CN111268823B - Method for treating softened drinking water - Google Patents
Method for treating softened drinking water Download PDFInfo
- Publication number
- CN111268823B CN111268823B CN202010161304.1A CN202010161304A CN111268823B CN 111268823 B CN111268823 B CN 111268823B CN 202010161304 A CN202010161304 A CN 202010161304A CN 111268823 B CN111268823 B CN 111268823B
- Authority
- CN
- China
- Prior art keywords
- water
- raw water
- minutes
- activated carbon
- ozone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a drinking water softening treatment method, which comprises the following steps: (1) pre-ozone treatment; (2) coagulating and precipitating; (3) post-ozone treatment; (4) filtering the carbon sand; (5) and (5) membrane filtration. The method for treating softened drinking water has the advantages of low technical cost, high precipitation efficiency, capability of effectively removing micro particles and suspended matters in raw water, effective reduction of transparency, turbidity, organic pollutants and bacteria content of water, remarkable treatment effect, and effluent meeting sanitary standards for drinking water.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for treating softened drinking water.
Background
The water extracted from a water source is delivered into a water pipe after coagulation, precipitation, filtration and disinfection treatment of a water plant and then delivered into a user's home, a common polyaluminum trichloride flocculation purifying agent in the water source coagulation and free residual chlorine and the like generated after pre-chlorination disinfection treatment, and a water delivery pipe network and an unmanned cleaning water tank in the running water preparation process and aging inevitably cause' secondary pollution 'of the running water, so that the running water delivered into the user's home cannot be directly drunk, usually people only boil the boiled water and directly drink the boiled water, but the boiled water is not only troublesome and only plays a role in disinfection and sterilization, heavy metals and various harmful substances in the running water cannot be eliminated, and the running water which is not treated for a long time can cause harm to the body; therefore, a method for treating drinking water which is convenient, practical and can be directly drunk is urgently needed.
The invention of application No. 201711126896.8 discloses a drinking water treatment method, which comprises the following steps: a. and (3) precipitation: polyaluminium chloride and kaolin are used as coagulant aids for coagulation treatment of raw water, the mass ratio of the coagulant aids to water is 0.6%, and the raw water is stirred for 18 minutes by a stirrer; b. physical filtration: b, enabling the water obtained by the treatment in the step a to flow into a filtering chamber, and sequentially carrying out sand filtering, activated carbon filtering and fiber membrane filtering in the filtering chamber; c. reverse osmosis filtration: b, enabling the water treated in the step b to flow into a reverse osmosis filter chamber by using the high-pressure pump, wherein the pressure is 2 MPa; the filtering layer in the reverse osmosis filtering chamber is a 0.02 micron microporous filtering membrane; d. and (5) performing disinfection treatment. The invention can solve the problems that tap water is inconvenient to drink and secondary pollution of the tap water causes harm to human bodies.
The invention with application number 200810209848.X discloses a drinking water treatment method combining photocatalysis and biology, and solves the problems of high photocatalytic water treatment cost, low degradation efficiency of refractory organic matters, poor ammonia nitrogen removal effect and overproof microorganisms in water treated by a biological method. The method comprises the following steps: 1. carrying out photocatalytic reaction treatment on raw water by using a photocatalytic reactor; 2. performing biological treatment on the water treated in the step one; 3. the effluent after biological treatment flows back to the photocatalytic reactor for sterilization, thus realizing the treatment of the raw water.
Disclosure of Invention
The invention aims to solve the technical problem of providing a drinking water softening treatment method, which comprises the following steps:
(1) pre-ozone treatment;
(2) coagulating and precipitating;
(3) post-ozone treatment;
(4) filtering the carbon sand;
(5) and (5) membrane filtration.
As a preferable technical solution of the present invention, the drinking water softening treatment method includes the steps of:
step I: introducing raw water into a pre-ozone column, introducing 1.8-2.5 mg of ozone into each liter of raw water, allowing the raw water to stay for 2-5 minutes, and discharging water to obtain raw water subjected to pre-ozone treatment;
step II: introducing the raw water subjected to ozone pretreatment into a coagulation tank, adding 20-50 mg of a coagulant into each liter of raw water, stirring for 10-30 seconds at 200-300 revolutions per minute, stirring for 2-3 minutes at 100-150 revolutions per minute, stirring for 10-20 minutes at 30-50 revolutions per minute, standing and settling for 30-60 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the coagulated raw water into a rear ozone column, introducing 1.8-2.5 mg of ozone into each liter of raw water, allowing the raw water to stay for 10-15 minutes, and discharging water to obtain the raw water subjected to rear ozone treatment;
step IV: and (2) introducing the raw water subjected to the ozone treatment into a filtering column filled with an activated carbon filtering material and quartz sand in sequence from an inlet to an outlet, wherein the filling height ratio of the activated carbon filtering material to the quartz sand is (1-2): 1, the total filling height of the activated carbon filter material and the quartz sand accounts for 0.4-0.7 time of the height of the filter column, and the filtering speed is 10-30 m/h, so that raw water treated by the carbon sand is obtained;
step V: and (3) passing the raw water treated by the carbon sand through a filtering membrane with the aperture of 0.1-0.4 mu m, and obtaining the softened drinking water under the operation pressure of 0.1-0.3 MPa.
As a preferable technical solution of the present invention, the drinking water softening treatment method includes the steps of:
step I: introducing raw water into a pre-ozone column, introducing 1.8-2.5 mg of ozone into each liter of raw water, allowing the raw water to stay for 2-5 minutes, and discharging water to obtain raw water subjected to pre-ozone treatment;
step II: introducing the raw water subjected to ozone pretreatment into a coagulation tank, adding 20-50 mg of a coagulant into each liter of raw water, stirring for 10-30 seconds at 200-300 revolutions per minute, stirring for 2-3 minutes at 100-150 revolutions per minute, stirring for 10-20 minutes at 30-50 revolutions per minute, standing and settling for 30-60 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the coagulated raw water into a rear ozone column, introducing 1.8-2.5 mg of ozone into each liter of raw water, allowing the raw water to stay for 10-15 minutes, and discharging water to obtain the raw water subjected to rear ozone treatment;
step IV: and (2) introducing the raw water subjected to the ozone treatment into a filter column filled with an activated carbon filter material, a hydroxyapatite filter material and quartz sand in sequence from an inlet to an outlet, wherein the filling height ratio of the activated carbon filter material to the hydroxyapatite filter material to the quartz sand is (1-2): (0.8-1.5): 1, the total filling height of the activated carbon filter material, the hydroxyapatite and the quartz sand accounts for 0.4-0.7 time of the height of the filter column, and the filtering speed is 10-30 m/h, so that raw water treated by the carbon sand is obtained;
step V: and (3) passing the raw water treated by the carbon sand through a filtering membrane with the aperture of 0.1-0.4 mu m, and obtaining the softened drinking water under the operation pressure of 0.1-0.3 MPa.
