Gradient separation device for purifying nutrient solution

Abstract

The utility model discloses a gradient separation device for purifying a nutrient solution. The gradient separation device comprises a controller and a plurality of groups of diluting and filtering components which are connected in series, each group of assembly comprises two dilution barrels and a membrane filter, the middle upper parts of the side walls of the two dilution barrels are communicated through a communicating pipe, a liquid supplementing pipe and a flow pump are arranged on each barrel, a stirring part and an external driving part are arranged in each barrel, a pH salinity measuring instrument is arranged outside each barrel, and a probe extends to the bottom of each barrel. The bottom of one dilution barrel is connected with a water inlet pipe, the side wall of the other barrel is provided with a first water level sensor and a second water level sensor (the first water level sensor is lower than the second water level sensor and higher than the bottom first water outlet pipe), and the bottom of the other barrel is connected with a first water outlet pipe which is connected with the water inlet end of the membrane filter and provided with a second water pump and a second electric valve. The water outlet end of the membrane filter is connected with a second water outlet pipe; the previous group is connected with the next group of water inlet pipes. And a first water pump and a first electric valve are arranged on the water inlet pipe of the dilution barrel at the foremost end. According to the device, waste liquid is automatically filtered after being automatically diluted.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste liquid purification technical field, concretely relates to a gradient separation device for nutrient solution purification. BACKGROUND

[0002] White liquor brewing wastewater is rich in nutrients required by plants and microorganisms, and has the value of resource utilization. By purifying white liquor brewing wastewater, it can be converted into various high-efficiency nutrient solutions, which not only reduces the pollution of wastewater to the environment, but also realizes the effective utilization of resources.

[0003] However, in actual operation, white liquor brewing wastewater used to manufacture nutrient solution needs to go through a series of processing procedures. First, the wastewater needs to go through the steps of preliminary removal of impurities and organic decomposition. Then, in order to remove microbial residues and insoluble substances, membranes with different pore sizes need to be used for gradient separation. However, the composition of wastewater produced during the brewing process may fluctuate due to batch differences, which may lead to the occurrence of extreme pH or high salt concentration in the waste liquid during gradient separation. Extreme pH or high salt concentration will cause damage to the membrane structure, thereby increasing the replacement frequency and maintenance cost of the membrane, ultimately leading to the increase of production cost.

[0004] In order to avoid this situation, the waste liquid needs to be diluted before membrane gradient separation to make it reach the conditions suitable for membrane separation. However, the current membrane gradient separation device has obvious defects, which cannot effectively combine waste liquid dilution and membrane gradient separation, and it is difficult to achieve ideal separation efficiency.

[0005] Based on the above problems, it is particularly necessary to design a gradient separation device for nutrient solution purification. This device should effectively combine the two links of waste liquid dilution and membrane gradient separation, automatically dilute the waste liquid and then automatically filter it, so as to improve the separation efficiency, reduce the production cost, and better realize the resource utilization of white liquor brewing wastewater. SUMMARY

[0006] The purpose of the utility model is to provide a gradient separation device for nutrient solution purification to solve the problems described in the background art.

[0007] The technical solution of the utility model is as follows:

[0008] A gradient separation device for purification of nutrient solution comprises a controller and multiple groups of series-connected dilution filtration assemblies, each of which comprises two dilution barrels and a membrane filter, the upper parts of the sidewalls of the two dilution barrels are connected by a communication pipe, a liquid supplement pipe is connected to the dilution barrels, a flow pump is arranged on the liquid supplement pipe, a stirring component is arranged in the dilution barrels, a driving component for driving the stirring component is arranged outside the dilution barrels, a pH salinity measuring instrument is arranged outside the dilution barrels, the measuring probe of the pH salinity measuring instrument extends into the bottom of the dilution barrels, a water inlet pipe is connected to the bottom of the sidewall of one of the dilution barrels, a first water level sensor and a second water level sensor are arranged on the sidewall of the other dilution barrel, and a first water outlet pipe is connected to the bottom of the sidewall, the first water level sensor is lower than the second water level sensor and higher than the first water outlet pipe, the first water outlet pipe is connected to the water inlet end of the membrane filter, a second water pump and a second electric valve are arranged on the first water outlet pipe, the water outlet end of the membrane filter is connected to a second water outlet pipe, the water inlet pipe of the dilution filtration assembly of the previous group is connected to the water inlet pipe of the adjacent next group of dilution filtration assemblies through the second water outlet pipe, the filter pore size of the membrane filter in the multiple groups of series-connected dilution filtration assemblies decreases from front to back, a first water pump and a first electric valve are arranged on the water inlet pipe of the dilution barrel of the dilution filtration assembly at the front end of the series connection, and the first water pump, the second water pump, the first electric valve, the second electric valve, the first water level sensor, the second water level sensor, the flow pump, the driving component and the pH salinity measuring instrument are electrically connected to the controller.

