CN104815611A - Preparation method of iron oxide modified quartz sand filter material for adsorption removal of arsenic and phosphorus - Google Patents
Preparation method of iron oxide modified quartz sand filter material for adsorption removal of arsenic and phosphorus Download PDFInfo
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- CN104815611A CN104815611A CN201510173073.5A CN201510173073A CN104815611A CN 104815611 A CN104815611 A CN 104815611A CN 201510173073 A CN201510173073 A CN 201510173073A CN 104815611 A CN104815611 A CN 104815611A
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Abstract
A preparation method of an iron oxide modified quartz sand filter material for adsorption removal of arsenic and phosphorus comprises two parts, namely pretreatment of unmodified quartz sand and reactor operation and modified quartz sand preparation. Underground water containing excessive ferro-manganese contents undergoes spray aeration and then enters a filter column; Fe<2+> ions are subjected to a self-catalyzed oxidating reaction in the filter layer to form a gamma-FeOOH layer on a sand surface; after operating for 24-36h, the filter column undergoes periodic backwashing to wash loose gamma-FeOOH; with increasing of the operation time, the gamma-FeOOH layer which covers the surface of the filter sand is thicker and thicker, and particle size of quartz sand is also increasing so as to obtain particles with high degree of density; and finally, the operation stops, the gamma-FeOOH-coated quartz sand is taken out and dried so as to finally obtain the iron oxide modified quartz sand filter material for adsorption removal of arsenic and phosphorus with the particle size being 0.8-2 mm. The preparation method is simple and easy to operate. The prepared filter material is suitable for treatment of excessive arsenic in underground water and deep adsorption removal of phosphorus in an effluent from secondary biological treatment of sewage.
Description
Technical field:
The present invention relates to modified quartz sand filter material, be specifically related to a kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material.
Background technology:
The chronic local arsenic poisoning caused because doses arsenic exposes for a long time in groundwater environment has caused worldwide extensive concern.Generally containing arsenic in China Inner Mongol, Taiwan, Shanxi, Guizhou wide geographic area underground water, have a strong impact on residents ' health.Therefore, Environmental Protection Agency (USEPA) regulation Drinking Water for Residents arsenic content can not more than 10ug/L, and Arsenic in Drinking Water standard is also decided to be 10ug/L by China GB5749-2006.Conventional dearsenicating method has: absorption method, ion-exchange, film process, electrochemical process, bioanalysis etc., the pluses and minuses of the various method of Comprehensive Correlation, and absorption method is simple, and use the most extensive, conventional adsorbent has iron-aluminium oxide etc.
Phosphorus is the key factor causing body eutrophication, when phosphorus content exceeds standard in water body, easily causes algae and other planktonic rapid breeding, Dissolved Oxygen in Water content is declined, causes aquatile and fish kills, water environment degradation.Bioanalysis dephosphorization efficiency is limited, and water outlet is generally about 1mg/L, and second pond has Phosphurus release, is difficult to reach national sewage treatment plant first discharge standard 0.5mg/L.Absorption method dephosphorization efficiency is higher, can be reused by reproducing adsorbent, and the degree of depth being conducive to phosphorus is removed, and iron and manganese oxides is many as dephosphorization adsorbent.
Quartz sand is a kind of water-purifying material being widely used in various Water purification, sewage disposal and environmental improvement.But because quartz sand filter media surface pore is few, specific area and isoelectric point lower, electronegative under normal operation, make it as undesirable in heavy metal ion etc., bacterium, virus and organic removal effect to noxious material in water.At present, the various novel filtering materials of development are both at home and abroad all towards improving filter material surface characteristic, and the retaining power improving filtrate carries out.Iron oxide modified quartz sand is that Study and appliance is wider, ferric oxide particles has higher specific area and surface charge, iron oxide modified quartz sand filtrate is made not only to have retention functions, and adding adsorption potential at quartz sand surface, research shows that iron oxide modified quartz sand (IOCS) all has higher absorption property for arsenic in water and phosphorus.
