CN110023250A - For handling the processing system and processing method of the water containing silica - Google Patents
For handling the processing system and processing method of the water containing silica Download PDFInfo
- Publication number
- CN110023250A CN110023250A CN201780074970.8A CN201780074970A CN110023250A CN 110023250 A CN110023250 A CN 110023250A CN 201780074970 A CN201780074970 A CN 201780074970A CN 110023250 A CN110023250 A CN 110023250A
- Authority
- CN
- China
- Prior art keywords
- magnesium
- containing silica
- liquid
- value
- water
- 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.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/60—Silicon compounds
Abstract
This application provides a kind of water treatment system containing silica and methods, can effectively be handled water containing silica.Water treatment system containing silica 1 includes: magnesium dissolving tank 10, and wherein magnesium salts and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare containing magnesium liquid；With magnesium reactive tank 12, wherein by the way that the water containing silica and the mixing liquid being obtained by mixing containing magnesium liquid are reacted under conditions of pH value is 10-12.
Description
Technical field
The present invention relates to water treatment system containing silica and for handle water containing silica in it is silica containing
Method.
Background technique
The recycling and reuse of the water containing silica will cause in the duct, in reverse osmosis membrane (RO) device of follow-up phase
The problem of scale is formed in, this makes it difficult to improve the rate of recovery of the water containing silica, and is difficult to hold in some cases
The stable operation of row.Therefore, it is necessary to reduce the amount of the silica in water containing silica.
Quantifier elimination method for reducing the silica in water containing silica includes the method using magnesium salts.
For example, patent document 1 discloses a kind of method of amount for reducing silica, this method is included in containing silica
Magnesium salts is added in water, in the Mg (OH) of generation2Upper absorption silica, then be added molysite so that silica is flocculated, then into
Row is separated by solid-liquid separation, wherein being heated to 50 DEG C or higher temperature by will contain silica water in separation of solid and liquid reaches higher
Silica removal rate.However, will cause processing since the method for patent document 1 needs to use heat source for heating
The problem of increased costs.
The method for reducing the amount of silica is described in non-patent literature 1, this method comprises: into water containing silica
Mixture is added, wherein the mixture is obtained and adding sulfuric acid into the magnesium slurry containing MgO etc.；Separate solid at
Point, wherein compared to not into magnesium slurry, the case where addition sulfuric acid, the rate of recovery of silica is enhanced.But in non-patent
In the method for document 1, the silica of about 20mg/L is remained in processed water.When the risk for considering silicon dioxide dirt
When, in the case where follow-up phase provides reverse osmosis membrane apparatus, it is difficult to improve the rate of recovery of reverse osmosis membrane apparatus.
Reference listing
Patent document
Patent document 1:JP 2014-168742 A
Non-patent literature
Non-patent literature 1:Isabel Latour, Ruben Miranda, Angeles Blanco " uses slightly soluble magnesium chemical combination
Object removes silica first part ", separation and purification technique, 138 (2014), the 210-218 pages
Summary of the invention
At the water containing silica that can be effectively treated to water containing silica the object of the present invention is to provide one kind
Manage system and method.
According to the present invention, a kind of water treatment system containing silica is provided, comprising: magnesium dissolves unit, wherein magnesium salts and acid
It is mutually mixed and is reacted under conditions of pH value is less than or equal to 7 to prepare and contain magnesium liquid；With magnesium reaction member, wherein pass through by
Water containing silica and the mixing liquid being obtained by mixing containing magnesium liquid react under conditions of pH value is 10-12.
Water treatment system containing silica preferably includes: the magnesium dissolving tank of unit is dissolved as magnesium, wherein magnesium salts and sour phase
It mutually mixes and is reacted under conditions of pH value is less than or equal to 7 to prepare containing magnesium liquid；With the magnesium as magnesium reaction member
Reactive tank, wherein in pH value being 10-12 by the mixing liquid that will contain silica water and be obtained by mixing containing magnesium liquid
Under conditions of reacted.
Water treatment system containing silica preferably includes: as the magnesium dissolving tank of magnesium dissolution unit, wherein magnesium salts and acid exist
It mixing and is reacted under conditions of pH value is less than or equal to 7 to prepare comprising containing magnesium liquid and containing two in water containing silica
The mixing liquid of the mixture of silica water；With the magnesium reactive tank as magnesium reaction member, wherein mixing liquid is 10- in pH value
It is reacted under conditions of 12.
Water treatment system containing silica preferably includes removal unit, stage of the removal unit after magnesium reaction member
It is carried out reacting obtained insoluble matter by magnesium reaction member for separating and removing.
In water treatment system containing silica, removal unit is preferably included: flocculation unit is made by using flocculant
Insoluble matter flocculation；Solid-liquid separation unit, the stage being used for after flocculation unit are separated by solid-liquid separation flocculated substance.
In water treatment system containing silica, flocculant is preferably iron-based inorganic flocculating agent and cationic polymer flocculation
At least one of agent.
In addition, according to the present invention, a kind of method for treating water containing silica is provided comprising: magnesium course of dissolution, wherein magnesium
Salt and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare containing magnesium liquid；With magnesium reaction process,
Wherein through the mixing liquid that will contain silica water and be obtained by mixing containing magnesium liquid under conditions of pH value is 10-12
It is reacted.
In the magnesium course of dissolution of the method for treating water containing silica, magnesium salts and acid are preferably mutually mixed and are less than in pH value
Or equal to 7 under conditions of reacted to prepare containing magnesium liquid, and in magnesium reaction process, by will contain silica water and
Mixing liquid obtained from being mutually mixed containing magnesium liquid is preferably reacted under conditions of pH value is 10-12.
