CN210752123U - Biogas slurry concentration process device based on membrane separation - Google Patents
Biogas slurry concentration process device based on membrane separation Download PDFInfo
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- CN210752123U CN210752123U CN201920793450.9U CN201920793450U CN210752123U CN 210752123 U CN210752123 U CN 210752123U CN 201920793450 U CN201920793450 U CN 201920793450U CN 210752123 U CN210752123 U CN 210752123U
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Abstract
The utility model relates to a biogas slurry concentration process unit based on membrane separation, which comprises a primary filtering system for coarse filtration of biogas slurry, an ultrafiltration system for ultrafiltration treatment of biogas slurry and a reverse osmosis membrane system for reverse osmosis treatment of biogas slurry, which are connected in sequence through pipelines according to the flow direction of biogas slurry; the coarse filtering system comprises at least two stages of coarse filters which are connected in sequence and adopt physical filtering; the ultrafiltration system comprises at least two stages of fine filters and an ultrafiltration membrane system which are connected in sequence and adopt physical filtration; the reverse osmosis membrane system comprises at least one stage of cartridge filter and a reverse osmosis membrane system which are connected in sequence. Through adopting multistage physical filtration mode of multistage, throwing not throwing chemical agent at natural pond liquid treatment process, concentrated back natural pond liquid is not disturbed by chemical agent, has solved the problem that ultrafiltration membrane system easily takes place to block up, improves the life of membrane module to when obtaining the concentrate that accords with the standard, the obtained clear liquid is used for backwash and chemical cleaning, improves the utilization ratio of natural pond liquid, has practiced thrift a large amount of fresh water resources.
Description
Technical Field
The utility model belongs to the technical field of natural pond liquid is handled, specifically be a concentrated process units of natural pond liquid based on membrane separation.
Background
The biogas slurry is used as an excellent organic fertilizer, can replace or partially replace chemical fertilizers on the basis of ensuring the yield increase and high quality of crops, and can be used as a base fertilizer, an additional fertilizer or a leaf fertilizer. A large number of experiments prove that the biogas slurry is a high-quality and full-effect organic fertilizer. However, the nutrient content of the biogas slurry is low, and more than 95% of the nutrient content is water, so that the biogas slurry is always used for agricultural production and is not commercially produced so far. With the development of membrane technology, the biogas slurry membrane concentration technology will also develop opportunities.
The biogas slurry concentration aims at improving the synergistic value of the biogas slurry, recycling the biogas slurry and solving the problem of biogas slurry pollution. The concentration of biogas slurry and the subsequent production of liquid organic fertilizer are new problems for solving the problem of biogas slurry pollution in recent years. The concentrated biogas slurry has the advantages of reduced volume, convenient storage and transportation, new economic benefit brought for biogas engineering, new activity, capability of slowing down environmental pollution, high-quality fertilizer resource acquisition and further promotion of the whole industrialization development of the biogas slurry.
The existing biogas slurry concentration device has the problems of high energy consumption, complex equipment, large chemical agent addition amount and easy membrane blockage, so that the problems of serious chemical agent pollution of a biogas slurry concentration product, easy membrane blockage, short membrane service life, high use cost and the like are caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a concentrated process units of natural pond liquid based on membrane separation to solve the problem that current natural pond liquid membrane concentrator energy consumption is higher, equipment is complicated, the chemical agent addition is big, the membrane easily blocks up.
In order to solve the above problem, the technical scheme of the utility model is as follows:
firstly, the utility model relates to a concentrated process units of natural pond liquid based on membrane separation, its design and natural pond liquid treatment mode follow following natural pond liquid membrane treatment method:
a biogas slurry concentration method based on membrane separation comprises the following steps:
(1) pretreatment: coarsely filtering the biogas slurry to remove large granular solid matters, and obtaining coarsely filtered biogas slurry;
(2) and (3) ultrafiltration treatment: after the coarse filtration biogas slurry is subjected to fine filtration and then is treated by an ultrafiltration membrane, the permeate obtained at the permeation side of the ultrafiltration membrane enters the next procedure, and the concentrated water obtained at the non-permeation side of the ultrafiltration membrane flows back and is mixed with the coarse filtration biogas slurry for circulation ultrafiltration treatment;
(3) reverse osmosis treatment: after the permeate is filtered by security and treated by a reverse osmosis membrane, obtaining clear liquid at the osmosis side of the reverse osmosis membrane and concentrated liquid at the non-osmosis side of the reverse osmosis membrane; when the density of the obtained concentrated solution reaches a certain value, outputting the concentrated solution to obtain a concentrated solution; when the density of the obtained concentrated solution is less than a certain value, the concentrated solution is refluxed, filtered by security guard and treated by a reverse osmosis membrane in a circulating way until the density of the concentrated solution reaches a certain value, and then the concentrated solution is taken as the concentrated solution to be output.
Wherein, in order to ensure the biogas slurry treatment capacity in unit time, the ultrafiltration membrane used in the ultrafiltration treatment process is generally an ultrafiltration membrane system consisting of a plurality of groups of ultrafiltration membranes; in the reverse osmosis treatment process, the reverse osmosis membrane used is generally a reverse osmosis membrane system consisting of a plurality of groups of reverse osmosis membranes. The main structures of the ultrafiltration membrane system and the reverse osmosis membrane system are consistent with those of the existing corresponding system, and the adjustment is only made on the unit size and the membrane material selection according to the biogas slurry treatment characteristics; the adjustment mode of the unit size is determined by technicians according to the treatment flow and the treatment pressure by referring to the prior art, and the selection of the membrane material is described in detail in the following description of the preferred schemes of the ultrafiltration membrane and the reverse osmosis membrane. Meanwhile, in order to ensure that the biogas slurry can be conveyed step by step and has sufficient pressure, a plurality of suitable pumps are required to be added to the pipeline in the treatment process to convey the biogas slurry, and the position of each pump is set so as to ensure that the pressure of the treated liquid such as the biogas slurry in the pipeline is maintained at about 0.3 MPa.
