CN114853202A - Reclaimed water softening process for steel mill - Google Patents
Reclaimed water softening process for steel mill Download PDFInfo
- Publication number
- CN114853202A CN114853202A CN202210331629.9A CN202210331629A CN114853202A CN 114853202 A CN114853202 A CN 114853202A CN 202210331629 A CN202210331629 A CN 202210331629A CN 114853202 A CN114853202 A CN 114853202A
- Authority
- CN
- China
- Prior art keywords
- water
- reclaimed water
- treatment
- antibacterial
- steel mill
- 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.)
- Pending
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
- C02F1/44—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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
- C02F5/145—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus combined with inorganic substances
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a process for softening reclaimed water in a steel mill, which is completed by the steps of pre-ozone treatment, coagulating sedimentation, antibacterial treatment and filter membrane filtration.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a water softening process in a steel mill.
Background
The steel industry is one of typical high-energy-consumption and high-water-consumption industries, and with the development of the society, the industry of the type faces huge difficulties, the living space of the industry is narrower, and the high water consumption of the steel enterprises is a huge obstacle to the development of the industry. In order to save water resources and adapt to the development of the times, steel production enterprises carry out advanced treatment on the produced sewage and then recycle the sewage, so that the use amount of fresh water is reduced, and the discharge of pollutants is reduced, namely, the consumption of water resources is reduced by adopting a mode of recycling reclaimed water.
The reclaimed water mainly refers to water which can be reused in a certain range and cannot be drunk after being treated, the quality of the reclaimed water is between that of feed water and drainage, and the reclaimed water is another form for effectively utilizing water resources.
Disclosure of Invention
The invention aims to provide a process for softening reclaimed water in a steel mill, which is used for solving the problems of high water consumption and substandard water treatment of iron and steel enterprises.
In order to achieve the purpose, the invention provides the following technical scheme: a process for softening reclaimed water in a steel mill is completed through the steps of pre-ozone treatment, coagulating sedimentation, antibacterial treatment and filter membrane filtration, and comprises the following specific steps:
(1) pre-ozone treatment: introducing reclaimed water into a pre-ozone column, introducing 1.2-1.6mg of ozone into each liter of raw water, allowing the raw water to stay for 6-8 minutes, and discharging the water to obtain reclaimed water subjected to pre-ozone treatment;
(2) coagulating sedimentation: introducing the reclaimed water subjected to the pre-ozone treatment into a coagulation tank, adding 25-35mg of coagulant into each liter of reclaimed water, performing primary stirring, secondary stirring and tertiary stirring, standing and settling for 60-80 minutes, and discharging water to obtain the reclaimed water subjected to the coagulation treatment;
(3) primary filtration: filtering the reclaimed water subjected to coagulation treatment for the first time through an antibacterial filter membrane;
(4) secondary filtration: and (4) performing secondary filtration on the water subjected to the primary filtration through a softening microporous filter membrane to finish the water softening process in the steel mill.
Further, the coagulant in the step (2) is one or a mixture of two or more of starch-based coagulant, polyaluminium chloride, aluminium sulfate, ferric chloride and polyacrylamide.
Further, the time of the first stirring in the step (2) is 12-18 seconds, the rotating speed is 320-420r/min, the time of the second stirring is 4-6 minutes, the rotating speed is 120-140r/min, and the time of the third stirring is 35-45 r/min.
Further, the antibacterial filter membrane in the step (3) is prepared by carrying out pretreatment, soaking and drying on a glass fiber filter membrane; the method comprises the following specific steps:
a. pretreatment: soaking the glass fiber filtering membrane in 2-4mol/L sodium hydroxide aqueous solution at 45-47 ℃ for 30-60 minutes, washing the glass fiber filtering membrane with water until the washing liquor is neutral, and drying to obtain the glass fiber filtering membrane treated by sodium hydroxide;
b. soaking, namely soaking the pretreated glass fiber filtering membrane in an antibacterial treatment solution for antibacterial treatment;
c. drying: and (4) carrying out heat treatment and drying on the glass fiber filtering membrane subjected to the antibacterial treatment, thus completing the preparation of the antibacterial filtering membrane.
Further, the antibacterial treatment solution in the step (b) is prepared by mixing a silane coupling agent, a quaternary ammonium organosilicon salt, ethanol, a UninedRM antibacterial agent and water, wherein the mixing ratio of the silane coupling agent, the quaternary ammonium organosilicon salt, the ethanol, the UninedRM antibacterial agent and the water is as follows: 0.2-0.3:1-2:2-6:0.5-1.5:60-90.