[0009] Further, the stirring component comprises a stirring shaft and a stirring rod, the upper end of the stirring shaft is rotatably arranged in the top wall of the dilution barrel and extends upward to be driven by the driving component, the lower end of the stirring shaft extends downward to the middle-lower part of the dilution barrel, and the stirring rod is arranged on the sidewall of the stirring shaft.

[0010] Further, the driving component is a stirring motor, and the upper end of the stirring shaft is driven by the output end of the stirring motor.

[0011] Further, the height of the second water level sensor is arranged above the pipe opening of the communication pipe.

[0012] Further, the height of the second water level sensor is arranged within the height range of the pipe opening of the communication pipe.

[0013] Further, the dilution barrel is a round barrel.

[0014] Further, the dilution filtration assembly is at least three groups or more.

[0015] Further, the height of the first water level sensor is arranged 2-5 cm above the pipe opening of the first water outlet pipe.

[0016] Further, the maximum water flow of the first water pump is smaller than the maximum water flow of the second water pump.

[0017] The utility model discloses the beneficial effect lies in:

[0018] 1, operation is coherent and efficient: through the operation of multiple dilution filtration assemblies in turn, form coherent wastewater treatment flow, until the liquid after purification is discharged from the last group, improve the processing efficiency.

[0019] 2, monitoring and adjusting accurately: be equipped with monitoring process, can according to the detection data of water level sensor and measuring instrument probe, accurately control the opening and closing of water pump, electric valve and other equipment, ensure that each component is stable under different operating conditions. Run.

[0020] 3, prevent backflow reasonably: when the water level of a dilution filtration assembly is too low, the related valve is closed in time, to prevent wastewater backflow, guarantee the orderly progress of the treatment process.

[0021] 4, timely treatment when the pH value and salinity of a group of wastewater do not meet the standards, the related equipment can be closed quickly, the flow pump is started to inject clean water and stir, and the equipment is started again after meeting the standards, to ensure the treatment effect.

[0022] 5, over-standard associated control: in addition to the first group, when the wastewater of the subsequent group exceeds the standard, all groups before the over-standard group stop running, and the first electric valve after the over-standard group is closed, to avoid the problem from being enlarged and to ensure the overall treatment quality.

[0023] 6, dilution design is reasonable: the communication pipe is located in the middle and upper part of the side wall of the dilution barrel, so that the upper end of the dilution barrel has space, which is convenient for the flow pump to inject clean water for dilution and is beneficial to subsequent treatment.

[0024] 7, effectively combine the two links of waste liquid dilution and membrane gradient separation, detect and dilute in time every time the membrane filter inlet liquid, realize automatic dilution treatment and then automatic filtration, improve the separation efficiency, reduce the cost, and be beneficial to the resource utilization of liquor brewing wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is the overall layout of the utility model from the top view.

[0026] Fig. 2 It is the local structure of the dilution filtration assembly from the section side view.

[0027] In the drawing, 1, water inlet pipe, 2, first water pump, 3, first electric valve, 4, dilution barrel, 5, liquid supplement pipe, 6, flow pump, 7, stirring motor, 8, pH salinity measuring instrument, 9, communication pipe, 10, first water outlet pipe, 11, second electric valve, 12, second water pump, 13, membrane filter, 14, second water outlet pipe, 15, stirring shaft, 16, stirring rod, 17, measuring instrument probe, 18, second water level sensor, 19, first water level sensor. DETAILED DESCRIPTION

[0028] In order to better understand the technical content of the present application, specific embodiments are provided below, and the present application is further described in conjunction with the drawings.