In step 3, whether the concentrate obtained from the non-permeation side of the reverse osmosis membrane is discharged as the concentrate is determined by the density of the concentrate, and the density is usually determined by a skilled person according to the biogas slurry concentration multiple required in the actual engineering. For example, when the concentration ratio of the concentrate to the biogas slurry raw material is required to be 2 times, the density of the concentrate is usually 1.008g/cm3Then the concentrated solution can be output; when the required concentration factor is 3 times, the density of the concentrated solution is 1.008g/cm3Then the concentrated solution can be output; when the concentration ratio is 4 times, the density of the concentrate is usually 1.020g/cm3Then the concentrated solution can be output; when the concentration ratio is required to be 5 times, the concentration ratio is usually 1.023g/cm3And the concentrated solution can be output.
Further, in step 1, the coarse filtration comprises at least two stages of physical coarse filtration.
Further, the coarse filtration consists of primary coarse filtration and secondary coarse filtration; the filtering precision of the primary coarse filtering is 100 mu m, and the filtering precision of the secondary coarse filtering is 50-70 mu m.
Further, the primary coarse filtration is plate-frame filtration, and can be realized by a plate-frame filter; the second-stage coarse filtration is fiber bundle filtration, and can be realized by specifically selecting a fiber bundle filter.
Further, in step 2, the fine filtration comprises at least two stages of physical fine filtration.
Furthermore, the fine filtration consists of primary fine filtration and secondary fine filtration; the filtration precision of the first-stage fine filtration is 50 μm, and the filtration precision of the second-stage fine filtration is 5 μm.
Further, the primary fine filtration is bag filtration, and can be realized by a bag filter; the second-stage fine filtration is fine filtration, and can be realized by a fine filter.
Further, in the step 2, the ultrafiltration membrane is made of PVDF, and the pore diameter is 0.002-0.01 μm; the membrane flux is generally 50L/m2The value of/h is taken, or model selection calculation is carried out according to the actual water quality of a demand factory; besides the preferred PVDF, the ultrafiltration membrane may be made of PE, PP, PVC, PES or PAN.
Further, in step 3, the filtering precision of the cartridge filter is 5 μm, and the cartridge filter is usually implemented. The safety filter belongs to one of precision filters and is a commonly used protective device before liquid enters a membrane in membrane purification treatment; the method has the effects of removing impurities contained in the liquid entering the reverse osmosis membrane system and preventing the reverse osmosis membrane from being damaged by the impurities, thereby achieving the purpose of protecting the reverse osmosis membrane system.
Further, in step 3, the reverse osmosis membrane is made of cellulose acetate, polyamide, or a composite material based on cellulose acetate or polyamide; the aperture of the reverse osmosis membrane is 0.0004-0.0006 mu m; the membrane flux is generally 20L/m2And/h value taking, or model selection calculation according to the actual water quality of a demand factory.
Further, the pretreated crude filtered biogas slurry enters a filter water tank for caching and then is pumped for ultrafiltration treatment; and the concentrated water obtained from the non-permeation side of the ultrafiltration membrane reflows to the filter water tank to be mixed with the crude filtered biogas slurry and is pumped again for ultrafiltration treatment. In short, a filtering water tank is added between the pretreatment and the ultrafiltration treatment for buffer storage of the crude filtering biogas slurry and buffer mixing of the crude filtering biogas slurry and the non-permeate obtained by the reflux ultrafiltration treatment. Through the arrangement of the filter water tank, the difference between the coarse filtration rate of the pretreatment stage and the treatment capacity of ultrafiltration treatment in unit time can be coordinated, so that the shock resistance of the whole treatment method is improved, the isolation among the procedures is allowed, the independent overhaul and maintenance of the equipment used in the procedures are facilitated, and the fault tolerance rate and the reliability of the whole treatment system are improved. In addition, through the buffering of filtration water tank for the backward flow gets ultrafiltration treatment gained non-permeate liquid, and dense water has abundant space and time promptly and comes from the coarse filtration natural pond liquid intensive mixing of pretreatment systems, with the even degree that improves between the two, thereby be convenient for ultrafiltration treatment still can carry out relative homogeneity and handle after having dense water backward flow operation, and then guaranteed ultrafiltration treatment's work efficiency and processing reliability.
Further, the permeate obtained after ultrafiltration firstly enters a permeate water tank for caching and then is used for reverse osmosis treatment in a pump; when the concentrated solution obtained from the non-permeation side of the reverse osmosis membrane can not be output as the concentrated solution, the concentrated solution flows back to the permeate water tank and is pumped for reverse osmosis treatment, and circulation is performed by taking the reverse osmosis treatment as circulation until the concentrated solution can be output as the concentrated solution. In short, a permeate water tank is additionally arranged between the ultrafiltration treatment and the reverse osmosis treatment, and is used for buffer storage of permeate obtained by the ultrafiltration treatment, buffer mixing of permeate obtained by the ultrafiltration treatment and non-permeate obtained by the reverse osmosis treatment in backflow, and buffer storage of the non-permeate obtained by the reverse osmosis treatment only when the circulating reverse osmosis concentration treatment is carried out. Through the arrangement of the permeate liquid water tank, the difference between the treatment capacity per unit time of ultrafiltration treatment and reverse osmosis treatment can be coordinated, so that the impact resistance of the whole treatment method is improved, the isolation among the working procedures is allowed, the independent overhaul and maintenance of the equipment used in each working procedure are facilitated, and the fault tolerance rate and the reliability of the whole treatment system are improved. In addition, non-permeate liquid obtained by ultrafiltration treatment is obtained by backflow through buffering of the permeate liquid water tank, namely, concentrated water has sufficient space and time and is fully mixed with the coarse filtration biogas slurry from the pretreatment system, so that the uniform degree of mixing between the concentrated water and the coarse filtration biogas slurry is improved, the ultrafiltration treatment can still be relatively homogenized after the concentrated water backflow operation is carried out, and the working efficiency and the treatment reliability of the ultrafiltration treatment are further ensured; and, can make reverse osmosis membrane system and its pipeline constitute closed circuit through the permeate liquid water tank to allow the concentrate to circulate concentrated the processing in this closed circuit, with the output concentration standard that reaches the concentrate fast, and then guaranteed the output quality of concentrate.
Furthermore, the ultrafiltration treatment and the reverse osmosis treatment are both provided with a backwashing procedure for reversely flushing the ultrafiltration membrane or/and the reverse osmosis membrane.
Further, the backwashing step at least comprises water washing; the water wash is carried out every up to 30 min.