In some technical schemes of the invention, the hydroxyapatite filter material is prepared by the following method: dissolving 4-8 mL of oleic acid in 6-20 mL of absolute ethanol to obtain a mixed system of ethanol and oleic acid; dissolving 0.3-0.6 g of sodium hydroxide in 6-20 mL of water to obtain a sodium hydroxide solution; dissolving 0.1-0.3 g of calcium chloride in 6-20 mL of water to obtain a calcium chloride solution; dissolving 0.1-0.3 g of monocalcium phosphate in 6-20 mL of water to obtain a monocalcium phosphate solution; sequentially adding a sodium hydroxide solution, a calcium chloride solution and a monocalcium phosphate solution into a mixed system of ethanol and oleic acid, heating to 160-190 ℃, and reacting at 160-190 ℃ for 12-24 hours; and naturally cooling to room temperature, sequentially washing the obtained reaction product with absolute ethyl alcohol and water, drying at 50-60 ℃, and crushing and sieving to obtain the catalyst.
In some technical schemes of the invention, the hydroxyapatite filter material is prepared by the following method:
(1) dissolving 4-8 mL of oleic acid in 6-20 mL of absolute ethanol to obtain a mixed system of ethanol and oleic acid; dissolving 0.3-0.6 g of sodium hydroxide in 6-20 mL of water to obtain a sodium hydroxide solution; dissolving 0.1-0.3 g of calcium chloride in 6-20 mL of water to obtain a calcium chloride solution; dissolving 0.1-0.3 g of monocalcium phosphate in 6-20 mL of water to obtain a monocalcium phosphate solution; sequentially adding a sodium hydroxide solution, a calcium chloride solution and a monocalcium phosphate solution into a mixed system of ethanol and oleic acid, heating to 160-190 ℃, and reacting at 160-190 ℃ for 12-24 hours; then naturally cooling to room temperature, sequentially washing the obtained reaction product with absolute ethyl alcohol and water, drying at 50-60 ℃, and crushing and sieving to obtain a hydroxyapatite filter material matrix;
(2) dispersing 0.02-0.06 g of aluminum sulfate and the obtained hydroxyapatite filter material matrix into 100mL of deionized water, adding sodium hydroxide to adjust the pH value to 7, and stirring for reaction for 1-3 hours; centrifugally separating the reacted solution, and collecting bottom precipitate; and (3) sequentially cleaning the bottom precipitate with absolute ethyl alcohol and water, drying at 50-60 ℃, and crushing and sieving to obtain the nano-silver-containing nano-silver.
Further, the activated carbon filter material is coal granular activated carbon or coal granular activated carbon modified by amide and carboxylic acid copolymerization.
Further, the amide and carboxylic acid copolymerization modified coal granular activated carbon is prepared by the following method: washing the coal granular activated carbon with water, and then drying for 8-12 hours at 50-60 ℃ to obtain dried coal granular activated carbon; weighing 0.15-0.55 g of acrylic acid, 0.04-0.28 g of methacrylamide and 0.1-0.3 g N, dissolving N-methylene bisacrylamide in 20-50 mL of water, and performing ultrasonic treatment for 20-40 minutes to obtain a mixed solution; weighing 10-50 g of dry coal granular activated carbon, adding the dry coal granular activated carbon into the mixed solution, adding 80-200 mL of water, heating to 40-50 ℃ under the condition of mechanical stirring, and stirring and reacting for 20-30 minutes at 40-50 ℃; then adding 0.1-0.2 g of initiator potassium persulfate, heating to 60-70 ℃, and reacting at the constant temperature of 60-70 ℃ for 2-3 hours; after the reaction is finished, performing centrifugal separation, and collecting bottom sediment; washing the bottom precipitate with water, soaking the bottom precipitate in 50-100 mL of sodium hydroxide aqueous solution with the pH value of 9-10, standing for 30-60 minutes, filtering, and collecting a filter cake; washing the filter cake with deionized water until the pH value of the washing liquid reaches 7-8, and drying at 50-60 ℃ for 8-12 hours to obtain the amide and carboxylic acid copolymerization modified activated carbon.
In the examples, it was found that when the sum of the mass of acrylic acid and methacrylamide was 5% of the mass of the activated carbon, the ratio of acrylic acid: the molar ratio of methacrylamide to acrylic acid is 3: 1, the surface performance of the coal granular activated carbon modified by amide and carboxylic acid copolymerization is optimal.
Further, the coagulant is one or a mixture of polyaluminium chloride and starch-based coagulant. Preferably, the coagulant is a starch-based coagulant and polyaluminium chloride in a mass ratio of 4: 1, in a mixture of the components.
Further, the preparation method of the starch-based coagulant comprises the following steps: weighing 2-10 g of starch, adding the starch into 100-300 mL of water, heating to 70-90 ℃, and stirring and pasting for 1-2 hours at 70-90 ℃; after pasting, introducing nitrogen, reducing the reaction temperature to 50-60 ℃, adding 4-10 g of an ammonium persulfate aqueous solution with the mass fraction of 2-5%, and reacting for 10-30 minutes to enable the initiator to fully react with the starch; adding a mixed monomer consisting of 0-25 g of acrylamide and 5-30 g of methacryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting at 50-60 ℃ for 3-4 hours after the addition is finished; after the reaction is finished, pouring the reaction product into 50-200 mL of acetone, fully stirring, standing for 30-60 minutes, and centrifuging to collect a bottom solid; and drying the bottom solid at 50-60 ℃, crushing and sieving to obtain the starch-based coagulant.
Further, the filtering membrane is a glass fiber filtering membrane.
