CN114275870A - Method and device for remineralizing desalted water by limestone whey - Google Patents
Method and device for remineralizing desalted water by limestone whey Download PDFInfo
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Abstract
The invention relates to the technical field of desalinated water post-treatment, in particular to a method and a device for remineralizing desalinated water by limestone whey. The invention provides a method for remineralizing desalted water, which comprises the following steps: mixing the limestone slurry with the desalted water to form limestone slurry; the limestone whey comprises limestone and water, the particle size of the limestone is less than or equal to 3 mu m, and the mass percentage content of the limestone in the limestone whey is less than or equal to 25 percent; mixing an acid agent and the limestone water slurry to accelerate limestone dissolution and obtain remineralized water, wherein the acid agent comprises carbon dioxide and/or a dilute acid water solution. The method for remineralizing the desalted water can effectively improve the speed of the limestone solution, so that the remineralization efficiency of the desalted water is improved.
Description
Technical Field
The invention relates to the technical field of desalinated water post-treatment, in particular to a method and a device for remineralizing desalinated water by limestone whey.
Background
Seawater desalination has become an indispensable method for solving the problem of water for industrial, urban and rural life and agricultural irrigation in coastal water shortage areas, and some areas have brought desalinated seawater (for short, desalinated water or desalted water) into urban water supply networks. However, no matter the seawater desalination treatment is reverse osmosis, electrodialysis, multistage flash evaporation, multi-effect distillation and the like, the effluent is weak acidic soft water, and the problems of low pH value, low mineral content, poor taste and the like exist, so that not only can water storage facilities at the downstream end and water supply facilities such as pipelines and valves be corroded, but also the requirements of crop irrigation water and drinking water are not met, especially the mineral content is low (for example, the calcium content of the effluent of the desalted water in the reverse osmosis process is about 3mg/L, and the hardness is generally 13-17mg/L), and the effective mineral supplement cannot be obtained by a human body after long-term drinking, so that the body health is influenced. The remineralization treatment of the desalted water becomes an important component of the post-treatment process of the desalted water, can effectively avoid corrosion, makes the water delicious and meets the drinking requirement of life, and has very important practical significance.
At present, methods for remineralizing desalinated water mainly comprise: direct addition of chemicals (e.g. CaCl addition)2And NaHCO3Adding Ca (OH)2And NaCO3Or adding CaSO4And NaHCO3) Lime (Ca (OH)2) CO of2Bed of dissolved limestone particles (CaCO)3) Filtering and dissolving, blending a salt and fresh water source and the like. Wherein the chemical substance is directly added by adding CaCl2And NaHCO3For example, CaCl is required2Solution and NaHCO3Solutions, expensive and impractical, are only suitable for small scale projects. CO 22Lime dissolved (Ca (OH)2) The method has the greatest advantages that the lime reaction process is complete, however, the price of lime is higher and CO is generated2The consumption is high, and the turbidity of the produced water is also increased. And CO2Dissolved limestone particles (CaCO)3) The method has the advantages of low carbon, environmental protection, low input cost and the like, the process is cheaper than a lime dissolving process, and only half of CO is consumed under the condition of generating the same mineral substances2However, when the method is used for remineralizing the desalted water, the dissolution speed of limestone particles is slow, and the remineralization efficiency of the desalted water is low.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for desalinating desalinated water by using limestone milk, and the method for desalinating desalinated water provided by the present invention can effectively increase the dissolution rate of limestone, thereby increasing the efficiency of desalinating desalinated water.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for remineralizing desalted water by limestone whey, which comprises the following steps:
(1) mixing the limestone slurry with the desalted water to form limestone slurry; the limestone whey comprises limestone and water, the particle size of the limestone is less than or equal to 3 mu m, and the mass percentage content of the limestone in the limestone whey is less than or equal to 25 percent;
(2) mixing an acid agent and the limestone water slurry to accelerate limestone dissolution mineralization, wherein the acid agent comprises carbon dioxide and/or dilute acid water solution.