Still further, the backwashing process consists of water washing and chemical washing which are connected in parallel; when the water inlet pressure of the ultrafiltration membrane or/and the reverse osmosis membrane is larger than a preset value, the reverse washing of the ultrafiltration membrane or/and the reverse osmosis membrane is carried out by using chemical washing instead of water washing, and after the chemical washing, the ultrafiltration membrane or/and the reverse osmosis membrane is washed by clean water and then can be fed to the ultrafiltration membrane or/and the reverse osmosis membrane.
Further, the chemical cleaning is respectively carried out by adopting a sodium hydroxide solution and a citric acid solution; and (3) preparing the sodium hydroxide solution and the citric acid solution by using the clear liquid obtained at the permeation side of the reverse osmosis membrane in the step (3), wherein the concentration of the sodium hydroxide solution is 0.1 wt%, and the concentration of the citric acid solution is 1-2 wt%.
Further, the water for backwashing used for washing is clear liquid obtained on the permeate side of the reverse osmosis membrane in step 3.
Further, in the step 3, the clear liquid obtained from the permeation side of the reverse osmosis membrane is used for washing livestock houses after being disinfected, or is directly discharged, or is used for landscape water.
Furthermore, before entering the pretreatment process, the biogas slurry is naturally settled and then pumped for the pretreatment process. By preceding in advance of
Based on the technical scheme, as a further improvement scheme, the membrane separation-based biogas slurry concentration method adopts industrial automation control, and the control method specifically comprises the following steps:
in the pretreatment process, a pump for pumping biogas slurry to pass through primary coarse filtration and secondary coarse filtration and a valve for controlling the opening and closing of a pipeline are controlled by a PLC (programmable logic controller);
in the ultrafiltration treatment process, a pump for pumping the coarse filtration biogas slurry to pass through a primary fine filtration system, a secondary fine filtration system and an ultrafiltration membrane system, a pump for controlling the backflow of non-permeate liquid, and valves for controlling the opening and closing of pipelines among all stages are controlled by a PLC.
In the reverse osmosis treatment process, a pump for pumping the permeate liquid through a security filtration and reverse osmosis membrane system, a pump for controlling the backflow of the concentrated liquid obtained at the non-osmosis side, a pump for outputting qualified concentrated liquid, a pump for outputting clear liquid obtained at the osmosis side and valves for opening and closing pipelines among the stages are controlled by a PLC. Furthermore, the water outlet ends of the concentrated solution and the clear solution of the reverse osmosis membrane system are provided with a pressure meter and a flowmeter for acquiring pressure and flow information, and the water outlet end of the concentrated solution is also provided with an online density detector for detecting the density of the concentrated solution; when the density of the concentrated solution meets the concentrated solution output density requirement, a valve on a pipeline for conveying the concentrated solution to a concentrated solution storage tank is automatically opened through PLC control, and qualified concentrated solution flows to the concentrated solution storage tank and is reserved for further blending to prepare fertilizer; once the density of the concentrated solution is lower than the output concentration requirement of the concentrated solution, the valve is closed, a pump for refluxing the concentrated solution is opened, the concentrated solution is refluxed and is circularly concentrated in the reverse osmosis treatment process until the density reaches the standard, the valve is opened again, and the concentrated solution with the standard concentration is output to a concentrated solution storage tank as the concentrated solution. No matter the concentrated solution is directly discharged or discharged after circular concentration, the clear solution obtained at the permeation side of the reverse osmosis membrane system is controlled by a PLC and is output by a pump for use.
Meanwhile, at least one pressure gauge is arranged on the pipeline between each part of each stage and is used for monitoring the pipeline pressure in cooperation with the PLC, so that the pumping power and the pressure-related process parameters are automatically controlled.
More preferably, when the biogas slurry concentration method is additionally provided with a water washing step or/and a chemical cleaning step, the pumps for pumping the reverse osmosis membrane penetrating fluid for back flushing and pumping the solution for chemical cleaning are controlled by a PLC.
The above PLC control can be performed by adopting a unified PLC control system. Technicians set preset values according to process parameters such as time, pressure, concentration and the like, and the PLC automatically determines the starting and stopping and power of each pump and the opening and closing strategy of each valve in a processing system according to the pressure value generated by a pressure gauge on each pipeline and the comparison between data fed back by a linear density detector and the preset values in the processing process so as to finally achieve the purpose of processing automatic control.
Under the above-mentioned concentrated method of natural pond liquid based on membrane separation and preferred scheme's thinking, the utility model discloses provide a concentrated process units of natural pond liquid based on membrane separation that can solve the present processing apparatus problem emphatically, it specifically as follows:
a biogas slurry concentration process device based on membrane separation comprises a primary filtration system, an ultrafiltration system and a reverse osmosis membrane system, wherein the primary filtration system is used for coarse filtration of biogas slurry, the ultrafiltration system is used for ultrafiltration treatment of biogas slurry, and the reverse osmosis membrane system is used for reverse osmosis treatment of biogas slurry; the coarse filtration system comprises at least two stages of coarse filters which are connected in sequence through pipelines and adopt physical filtration; the ultrafiltration system comprises at least two stages of fine filters and an ultrafiltration membrane system which are connected in sequence and adopt physical filtration; the reverse osmosis membrane system comprises at least one stage of security filter and a reverse osmosis membrane system which are sequentially connected through a pipeline.
Furthermore, the coarse filtration system consists of two stages of coarse filters, namely a first-stage coarse filter and a second-stage coarse filter in sequence; the filtering precision of the first-stage coarse filter is 100 micrometers, and the filtering precision of the second-stage coarse filter is 50-70 micrometers.
Furthermore, the first-stage coarse filter is a plate-frame filter, and the second-stage coarse filter is a fiber bundle filter.
Furthermore, the fine filter contained in the ultrafiltration system is in two stages, namely a first-stage fine filter and a second-stage fine filter; the filtering precision of the first-stage fine filter is 50 micrometers, and the filtering precision of the second-stage fine filter is 5 micrometers.
Furthermore, an intermediate water tank is arranged on a pipeline between the primary coarse filter and the secondary coarse filter.
Still further, the pipelines in the biogas slurry pool and the middle water pool are respectively provided with a first water pump (2) and a second water pump (5).
Still further, a check valve (6) is arranged on a pipeline between the middle water tank and the secondary coarse filter.