Further, the filter membrane is a pretreated glass fiber filter membrane, and is prepared by the following method: firstly, soaking a glass fiber filtering membrane in 1-5 mol/L sodium hydroxide aqueous solution at 40-50 ℃ for 30-60 minutes, washing the glass fiber filtering membrane with water until the washing liquid is neutral, and drying to obtain the glass fiber filtering membrane treated by sodium hydroxide; secondly, soaking the glass fiber filtering membrane treated by sodium hydroxide in 1-5 mol/L acetic acid at 40-50 ℃ for 30-60 minutes, then washing the glass fiber filtering membrane by water until the washing liquor is neutral, and drying to obtain the acid-treated glass fiber filtering membrane; thirdly, mixing 2-5 g of silane coupling agent, 0.5-2 g of organosilicon quaternary ammonium salt, 70-80 mL of ethanol and 5-10 mL of water to prepare an antibacterial treatment solution, soaking the acid-treated glass fiber filter membrane in the antibacterial treatment solution for 5-10 minutes, taking out, and carrying out heat treatment at 110-120 ℃ for 100-150 minutes; and finally, washing the glass fiber filtering membrane after the heat treatment by using deionized water, and drying to obtain the pretreated glass fiber filtering membrane.
The method for treating softened drinking water has the advantages of low technical cost, high precipitation efficiency, capability of effectively removing micro particles and suspended matters in raw water, effective reduction of transparency, turbidity, organic pollutants and bacteria content of water, remarkable treatment effect, and effluent meeting sanitary standards for drinking water.
Detailed Description
The raw materials in the examples are as follows:
in the examples raw water was untreated groundwater.
Methacrylamide, CAS number: 79-39-0.
N, N-methylenebisacrylamide, CAS No.: 110-26-9.
Acrylic acid, CAS No.: 79-10-7.
Potassium persulfate, CAS number: 7727-21-1.
Polyaluminum chloride, manufacturer, grand source water purification material factory, CAS number: 1327-41-9, model HY-PAC, particle size 200 mesh.
Oleic acid, CAS number: 112-80-1.
Aluminum sulfate, CAS No.: 10043-01-3.
Starch, cat # 6545, density 1.25g/cm3The manufacturer Suzhou city is the chemical company Limited.
Acrylamide, CAS No.: 79-06-1.
Methacryloyloxyethyltrimethyl ammonium chloride, CAS No.: 5039-78-1.
Example 1
A method of treating softened drinking water comprising the steps of:
step I: introducing raw water
Introducing 1.8mg of ozone into each liter of raw water, staying for 5 minutes, and discharging water to obtain raw water after ozone treatment;
step II: introducing the raw water subjected to ozone treatment into a coagulation tank, adding 25mg of polyaluminum chloride into each liter of raw water, stirring for 30 seconds at 300 revolutions per minute, stirring for 3 minutes at150 revolutions per minute, stirring for 15 minutes at 50 revolutions per minute, standing and settling for 30 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the raw water after coagulation treatment
Introducing 2.5mg of ozone into each liter of raw water by the rear ozone column, keeping the ozone column for 10 minutes, and discharging water to obtain raw water treated by the rear ozone;
step IV: introducing the ozone-treated raw water into a quartz sand factory (average particle diameter of 0.95mm) filled with activated carbon filter material (coal granular activated carbon with particle size of 30 meshes, Jiangsu Yiqing activated carbon Co., Ltd.) and quartz sand (Tuo city Longyuan Quartz sand factory, Longchuan county, Ltd.) from inlet to outlet
The filling height of the active carbon filter material is 800mm, the filling height of the quartz sand is 400mm, and the filtering speed is 10m/h, so that raw water treated by the carbon sand is obtained;
step V: the raw water treated by the charcoal sand passes through a glass fiber filter membrane (Shenzhen Shanshun apparatus Co., Ltd., product name AT1504700) with the aperture of 0.1 μm and the operating pressure of 0.2MPa, so as to obtain the softened drinking water.
Example 2
A method of treating softened drinking water comprising the steps of:
step I: introducing raw water
Introducing 1.8mg of ozone into each liter of raw water, staying for 5 minutes, and discharging water to obtain raw water after ozone treatment;
step II: introducing the raw water subjected to ozone treatment into a coagulation tank, adding 25mg of polyaluminum chloride into each liter of raw water, stirring for 30 seconds at 300 revolutions per minute, stirring for 3 minutes at150 revolutions per minute, stirring for 15 minutes at 50 revolutions per minute, standing and settling for 30 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the raw water after coagulation treatment
Introducing 2.5mg of ozone into each liter of raw water by the rear ozone column, keeping the ozone column for 10 minutes, and discharging water to obtain raw water treated by the rear ozone;
step IV: introducing the ozone-treated raw water into a reactor filled with activated carbon filter material (coal granular activated carbon with particle size of 30 meshes, Jiangsu Yiqing activated carbon Co., Ltd.), hydroxyapatite filter material and quartz sand (Tuo city Longyuan Quartz Sand factory, Longchuan county, average particle size of 0.95mm) from inlet to outlet
The filling height of the active carbon filter material is 800mm, the filling height of the hydroxyapatite filter material is 500mm, the filling height of the quartz sand is 400mm, and the filtering speed is 10m/h, so that raw water treated by the carbon sand is obtained;
step V: the raw water treated by the charcoal sand passes through a glass fiber filter membrane (Shenzhen Shanshun apparatus Co., Ltd., product name AT1504700) with the aperture of 0.1 μm and the operating pressure of 0.2MPa, so as to obtain the softened drinking water.
The hydroxyapatite filter material is prepared by the following method: dissolving 6mL of oleic acid in 10mL of absolute ethyl alcohol to obtain a mixed system of ethyl alcohol and oleic acid; dissolving 0.5g of sodium hydroxide in 10mL of deionized water to obtain a sodium hydroxide solution; dissolving 0.11g of calcium chloride in 10mL of deionized water to obtain a calcium chloride solution; dissolving 0.12g of monocalcium phosphate in 10mL of deionized water to obtain a monocalcium phosphate solution; sequentially adding a sodium hydroxide solution, a calcium chloride solution and a calcium dihydrogen phosphate solution into a mixed system of ethanol and oleic acid, heating to 180 ℃ at the speed of 2 ℃/min, and reacting for 24 hours at 180 ℃; and naturally cooling to room temperature, sequentially washing the obtained reaction product with 50 times of anhydrous ethanol and 100 times of deionized water, drying at 60 ℃ for 24 hours, crushing, and sieving with a 30-mesh sieve to obtain the product.