In the magnesium course of dissolution of the method for treating water containing silica, magnesium salts and acid are preferably mixed in water containing silica
And reacted under conditions of pH value is less than or equal to 7, it include the mixing containing magnesium liquid and the water containing silica with preparation
The mixing liquid of object, and in magnesium reaction process, mixing liquid is preferably reacted under conditions of pH value is 10-12.
Method for treating water containing silica separation and was removed by magnesium it is also preferable to include stage after magnesium reaction process
The removal process of insoluble matter obtained from the reaction carried out in reaction process.
In method for treating water containing silica, removal process is preferably included: using flocculant come the insoluble matter that flocculates
Flocculation process, and the separation of solid and liquid process that stage after flocculation is separated by solid-liquid separation flocculated substance.
In method for treating water containing silica, flocculant is preferably iron-based inorganic flocculating agent and cationic polymer flocculation
At least one of agent.
According to the present invention it is possible to effectively be handled water containing silica.
Detailed description of the invention
Fig. 1 is the schematic configuration for illustrating the example of the water treatment system according to an embodiment of the present invention containing silica
Figure.
Fig. 2 is the schematic structure for illustrating another example of the water treatment system according to an embodiment of the present invention containing silica
Make figure.
Fig. 3 is the schematic structure for illustrating another example of the water treatment system according to an embodiment of the present invention containing silica
Make figure.
Fig. 4 is dissolved for the silica concentration (mg/L) for the water crossed with settlement treatment that flocculates in illustrated example and relative to magnesium
The figure of the silica removal rate (%) of the pH value of slot.
Fig. 5 is the silica removal rate (%) for the additive amount (mg/L) relative to magnesium salts in illustrated example and comparative example
Figure.
Specific embodiment
It embodiments of the present invention will be described below.The present embodiment is realization example of the invention, and of the invention
It is not limited to the present embodiment.
In method for treating water containing silica according to an embodiment of the present invention and water treatment system containing silica, by magnesium
Salt and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare (magnesium course of dissolution) containing magnesium liquid,
Wherein water containing silica and the obtained mixing liquid being mutually mixed containing magnesium liquid carry out under conditions of pH value is 10-12
It reacts (magnesium reaction process).After magnesium reaction process, separation and removal are anti-by carrying out in magnesium reaction process as needed
Insoluble matter obtained from answering (removal process).
It will be detailed below being illustrated the example of processing system, which includes magnesium dissolving tank and magnesium reactive tank,
Middle magnesium dissolving tank is used to prepare containing magnesium liquid, and magnesium reactive tank is used for so that wherein water containing silica is with obtained containing magnesium liquid
The mixing liquid being mutually mixed is reacted.However, processing system is not limited to following configuration.It is taken as according to the present embodiment
The example of the processing system of the method for treating water containing silica, system example 1 (Fig. 1) and system example 2 (Fig. 2) itself and configuration will
It can be described below, wherein magnesium dissolving tank is obtained from water containing silica with via magnesium reactive tank in system example 1
The stream for obtaining processed water separates, via the magnesium dissolving tank and magnesium reactive tank being arranged in series and from containing dioxy in system example 2
Processed water is obtained in SiClx water.
[system example 1]
Water treatment system containing silica shown in FIG. 11 includes magnesium dissolving tank 10 and magnesium reactive tank 12, wherein in magnesium dissolving tank 10
Middle magnesium salts and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare containing magnesium liquid, magnesium reactive tank
12 for mixing liquid obtained from containing silica water and being mutually mixed containing magnesium liquid under conditions of pH value is 10-12 into
Row reaction.Water treatment system containing silica 1 is system example, wherein magnesium dissolving tank 10 with via magnesium reactive tank 12 from contain dioxy
The stream that processed water is obtained in SiClx water separates.
Water pipe containing silica 18 is connected to the water inlet containing silica of magnesium reactive tank 12, and the pipe 20 of processed water connects
It is connected to its processed water out.The outlet of magnesium dissolving tank 10 and the entrance containing magnesium liquid of magnesium reactive tank 12 pass through pipe containing magnesium liquid
26 link together.Agitating device 14 and 16 including stirring blade is mounted in magnesium dissolving tank 10 respectively as agitating unit
In magnesium reactive tank 12.Sour charge pipe 22 and magnesium salts charge pipe 24 are connected to magnesium dissolving tank 10.PH adjusting agent charge pipe 28 connects
To magnesium reactive tank 12.
Below by the behaviour to the method for treating water containing silica according to the present embodiment and water treatment system containing silica 1
It is described.
It is added an acid in magnesium dissolving tank 10 by sour charge pipe 22, for example, being added thereto by magnesium salts charge pipe 24
The water slurry of magnesium salts.They are stirred by agitating device 14, and by magnesium salts and acid under conditions of pH value is less than or equal to 7
It mixes and is reacted to prepare (magnesium course of dissolution) containing magnesium liquid.Solid magnesium salts can be added in magnesium dissolving tank 10 as former state
To be closed with acid-mixed.
On the other hand, it is anti-by water pipe containing silica 18 to be fed into magnesium for the water containing silica containing silica
Answer slot 12.In magnesium reactive tank 12, the magnesium liquid that contains containing magnesium salts and acid obtained in magnesium course of dissolution passes through containing magnesium liquid
Pipe 26 and be added into water containing silica, and stir and mix by agitating device 16.In addition, in magnesium reactive tank 12,
PH adjusting agent is added to by pH adjusting agent charge pipe 28 anti-containing being carried out in magnesium liquid and under conditions of pH value is 10-12
It answers, and silica does not dissolve (magnesium reaction process).Reaction liquid passes through the pipe of processed water as processed water
20 discharges.Alternatively, after magnesium reaction process such process can be carried out to the liquid after reaction, wherein by anti-in magnesium
Insoluble matter obtained from the reaction that should be carried out in the process separates and removes (removal as desired by removal unit (not shown)
Process).
