CN102233261B - Filter medium for removing nitrite in drinking water and preparation method thereof - Google Patents
Filter medium for removing nitrite in drinking water and preparation method thereof Download PDFInfo
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- CN102233261B CN102233261B CN2011101627098A CN201110162709A CN102233261B CN 102233261 B CN102233261 B CN 102233261B CN 2011101627098 A CN2011101627098 A CN 2011101627098A CN 201110162709 A CN201110162709 A CN 201110162709A CN 102233261 B CN102233261 B CN 102233261B
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Abstract
The invention discloses a preparation method of a filter medium for removing nitrite in drinking water. The preparation method comprises the following steps: (a) mixing raw materials such as activated carbon powder, ultrahigh molecular weight polyethylene (UHMWPE), vermiculite powder, diatomite powder and a pore-forming agent at a weight ratio of (80-250):(150-400):(80-200):(60-150):(50-150); and (b) pressing, sintering and cooling the mixture obtained in the step (a) in a die to finally obtain the filter medium. The obtained filter medium has high removal rate for the nitrite in the water, thus being applicable to the drinking water polluted by the nitrite and preventing damage of the nitrite on a human body; the filter medium is simple in use and low in cost; and in addition, a filter element is used instead of powder without subsequent treatment, thus the filter medium provided by the invention is suitable for home terminal drinking water treatment. Detection shows that the filter medium has high removal rate for the nitrite in the drinking water and the removal rate is over 95%.
Description
Technical field
The present invention relates to a kind of filter medium of removing nitrite in the drinking water and preparation method thereof, the filter core, the water purifying plant and drinking Fountains that constitute by this filter medium.
Background technology
Because excessive nitrogen fertilizer application, China is the nitrate concentration constantly increase in underground water and the surface water in nearly decades, and nitrate can change into nitrite under the effect of nitrococcus, and according to investigation, China has the underground water in 1/3 city polluted by nitrite.The 62 mouthfuls of deep-well sampling results in Zhengzhou City, Henan were shown in 2000: wherein the nitrite of 21 mouthfuls of well water exceeds standard, and what have competes to exceed standard 50 times.
Nitrite is a kind of extremely toxic substance, and it can be oxidized to ferrihemoglobin with the low Ferri-hemoglobin in the red blood cell after getting into human body; Make its forfeiture take oxygen and oxygen delivery capacity; Cause histanoxia and a series of poisoning symptoms occur that present " intestines source property cyanosis ", serious meeting causes death; Nitrite makes fetus teratogenesis shape in addition, makes human carcinogen's danger, and it combines with amine in the human stomach, forms nitrosamine etc., is to cause the cancer of the stomach thing by force; Human long-term picked-up nitrite also can cause children mental retardation, the conditioned reflex dull of the vision and the sense of hearing.
The nitrite of removing in the drinking water at present has than multi-method, and oxidizing process is used O
3, ultraviolet light, H
2O
2Deng nitrite being carried out oxidation, but the loaded down with trivial details inconvenience of process; The counter-flushing liquid of ion-exchange is handled comparatively trouble, is prone to cause secondary pollution; The counter-infiltration cost is higher, needs a large amount of electric energy and water, and concentrate is difficult to handle, and is prone to produce secondary pollution.
Summary of the invention
The technical problem that the present invention solves provides a kind of filter medium and preparation method thereof, and this filter medium is high to the clearance of the nitrite in the drinking water, and the filter core, purifier and the water dispenser that are made up of this filter medium also are provided.
For addressing the above problem, the present invention adopts following technical scheme:
A kind of preparation method of filter medium that is used for removing the drinking water nitrite comprises the steps:
The raw material that a) will comprise activated carbon powder, ultra-high molecular weight polyethylene powder, vermiculite power, diatomite in powder and gas generation agent mixes, and the weight ratio of said activated carbon powder, ultra-high molecular weight polyethylene powder, vermiculite power, diatomite in powder and gas generation agent is: 80～250: 150～400: 80～200: 60～150: 50～150;
B) mixture of step a) gained is suppressed sintering, cooling in mould.
As preferably, the weight ratio of said activated carbon powder, ultra-high molecular weight polyethylene powder, vermiculite power, diatomite in powder and gas generation agent is: 120～200: 200～300: 100～180: 80～120: 80～120.
Pressing pressure is 0.4MPa～1.0MPa, and sintering temperature is 200 ℃～300 ℃, and sintering time is 120 minutes～150 minutes, is cooled to 40 ℃～60 ℃ demouldings behind the sintering.In this manufacturing process, after inventor's test many times, draw the filter medium of in 200 ℃～300 ℃, producing in sintering range, filter effect is better.
Active carbon is a kind of porous carbon adsorbent, and it has like cellular abundant pore structure, huge specific area, special surface functional group, stable physics and chemical property, is good adsorbent, catalyst or catalyst carrier.Can be divided into wood activated charcoal according to raw material sources different activities charcoal, like cocoanut active charcoal, apricot shell active carbon, wooden burgy etc.; The mineral raw material active carbon is the active carbon that raw material is processed like various coals and oil and elaboration products thereof; The active carbon that other raw material is processed, the active carbon of processing like scrap rubber, waste plastics etc.The specific area of preferred active carbon is not less than 500 meters squared per gram, more preferably is not less than 1000 meters squared per gram.
