CN104815611B - A kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material - Google Patents
A kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material Download PDFInfo
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- CN104815611B CN104815611B CN201510173073.5A CN201510173073A CN104815611B CN 104815611 B CN104815611 B CN 104815611B CN 201510173073 A CN201510173073 A CN 201510173073A CN 104815611 B CN104815611 B CN 104815611B
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Abstract
A kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material, it includes the pretreatment of unmodified quartz sand, reactor operation and Modified Quartz Sand and prepares two parts.The exceeded underground water of iron manganese content enters filter post, Fe after spray aeration2+Self-catalyzed oxidating reaction occurs in filtering layer for ion, FeOOH layers of γ is formed on sand face, filter post and run the laggard line period backwashes of 24~36h, eluriate and combine loose γ FeOOH, with the extension of run time, FeOOH layers of the γ of filter sand covering surface is increasingly thicker, quartz sand particle size also increases therewith, so far the larger particle of compactness is obtained, finally stop operation, coating γ FeOOH quartz sand is taken out, drying finally gives 0.8~2mm of particle diameter absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material.The present invention is simple and easy to apply, the depth Adsorption of the filter material being made phosphorus in exceeded arsenic processing and sewage second-level biological treatment water outlet suitable for underground water.
Description
Technical field：
The present invention relates to modified quartz sand filter material, and in particular to a kind of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material
Preparation method.
Background technology：
The chronic local arsenic poisoning caused in groundwater environment due to the long-term exposure of doses arsenic has caused world's model
The extensive concern enclosed.Generally contain arsenic in China Inner Mongol, Taiwan, Shanxi, Guizhou wide geographic area underground water, have a strong impact on resident and be good for
Health.Therefore, Environmental Protection Agency (USEPA) regulation Drinking Water for Residents arsenic content is no more than 10ug/L, China GB5749-
Arsenic in Drinking Water standard is also set to 10ug/L by 2006.Conventional dearsenicating method has：Absorption method, ion-exchange, film process, electricity
Chemical method, bioanalysis etc., the advantage and disadvantage of the various methods of Comprehensive Correlation, absorption method are simple and easy to apply, most widely used, commonly use absorption
Agent has iron-aluminium oxide etc..
Phosphorus is the key factor for causing body eutrophication, when phosphorus content is exceeded in water body, easily causes algae and other
The rapid breeding of planktonic organism, declines Dissolved Oxygen in Water content, causes aquatile and fish dead, water environment degradation.It is raw
Thing method dephosphorization efficiency is limited, and water outlet is generally 1mg/L or so, and second pond has phosphorus release, is extremely difficult to national sewage disposal
Factory first discharge standard 0.5mg/L.Absorption method dephosphorization efficiency is higher, can be reused by reproducing adsorbent, and be conducive to
The depth of phosphorus is removed, and iron and manganese oxides is used as dephosphorization adsorbent.
Quartz sand is a kind of to be widely used in various Water purifications, sewage disposal and the water-purifying material of environmental improvement.But by
Few in quartz sand filter media surface pore, specific surface area and isoelectric point are relatively low, negatively charged under normal operation so that it in water to having
Noxious material such as heavy metal ion etc., bacterium, virus and organic matter removal effect it is undesirable.At present, that develops both at home and abroad is various
Novel filtering material is all towards improving filter material surface characteristic, improves the retaining power progress of filtrate.Iron oxide modified quartz sand is
Research and application are wider, and ferric oxide particles have higher specific surface area and surface charge so that iron oxide modified quartz sand
Filtrate not only has retention functions, and adds adsorption potential in quartz sand surface, and research shows iron oxide modified quartz sand
(IOCS) there is higher absorption property for arsenic in water and phosphorus.
Conventional iron oxide modified quartz sand filter material preparation method mainly has heating vaporization and repeated precipitation process.Heating is steamed
Hair method is to make metal salt hydrolysis produce hydroxide by heating to precipitate, be then transformed into metal oxide and be attached to filtrate table
Face, then becomes metal oxide；Repeated precipitation process is to generate precipitate metal hydroxides by metal salt and alkali reaction, then
Become metal oxide.According to experiment experience, containing Fe2+Quartz sand surface coating can be made a large amount of in water filtration purification process
γ-FeOOH, the method are used as the preparation of modified filter material, killed two birds with one stone, and γ-FeOOH coatings amount is big, and modified effect is good.