Example 3
A method of treating softened drinking water comprising the steps of:
step I: introducing raw water
Introducing 1.8mg of ozone into each liter of raw water, staying for 5 minutes, and discharging water to obtain raw water after ozone treatment;
step II: introducing the raw water subjected to ozone treatment into a coagulation tank, adding 25mg of polyaluminum chloride into each liter of raw water, stirring for 30 seconds at 300 revolutions per minute, stirring for 3 minutes at150 revolutions per minute, stirring for 15 minutes at 50 revolutions per minute, standing and settling for 30 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the raw water after coagulation treatment
Introducing 2.5mg of ozone into each liter of raw water by the rear ozone column, keeping the ozone column for 10 minutes, and discharging water to obtain raw water treated by the rear ozone;
step IV: introducing the raw water treated by ozone into a filter material (coal granular active carbon with particle size of 30 meshes, Jiangsu Yiqing active carbon Co., Ltd., manufacturer), hydroxyapatite filter material and quartz sandHome Longchuan county Tuo city Longyuan quartz sand works, average particle size 0.95mm)
The filling height of the active carbon filter material is 800mm, the filling height of the hydroxyapatite filter material is 500mm, the filling height of the quartz sand is 400mm, and the filtering speed is 10m/h, so that raw water treated by the carbon sand is obtained;
step V: the raw water treated by the charcoal sand passes through a glass fiber filter membrane (Shenzhen Shanshun apparatus Co., Ltd., product name AT1504700) with the aperture of 0.1 μm and the operating pressure of 0.2MPa, so as to obtain the softened drinking water.
The hydroxyapatite filter material is prepared by the following method:
(1) dissolving 6mL of oleic acid in 10mL of absolute ethyl alcohol to obtain a mixed system of ethyl alcohol and oleic acid; dissolving 0.5g of sodium hydroxide in 10mL of deionized water to obtain a sodium hydroxide solution; dissolving 0.11g of calcium chloride in 10mL of deionized water to obtain a calcium chloride solution; dissolving 0.12g of monocalcium phosphate in 10mL of deionized water to obtain a monocalcium phosphate solution; sequentially adding a sodium hydroxide solution, a calcium chloride solution and a calcium dihydrogen phosphate solution into a mixed system of ethanol and oleic acid, heating to 180 ℃ at the speed of 2 ℃/min, and reacting for 24 hours at 180 ℃; then naturally cooling to room temperature, sequentially washing the obtained reaction product with absolute ethyl alcohol with the weight being 50 times of that of the reaction product and deionized water with the weight being 100 times of that of the reaction product, drying for 24 hours at 60 ℃, crushing and sieving with a 30-mesh sieve to obtain a hydroxyapatite filter material matrix;
(2) 0.028g of aluminum sulfate and the obtained hydroxyapatite filter material matrix are dispersed in 100mL of deionized water, sodium hydroxide is added to adjust the pH value to 7, and the mixture is stirred and reacts for 2 hours at 100 r/min; centrifuging the reacted solution at 4000 rpm for 30 minutes, and collecting bottom sediment; and (3) sequentially washing the bottom precipitate with 50 times of anhydrous ethanol and 100 times of deionized water, drying at 60 ℃ for 24 hours, crushing, and sieving with a 30-mesh sieve to obtain the product.
Examples 4 to 6
A method of treating softened drinking water comprising the steps of:
step I: mixing the raw waterIs introduced into
Introducing 1.8mg of ozone into each liter of raw water, staying for 5 minutes, and discharging water to obtain raw water after ozone treatment;
step II: introducing the raw water subjected to ozone treatment into a coagulation tank, adding 25mg of polyaluminum chloride into each liter of raw water, stirring for 30 seconds at 300 revolutions per minute, stirring for 3 minutes at150 revolutions per minute, stirring for 15 minutes at 50 revolutions per minute, standing and settling for 30 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the raw water after coagulation treatment
Introducing 2.5mg of ozone into each liter of raw water by the rear ozone column, keeping the ozone column for 10 minutes, and discharging water to obtain raw water treated by the rear ozone;
step IV: introducing the ozone-treated raw water into a Tuocheng Longyuan quartz sand factory (average particle diameter 0.95mm) filled with activated carbon filter material, hydroxyapatite filter material (prepared in the same example 3) and quartz sand (manufacturer, Longchuan county Longyuan Quartz sand factory)
The filling height of the active carbon filter material is 800mm, the filling height of the hydroxyapatite filter material is 500mm, the filling height of the quartz sand is 400mm, and the filtering speed is 10m/h, so that raw water treated by the carbon sand is obtained;
step V: the raw water treated by the charcoal sand passes through a glass fiber filter membrane (Shenzhen Shanshun apparatus Co., Ltd., product name AT1504700) with the aperture of 0.1 μm and the operating pressure of 0.2MPa, so as to obtain the softened drinking water.
The active carbon filter material is amide and carboxylic acid copolymerization modified coal granular active carbon, and is prepared by the following method: washing coal granular activated carbon (granularity of 30 meshes, Jiangsu Yiqing activated carbon Co., Ltd. of the manufacturer) with deionized water 100 times of the weight of the coal granular activated carbon, and drying the coal granular activated carbon in a blast drying oven at 60 ℃ for 12 hours to obtain dried coal granular activated carbon; weighing a certain amount of acrylic acid, a certain amount of methacrylamide and 0.1g N, N-methylene bisacrylamide, dissolving in 20mL of deionized water, and performing ultrasonic treatment for 20 minutes under the condition of ultrasonic power of 300W to obtain a mixed solution; weighing 10g of dry coal granular activated carbon, adding the dry coal granular activated carbon into the mixed solution, adding 80mL of deionized water, heating to 40 ℃ at a speed of 2 ℃/min under the condition of mechanical stirring at a speed of 400 r/min, and stirring and reacting for 20 min at 40 ℃; then adding 0.1g of initiator potassium persulfate, heating to 60 ℃ at the speed of 2 ℃/min, and reacting for 2 hours at the constant temperature of 60 ℃; after the reaction is finished, centrifuging at 3000 r/min for 20 min, and collecting bottom sediment; washing the bottom precipitate with deionized water 50 times the weight of the bottom precipitate, soaking in 50mL of sodium hydroxide aqueous solution with pH of 10, standing for 30 minutes, filtering with 200-mesh filter cloth, and collecting filter cake; washing the filter cake with deionized water until the pH value of a washing liquid reaches 8.0, and drying at 60 ℃ for 12 hours to obtain the amide and carboxylic acid copolymerization modified coal granular activated carbon.
Examples 4 to 6 the sum of the masses of acrylic acid and methacrylamide was 0.3g, with the difference that: acrylic acid in example 4: the molar ratio of methacrylamide to acrylic acid is 4: 1, the mass of acrylic acid is 0.24g, and the mass of methacrylamide is 0.06 g; acrylic acid in example 5: the molar ratio of methacrylamide to acrylic acid is 3: 1, the mass of acrylic acid is 0.21g, and the mass of methacrylamide is 0.09 g; acrylic acid in example 6: the molar ratio of methacrylamide to acrylic acid is 2: 1, the mass of acrylic acid is 0.19g, and the mass of methacrylamide is 0.11 g.