Furthermore, the first-stage fine filter is a bag filter, and the second-stage fine filter is a precision filter.
Furthermore, a filtering water tank is arranged on a pipeline between the coarse filtering system and the ultrafiltration system, and an ultrafiltration raw water pump is arranged between the filtering water tank and the ultrafiltration system; a permeate water tank is arranged on a pipeline between the ultrafiltration system and the reverse osmosis membrane system; a booster pump is arranged on a pipeline between the permeate liquid water tank and the cartridge filter; and a high-pressure pump is arranged between the cartridge filter and the reverse osmosis membrane system.
Furthermore, the biogas slurry concentration process device based on membrane separation also comprises a backwashing system: the backwashing system is respectively connected with the ultrafiltration system and the reverse osmosis membrane system through pipelines.
Still further, the backwashing system comprises a cleaning filter, a clear water tank and a chemical cleaning medicine box which are connected through pipelines, the clear water tank and the chemical cleaning medicine box are arranged in parallel, and a backwashing pump is arranged on the pipeline between the cleaning filter and the clear water tank as well as between the cleaning filter and the chemical cleaning medicine box; and the clear water outlet end of the reverse osmosis membrane system is respectively connected with the clear water tank and the chemical cleaning chemical tank through clear water pipelines.
Furthermore, a backflow pipeline is arranged between the concentrated water outlet end of the ultrafiltration system and the filtration water tank, and the clear water outlet end of the ultrafiltration system is connected with the permeate water tank through a pipeline.
Furthermore, a first electric valve is arranged on a pipeline between the filtering water tank and the ultrafiltration system, a second electric valve is arranged on a pipeline between the cleaning filter and the ultrafiltration system, a third electric valve is arranged on a return pipeline, a fourth electric valve is arranged on a pipeline between the chemical cleaning medicine box and the ultrafiltration system, a sixth electric valve is arranged on a pipeline between the chemical cleaning medicine box and the permeate liquid water tank, a fifth electric valve is arranged on a pipeline between the ultrafiltration system and the permeate liquid water tank, a seventh electric valve is arranged on a pipeline between the cleaning filter and the permeate liquid water tank, and an eighth electric valve is arranged on a pipeline at the inlet of the concentrated liquid storage tank.
Furthermore, a high-low pressure protection device and an electric slow-opening valve are mounted on a pipeline at the outlet of the high-pressure pump, and the high-pressure pump is controlled by frequency conversion.
Furthermore, a concentrated solution storage tank is connected to a concentrated solution outlet end of the reverse osmosis membrane system; a pressure gauge, a flowmeter, an online density detector, a concentrated liquid pump and a control valve are arranged on a pipeline between the reverse osmosis membrane system and the concentrated liquid storage tank, and a concentrated liquid return pipe is arranged on a pipeline in front of the control valve; the concentrated solution return pipe is communicated with the permeate solution water tank.
Compared with the prior art, the beneficial effects of the utility model are as follows:
(1) the utility model provides a biogas slurry concentration process device based on membrane separation, which adopts three-stage physical filtration modes such as a plate-and-frame filter press, a fiber bundle filter, a bag filter and a security filter in sequence in the biogas slurry treatment process, and the filtration precision is improved step by step; in the process, no chemical agent is added, and the concentrated biogas slurry is not interfered by the chemical agent, so that the problem that an ultrafiltration membrane system is easy to block is solved, and the service life of the membrane component is prolonged; in addition, concentrated solution obtained by the ultrafiltration membrane system and the reverse osmosis concentration system is subjected to multiple times of circulating treatment to obtain concentrated solution meeting the standard, and meanwhile, the permeate obtained by the ultrafiltration membrane system and the reverse osmosis concentration system is used for backwashing and chemical cleaning, so that the utilization rate of the biogas slurry is improved, a large amount of fresh water resources are saved, and the economic and environmental benefits of biogas slurry fermentation engineering are greatly improved.
(2) The utility model discloses adopt the two-stage to filter among the primary filtration system, the filter fineness increases in proper order for coarse filtration effect improves greatly, has fully alleviateed follow-up concentrated pressure of filtering, has further guaranteed the reliability of ultrafiltration system and reverse osmosis membrane system.
(3) The utility model discloses well adoption tow filter replaces quartz sand filter, and the filter effect improves greatly, solves the problem that sand filter ran the sand easily.
(4) And whether the reverse osmosis concentrated solution is qualified or not is monitored by combining concentrated water side pressure control and concentrated solution density control, so that the concentration multiple of 5-10 times of the concentrated solution is ensured.
Description of the drawings:
the present invention will be described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is a process flow chart adopted by the biogas slurry concentration process device based on membrane separation provided by the utility model;
fig. 2 is a schematic structural diagram of the biogas slurry concentration process device based on membrane separation provided by the utility model.
Reference numerals: 1-a biogas liquid pool, 2-a first water pump, 3-a first-stage coarse filter, 4-an intermediate water pool, 5-a second water pump, 6-a check valve, 7-a second-stage coarse filter, 8-a filtering water tank, 9-an ultrafiltration raw water pump, 10-a bag filter, 11-a precision filter, 12-an ultrafiltration system, 13-a permeate water tank, 14-a booster pump, 15-a security filter, 16-a high-pressure pump, 17-a reverse osmosis membrane system, 18-a clear water tank, 19-a backwashing pump, 20-a cleaning filter, 21-a chemical cleaning medicine box, 22-a concentrate storage tank, 23-a concentrate pump, 24-a first electric valve, 25-a second electric valve, 26-a third electric valve, 27-a fourth electric valve and 28-a fifth electric valve, 29-a sixth electric valve, 30-a seventh electric valve, 31-a pressure gauge, 32-an online density detector, 33-a flow meter, 34-an eighth electric valve, 35-a clear liquid pipeline and 36-a reflux pipeline.
Detailed Description
The invention will be further elucidated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope defined in the present application.
Examples
In the following, a preferred embodiment will be described as a method for concentrating biogas slurry based on membrane separation in the present technical solution, and the method for concentrating biogas slurry as a preferred embodiment mainly includes the following steps:
(1) collecting biogas slurry: discharging the biogas slurry fermented by the anaerobic fermentation tank to a biogas slurry tank, wherein the Chemical Oxygen Demand (COD) of the biogas slurry after anaerobic fermentation is 3000-plus 5000mg/L, the content of ammonia nitrogen elements is 900-plus 1200mg/L, naturally settling the fermented biogas slurry in the biogas slurry tank, preliminarily removing particles such as biogas residues carried by the biogas slurry, and subsequently completing the concentration of organic matters, ammonia nitrogen (nitrogen elements) and other nutrient substances.