Preferably, the volume ratio of the limestone whey to the desalted water is (0.02-0.04): 1.
Preferably, in the step (1), the limestone slurry is injected at a flow rate of 200 to 400mL/min during the mixing.
Preferably, in the step (1), the injection flow rate of the desalted water is 8-15L/min during the mixing.
Preferably, when the acid agent is carbon dioxide, the molar ratio of limestone and carbon dioxide in the limestone whey is 1 (0.4-2);
when the acid agent is a dilute acid aqueous solution, the dilute acid aqueous solution is a dilute sulfuric acid and/or carbonic acid aqueous solution, the molar concentration of the dilute acid aqueous solution is 0.9-3.2 mmol/L, and limestone and dilute acid in the limestone whey are obtainedH in aqueous solution+The molar ratio of (1) is (0.2-1.4).
Preferably, the mixing in the step (2) is to inject an acid agent into the limestone water slurry, wherein the injection flow rate of the acid agent is 0.015-0.4L/min, and the acid agent is injected from the bottom of the limestone water slurry.
Preferably, the acid agent and the limestone water slurry are mixed to obtain a clear liquid, and the clear liquid is filtered; during the filtration, the flow rate of the clarified liquid is less than or equal to 11L/min; the filtering medium comprises one or more of gravel, quartz sand and limestone, the particle sizes of the gravel and the quartz sand are independently 1-10 mm, and the particle size of the limestone is 1-3 mm.
Preferably, CaCO is contained in said limestone3The mass percentage content of the limestone is more than or equal to 97.5 percent, and the density of the limestone is 2.5-2.7 g/cm3。
The invention provides a device for a method for desalinating desalinated water by using limestone whey, which comprises the following steps:
a clarifier 19, said clarifier 19 provided with a first liquid inlet, a second liquid inlet, a gas inlet and an outlet;
the outlet of the desalted water storage container 1 is communicated with the first liquid inlet of the clarification tank 19;
a slurry storage vessel 7 having an outlet in communication with a first liquid inlet of said clarifier 19;
the device also comprises a carbon dioxide gas storage container 12 with an outlet communicated with the gas inlet of the clarification tank 19 and/or a dilute acid water solution storage container 17 with an outlet communicated with the second liquid inlet of the clarification tank 19.
Preferably, the method further comprises the following steps:
and the inlet of the contact filter 22 is communicated with the outlet of the clarification tank 19, and the empty bed contact time of the contact filter 22 is 20-25 min.
The invention provides a method for remineralizing desalted water by limestone whey, which comprises the following steps: mixing the limestone slurry with the desalted water to form limestone slurry; the limestone whey comprises limestone and water, the particle size of the limestone is less than or equal to 3 mu m, and the mass percentage content of the limestone in the limestone whey is less than or equal to 25 percent; mixing an acid agent and the limestone water slurry to accelerate dissolution and mineralization of limestone to obtain remineralized water, wherein the acid agent comprises carbon dioxide and/or a dilute acid water solution. The preparation method provided by the invention adopts the mixing of limestone magma and desalted water, the particle size of the limestone magma is controlled to be less than or equal to 3 mu m, and the mass percentage content of the limestone is controlled to be less than or equal to 25 percent; can effectively improve the dissolving speed of the limestone in the desalted water. Meanwhile, the acid agent and the limestone water slurry are mixed, and the dissolution of limestone can be accelerated by the acid agent, so that the preparation method provided by the invention can effectively improve the dissolution speed of limestone, and further improve the remineralization efficiency of desalted water.
