CN110151924B - Desalination optimization method and device for spartina alterniflora - Google Patents
Desalination optimization method and device for spartina alterniflora Download PDFInfo
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Abstract
The invention provides a desalination device of spartina alterniflora, which comprises a desalination bin, a two-way valve, an automatic controller, a salinity detection system, a reverse osmosis system, a peristaltic pump and a connecting water pipe. A desalination optimization method of spartina alterniflora, comprising: s1, preprocessing a spartina alterniflora sample; s2, setting a clear water desalting method, a material-liquid ratio and desalting time as experimental factors, and setting different levels; s3, designing a plurality of groups of horizontally combined experiment conditions to carry out a desalting experiment; s4, starting a desalting device of the spartina alterniflora, putting the pretreated spartina alterniflora into a desalting bin, carrying out an experiment according to a plurality of groups of horizontal combination experiment conditions, and monitoring the salt content in water after the experiment is finished; and S5, analyzing the experimental result, and selecting the optimal horizontal combination as the optimal process parameter. The desalination equipment and the desalination optimization method thereof provided by the invention are simple to operate, low in cost, high in desalination rate and high in brine recovery rate after desalination treatment.
Description
Technical Field
The invention relates to the field of spartina alterniflora resource utilization, in particular to a method and equipment for optimizing desalination of spartina alterniflora.
Background
Spartina alterniflora (Spartina alterniflora) is belonging to the family Poaceae, and perennial herbaceous plants, which are mostly grown in the estuary and intertidal zones and native to the coast of the Atlantic ocean and gulf of Mexico. Because of its ecological functions of reducing silt, building land, protecting bank, etc., it is introduced into various countries for planting. However, because of strong fertility and lack of natural enemies, a single dominant species community is often formed after the introduction, the ecological system balance of the introduced area is damaged, the local biodiversity is threatened, even the local species are killed, and the plant is listed as an invasive plant to be strictly controlled by multiple countries. China introduced spartina alterniflora in the last 70 th century. In recent years, the method has increasingly threatened native species of coastal wetlands in China, destroys coastal ecosystems in China, and is listed in a list of foreign species which invade China for the first time.
However, the spartina alterniflora is a coastal plant resource, is rich in nutrient components, and contains a large amount of crude protein, crude fat, crude fiber, calcium, phosphorus and 18 amino acids. In addition, the spartina alterniflora contains flavonoids, and has the effects of resisting inflammation, immunizing, reducing blood sugar, resisting cancer and the like. The spartina alterniflora has good feeding and medicinal values. In addition, researches show that the spartina alterniflora dry matter has high yield and is a good raw material for producing the methane, and the spartina alterniflora is used as a base fertilizer, so that the organic matters of the soil can be increased, and the effect of increasing the yield is achieved. Therefore, the spartina alterniflora has great development and utilization values. The spartina alterniflora is reasonably recycled, so that the negative influence on ecology can be restrained, and the resource advantages can be fully developed. However, the spartina alterniflora is used as a salt marsh plant growing in an intertidal zone and has high salt content, which is one of important limiting factors that the spartina alterniflora is difficult to be completely recycled.
At present, the research on the utilization of spartina alterniflora resource rarely considers the secondary environmental influence possibly brought by the high salt content. Only the surface layer is treated by adopting a mode of flushing with clear water at random, which only can remove the salt on the surface of the material, and the desalting effect is poor; it has also been proposed to perform desalination by steam fermentation, but the desalination is more efficient, more expensive and more complicated to operate. Therefore, a low-cost, efficient and convenient desalting method and desalting equipment are lacked in the resource utilization of spartina alterniflora.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and equipment for desalting and optimizing spartina alterniflora, which overcome the defects of the prior art, solve the problems of huge water consumption for desalting by utilizing spartina alterniflora resources, shorten the desalting time, recycle desalted water and reduce the desalting cost.
