13, and the sealed push-pull partition 14 can be installed using a guide rail 15, and the opening of the sealed push-pull partition 14 is used to conduct the solution mixing box 13 and the bioremediation immersion chamber 2, so that after the sealed push-pull 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 immersion screen 19 is made of a nylon fiber high-density composite material, and the mesh openings of the multiple layers of the porous immersion screen 19 gradually become smaller in a direction 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, each layer is 7 cm high, and the total height is 63 cm. The aperture sizes of each layer of the 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. The recycled aggregate 28 is screened while being soaked 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 materials, and the side wall material and pore size are consistent with 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, in this embodiment, a screen rotating shaft 25 is rotatably installed at the bottom center of the bioremediation immersion chamber 2, and a plurality of screen slots 20 are provided on the upper portion of the screen rotating shaft 25. The plurality of screen slots 20 are arranged in sequence in the vertical direction, and a removable 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 load-bearing sensor is arranged on the rotating screen, and the load-bearing 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 to 230L.

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

[0042] like Figure 1 As shown, this embodiment sets up the 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 soaking solution ion concentration monitoring device of this embodiment is arranged at the left and right ends of the bioremediation soaking chamber 2 in the vertical position, and the device includes a calcium ion concentration meter probe 22 and an ammonium ion concentration meter probe 23, which are arranged equidistantly from top to bottom, with 6 probes of each type, a total of 12, for real-time monitoring of calcium ions (Ca 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 disposed 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 to 60°C.

[0045] like Figure 1 As shown, the experimental environment control mechanism of this embodiment includes a dust collection and drying device 18 with a louver-shaped surface. The dust collection and drying device 18 is extended 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 suction and drying device 18 has a louver-shaped surface and is arranged at the left and right inner walls of the bioremediation immersion chamber 2. The total height is consistent with the bioremediation immersion chamber 2, that is, 70 cm. It is used to evenly and quickly suck away the dust on the surface of the aggregate and dry the aggregate after the aggregate immersion is completed. The drying temperature can be adjusted in the range of 20°C to 120°C, and the drying blowing and dust suction wind speed range is 0 to 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, in this embodiment, the central control system 3 is located at the bottom of the bioremediation immersion chamber 2, and four brake casters 4 are provided at the bottom to facilitate the movement of the equipment. The central control system 3 is connected to a computer data display screen 5, and a USB interface is provided for copying data, and a digital display control panel 6 is provided on the surface of the box.

[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 blades 9 and the inverted stirring fan 12, the rotation speed and rotation time of the screen rotating shaft 25, the wind speed and time of the dust suction 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-side 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 immersion time, water level, water temperature, aggregate quality before and after repair, and grading.

[0052] 2. Application method of the multifunctional recycled aggregate bioremediation immersion device using the 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 porous soaking screen 19 rotates and vibrates during the soaking and repair process of the recycled aggregate 28 to ensure the uniformity of the soaking solution itself and to fully soak the aggregate. The calcium ion concentration meter probe 22 and the ammonium ion concentration meter probe 23 in the soaking solution ion concentration detection device 21 accurately monitor the Ca 2+ NH4 + The variation of concentration with aggregate immersion time, 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 sieve 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. The device can realize the integration of the soaking liquid preparation process, the aggregate soaking repair process and the aggregate repair effect evaluation process.

[0055] 2.2 Operation steps

[0056] S1. Open the manual swing door 26, lay 2000g of mixed particle size construction waste recycled aggregate 28 flat on the top layer of the porous immersion screen 19, close the manual swing door 26, and ensure that the bioremediation immersion chamber 2 is airtight; turn on the "switch" button in the lower right corner of the digital control panel 6 to start the main power supply, set the screen rotation time to 3min, the speed to 1000r / min, and screen the recycled aggregate 28 step by step.

[0057] The initial mass (accurate to mg) of the aggregate on each level of the sieve is measured by the weighing sensor 24. The masses of the 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. The data are transmitted to the computer data display screen 5 through the central control system 3, and the corresponding gradation curve is drawn.