Drawings
FIG. 1 is a schematic diagram of an apparatus for use in a method of remineralization of desalinated water as used in embodiments of the present invention;
wherein, 1-a desalted water storage container; 2-a desalted water sampling port; 3-a desalinated water supply pump; 4-desalinated water flow meter; 5-limestone powder particle tank; 6-slurry stirring tank; 7-a slurry storage container; 8-a serum sampling port; 9-a slurry pump; 10-a mud flow meter; 11-a mixing pump for desalinated water and limestone milk; 12-a carbon dioxide gas storage container; 13-a pressure valve; 14-a pressure indicator; 15-a carbon dioxide gas flow meter; 16-carbon dioxide filling check valve; a 17-dilute acid aqueous solution storage tank; 18-a liquid flow meter; 19-a clarification tank; 20-a sampling port; 21-contact filter water inlet flow meter; 22-a contact filter; 23-a filter water outlet flow meter; 24-a filter water outlet sampling port; 25-carbon dioxide degassing and recovering unit; 26-a pH neutralization unit; 27-mineralized water sampling port; 28-an ultrafiltration unit; 29-a remineralization terminal water storage tank; 30-backwashing water inlets of the filter; 31-backwashing a water outlet of the filter; 32-dilute acid delivery pump;
FIG. 2 is a schematic view of a contact filter assembly used in an embodiment of the present invention.
Detailed Description
The invention provides a method for remineralizing desalted water by limestone whey, which comprises the following steps:
(1) mixing the limestone slurry with the desalted water to form limestone slurry; the limestone whey comprises limestone and water, the particle size of the limestone is less than or equal to 3 mu m, and the mass percentage content of the limestone in the limestone whey is less than or equal to 25 percent;
(2) mixing an acid agent and the limestone water slurry for mineralization, wherein the acid agent comprises carbon dioxide and/or dilute acid water solution.
In the present invention, the starting materials are all commercially available products well known to those skilled in the art, unless otherwise specified.
Mixing limestone slurry and desalted water (hereinafter referred to as first mixing) to form limestone slurry; the limestone whey comprises limestone and water, the particle size of the limestone is less than or equal to 3 mu m, and the mass percentage content of the limestone in the limestone whey is less than or equal to 25 percent.
In the present invention, the limestone slurry comprises limestone and water.
In the invention, the particle size of the limestone is less than or equal to 3 μm, and preferably 1-3 μm.
In the present invention, CaCO is contained in the limestone3The content by mass of (B) is preferably not less than 97.5%, more preferably not less than 98%.
In the invention, the density of the limestone is preferably 2.5-2.7 g/cm3More preferably 2.55 to 2.65g/cm3。
In the present invention, the method for preparing limestone preferably comprises the steps of:
and drying, grinding and screening the limestone particles in sequence.
In the present invention, the grinding is preferably ball milling, and the present invention has no special requirements for the specific implementation processes of the drying, ball milling and sieving.
In the present invention, the water is preferably desalinated water to be treated.
In the invention, the mass percentage of limestone in the limestone whey is less than or equal to 25%, and preferably 20-25%.
The desalted water remineralization method provided by the invention preferably selects CaCO in the limestone3The mass percentage of the limestone is preferably more than or equal to 97.5 percent, and the density of the limestone is preferably 2.5-2.7 g/cm3And is more beneficial to the dissolution of limestone in the desalted water.
In the present invention, the method for preparing limestone whey preferably comprises: and mixing the limestone and water for pulping, wherein the time for pulping by mixing is preferably more than or equal to 20 min.
In the present invention, the limestone milk is preferably pre-pulped or on-site pulped, more preferably on-site pulped.
In the present invention, the limestone slurry is preferably injected at a flow rate of 200 to 400mL/min, more preferably 215 to 380mL/min, during the first mixing.
The invention has no special requirements on the source of the desalted water.
In the invention, the injection flow rate of the desalted water during the first mixing is preferably 8-15L/min, and more preferably 10L/min.
In the invention, the volume ratio of the limestone whey to the desalted water is preferably (0.02-0.04): 1, and more preferably (0.024-0.035): 1.
In the present invention, the mixing of the limestone slurry and the desalinated water is preferably carried out in a mixing pump, and the present invention preferably conveys the formed limestone-water slurry to a clarification tank.