The invention provides a desalination device of spartina alterniflora, which comprises a desalination bin, a two-way valve, an automatic controller, a salinity detection system, a reverse osmosis system, a peristaltic pump and a connecting water pipe, wherein the two-way valve is arranged on the desalination bin;
the desalting bin comprises a desalting bin wall, a feeding hole, a circulating water inlet, a pure water inlet, a spiral stirrer, a power system, a circulating water outlet and a liquid level sensor, wherein an electric heating wire is arranged in the desalting bin wall, the inner wall of the desalting bin wall is made of stainless steel, and the electric heating wire is connected with a power supply; the liquid level sensor is connected with the automatic controller through a cable, the feed inlet is positioned at the top end of the desalting bin, the circulating water inlet and the pure water inlet are respectively positioned at the upper end of the desalting bin, the pure water inlet is connected with a pure water supply device through a water pipe, a two-way valve is arranged between the pure water inlet and the pure water supply device, and the two-way valve is controlled to be switched on and off through the automatic controller; the circulating water inlet is connected with a peristaltic pump through a water pipe, and the peristaltic pump is connected with the flow combiner through a water pipe; the circulating water outlet is connected with the flow divider through a water pipe, and a salinity detection system is arranged in the middle of the circulating water outlet; the separator is connected with a plurality of water pipes, each water pipe is connected with one end of one reverse osmosis membrane, a water guide pipe is arranged at the tail part of the reverse osmosis membrane, the other end of the reverse osmosis membrane is connected with one end of the water pipe, and the other end of the water pipe is connected with the confluence device; the spiral stirrer is connected with a power system, and the power system provides power.
As a further improvement of the invention, the liquid level sensor comprises a liquid level transmitter, an air guide cable, a wave-proof tube and a cable fixing frame, wherein the liquid level transmitter is connected with the cable through the air guide cable, the liquid level transmitter and the air guide cable are arranged in the wave-proof tube, and the air guide cable is fixed through the cable fixing frame.
As a further improvement of the invention, more than 3 reverse osmosis membranes are arranged, and the salinity detection system is used for detecting the percentage content of chloride ions in water.
As a further improvement of the invention, the spiral stirrer is a longitudinal spiral stirrer, and the height of the spiral stirrer is flush with the lower end of the circulating water inlet.
The invention further provides a desalination optimization method of spartina alterniflora, which comprises the following steps:
s1, preprocessing a spartina alterniflora sample;
s2, setting a clear water desalting method, a material-liquid ratio and desalting time as experimental factors, and setting different levels for each experimental factor;
s3, designing a plurality of groups of horizontally combined experiment conditions to carry out a desalting experiment by combining the level of each experiment factor;
s4, starting the desalting equipment for the spartina alterniflora, putting the spartina alterniflora pretreated by S1 into a desalting bin, performing an experiment according to the multiple groups of horizontal combination experiment conditions set in the step S3, and monitoring the salt content in water after the experiment is finished;
s5, analyzing the experimental result of the step S4, selecting the optimal level combination, and determining the optimal technological parameters for the resource utilization and desalination of the spartina alterniflora.
As a further improvement of the present invention, the step S1 specifically includes: cleaning the plant sample with clear water, removing impurities such as gravel, soil and the like, placing the plant sample in a ventilated and cool place for natural air drying, and cutting the air-dried plant sample into small sections with the length of less than 0.5cm by using pruning shears.
As a further improvement of the present invention, the step S2 specifically includes: the clear water desalting method comprises 2 levels of oscillation and non-oscillation, wherein the material-liquid ratio is set to 4 levels which are respectively 1g:15mL, 1g:20mL, 1g:25mL and 1g:30 mL; the desalting time was set at 6 levels, 1, 2, 3, 4, 5 and 6h, respectively.
As a further improvement of the present invention, the step S5 specifically includes: screening experimental conditions for reducing the percentage content of chloride ions in water to a normal value range, and selecting a horizontal combination with low cost and high efficiency as an optimal spartina alterniflora desalting method; the normal range is 0.32-1.84%.
As a further improvement of the invention, in the desalting process of the spartina alterniflora hay, the feed-liquid ratio is 1g:15mL or 1g:20mL, and the desalting mode is that the time for soaking and desalting with clear water is 1h-6 h; in the desalting process of the spartina alterniflora fresh grass, the material-liquid ratio is 1g:25mL or 1g:30mL, and the desalting mode is that the desalting time is 2-4 h after soaking in clear water.
As a further improvement of the invention, in the desalting process of the spartina alterniflora hay, the material-liquid ratio is 1g:20mL, and the desalting mode is that the desalting time is 1h after soaking in clear water; in the desalting process of the spartina alterniflora fresh grass, the material-liquid ratio is 1g to 25mL, and the desalting mode is that the soaking desalting with clear water and the desalting time are 3 hours.