Examples 7 to 9
The softened drinking water treatment method is the same as example 4.
Examples 7 to 9 the sum of the masses of acrylic acid and methacrylamide was 0.5g, with the difference that: acrylic acid in example 7: the molar ratio of methacrylamide to acrylic acid is 4: 1, the mass of acrylic acid is 0.38g, and the mass of methacrylamide is 0.12 g; acrylic acid in example 8: the molar ratio of methacrylamide to acrylic acid is 3: 1, the mass of acrylic acid is 0.36g, and the mass of methacrylamide is 0.14 g; acrylic acid in example 9: the molar ratio of methacrylamide to acrylic acid is 2: 1, the mass of acrylic acid is 0.32g, and the mass of methacrylamide is 0.18 g.
Examples 10 to 12
The softened drinking water treatment method is the same as example 4.
Examples 10 to 12 the sum of the masses of acrylic acid and methacrylamide was 0.7g, with the difference that: acrylic acid in example 10: the molar ratio of methacrylamide to acrylic acid is 4: 1, the mass of acrylic acid is 0.54g, and the mass of methacrylamide is 0.16 g; acrylic acid in example 11: the molar ratio of methacrylamide to acrylic acid is 3: 1, the mass of acrylic acid is 0.50g, and the mass of methacrylamide is 0.20 g; acrylic acid in example 12: the molar ratio of methacrylamide to acrylic acid is 2: 1, the mass of acrylic acid is 0.44g, and the mass of methacrylamide is 0.26 g.
Specific surface area the specific surface area was calculated by the BET tester for nitrogen de-adsorption at 78K.
The specific test results are shown in table 1.
TABLE 1 specific surface area test table
As can be seen from Table 1, the amide and carboxylic acid copolymerization modified coal granular activated carbon increases and then decreases with the increase of the loading amount, and increases and then decreases with the increase of the monomer ratio. The sum of the masses of acrylic acid and methacrylamide in example 8 was 0.5g, acrylic acid: the molar ratio of methacrylamide to acrylic acid is 3: 1, the specific surface area of the coal granular activated carbon modified by the copolymerization of the amide and the carboxylic acid is maximized. The monomer acrylic acid, methacrylamide and a cross-linking agent N, N-methylene bisacrylamide are subjected to in-situ polymerization and sodium hydroxide neutralization reaction on the surface of the activated carbon to obtain the carboxylic acid and amide copolymer modified activated carbon. Compared with the blank active carbon, the modified active carbon obtained by in-situ polymerization has obviously enhanced adsorption capacity to impurities in water. The amide and carboxylic acid copolymerization modified coal granular activated carbon has the following characteristics: (1) the calcium magnesium phosphate has good adsorption performance on calcium magnesium particles in water; (2) the preparation process is green and environment-friendly, and the carboxylic acid and amide copolymer loaded on the inner surface and the outer surface of the active carbon is not easy to elute; (3) has long service life.
Example 13
A method of treating softened drinking water comprising the steps of:
step I: introducing raw water
Introducing 1.8mg of ozone into each liter of raw water, staying for 5 minutes, and discharging water to obtain raw water after ozone treatment;
step II: introducing the raw water subjected to ozone treatment into a coagulation tank, adding 25mg of polyaluminum chloride into each liter of raw water, stirring for 30 seconds at 300 revolutions per minute, stirring for 3 minutes at150 revolutions per minute, stirring for 15 minutes at 50 revolutions per minute, standing and settling for 30 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the raw water after coagulation treatment
Introducing 2.5mg of ozone into each liter of raw water by the rear ozone column, keeping the ozone column for 10 minutes, and discharging water to obtain raw water treated by the rear ozone;
step IV: introducing the raw water treated by ozone into a quartz sand factory (average particle diameter of 0.95mm) sequentially filled with activated carbon filter material (specifically carboxylic acid copolymerization modified coal granular activated carbon prepared in the same example 8), hydroxyapatite filter material (prepared in the same example 3) and quartz sand (manufacturer Longchuan county TuoChengyuan quartz sand factory, manufacturer)
The filling height of the active carbon filter material is 800mm, the filling height of the hydroxyapatite filter material is 500mm, the filling height of the quartz sand is 400mm, and the filtering speed is 10m/h, so that raw water treated by the carbon sand is obtained;
step V: and (3) passing the raw water treated by the carbon sand through a filtering membrane with the aperture of 0.1 mu m, and obtaining the softened drinking water under the operation pressure of 0.2 MPa.
The filter membrane is a pretreated glass fiber filter membrane and is prepared by the following method: firstly, soaking a glass fiber filtering membrane (Shenzhen Shanshun Instrument Limited, manufactured by manufacturer, No. AT1504700) in 4mol/L sodium hydroxide aqueous solution AT 50 ℃ for 30 minutes, cleaning the glass fiber filtering membrane by using water until the washing liquor is neutral, and drying the glass fiber filtering membrane AT 50 ℃ for 8 hours to obtain the glass fiber filtering membrane treated by the sodium hydroxide; secondly, soaking the glass fiber filtering membrane treated by sodium hydroxide in 4mol/L acetic acid at 50 ℃ for 30 minutes, then washing the glass fiber filtering membrane by water until the washing liquor is neutral, and drying the glass fiber filtering membrane for 8 hours at 50 ℃ to obtain the acid-treated glass fiber filtering membrane; thirdly, mixing 3g of a silane coupling agent (specifically using the silane coupling agent KH550, Zhengzhou Fengtheng chemical product Co., Ltd.) with 1g of organosilicon quaternary ammonium salt (specifically using dimethyl octadecyl [3- (trimethoxy silicon) propyl ] ammonium chloride, CAS No. 27668-52-6, Shandong Jiaying chemical product Co., Ltd.) to prepare an antibacterial treatment solution, 72mL of ethanol and 8mL of water, soaking the acid-treated glass fiber filtering membrane in the antibacterial treatment solution for 5 minutes, and performing heat treatment at 120 ℃ for 120 minutes to ensure that the silane coupling agent and the organosilicon quaternary ammonium salt have a grafting reaction with the glass fiber filtering membrane; and finally, washing the glass fiber filtering membrane after heat treatment by using deionized water, and drying for 8 hours at 50 ℃ to obtain the pretreated glass fiber filtering membrane.
Examples 14 to 19
A method of treating softened drinking water comprising the steps of:
step I: introducing raw water
Introducing 1.8mg of ozone into each liter of raw water, staying for 5 minutes, and discharging water to obtain raw water after ozone treatment;
step II: introducing the raw water subjected to ozone treatment into a coagulation tank, adding 25mg of starch-based coagulant into each liter of raw water, stirring for 30 seconds at 300 revolutions per minute, stirring for 3 minutes at150 revolutions per minute, stirring for 15 minutes at 50 revolutions per minute, standing and settling for 30 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the raw water after coagulation treatment
AfterOzone column, introducing 2.5mg of ozone into each liter of raw water, staying for 10 minutes, and discharging water to obtain raw water treated by ozone;
step IV: introducing the raw water treated by ozone into a quartz sand factory (average particle diameter of 0.95mm) sequentially filled with activated carbon filter material (specifically carboxylic acid copolymerization modified coal granular activated carbon prepared in the same example 8), hydroxyapatite filter material (prepared in the same example 3) and quartz sand (manufacturer Longchuan county TuoChengyuan quartz sand factory, manufacturer)
The filling height of the active carbon filter material is 800mm, the filling height of the hydroxyapatite filter material is 500mm, the filling height of the quartz sand is 400mm, and the filtering speed is 10m/h, so that raw water treated by the carbon sand is obtained;
step V: the raw water treated by the charcoal sand passes through a glass fiber filter membrane (Shenzhen Shanshun apparatus Co., Ltd., product name AT1504700) with the aperture of 0.1 μm and the operating pressure of 0.2MPa, so as to obtain the softened drinking water.
The filtration membrane was a pretreated glass fiber filtration membrane, and the same as in example 13 was prepared.
The preparation method of the starch-based coagulant comprises the following steps: weighing 5g of starch, adding the starch into 200mL of deionized water, heating to 80 ℃ at the speed of 2 ℃/min, and stirring and gelatinizing at the temperature of 80 ℃ at the speed of 130 r/min for 1 hour; after pasting, introducing nitrogen, reducing the reaction temperature to 55 ℃, adding 10g of ammonium persulfate aqueous solution with the mass fraction of 5%, and reacting for 10 minutes to ensure that the initiator and the starch are fully reacted; adding a certain amount of mixed monomer consisting of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting at 55 ℃ for 3 hours after the addition is finished; after the reaction is finished, pouring the reaction product into 60mL of acetone, fully stirring, standing for 40 minutes, centrifuging for 20 minutes at 3000 r/min, and collecting a bottom solid; and drying the bottom solid at 60 ℃ for 48 hours, crushing, and sieving by a 100-mesh sieve to obtain the starch-based coagulant.
Charge Density the charge density of cationic starch was determined by colloid titration, referred to colloid titration (Fine chemical, Vol.18, 2 nd 2001, 2 months).
The grafting length is referred to the study on the influence of the starch chain/branch structure on the structure and performance of the acrylamide graft copolymerization super absorbent resin (Zhoiwei Master thesis).
The specific test results are shown in table 2.
TABLE 2 starch-based coagulant test table
Example 20
A method of treating softened drinking water comprising the steps of:
step I: introducing raw water
Introducing 1.8mg of ozone into each liter of raw water, staying for 5 minutes, and discharging water to obtain raw water after ozone treatment;
step II: introducing the raw water subjected to the pre-ozone treatment into a coagulation tank, adding 25mg of coagulant into each liter of raw water, wherein the coagulant is a starch-based coagulant and polyaluminium chloride in a mass ratio of 4: 1 for 30 seconds at 300 revolutions per minute, for 3 minutes at150 revolutions per minute, for 15 minutes at 50 revolutions per minute, and standing and settling for 30 minutes to obtain water to obtain raw water after coagulation treatment;
step III: introducing the raw water after coagulation treatment
Introducing 2.5mg of ozone into each liter of raw water by the rear ozone column, keeping the ozone column for 10 minutes, and discharging water to obtain raw water treated by the rear ozone;
step IV: introducing the raw water treated by ozone into a quartz sand factory (average particle diameter of 0.95mm) sequentially filled with activated carbon filter material (specifically carboxylic acid copolymerization modified coal granular activated carbon prepared in the same example 8), hydroxyapatite filter material (prepared in the same example 3) and quartz sand (manufacturer Longchuan county TuoChengyuan quartz sand factory, manufacturer)
The filling height of the active carbon filter material is 800mm, the filling height of the hydroxyapatite filter material is 500mm, the filling height of the quartz sand is 400mm, and the filtering speed is 10m/h, so that raw water treated by the carbon sand is obtained;
step V: the raw water treated by the charcoal sand passes through a glass fiber filter membrane (Shenzhen Shanshun apparatus Co., Ltd., product name AT1504700) with the aperture of 0.1 μm and the operating pressure of 0.2MPa, so as to obtain the softened drinking water.
The filtration membrane was a pretreated glass fiber filtration membrane, and the same as in example 13 was prepared.
The starch-based coagulant was prepared as in example 16.
Test example 1
The concentration of the fluorine ions in the water body before and after the treatment of the softened drinking water treatment method in the embodiment of the invention is measured by adopting a fluorine ion selective electrode (PF-202-CF Leicii China), and the fluorine removal rate is calculated.
The specific test results are shown in table 3.
Table 3 fluorine removal test meter
It can be seen from table 1 that, after the hydroxyapatite filter material is added in the process of filtering the carbon sand, the fluorine content of the effluent is significantly reduced, which indicates that the hydroxyapatite with positive charges is easy to adsorb fluorine ions to be negatively charged, and thus the removal rate of the fluorine ions is improved. The hydroxyapatite filter material used in example 3 is prepared by modifying the surface of electronegative hydroxyapatite with dense electropositive aluminum hydroxide particles, and the positions of active action points are increased due to the electrostatic attraction effect, so that more fluorine ions are adsorbed and intercepted, and a higher defluorination effect is achieved. Similarly, in examples 14 to 19, the use of a starch-based coagulant in place of the polyaluminum chloride coagulant increased the adsorption of fluorine ions by electrostatic attraction. Example 16 in particular works best, indicating that the charge density and graft chain length have some compensatory effect. The drinking water softening treatment method can efficiently and stably remove the fluorine ions in the water, and does not cause any secondary pollution to the water body. The filter material used by the invention can adsorb and intercept the fluorine ions, thereby realizing the adsorption, filtration and removal of the fluorine ions.
Test example 2
COD in the water body before and after the treatment of the method for softening the drinking water in the embodiment of the inventionMn、TOC、NH4 +-N、NO3 --N、NO2 -The content of-N, Fe was measured and the removal rate was calculated.