Further, the heat treatment temperature in the step (c) is 120-: 2-4 min.
Further, the softened microporous filtration membrane in the step (4) is mixed with a slow-release softener through a microporous filtration membrane, so that the slow-release softener is embedded in the microporous filtration membrane, and the pore size of the microporous filtration membrane is 0.25-0.35 micron.
Further, the slow-release softener comprises the following raw material formula components, by mass, 2-10 parts of sodium tripolyphosphate, 6-8 parts of sodium dihydrogen phosphate, 2-4 parts of sodium pyrophosphate, 12-14 parts of citric acid, 7-9 parts of dimethylethanolamine, 8-10 parts of calcium carbonate, 10-12 parts of monoethanolamine and 6-10 parts of rosin-based macroporous adsorption resin.
Furthermore, the particle size of the rosin-based macroporous adsorption resin is 0.4-0.8mm, and the pore size distribution is 30-50 nm.
By adopting the technical scheme, the invention has the beneficial effects that: the softening process has the advantages of low technical cost and high precipitation efficiency, can effectively remove micro particles and suspended matters in the raw water, effectively reduces the transparency, turbidity, organic pollutants and bacteria content of the water body, and has obvious treatment effect.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
Example 1
A process for softening water in a steel mill comprises the steps of pre-ozone treatment, coagulating sedimentation, antibacterial treatment and filter membrane filtration, and comprises the following specific steps:
(1) pre-ozone treatment: introducing reclaimed water into a pre-ozone column, introducing 1.2mg of ozone into each liter of raw water, keeping for 6 minutes, and discharging to obtain reclaimed water subjected to pre-ozone treatment;
(2) coagulating sedimentation: introducing the reclaimed water subjected to the pre-ozone treatment into a coagulation tank, adding 25mg of coagulant into each liter of reclaimed water, carrying out primary stirring, secondary stirring and tertiary stirring, standing and settling for 60 minutes, and discharging water to obtain the reclaimed water subjected to the coagulation treatment; the coagulant is one or the mixture of two or more of starch-based coagulant, polyaluminium chloride, aluminum sulfate, ferric chloride and polyacrylamide.
The time of primary stirring is 12 seconds, the rotating speed is 320r/min, the time of secondary stirring is 4 minutes, the rotating speed is 120r/min, and the time of tertiary stirring is 35 r/min.
(3) Primary filtration: filtering the reclaimed water subjected to coagulation treatment for the first time through an antibacterial filter membrane;
specifically, the antibacterial filter membrane is prepared by carrying out pretreatment, soaking and drying on a glass fiber filter membrane; the method comprises the following specific steps:
a. pretreatment: soaking the glass fiber filtering membrane in a 2mol/L sodium hydroxide aqueous solution at the temperature of 45 ℃ for 30 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;
b. soaking, namely soaking the pretreated glass fiber filtering membrane in an antibacterial treatment solution for antibacterial treatment;
c. drying: and (4) carrying out heat treatment and drying on the glass fiber filtering membrane subjected to the antibacterial treatment, thus completing the preparation of the antibacterial filtering membrane.
Specifically, the antibacterial treatment solution in the step (b) is prepared by mixing a silane coupling agent, a quaternary ammonium organosilicon salt, ethanol, a UninedRM antibacterial agent and water, wherein the mixing ratio of the silane coupling agent, the quaternary ammonium organosilicon salt, the ethanol, the UninedRM antibacterial agent and the water is as follows: 0.2:1:2:0.5:60.
Specifically, the heat treatment temperature in the step (c) is 120 ℃, and the heat treatment time is 2 min.
(4) Secondary filtration: and (4) performing secondary filtration on the water subjected to the primary filtration through a softening microporous filter membrane to finish the water softening process in the steel mill.
Specifically, the softened microporous filtration membrane in the step (4) is mixed with a slow-release softener through a microporous filtration membrane, so that the slow-release softener is embedded in the microporous filtration membrane, and the pore size of the microporous filtration membrane is 0.25 micron.
Specifically, the slow-release softener comprises the following raw material formula components, by mass, 2 parts of sodium tripolyphosphate, 6 parts of sodium dihydrogen phosphate, 2 parts of sodium pyrophosphate, 12 parts of citric acid, 7 parts of dimethylethanolamine, 8 parts of calcium carbonate, 10 parts of monoethanolamine and 6 parts of rosin-based macroporous adsorption resin.