[0029] Referring to Figs. 1-2 A gradient separation device for nutrient solution purification, comprising a controller and four groups of series dilution filtration assemblies, the dilution filtration assembly comprising two dilution barrels 4 and a membrane filter 13.

[0030] Preferably, the dilution barrel 4 is a round barrel.

[0031] The upper part of the sidewall of the two dilution barrels 4 is communicated through a communication pipe 9, and a liquid supplement pipe 5 is connected to the dilution barrel 4, a flow pump 6 is arranged on the liquid supplement pipe 5, a stirring part is arranged in the dilution barrel 4, and a driving part for driving the stirring part is further arranged outside the dilution barrel 4.

[0032] Specifically, the stirring part comprises a stirring shaft 15 and a stirring rod 16, the upper end of the stirring shaft 15 is rotatably arranged in the top wall of the dilution barrel 4 and extends upward to be connected with the driving part, the lower end of the stirring shaft 15 extends downward to the middle-lower part of the dilution barrel 4, and the stirring rod 16 is arranged on the sidewall of the stirring shaft 15.

[0033] Specifically, the driving part is a stirring motor 7, and the upper end of the stirring shaft 15 is connected with the output end of the stirring motor 7.

[0034] A pH salinity measuring instrument 8 is further arranged outside the dilution barrel 4, and a measuring instrument probe 17 of the pH salinity measuring instrument 8 extends into the bottom of the dilution barrel 4.

[0035] The sidewall of one dilution barrel 4 is connected with a water inlet pipe 1, the sidewall of the other dilution barrel 4 is provided with a first water level sensor 19 and a second water level sensor 18, and the bottom of the other dilution barrel 4 is connected with a first water outlet pipe 10, the first water level sensor 19 is lower than the second water level sensor 18 and higher than the first water outlet pipe 10.

[0036] Preferably, the height of the second water level sensor 18 is arranged in the range of the height of the pipe opening of the communication pipe 9.

[0037] Preferably, the height of the first water level sensor 19 is arranged at 2-5 cm above the pipe opening of the first water outlet pipe 10.

[0038] The first water outlet pipe 10 is connected with the water inlet end of the membrane filter 13, and a second water pump 12 and a second electric valve 11 are arranged on the first water outlet pipe 10.

[0039] The water outlet end of the membrane filter 13 is connected with a second water outlet pipe 14, and the previous group of dilution filtration assemblies is connected to the water inlet pipe 1 of the adjacent next group of dilution filtration assemblies through the second water outlet pipe 14.

[0040] The filter pore size of the membrane filter 13 in the four groups of dilution filtration assemblies in series decreases from front to back. That is, the filter pore size of the membrane filter 13 in the first group is greater than the filter pore size of the membrane filter 13 in the second group, the filter pore size of the membrane filter 13 in the second group is greater than the filter pore size of the membrane filter 13 in the third group, and the filter pore size of the membrane filter 13 in the third group is greater than the filter pore size of the membrane filter 13 in the fourth group.

[0041] The first water pump 2 and the first electric valve 3 are arranged on the water inlet pipe 1 of the dilution barrel 4 at the front end of the series, that is, the first water pump 2 and the first electric valve 3 are arranged on the water inlet pipe 1 of the dilution barrel 4 of the first group of dilution filtration assemblies.

[0042] Preferably, the controller adopts an STM32 single-chip microcomputer or a SMART200 PLC controller.

[0043] The first water pump 2, the second water pump 12, the first electric valve 3, the second electric valve 11, the first water level sensor 19, the second water level sensor 18, the flow pump 6, the driving component and the pH salinity measuring instrument 8 are electrically connected with the controller.

[0044] The working principle of the utility model is as follows:

[0045] In order to better understand the use process of the device, the following will be illustrated by taking a specific actual use process as an example.