Conventional iron oxide modified quartz sand filter material preparation method mainly contains heating vaporization and repeated precipitation process.Heating vaporization by heating, slaine is hydrolyzed to produce precipitation of hydroxide, be then transformed into metal oxide and be attached to filter material surface, then become metal oxide; Repeated precipitation process generates precipitate metal hydroxides by slaine and alkali reaction, then becomes metal oxide.According to test experience, containing Fe
2+can make a large amount of γ of quartz sand surface coating-FeOOH in water filtration purification process, the method is used as the preparation of modified filter material, kill two birds with one stone, γ-FeOOH coating amount is large, and modified effect is good.
Summary of the invention:
The object of this invention is to provide a kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material, Modified Quartz Sand is used to the degree of depth Adsorption of phosphorus in secondary biochemical treatment water outlet in the Adsorption of arsenic in source water and sewage disposal.
Iron oxide modified quartz sand filter material of the present invention, comprises quartz sand carrier and is wrapped in the iron oxide adsorption layer on above-mentioned carrier, and iron oxide adsorption layer forms primarily of γ-FeOOH particle.
The quartz sand diameter of carrier that the present invention adopts is 0.6 ~ 1.0mm, along with the prolongation of filtration time, γ-FeOOH coating amount increasess slowly, excessive γ-FeOOH the pull-up of coating that easily causes of particle diameter falls, and conventional particle diameter of filter medium is unsuitable excessive, therefore, modified quartz sand filter material particle diameter is selected to be 0.8 ~ 2mm in the present invention.
A preparation method for absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material, is characterized in that: be that the quartz sand of 0.6 ~ 1.0mm is layed in filter post upper strata by cleaned particle diameter, thickness is 700mm, and lower floor is gravel supporting layer thickness is 200mm, extracts certain F e
2+ion concentration and Mn
2+ion concentration exceeds standard underground water, wherein Fe
2+ion concentration >0.3mg/L, Mn
2+ion concentration >0.1mg/L, after spray aeration, is filtered by quartz sand filtering layer with 6 ~ 10m/h filtering velocity, Fe
2+self-catalyzed oxidating reaction is there is in ion in filtering layer, sand face is formed γ-FeOOH layer, filter post runs the laggard line period backwash of 24 ~ 36h, eluriate in conjunction with loose γ-FeOOH, along with the prolongation of running time, γ-FeOOH the layer of filter sand covering surface is more and more thicker, quartz sand particle size also increases thereupon, the larger particle of packing can be obtained after running 20 ~ 30d, last shut-down operation, the quartz sand of coating γ-FeOOH is taken out, dries, finally obtain the absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material of particle diameter 0.8 ~ 2mm.
Further, spray aeration and guarantee that in filter tank, dissolved oxygen DO maintains 4 ~ 5mg/L.
The present invention uses Fe
2+salt contact-catalytic oxidation method at quartz sand surface coating γ-FeOOH, and utilizes backwash elutriation effect, and finally form the Modified Quartz Sand of the fine and close coating of γ-FeOOH, γ-FeOOH coating amount can reach 50mg/g ~ 200mg/g, and common immersion and FeCl
3salting liquid constant temperature infusion method γ-FeOOH coating amount is only about 8mg/g.
In absorption arsenic removal dephosphorization iron oxide modified quartz sand of the present invention, element of Fe percentage by weight, atomic percent are compared unmodified quartz sand and are suddenly improved, and γ-FeOOH coating amount can reach 50mg/g ~ 200mg/g, and this filter material adsorption capacity is comparatively large, and hole is closely knit.
Accompanying drawing illustrates:
Fig. 1-experimental rig schematic diagram.
1-water tank inlet 2-water pump 3-valve 4-flowmeter 5-spray head 6-filters post 7-bed course
8-backwash water tank
Fig. 2-unmodified quartz sand filter material amplifies the SEM scanning electron microscope (SEM) photograph of 50 times.
Fig. 3-unmodified quartz sand amplifies the SEM scanning electron microscope (SEM) photograph of 2000 times.
Fig. 4-absorption arsenic removal dephosphorization iron oxide modified quartz sand amplifies the SEM scanning electron microscope (SEM) photograph of 50 times.