The content of the invention：
It is modified it is an object of the invention to provide a kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material
Quartz sand is used for the depth absorption of phosphorus in secondary biochemical treatment water outlet in the Adsorption of arsenic in source water and sewage disposal
Remove.
The iron oxide modified quartz sand filter material of the present invention, including quartz sand carrier and the oxidation that is wrapped on above-mentioned carrier
Iron adsorption layer, iron oxide adsorption layer is mainly made up of γ-FeOOH particles.
The quartz sand diameter of carrier that the present invention is used is 0.6~1.0mm, with the extension of filtration time, and γ-FeOOH are draped over one's shoulders
The amount of covering increasess slowly, and excessive-FeOOH layers of the γ for easily causing coating of particle diameter comes off, and conventional particle diameter of filter medium should not mistake
Greatly, therefore, it is 0.8~2mm that modified quartz sand filter material particle diameter is selected in the present invention.
A kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material, it is characterised in that：Grain will be cleaned
Footpath is layed in filter post upper strata for 0.6~1.0mm quartz sand, and thickness is 700mm, and lower floor is that gravel supporting layer thickness is 200mm,
Extract certain F e2+Ion concentration and Mn2+The exceeded underground water of ion concentration, wherein Fe2+Ion concentration>0.3mg/L, Mn2+Ion is dense
Degree>After 0.1mg/L, spray aeration, filtered with 6~10m/h filtering velocitys by quartzy sand filter blanket, Fe2+Ion occurs certainly in filtering layer
Catalytic oxidation, forms-FeOOH layers of γ on sand face, and filter post runs the laggard line period backwashes of 24~36h, eluriates and combine
Loose γ-FeOOH, with the extension of run time ,-FeOOH layers of the γ of filter sand covering surface is increasingly thicker, quartz sand particle size
Also increase therewith, can obtain the larger particle of compactness after 20~30d of operation, finally stop operation, by coating γ-FeOOH
Quartz sand take out, drying, finally give 0.8~2mm of particle diameter absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material.
Further, spray aeration ensures that dissolved oxygen DO maintains 4~5mg/L in filter tank.
The present invention uses Fe2+Salt contact-catalytic oxidation method is washed in a pan in quartz sand surface coating γ-FeOOH, and using backwash
The effect of washing, ultimately forms the Modified Quartz Sand of the fine and close coatings of γ-FeOOH, γ-FeOOH coating amounts are up to 50mg/g~200mg/
G, and commonly soak i.e. FeCl3Salting liquid constant temperature infusion method γ-FeOOH coating amounts are only 8mg/g or so.
Element of Fe percentage by weight, atomic percent be not compared in absorption arsenic removal dephosphorization iron oxide modified quartz sand of the present invention
Modified Quartz Sand is improved suddenly, and γ-FeOOH coatings amounts are up to 50mg/g~200mg/g, and the filter material adsorption capacity is larger, and hole
Gap is closely knit.
Brief description of the drawings：
Fig. 1-experimental rig schematic diagram.
1- water tank inlet 2- water pump 3- valve 4- flowmeter 5- spray heads 6- filters post 7- bed courses
8- backwashes water tank
Fig. 2-unmodified quartz sand filter material amplifies 50 times of SEM scanning electron microscope (SEM) photographs.
Fig. 3-unmodified quartz sand amplifies 2000 times of SEM scanning electron microscope (SEM) photographs.
Fig. 4-absorption arsenic removal dephosphorization iron oxide modified quartz sand amplifies 50 times of SEM scanning electron microscope (SEM) photographs.
Fig. 5-absorption arsenic removal dephosphorization iron oxide modified quartz sand amplifies 2000 times of SEM scanning electron microscope (SEM) photographs.
Fig. 6-unmodified quartz sand filter material X-ray energy spectrum analysis
(explanation：Acquisition condition：Accelerating potential：15.00keV live times：59 seconds angles of emergence：34.17 degree)
Fig. 7-absorption arsenic removal dephosphorization iron oxide modified quartz sand X-ray energy spectrum analysis
(explanation：Acquisition condition：Accelerating potential：15.00keV live times：59 seconds angles of emergence：34.17 degree)
Embodiment
The spray aeration form that the present invention is used is aerated for shower nozzle, sets shower nozzle away from water surface elevation as 0.5m, can
Ensure that dissolved oxygen DO maintains 4-5mg/L in filter tank, the demand to DO except iron can be met.
