CN107973379A - Method suitable for in-situ remediation of arsenic pollution of anoxic underground water - Google Patents
Method suitable for in-situ remediation of arsenic pollution of anoxic underground water Download PDFInfo
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- CN107973379A CN107973379A CN201711348446.3A CN201711348446A CN107973379A CN 107973379 A CN107973379 A CN 107973379A CN 201711348446 A CN201711348446 A CN 201711348446A CN 107973379 A CN107973379 A CN 107973379A
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- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 42
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 24
- 238000005067 remediation Methods 0.000 title abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000005189 flocculation Methods 0.000 claims abstract description 31
- 230000016615 flocculation Effects 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000002161 passivation Methods 0.000 claims abstract description 8
- 230000035484 reaction time Effects 0.000 claims abstract description 8
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract 2
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 239000003673 groundwater Substances 0.000 claims description 25
- 238000011109 contamination Methods 0.000 claims description 17
- 230000026683 transduction Effects 0.000 claims description 16
- 238000010361 transduction Methods 0.000 claims description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- HTXDPTMKBJXEOW-UHFFFAOYSA-N iridium(IV) oxide Inorganic materials O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 238000003911 water pollution Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000002131 composite material Substances 0.000 claims 1
- 229910001447 ferric ion Inorganic materials 0.000 claims 1
- 229910001448 ferrous ion Inorganic materials 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000001988 toxicity Effects 0.000 abstract description 2
- 231100000419 toxicity Toxicity 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 201000009030 Carcinoma Diseases 0.000 description 1
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- HAYXDMNJJFVXCI-UHFFFAOYSA-N arsenic(5+) Chemical compound [As+5] HAYXDMNJJFVXCI-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 201000001531 bladder carcinoma Diseases 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 201000007270 liver cancer Diseases 0.000 description 1
- 208000014018 liver neoplasm Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000036647 reaction Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 208000010570 urinary bladder carcinoma Diseases 0.000 description 1
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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to a method suitable for in-situ remediation of arsenic pollution of anoxic underground water, in particular to a full-wave rectification alternating-current radio flocculation technology suitable for in-situ remediation of As (III) pollutants of anoxic underground water. The technology adopts inert materials as driving electrodes and iron-based materials as bipolar electrodes (BPEs), and solves the problem that the sacrificial electrode and a lead joint are easy to corrode in the long-time running process. And the passivation of the electrodes in the direct current flocculation system is relieved by adjusting the blank reaction time of the electrode reverse electrode gap. By regulating the current and ironThe number of the base BPEs realizes that Fe (II) generated in the system is O2The arsenic is oxidized into Fe (III) with stronger flocculation capacity, and simultaneously, As (III) is oxidized into As (V) which is easier to be fixed and removed and has less toxicity, thereby promoting the fixed removal of arsenic in underground water. The method is easy to regulate and control, simple to operate, economical, environment-friendly and good in application prospect.
Description
Technical field
It is more particularly to a kind of to be suitable for anoxic the present invention relates to a kind of technology to anoxic underground water heavy metal pollution reparation
The full-wave rectification of underground water As (III) pollution in-situ immobilizations exchanges wireless electric flocculation technique.
Background technology
In the world, underground water is the valuable source of most countries agricultural irrigation and domestic drinking water supply.But
It is that the mark discharge of crossing that work, agriculture, mining industry field include arsenic pollution thing has triggered serious arsenic pollution in body of groundwater.In underground water
In, arsenic mainly exists in the form of two kinds of inorganic ions of As (V) and As (III), its existence form difference causes arsenic ion in physics
Chemical characteristic, chemism and bio-toxicity etc. show greatest differences.For As (V), As (III) has more
Strong water body transfer ability and bio-toxicity.Underground water is once subject to the pollution of As (III), first water body environment is caused to endanger
Evil, causes biomass in water body to reduce or even become extinct, destroys the ecological balance；If the mankind have drunk contaminated water, can cause
The generation of the major diseases such as cutaneum carcinoma, lung cancer, carcinoma of urinary bladder and liver cancer, threatens health；If contaminated water
Not up to agricultural irrigation and industrial requirement can cause the underproduction.Therefore, develop and polluted available for underground water containing As (III)
The easy to operate, easy-regulating repaired with and it is particularly important that economic and environment-friendly technology.
In recent years, a kind of to do the electric flocculation technique of anode since its is easy to operate based on iron, solid waste yield is few and suitable
It is widely used in the processing containing As (III) polluted underground water the advantages that wide with scope.In this process, iron anode is in low-pressure direct
Through sustainable generation Fe (II) ion of cell reaction under the action of galvanic electricity, the coupling process of the reaction and aeration system, can make production
Raw Fe (II) ions are oxidized to Fe (III) ion in anoxic groundwater environment, these iron ions are anti-through a series of chemistry
The hydroxide that should change into has stronger adsorption capacity to arsenic removes arsenic pollution thing from underground water.Although the technology can be into
Work(removes the arsenic pollution thing in underground water, but the O during this2Mainly enter underground water in the form of compressed air, may
The pollutant (PM 2.5, formaldehyde and virus etc.) in air is incorporated into underground water, cause secondary pollution.In traditional electric flocculation mistake
Cheng Zhong, sacrificial electrode are connected by conducting wire with external power supply, can be subject to the corruption of higher in the contact interface of sacrificial electrode and conducting wire
Lose stress so that sacrificial electrode is more perishable in joint with conducting wire, is grasped so as to add the technology in During Process of Long-term Operation
The complexity of work and later period maintenance.In addition, under the conditions of DC electrolysis, traditional electric flocculation technique sacrificial anode during the reaction
Passivation phenomenon occurs, hinders the transfer of effective current on electrode, causes being lower for efficiency in longtime running to produce higher
Energy consumption and higher operating cost.
The content of the invention
The technical problem to be solved in the present invention is traditional electric flocculation technique, passivation occurs in sacrificial anode during the reaction
Phenomenon, hinders the transfer of effective current on electrode, cause in longtime running efficiency be lower produce higher energy consumption and compared with
High operating cost.
To solve the above problems, the present invention provides one kind to be used for As (III) pollutant in-situ immobilization in anoxic underground water
Full-wave rectification exchange wireless electric flocculation technique.Direct current is converted to full-wave rectification alternating current by the technology using specific instrument
To realize the periodical exchange of polarity of electrode, using iron-based material as bipolar electrode (BPEs), inert material as driving
Electrode is in situ into polluted underground water respectively to provide Fe (II) and O2, realize the oxidation of hypertoxicity As (III) in underground water and consolidate
Fixed removing.
Specifically technical solution is：
A kind of method suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, is made respectively using iron-based material and inert material
For bipolar electrode (BPEs) and driving electrodes, the two can produce O respectively when inputting full-wave rectification alternating current2With Fe (II),
This procedure avoids sacrificial electrode directly by the connection of conducting wire and external power supply, solve sacrificial electrode and be in terminal
The problem of perishable during long-play.Direct current is converted into full-wave rectification alternating current using particular instrument and realizes electrode
The periodical exchange of polarity, the blank reaction time (T of clearance between poles is fallen by adjusting electrodeBlank) alleviate direct current flocculation system
The problem of interior electrode passivation.Realize the Fe produced in system (II) by oxygen by adjusting the size of electric current and the number of iron-based BPEs
The stronger Fe of flocculation ability (III) is melted into, As (III) is oxidized to and is easier to fixed removing and the less As of toxicity (V), and then
Promote the fixed removing of arsenic from underwater.
Realized using following equipment：One kind is suitable for anoxic Arsenic Contamination in Groundwater in-situ repairing device, including power supply, conversion
Instrument, driving electrodes, bipolar electrode, water pump, power supply are connected with transduction equipment, and transduction equipment is whole for all-wave by DC conversion
Alternating current is flowed, transduction equipment connects two driving electrodes, bipolar electrode is equipped between driving electrodes respectively；Above device is installed
In underground water pollution pinnule downstream, a permeable conversion zone is set up in water-bearing layer, by driving electrodes and bipolar electrode
Permeable conversion zone is introduced, contaminated underground water is extracted out after the purification of permeable conversion zone through water pump.
Wherein, preferred solution is as follows：
Iron-based material and inert material is respectively adopted in the bipolar electrode (BPEs) and driving electrodes.Active metal material
Matter can be iron, stainless steel etc..Inert material can select titanium-based IrO2/Ta2O5 combination electrodes, graphite or metal platinum etc.；
The instrument of the offer low-voltage DC is DC power supply, solar panels etc.；
Described is that the specific apparatus of alternating current is the time relay, component pulse-changing power etc. by DC conversion；Used time
Between relay control two contactors, a contactor connects anode and then to load, and one connects battery cathode and then to negative
Carry, the height of frequency can be adjusted by the time relay, by converting direct-current power into alternating-current power.
The current range of the low-voltage DC is 5mA~100mA；
Described BPEs number N >=1 of iron-based；
The electrode falls blank reaction time T blank >=6.0s of clearance between poles.
Compared with prior art, advantage for present invention is：
(1) present invention using iron-based material as bipolar electrode (BPEs), inert material as driving electrodes respectively to
It is in situ in polluted underground water that Fe (II) and O is provided2, avoid traditional electric flocculation and secondary pollution caused by aeration coupling technique
Problem, and improve O2Utilization rate.
(2) present invention using iron-based material be used as bipolar electrode (BPEs), avoid sacrificial electrode by conducting wire with outside
The connection of portion's power supply, and then solve the problems, such as that sacrificial electrode is perishable in connector with conducting wire.
(3) present invention for alternating current by DC conversion by realizing the periodical exchange of polarity of electrode, so as to alleviate
Electric flocculation technique is in DC electrolysis system the problem of electrode passivation.
(4) present invention can be by adjusting regulation and control of the bipolar electrode number realization to Fe flocculant yield.
(5) chemical reagent additive amount used in the present invention is few, is precipitated in reaction process, sludge yield is low, power consumption
It is small, used easy to large-scale promotion.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described.
Fig. 1 is that (arrow is current to field application device concept model of the present invention reparation containing As (III) polluted underground water
To)；
Fig. 2 is the present invention and direct current electric flocculation under anaerobic to the comparison diagram of total arsenic removal effect in solution；
Fig. 3 is influence of the different electric currents to total arsenic concentration change in solution；
Fig. 4 is different iron-based BPE several influences to total arsenic concentration change in solution；
Fig. 5 is the wireless electric flocculation technique of direct current and the electrode difference of falling clearance between poles blank reaction time of the present invention to total in solution
The comparison diagram of arsenic removal effect.
1, power supply in figure；2nd, transduction equipment；3rd, permeable conversion zone；4th, driving electrodes；5th, bipolar electrode；6th, water
Pump.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without making creative work, belong to the scope of protection of the invention.
A kind of method suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, is made respectively using iron-based material and inert material
For bipolar electrode (BPEs) and driving electrodes, connection of the sacrificial electrode by conducting wire and external power supply is avoided, solves sacrifice
Electrode and terminal are in the problem of perishable during long-play.Direct current is converted into all-wave using particular instrument
Rectification alternating current realizes the periodical exchange of polarity of electrode, and the blank reaction time (T of clearance between poles is fallen by adjusting electrodeBlank) come
The problem of alleviating electrode passivation in direct current flocculation system.System is realized by adjusting the size of electric current and the number of iron-based BPEs
The Fe (II) of interior generation is oxidized to the stronger Fe of flocculation ability (III), and As (III) is oxidized to and is easier to fixed removing and poison
Property less As (V), and then promote the fixed removing of arsenic from underwater.
Realized using following equipment：One kind is suitable for anoxic Arsenic Contamination in Groundwater in-situ repairing device, including power supply 1, turn
Instrument 2, driving electrodes 4, bipolar electrode 5, water pump 6 are changed, power supply 1 is connected with transduction equipment 2, passes through DC power supply or solar energy
Electrode plate provides direct current；Transduction equipment 2 is the time relay or component pulse-changing power, and DC conversion is handed over for full-wave rectification
Galvanic electricity, realizes the conversion of polarity of electrode, and electrode falls the blank reaction time T of clearance between polesBlank≥6.0s；Transduction equipment 2 connects respectively
Two driving electrodes 4, using titanium-based IrO2/Ta2O5Combination electrode；Bipolar electrode 5 is equipped between driving electrodes 4, for iron or not
Become rusty steel, number N >=1；Above device is installed on underground water pollution pinnule downstream, and a permeable reaction zone is set up in water-bearing layer
Domain 3, can be well, and driving electrodes 4 and bipolar electrode 5 are introduced permeable conversion zone 3, the underground polluted by As (III)
Water is extracted out after the purification of permeable conversion zone through water pump 6.Above-mentioned technical problem is not repeated to describe in following case study on implementation.
Embodiment 1：
In simulated groundwater environment, wireless electric flocculation technique is exchanged using full-wave rectification, is 50mA in electric current, 3 iron
Under the reaction condition of base BPE, T blank=6s, to the As (III) of 500 μ g/L after the processing of 20min electric flocculations, total arsenic in solution
Surplus be only 7.9 μ g/L.
Contrast experiment：
In simulated groundwater environment, using direct current electric flocculation technique, in the case where electric current is the reaction condition of 50mA, to 500 μ
The As (III) of g/L is after the processing of 20min electric flocculations, and the surplus of total arsenic is 462.7 μ g/L in solution.
Embodiment 2：
In simulated groundwater environment, wireless electric flocculation technique is exchanged using full-wave rectification, in 3 iron-based BPE, T blank
It is electric through 20min to the As (III) of 500 μ g/L when electric current to be adjusted to 5,10,20,40,50mA respectively under the reaction condition of=6s
After flocculation treatment, the surplus of total arsenic is respectively 181.5 μ g/L, 68.5 μ g/L, 7.9 μ of 357 μ g/L, 273.8 μ g/L in solution
g/L。
Embodiment 3：
In simulated groundwater environment, wireless electric flocculation technique is exchanged using full-wave rectification, is 50mA in electric current, T blank
Under the reaction condition of=6s, using 1,2,3 iron-based BPE to the As (III) of 500 μ g/L after the processing of 20min electric flocculations, solution
In the surplus of total arsenic be respectively 134.3 μ g/L, 56 μ g/L, 7.9 μ g/L.
Embodiment 4：
In simulated groundwater environment, wireless electric flocculation technique is exchanged using full-wave rectification, is 50mA in electric current, 3 iron
Base BPE, when selecting T blank=0s, 2s, when 4s, 6s, to the As (III) of 500 μ g/L after the processing of 20min electric flocculations, in solution
The surplus of total arsenic is respectively 222.2 μ g/L, 178.6 μ g/L, 87.8 μ g/L, 7.9 μ g/L.
Comparative example：
It is 50mA in electric current using the wireless electric flocculation technique of direct current in simulated groundwater environment, 3 iron-based BPE's is anti-
Should under the conditions of, to the As (III) of 500 μ g/L after the processing of 20min electric flocculations, the surplus of total arsenic is respectively 27.8 μ in solution
G/L, is can be found that when T blank is 6s by the contrast test, can effectively alleviate the passivation of electrode, promotes consolidating for total arsenic in solution
Determine removing amount.
Claims (10)
- A kind of 1. method suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that：Using iron-based material and inertia Material is respectively as bipolar electrode and driving electrodes；Direct current is converted to full-wave rectification alternating current using transduction equipment to realize The periodical exchange of polarity of electrode, adjusts electrode and falls the blank reaction time T of clearance between polesBlankTo alleviate in direct current flocculation system The passivation of electrode；Adjust the size of electric current and the number of iron-based BPEs realizes the ferrous ion quilt of iron-based BPEs generations in system The O that driving electrodes produce2Be oxidized to the stronger ferric ion of flocculation ability, at the same by trivalent arsenic ionic oxide formation for tetravalence arsenic from Son.
- 2. it is suitable for the method for anoxic Arsenic Contamination in Groundwater in-situ immobilization as claimed in claim 1, it is characterised in that using such as Lower equipment is realized：One kind is suitable for anoxic Arsenic Contamination in Groundwater in-situ repairing device, including power supply, transduction equipment, driving electrodes, Bipolar electrode, water pump, power supply are connected with transduction equipment, and DC conversion is full-wave rectification alternating current by transduction equipment, conversion Instrument connects two driving electrodes respectively, and bipolar electrode is equipped between driving electrodes；Above device is installed on underground water pollution Pinnule downstream, a permeable conversion zone is set up in water-bearing layer, driving electrodes and bipolar electrode is introduced permeable anti- Region is answered, contaminated underground water is extracted out after the purification of permeable conversion zone through water pump.
- 3. the method according to claim 1 or 2 suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that： Transduction equipment is the time relay or component pulse-changing power.
- 4. the method according to claim 1 or 2 suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that： Iron-based BPEs materials as bipolar electrode are iron or stainless steel.
- 5. the method according to claim 1 or 2 suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that： Inert material as driving electrodes is titanium-based IrO2/Ta2O5One kind in composite material, graphite or metal platinum.
- 6. the method according to claim 1 or 2 suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that： Power supply is DC power supply or solar panels.
- 7. the method according to claim 1 or 2 suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that： Electrode falls the blank reaction time T of clearance between polesBlank≥6.0s。
- 8. the method according to claim 1 or 2 suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that： Power supply is low-voltage DC, and current range is 5mA~100mA.
- 9. the method according to claim 1 or 2 suitable for anoxic Arsenic Contamination in Groundwater in-situ immobilization, it is characterised in that： Number N >=1 of iron-based BPEs.
- 10. it is suitable for the device of anoxic Arsenic Contamination in Groundwater in-situ immobilization described in a kind of claim 1, it is characterised in that：One Kind is suitable for anoxic Arsenic Contamination in Groundwater in-situ repairing device, including power supply, transduction equipment, driving electrodes, bipolar electrode, water Pump, power supply are connected with transduction equipment, and DC conversion is full-wave rectification alternating current by transduction equipment, and transduction equipment connects two respectively A driving electrodes, are equipped with bipolar electrode between driving electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711348446.3A CN107973379A (en) | 2017-12-15 | 2017-12-15 | Method suitable for in-situ remediation of arsenic pollution of anoxic underground water |
Applications Claiming Priority (1)
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| CN2908475Y (en) * | 2006-01-20 | 2007-06-06 | 华南理工大学 | Electrolytic treatment device of industrial waste water containing metal ion |
| US20090008267A1 (en) * | 2007-07-05 | 2009-01-08 | Giovanni Del Signore | Process and method for the removal of arsenic from water |
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| US20090008267A1 (en) * | 2007-07-05 | 2009-01-08 | Giovanni Del Signore | Process and method for the removal of arsenic from water |
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