(2) Biogas slurry pretreatment: and (3) conveying the biogas slurry in the biogas slurry pool to a plate-and-frame filter press (with the filtering precision of 100 micrometers) and a fiber bundle filter (with the filtering precision of 50-70 micrometers) in sequence through a conveying pump, and removing large-particle solid matters.
(3) And (3) coarse filtration biogas slurry caching: the filtered water of the fiber bundle filter enters a filter water tank as a water inlet tank of the ultrafiltration membrane system.
(4) And (3) ultrafiltration treatment: the biogas slurry in the filter water tank is sequentially pressurized to pass through a bag filter and a precision filter and then enters an ultrafiltration membrane system, wherein the filtering precision of the bag filter is 50 microns, the filtering precision of the precision filter is 5 microns, and the precision of the security filter is 5 microns. And (3) enabling permeate of the ultrafiltration membrane system to enter a permeate water tank as reverse osmosis inlet water, enabling concentrated water to flow back to the front end filtering water tank, and continuously performing circulating concentration.
(5) Reverse osmosis treatment: and (3) pressurizing the reverse osmosis inlet water, conveying the pressurized reverse osmosis inlet water into a security filter, conveying the pressurized reverse osmosis inlet water into a reverse osmosis membrane system through a high-pressure pump, mixing the concentrated solution after the reverse osmosis membrane treatment according to different proportions to obtain different finished products of concentrated biogas slurry, and recycling the qualified clear solution of the reverse osmosis membrane.
Further, a pressure meter and a flow meter for collecting pressure and flow information are arranged at both the concentrated solution outlet end and the clear solution outlet end of the reverse osmosis membrane system; the concentrated solution outlet end is provided with an online density detector for monitoring the density of the concentrated solution, when the required concentrated solution is qualified, a valve of a pipeline to the concentrated solution storage tank is automatically opened, the qualified concentrated solution is delivered to the concentrated solution storage tank, when the density of the concentrated solution is lower than the set density, the valve is closed, and the concentrated solution is circularly concentrated until the density reaches the standard; clear solution play water end is collected through the clear water tank, and the reverse osmosis membrane permeate liquid in the clear water tank is the backwash water of membrane system, and the reverse osmosis membrane permeate liquid in the backwash pump action clear water tank carries out the backwash through wasing the filter to ultrafiltration membrane system and reverse osmosis membrane system, and surplus water is discharged or is the view water by the gravity flow, and part gets into the chemical cleaning medical kit for dispose the medicament in the chemical cleaning system.
Furthermore, the ultrafiltration membrane system and the reverse osmosis membrane system are both provided with an online backwashing and chemical cleaning system, and the ultrafiltration membrane system and the reverse osmosis membrane system share the cleaning system; wherein, the back flush adopts reverse osmosis to produce water, the system runs for 30 minutes to carry out one-time back flush; the chemical cleaning is respectively carried out by adopting sodium hydroxide solution and citric acid, and reverse osmosis water production is used for preparation; when the control system detects that the water inlet pressure of the membrane module exceeds a set value, an alarm is started, and chemical cleaning is manually carried out at the moment.
Clear water backwashing (namely backwashing) runs through the whole process of biogas slurry concentration, and aims to timely clean pollutants on the surfaces of corresponding membrane assemblies of an ultrafiltration membrane system and a reverse osmosis membrane system and reduce the chemical cleaning frequency, so that the continuity of biogas slurry concentration is ensured, and the treatment efficiency is improved. Whereas chemical cleaning is only performed when the fresh water backwash is ineffective.
The chemical cleaning is respectively carried out by adopting a sodium hydroxide solution and a citric acid solution, the sodium hydroxide solution is firstly used for carrying out alkaline cleaning, then the citric acid solution is used for carrying out acid cleaning, and the circulation is carried out; and (3) preparing the sodium hydroxide solution and the citric acid solution by using the clear liquid obtained at the permeation side of the reverse osmosis membrane in the step (3), wherein the concentration of the sodium hydroxide solution is 0.1 wt%, and the concentration of the citric acid solution is 1-2 wt%.
The chemical cleaning is manual operation and is carried out according to actual conditions, and the time is indefinite. The conditions required for chemical cleaning are:
(1) in the ultrafiltration system, when the water inlet pressure of the system exceeds the initial water inlet pressure of 0.05MPa, the backwashing with high flow of clear water is needed, and if the backwashing is invalid, the chemical cleaning is carried out.
(2) The reverse osmosis system is chemically cleaned when one of the following conditions occurs, namely the ① production is reduced by 10%, the ② pressure is reduced by 15%, the ③ salt permeation rate is increased by 5%, the indexes are monitored by related instruments on line, and operators find that the conditions occur and need to be chemically cleaned.
The specific operation mode of the chemical cleaning is as follows: firstly, circularly displacing raw water and concentrated water in an ultrafiltration membrane system (or a reverse osmosis membrane system) at low flow by using liquid medicine (firstly using a sodium hydroxide solution, then using a citric acid solution, and performing step by step), and finishing circular displacement when the color of discharged water is not changed; then closing an inlet valve and an outlet valve of a corresponding membrane system, soaking the membrane module with the liquid medicine for 2-3 hours, then circulating for 10min, and finally replacing the liquid medicine in the system with clear water until the pH value of a water outlet is close to neutral; the chemical liquid continuously flows back to the chemical cleaning chemical tank in the clear water replacement cycle, specifically, the alkaline cleaning chemical liquid flows back to the alkaline liquid tank, the acid cleaning chemical liquid flows back to the acid cleaning chemical tank, and the replacement clear water flows back to the chemical tank in the previous cleaning step in the process, for example, the acid cleaning is performed finally, and the clear water is replaced and flows back to the acid cleaning chemical tank because the clear water is replaced by the acid liquid. It should be emphasized that, in the chemical cleaning process, the clean water is used for replacement, and the replaced liquid medicine and the replaced clean water both flow back to the corresponding medicine chest, so that the biogas slurry pollution caused by the liquid medicine mixed into the biogas slurry is avoided.