Embodiment one
First, unmodified quartz sand pretreatment
1. screening undressed quartz sand with the screen cloth that aperture is respectively 0.6mm and 1.0mm, obtaining diameter range is
0.6mm~1.0mm the quartz sand filter media for treating surface preparation.
2. being rinsed well repeatedly with running water, its surface contaminant and other impurity are removed.
2nd, reactor operation and the preparation of Modified Quartz Sand
Standby quartz sand is placed in above-mentioned reactor, and extracts the exceeded underground water of iron manganese content and carries out filtering operation, ground
Fe in lower water2+Ion concentration 10mg/L, Mn2+Dissolved oxygen DO in ion concentration 0.6mg/L, filtering velocity 10m/h, spray aeration, filter post
4.5mg/L or so is maintained, post water outlet is not up to standard when filtering, i.e. iron concentration>0.3mg/L, manganese ion concentration>During 0.1mg/L,
Filter post is backwashed, using backwashing period 24h, backwashing time 5min~10min, back washing strength 12L/ (s
m2), 20d is run, γ-FeOOH Modified Quartz Sands are gradually formed, and final coating γ-FeOOH modified quartz sand filter material particle diameters are reachable
1~2mm.
Embodiment two
First, unmodified quartz sand pretreatment
1. screening undressed quartz sand with the screen cloth that aperture is respectively 0.6mm and 1.0mm, obtaining diameter range is
0.6mm~1.0mm the quartz sand filter media for treating surface preparation.
2. being rinsed well repeatedly with running water, its surface contaminant and other impurity are removed.
2nd, reactor operation and the preparation of Modified Quartz Sand
Standby quartz sand is placed in above-mentioned reactor, and extracts the exceeded underground water of iron manganese content and carries out filtering operation, ground
Fe in lower water2+Ion concentration 5mg/L, Mn2+Dissolved oxygen DO is tieed up in ion concentration 0.6mg/L, filtering velocity 8m/h, spray aeration, filter post
Hold in 4.5mg/L or so, when filtering, post water outlet is not up to standard, i.e. iron concentration>0.3mg/L, manganese ion concentration>It is right during 0.1mg/L
Filter post is backwashed, backwashing time 5min~10min, backwashing period 36h, back washing strength 12L/ (sm2), operation
30d, γ-FeOOH Modified Quartz Sands are gradually formed, final coating γ-FeOOH modified quartz sand filter materials particle diameters up to 0.8~
1.5mm。
The iron oxide modified quartz sand of table 1 and element of Fe content balance analysis result in unmodified quartz sand
Claims (1)
1. a kind of preparation method of absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material, it is characterised in that：Particle diameter will be cleaned
Filter post upper strata is layed in for 0.6~1.0mm quartz sand, Fe is extracted2+Ion concentration and Mn2+The exceeded underground water of ion concentration, its
Middle Fe2+Ion concentration>0.3mg/L, Mn2+Ion concentration>After 0.1mg/L, spray aeration, quartz is passed through with 6~10m/h filtering velocitys
Sand filter blanket is filtered, Fe2+Self-catalyzed oxidating reaction occurs in filtering layer for ion, and-FeOOH layers of γ, filter post operation are formed on sand face
The laggard line period backwashes of 24~36h, backwashing time 5min~10min, back washing strength 12L/ (sm2), eluriate and combine
Loose γ-FeOOH, with the extension of run time ,-FeOOH layers of the γ of filter sand covering surface is increasingly thicker, quartz sand particle size
Also increase therewith, take out coating γ-FeOOH quartz sand after 20~30d of operation, drying finally gives 0.8~2mm of particle diameter
Absorption arsenic removal dephosphorization iron oxide modified quartz sand filter material；Spray aeration ensures that dissolved oxygen DO maintains 4-5mg/L in filter tank.
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| CN106006946A (en) * | 2016-05-26 | 2016-10-12 | 南京大学 | Electrolytically modified quartz sand filter bed and application thereof |
| 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 |
| 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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| CN101632880B (en) * | 2009-08-03 | 2011-08-17 | 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 |
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