[0058] S2. Open the cover plate above 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, and the concentration of Bacillus pasteurianus 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; open the sealed push-pull partition 14 through the guide rail 15 to make the aggregate soaking solution flow into the bioremediation soaking chamber 2, the solution water level is about 230L, completely immersing the aggregate in the uppermost layer of the porous soaking screen 19, and the optical fiber water level meter 16 is used for monitoring.

[0059] Taking into account the water temperature in the south in summer, the water temperature regulating and controlling 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 soaking constant temperature time is 3 days; the porous soaking screen 19 is rotated and vibrated up and down by the screen rotating shaft 25 every 2 hours, each rotation time is 5 minutes, and the rotation speed is 100r / min.

[0060] S3. During the 3 days of soaking the recycled aggregate 28, the calcium ion concentration meter probe 22 and the ammonium ion concentration meter probe 23 in the soaking solution ion concentration detection device 21 are used to continuously monitor and record the Ca in the soaking solution. 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 completed, select the "drain" button on the digital display control panel 6 to discharge the solution from the bioremediation immersion chamber 2 through the drain pipe 27; set the drying temperature to 105°C, the wind speed to 90m / s, and turn on the dust suction and drying device 18 for about 1h; after the dust suction and drying is completed, measure the weight of the repaired recycled aggregate 28 on each level of the sieve through the weighing sensor 24 (accurate to mg), and the mass of the aggregate from top to bottom of the sieve is: 52g, 84g, 208g, 318g, 540g, 420g, 385g, 105g, 21g, which are transmitted to the computer data display screen 5, and the particle grading curve of the repaired recycled aggregate 28 is drawn.

[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, and the test is completed.

[0063] S5. Repair the Ca in the solution 2+ The decrease rate of the constant concentration value relative to the initial value, NH4 + The increase rate of the constant concentration value relative to the initial value and the increase rate of the aggregate mass on each level of the sieve after the regeneration of aggregate 28 are used to quantitatively, comprehensively and non-destructively determine the repair effect of bioremediation on the regeneration of aggregate 28. The comprehensive evaluation results of the regeneration of aggregate 28 are shown in Table 1.

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

[0065]

[0066] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle 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 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 recycled aggregates, a plurality of the porous immersion screens are arranged in sequence from top to bottom, and the plurality of the porous immersion screens are all installed on the screen rotating shaft; the screen rotating shaft is used to drive the plurality of the porous immersion screens to rotate synchronously; the experimental data acquisition mechanism is used to acquire 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.

2. The multifunctional recycled aggregate bioremediation immersion device according to claim 1 is 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 provided with a separate water inlet pipe, a vertically 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 vertically rotating stirring blades are 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 immersion device according to claim 2 is characterized in that: The central axis of the vertically rotating stirring blade penetrates 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 fan blade form a structure that uses the central axis of the fan blade 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.

4. The multifunctional recycled aggregate bioremediation immersion device according to claim 1 is characterized in that: 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 in a direction from top to bottom.

5. The multifunctional recycled aggregate bioremediation immersion device according to claim 1 is 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 immersion device according to claim 1 is characterized in that: The experimental data acquisition mechanism includes a weighing sensor and an optical fiber water level meter; The load-bearing sensor is arranged on the rotating screen, and the load-bearing 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.

7. The multifunctional recycled aggregate bioremediation immersion device according to claim 1 is characterized in that: 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 with equal intervals.

8. The multifunctional recycled aggregate bioremediation immersion device according to claim 1 is 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 adjust the internal temperature of the bioremediation immersion chamber.

9. The multifunctional recycled aggregate bioremediation immersion device according to claim 1, characterized in that: The experimental environment control mechanism includes a dust suction 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 suction and drying device and the inner wall of the bioremediation immersion chamber for temporarily storing floating dust.

10. The multifunctional recycled aggregate bioremediation immersion 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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