Further, the membrane separation-based biogas slurry concentration method adopts industrial automation control, and the control method specifically comprises the following steps:
in the pretreatment process, a pump for pumping biogas slurry to pass through primary coarse filtration and secondary coarse filtration and a valve for controlling the opening and closing of a pipeline are controlled by a PLC (programmable logic controller);
in the ultrafiltration treatment process, a pump for pumping the coarse filtration biogas slurry to pass through a primary fine filtration system, a secondary fine filtration system and an ultrafiltration membrane system, a pump for controlling the backflow of non-permeate liquid, and valves for controlling the opening and closing of pipelines among all stages are controlled by a PLC.
In the reverse osmosis treatment process, a pump for pumping the permeate liquid through a security filtration and reverse osmosis membrane system, a pump for controlling the backflow of the concentrated liquid obtained at the non-osmosis side, a pump for outputting qualified concentrated liquid, a pump for outputting clear liquid obtained at the osmosis side and valves for opening and closing pipelines among the stages are controlled by a PLC. Furthermore, the water outlet ends of the concentrated solution and the clear solution of the reverse osmosis membrane system are provided with a pressure meter and a flowmeter for acquiring pressure and flow information, and the water outlet end of the concentrated solution is also provided with an online density detector for detecting the density of the concentrated solution; when the density of the concentrated solution meets the concentrated solution output density requirement, a valve on a pipeline for conveying the concentrated solution to a concentrated solution storage tank is automatically opened through PLC control, and qualified concentrated solution flows to the concentrated solution storage tank and is reserved for further blending to prepare fertilizer; once the density of the concentrated solution is lower than the output concentration requirement of the concentrated solution, the valve is closed, a pump for refluxing the concentrated solution is opened, the concentrated solution is refluxed and is circularly concentrated in the reverse osmosis treatment process until the density reaches the standard, the valve is opened again, and the concentrated solution with the standard concentration is output to a concentrated solution storage tank as the concentrated solution. No matter the concentrated solution is directly discharged or discharged after circular concentration, the clear solution obtained at the permeation side of the reverse osmosis membrane system is controlled by a PLC and is output by a pump for use.
Meanwhile, at least one pressure gauge is arranged on the pipeline between each part of each stage and is used for monitoring the pipeline pressure in cooperation with the PLC, so that the pumping power and the pressure-related process parameters are automatically controlled.
More preferably, when the biogas slurry concentration method is additionally provided with a water washing step or/and a chemical cleaning step, the pumps for pumping the reverse osmosis membrane penetrating fluid for back flushing and pumping the solution for chemical cleaning are controlled by a PLC.
The above PLC control can be performed by adopting a unified PLC control system. Technicians set preset values according to process parameters such as time, pressure, concentration and the like, and the PLC automatically determines the starting and stopping and power of each pump and the opening and closing strategy of each valve in a processing system according to the pressure value generated by a pressure gauge on each pipeline and the comparison between data fed back by a linear density detector and the preset values in the processing process so as to finally achieve the purpose of processing automatic control.
The membrane separation-based biogas slurry concentration process device corresponding to the superior membrane separation-based biogas slurry concentration method has the following specific structure:
as shown in fig. 1, a biogas slurry concentration process device based on membrane separation comprises a biogas slurry pool 1, a primary filtration system, a filtration water tank 8, an ultrafiltration system 12, a permeate water tank 13, a reverse osmosis membrane system 17 and a concentrated solution storage tank 22 which are sequentially connected through pipelines; a booster pump 14, a cartridge filter 15 and a high-pressure pump 16 are sequentially arranged on a pipeline between the permeate liquid water tank 13 and the reverse osmosis membrane system 17; and an ultrafiltration raw water pump 9, a bag filter 10 and a precision filter 11 are sequentially arranged on a pipeline between the filtration water tank 8 and the ultrafiltration system 12.
Further, the primary filtration system comprises a primary coarse filter 3, an intermediate water tank 4 and a secondary coarse filter 7.
The working principle is as follows: the biogas slurry is fermented by an anaerobic fermentation tank and then discharged to a biogas slurry tank 1, natural sedimentation is carried out in the biogas slurry tank 1 to primarily remove particles such as biogas residues carried by the biogas slurry, then the biogas slurry in the biogas slurry tank 1 is conveyed to a primary coarse filter 3 by a pump, the biogas slurry after primary coarse filtration enters an intermediate water tank 4 and is conveyed to a secondary coarse filter 7 by the pump, filtered water from the secondary coarse filter 7 enters a filter water tank 8 as a water inlet tank of an ultrafiltration system 12, the biogas slurry in the filter water tank 8 is sequentially pressurized by an ultrafiltration raw water pump 9, passes through a bag filter 10 (with the filter precision of 50 μm) and a precise filter 11 (with the filter precision of 5 μm) and then enters an ultrafiltration system 12, permeate of the ultrafiltration system 12 enters a permeate water tank 13 as reverse osmosis inlet water, the liquid in the permeate water tank 13 is pressurized by a booster pump 14 and enters a cartridge filter 151 with the filter precision of 5 μm) and then is conveyed by, the concentrated water meeting the density requirement in the reverse osmosis membrane system 17 is qualified concentrated solution and goes to a concentrated solution storage tank 22.
Further, the membrane separation-based biogas slurry concentration process device further comprises a backwashing system, and the backwashing system is respectively connected with the ultrafiltration system 12 and the reverse osmosis membrane system 17 through pipelines.
Furthermore, the backwashing system comprises a cleaning filter 20, a clean water tank 18 and a chemical cleaning medicine box 21 which are connected with the cleaning filter 20, wherein the clean water tank 18 and the chemical cleaning medicine box 21 are arranged in parallel, and a backwashing pump 19 is arranged on a pipeline between the cleaning filter 20 and the clean water tank 18 as well as the chemical cleaning medicine box 21; the clear water outlet end of the reverse osmosis membrane system 17 is respectively connected with the clear water tank 18 and the chemical cleaning medicine box 21 through a clear liquid pipeline 35.
Furthermore, a return pipeline 36 is arranged between the concentrated water outlet end of the ultrafiltration system 12 and the filtration water tank 8, and the clear water outlet end of the ultrafiltration system 12 is connected with the clear water tank through a pipeline.