Specifically, the particle size of the rosin-based macroporous adsorption resin is 0.4mm, and the pore size distribution is 30 nm.
Example 2
A process for softening reclaimed water in a steel mill is completed through the steps of pre-ozone treatment, coagulating sedimentation, antibacterial treatment and filter membrane filtration, and comprises the following specific steps:
(5) pre-ozone treatment: introducing reclaimed water into a pre-ozone column, introducing 1.6mg of ozone into each liter of raw water, keeping for 8 minutes, and discharging to obtain reclaimed water subjected to pre-ozone treatment;
(6) coagulating sedimentation: introducing the reclaimed water subjected to the pre-ozone treatment into a coagulation tank, adding 35mg of coagulant into each liter of reclaimed water, carrying out primary stirring, secondary stirring and tertiary stirring, standing and settling for 80 minutes, and discharging water to obtain the reclaimed water subjected to the coagulation treatment; the coagulant is one or the mixture of two or more of starch-based coagulant, polyaluminium chloride, aluminum sulfate, ferric chloride and polyacrylamide.
The time of the first stirring is 18 seconds, the rotating speed is 420r/min, the time of the second stirring is 6 minutes, the rotating speed is 140r/min, and the time of the third stirring is 45 r/min.
(7) Primary filtration: filtering the reclaimed water subjected to coagulation treatment for the first time through an antibacterial filter membrane;
specifically, the antibacterial filter membrane is prepared by carrying out pretreatment, soaking and drying on a glass fiber filter membrane; the method comprises the following specific steps:
d. pretreatment: soaking the glass fiber filtering membrane in 4mol/L sodium hydroxide aqueous solution at 47 ℃ for 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;
e. soaking, namely soaking the pretreated glass fiber filtering membrane in an antibacterial treatment solution for antibacterial treatment;
f. drying: and (4) carrying out heat treatment and drying on the glass fiber filtering membrane subjected to the antibacterial treatment, thus completing the preparation of the antibacterial filtering membrane.
Specifically, the antibacterial treatment solution in the step (e) is prepared by mixing a silane coupling agent, a quaternary ammonium organosilicon salt, ethanol, a UninedRM antibacterial agent and water, wherein the mixing ratio of the silane coupling agent, the quaternary ammonium organosilicon salt, the ethanol, the UninedRM antibacterial agent and the water is as follows: 0.3:2:6:1.5:90.
Specifically, the heat treatment temperature in the step (f) is 130 ℃, and the heat treatment time is as follows: and 4 min.
(8) Secondary filtration: and (4) performing secondary filtration on the water subjected to the primary filtration through a softening microporous filter membrane to finish the water softening process in the steel mill.
Specifically, the softened microporous filtration membrane in the step (8) is mixed with a slow-release softener through a microporous filtration membrane, so that the slow-release softener is embedded in the microporous filtration membrane, and the pore size of the microporous filtration membrane is 0.35 micron.
Specifically, the slow-release softener comprises the following raw material formula components, by mass, 10 parts of sodium tripolyphosphate, 8 parts of sodium dihydrogen phosphate, 4 parts of sodium pyrophosphate, 14 parts of citric acid, 9 parts of dimethylethanolamine, 10 parts of calcium carbonate, 12 parts of monoethanolamine and 10 parts of rosin-based macroporous adsorption resin.
Specifically, the particle size of the rosin-based macroporous adsorption resin is 0.8mm, and the pore size distribution is 50 nm.
Example 3
A process for softening reclaimed water in a steel mill is completed through the steps of pre-ozone treatment, coagulating sedimentation, antibacterial treatment and filter membrane filtration, and comprises the following specific steps:
(9) pre-ozone treatment: introducing reclaimed water into a pre-ozone column, introducing 1.4mg of ozone into each liter of raw water, keeping for 7 minutes, and discharging to obtain reclaimed water subjected to pre-ozone treatment;
(10) coagulating sedimentation: introducing the reclaimed water subjected to the pre-ozone treatment into a coagulation tank, adding 30mg of coagulant into each liter of reclaimed water, carrying out primary stirring, secondary stirring and tertiary stirring, standing and settling for 70 minutes, and discharging water to obtain the reclaimed water subjected to the coagulation treatment; the coagulant is one or the mixture of two or more of starch-based coagulant, polyaluminium chloride, aluminum sulfate, ferric chloride and polyacrylamide.