After limestone water slurry is obtained, the acid agent including carbon dioxide and/or dilute acid aqueous solution is mixed with the limestone water slurry (hereinafter referred to as second mixing) to accelerate dissolution of limestone and obtain remineralized water.
In the present invention, the acid agent comprises carbon dioxide and/or a dilute aqueous acid.
In the present invention, the dilute aqueous acid solution is preferably dilute sulfuric acid and/or aqueous carbonated solution, more preferably dilute sulfuric acid.
In the invention, the molar concentration of the dilute acid aqueous solution is preferably 0.9-3.2 mmol/L, and more preferably 1-3 mmol/L.
In the present invention, when the acid agent is preferably carbon dioxide, the molar ratio of limestone and carbon dioxide in the limestone whey is preferably 1 (0.4-2), and more preferably 1 (0.5-1.7).
In the present invention, when the acid agent is a dilute aqueous acid solution, the limestone in the limestone whey and the H in the dilute aqueous acid solution+The molar ratio of (A) to (B) is 1 (0.2 to 1.4), and more preferably 1 (0.25 to 1.3).
In the present invention, the second mixing is preferably performed by injecting an acid agent into the limestone water slurry, and the injection flow rate of the acid agent is preferably 0.015 to 0.4L/min, and more preferably 0.02 to 0.35L/min.
In the present invention, the injection is preferably an acid agent from the bottom of the limestone water slurry.
In the present invention, the acid agent and the limestone water slurry are mixed to obtain a clarified liquid, and the present invention preferably further comprises filtering the clarified liquid to obtain the remineralized water; during the filtration, the flow rate of the clarified liquid is less than or equal to 11L/min; the filtering medium comprises one or more of gravel, quartz sand and limestone, the particle sizes of the gravel and the quartz sand are independently 1-10 mm, and the particle size of the limestone is 1-3 mm.
In the present invention, the flow rate of the clarified liquid during the filtration is preferably not more than 11L/min, and more preferably 8 to 11L/min.
In the present invention, the filter medium preferably includes one or more of gravel, silica sand, and limestone, and more preferably includes silica sand or limestone.
In the present invention, the particle size of the gravel is preferably 1 to 10mm, and more preferably 2 to 6 mm.
In the invention, the particle size of the quartz sand is preferably 1-10 mm, and more preferably 2-6 mm.
In the invention, the particle size of the limestone is 1-3 mm, and more preferably 1.5-2 mm.
The present invention preferably reduces the turbidity of the remineralized water by said filtering.
In the present invention, the filtration is performed to obtain a filtrate, and the present invention preferably further comprises neutralizing the filtrate with a pH value to obtain the remineralized water.
In bookIn the invention, the pH neutralization alkaline agent preferably comprises NH4OH solution, KOH solution, Na2CO3Solutions or NaOH solutions.
In the present invention, the NH4OH solution, KOH solution, Na2CO3The mass percentage of the solution or the NaOH solution is preferably 3-25%, and more preferably 5-20%.
In the present invention, the pH is adjusted to a neutralization level to obtain a neutralized solution, and the present invention preferably further comprises subjecting the neutralized solution to ultrafiltration to obtain the remineralized water.
In the present invention, the pore size of the ultrafiltration membrane is preferably 0.1 to 2 μm.
In the present invention, the material of the ultrafiltration membrane preferably comprises porous ceramic and/or synthetic polymer; the synthetic polymer preferably comprises one or more of polyethylene, polypropylene, polytetrafluoroethylene, and the like.
The invention further reduces the turbidity of the mineralized water and removes microorganisms, bacteria and pathogenic bacteria in the remineralized water through ultrafiltration.
In the present invention, the water quality parameters of the remineralized water preferably include: the pH value is preferably 6.0-9.5 as CaCO3The total hardness is preferably 60-120 mg/L as CaCO3The alkalinity is preferably 50-150 mg/L, Ca2+The concentration is preferably 21 to 45mg/L, the Total Dissolved Solids (TDS) is preferably 100 to 500mg/L, the turbidity is preferably < 0.2NTU, and the Langerl saturation index (LSI index) is preferably-0.2 to 0.2.