In water treatment system containing silica 1, magnesium dissolving tank 10, agitating device 14 etc. are used as magnesium and dissolve unit, wherein
Magnesium salts and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare containing magnesium liquid, and magnesium reacts
Slot 12, agitating device 16 etc. are used as magnesium reaction member, for making wherein water containing silica and containing magnesium liquid in pH value 10-12
Under conditions of the mixing liquid that is mutually mixed reacted.
The inventors discovered that by forming acid and magnesium salts containing magnesium and reaction under conditions of pH value is less than or equal to 7
Liquid, and by by the resulting mixing liquid being mutually obtained by mixing containing magnesium liquid and water phase containing silica pH value be 10-
It is reacted under conditions of 12, may be implemented that water containing silica is effectively treated.The present inventors have additionally discovered that by anti-in magnesium
It answers the stage after slot 12 to separate and remove insoluble silica, the removal rate of silica can be significantly improved
(removal process).
Therefore, the stage after water treatment system containing silica 1 uses reverse osmosis membrane apparatus etc. to processed water
In the case where being recycled and being recycled, the processed water that silica is largely removed is obtained.Therefore, dioxy can be inhibited
The formation of SiClx dirt, and the rate of recovery can be improved.
[system example 2]
Water treatment system containing silica shown in Fig. 23 includes magnesium dissolving tank 30 and magnesium reactive tank 32, wherein is dissolved in magnesium
Magnesium salts and acid are mutually mixed in water containing silica and are reacted under conditions of pH value is less than or equal to 7 in slot 30, with
Prepare the mixing liquid being wherein mutually mixed containing magnesium liquid and water containing silica；Magnesium reactive tank 32 is then for being 10- in pH value
Under conditions of 12 mixing liquid is reacted.Water treatment system containing silica 3 is via the magnesium dissolving tank being arranged in series
30 and magnesium reactive tank 32 and the system example of processed water is obtained from water containing silica.
Water pipe containing silica 38 is connected to the water inlet containing silica of magnesium dissolving tank 30.The outlet of magnesium dissolving tank 30 and
The entrance of magnesium reactive tank 32 is linked together by pipe containing magnesium liquid 40.The pipe 42 of processed water is connected to magnesium reactive tank 32
Outlet.Agitating device 34 and 36 including stirring blade is mounted on magnesium dissolving tank 30 and magnesium reactive tank respectively as agitating unit
In 32.Sour charge pipe 44 and magnesium salts charge pipe 46 are connected to magnesium dissolving tank 30.PH adjusting agent charge pipe 48 is connected to magnesium reactive tank
32。
Below by the behaviour to the method for treating water containing silica according to the present embodiment and water treatment system containing silica 3
It is described.
Silica containing water containing silica is fed into magnesium dissolving tank 30 by water pipe containing silica 38.It is molten in magnesium
It solves in slot 30, is added an acid in water containing silica by sour charge pipe 44, and for example, pass through magnesium salts charge pipe 46 to its
Middle addition magnesium salts water slurry.By the stirring of agitating device 34, magnesium salts, acid and water containing silica are mutually mixed and are less than in pH value
Or equal to 7 under conditions of reacted, to prepare the mixing liquid (magnesium that is wherein mutually mixed containing magnesium liquid and water containing silica
Course of dissolution).Solid magnesium salts can be added in magnesium dissolving tank 10 to close with acid-mixed as former state.
Wherein being mutually mixed containing magnesium liquid and acid and water containing silica containing magnesium salts obtained in the magnesium course of dissolution
Obtained mixing liquid is fed into magnesium reactive tank 32 by pipe containing magnesium liquid 40, and is stirred by agitating device 36.Separately
Outside, in magnesium reactive tank 32, pH adjusting agent is added in mixing liquid by pH adjusting agent charge pipe 48, and is in pH value
It is reacted under conditions of 10-12, silica does not dissolve (magnesium reaction process).Reaction liquid passes through place as processed water
The pipe 42 for the water managed is discharged.Alternatively, such process can be carried out to the liquid after reaction after magnesium reaction process,
In the insoluble matter as obtained from the reaction carried out in magnesium reaction process as desired by removal unit (not shown) quilt
Separation and removal (removal process).
In water treatment system containing silica 3, magnesium dissolving tank 30, agitating device 34 etc. are used as magnesium and dissolve unit, wherein
Magnesium salts and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare containing magnesium liquid, also, magnesium reacts
Slot 32, agitating device 36 etc. are used as magnesium reaction member, for making wherein water containing silica and containing magnesium liquid in pH value 10-12
Under conditions of the mixing liquid that is mutually mixed reacted.
Using water treatment system containing silica shown in FIG. 11, since magnesium salts and acid are in magnesium dissolving tank 10
In mutually directly mix, therefore the time for dissolving magnesium salts can be shortened, and the volume of magnesium dissolving tank can be reduced.In addition, magnesium
Course of dissolution can be set as batch process.In addition, even if the silica concentration in water containing silica to be processed occurs
Variation, the influence to processing can also be reduced.
Water treatment system containing silica shown in Fig. 23 is effective in the case where water containing silica is acid
System.In addition, magnesium reactive tank 32 is flowed into the state coexisted due to the magnesium of silica and dissolution in water containing silica, because
The reactivity of this silica and magnesium can be higher, available than the higher silica removal rate of processing system 1.
The concentration of silica is such as 10mg/L to 500mg/L. in water containing silica to be processed
Water containing silica to be processed is not particularly limited, as long as it is the water containing silica, the example
Including the water containing silica generated by semiconductor fabrication factory and the water containing silica generated by power plant.