The time of the first stirring is 15 seconds, the rotating speed is 370r/min, the time of the second stirring is 5 minutes, the rotating speed is 130r/min, and the time of the third stirring is 40 r/min.
(11) Primary filtration: filtering the reclaimed water subjected to coagulation treatment for the first time through an antibacterial filter membrane;
specifically, the antibacterial filter membrane is prepared by carrying out pretreatment, soaking and drying on a glass fiber filter membrane; the method comprises the following specific steps:
g. pretreatment: soaking the glass fiber filtering membrane in 3mol/L sodium hydroxide aqueous solution at 46 ℃ for 45 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;
h. soaking, namely soaking the pretreated glass fiber filtering membrane in an antibacterial treatment solution for antibacterial treatment;
i. drying: and (4) carrying out heat treatment and drying on the glass fiber filtering membrane subjected to the antibacterial treatment, thus completing the preparation of the antibacterial filtering membrane.
Specifically, the antibacterial treatment solution in the step (h) is prepared by mixing a silane coupling agent, an organosilicon quaternary ammonium salt, ethanol, a UninedRM antibacterial agent and water, wherein the mixing ratio of the silane coupling agent, the organosilicon quaternary ammonium salt, the ethanol, the UninedRM antibacterial agent and the water is as follows: 0.25:1.5:4:1:75.
Specifically, the heat treatment temperature in the step (i) is 125 ℃, and the heat treatment time is as follows: 3 min.
(12) Secondary filtration: and (4) performing secondary filtration on the water subjected to the primary filtration through a softening microporous filter membrane to finish the water softening process in the steel mill.
Specifically, the softened microporous filtration membrane in the step (12) is mixed with a slow-release softener through a microporous filtration membrane, so that the slow-release softener is embedded in the microporous filtration membrane, and the pore size of the microporous filtration membrane is 0.3 micron.
Specifically, the slow-release softener comprises the following raw material formula components, by mass, 6 parts of sodium tripolyphosphate, 7 parts of sodium dihydrogen phosphate, 3 parts of sodium pyrophosphate, 13 parts of citric acid, 8 parts of dimethylethanolamine, 9 parts of calcium carbonate, 11 parts of monoethanolamine and 8 parts of rosin-based macroporous adsorption resin.
Specifically, the particle size of the rosin-based macroporous adsorption resin is 0.6mm, and the pore size distribution is 40 nm.
The starch-based coagulant has the characteristics of higher charge density, high-molecular long-chain structure and uneven charge distribution, can be preferentially combined and coagulated to form medium-scale primary flocs for substances with smaller particle sizes in water, and is easy to be combined and coagulated in a limited manner with substances with larger particle sizes in water due to lower charge density, small molecular weight and even charge distribution of polyaluminium chloride. Because the coagulation characteristics of the starch-based coagulant and the coagulant are 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. Meanwhile, the two can be used independently to achieve the effect of agglomeration.
Moreover, the softener in the application adopts a specific formula, the chemical softener performs chemical reaction on calcium and magnesium ions in water, the calcium and magnesium ions are precipitated and separated out, and the rosin-based macroporous adsorption resin in the application is combined to adsorb the calcium and magnesium ions in edema, so that the calcium and magnesium ions are better treated, the overall softening effect is good, and the softening recovery rate is high.
Simultaneously the antibiotic filter membrane in this application can effectively carry out antibiotic processing to the bacterium of centering aquatic, and antibiotic effect is good.
The following experimental data were obtained by taking the water softened in the present application in example 1, example 2 and example 3 and testing:
| example 1 | Example 2 | Example 3 | |
| pH value | 8.2 | 7.6 | 7.8 |
| Turbidity of water | ＜0.1 | ＜0.1 | ＜0.1 |
| Hardness of calcium | 200ppm | 180ppm | 160ppm |
| Antibacterial rate | ≥99％ | ≥97％ | ≥99％ |
From the experimental data, the water treated by the softening treatment method in the application is superior to the prior art in pH value, turbidity, calcium hardness and antibacterial rate, and the integral softening treatment method is simple and can realize industrialization.
Meanwhile, the COD removal rate of the treated reclaimed water is greatly improved by adopting a pre-ozone treatment method, and the removal rate can reach 70%.