The invention has the following beneficial effects:
the desalination equipment and the desalination optimization method thereof provided by the invention are simple to operate, low in cost, high in desalination rate and high in brine recovery rate after desalination treatment;
according to the desalting equipment provided by the invention, under the power provided by the power system, the spiral stirring device uniformly stirs the spartina alterniflora in the desalting equipment and fully contacts with pure water, and the electric heating wires are arranged in the wall of the desalting bin to heat materials in the bin, so that the desalting efficiency is improved; under the pressure provided by the peristaltic pump, the high-concentration salt water passes through a plurality of reverse osmosis systems and permeates through reverse osmosis membranes with the pore diameter of only 0.0001 micron, most inorganic salts are permeated, and are converged and discharged out of the device through the water guide pipe, and the purified water is circulated back to the desalting equipment, so that the cyclic utilization rate of the water is improved, and the cost is reduced; on the other hand, the water level in the desalting equipment is measured at any time through the liquid level sensor, the automatic controller controls the switch of the two-way valve to supplement pure water in time so as to ensure the water quantity required by desalting, the participation of personnel in the whole process is low, the operation is simple, the structure of the equipment is simple, the cost and the maintenance cost are low, meanwhile, the salt content of the water in the desalting equipment is low, the desalting efficiency is convenient to improve, the desalting rate is high, the finally obtained desalting is produced and utilized, convenience is provided for recycling high-salt water entering the equipment again, the energy consumption is reduced, and the recovery rate is high;
the desalination optimization method for the spartina alterniflora resource utilization, disclosed by the invention, has the advantages that the experiment conditions are reasonably set, the comprehensive consideration of desalination process parameters of halophytes is completed, the influence of three experiment factors of the desalination method, the desalination time and the material-liquid ratio on the salt content of the spartina alterniflora is disclosed, the optimization of the desalination process parameters is effectively realized, the cost of the spartina alterniflora desalination is reduced, the desalination efficiency is improved, and meanwhile, the method has important significance for reducing the secondary pollution caused by redundant salt in the spartina alterniflora resource utilization process in the resource utilization process.
Drawings
FIG. 1 shows the salt content of a Spartina alterniflora sample under different desalting methods, desalting times and material-to-liquid ratios according to the present invention;
FIG. 2 shows the salt content of fresh spartina alterniflora samples varied according to the present invention under different desalting methods, desalting times and feed-to-liquid ratios;
FIG. 3 is a comparison of the desalination efficiency of a fresh spartina alterniflora sample according to the different desalination methods of the present invention;
FIG. 4 is a comparison of desalination efficiency of a fresh spartina alterniflora sample for different feed liquid ratios of the present invention;
FIG. 5 is a schematic view of a desalination apparatus according to the present invention;
FIG. 6 is a schematic structural view of a desalting bin according to the present invention;
FIG. 7 is a schematic view of the liquid level sensor of the present invention;
wherein, 1, a feed inlet; 2. a circulating water inlet; 3. a helical agitator; 4. a power system; 5. a pure water inlet; 6. a liquid level sensor; 61. a liquid level transmitter; 62. an air guide cable; 63. a wave-proof tube; 64. a cable fixing frame; 7. a two-way valve; 8. an automatic controller; 9. a salinity detection system; 10. a reverse osmosis membrane; 11. a flow divider; 12. a flow combiner; 13. a water conduit; 14. a peristaltic pump; 15. a cable; 16. a water outlet; 17. a discharge port; 18. a desalination chamber wall; 19. a circulating water outlet; 20. and (5) a desalting bin.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the embodiments described are only some representative embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to the attached figure 1, the desalination equipment for spartina alterniflora comprises a desalination bin 20, a two-way valve 7, an automatic controller 8, a salinity detection system 9, a reverse osmosis system, a peristaltic pump 14 and a connecting water pipe;