The invention provides a device for a method for desalinating desalinated water by using limestone whey, which comprises the following steps:
a clarifier 19, said clarifier 19 provided with a first liquid inlet, a second liquid inlet, a gas inlet and an outlet;
the outlet of the desalted water storage container 1 is communicated with the first liquid inlet of the clarification tank 19;
a slurry storage vessel 7 having an outlet in communication with a first liquid inlet of said clarifier 19;
the device also comprises a carbon dioxide gas storage container 12 with an outlet communicated with the gas inlet of the clarification tank 19 and/or a dilute acid water solution storage tank 17 with an outlet communicated with the second liquid inlet of the clarification tank 19.
The device provided by the invention comprises a desalted water storage container 1, wherein the desalted water storage container 1 is preferably further provided with a desalted water sampling port 2, a first outlet and a second outlet.
In the present invention, the material of the desalinated water storage container 1 is preferably stainless steel, Fiber Reinforced Plastic (FRP) or PVC.
In the present invention, the pipe material of the pipeline communicating with the desalinated water storing container 1 is preferably stainless steel, fiber reinforced composite (FRP), PVC or epoxy resin lined pipe.
The device provided by the invention preferably further comprises a desalted water supply pump 3 communicated with the first outlet of the desalted water storage container 1, a desalted water flow meter 4 is arranged on an outlet pipeline of the desalted water supply pump 3, and the desalted water supply pump 3 is used for conveying the desalted water.
The apparatus provided by the present invention preferably further comprises a slurry agitation tank 6 having a liquid inlet in communication with the second outlet of the desalinated water storage tank 1, wherein in the present invention, the slurry agitation tank 6 is used for forming the limestone slurry.
The device provided by the invention preferably further comprises a limestone powdery particle tank 5 with a discharge port communicated with the solid inlet of the slurry stirring tank 6, and the limestone powdery particle tank 5 is preferably used for storing limestone particles.
The device provided by the invention comprises a slurry storage container 7 with an inlet communicated with the outlet of the slurry stirring tank 6, and the slurry storage container 7 is preferably also provided with a milk sampling port 8.
The device provided by the invention preferably further comprises a slurry pump 9 with an inlet communicated with the outlet of the slurry storage container 7, a slurry flow meter 10 is arranged on an outlet pipeline of the slurry pump 9, and the slurry pump 9 is used for conveying the limestone slurry.
The device provided by the invention preferably further comprises a desalted water and limestone-milk mixing pump 11, the inlet of which is simultaneously communicated with the outlet of the desalted water supply pump 3 and the outlet of the slurry pump 9, and the desalted water and limestone-milk mixing pump 11 is used for mixing the desalted water and limestone milk.
The device provided by the invention comprises a clarification tank 19, wherein a first liquid inlet is communicated with an outlet of the desalinated water and limestone-whey mixing pump 11, and the clarification tank 19 comprises a first liquid inlet, a second liquid inlet, a gas inlet and an outlet; the clarifier 19 is preferably also provided with a sampling port 20. The outlet pipe of the clarifier 19 is preferably provided with a contact filter inlet flow meter 21.
The device provided by the invention also comprises a carbon dioxide gas storage container 12 of which the outlet is communicated with the gas inlet of the clarification tank 19, and a pressure valve 13, a pressure indicator 14, a carbon dioxide gas flowmeter 15 and a carbon dioxide filling check valve 16 are sequentially arranged on the outlet pipeline of the carbon dioxide gas storage container 12.
And/or a dilute acid water solution storage tank 17 with an outlet communicated with a second liquid inlet of the clarification tank 19, wherein a dilute acid delivery pump 32 and a liquid flowmeter 18 are sequentially arranged on an outlet pipeline of the dilute acid water solution storage tank 17.