The details which are not described in the specification belong to the prior art which is well known to those skilled in the art, the standard parts used in the present invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification, the specific connection mode of each part adopts the conventional means such as bolts, rivets, welding and the like which are mature in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, the circuit connection adopts the conventional connection mode in the prior art, and the details are not described herein, and the details which are not described in the specification belong to the prior art which is well known to those skilled in the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A process for softening reclaimed water in a steel mill is characterized by comprising the following steps: the water softening process in the steel mill is completed through the steps of pre-ozone treatment, coagulating sedimentation, antibacterial treatment and filter membrane filtration, and the specific steps are as follows:
(1) pre-ozone treatment: introducing reclaimed water into a pre-ozone column, introducing 1.2-1.6mg of ozone into each liter of raw water, allowing the raw water to stay for 6-8 minutes, and discharging the water to obtain reclaimed water subjected to pre-ozone treatment;
(2) coagulating sedimentation: introducing the reclaimed water subjected to the pre-ozone treatment into a coagulation tank, adding 25-35mg of coagulant into each liter of reclaimed water, performing primary stirring, secondary stirring and tertiary stirring, standing and settling for 60-80 minutes, and discharging water to obtain the reclaimed water subjected to the coagulation treatment;
(3) primary filtration: filtering the reclaimed water subjected to coagulation treatment for the first time through an antibacterial filter membrane;
(4) secondary filtration: and (4) performing secondary filtration on the water subjected to the primary filtration through a softening microporous filter membrane to finish the water softening process in the steel mill.
2. The steel mill reclaimed water softening process according to claim 1, characterized in that: the coagulant in the step (2) is one or a mixture of two or more of starch-based coagulant, polyaluminium chloride, aluminium sulfate, ferric chloride and polyacrylamide.
3. The steel mill reclaimed water softening process according to claim 1, characterized in that: the time of the first stirring in the step (2) is 12-18 seconds, the rotating speed is 320-420r/min, the time of the second stirring is 4-6 minutes, the rotating speed is 120-140r/min, and the time of the third stirring is 35-45 r/min.
4. The steel mill reclaimed water softening process according to claim 1, characterized in that: the antibacterial filter membrane in the step (3) is prepared by carrying out pretreatment, soaking and drying on a glass fiber filter membrane; the method comprises the following specific steps:
a. pretreatment: soaking the glass fiber filtering membrane in 2-4mol/L sodium hydroxide aqueous solution at 45-47 ℃ for 30-60 minutes, washing the glass fiber filtering membrane with water until the washing liquor is neutral, and drying to obtain the glass fiber filtering membrane treated by sodium hydroxide;
b. soaking, namely soaking the pretreated glass fiber filtering membrane in an antibacterial treatment solution for antibacterial treatment;
c. drying: and (4) carrying out heat treatment and drying on the glass fiber filtering membrane subjected to the antibacterial treatment, thus completing the preparation of the antibacterial filtering membrane.
5. The steel mill reclaimed water softening process according to claim 4, characterized in that: the antibacterial treatment solution in the step (b) is prepared by mixing a silane coupling agent, an organosilicon quaternary ammonium salt, ethanol, a Unined RM antibacterial agent and water, wherein the mixing ratio of the silane coupling agent, the organosilicon quaternary ammonium salt, the ethanol, the Unined RM antibacterial agent and the water is as follows: 0.2-0.3:1-2:2-6:0.5-1.5:60-90.
6. The steel mill reclaimed water softening process according to claim 4, characterized in that: the heat treatment temperature in the step (c) is 120-130 ℃, and the heat treatment time is as follows: 2-4 min.
7. The steel mill reclaimed water softening process according to claim 1, characterized in that: and (3) mixing the softened microporous filter membrane in the step (4) with a slow-release softener to enable the slow-release softener to be embedded in the microporous filter membrane, wherein the pore size of the microporous filter membrane is 0.25-0.35 micron.
8. The steel mill reclaimed water softening process according to claim 7, characterized in that: the slow-release softener comprises the following raw material formula components, by mass, 2-10 parts of sodium tripolyphosphate, 6-8 parts of sodium dihydrogen phosphate, 2-4 parts of sodium pyrophosphate, 12-14 parts of citric acid, 7-9 parts of dimethylethanolamine, 8-10 parts of calcium carbonate, 10-12 parts of monoethanolamine and 6-10 parts of rosin-based macroporous adsorption resin.