Magnesium salts is not particularly limited, as long as it is magnesium salts or its hydrate such as magnesia (MgO), magnesium hydroxide (Mg
(OH)2) or magnesium chloride (MgCl2·6H2O), but chemically cost etc. is set out, preferably magnesium hydroxide (Mg
(OH)2).As magnesium salts, can be used with chemical formula CaMg (CO3)2The magnesium-containing mineral of expression such as dolomite.In addition, from operability
Etc. set out, preferably by magnesium salts be used as solvent such as water slurry.
Acid is not particularly limited, and inorganic acid such as hydrochloric acid and sulfuric acid can be used.As acid, organic acid such as oxalic acid can be added
And citric acid.However, since with organic acid chelatropic reaction, the removal rate of silica may occur for the magnesium for depending on raw water
It may reduce.Therefore, it is necessary to careful.
For magnesium density, the additive amount of magnesium salts preferably in water containing silica the weight concentration of silica 0.1
To in the range of 10 times, more preferable 0.5 to 5 times.When the additive amount of magnesium salts is less than the weight of silica in water containing silica
At 0.1 times of concentration, the insoluble reaction of silica may be insufficient in some cases.When the additive amount of magnesium salts is greater than
When 10 times of the weight concentration of silica in water containing silica, sludge yield may become excessive in some cases
PH value in magnesium course of dissolution can be less than or equal to 7, and preferably in the range of 4 to 7, more preferably 4
To in the range of 6.When the pH value in magnesium course of dissolution is higher than 7, the dissolution of magnesium salts may be insufficient.When pH is lower than 4, by
It is hardly improved in silica removal rate, therefore acid injection cost may be wasted in some cases.But as reduction pH
When value, the reaction time of magnesium course of dissolution may be shortened.
Temperature in magnesium course of dissolution is not particularly limited, as long as magnesium can dissolve, such as it can be 1 DEG C or more
It is high and lower than 50 DEG C in the range of, and more preferably at 10 DEG C or higher and in the range of being lower than 50 DEG C.When in magnesium course of dissolution
Temperature be lower than 1 DEG C when, the dissolution of magnesium salts may be insufficient in some cases.When the temperature in magnesium course of dissolution is 50 DEG C
Or when higher, processing cost may be will increase in some cases.
Reaction time in magnesium course of dissolution is not particularly limited, as long as magnesium can dissolve, such as it can be 1 point
Clock is in the range of 60 minutes, and more preferably in the range of 5 minutes to 30 minutes.Reaction time in magnesium course of dissolution
At shorter than 1 minute, the dissolution of magnesium salts may be insufficient in some cases.It is longer than 60 when the reaction time in magnesium course of dissolution
When minute, reactive tank may become excessive in some cases.As described above, can by the pH value reduced in magnesium course of dissolution
To shorten the reaction time.
As pH adjusting agent, the alkali such as sodium hydroxide, calcium hydroxide can be used, hydrochloric acid, sulphur also can be used as needed
The inorganic acids such as acid.
PH value in magnesium reaction process can in the range of 10 to 12, and preferably in the range of 10.5 to 11.5,
More preferably in the range of 11 to 11.5.When the pH value in magnesium reaction process is lower than 10 or is higher than 12, silica removal speed
Rate reduces.
Temperature in magnesium reaction process is not particularly limited, as long as silica can carry out not dissolving instead at such a temperature
Should, such as it can be at 1 DEG C or higher and in the range of lower than 50 DEG C, and more preferably at 10 DEG C or higher and be lower than
In the range of 50 DEG C.When the temperature in magnesium reaction process is lower than 1 DEG C, the insoluble reaction of silica can in some cases
Energy can be insufficient.When the temperature in magnesium reaction process is 50 DEG C or higher, processing cost may be will increase in some cases.
Reaction time in magnesium reaction process is not particularly limited, as long as the insoluble reaction of silica can be
It can.For example, the reaction time is 1 minute to 60 minutes, more preferably 5 minutes to 30 minutes.When the reaction in magnesium reaction process
Between shorter than 1 minute when, the insoluble reaction of silica may be insufficient in some cases.When anti-in magnesium reaction process
When being longer than 60 minutes between seasonable, reactive tank may become excessive in some cases.
Method for separating and removing silica can be such as reducing silica method, such as: flocculating setting
Method, pressure floatation method, sand filtration method, membrane filtering method are (for example, use micropore filtering film (MF film), ultrafiltration membrane (UF film)
Deng film filtering), and from sludge yield etc., preferably flocculation sedimentation.
Stage after water treatment system containing silica 1 or 3 can separate and remove insoluble silica, so
Further progress reverse osmosis membrane (RO film) processing, carbonization treatment, ion-exchange treatment, distillation processing etc. afterwards.Containing silica
Stage after water treatment system 1 or 3 can be separated and be removed to silica with high removal rate.Therefore, even if rear
Phase carries out these processing to the processed water of gained, and the risk of fouling can also reduce.
[system example 3]
Fig. 3 shows the schematic configuration of the example of the water treatment system containing silica, wherein the stage after magnesium reactive tank
Insoluble silica is separated and removed by flocculation and sedimentation method.
Water treatment system containing silica shown in Fig. 35 is in the water process containing silica with structure shown in Fig. 2
The example that stage after the magnesium reactive tank 32 of system 3 carries out the construction in the case where flocculating setting processing.Contain shown in Fig. 3
Silica water treatment system 5 includes magnesium dissolving tank 30, magnesium reactive tank 32 and flocculation tank 50, flocculate as removal unit
Form slot 52 and precipitation tank 54, wherein in magnesium dissolving tank 30, magnesium salts and acid are mutually mixed in water containing silica, and
It is reacted under conditions of pH value is less than or equal to 7, is wherein mutually mixed containing magnesium liquid and water containing silica with preparation
Mixing liquid；Magnesium reactive tank 32 is for reacting mixing liquid under conditions of pH value 10-12.