[0046] Firstly, the water inlet pipe 1 of the first group of dilution filtration assemblies is connected to the water supply of the wastewater. (The first dilution barrel 4 is connected to the water inlet pipe 1 by default, and the second dilution barrel 4 is connected to the first water outlet pipe 10), during initial operation, a certain amount of clean water is added to the first dilution barrel 4 of the first group, and at the same time, the flow pump 6 in the first dilution barrel 4 continuously injects clean water. The first water pump 2 and the first electric valve 3 are in an open state, the wastewater is pumped into the first dilution barrel 4 for dilution, and when the wastewater in the first dilution barrel 4 reaches the height of the communication pipe 9, the wastewater overflows into the second dilution barrel 4 through the communication pipe 9, and when the second water level sensor 18 detects the water level and the measuring instrument probe 17 in the second dilution barrel 4 detects that the pH value and the salinity value meet the standard (the initial addition of clean water is to meet the standard, forming the first continuous operation), the second water pump 12 and the second electric valve 11 are opened, the wastewater is pumped into the membrane filter 13 for filtration, separation and purification, and the purified liquid enters the water inlet pipe 1 of the next group of dilution filtration assemblies through the second water outlet pipe 14.

[0047] The operation of the next dilution filtration assembly is the same as above. When the second water level sensor 18 detects the water level and the pH value and salinity value detected by the probe 17 in the second dilution tank 4 meet the standard, the second water pump 12 and the second electric valve 11 are opened. In this way, the initial operation is completed until the purified liquid is discharged from the membrane filter 13 of the last dilution filtration assembly. The monitoring process is started by the controller.

[0048] Under the monitoring process, when the first water level sensor 19 of the first dilution filtration assembly detects that the water level in the second dilution tank 4 is lower than the first water level sensor 19, the second water pump 12 and the second electric valve 11 are closed, and the first electric valve 3 in the second dilution filtration assembly is also closed to prevent backflow. Until the second water level sensor 18 detects the water level and the probe 17 in the second dilution tank 4 detects that the pH value and salinity value meet the standard, the second water pump 12, the second electric valve 11, and the first electric valve 3 in the next dilution filtration assembly are opened again to fill water in the first dilution tank 4 of the next dilution filtration assembly.

[0049] When the water level in the second dilution tank 4 of the second dilution filtration assembly is too low, the second water pump 12 and the second electric valve 11 of the second dilution filtration assembly are closed, and the first electric valve 3 of the third dilution filtration assembly is closed. This is followed by the subsequent.

[0050] When the probe 17 in the second dilution tank 4 of the first dilution filtration assembly detects that the pH value and salinity value do not meet the standard, the first water pump 2, the second water pump 12, the first electric valve 3, and the second electric valve 11 of the first dilution filtration assembly are closed, and the first electric valve 3 of the second dilution filtration assembly is also closed. The two flow pumps 6 of the first dilution filtration assembly are started to simultaneously inject clean water into the two dilution tanks 4, and the drive components of the two dilution tanks 4 are started to drive the stirring components in the dilution tanks 4 to stir. When the probe 17 in the two dilution tanks 4 detects that the pH value and salinity value of the wastewater in the two dilution tanks 4 meet the standard, and the second water level sensor 18 detects the water level, the first water pump 2, the second water pump 12, the first electric valve 3, and the second electric valve 11 of the first dilution filtration assembly are opened again.

[0051] When the pH value and salinity value detected by the measuring instrument probe 17 in the second dilution barrel 4 of the second group do not meet the requirements, the first electric valve 3, the second water pump 12 and the second electric valve 11 are closed at the same time, the first electric valve 3 of the third group is closed at the same time, the first water pump 2, the first electric valve 3, the second water pump 12 and the second electric valve 11 of the first group are closed at the same time. The two flow pumps 6 of the second group start to inject clean water into the two dilution barrels 4 at the same time, and the driving parts of the two dilution barrels 4 are started at the same time to drive the stirring parts in the dilution barrels 4 to stir. When the pH value and salinity value of the wastewater in the two dilution barrels 4 detected by the measuring instrument probe 17 meet the requirements, and the water level detected by the second water level sensor 18, all the water pumps and valves closed before are opened at the same time.