9. The steel mill reclaimed water softening process according to claim 8, characterized in that: the particle size of the rosin-based macroporous adsorption resin is 0.4-0.8mm, and the pore size distribution is 30-50 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210331629.9A CN114853202A (en) | 2022-03-30 | 2022-03-30 | Reclaimed water softening process for steel mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210331629.9A CN114853202A (en) | 2022-03-30 | 2022-03-30 | Reclaimed water softening process for steel mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114853202A true CN114853202A (en) | 2022-08-05 |
Family
ID=82628856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210331629.9A Pending CN114853202A (en) | 2022-03-30 | 2022-03-30 | Reclaimed water softening process for steel mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114853202A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005066403A (en) * | 2003-08-28 | 2005-03-17 | Teru Kagaku Kogyo Kk | Production method of filtration film for water treatment |
| CN101935106A (en) * | 2009-07-01 | 2011-01-05 | 新加坡美能材料科技有限公司 | Drinking water softener and softening method and equipment thereof |
| CN104891686A (en) * | 2015-06-24 | 2015-09-09 | 梁胜光 | Aqueous softener |
| CN111268823A (en) * | 2020-03-10 | 2020-06-12 | 闵桂青 | Method for treating softened drinking water |
| CN111620473A (en) * | 2020-06-10 | 2020-09-04 | 闵桂青 | Water treatment method |
-
2022
- 2022-03-30 CN CN202210331629.9A patent/CN114853202A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005066403A (en) * | 2003-08-28 | 2005-03-17 | Teru Kagaku Kogyo Kk | Production method of filtration film for water treatment |
| CN101935106A (en) * | 2009-07-01 | 2011-01-05 | 新加坡美能材料科技有限公司 | Drinking water softener and softening method and equipment thereof |
| CN104891686A (en) * | 2015-06-24 | 2015-09-09 | 梁胜光 | Aqueous softener |
| CN111268823A (en) * | 2020-03-10 | 2020-06-12 | 闵桂青 | Method for treating softened drinking water |
| CN111620473A (en) * | 2020-06-10 | 2020-09-04 | 闵桂青 | Water treatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112374705B (en) | High-salinity wastewater treatment process for iron and steel enterprises | |
| CN102276085B (en) | Recycling treatment method for discharge water of circulating water from power plant | |
| US20150076061A1 (en) | Coking wastewater treatment | |
| CN112794500B (en) | Coking wastewater strong brine near-zero emission treatment system and treatment method thereof | |
| US6287471B1 (en) | Treatment of aqueous effluents by injection of carbon dioxide | |
| CN107892339B (en) | Preparation and application of aquatic product sewage treatment agent | |
| CN114853202A (en) | Reclaimed water softening process for steel mill | |
| CN105776475A (en) | Compound polysilicate aluminum water purifying agent | |
| CN109437377B (en) | Preparation method of sewage treatment flocculant | |
| CN111620503A (en) | Treatment system and process for THPC-containing wastewater | |
| CN112479328A (en) | Preparation method of magnetic polyaluminum ferric silicate flocculant | |
| CN106006845B (en) | Method for improving flux of swine wastewater pretreated by ultrafiltration membrane method | |
| CN105236607A (en) | Silicon steel chromium-containing waste water processing system and processing method | |
| CN104445715A (en) | Treatment method for removing high-concentration nickel-containing electroplating wastewater | |
| CN112408662A (en) | Method for treating desulfurization wastewater of thermal power plant by virtue of single-multivalent separation electrodialysis | |
| CN104353408A (en) | Preparation method for modified porous SiO2 | |
| CN112939292B (en) | Method for treating industrial wastewater | |
| CN114212912B (en) | Hot galvanizing wastewater treatment method for metal products | |
| CN115594353B (en) | Treatment method of collophanite double reverse flotation wastewater | |
| CN216039149U (en) | Steel comprehensive wastewater resource utilization and salt separation and purification system | |
| CN211999263U (en) | Ammonium phosphate condensate complete treatment device | |
| CN111499055B (en) | Comprehensive treatment method of lithium rubber synthetic wastewater | |
| CN105439369B (en) | A kind of processing method of wastewater produced by synthetic rubber | |
| CN114853135B (en) | Treatment method of high-efficiency coagulation-assisting ultra-low turbidity water | |
| CN114345290B (en) | Method for purifying raffinate by utilizing shale vanadium extraction neutralization slag |
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 |