referring to the attached drawings 1 and 2, the desalination bin 20 comprises a desalination bin wall 18, a feed inlet 1, a circulating water inlet 2, a pure water inlet 5, a spiral stirrer 3, a power system 4, a circulating water outlet 19 and a liquid level sensor 6, wherein an electric heating wire is arranged in the desalination bin wall 18, the inner wall of the desalination bin wall is made of stainless steel, and the electric heating wire is connected with a power supply; the liquid level sensor 6 is connected with the automatic controller 8 through a cable 15, the feed inlet 1 is positioned at the top end of the desalting bin 20, the circulating water inlet 2 and the pure water inlet 5 are respectively positioned at the upper end of the desalting bin 20, the pure water inlet 5 is connected with a pure water supply device through a water pipe, a two-way valve 7 is arranged between the two-way valve and the pure water inlet, and the automatic controller 8 controls the two-way valve 7 to be opened and closed; the circulating water inlet 2 is connected with a peristaltic pump 14 through a water pipe, and the peristaltic pump 14 is connected with the flow combiner 12 through a water pipe; the circulating water outlet 19 is connected with the flow divider 11 through a water pipe, and the salinity detection system 9 is arranged in the middle of the circulating water outlet; the separator 11 is connected with a plurality of water pipes, each water pipe is connected with one end of one reverse osmosis membrane 10, the tail part of the reverse osmosis membrane 10 is provided with a water guide pipe 13, the water guide pipe is a high-molecular hose, the other end of the water guide pipe is connected with one end of the water pipe, and the other end of the water pipe is connected with the flow combiner 12; the spiral stirrer 3 is connected with a power system 4, and is powered by the power system 4.
According to the desalting equipment provided by the invention, under the power provided by the power system 4, the spiral stirring device 3 uniformly stirs the chopped spartina alterniflora in the desalting equipment and fully contacts with pure water, and the electric heating wires are arranged in the wall 18 of the desalting bin to heat materials in the bin, so that the desalting efficiency is improved; the high-concentration salt water passes through the reverse osmosis membranes 10 with the pore diameter of only 0.0001 micron under the pressure provided by the peristaltic pump 14, most inorganic salts are permeated and are converged by the water guide pipe 13 and discharged out of the device, and the purified water is recycled to the desalting equipment, so that the recycling rate of the water is improved, and the cost is reduced; whole process personnel's participation degree is low, easy operation, and simple structure makes cost, maintenance expense lower of equipment itself, and simultaneously, the salt rate of desalination equipment normal water is lower, is convenient for improve desalination efficiency, and the desalination rate is high, and the finally utilization in production of the desalination that obtains also provides convenience to the reentry equipment recovery of high salt water moreover, and the energy consumption reduces, the rate of recovery is high.
Referring to fig. 3, the liquid level sensor 6 comprises a liquid level transmitter 61, an air guide cable 62, a wave guide tube 63 and a cable fixing frame 64, wherein the liquid level transmitter 61 is connected with the cable 15 through the air guide cable 62, the liquid level transmitter 61 and the air guide cable 62 are arranged in the wave guide tube 63, and the air guide cable 62 is fixed through the cable fixing frame 64. The water level in the desalting equipment is measured at any time through the liquid level sensor 6, and the automatic controller 8 controls the two-way valve 7 to be switched on and off to supplement pure water in time so as to ensure the water quantity required by desalting.
In a preferred embodiment, the reverse osmosis membrane 10 is provided with more than 3. Set up reverse osmosis membrane 10 more than 3 and be convenient for high-efficiently with the salt ion desorption in the brine that desalination storehouse 20 flows out, both satisfied the demand of low salt ion in the water, can guarantee the water yield of the circulating water that returns desalination storehouse 20 again, reduce the pure water supply volume, practice thrift the cost, improve production efficiency.
In a preferred embodiment, the helical agitator 3 is a longitudinal helical agitator, and the height of the helical agitator 3 is flush with the lower end of the circulating water inlet 2. After the power system 4 is started, the spiral stirrer 3 rotates along with the power system, and the materials in the desalting bin 20 are stirred to rotate. The longitudinal spiral stirrer 3 can fully stir all material flows, and the spartina alterniflora sections can be fully contacted with water for desalination, so that the desalination efficiency is improved.
The salinity detection system 9 is a salinity detector and is used for detecting the percentage content of chloride ions in water. The range of the salinity detector is 0.01-70%, the resolution is 0.001, and the precision is +/-0.001%. The salinity detection system is accurate in detecting 9 percentage content of detected chloride ions, high in precision, capable of achieving real-time monitoring and convenient for obtaining an optimized experimental scheme at any time.