Water pipe containing silica 38 is connected to the water inlet containing silica of magnesium dissolving tank 30.The outlet of magnesium dissolving tank 30 and
The entrance of magnesium reactive tank 32 is linked together by pipe containing magnesium liquid 40.The outlet of magnesium reactive tank 32 and the entrance of flocculation tank 50 are logical
Reaction liquid pipe 60 is crossed to link together.The entrance that the outlet of flocculation tank 50 and flocculate form slot 52 passes through flocculation liquid line 62
It links together.Flocculate forms the outlet of slot 52 and the entrance of precipitation tank 54 forms liquid line 64 by flocculate and is connected to one
It rises.The pipe 66 of processed water is connected to the processed water out of precipitation tank 54.Sludge pipe 68 is connected to the dirt of precipitation tank 54
Mud outlet.Agitating device 34,36,56 and 58 comprising stirring blade is mounted in magnesium dissolving tank 30 respectively as agitating unit,
In magnesium reactive tank 32, in flocculation tank 50 and in flocculate formation slot 52.Sour charge pipe 44 and magnesium salts charge pipe 46 are connected to magnesium
Dissolving tank 30.PH adjusting agent charge pipe 48 is connected to magnesium reactive tank 32.Inorganic flocculating agent charge pipe 70 is connected to flocculation tank 50.It is poly-
It closes object flocculant charge pipe 72 and is connected to flocculate formation slot 52.
Water containing silica containing silica is fed into magnesium dissolving tank 30 by water pipe containing silica 38.In magnesium
In dissolving tank 30, added an acid in water containing silica by sour charge pipe 44, and for example, by magnesium salts charge pipe 46 to
The water slurry of magnesium salts is wherein added.By the stirring of agitating device 34, magnesium salts, acid and water containing silica are mutually mixed and in pH value
It is reacted under conditions of less than or equal to 7, to prepare the mixed liquor being wherein mutually mixed containing magnesium liquid and water containing silica
Body (magnesium course of dissolution).Solid magnesium salts can be added in magnesium dissolving tank 10 to close with acid-mixed as former state.
Wherein being mutually mixed containing magnesium liquid and acid and water containing silica containing magnesium salts obtained in the magnesium course of dissolution
Mixing liquid, magnesium reactive tank 32 is fed by pipe containing magnesium liquid 40, and be stirred by agitating device 36.In addition,
In magnesium reactive tank 32, pH adjusting agent is added in mixing liquid by pH adjusting agent charge pipe 48, and is 10-12's in pH value
Under the conditions of reacted, silica does not dissolve (magnesium reaction process).Reaction liquid is supplied to flocculation by reaction liquid pipe 60
Slot 50.
In flocculation tank 50, inorganic flocculating agent is added in reaction liquid by inorganic flocculating agent charge pipe 70, and makes
Insoluble matter flocculates (flocculation process).Flocculated liquid is supplied to flocculate by the liquid line 62 that flocculates and forms slot 52.
It is formed in slot 52, is added to polymer flocculants by polymer flocculants charge pipe 72 flocculated in flocculate
In liquid, formed flocculate (flocculate forming process).Flocculate forms liquid and is supplied to by flocculate formation liquid line 64
Precipitation tank 54.
In precipitation tank 54, the aggregation that flocculate is formed is to be separated by solid-liquid separation (separation of solid and liquid process).Processed water
It is discharged by the pipe 66 of processed water.On the other hand, sludge is discharged by sludge pipe 68.
Stage after water treatment system containing silica 5 can be handled with further progress reverse osmosis membrane (RO film), is de-
Carbon processing, ion-exchange treatment, distillation processing etc..The processed water obtained in water treatment system containing silica 5 has
The silica removed with high removal rate.Therefore, even if the stage below carries out these processing, the risk of fouling can also drop
It is low.
The example of inorganic flocculating agent for flocculation process includes the inorganic wadding of iron-based inorganic flocculating agent such as iron chloride and aluminium base
Solidifying agent such as polyaluminium chloride (PAC), and chemically from the aspect of cost and flocculated pH range, preferably iron-based inorganic flocculation
Agent.
0.1 to 10 times of the amount for the magnesium salts that the additive amount of inorganic flocculating agent is preferably added with weight ratio meter, more preferably 1
To 5 times.When 0.1 times of the amount that the additive amount of inorganic flocculating agent is less than the magnesium salts being added with weight ratio meter, in some cases
Flocculation may be insufficient.When 10 times of the amount that the additive amount of inorganic flocculating agent is greater than the magnesium salts added with weight ratio meter,
Sludge yield may become excessive in some cases.
PH value in flocculation process is for example in the range of 3 to 11.When the pH in flocculation process is lower than 3 or is higher than 11,
Bad flocculation may occur in some cases.In addition, silica can be from wadding when the pH in flocculation process is lower than 9
It is dissolved in condensate.Therefore, it is intended that carrying out flocculation process in 9 to 11 pH value range.
Temperature in flocculation process is for example in the range of 1 DEG C to 80 DEG C.When the temperature in flocculation process is lower than 1 DEG C or high
When 80 DEG C, bad flocculation may occur in some cases.
Example for the polymer flocculants in flocculate forming process includes cationic polymer flocculent for example poly- third
Acrylamide or polyacrylate flocculant, Anionic polymer flocculants and Non-ionic polymer flocculants, and from wadding
From the aspect of solidifying property, preferably cationic polymer flocculent.
The example of commercially available polymer flocculants includes cationic polymer flocculent, such as ORFLOCK OX-304
(Organo Corporation manufacture).