The specific test results are shown in table 4.
TABLE 4CODMn、TOC、NH4 +-N、NO3 --N、NO2 --N, Fe test Table for removal Rate%
Test example 3
The turbidity in the water before and after the treatment of the softened drinking water treatment method in the embodiment of the invention is measured by using a scattering method-formalin standard. The specific test results are shown in table 5.
Table 5 turbidity removal test meter
One of the technical problems to be solved by the invention is that the turbidity of low-turbidity raw water is difficult to effectively remove. According to the invention, the quartz sand, the hydroxyapatite filter material and the active carbon filter material are paved in the filter column for filtering the carbon sand, so that the turbidity removal rate is improved. On the other hand, the amount of colloidal particles in the low-turbidity raw water is small, which is not favorable for coagulation, and the difficulty in removing turbidity is also an important reason for the difficulty in reducing turbidity. By using the starch coagulant with positive charges and the polyaluminium chloride in combination, the turbidity can be effectively removed, and soluble organic matters in a water body can be reduced. The coordination mechanism may be: the starch-based coagulant has the characteristics of higher charge density, high-molecular long-chain structure and uneven charge distribution, and can be preferentially combined and coagulated with substances with smaller particle sizes in water to form medium-scale primary flocs; the polyaluminium chloride is easy to be combined and coagulated with substances with larger particle sizes in water in a limited way due to lower charge density, small molecular weight and uniform charge distribution. Because the coagulation specificity of the two coagulants is different, in the combined use, the starch-based coagulant effectively removes particles with smaller particle size to form primary flocs with medium size, and the polyaluminium chloride further removes the primary flocs and particles with larger particle size, thereby achieving the purpose of synergistic enhanced flocculation.
It should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
Claims (5)
1. A method for treating softened drinking water, comprising the steps of:
step I: introducing raw water into a pre-ozone column, introducing 1.8-2.5 mg of ozone into each liter of raw water, allowing the raw water to stay for 2-5 minutes, and discharging water to obtain raw water subjected to pre-ozone treatment;
step II: introducing the raw water subjected to ozone pretreatment into a coagulation tank, adding 20-50 mg of a coagulant into each liter of raw water, stirring for 10-30 seconds at 200-300 revolutions per minute, stirring for 2-3 minutes at 100-150 revolutions per minute, stirring for 10-20 minutes at 30-50 revolutions per minute, standing and settling for 30-60 minutes, and discharging water to obtain the raw water subjected to coagulation treatment;
step III: introducing the coagulated raw water into a rear ozone column, introducing 1.8-2.5 mg of ozone into each liter of raw water, allowing the raw water to stay for 10-15 minutes, and discharging water to obtain the raw water subjected to rear ozone treatment; step IV: and (2) introducing the raw water subjected to the ozone treatment into a filter column filled with an activated carbon filter material, a hydroxyapatite filter material and quartz sand in sequence from an inlet to an outlet, wherein the filling height ratio of the activated carbon filter material to the hydroxyapatite filter material to the quartz sand is (1-2): (0.8-1.5): 1, the total filling height of the activated carbon filter material, the hydroxyapatite and the quartz sand accounts for 0.4-0.7 time of the height of the filter column, and the filtering speed is 10-30 m/h, so that raw water treated by the carbon sand is obtained;
step V: enabling raw water treated by the carbon sand to pass through a filtering membrane with the aperture of 0.1-0.4 mu m, and obtaining softened drinking water under the operation pressure of 0.1-0.3 MPa;
the coagulant is one or a mixture of polyaluminium chloride and a starch-based coagulant;
the preparation method of the starch-based coagulant comprises the following steps: weighing 2-10 g of starch, adding the starch into 100-300 mL of water, heating to 70-90 ℃, and stirring and pasting for 1-2 hours at 70-90 ℃; after pasting, introducing nitrogen, reducing the reaction temperature to 50-60 ℃, adding 4-10 g of an ammonium persulfate aqueous solution with the mass fraction of 2-5%, and reacting for 10-30 minutes to enable the initiator to fully react with the starch; adding a mixed monomer consisting of 0-25 g of acrylamide and 5-30 g of methacryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting at 50-60 ℃ for 3-4 hours after the addition is finished; after the reaction is finished, pouring the reaction product into 50-200 mL of acetone, fully stirring, standing for 30-60 minutes, and centrifuging to collect a bottom solid; and drying the bottom solid at 50-60 ℃, crushing and sieving to obtain the starch-based coagulant.
2. The method for treating softened drinking water as claimed in claim 1, wherein the activated carbon filter material is coal granular activated carbon or coal granular activated carbon modified by copolymerization of amide and carboxylic acid.
3. The method for treating softened drinking water as set forth in claim 2, wherein the amide and carboxylic acid co-modified coal granular activated carbon is prepared by the following method: washing the coal granular activated carbon with water, and then drying for 8-12 hours at 50-60 ℃ to obtain dried coal granular activated carbon; weighing 0.15-0.55 g of acrylic acid, 0.04-0.28 g of methacrylamide and 0.1-0.3 g N, dissolving N-methylene bisacrylamide in 20-50 mL of water, and performing ultrasonic treatment for 20-40 minutes to obtain a mixed solution; weighing 10-50 g of dry coal granular activated carbon, adding the dry coal granular activated carbon into the mixed solution, adding 80-200 mL of water, heating to 40-50 ℃ under the condition of mechanical stirring, and stirring and reacting for 20-30 minutes at 40-50 ℃; then adding 0.1-0.2 g of initiator potassium persulfate, heating to 60-70 ℃, and reacting at the constant temperature of 60-70 ℃ for 2-3 hours; after the reaction is finished, performing centrifugal separation, and collecting bottom sediment; washing the bottom precipitate with water, soaking the bottom precipitate in 50-100 mL of sodium hydroxide aqueous solution with the pH value of 9-10, standing for 30-60 minutes, filtering, and collecting a filter cake; washing the filter cake with deionized water until the pH value of the washing liquid reaches 7-8, and drying at 50-60 ℃ for 8-12 hours to obtain the amide and carboxylic acid copolymerization modified activated carbon.
4. The softened drinking water treatment method according to claim 1, characterized in that the filter membrane is a glass fiber filter membrane.