[0052] That is, when the pH value and salinity value of the wastewater in the subsequent second, third and fourth groups except the first group exceed the requirements, all the groups before the exceeding group stop running, and the first electric valve 3 adjacent to the exceeding group is closed.

[0053] The device is provided with the communication pipe 9 located at the middle upper part of the side wall of the dilution barrel 4, so that the dilution barrel 4 at the upper end of the communication pipe 9 still has space, and the flow pump 6 can inject clean water for dilution.

[0054] The device can effectively combine the two links of wastewater dilution and membrane gradient separation. When the membrane filter 13 is filled with liquid each time, the liquid is detected and diluted at an appropriate time, so that the wastewater is automatically diluted and filtered, thereby improving the separation efficiency, reducing the production cost, and better realizing the resource utilization of the liquor brewing wastewater.

[0055] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gradient separation device for nutrient solution purification, characterized in that: The system includes a controller and multiple sets of series-connected dilution and filtration assemblies. Each dilution and filtration assembly comprises two dilution tanks and a membrane filter. The upper and middle parts of the side walls of the two dilution tanks are connected by a connecting pipe. A replenishment pipe is connected to each dilution tank, and a flow pump is installed on the replenishment pipe. A stirring component is installed inside each dilution tank, and a driving component for driving the stirring component is also installed outside the dilution tank. A pH / salinity meter is also installed outside the dilution tank, with its probe extending into the bottom of the dilution tank. A water inlet pipe is connected to the bottom of the side wall of one dilution tank, and a first water level sensor and a second water level sensor are installed on the side wall of the other dilution tank, with a first water outlet pipe connected to its bottom. The first water level sensor is lower than the second water level sensor but higher than the first water outlet pipe. The system consists of a first outlet pipe connected to the inlet of a membrane filter, a second water pump and a second electric valve on the first outlet pipe, and a second outlet pipe connected to the outlet of the membrane filter. The preceding dilution filter assembly is connected to the inlet pipe of the adjacent following dilution filter assembly via the second outlet pipe. The filtration aperture of the membrane filters in the series of dilution filter assemblies decreases sequentially from front to back. The inlet pipe of the dilution tank of the dilution filter assembly at the front of the series is equipped with a first water pump and a first electric valve. The first water pump, the second water pump, the first electric valve, the second electric valve, the first water level sensor, the second water level sensor, the flow pump, the drive component, and the pH and salinity meter are all electrically connected to the controller.

2. The gradient separation device for nutrient solution purification according to claim 1, characterized in that: The stirring component includes a stirring shaft and a stirring rod. The upper end of the stirring shaft is rotatably inserted into the top wall of the dilution tank and extends upward to engage with the driving component. The lower end of the stirring shaft extends downward to the lower middle part of the dilution tank. The stirring rod is located on the side wall of the stirring shaft.

3. A gradient separation device for nutrient solution purification according to claim 2, characterized in that: The driving component is a stirring motor, and the upper end of the stirring shaft is connected to the output drive of the stirring motor.

4. A gradient separation device for nutrient solution purification according to claim 1, characterized in that: The second water level sensor is positioned above the opening of the connecting pipe.

5. A gradient separation device for nutrient solution purification according to claim 4, characterized in that: The height of the second water level sensor is set within the height range of the inlet of the connecting pipe.

6. A gradient separation device for nutrient solution purification according to claim 1, characterized in that: The dilution tank is a round barrel.

7. A gradient separation device for nutrient solution purification according to claim 1, characterized in that: The dilution filtration assembly consists of at least three sets.

8. A gradient separation device for nutrient solution purification according to claim 5, characterized in that: The first water level sensor is positioned 2-5 centimeters above the opening of the first water outlet pipe.

9. A gradient separation device for nutrient solution purification according to any one of claims 1-8, characterized in that: The maximum water flow rate of the first water pump is less than the maximum water flow rate of the second water pump.

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