Relative to the amount of raw water, the additive amount of polymer flocculants preferably in the range of 0.1 to 10mg/L, more preferably exists
In the range of 1 to 5mg/L.When the additive amount of polymer flocculants is less than 0.1mg/L relative to the amount of raw water, in certain situations
Lower flocculate formation will not improve.When the additive amount of polymer flocculants is greater than 10mg/L, pass through dissolution in some cases
In processed water and existing polymer flocculants may remain.
PH value in flocculate forming process is for example in the range of 3 to 11.When the pH value in flocculate forming process is low
In 3 or be higher than 11 when, bad flocculation may occur in some cases.In addition, when the pH value in flocculation process is lower than 9,
Silica can be dissolved from flocculate.It was formed therefore, it is desirable that carrying out flocculate in the range of pH value is 9 to 11
Journey.
Temperature in flocculate forming process is for example in the range of 1 DEG C to 80 DEG C.Temperature in flocculate forming process
Lower than 1 DEG C or when being higher than 80 DEG C bad flocculation may occur in some cases for degree.
In above-mentioned flocculation treatment, inorganic flocculating agent and polymer flocculants were formed for flocculation process and flocculate
Journey.Can be used at least one of inorganic flocculating agent, polymer flocculants etc., and it is preferable to use iron-based inorganic flocculating agent and
At least one of cationic polymer flocculent.When magnesium salts reacts so that insoluble silica flocculates, iron-based nothing is used
At least one of machine flocculant and cationic polymer flocculent can improve flocculating property and be separated by solid-liquid separation performance.
Other than sedimentation separation, the example of separation of solid and liquid further includes pressure floatation processing, film filtration treatment etc., and from
Separability etc. considers that sedimentation separation is preferred.
Example
The present invention is described more specifically below with reference to example and comparative example, but the present invention is not limited to following realities
Example.
<example 1 and comparative example 1>
Solid stream of water experiment is carried out to water containing silica by using processing system 5 shown in Fig. 3, while by magnesium dissolving tank
In pH value change into 4,5,6,7 (examples 1), 8,9,10 (comparative examples 1), and check removal silica effect.Test item
Part is as shown in table 1.
[table 1]
Table 1: experiment condition
Experimental result is as shown in Figure 4.Use spectrophotometer (U-3900, by Hitachi High-Tech Science
Corporation manufacture), silica concentration is measured by molybdenum Huang absorptiometry.
As shown in figure 4, finding when the pH value in magnesium dissolving tank is less than or equal to 7, the two of the processed water of flocculating setting
Silica concentration is successfully reduced.
<comparative example 2>
When changing additive amount (250mg/L, 500mg/L, 750mg/L, 1000mg/L and 1500mg/L) of magnesium salts, non-special
(magnesium salts: Mg (OH) under conditions of being recorded in sharp document 12+ sulfuric acid dissolves pH:9.5, reacts pH:11) use method of the invention
Experimental result be shown in FIG. 5.Wherein the pH value in magnesium dissolving tank be set as 7 example 1 (additive amount of magnesium salts:
230mg/L, 460mg/L and 920mg/L) result be also shown in FIG. 5.
As shown in figure 5, when being compared with the magnesium salts of identical additive amount, the result is that the silica of the method for example 1
Removal rate is higher than the silica removal rate of the method for comparative example 2 described in non-patent literature 1.
The above results show the processed water of available height removal silica.Therefore, even if in follow-up phase
Middle progress reverse osmosis membrane processing and treated that water is recycled and reused, can also reduce the risks such as silicon dioxide dirt.
As it appears from the above, the method by example 1 can effectively be handled water containing silica.
Reference signs list:
1,3,5: water treatment system containing silica
10,30: magnesium dissolving tank
12,32: magnesium reactive tank
14,16,34,36,56,58: agitating device
18,38: water pipe containing silica
20,42,66: the pipe of processed water
22,44: sour charge pipe
24,46: magnesium salts charge pipe
26,40: pipe containing magnesium liquid
28,48:pH regulator charge pipes
50: flocculation tank
52: flocculate forms slot
54: precipitation tank
60: reaction liquid pipe
62: flocculation liquid line
64: flocculate forms liquid line
68: sludge pipe
70: inorganic flocculating agent charge pipe
72: polymer flocculants charge pipe
Claims (12)
1. a kind of water treatment system containing silica, comprising:
Magnesium dissolves unit, and wherein magnesium salts and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare
Containing magnesium liquid；With
Magnesium reaction member, wherein by by the water containing silica and the mixed liquor being obtained by mixing containing magnesium liquid
Body is reacted under conditions of pH value is 10 to 12.
2. water treatment system containing silica according to claim 1, comprising:
Magnesium dissolving tank as magnesium dissolution unit, wherein the magnesium salts and the acid be mutually mixed and be less than in pH value or
Reacted described containing magnesium liquid to prepare under conditions of equal to 7；With
As the magnesium reactive tank of the magnesium reaction member, wherein by the way that the water containing silica and the magnesium liquid that contains are carried out
The mixing liquid being obtained by mixing is reacted under conditions of pH value is 10 to 12.
3. water treatment system containing silica according to claim 1, comprising:
As the magnesium dissolving tank of magnesium dissolution unit, wherein the magnesium salts and the acid mix in the water containing silica
And reacted under conditions of pH value is less than or equal to 7, it include described containing magnesium liquid and the water containing silica with preparation
Mixture mixing liquid；With
As the magnesium reactive tank of the magnesium reaction member, wherein the mixing liquid carries out anti-under conditions of pH value is 10 to 12
It answers.
4. water treatment system containing silica according to any one of claim 1 to 3, further includes:
Removal unit, the stage after the magnesium reaction member are used to separate and remove by magnesium reaction member progress
Insoluble matter obtained from reaction.