Example 1
The raw material sources are as follows: spartina alterniflora sample of yellow estuary.
S1, pretreatment of a plant sample:
cleaning dry branches of spartina alterniflora with clear water for 3 times, removing impurities such as gravel, soil and the like, and placing in a ventilated and cool place for natural air drying; and shearing the air-dried spartina alterniflora sample into small sections with the length of less than 0.5cm by using pruning shears for later use.
S2, setting a clear water desalting method, a material-liquid ratio, a desalting temperature and desalting time as experimental factors, and setting different levels for each experimental factor: the clear water desalting method comprises 2 levels of oscillation and non-oscillation, wherein the material-liquid ratio is set to 4 levels which are respectively 1g:15mL, 1g:20mL, 1g:25mL and 1g:30 mL; the desalting temperature is set to 5 levels, which are 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃ respectively; the desalting time was set at 6 levels, 1, 2, 3, 4, 5 and 6h, respectively.
S3, designing a desalting experiment scheme:
clear water desalination method, material-liquid ratio and desalination time are selected as factors influencing the salt content of the spartina alterniflora and different levels are set for each experiment factor, which is shown in table 1. And designing a plurality of groups of experiment conditions of horizontal combination by combining the level of each experiment factor to carry out a desalting experiment, see table 1, designing three-factor experiments altogether, and totally 48 treatment combinations, particularly see table 1.
Table 1 experimental treatment setup
Note: soaking and desalting with clear water, namely soaking the plant sample with deionized water, and standing; shaking for desalting, soaking plant sample with deionized water, and shaking simultaneously.
S4, desalting experiment:
(1) soaking in clear water without shaking for desalination
Weighing 1kg of pretreated spartina alterniflora dead branch sample, putting the sample into a desalting device from a feeding port, adding deionized water according to a set material-liquid ratio, starting a power system without starting, soaking for a certain time, and then measuring the salinity of the sample.
(2) Soaking in clear water, shaking and desalting
Weighing 1kg of pretreated spartina alterniflora deadwood sample, putting the sample into a desalting device from a feeding port, adding deionized water according to a set material-liquid ratio, starting a power system, stirring by a spiral stirrer, setting the rotating speed at 300-one 500r/min, desalting for a certain time, and measuring the salinity of the sample.
S5, screening optimal process parameters:
(1) according to the salt content measurement result (figure 1), the salt content of the spartina alterniflora dead branches can be reduced to a normal value range (shown by a dotted line in figure 1) after 1h of desalination by different feed-liquid ratios and different desalination methods. Therefore, the desalting time of the dead branches of spartina alterniflora was first determined to be 1 h.
(2) For the method of desalting by soaking in clear water, when the material-liquid ratio is 1g:15mL, the salt content of the spartina alterniflora dead branches after desalting for 1h is close to the upper limit of the normal value range, and the risk of failing to achieve the desalting target exists; the salt content of the spartina alterniflora dead branches after 1h of desalination is lower than the upper limit of a normal value under the other 3 material-to-liquid ratio levels; in order to reduce the cost, 1g:20mL is selected as the optimal material-liquid ratio of the method for soaking and desalting with clear water.
For the oscillation desalting, under the level of 4 feed-liquid ratios, the salt content of the spartina alterniflora dead branches after 1h of desalting is lower than the upper limit of a normal value, so that 1g:15mL is screened as the optimal feed-liquid ratio of the oscillation desalting method.
(3) According to the market price, the unit price of deionized water is 1.5 yuan/L, the electricity charge is 0.4883 yuan/degree, the material-liquid ratio is 1g:20mL, the cost difference of two schemes of 1h (0.45 yuan) and 1g:15mL of desalination by soaking in clear water and 1h (0.78 yuan) of vibration desalination is that: the former consumes more (20mL-15mL) x 10 x 6 (300 mL) deionized water than the latter, and the price is 0.45 yuan; the latter uses 1h more electricity than the former, and the digital display constant temperature oscillator power is 1600W, consumes 0.78 yuan of electricity. As can be seen, the cost of the first scheme is lower, so that the optimal desalination process of spartina alterniflora dead branches is realized by soaking and desalinating the feed liquid for 1 hour in clear water in a ratio of 1g to 20 mL.
Example 2
The raw material sources are as follows: the spartina alterniflora fresh sample of the yellow river mouth.
S1, pretreatment of a plant sample:
cleaning the spartina alterniflora fresh sample for 3 times by clear water, removing impurities such as gravel, soil and the like, and placing the spartina alterniflora fresh sample in a ventilated and cool place for natural air drying; cutting the air-dried fresh branches of the spartina alterniflora into small sections with the length of less than 0.5cm by using pruning shears for later use.
S2, setting a clear water desalting method, a material-liquid ratio, a desalting temperature and desalting time as experimental factors, and setting different levels for each experimental factor: the clear water desalting method comprises 2 levels of oscillation and non-oscillation, wherein the material-liquid ratio is set to 4 levels which are respectively 1g:15mL, 1g:20mL, 1g:25mL and 1g:30 mL; the desalting temperature is set to 5 levels, which are 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃ respectively; the desalting time was set at 6 levels, 1, 2, 3, 4, 5 and 6h, respectively.
S3, designing a desalting experiment scheme:
the desalting method, the material-liquid ratio and the desalting time are selected as factors influencing the salt content of the fresh branches of the spartina alterniflora, different levels are set for each experiment factor, and the salt content is shown in table 1. And designing a plurality of groups of experiment conditions of horizontal combination by combining the level of each experiment factor to carry out desalination experiment.
S4. desalination experiment
(1) Soaking in clear water without shaking for desalination
Weighing 1kg of the pretreated spartina alterniflora fresh sample, putting the pretreated spartina alterniflora fresh sample into a desalting device from a feeding port, adding deionized water according to a set material-liquid ratio, starting a power system without starting, soaking for a certain time, and then measuring the salinity of the sample.
(2) Soaking in clear water, shaking and desalting
Weighing 1kg of the pretreated spartina alterniflora fresh sample, putting the pretreated spartina alterniflora fresh sample into a desalting device from a feeding port, adding deionized water according to a set material-liquid ratio, starting a power system, stirring by a spiral stirrer, setting the rotating speed at 300-one-step pressure of 500r/min, and after desalting for a certain time, determining the salinity of the sample.
S5, screening optimal process parameters:
(1) according to the measurement results of the salt content (FIG. 2), when the feed-to-liquid ratio was 1g:15mL and 1g:20mL, the salt content of the fresh spartina alterniflora sample could not be reduced to the normal value range or close to the upper limit of the normal value range, and thus it was not suitable for desalting the fresh spartina alterniflora sample. When the feed-liquid ratio is 1g:25mL and 1g:30mL, the salt content of the spartina alterniflora fresh branches can be reduced to a normal value range after 3 hours of desalination, and the feed-liquid ratio is an alternative feed-liquid ratio parameter for desalination of the spartina alterniflora fresh branches.
(2) Comparing the desalination efficiency of different desalination methods at a feed-to-liquid ratio of 1g:25mL and 1g:30mL (FIG. 3), it was found that the desalination efficiency of clear water soaking was higher than that of shaking desalination, and therefore clear water soaking desalination was screened as the optimal desalination method.
(3) Comparing the desalination efficiency of different material-liquid ratios when desalting with clear water soaking (FIG. 4), it was found that the desalination efficiency of the material-liquid ratio of 1g:25mL is the highest, and therefore 1g:25mL is screened as the optimal material-liquid ratio parameter.
(4) After soaking and desalting for 3 hours in clear water at a material-liquid ratio of 1g to 25mL, the salt content of the spartina alterniflora fresh branches is reduced to a normal value range, and 3 hours is selected as the optimal desalting time for reducing the time cost.
Therefore, the optimal desalination process of the spartina alterniflora fresh branches is to soak and desalt the spartina alterniflora fresh branches for 3 hours by clear water with the material-liquid ratio of 1g:25 mL.
Compared with the prior art, the desalination equipment and the desalination optimization method thereof provided by the invention have the advantages of simple operation, low cost, high desalination rate and high recovery rate of the desalted brine.