5. The softened drinking water treatment method according to claim 1, characterized in that the filtration membrane is a pretreated glass fiber filtration membrane, and is prepared by using the following method: firstly, soaking a glass fiber filtering membrane in 1-5 mol/L sodium hydroxide aqueous solution at 40-50 ℃ for 30-60 minutes, washing the glass fiber filtering membrane with water until the washing liquid is neutral, and drying to obtain the glass fiber filtering membrane treated by sodium hydroxide; secondly, soaking the glass fiber filtering membrane treated by sodium hydroxide in 1-5 mol/L acetic acid at 40-50 ℃ for 30-60 minutes, then washing the glass fiber filtering membrane by water until the washing liquor is neutral, and drying to obtain the acid-treated glass fiber filtering membrane; thirdly, mixing 2-5 g of silane coupling agent, 0.5-2 g of organosilicon quaternary ammonium salt, 70-80 mL of ethanol and 5-10 mL of water to prepare an antibacterial treatment solution, soaking the acid-treated glass fiber filter membrane in the antibacterial treatment solution for 5-10 minutes, taking out, and carrying out heat treatment at 110-120 ℃ for 100-150 minutes; and finally, washing the glass fiber filtering membrane after the heat treatment by using deionized water, and drying to obtain the pretreated glass fiber filtering membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010161304.1A CN111268823B (en) | 2020-03-10 | 2020-03-10 | Method for treating softened drinking water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010161304.1A CN111268823B (en) | 2020-03-10 | 2020-03-10 | Method for treating softened drinking water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111268823A CN111268823A (en) | 2020-06-12 |
| CN111268823B true CN111268823B (en) | 2022-01-18 |
Family
ID=70994411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010161304.1A Active CN111268823B (en) | 2020-03-10 | 2020-03-10 | Method for treating softened drinking water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111268823B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114853202A (en) * | 2022-03-30 | 2022-08-05 | 陕西尚远水务有限公司 | Reclaimed water softening process for steel mill |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101224928A (en) * | 2007-01-17 | 2008-07-23 | 东丽纤维研究所（中国）有限公司 | Water purification technology |
| CN102633409A (en) * | 2012-04-26 | 2012-08-15 | 复旦大学 | Technological method for controlling disinfection by-product and pathogenic microorganism risk of drinking water |
| CN102718357A (en) * | 2012-06-01 | 2012-10-10 | 上海穆特环保科技有限公司 | O3-BAC water treatment process and matched drinking water treatment device thereof |
| CN103566880A (en) * | 2013-09-29 | 2014-02-12 | 安徽金叶炭素科技有限公司 | Rice hull modified active carbon adsorption desulfurizing agent and preparation method thereof |
| CN107235609A (en) * | 2017-07-27 | 2017-10-10 | 冯婷婷 | A kind of deep treatment method of compound sewage |
-
2020
- 2020-03-10 CN CN202010161304.1A patent/CN111268823B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101224928A (en) * | 2007-01-17 | 2008-07-23 | 东丽纤维研究所（中国）有限公司 | Water purification technology |
| CN102633409A (en) * | 2012-04-26 | 2012-08-15 | 复旦大学 | Technological method for controlling disinfection by-product and pathogenic microorganism risk of drinking water |
| CN102718357A (en) * | 2012-06-01 | 2012-10-10 | 上海穆特环保科技有限公司 | O3-BAC water treatment process and matched drinking water treatment device thereof |
| CN103566880A (en) * | 2013-09-29 | 2014-02-12 | 安徽金叶炭素科技有限公司 | Rice hull modified active carbon adsorption desulfurizing agent and preparation method thereof |
| CN107235609A (en) * | 2017-07-27 | 2017-10-10 | 冯婷婷 | A kind of deep treatment method of compound sewage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111268823A (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111620473B (en) | Water treatment method | |
| CN109734145B (en) | Composite flocculant for treating printing and dyeing wastewater | |
| Lu et al. | Fabrication of cross-linked chitosan beads grafted by polyethylenimine for efficient adsorption of diclofenac sodium from water | |
| Rani et al. | Banana fiber Cellulose Nano Crystals grafted with butyl acrylate for heavy metal lead (II) removal | |
| JP6378342B2 (en) | Organic wastewater treatment method | |
| CN109734228B (en) | Composite sewage treatment method | |
| CN111268823B (en) | Method for treating softened drinking water | |
| Sun et al. | Effective sludge dewatering technique using the combination of Fenton's reagent and CPAM | |
| Zhou et al. | Efficient separation of water-soluble humic acid using (3-aminopropyl) triethoxysilane (APTES) for carbon resource recovery from wastewater | |
| Han et al. | Characterization and flocculation performance of a newly green flocculant derived from natural bagasse cellulose | |
| CN113307359B (en) | Composite carrier material for biological fluidized bed and preparation method thereof | |
| JP2004524967A (en) | Biochemical treatment of wastewater using nanomaterials | |
| CN109928475A (en) | A kind of composite water purifying agent and its preparation method and application | |
| CN108911373A (en) | A kind for the treatment of process of dyeing and printing sewage | |
| CN103253725A (en) | Method for removing organic matters in reclaimed water by using in situ FeOxHy | |
| Chen et al. | Synthesis and dewatering properties of cellulose derivative-grafting DMC amphoteric biodegradable flocculants | |
| JP3933230B2 (en) | Nitrogen-containing organic wastewater treatment method | |
| Bharti et al. | Synthesis, characterization and application of polymethyl methacrylate grafted oatmeal: A potential flocculant for wastewater treatment | |
| CN114853134A (en) | Composite polyaluminum ferric chloride water purifying agent and preparation method thereof | |
| JPH0827214A (en) | Production of hydrous gel, heavy metallic ion adsorbent, coloring matter adsorbent, microbial carrier and carrier for immobilizing enzyme | |
| CN113908812A (en) | Spherical hydrogel filler based on fly ash and preparation method thereof | |
| CN108773873A (en) | A kind of purifying agent for polluted water and preparation method thereof | |
| CN115057499B (en) | Urban sewage treatment agent and preparation method thereof | |
| CN110560013A (en) | Antibacterial glyoxalated polyacrylamide-lanthanum carbonate modified graphene phosphorus-chlorine adsorbent | |
| CN115259626B (en) | Sludge conditioner and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20211230 Address after: 524200 No.02 shop, 2 / F, building 4, Fuhua building, 75 Xihu wuheng Road, Xincheng street, Leizhou City, Zhanjiang City, Guangdong Province Applicant after: Leizhou Huayang Water Service Co.,Ltd. Address before: 432708 min Jia Yao, Jingtai village, Chenxiang Town, Guangshui City, Suizhou City, Hubei Province Applicant before: Min Guiqing |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |