CN103922511A - Method for removing trace selenium in water - Google Patents
Method for removing trace selenium in water Download PDFInfo
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- CN103922511A CN103922511A CN201410186368.1A CN201410186368A CN103922511A CN 103922511 A CN103922511 A CN 103922511A CN 201410186368 A CN201410186368 A CN 201410186368A CN 103922511 A CN103922511 A CN 103922511A
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Abstract
The invention provides a method for removing trace selenium in water. The invention relates to a method for removing trace selenium in water. The method provided by the invention is used for solving the problems of an existing method for removing trace selenium in water that the treatment technology process is complicated, the operation cost is high and the selenium removal efficiency is low, and the problems of hard recovery and hard separation of an engineering nanomaterial after being used for removing heavy metals in water. The method includes the following steps: adding ferrate into water containing trace selenium, reacting, stirring to adsorb, and then adding a coagulant, and finally sequentially carrying out coagulation, sedimentation and filtration to remove the trace selenium in the water. The selenium removal efficiency of the method provided by the invention is higher than 90%, the technology process is simple, the operation cost is low, the selenium is effectively removed, drinking water meets the Hygienic Standard for Drinking Water, namely, the selenium is lower than 10 mu g/L. The invention is applied to a method for removing trace selenium in water.
Description
Technical field
The present invention relates to the removal method of trace selenium in water.
Background technology
Selenium is trace element important in ecotope, is also micro elements needed by human.The excessive meeting of Selenium in Environment causes animals and plants body to produce disease.In fact, for vertebrates, best selenium intake and can cause that the difference between the selenium intake of toxic effect is very little.Direct growing of damage to crops of the selenium of high density, reduces output, causes animal embryo anamorphosis even dead.
Toxicity based on selenium and environmental safety, many countries have all formulated strict environmental standard to it in the world, in China's " Drinking Water hygienic practice ", also strictly limit the maximum concentration of these harmful heavy metals in water, i.e. (selenium is 10 μ g/L).In recent years, the pollution of China's Heavy Metals in Water Environment selenium is day by day serious, directly causes the healthy of people to be endangered, and serious threat, to public health security, produces larger social influence.At present, in water body, the treatment technology of selenium mainly comprises biological process, the precipitator method, reverse osmosis, nanofiltration and absorption etc., but these methods or be difficult in deep purifying water body the selenium of trace, or running cost is high, is difficult to effective popularization.Nano material also becomes the brand-new material that in water, heavy metal is removed gradually, has very high specific surface area, can remove the heavy metal in water, and the cost of engineering nano material in water treatment is very high, and after there is use, difficulty reclaims and the difficult problem separating.Therefore, carry out emergency processing for the water source that is subject to heavy metal selenium contamination and seem particularly important, develop urgent technique efficient, cheap, easy to use extremely urgent.
Summary of the invention
The present invention will solve the removal method of trace selenium in existing water to exist treatment technology complex process, running cost high, and the removal efficiency of selenium is low, and adopt engineering nano material to remove the heavy metal in water, after there is use, difficulty reclaims and the difficult problem separating, and the removal method of trace selenium in a kind of water is provided.
A removal method for trace selenium in water, specifically carry out according to following steps:
One, to adding ferrate containing in the water of trace selenium, be then under 260r/min～350r/min at rotating speed, reaction 1min～5min, obtains mixing solutions; The dosage of described ferrate is 0.5mg/L～20mg/L;
Two, be under 150r/min～250r/min at rotating speed, the mixing solutions that step 1 obtains continues whip attachment 6min～11min, obtains the mixing solutions after absorption;
Three, to absorption after mixing solutions in dosing coagulant, then pass through successively coagulation, precipitation, filtration, can remove trace selenium in water; The dosage of described coagulating agent is 1mg/L～40mg/L.
The present invention utilizes ferrate strong oxidizing property oxidation tetravalence selenium, generates the hexavalent selenium of easily removing; Utilize ferrate reduction to generate ferric iron simultaneously and be hydrolyzed the nano-iron oxide generating as sorbent material, this sorbent material has the advantages that specific surface area is large, be easy to precipitate and separate, can active adsorption remove the selenium of lower concentration in water, can ensure that the selenium of lower concentration in drinking water source reaches the restriction of regulation in country's " drinking water sanitary standard ", i.e. 0.1 μ g/L in the time of water factory's water outlet.This technique has that removal efficiency is high, technique is simple, flexible and convenient operation, do not change the original treatment process of water factory and the advantage such as running cost is low, can be used for the emergency processing of water pollution incident.
The invention has the beneficial effects as follows: the present invention reaches more than 90% the removal efficiency of selenium, technical matters is simple, running cost is low; Realized effective removal of selenium, tap water reaches " drinking water sanitary standard ", and selenium is lower than 10 μ g/L.
The present invention is for a kind of removal method of water trace selenium.
Brief description of the drawings
Fig. 1 is the removal effect figure of trace selenium in embodiment mono-water.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the removal method of trace selenium in a kind of water described in present embodiment, specifically carry out according to following steps:
One, to adding ferrate containing in the water of trace selenium, be then under 260r/min～350r/min at rotating speed, reaction 1min～5min, obtains mixing solutions; The dosage of described ferrate is 0.5mg/L～20mg/L;
Two, be under 150r/min～250r/min at rotating speed, the mixing solutions that step 1 obtains continues whip attachment 6min～11min, obtains the mixing solutions after absorption;
Three, to absorption after mixing solutions in dosing coagulant, then pass through successively coagulation, precipitation, filtration, can remove trace selenium in water; The dosage of described coagulating agent is 1mg/L～40mg/L.
The ferrate adding in present embodiment step 1 is potassium ferrate or Na2Fe04.Present embodiment in the selection of ferrate, with not to introduce in source water in other tap water, limit, harmful assorted element is as the criterion.
In present embodiment step 3, utilize coagulation, precipitation, the filtration of conventional water treatment process.
Present embodiment is utilized ferrate strong oxidizing property oxidation tetravalence selenium, generates the hexavalent selenium of easily removing; Utilize ferrate reduction to generate ferric iron simultaneously and be hydrolyzed the nano-iron oxide generating as sorbent material, this sorbent material has the advantages that specific surface area is large, be easy to precipitate and separate, can active adsorption remove the selenium of lower concentration in water, can ensure that the selenium of lower concentration in drinking water source reaches the restriction of regulation in country's " drinking water sanitary standard ", i.e. 10 μ g/L in the time of water factory's water outlet.This technique has that removal efficiency is high, technique is simple, flexible and convenient operation, do not change the original treatment process of water factory and the advantage such as running cost is low, can be used for the emergency processing of water pollution incident.
The invention has the beneficial effects as follows: the present invention reaches more than 95% the removal efficiency of selenium, technical matters is simple, running cost is low; Realized effective removal of selenium, tap water reaches " drinking water sanitary standard ", and selenium is lower than 10 μ g/L.
The present invention is for a kind of removal method of water trace selenium.
Embodiment two: present embodiment is different from embodiment one: the dosage of the ferrate described in step 1 is 1mg/L～20mg/L.Other is identical with embodiment one.
Embodiment three: present embodiment is different from one of embodiment one or two: the dosage of the ferrate described in step 1 is 15mg/L.Other is identical with embodiment one or two.
Embodiment four: present embodiment is different from one of embodiment one to three: the ferrate described in step 1 is potassium ferrate or Na2Fe04.Other is identical with embodiment one to three.
Embodiment five: present embodiment is different from one of embodiment one to four: described in step 1 containing selenium in the water of trace selenium be the hexavalent selenium of tetravalence selenium, the dissociated ion state of dissociated ion state, by the tetravalence selenium of organism complexing, by the hexavalent selenium of organism complexing, by the tetravalence selenium of inorganics complexing or by a kind of in the hexavalent selenium of inorganics complexing or several mixture wherein.Other is identical with embodiment one to four.
Embodiment six: present embodiment is different from one of embodiment one to five:, to adding ferrate containing in the water of trace selenium, be then under 300r/min at rotating speed in step 1, reaction 3min, obtains mixing solutions.Other is identical with embodiment one to five.
Embodiment seven: present embodiment is different from one of embodiment one to six: be under 200r/min at rotating speed in step 2, the mixing solutions that step 1 obtains continues whip attachment 10min, obtains the mixing solutions after absorption.Other is identical with embodiment one to six.
Embodiment eight: the dosage of what present embodiment was different from one of embodiment one to seven the is coagulating agent described in step 3 is 5mg/L～35mg/L.Other is identical with embodiment one to seven.
Adopt following examples to verify beneficial effect of the present invention:
Embodiment mono-:
The removal method of trace selenium in a kind of water described in the present embodiment, specifically carry out according to following steps:
One, to adding ferrate containing in the selenous water of 100 μ g/L, be then under 300r/min at rotating speed, reaction 3min, obtains mixing solutions; The dosage of described ferrate is 10mg/L; Described ferrate is potassium ferrate;
Two, be under 200r/min at rotating speed, the mixing solutions that step 1 obtains continues whip attachment 10min, obtains the mixing solutions after absorption;
Three, to absorption after mixing solutions in dosing coagulant, then pass through successively coagulation, precipitation, filtration, can remove trace selenium in water; The dosage of described coagulating agent is 10mg/L; Described coagulating agent is Tai-Ace S 150.
The present embodiment is tested and is removed the content that remains selenium in rear water by plasma mass spectrograph, and by calculating the clearance of trace selenium in water outlet, in the present embodiment water, as shown in Figure 1, as seen from the figure, the present embodiment reaches more than 97% the removal efficiency of selenium the removal effect figure of trace selenium.
Embodiment bis-:
The removal method of trace selenium in a kind of water described in the present embodiment, specifically carry out according to following steps:
One, to adding ferrate containing in the selenic water of 100 μ g/L, be then under 300r/min at rotating speed, reaction 3min, obtains mixing solutions; The dosage of described ferrate is 10mg/L; Described ferrate is potassium ferrate;
Two, be under 200r/min at rotating speed, the mixing solutions that step 1 obtains continues whip attachment 10min, obtains the mixing solutions after absorption;
Three, to absorption after mixing solutions in dosing coagulant, then pass through successively coagulation, precipitation, filtration, can remove trace selenium in water; The dosage of described coagulating agent is 10mg/L; Described coagulating agent is Tai-Ace S 150.
The present embodiment reaches more than 96% the removal efficiency of selenium.
Embodiment tri-:
The removal method of trace selenium in a kind of water described in the present embodiment, specifically carry out according to following steps:
One, in the water containing 100 μ g/L tetravalence selenium and 5mg/L humic acids (in total organic carbon), adding ferrate, is then under 300r/min at rotating speed, and reaction 3min, obtains mixing solutions; The dosage of described ferrate is 10mg/L; Described ferrate is potassium ferrate;
Two, be under 200r/min at rotating speed, the mixing solutions that step 1 obtains continues whip attachment 10min, obtains the mixing solutions after absorption;
Three, to absorption after mixing solutions in dosing coagulant, then pass through successively coagulation, precipitation, filtration, can remove trace selenium in water; The dosage of described coagulating agent is 10mg/L; Described coagulating agent is Tai-Ace S 150.
The present embodiment aims to provide the impact that the organism using humic acids as representative is removed tetravalence selenium, and the present embodiment reaches more than 94% the removal efficiency of selenium.
Embodiment tetra-:
The removal method of trace selenium in a kind of water described in the present embodiment, specifically carry out according to following steps:
One, in the water containing 100 μ g/L hexavalent seleniums and 5mg/L humic acids (in total organic carbon), adding ferrate, is then under 300r/min at rotating speed, and reaction 3min, obtains mixing solutions; The dosage of described ferrate is 10mg/L; Described ferrate is potassium ferrate;
Two, be under 200r/min at rotating speed, the mixing solutions that step 1 obtains continues whip attachment 10min, obtains the mixing solutions after absorption;
Three, to absorption after mixing solutions in dosing coagulant, then pass through successively coagulation, precipitation, filtration, can remove trace selenium in water; The dosage of described coagulating agent is 10mg/L; Described coagulating agent is Tai-Ace S 150.
The present embodiment aims to provide the impact that the organism using humic acids as representative is removed hexavalent selenium, and the present embodiment reaches more than 96% the removal efficiency of selenium.
Claims (8)
1. a removal method for trace selenium in water, is characterized in that the removal method of trace selenium in a kind of water is carried out according to following steps:
One, to adding ferrate containing in the water of trace selenium, be then under 260r/min～350r/min at rotating speed, reaction 1min～5min, obtains mixing solutions; The dosage of described ferrate is 0.5mg/L～20mg/L;
Two, be under 150r/min～250r/min at rotating speed, the mixing solutions that step 1 obtains continues whip attachment 6min～11min, obtains the mixing solutions after absorption;
Three, to absorption after mixing solutions in dosing coagulant, then pass through successively coagulation, precipitation, filtration, can remove trace selenium in water; The dosage of described coagulating agent is 1mg/L～40mg/L.
2. the removal method of trace selenium in a kind of water according to claim 1, the dosage that it is characterized in that the ferrate described in step 1 is 1mg/L～20mg/L.
3. the removal method of trace selenium in a kind of water according to claim 1, the dosage that it is characterized in that the ferrate described in step 1 is 15mg/L.
4. the removal method of trace selenium in a kind of water according to claim 1, is characterized in that the ferrate described in step 1 is potassium ferrate or Na2Fe04.
5. the removal method of trace selenium in a kind of water according to claim 1, it is characterized in that described in step 1 containing selenium in the water of trace selenium be the hexavalent selenium of tetravalence selenium, the dissociated ion state of dissociated ion state, by the tetravalence selenium of organism complexing, by the hexavalent selenium of organism complexing, by the tetravalence selenium of inorganics complexing or by a kind of in the hexavalent selenium of inorganics complexing or several mixture wherein.
6. the removal method of trace selenium in a kind of water according to claim 1, is characterized in that adding ferrate to containing in the water of trace selenium in step 1, is then under 300r/min at rotating speed, and reaction 3min, obtains mixing solutions.
7. the removal method of trace selenium in a kind of water according to claim 1, is characterized in that in step 2 being under 200r/min at rotating speed, and the mixing solutions that step 1 obtains continues whip attachment 10min, obtains the mixing solutions after absorption.
8. the removal method of trace selenium in a kind of water according to claim 1, the dosage that it is characterized in that the coagulating agent described in step 3 is 5mg/L～35mg/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105000537A (en) * | 2015-06-29 | 2015-10-28 | 中南大学 | Method for separating selenium in alkaline leachate |
Citations (5)
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|---|---|---|---|---|
| CN1279652A (en) * | 1997-10-20 | 2001-01-10 | 德士古发展公司 | Process for removing selenium from refinery process water and wastewater streams |
| WO2007080686A1 (en) * | 2006-01-12 | 2007-07-19 | University Of Tsukuba | Process for the disposal of selenium-containing wastewater |
| US20120241381A1 (en) * | 2011-03-21 | 2012-09-27 | Bruso Bruce L | Method and apparatus for removal of selenium from water |
| CN102807272A (en) * | 2012-09-01 | 2012-12-05 | 同济大学 | Method for removing Se(IV)/Se(VI) from water by magnetic field enhanced zero-valent iron |
| CN103153879A (en) * | 2010-07-27 | 2013-06-12 | 泽农科技合股公司 | Selenium removal using chemical oxidation and biological reduction |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279652A (en) * | 1997-10-20 | 2001-01-10 | 德士古发展公司 | Process for removing selenium from refinery process water and wastewater streams |
| WO2007080686A1 (en) * | 2006-01-12 | 2007-07-19 | University Of Tsukuba | Process for the disposal of selenium-containing wastewater |
| CN103153879A (en) * | 2010-07-27 | 2013-06-12 | 泽农科技合股公司 | Selenium removal using chemical oxidation and biological reduction |
| US20120241381A1 (en) * | 2011-03-21 | 2012-09-27 | Bruso Bruce L | Method and apparatus for removal of selenium from water |
| CN102807272A (en) * | 2012-09-01 | 2012-12-05 | 同济大学 | Method for removing Se(IV)/Se(VI) from water by magnetic field enhanced zero-valent iron |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105000537A (en) * | 2015-06-29 | 2015-10-28 | 中南大学 | Method for separating selenium in alkaline leachate |
| CN105000537B (en) * | 2015-06-29 | 2017-07-14 | 中南大学 | A kind of method for separating selenium in alkaline leaching liquid |
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