Fig. 5-absorption arsenic removal dephosphorization iron oxide modified quartz sand amplifies the SEM scanning electron microscope (SEM) photograph of 2000 times.
Fig. 6-unmodified quartz sand filter material X-Ray Energy Spectrum Analysis
(illustrating: acquisition condition: accelerating potential: 15.00keV live time: 59 seconds angles of emergence: 34.17 degree)
Fig. 7-absorption arsenic removal dephosphorization iron oxide modified quartz sand X-Ray Energy Spectrum Analysis
(illustrating: acquisition condition: accelerating potential: 15.00keV live time: 59 seconds angles of emergence: 34.17 degree)
Detailed description of the invention
The spray aeration form that the present invention adopts is shower nozzle aeration, and setting shower nozzle is 0.5m apart from water surface elevation, can guarantee that in filter tank, dissolved oxygen DO maintains 4-5mg/L, can meet the demand of deironing to DO.
Embodiment one
One, unmodified quartz sand pretreatment
1. screen undressed quartz sand with the screen cloth that aperture is respectively 0.6mm and 1.0mm, obtain the quartz sand filter media treating surface preparation that diameter range is 0.6mm ~ 1.0mm.
2. repeatedly rinse well with running water, remove its surface contaminant and other impurity.
Two, the preparation of reactor operation and Modified Quartz Sand
Bondstone sand is placed in above-mentioned reactor, and extract iron manganese content exceed standard underground water carry out filtration run, Fe in underground water
2+ion concentration 10mg/L, Mn
2+ion concentration 0.6mg/L, filtering velocity 10m/h, spray aeration, in filter post, dissolved oxygen DO maintains about 4.5mg/L, when the water outlet of filter post is not up to standard, i.e. iron concentration >0.3mg/L, during manganese ion concentration >0.1mg/L, backwash is carried out to filter post, adopts backwashing period 24h, backwashing time 5min ~ 10min, back washing strength 12L/ (sm
2), run 20d, γ-FeOOH Modified Quartz Sand and formed gradually, final coating γ-FeOOH modified quartz sand filter material particle diameter can reach 1 ~ 2mm.
Embodiment two
One, unmodified quartz sand pretreatment
1. screen undressed quartz sand with the screen cloth that aperture is respectively 0.6mm and 1.0mm, obtain the quartz sand filter media treating surface preparation that diameter range is 0.6mm ~ 1.0mm.
2. repeatedly rinse well with running water, remove its surface contaminant and other impurity.
Two, the preparation of reactor operation and Modified Quartz Sand
Bondstone sand is placed in above-mentioned reactor, and extract iron manganese content exceed standard underground water carry out filtration run, Fe in underground water
2+ion concentration 5mg/L, Mn
2+ion concentration 0.6mg/L, filtering velocity 8m/h, spray aeration, in filter post, dissolved oxygen DO maintains about 4.5mg/L, when the water outlet of filter post is not up to standard, i.e. iron concentration >0.3mg/L, during manganese ion concentration >0.1mg/L, backwash is carried out, backwashing time 5min ~ 10min to filter post, backwashing period 36h, back washing strength 12L/ (sm
2), run 30d, γ-FeOOH Modified Quartz Sand and formed gradually, final coating γ-FeOOH modified quartz sand filter material particle diameter can reach 0.8 ~ 1.5mm.
Element of Fe content balance analysis result in table 1 iron oxide modified quartz sand and unmodified quartz sand
Claims (2)
1. a preparation method for absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material, is characterized in that: be that the quartz sand of 0.6 ~ 1.0mm is layed in filter post upper strata by cleaned particle diameter, extract Fe
2+ion concentration and Mn
2+ion concentration exceeds standard underground water, wherein Fe
2+ion concentration >0.3mg/L, Mn
2+ion concentration >0.1mg/L, after spray aeration, is filtered by quartz sand filtering layer with 6 ~ 10m/h filtering velocity, Fe
2+there is self-catalyzed oxidating reaction in ion, sand face is formed γ-FeOOH layer in filtering layer, and filter post runs the laggard line period backwash of 24 ~ 36h, backwashing time 5min ~ 10min, back washing strength 12L/ (sm
2), eluriate in conjunction with loose γ-FeOOH, along with the prolongation of running time, γ-FeOOH the layer of filter sand covering surface is more and more thicker, quartz sand particle size also increases thereupon, after running 20 ~ 30d, the quartz sand of coating γ-FeOOH is taken out, dry, finally obtain the absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material of particle diameter 0.8 ~ 2mm.
2. preparation method according to claim 1, is characterized in that: spray aeration guarantees that in filter tank, dissolved oxygen DO maintains 4-5mg/L.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106006946A (en) * | 2016-05-26 | 2016-10-12 | 南京大学 | Electrolytically modified quartz sand filter bed and application thereof |
| CN107029656A (en) * | 2017-05-09 | 2017-08-11 | 北京工业大学 | The biologic filter for adding in-situ preparation adsorbent based on ferrimanganic salt purifies dearsenicating method |
| CN107973362A (en) * | 2017-12-22 | 2018-05-01 | 中国地质大学（武汉） | A kind of method and device for removing removing fluorine in water and arsenate at the same time based on hydrocalumite |
| CN109879477A (en) * | 2019-03-11 | 2019-06-14 | 江苏中电创新环境科技有限公司 | A kind of method for treating arsenic-containing wastewater |
| US10843182B2 (en) | 2017-11-17 | 2020-11-24 | Industrial Technology Research Institute | Composite material comprising porous silicate particles and active metals |
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| CN1296857A (en) * | 1999-11-18 | 2001-05-30 | 张云慧 | Groundwater filter for producing drinking water |
| CN101632880A (en) * | 2009-08-03 | 2010-01-27 | 北京工业大学 | High-efficiency biological purification filter layer and purification method of groundwater with high concentration of iron and manganese |
| CN103204579A (en) * | 2013-03-23 | 2013-07-17 | 北京工业大学 | Quick recovery method of biological deironing and manganese-removing filter technique |
| JP2015014594A (en) * | 2013-06-07 | 2015-01-22 | 株式会社オプテック | Adsorbent for radioactive material by inorganic foam and adsorption method |
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2015
- 2015-04-13 CN CN201510173073.5A patent/CN104815611B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296857A (en) * | 1999-11-18 | 2001-05-30 | 张云慧 | Groundwater filter for producing drinking water |
| CN101632880A (en) * | 2009-08-03 | 2010-01-27 | 北京工业大学 | High-efficiency biological purification filter layer and purification method of groundwater with high concentration of iron and manganese |
| CN103204579A (en) * | 2013-03-23 | 2013-07-17 | 北京工业大学 | Quick recovery method of biological deironing and manganese-removing filter technique |
| JP2015014594A (en) * | 2013-06-07 | 2015-01-22 | 株式会社オプテック | Adsorbent for radioactive material by inorganic foam and adsorption method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106006946A (en) * | 2016-05-26 | 2016-10-12 | 南京大学 | Electrolytically modified quartz sand filter bed and application thereof |
| CN107029656A (en) * | 2017-05-09 | 2017-08-11 | 北京工业大学 | The biologic filter for adding in-situ preparation adsorbent based on ferrimanganic salt purifies dearsenicating method |
| CN107029656B (en) * | 2017-05-09 | 2019-08-09 | 北京工业大学 | The biologic filter for adding in-situ preparation adsorbent based on ferrimanganic salt purifies dearsenicating method |
| US10843182B2 (en) | 2017-11-17 | 2020-11-24 | Industrial Technology Research Institute | Composite material comprising porous silicate particles and active metals |
| CN107973362A (en) * | 2017-12-22 | 2018-05-01 | 中国地质大学（武汉） | A kind of method and device for removing removing fluorine in water and arsenate at the same time based on hydrocalumite |
| CN109879477A (en) * | 2019-03-11 | 2019-06-14 | 江苏中电创新环境科技有限公司 | A kind of method for treating arsenic-containing wastewater |
| CN109879477B (en) * | 2019-03-11 | 2021-11-09 | 江苏中电创新环境科技有限公司 | Arsenic-containing wastewater treatment method |
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