5. water treatment system containing silica according to claim 4, wherein
The removal unit includes:
Flocculation unit is used to that the insoluble matter to be made to flocculate by using flocculant；With
Solid-liquid separation unit, the stage being used for after the flocculation unit are separated by solid-liquid separation flocculated substance.
6. water treatment system containing silica according to claim 5, wherein
The flocculant is at least one of iron-based inorganic flocculating agent and cationic polymer flocculent.
7. a kind of method for treating water containing silica, comprising:
Magnesium course of dissolution, wherein magnesium salts and acid are mutually mixed and are reacted under conditions of pH value is less than or equal to 7 to prepare
Containing magnesium liquid；With
Magnesium reaction process, wherein by by the water containing silica and the mixed liquor being obtained by mixing containing magnesium liquid
Body is reacted under conditions of pH value is 10 to 12.
8. method for treating water containing silica according to claim 7, wherein
In the magnesium course of dissolution, the magnesium salts and the acid be mutually mixed and under conditions of pH value is less than or equal to 7 into
Row reaction is described containing magnesium liquid to prepare；With
In the magnesium reaction process, by by the water containing silica and the institute being obtained by mixing containing magnesium liquid
Mixing liquid is stated to be reacted under conditions of pH value is 10 to 12.
9. method for treating water containing silica according to claim 7, wherein
In the magnesium course of dissolution, the magnesium salts and the acid mix in water containing silica and are less than or equal in pH value
It is reacted under conditions of 7, to prepare the mixing liquid comprising the mixture containing magnesium liquid and the water containing silica；
With
In the magnesium reaction process, the mixing liquid is reacted under conditions of pH value is 10 to 12.
10. method for treating water containing silica according to any one of claims 7 to 9, further includes:
Removal process, the stage after the magnesium reaction process are used to separate and remove by magnesium reaction process progress
Insoluble matter obtained from reaction.
11. method for treating water containing silica according to claim 10, wherein
The removal process includes:
Flocculation process is used to that the insoluble matter to be made to flocculate by using flocculant；With
Separation of solid and liquid process, the stage being used for after the flocculation process are separated by solid-liquid separation flocculated substance.
12. method for treating water containing silica according to claim 11, wherein
The flocculant is at least one of iron-based inorganic flocculating agent and cationic polymer flocculent.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016239528A JP6912192B2 (en) | 2016-12-09 | 2016-12-09 | Silica-containing water treatment equipment and treatment method |
| JP2016-239528 | 2016-12-09 | ||
| PCT/JP2017/043922 WO2018105680A1 (en) | 2016-12-09 | 2017-12-07 | Treatment system and treatment method for silica-containing water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110023250A true CN110023250A (en) | 2019-07-16 |
| CN110023250B CN110023250B (en) | 2022-06-03 |
Family
ID=62492035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780074970.8A Active CN110023250B (en) | 2016-12-09 | 2017-12-07 | Treatment system and treatment method for treating water containing silicon dioxide |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6912192B2 (en) |
| CN (1) | CN110023250B (en) |
| TW (1) | TWI756294B (en) |
| WO (1) | WO2018105680A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7084704B2 (en) * | 2017-09-12 | 2022-06-15 | オルガノ株式会社 | Silica-containing water treatment equipment and treatment method |
| SG11202000889QA (en) * | 2017-09-12 | 2020-02-27 | Organo Corp | Apparatus and method for treating silica-containing water |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01133560A (en) * | 1987-11-17 | 1989-05-25 | Mitsubishi Electric Corp | Rotor for superconducting rotary electric machine and manufacture thereof |
| JPH01215390A (en) * | 1988-02-24 | 1989-08-29 | Sumitomo Metal Ind Ltd | Removal of silicon in waste pickling liquid for steel product |
| JPH0490888A (en) * | 1990-08-01 | 1992-03-24 | Tohoku Electric Power Co Inc | Treatment of fluoride-containing solution |
| JPH04367783A (en) * | 1991-06-14 | 1992-12-21 | Shin Nippon Kagaku Kogyo Co Ltd | Removing silica |
| JP2000254659A (en) * | 1999-03-12 | 2000-09-19 | Kurita Water Ind Ltd | Treatment of cmp waste liquid |
| CN1339409A (en) * | 2001-08-22 | 2002-03-13 | 盘锦市华意环境工程有限公司 | Condensed oil waste water deep treating and reusing technology |
| CN1412128A (en) * | 2002-11-07 | 2003-04-23 | 盘锦市华意环境工程有限公司 | Oil field visous crude sewage silicone-removing and cleaning process |
| CN1699210A (en) * | 2005-05-24 | 2005-11-23 | 辽河石油勘探局 | Process for removing silicon from thick oil sewage |
| CN102126764A (en) * | 2010-01-19 | 2011-07-20 | 栗田工业株式会社 | Etching waste water processing method of silicon wafer and processing device |
| CN102689956A (en) * | 2012-04-25 | 2012-09-26 | 浙江省海洋开发研究院 | Silicon removing method for silicone waste water |
| CA2809799A1 (en) * | 2012-03-16 | 2013-09-16 | Aquatech International Corporation | Process for purification of produced water |
| CN104185610A (en) * | 2011-04-12 | 2014-12-03 | 威立雅水务技术支持公司 | Method of recovering oil or gas and treating the resulting produced water |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5871648A (en) * | 1996-11-26 | 1999-02-16 | Environmental Chemistries, Inc. | Wastewater treatment process and apparatus for high flow impurity removal |
| JPH1133560A (en) * | 1997-07-15 | 1999-02-09 | Kurita Water Ind Ltd | Flocculation treatment of cmp waste solution |
| US20140145309A1 (en) * | 2012-11-26 | 2014-05-29 | Memc Singapore, Pte. Ltd (Uen200614797D) | Systems For The Recycling of Wire-Saw Cutting Fluid |
-
2016
- 2016-12-09 JP JP2016239528A patent/JP6912192B2/en active Active
-
2017
- 2017-11-14 TW TW106139254A patent/TWI756294B/en active
- 2017-12-07 CN CN201780074970.8A patent/CN110023250B/en active Active
- 2017-12-07 WO PCT/JP2017/043922 patent/WO2018105680A1/en active Application Filing
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01133560A (en) * | 1987-11-17 | 1989-05-25 | Mitsubishi Electric Corp | Rotor for superconducting rotary electric machine and manufacture thereof |
| JPH01215390A (en) * | 1988-02-24 | 1989-08-29 | Sumitomo Metal Ind Ltd | Removal of silicon in waste pickling liquid for steel product |
| JPH0490888A (en) * | 1990-08-01 | 1992-03-24 | Tohoku Electric Power Co Inc | Treatment of fluoride-containing solution |
| JPH04367783A (en) * | 1991-06-14 | 1992-12-21 | Shin Nippon Kagaku Kogyo Co Ltd | Removing silica |
| JP2000254659A (en) * | 1999-03-12 | 2000-09-19 | Kurita Water Ind Ltd | Treatment of cmp waste liquid |
| CN1339409A (en) * | 2001-08-22 | 2002-03-13 | 盘锦市华意环境工程有限公司 | Condensed oil waste water deep treating and reusing technology |
| CN1412128A (en) * | 2002-11-07 | 2003-04-23 | 盘锦市华意环境工程有限公司 | Oil field visous crude sewage silicone-removing and cleaning process |
| CN1699210A (en) * | 2005-05-24 | 2005-11-23 | 辽河石油勘探局 | Process for removing silicon from thick oil sewage |
| CN102126764A (en) * | 2010-01-19 | 2011-07-20 | 栗田工业株式会社 | Etching waste water processing method of silicon wafer and processing device |
| CN104185610A (en) * | 2011-04-12 | 2014-12-03 | 威立雅水务技术支持公司 | Method of recovering oil or gas and treating the resulting produced water |
| CA2809799A1 (en) * | 2012-03-16 | 2013-09-16 | Aquatech International Corporation | Process for purification of produced water |
| CN102689956A (en) * | 2012-04-25 | 2012-09-26 | 浙江省海洋开发研究院 | Silicon removing method for silicone waste water |
Non-Patent Citations (3)
| Title |
|---|
| LATOUR,ISABEL ET AL.: ""Silica removal with sparingly soluble magnesium compounds. Part I"", <SEPARATION AND PURIFICATION TECHNOLOGY> * |
| ZHU, PY ET AL.: ""Enhanced Removal of Metal Ions from Water by Novel Composite Magnesia-amended Silica Granules"", 《ADSORPTION SCIENCE & TECHNOLOGY》 * |
| 李冬梅: ""纳米SiO2在含阴离子表面活性剂低浊水处理中的应用"", 《环境工程学报》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI756294B (en) | 2022-03-01 |
| JP6912192B2 (en) | 2021-08-04 |
| TW201825409A (en) | 2018-07-16 |
| WO2018105680A1 (en) | 2018-06-14 |
| JP2018094482A (en) | 2018-06-21 |
| CN110023250B (en) | 2022-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4316393B2 (en) | Calcium fluoride manufacturing method, recycling method and recycling method | |
| TWI626990B (en) | Treatment method and treatment device for radioactive waste water | |
| Mulopo | Continuous pilot scale assessment of the alkaline barium calcium desalination process for acid mine drainage treatment | |
| JP4391429B2 (en) | Treatment and recycling method of fluorine-containing wastewater containing nitric acid and its recycling method | |
| WO2018092396A1 (en) | Treatment method and treatment apparatus for waste water containing sulfuric acid, fluorine and heavy metal ions | |
| JP2013075261A (en) | Treatment method and treatment apparatus that removes harmful substance | |
| JP2014233699A (en) | Method and apparatus for removing silica from treatment target water | |
| WO2015198438A1 (en) | Method and device for treating fluoride-containing water | |
| CN106396163B (en) | A kind of method of rare-earth smelting amine wastewater of sulphuric acid comprehensive treatment reuse | |
| CN110023250A (en) | For handling the processing system and processing method of the water containing silica | |
| CN104649494A (en) | Method for treating silica sol wastewater and co-producing sodium salt | |
| KR101990179B1 (en) | Method and apparatus for treating borofluoride-containing water | |
| JP2007185647A (en) | Method of treating silicon powder-containing drainage | |
| JP2007075780A (en) | Method and apparatus for treating manganese-containing water | |
| JP6467651B2 (en) | Method for producing aluminum compound solution | |
| JP2005296888A (en) | Immobilization method for fluorine, recycling method for calcium fluoride recovered by this method, and concentration regulation method for residual fluorine | |
| AU2019430430B2 (en) | Method and process arrangement for removing Si based compounds from a leaching liquor and use | |
| CN209872651U (en) | Treatment device for desulfurization wastewater quality-divided crystallization | |
| JP4347096B2 (en) | Fluorine removal apparatus and method for removing fluorine in waste water | |
| JPS59222292A (en) | Treatment of waste liquid of chemical cleaning containing ethylenediamine tetraacetate | |
| AU2016277790B2 (en) | Water softening treatment using in-situ ballasted flocculation system | |
| JP5896118B2 (en) | Method for producing calcium fluoride from wastewater containing fluorine | |
| JP4524796B2 (en) | Method and apparatus for treating fluorine-containing wastewater | |
| JP4246648B2 (en) | Method for producing zeolitic modified soil | |
| JP6660670B2 (en) | Method and apparatus for treating dithionic acid-containing water |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |