CN105016436A - Method for removing arsenic by iron and carbon through reinforcement with magnetic field - Google Patents
Method for removing arsenic by iron and carbon through reinforcement with magnetic field Download PDFInfo
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- CN105016436A CN105016436A CN201510382100.XA CN201510382100A CN105016436A CN 105016436 A CN105016436 A CN 105016436A CN 201510382100 A CN201510382100 A CN 201510382100A CN 105016436 A CN105016436 A CN 105016436A
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Abstract
The invention relates to a method for removing arsenic by iron and carbon through reinforcement with magnetic field, which is characterized in that magnetic field can be applied around a reaction tank, zero-valent iron and particle activated carbon are added in waste water in the reaction tank polluted by arsenic, so that water can be purified under outside force stirring. According to the invention, various types of arsenic-containing water can be effectively processed, utilization rate of iron and carbon can be increased, consumption of an agent is reduced, and reaction rate is accelerated. When the reaction is carried out, operation is simple, control is easy, and the method has the advantages of economy and cost saving.
Description
Technical field
The invention belongs to water-treatment technology field, relate to the method for a kind of magnetic field-intensification iron carbon arsenic removal particularly.
Background technology
Arsenic and species of Arsenic is the confessed carcinogens of many authoritative institutions such as international cancer institute (IARC), U.S. environment hygienic science research institute (NlEHS), EPA (USEPA) of the World Health Organization (WHO) subordinate.Long-term drinking height arsenic water, black leg, neurodynia, blood vessel injury can be caused and increase heart disease, so the maximum permissible concentration of China's arsenic in the middle regulation Drinking Water of new drinking water sanitary standard (GB5749-2006) promulgated in December, 2006 is 10 μ g/L.
According to investigations, in China's drinking-water, the drink population of concentration within the scope of 30 ~ 49 μ g/L of arsenic is 9,020,000 people, and in water, arsenic concentration is the population of drinking of 50 ~ 99 μ g/L is 3,340,000 people, and in water, arsenic concentration is 2,290,000 people more than the population of drinking of 100 μ g/L.Xinjiang, the Inner Mongol, Shaanxi, Guizhou, Jilin, Ningxia, Qinghai etc. are economized, more municipal cities also exist the problem that Arsenic in Drinking Water exceeds standard all to some extent, and in crowd, causing the phenomenon of arseniasis, poisoning geographic coverage is big considerably beyond Bangladesh.Therefore the arsenic that efficient at Chinese development, inexpensive method is removed in tap water has been problem demanding prompt solution.
Rail carbon micro-electrolytic processes as a kind of economical and efficient, the waste water treatment process that easy and simple to handle and material is cheap and easy to get, can pass through redox, adsorption and throwing out remove in water body containing arsenic pollutent.But rail carbon micro-electrolytic processes also also exists weak point, as when pH value is lower, the stripping quantity of iron increases, and iron ion content in water body is exceeded standard; And reacted after alkali neutralization stage produce a large amount of iron content and to give up mud; Easy formation is hardened or is occurred channeling, reduces treatment effect; Easily there is the phenomenons such as passivation in anode.The technique of current strengthening iron-carbon micro-electrolysis mainly contains: ultrasound-enhanced, extra electric field is strengthened, the many metallic substance of anode are prepared and add other reagent etc.
Magnetic phenomenon is a kind of ubiquitous physical phenomenon, and just have investigator to study the impact of magnetic field on chemical reaction as far back as the twenties in 20th century, the magnetic force that magnetic field produces can change the outermost electron motion of material, thus has an impact to chemical reaction.Also do not report that magnetic field-intensification rail carbon micro-electrolytic processes removes the research of organic pollutant in percolate at present both at home and abroad.
Summary of the invention
The object of this invention is to provide the method for a kind of magnetic field-intensification iron carbon arsenic removal, to utilize magnetic field-intensification rail carbon micro-electrolytic processes process arsenic-containing water, reduce anode passivation, accelerating anode reacts, and improves speed of reaction and removal effect that technique removes arsenic.
For achieving the above object, the method for magnetic field-intensification iron carbon provided by the invention arsenic removal, applies magnetic field outside around reaction tank, adds Zero-valent Iron and granulated active carbon in the waste water that arsenic pollutes in reaction tank, and external force makes water body be purified under stirring.
In described method, the pH value of waste water is 3.0-6.5.
In described method, the weight ratio of Zero-valent Iron and granulated active carbon is 1:5-5:1.
In described method, in waste water, the add-on of Zero-valent Iron and granulated active carbon is 10-30mg/L.
In described method, Zero-valent Iron is Nanoscale Iron.
In described method, the magneticstrength of externally-applied magnetic field is 40-200mT.
In described method, externally-applied magnetic field is the magnetic field of cryogenic magnet.
Compared with prior art, tool has the following advantages in the present invention:
The present invention is mainly for arsenic (As
5+) removal.Compared with prior art, technology of the present invention is based under the effect of superconducting magnet high-intensity magnetic field, the passivation of anode can be reduced, accelerating anode reacts, and utilizes magnetic field to improve the efficiency of iron-carbon micro-electrolysis, accelerates the removal speed of arsenic, improve iron carbon to the clearance of arsenic, improve the flocculation settling velocity containing arsenic flco and filtration velocity, reduce the dosage of iron carbon simultaneously, reduce processing cost.Water body is purified, use safety, the quality of water outlet can be ensured.
1, the present invention is compared with existing iron carbon removal arsenic technology, can improve the removal efficiency of iron carbon to arsenic, reduces the dosage of iron carbon simultaneously, improves the utilization ratio of iron carbon.
2, the present invention makes the environment of core-loss shape arsenic removal and range of application be widened, and effective pH scope of iron carbon removal arsenic is widened slightly acidic to the wider pH use range of strong basicity by weakly alkaline.Be not only applicable to anaerobic environment and be applicable to aerobic environment; Not only be applicable to trade effluent, and be applicable to groundwater treatment;
3, adopt the arsenic removal of cryogenic magnetic field strengthening iron carbon, utilize magnetic field can reduce restraint force between water molecules, change the structure of throw out, throw out granularity is increased, thus improve the subsidence rate of flco, shorten and react the settling time, reduce reactor volume.Meanwhile, significantly can improve the strainability of filter residue, improve the dewatering of slag.
4, the complete mix flow of the present invention to the arsenic removal of existing iron carbon is transformed easier, only needs to be placed in low temperature superconducting field.Adopt the advantage of low temperature superconducting field: magneticstrength variable range is large, can adjust magneticstrength according to actual needs; Cryogenic magnetic field can utilize space large, can be used for putting on large-scale reactor; Low temperature superconducting field is once cold-starting runs, and namely the wire loop producing magnetic field runs under superconducting state, and resistance is zero, so energy consumption is zero, utilizes low temperature superconducting field to strengthen the required extra running cost of iron carbon arsenic removal low.
Embodiment
Embodiment 1
Containing As in waste water
5+concentration is 5mg/L, and iron carbon dosage is 5g/L, and iron carbon mass ratio is 1:3.The effects is with or without iron carbon under magnetic field condition to the treatment effect of arsenic, and wherein have the condition in magnetic field to be cryogenic magnet, magneticstrength is 40mt, and experimental result shows, when being 30min when reacted, does not have the water outlet As in magnetic field
5+concentration is 3.35mg/L, and has the water outlet As in magnetic field
5+concentration is 1.03mg/L.
Embodiment 2
Containing As in waste water
5+concentration is 5mg/L, and iron carbon dosage is 5g/L, and iron carbon mass ratio is 1:1.The effects is with or without iron carbon under magnetic field condition to the treatment effect of arsenic, and wherein have the condition in magnetic field to be cryogenic magnet, magneticstrength is 40mt, and experimental result shows, when being 40min when reacted, does not have the water outlet As in magnetic field
5+concentration is 3.15mg/L, and has the water outlet As in magnetic field
5+concentration is 0.15mg/L.
Claims (7)
1. a method for magnetic field-intensification iron carbon arsenic removal, applies magnetic field outside around reaction tank, adds Zero-valent Iron and granulated active carbon in the waste water that arsenic pollutes in reaction tank, and external force makes water body be purified under stirring.
2. method according to claim 1, wherein, the pH value of waste water is 3.0-6.5.
3. method according to claim 1, wherein, the weight ratio of Zero-valent Iron and granulated active carbon is 1:5-5:1.
4. method according to claim 1, wherein, in waste water, the add-on of Zero-valent Iron and granulated active carbon is 10-30mg/L.
5. the method according to claim 1,3 or 4, wherein, Zero-valent Iron is Nanoscale Iron.
6. method according to claim 1, wherein, the magneticstrength of externally-applied magnetic field is 40-200mT.
7. the method according to claim 1 or 6, wherein, externally-applied magnetic field is the magnetic field of cryogenic magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510382100.XA CN105016436A (en) | 2015-07-02 | 2015-07-02 | Method for removing arsenic by iron and carbon through reinforcement with magnetic field |
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| CN201510382100.XA CN105016436A (en) | 2015-07-02 | 2015-07-02 | Method for removing arsenic by iron and carbon through reinforcement with magnetic field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024008124A1 (en) * | 2022-07-05 | 2024-01-11 | The Hong Kong Polytechnic University | Water treatment system using a magnetic confinement method |
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| US20130099153A1 (en) * | 2011-10-23 | 2013-04-25 | Postech Academy-Industry Foundation | Hybrid material comprising graphene and iron oxide, method for manufacturing the same, and apparatus for treating waste water using the same |
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| WO2024008124A1 (en) * | 2022-07-05 | 2024-01-11 | The Hong Kong Polytechnic University | Water treatment system using a magnetic confinement method |
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Application publication date: 20151104 |