The desalination optimization method for the spartina alterniflora resource utilization, disclosed by the invention, has the advantages that the experiment conditions are reasonably set, the comprehensive consideration of desalination process parameters of halophytes is completed, the influence of three experiment factors of the desalination method, the desalination time and the material-liquid ratio on the salt content of the spartina alterniflora is disclosed, the optimization of the desalination process parameters is effectively realized, the cost of the spartina alterniflora desalination is reduced, the desalination efficiency is improved, and meanwhile, the method has important significance for reducing the secondary pollution caused by redundant salt in the spartina alterniflora resource utilization process in the resource utilization process.
Various modifications may be made to the above without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is therefore intended to be limited not by the above description, but rather by the scope of the appended claims.
Claims (3)
1. A desalination device of spartina alterniflora is characterized by comprising a desalination bin, a two-way valve, an automatic controller, a salinity detection system, a reverse osmosis system, a peristaltic pump and a connecting water pipe;
the desalting bin comprises a desalting bin wall, a feeding hole, a circulating water inlet, a pure water inlet, a spiral stirrer, a power system, a circulating water outlet and a liquid level sensor, wherein an electric heating wire is arranged in the desalting bin wall, the inner wall of the desalting bin wall is made of stainless steel, and the electric heating wire is connected with a power supply; the liquid level sensor is connected with the automatic controller through a cable, the feed inlet is positioned at the top end of the desalting bin, the circulating water inlet and the pure water inlet are respectively positioned at the upper end of the desalting bin, the pure water inlet is connected with a pure water supply device through a water pipe, a two-way valve is arranged between the pure water inlet and the pure water supply device, and the two-way valve is controlled to be switched on and off through the automatic controller; the circulating water inlet is connected with a peristaltic pump through a water pipe, and the peristaltic pump is connected with the flow combiner through a water pipe; the circulating water outlet is connected with the flow divider through a water pipe, and a salinity detection system is arranged in the middle of the circulating water outlet; the flow divider is connected with a plurality of water pipes, each water pipe is connected with one end of one reverse osmosis membrane, a water guide pipe is arranged at the tail part of the reverse osmosis membrane, the other end of the reverse osmosis membrane is connected with one end of the water pipe, and the other end of the water pipe is connected with the flow combiner; the spiral stirrer is connected with a power system, and the power system provides power;
the spiral stirrer is a longitudinal spiral stirrer, and the height of the spiral stirrer is flush with the lower end of the circulating water inlet;
the material-liquid ratio in the desalting process of spartina alterniflora hay is 1g:15mL or 1g:20mL, wherein the desalting mode is that the desalting time is 1-6 h after soaking in clear water; or the material-liquid ratio in the desalting process of the spartina alterniflora fresh grass is 1g:25mL or 1g:30mL, the desalting mode is that the time for soaking and desalting with clear water is 2-4 h.
2. The spartina alterniflora desalination apparatus of claim 1, wherein the liquid level sensor comprises a liquid level transmitter, an air guide cable, a wave prevention tube and a cable fixing frame, the liquid level transmitter is connected with the cable through the air guide cable, the liquid level transmitter and the air guide cable are arranged in the wave prevention tube, and the air guide cable is fixed through the cable fixing frame.
3. The apparatus for desalinating spartina alterniflora according to claim 1, wherein the number of the reverse osmosis membranes is 3 or more, and the salinity detecting system detects the percentage of chloride ions in the water.
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| CN104396569A (en) * | 2014-12-10 | 2015-03-11 | 福建农林大学 | Method for recycling spartina alterniflora |
| CN206680289U (en) * | 2017-04-20 | 2017-11-28 | 优口（广东）环境系统有限公司 | More water route multi-cycle reverse osmosis purified water systems |
| CN206978672U (en) * | 2017-04-28 | 2018-02-09 | 重庆丰都明富实业有限公司 | A kind of chinese bulbous onion desalter |
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| CN104396569A (en) * | 2014-12-10 | 2015-03-11 | 福建农林大学 | Method for recycling spartina alterniflora |
| CN206680289U (en) * | 2017-04-20 | 2017-11-28 | 优口（广东）环境系统有限公司 | More water route multi-cycle reverse osmosis purified water systems |
| CN206978672U (en) * | 2017-04-28 | 2018-02-09 | 重庆丰都明富实业有限公司 | A kind of chinese bulbous onion desalter |
| CN207241421U (en) * | 2017-06-06 | 2018-04-17 | 姚宗学 | Detect the fuel tank of volume read-out |
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