The device provided by the invention preferably further comprises a contact filter 22 with an inlet communicated with an outlet of the clarification tank 19, and the empty bed contact time of the contact filter 22 is 20-25 min. In the present invention, the contact filter 22 preferably adopts an upflow mode.
In the present invention, the contact filter 22 preferably comprises 5 filter tubes with a radius of 12.5cm and a length of 1m, which are connected in series and are provided with a filter medium therein. The tube of the contact filter 22 is preferably made of Fiber Reinforced Plastic (FRP), and more preferably made of glass Fiber Reinforced Plastic (FRP) or polypropylene (pp).
In the present invention, the contact filter 22 is preferably further provided with a filter outlet sampling port 24, a filter backwashing water inlet 30, a filter backwashing water outlet 31, a waste gas outlet, and a filtrate outlet, and the filtrate outlet pipeline is provided with a filter outlet flow meter 23.
The apparatus provided by the present invention preferably further comprises a carbon dioxide degassing and recovering unit 25 having a gas inlet communicating with the exhaust gas outlet of the contact filter 22, and the present invention has no particular requirement for the arrangement of the components of the carbon dioxide degassing and recovering unit 25, and the components are connected by means conventional in the art.
The apparatus provided by the present invention preferably further comprises a pH neutralization unit 26 having a liquid inlet in communication with the filtrate outlet of the contact filter 22, and the pH neutralization unit 26 is preferably further provided with a mineralized water sampling port 27.
The apparatus provided by the present invention preferably further comprises an ultrafiltration unit 28 having a liquid inlet in communication with the liquid outlet of the pH neutralization unit 26.
The apparatus provided by the present invention preferably further comprises a remineralizing dead-end water storage tank 29 having a liquid inlet in communication with the liquid outlet of the ultrafiltration unit 28.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
A 120L desalinated water storage container 1 which is used for conveying desalinated water at the flow rate of 10L/min; a slurry storage container 7 containing 10L of limestone slurry, which conveys the limestone slurry at a flow rate of 200 mL/min; mixing and pumping limestone whey and desalted water into a clarification tank 19 through a desalted water and limestone whey mixing pump, simultaneously introducing carbon dioxide and pumping sulfuric acid into the clarification tank 19, wherein the flow rate of the carbon dioxide is 0.02L/min, the flow rate of the sulfuric acid is 15mL/min, after a clarified liquid is obtained, injecting the clarified liquid into an upflow contact filter at the flow rate of 11L/min, wherein the contact filter is formed by connecting 5 filter pipes with the radius of 12.5cm and the length of 1m in parallel, quartz sand with the particle size of 1-10 mm is filled in each filter pipe, the empty bed contact time of the contact filter is 23min, remineralized water is obtained, and the water quality parameters of the remineralized water are as follows: pH 6.0-9.5 with CaCO3The total hardness is 60-120 mg/L as CaCO3The alkalinity is 50-150 mg/L, Ca2+The concentration is 21-45 mg/L, TDS is 100-500 mg/L, turbidity is preferably less than 0.2NTU, and LSI index is-0.2.
Example 2
A 120L desalinated water storage container 1 which is used for conveying desalinated water at the flow rate of 10L/min; a thick liquid storage container that holds 10L lime stone whey7, conveying limestone milk at a flow rate of 400 mL/min; mixing and pumping limestone whey and desalted water into a clarification tank 19 through a desalted water and limestone whey mixing pump, simultaneously introducing carbon dioxide and pumping sulfuric acid into the clarification tank 19, wherein the flow rate of the carbon dioxide is 0.4L/min, the flow rate of the sulfuric acid is 100mL/min, obtaining a clarified liquid, injecting the clarified liquid into an upflow contact filter at the flow rate of 11L/min, wherein the contact filter is formed by connecting 5 filter pipes with the radius of 12.5cm and the length of 1m in parallel, quartz sand with the particle size of 1-10 mm is filled in each filter pipe, the empty bed contact time of the contact filter is 23min, obtaining a filtrate, neutralizing the pH value of the filtrate, and taking an alkaline agent as NH with the mass percentage of 3%4And (3) obtaining a neutralized solution by using the OH solution, and performing ultrafiltration on the neutralized solution, wherein the aperture of an ultrafiltration membrane for ultrafiltration is 0.1-2 mu m. The ultrafiltration membrane is made of porous ceramic; obtaining the remineralized water, wherein the water quality parameters of the remineralized water are as follows: pH 6.0-9.5 with CaCO3The total hardness is 60-120 mg/L as CaCO3The alkalinity is 50-150 mg/L, Ca2+The concentration is 21-45 mg/L, TDS is 100-500 mg/L, turbidity is preferably less than 0.2NTU, and LSI index is-0.2.
