CN102241430B - Method for removing bromine ions in drinking water by utilizing electrolytic cell - Google Patents
Method for removing bromine ions in drinking water by utilizing electrolytic cell Download PDFInfo
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- CN102241430B CN102241430B CN 201110127729 CN201110127729A CN102241430B CN 102241430 B CN102241430 B CN 102241430B CN 201110127729 CN201110127729 CN 201110127729 CN 201110127729 A CN201110127729 A CN 201110127729A CN 102241430 B CN102241430 B CN 102241430B
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- electrolyzer
- tap water
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- bromide anion
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Abstract
The invention relates to an electrolytic cell and a method for removing bromine ions in drinking water, and the electrolytic cell and method provided by the invention can be used for solving the technical problem of low removal rate in the existing method for removing bromate in drinking water. The inventive method comprises the following steps: adding deionized water into a cathode area 6 of the electrolytic cell while adding the drinking water to be treated into an anode area 5 of the electrolytic cell, wherein the bromate ion concentration of the drinking water to be treated is 1mg/L, and the pH value is adjusted to 7 by 0.1M HCl and NaOH; applying 8V of voltage through a power supply 7, controlling the current density at 10mA/cm<2> and the temperature of the electrolytic cell at 28 DEG C, and reacting for 600s, thus removing the bromine ions in the drinking water. The removal rate of the bromine ions is 82%-90% and the method is suitable for being used as a pretreatment technology for a water supply plant with higher content of bromine ions in source water.
Description
Technical field
The present invention relates to the method for bromide anion in electrolyzer and the removal tap water.
Background technology
Because the invasion of seawater and the discharging of man-made pollution source, make and usually contain a large amount of bromide anions in the water that according to the domestic and foreign literature report, the bromide ion concentration scope is at 0.008～6mg/L.Tap water itself exists bromide anion can not produce harm to human body, yet bromide anion can form bromate in the follow-up ozone high grade oxidation technology of water treatment, also might produce bromate in chlorination process.Bromate is classified as by international cancer research institution might be to human carcinogen's compound, the maximum bromate content 25 μ g/L of WHO suggestion tap water.The greatest contamination level (MCL) of EPA (USEPA) regulation present stage bromate is 10 μ g/L.New " drinking water sanitary standard " that China came into effect from July, 2007 stipulates first that also the bromate in the tap water must not surpass 10 μ g/L.The method of existing removal bromate has Fe (0) reduction, TiO
2The method that photo catalytic reduction, biological reducing, UV photodegradation and granulated active carbon (GAC) filter, but these methods are on the low side to bromate removal rate, are 50%～60% only, are difficult to satisfy the drinking water standard requirement.In a single day bromate generates common process and is difficult to remove, and solving the bromate problem at first is by reducing pH value, ammonification, adding excessive H
2O
2, and add a series of measures such as OH scavenging agent and control its generation.But not only actually operating difficulty of these methods, and because adding reagent is easy to generate secondary pollution.
Summary of the invention
The present invention will solve the low technical problem of bromate method clearance in the existing removal tap water, and provides a kind of electrolyzer to remove the method for bromide anion in the tap water.
A kind of electrolyzer of the present invention, comprise power supply, cell body, anode, negative electrode and ion-exchange membrane, make the negative electrode of electrolyzer with graphite, make the anode of electrolyzer with the carbon felt, ion-exchange membrane is divided into positive column and cathodic area with cell body, and negative electrode, power supply and anode are connected with titanium silk lead.
The method of utilizing electrolyzer to remove bromide anion in the tap water of the present invention is carried out according to the following steps: the cathodic area that, deionized water is added electrolyzer, simultaneously pending tap water is added the positive column of electrolyzer, the bromide ion concentration of pending tap water is 0.1mg/L～2mg/L; Two, apply the voltage of 5V～20V by external power, the control current density is 10mA/cm
2～15mA/cm
2, electrolyzer temperature is 23 ℃～28 ℃, reaction 20s～600s finishes the removal of bromide anion in the tap water.
Anolyte compartment and cathode compartment separate with ion-exchange membrane among the present invention, make negative electrode produce hydrogen and do not mix with the bromine simple substance that anode produces, and can collect utilization separately, and the titanium silk is made lead not only can be corrosion-resistant, but also have the effect of good conductivity.
The present invention utilizes electrochemical method, bromide anion is oxidized to bromine simple substance on anode electrolytic cell, the bromine simple substance that generates can be recovered utilization, do not generate simultaneously other by products at the removal bromide anion, removing the bromide anion in the water safely and efficiently, and then reduced the chance that potential ozonation by-product bromate generates in the subsequent technique, is a kind of innoxious technology, electrochemical method is to utilize electric energy to be converted into chemical energy, and electric current passes through and promote the method for chemical reaction in solution.With the traditional chemical method relatively, it has not only reduced the expense that chemical method adds a large amount of oxidations, reductibility medicament, can not introduce the secondary pollution that by product causes water simultaneously, is a kind of technology of green non-pollution.Electrolyzer uses the electrode materials cost low, works under the low current density condition, and energy consumption is low, and bromine oxide ionic reaction speed is fast, and current efficiency is 70%～90%, and the bromide anion clearance is 82%～90%; The hydrogen of Sheng Chenging can be recycled simultaneously, and technology is simple, and is low to the operational management requirement, is applicable to that the higher water supply plant of bromide anion content uses as pretreatment technology in the source water.
Description of drawings
Fig. 1 is the electrolyser construction synoptic diagram.
Embodiment
Embodiment one: a kind of electrolyzer of (please refer to accompanying drawing 1) present embodiment comprises power supply 7, cell body 1, anode 3, negative electrode 4 and ion-exchange membrane 2, make the anode 3 of electrolyzer with the carbon felt, make the negative electrode 4 of electrolyzer with graphite, ion-exchange membrane is divided into positive column 5 and cathodic area 6 with cell body, and anode 4, power supply 7 and negative electrode 4 usefulness titanium silk leads 8 are connected.
Anolyte compartment and cathode compartment separate with ion-exchange membrane in the present embodiment, make negative electrode produce hydrogen and do not mix with the bromine simple substance that anode produces, and can collect utilization separately, and the titanium silk is made lead not only can be corrosion-resistant, but also have the effect of good conductivity.Present embodiment is utilized electrochemical method, bromide anion is oxidized to bromine simple substance on anode electrolytic cell, the bromine simple substance that generates can be recovered utilization, do not generate simultaneously other by products at the removal bromide anion, removing the bromide anion in the water safely and efficiently, and then reduced the chance that potential ozonation by-product bromate generates in the subsequent technique, is a kind of innoxious technology, electrochemical method is to utilize electric energy to be converted into chemical energy, and electric current passes through and promote the method for chemical reaction in solution.With the traditional chemical method relatively, it has not only reduced the expense that chemical method adds a large amount of oxidations, reductibility medicament, can not introduce the secondary pollution that by product causes water simultaneously, is a kind of technology of green non-pollution.Electrolyzer uses the electrode materials cost low, works under the low current density condition, and energy consumption is low, and bromine oxide ionic reaction speed is fast, and current efficiency is 70%～90%, and the bromide anion clearance is 82%～90%; The hydrogen of Sheng Chenging can be recycled simultaneously, and technology is simple, and is low to the operational management requirement, is applicable to that the higher water supply plant of bromide anion content uses as pretreatment technology in the source water.
Embodiment two: the method for utilizing electrolyzer to remove bromide anion in the tap water of present embodiment is carried out according to the following steps: the cathodic area 6 that, deionized water is added electrolyzer, simultaneously pending tap water is added the positive column 5 of electrolyzer, the bromide ion concentration of pending tap water is 0.1mg/L～2mg/L; Two, apply the voltage of 5V～20V by external power, the control current density is 10mA/cm
2～15mA/cm
2, electrolyzer temperature is 23 ℃～28 ℃, reaction 20s～600s finishes the removal of bromide anion in the tap water.
Present embodiment is utilized electrochemical method to remove bromide anion in electrolyzer and is not generated other by products simultaneously, remove the bromide anion in the water safely and efficiently, and then reduced the chance that ozonation by-product bromate potential in the subsequent technique generates, it is a kind of innoxious technology, electrochemical method is to utilize electric energy to be converted into chemical energy, and electric current passes through and promote the method for chemical reaction in solution.With the traditional chemical method relatively, it has not only reduced the expense that chemical method adds a large amount of oxidations, reductibility medicament, can not introduce the secondary pollution that by product causes water simultaneously, is a kind of technology of green non-pollution.Electrolyzer uses the electrode materials cost low, works under the low current density condition, and energy consumption is low, and bromine oxide ionic reaction speed is fast, and current efficiency is 70%～90%, and the bromide anion clearance is 82%～90%; The hydrogen of Sheng Chenging can be recycled simultaneously, and technology is simple, and is low to the operational management requirement, is applicable to that the higher water supply plant of bromide anion content uses as pretreatment technology in the source water.
Embodiment three: present embodiment and embodiment two are different is that the bromide ion concentration of pending water in the step 1 is 0.3mg/L～1.8mg/L.Other is identical with embodiment two.
Embodiment four: present embodiment and embodiment two are different is that the bromide ion concentration of pending water in the step 1 is 1.0mg/L.Other is identical with embodiment two.
Embodiment five: what present embodiment was different with one of embodiment two to four is that voltage is 7V～18V in the step 2.Other is identical with one of embodiment two to four.
Embodiment six: what present embodiment was different with one of embodiment two to four is that voltage is 10V in the step 2.Other is identical with one of embodiment two to four.
Embodiment seven: what present embodiment was different with one of embodiment two to six is that current density is 11mA/cm in the step 2
2～14mA/cm
2Other is identical with one of embodiment two to six.
Embodiment eight: what present embodiment was different with one of embodiment two to six is that current density is 12mA/cm in the step 2
2Other is identical with one of embodiment two to six.
Embodiment nine: what present embodiment was different with one of embodiment two to eight is that electrolyzer temperature is 24 ℃～26 ℃ in the step 2.Other is identical with one of embodiment two to eight.
Embodiment ten: what present embodiment was different with one of embodiment two to eight is that electrolyzer temperature is 25 ℃ in the step 2.Other is identical with one of embodiment two to eight.
Embodiment 11: what present embodiment was different with one of embodiment two to ten is to react 50s～500s in the step 2.Other is identical with one of embodiment two to ten.
Embodiment 12: what present embodiment was different with one of embodiment two to ten is to react 200s in the step 2.Other is identical with one of embodiment two to ten.
Embodiment 13: the method for utilizing electrolyzer to remove bromide anion in the tap water of (with reference to the accompanying drawings 1) present embodiment is carried out according to the following steps: the cathodic area 6 that, deionized water is added electrolyzer, the positive column 5 that simultaneously pending tap water is added electrolyzer, the bromide ion concentration of pending tap water is 1mg/L, and to regulate the pH value with 0.1M HCl and NaOH be 7; Two, apply the voltage of 8V by power supply 7, the control current density is 10mA/cm
2, electrolyzer temperature is 28 ℃, reaction 120s finishes the removal of bromide anion in the tap water.
The electrolyzer of present embodiment comprises power supply 7, cell body 1, anode 3, negative electrode 4 and ion-exchange membrane 2, make the anode 3 of electrolyzer with the carbon felt, make the negative electrode 4 of electrolyzer with graphite, ion-exchange membrane is divided into positive column 5 and cathodic area 6 with cell body, and anode 4, power supply 7 and negative electrode 4 usefulness titanium silk leads 8 are connected; Anode 3 is 25cm with the contact area of pending tap water
2, negative electrode 4 is 25cm with the contact area of pending tap water
2, distance is 4cm between two electrodes, the useful volume in electrolytic cell anode district 5 and cathodic area 6 is 45cm
3
The present embodiment reaction finishes the back and detects bromide anion transformation efficiency 82%, current efficiency 78.5%, the pH value 2.3 of positive column, the pH value 9.8 in cathodic area.Present embodiment is utilized electrochemical method to remove bromide anion in electrolyzer and is not generated other by products simultaneously, remove the bromide anion in the water safely and efficiently, and then reduced the chance that ozonation by-product bromate potential in the subsequent technique generates, it is a kind of innoxious technology, electrochemical method is to utilize electric energy to be converted into chemical energy, and electric current passes through and promote the method for chemical reaction in solution.With the traditional chemical method relatively, it has not only reduced the expense that chemical method adds a large amount of oxidations, reductibility medicament, can not introduce the secondary pollution that by product causes water simultaneously, is a kind of technology of green non-pollution.Electrolyzer uses the electrode materials cost low, works under the low current density condition, and energy consumption is low; The hydrogen of Sheng Chenging can be recycled simultaneously, and technology is simple, requires low to operational management.
Embodiment 14: the method for utilizing electrolyzer to remove bromide anion in the tap water of (with reference to the accompanying drawings 1) present embodiment is carried out according to the following steps: the cathodic area 6 that, deionized water is added electrolyzer, the positive column 5 that simultaneously pending tap water is added electrolyzer, two, the cathodic area that deionized water is added electrolyzer, simultaneously pending tap water is added the positive column of electrolyzer, the bromide ion concentration of pending tap water is 1mg/L; Three, apply the voltage of 8V by power supply 7, the control current density is 10mA/cm
2, electrolyzer temperature is 28 ℃, reaction 120s finishes the removal of bromide anion in the tap water.
The electrolyzer of present embodiment is identical with the electrolyzer of embodiment 13.
The present embodiment reaction finishes the back and detects bromide anion transformation efficiency bromide anion transformation efficiency 85.5%, current efficiency 88%.Present embodiment is utilized electrochemical method to remove bromide anion in electrolyzer and is not generated other by products simultaneously, remove the bromide anion in the water safely and efficiently, and then reduced the chance that ozonation by-product bromate potential in the subsequent technique generates, it is a kind of innoxious technology, electrochemical method is to utilize electric energy to be converted into chemical energy, and electric current passes through and promote the method for chemical reaction in solution.With the traditional chemical method relatively, it has not only reduced the expense that chemical method adds a large amount of oxidations, reductibility medicament, can not introduce the secondary pollution that by product causes water simultaneously, is a kind of technology of green non-pollution.Electrolyzer uses the electrode materials cost low, works under the low current density condition, and energy consumption is low; The hydrogen of Sheng Chenging can be recycled simultaneously, and technology is simple, requires low to operational management.
Embodiment 15: the method for utilizing electrolyzer to remove bromide anion in the tap water of (with reference to the accompanying drawings 1) present embodiment is carried out according to the following steps: the cathodic area 6 that, deionized water is added electrolyzer, the positive column 5 that simultaneously pending tap water is added electrolyzer, two, the cathodic area that deionized water is added electrolyzer, simultaneously pending tap water is added the positive column of electrolyzer, the bromide ion concentration of pending tap water is 1mg/L; Three, apply the voltage of 8V by power supply 7, the control current density is 15mA/cm
2, electrolyzer temperature is 28 ℃, reaction 120s finishes the removal of bromide anion in the tap water.
The electrolyzer of present embodiment is identical with the electrolyzer of embodiment 13.
The present embodiment reaction finishes the back and detects bromide anion transformation efficiency 70.5%, current efficiency 81%.Present embodiment is utilized electrochemical method to remove bromide anion in electrolyzer and is not generated other by products simultaneously, remove the bromide anion in the water safely and efficiently, and then reduced the chance that ozonation by-product bromate potential in the subsequent technique generates, it is a kind of innoxious technology, electrochemical method is to utilize electric energy to be converted into chemical energy, and electric current passes through and promote the method for chemical reaction in solution.With the traditional chemical method relatively, it has not only reduced the expense that chemical method adds a large amount of oxidations, reductibility medicament, can not introduce the secondary pollution that by product causes water simultaneously, is a kind of technology of green non-pollution.Electrolyzer uses the electrode materials cost low, works under the low current density condition, and energy consumption is low; The hydrogen of Sheng Chenging can be recycled simultaneously, and technology is simple, requires low to operational management.
Embodiment 16: the method for utilizing electrolyzer to remove bromide anion in the tap water of (with reference to the accompanying drawings 1) present embodiment is carried out according to the following steps: one, the cathodic area 6 that deionized water is added electrolyzer, the positive column 5 that simultaneously pending tap water is added electrolyzer, two, the cathodic area that deionized water is added electrolyzer, the positive column that simultaneously pending tap water is added electrolyzer, the bromide ion concentration of pending tap water is 1mg/L, concentration by sodium-chlor is that 100mg/L adds sodium-chlor in pending tap water, and with phosphate buffer soln adjusting pH value, mix; Three, apply the voltage of 4V by power supply 7, the control current density is 15mA/cm
2, electrolyzer temperature is 28 ℃, reaction 120s finishes the removal of bromide anion in the tap water; The Na that wherein contains 11.55g/L in the phosphate buffer soln in the step 2
2HPO
412H
2O, the NaH of 2.77g/L
2PO
42H
2O, the NH of 0.31g/L
4The KCl of Cl and 0.13g/L.
The present embodiment reaction finishes the back and detects bromide anion transformation efficiency 89.4%, current efficiency current efficiency 90%.Present embodiment is utilized electrochemical method to remove bromide anion in electrolyzer and is not generated other by products simultaneously, remove the bromide anion in the water safely and efficiently, and then reduced the chance that ozonation by-product bromate potential in the subsequent technique generates, it is a kind of innoxious technology, electrochemical method is to utilize electric energy to be converted into chemical energy, and electric current passes through and promote the method for chemical reaction in solution.With the traditional chemical method relatively, it has not only reduced the expense that chemical method adds a large amount of oxidations, reductibility medicament, can not introduce the secondary pollution that by product causes water simultaneously, is a kind of technology of green non-pollution.Electrolyzer uses the electrode materials cost low, works under the low current density condition, and energy consumption is low; The hydrogen of Sheng Chenging can be recycled simultaneously, and technology is simple, requires low to operational management.
Claims (1)
1. an electrolyzer is removed the method for bromide anion in the tap water, it is characterized in that the method for utilizing electrolyzer to remove bromide anion in the tap water carries out according to the following steps:
One, the cathodic area (6) that deionized water is added electrolyzer adds pending tap water the positive column (5) of electrolyzer simultaneously, and the bromide ion concentration of pending tap water is 1mg/L, and is 7 with 0.1M HCl and NaOH adjusting pH value;
Two, apply the voltage of 8V by power supply (7), the control current density is 10mA/cm
2, electrolyzer temperature is 28 ℃, reaction 120s finishes the removal of bromide anion in the tap water;
Described electrolyzer comprises power supply (7), cell body (1), anode (3), negative electrode (4) and ion-exchange membrane (2), make the anode (3) of electrolyzer with the carbon felt, make the negative electrode (4) of electrolyzer with graphite, ion-exchange membrane is divided into positive column (5) and cathodic area (6) with cell body, and anode (4), power supply (7) and negative electrode (4) are connected with titanium silk lead (8); Anode (3) is 25cm with the contact area of pending tap water
2, negative electrode (4) is 25cm with the contact area of pending tap water
2, distance is 4cm between two electrodes, the useful volume of electrolytic cell anode district (5) and cathodic area (6) is 45cm
3
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|---|---|---|---|
| CN 201110127729 CN102241430B (en) | 2011-05-17 | 2011-05-17 | Method for removing bromine ions in drinking water by utilizing electrolytic cell |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279650A (en) * | 1997-03-31 | 2001-01-10 | 三菱电机株式会社 | Ultra-purity water producing apparatus by high temperature process and chemical liquid preparing system including the same |
| CN1353092A (en) * | 2000-11-02 | 2002-06-12 | 王衍洲 | Ion exchange process for cleaning water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003010853A (en) * | 2001-06-27 | 2003-01-14 | Ebara Jitsugyo Co Ltd | Electrochemical sterilizing method and apparatus therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279650A (en) * | 1997-03-31 | 2001-01-10 | 三菱电机株式会社 | Ultra-purity water producing apparatus by high temperature process and chemical liquid preparing system including the same |
| CN1353092A (en) * | 2000-11-02 | 2002-06-12 | 王衍洲 | Ion exchange process for cleaning water |
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| JP特开200310853A 2003.01.14 |
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