The working principle is as follows: the permeate of the reverse osmosis membrane enters a clear water tank to be used as backwashing water for the membrane system, a backwashing pump 19 automatically operates, backwashing water is used for backwashing the system through a cleaning filter 20, and surplus water is discharged by gravity flow. And partially into the chemical cleaning agent box 21 for dispensing the chemical agent. The permeate liquid can be reused for washing the colony house after being disinfected, can reach the standard for discharge, and can be used as landscape water to enter the artificial wetland.
Furthermore, a first electric valve 24 is arranged on a pipeline between the precision filter 11 and the ultrafiltration system 12, a second electric valve 25 is arranged on a pipeline between the cleaning filter 20 and the ultrafiltration system 12, a third electric valve 26 is arranged on a return pipeline 36, a fourth electric valve 27 is arranged on a pipeline between the chemical cleaning medicine box 21 and the ultrafiltration system 12, a sixth electric valve 29 is arranged on a pipeline between the chemical cleaning medicine box 21 and the permeate liquid water tank 13, a fifth electric valve 28 is arranged on a pipeline between the ultrafiltration system 12 and the permeate liquid water tank 13, a seventh electric valve 30 is arranged on a pipeline between the cleaning filter 20 and the permeate liquid water tank 13, and an eighth electric valve 34 is arranged on a pipeline at the inlet of the concentrated liquid storage tank 22.
Operation: when the ultrafiltration system 12 is in operation, the first electric valve 24, the third electric valve 26 and the fifth electric valve 28 are opened, and the second electric valve 25, the fourth electric valve 27, the sixth electric valve 29 and the seventh electric valve 30 are closed;
backwashing: when the ultrafiltration system 12 is backwashed, the third electric valve 26 and the seventh electric valve 30 are opened, and the first electric valve 24, the second electric valve 25, the fourth electric valve 27, the fifth electric valve 28 and the sixth electric valve 29 are closed;
chemical cleaning: when the ultrafiltration system 12 is chemically cleaned, the second electric valve 25, the fourth electric valve 27 and the sixth electric valve 29 are opened, and the first electric valve 24, the third electric valve 26, the fifth electric valve 28 and the seventh electric valve 30 are closed.
Furthermore, a first delivery pump and a second delivery pump are respectively arranged on the pipelines in the biogas liquid pool 1 and the middle water pool 4.
Furthermore, a check valve 6 is arranged on a pipeline between the intermediate water tank 4 and the secondary coarse filter 7 to prevent the materials from flowing back.
Furthermore, a concentrated solution storage tank 22 is connected to a concentrated solution outlet end of the reverse osmosis membrane system 17; a pressure gauge 31, a flow meter 33, an online density detector 32, a concentrate pump 23 and an eighth electric valve 34 are arranged on a pipeline between the reverse osmosis membrane system 17 and the concentrate storage tank 22, and a concentrate return pipe is arranged on a pipeline in front of the eighth electric valve 34; the concentrated liquid return pipe is communicated with the permeate liquid water tank 13.
The working principle is as follows: a pressure gauge 31 and a flow meter 33 are provided for collecting pressure and flow information. The online density detector 32 is used for monitoring the density of the concentrated solution, the qualified concentrated solution meets the requirement, the eighth electric valve 34 of the pipeline of the concentrated solution storage tank 22 is automatically opened at the moment, the qualified concentrated solution goes to the concentrated solution storage tank 22, and once the density is lower than the set density, the eighth electric valve 34 is closed, and the concentrated solution is circularly concentrated until the density reaches the standard. And when the qualified concentrated solution needs to be taken, the qualified concentrated solution is conveyed to a subsequent unit by a concentrated solution pump 23.
Furthermore, a high-low pressure protection device and an electric slow-opening valve are installed on a pipeline at the outlet of the high-pressure pump 16, and the high-pressure pump 16 is controlled by adopting a variable frequency.
The working principle is as follows: the high-pressure pump 16 adopts frequency conversion control, and can ensure the safe and stable operation of the high-pressure pump 16 and the membrane components.
The operations of the reverse osmosis membrane system, the ultrafiltration system 12, the backwashing system, the chemical cleaning process, the liquid outlet, the backflow and the like are controlled by a PLC (programmable logic controller), so that the electric valves, the pressure gauges 31, the pressure pumps and other equipment assembled on corresponding pipelines automatically run, monitor and adjust according to preset process parameters such as time, pressure, density judgment values and the like. Because the PLC is widely adopted in the field of biogas slurry fermentation and accessories thereof to automatically operate, detect and adjust related equipment, the details of how the PLC is applied to the automatic control of conventional electric control equipment such as an electric valve, a pressure gauge 31, a pressure pump and the like are not repeated.
Test examples
By adopting the biogas slurry membrane concentration treatment device in the embodiment and using the method in the embodiment to concentrate biogas slurry of a certain biogas slurry fermentation enterprise, the practical operation detection results are as follows:
first, concentrated solution index detection (first detection)
Second, the index detection of the concentrated solution (second detection)
From the two detections, the device and the method in the embodiment are adopted for biogas slurry concentration treatment, so that the concentration treatment of biogas slurry can be stably and effectively carried out, the enrichment of nutrients capable of being used for fertilizers in biogas slurry and the removal of harmful substances can be well realized, the nutritive value of biogas slurry is greatly improved, and great economic benefits are brought to the fertilizer production of biogas slurry. Meanwhile, each index of the clear liquid (penetrating liquid) produced by the method and the device meets the direct discharge standard, the pollution problem of the clear liquid discharge to the environment can be greatly reduced, meanwhile, the clear liquid can be recycled as landscape water and water for water washing and chemical cleaning in the concentration treatment process, the utilization rate of the biogas slurry stock solution is also improved to a certain extent, a large amount of fresh water resources are saved, and the green and environment-friendly potential and economic benefit of the biogas slurry fermentation engineering are further exerted.