Example 3
A 120L desalinated water storage container 1 which is used for conveying desalinated water at the flow rate of 10L/min; a slurry storage container 7 containing 10L of limestone slurry, which conveys the limestone slurry at a flow rate of 200 mL/min; mixing and pumping limestone whey and desalted water into a clarification tank 19 through a desalted water and limestone whey mixing pump, simultaneously introducing carbon dioxide and pumping sulfuric acid into the clarification tank 19, wherein the flow rate of the carbon dioxide is 0.02L/min, the flow rate of the sulfuric acid is 15mL/min, obtaining a clarified liquid, injecting the clarified liquid into an upflow contact filter at the flow rate of 11L/min, wherein the contact filter is formed by connecting 5 filter pipes with the radius of 12.5cm and the length of 1m in parallel, quartz sand with the particle size of 1-10 mm is filled in each filter pipe, the empty bed contact time of the contact filter is 23min, obtaining a filtrate, neutralizing the pH value of the filtrate, and taking an alkaline agent as NH with the mass percentage of 3 percent4And (3) obtaining a neutralized solution by using the OH solution, and performing ultrafiltration on the neutralized solution, wherein the aperture of an ultrafiltration membrane for ultrafiltration is 0.1-2 mu m. The ultrafiltration membrane is made of porous ceramic; obtaining remineralized water, water of the remineralized waterQuality parameters are as follows: pH 6.0-9.5 with CaCO3The total hardness is 60-120 mg/L as CaCO3The alkalinity is 50-150 mg/L, Ca2+The concentration is 21-45 mg/L, TDS is 100-500 mg/L, turbidity is preferably less than 0.2NTU, and LSI index is-0.2.
Example 3
A 120L desalted water storage container 1, wherein a desalted water supply pump 3 communicated with the outlet of the inlet desalted water storage container 1 conveys the desalted water to a desalted water and limestone-whey mixing pump 11 at the flow rate of 10L/min;
a limestone powder particle tank 5 containing limestone powder particles, a discharge port of which is communicated with a solid inlet of a slurry stirring tank 6, a liquid inlet of the slurry stirring tank 6 is communicated with a desalted water storage container 1, desalted water and the limestone powder particles are mixed in the slurry stirring tank 6 to obtain limestone whey, the limestone whey is conveyed to a slurry storage container 7 of the limestone whey, and the limestone whey is conveyed from the slurry storage container 7 to a mixing pump 11 of the desalted water and the limestone whey at the flow rate of 200mL/min by a slurry pump 9;
mixing the desalted water and limestone whey by a desalted water and limestone whey mixing pump 11, conveying the mixture to a clarification tank 19, introducing carbon dioxide and pumping sulfuric acid into the clarification tank 19 at the same time, wherein the flow rate of the carbon dioxide is 0.02L/min, the flow rate of the sulfuric acid is 15mL/min to obtain a clarified liquid, injecting the clarified liquid into an upflow contact filter at the flow rate of 11L/min, the contact filter is formed by connecting 5 filter pipes with the radius of 12.5cm and the length of 1m in parallel, quartz sand with the particle size of 1-10 mm is filled in the filter pipes, the empty bed contact time of the contact filter is 23min to obtain a filtrate, neutralizing the pH value of the filtrate, and taking an alkaline agent as NH with the mass percentage of 3 percent4OH solution to obtain remineralized water, wherein the water quality parameters of the remineralized water are as follows: pH 6.0-9.5 with CaCO3The total hardness is 60-120 mg/L as CaCO3The alkalinity is 50-150 mg/L, Ca2+The concentration is 21-45 mg/L, TDS is 100-500 mg/L, turbidity is preferably less than 0.2NTU, and LSI index is-0.2.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for desalinating desalted water by using limestone whey is characterized by comprising the following steps:
(1) mixing the limestone slurry with the desalted water to form limestone slurry; the limestone whey comprises limestone and water, the particle size of the limestone is less than or equal to 3 mu m, and the mass percentage content of the limestone in the limestone whey is less than or equal to 25 percent;
(2) mixing an acid agent and the limestone water slurry to accelerate limestone dissolution mineralization, wherein the acid agent comprises carbon dioxide and/or dilute acid water solution.
2. The method for remineralizing desalinated water by using limestone whey according to claim 1, wherein the volume ratio of the limestone whey to the desalinated water is (0.02-0.04): 1.
3. The method for remineralizing desalinated water using limestone milk according to claim 1 or 2, wherein in the step (1), the limestone milk is injected at a flow rate of 200 to 400mL/min during the mixing.
4. The method for remineralizing desalinated water by using limestone whey according to claim 1 or 2, wherein in the step (1), the injection flow rate of the desalinated water during the mixing is 8-15L/min.
5. The method for remineralizing desalinated water using limestone slurry according to claim 1, wherein when the acid agent is carbon dioxide, the molar ratio of limestone to carbon dioxide in the limestone slurry is 1 (0.4-2);
when the acid agent is a dilute acid aqueous solution, the dilute acid aqueous solution is a dilute sulfuric acid and/or carbonic acid aqueous solution, the molar concentration of the dilute acid aqueous solution is 0.9-3.2 mmol/L, and the lime isLimestone in stone milk slurry and H in dilute acid aqueous solution+The molar ratio of (1) is (0.2-1.4).
6. The method for remineralizing desalinated water using limestone slurry according to claim 1 or 5, wherein the mixing in the step (2) is performed by injecting an acid agent into the limestone slurry at an injection flow rate of 0.015 to 0.4L/min, the acid agent being injected from the bottom of the limestone slurry.
7. The method of remineralizing desalinated water using limestone slurry according to claim 1, wherein said acid agent is mixed with said limestone slurry to form a clarified liquid, further comprising filtering said clarified liquid; during the filtration, the flow rate of the clarified liquid is less than or equal to 11L/min; the filtering medium comprises one or more of gravel, quartz sand and limestone, the particle sizes of the gravel and the quartz sand are independently 1-10 mm, and the particle size of the limestone is 1-3 mm.
8. The method of claim 1, wherein the limestone comprises CaCO as a component of limestone3The mass percentage content of the limestone is more than or equal to 97.5 percent, and the density of the limestone is 2.5-2.7 g/cm3。
9. An apparatus for use in a method of remineralising desalinated water using limestone slurry according to claim 1, comprising:
a clarifier (19), said clarifier (19) provided with a first liquid inlet, a second liquid inlet, a gas inlet and an outlet;
a desalinated water storage container (1) with an outlet communicated with the first liquid inlet of the clarification tank (19);
a slurry storage vessel (7) having an outlet in communication with the first liquid inlet of the clarifier (19);
the device also comprises a carbon dioxide gas storage container (12) with an outlet communicated with the gas inlet of the clarification tank (19) and/or a dilute acid water solution storage container (17) with an outlet communicated with the second liquid inlet of the clarification tank (19).
10. The apparatus of claim 9, further comprising:
and the inlet of the contact filter (22) is communicated with the outlet of the clarification tank (19), and the empty bed contact time of the contact filter (22) is 20-25 min.
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