Meanwhile, in the biogas slurry membrane concentration process, the membrane blockage situation is unavoidable and unpredictable, and chemical agents are adopted for a long time to delay the membrane blockage in the past, but the chemical agents are mixed into the biogas slurry concentration product to cause the chemical pollution of the latter, so that the harm is more serious. In the invention, the primary coarse filtration, the precise filtration and the ultrafiltration at the front end are all used for filtering particulate matters step by step, so that a reverse osmosis membrane component can be protected to the maximum extent under the condition that chemical agents are not suitable, the membrane blockage is delayed, the online clean water back washing and the manual chemical cleaning that liquid medicine cannot be mixed into biogas slurry are combined, and multiple prevention is realized, so that the membrane components of an ultrafiltration membrane system and a reverse osmosis membrane system can be up to 1-2 years, even more than 2 years.
In the experimental example, all the devices used for forming the membrane separation-based biogas slurry concentration process device in the experimental example can be selected conventionally from the same type of devices commonly used in the prior art, no special requirements are required for the specific types of the devices, and the selection conditions are only to meet all the process parameters related to the membrane separation-based biogas slurry concentration method; namely, the biogas slurry concentration process device based on membrane separation, which is composed of devices capable of meeting various process parameters involved in the biogas slurry concentration method based on membrane separation, can realize the biogas slurry concentration and purification effects obtained in the experimental example.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, and the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the content of the description of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a concentrated process units of natural pond liquid based on membrane separation which characterized in that: comprises a biogas slurry pool, a primary filtering system for coarse filtering of biogas slurry, an ultrafiltration system for ultrafiltration treatment of biogas slurry and a reverse osmosis membrane system for reverse osmosis treatment of biogas slurry, which are connected in sequence through pipelines according to the flow direction of biogas slurry; the coarse filtration system comprises at least two stages of coarse filters which are connected in sequence through pipelines and adopt physical filtration; the ultrafiltration system comprises at least two stages of fine filters and an ultrafiltration membrane system which are connected in sequence and adopt physical filtration; the reverse osmosis membrane system comprises at least one stage of security filter and a reverse osmosis membrane system which are sequentially connected through a pipeline.
2. The biogas slurry concentration process device based on membrane separation as claimed in claim 1, is characterized in that: the coarse filtering system consists of two stages of coarse filters, namely a first-stage coarse filter and a second-stage coarse filter in sequence; the filtering precision of the first-stage coarse filter is 100 micrometers, and the filtering precision of the second-stage coarse filter is 50-70 micrometers.
3. The membrane separation-based biogas slurry concentration process device as claimed in claim 1, characterized in that: the fine filter included in the ultrafiltration system is in two stages, namely a first-stage fine filter and a second-stage fine filter in sequence; the filtering precision of the first-stage fine filter is 50 micrometers, and the filtering precision of the second-stage fine filter is 5 micrometers.
4. The biogas slurry concentration process device based on membrane separation as claimed in claim 2, characterized in that: an intermediate water tank is arranged on a pipeline between the primary coarse filter and the secondary coarse filter; the biogas slurry pool and the pipeline in the middle water pool are respectively provided with a first water pump and a second water pump; and a check valve is arranged on a pipeline between the middle water tank and the secondary coarse filter.
5. The biogas slurry concentration process device based on membrane separation as claimed in claim 1, is characterized in that: a filtering water tank is arranged on a pipeline between the coarse filtering system and the ultrafiltration system, and an ultrafiltration raw water pump is arranged between the filtering water tank and the ultrafiltration system; a permeate water tank is arranged on a pipeline between the ultrafiltration system and the reverse osmosis membrane system; a booster pump is arranged on a pipeline between the permeate liquid water tank and the cartridge filter; and a high-pressure pump is arranged between the cartridge filter and the reverse osmosis membrane system.
6. The biogas slurry concentration process device based on membrane separation as claimed in claim 1, is characterized in that: the biogas slurry concentration process device based on membrane separation further comprises a backwashing system: the backwashing system is respectively connected with the ultrafiltration system and the reverse osmosis membrane system through pipelines.
7. The membrane separation-based biogas slurry concentration process device according to claim 6, characterized in that: the backwashing system comprises a cleaning filter, a clear water tank and a chemical cleaning medicine box which are connected through pipelines, the clear water tank and the chemical cleaning medicine box are arranged in parallel, and backwashing pumps are arranged on the pipelines between the cleaning filter and the clear water tank as well as between the cleaning filter and the chemical cleaning medicine box; and the clear water outlet end of the reverse osmosis membrane system is respectively connected with the clear water tank and the chemical cleaning chemical tank through clear water pipelines.
8. The membrane separation-based biogas slurry concentration process device according to claim 5, characterized in that: a first electric valve is arranged on a pipeline between the filtering water tank and the ultrafiltration system, a second electric valve is arranged on a pipeline between the cleaning filter and the ultrafiltration system, a third electric valve is arranged on a return pipeline, a fourth electric valve is arranged on a pipeline between the chemical cleaning medicine box and the ultrafiltration system, a sixth electric valve is arranged on a pipeline between the chemical cleaning medicine box and the permeate liquid water tank, a fifth electric valve is arranged on a pipeline between the ultrafiltration system and the permeate liquid water tank, a seventh electric valve is arranged on a pipeline between the cleaning filter and the permeate liquid water tank, and an eighth electric valve is arranged on a pipeline at the inlet of the concentrated liquid storage tank; and a high-low pressure protection device and an electric slow-opening valve are arranged on a pipeline at the outlet of the high-pressure pump, and the high-pressure pump is controlled by frequency conversion.
9. The membrane separation-based biogas slurry concentration process device according to claim 8, wherein a concentrated solution storage tank is connected to a concentrated solution outlet end of the reverse osmosis membrane system; a pressure gauge, a flow meter, an online density detector, a concentrated solution pump and an eighth electric valve are arranged on a pipeline between the reverse osmosis membrane system and the concentrated solution storage tank, and a concentrated solution return pipe is arranged on a pipeline in front of the eighth electric valve; the concentrated solution return pipe is communicated with the permeate solution water tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112645502A (en) * | 2021-01-11 | 2021-04-13 | 丁洪军 | Zero release sewage filtration system |
| CN113797758A (en) * | 2021-08-25 | 2021-12-17 | 黄山华绿园生物科技有限公司 | Plant beverage concentrating device and concentrating method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112645502A (en) * | 2021-01-11 | 2021-04-13 | 丁洪军 | Zero release sewage filtration system |
| CN113797758A (en) * | 2021-08-25 | 2021-12-17 | 黄山华绿园生物科技有限公司 | Plant beverage concentrating device and concentrating method thereof |
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