As preferably, it is the active carbon loading silver of 74 μ m～104 μ m that active carbon is selected particle diameter for use.Active carbon loading silver combines the adsorption capacity of active carbon and the antibiotic property of silver; Not only water pollutant there is suction-operated; The effect that also has bactericidal; Thereby can breed bacteria in the active carbon, avoid that content of nitrite increases in the water, can also remove peculiar smell and trace toxic harmful substance in the water.
Said ultra-high molecular weight polyethylene is a weight average molecular weight greater than 1,000,000 polyethylene, and preferred particle diameter is 89 μ m～104 μ m.Ultra-high molecular weight polyethylene can obtain from domestic production producer, and the product of M-I type (molecular weight is 150 ± 500,000), M-II type (molecular weight is 250 ± 500,000), M-III type (molecular weight is 350 ± 500,000), M-IV type specifications such as (molecular weight are greater than 4,000,000) can be provided like Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be.An effect of ultra-high molecular weight polyethylene is bonding and the effect that forms the filter medium skeleton; Because the molecular weight of ultra-high molecular weight polyethylene is big, melt viscosity is very high, and fusion can not be flowed later; So utilize ultra-high molecular weight polyethylene to pass through compacting; The filter medium that sintering obtains forms micropore easily, can play the effect of nitrite in the adsorbed water.
Vermiculite is a kind of natural, nontoxic mineral matter, under high temperature action, can expand.Vermiculite power is powdered through high-temperature roasting, screening, attrition process by the fabric and raw-vermiculite raw ore.Contain a lot of pores in the vermiculite power particle; Very big specific area is arranged, serve many purposes, can be used as construction material, fire-proof insulation material, soil conditioner etc.; The inventor uses it for the nitrite in the absorption drinking water after deliberation, has obtained good effect.As preferably, the particle diameter of vermiculite power of the present invention is 44 μ m～74 μ m.
Diatomite is made up of the remains of the very high diatom of oxycompound, radiolitid or sponge, and the silica type in the diatom skeleton is similar to opal or moisture silica, mainly by SiO
2Form, and contain a spot of Fe
2O
3, CaO, MgO, Al
2O
3And organic impurities.It is light yellow or light grey that diatomite is usually, and matter is soft, porous and lighter.Diatomite mainly originates in Shengzhou, Zhejiang Province city in China.
Usually can carry out modification to diatomite and handle the water treatment capacity that improves it, as preferably, the modification infusorial earth powder after the present invention selects for use and handles through modification.
Described diatomite is carried out the method that modification handles is method known in those skilled in the art: hydrochloric acid or sulfuric acid washing activation; Low temperature or high-temperature roasting activation, the method for modifying of for example being put down in writing among U.S. Pat 2701240 and the Chinese patent CN86106871A; Organic matter modification method, the employing cetyl trimethylammonium of for example being put down in writing among the Chinese patent CN200410079630.9 (CTMA), cetylpyridinium chloride (CPC) and polyacrylamide carry out modification to diatomite method.
After diatomite was handled with modification, oxide impurity content reduced, SiO
2Content increases, and specific area and pore volume also increase, so the carrier effect of terra silicea purificata is better than natural diatomaceous earth.
As preferably, it is that the modification infusorial earth powder of 89 μ m～124 μ m is used for the nitrite of adsorbed water that the present invention selects particle diameter for use.
Gas generation agent according to the invention is one type and is prone to the decomposition a large amount of gases of generation and causes a material of sending out the hole effect that wherein azo compound, sodium acid carbonate, carbonic hydroammonium, ammonium carbonate, sulphonyl nitrile compounds, oxalic acid etc. are its typical representatives.As preferably, gas generation agent is at least a in Celogen Az, food-grade carbonic hydroammonium, the oxalic acid.Wherein, food-grade carbonic hydroammonium is also claimed AMMONIUM BICARBONATE FOOD GRADE, distinguishes mutually with technical grade carbonic hydroammonium.Though technical grade carbonic hydroammonium also has the effect of sending out the hole, it may contain the impurity of insalubrity, should not be as the raw materials for production of drinking water filter medium.
The present invention has carried out comparatively detailed description for several kinds of used in the step a) among above-mentioned preparation method raw materials, and under the collaborative adduction of these several kinds of raw materials, the PPCPs in the water can be by abundant absorption.
In the present invention; For blend step; Can think that any low shear mixer or agitator that can significantly not change diameter of particle and size distribution all is suitable for; Such as the agitator with blunt impeller blade, drum-type blender, spiral agitator etc., rotating speed will be looked the type of blender and decide, but is advisable with the dust of avoiding kicking up.
Mixed powder is filled in the pre-designed mould, and with its compacting, pressure generally is not more than 2MPa through pressurization, and adapts with the material of mould therefor; Mould can be by aluminium, cast iron, steel or any suitable made that can bear relevant pressure and temperature.Can be in the mould inner surface release agent application, that can select silicone oil or any other for use can be adsorbed onto the commercially available releasing agent on the filter medium hardly, also can use processing release paper.
The present invention also provides following technical scheme: the filter core of nitrite in a kind of removal drinking water that is made up of above-mentioned filter medium.
The present invention also provides following technical scheme: a kind of purifier comprises above-mentioned filter medium or filter core.
The present invention also provides a kind of water dispenser that comprises above-mentioned purifier.
With respect to prior art, the invention has the advantages that the filter medium of preparation is high to the clearance of nitrite in the water, be applicable to the drinking water that receives its pollution; Exempt the injury that nitrite produces human body, easy to use, cost is low; Be filter core owing to what use in addition; Not powder,, be fit to home terminal drinking-water and handle so need not subsequent treatment.This filter medium of warp detection is more than 93% to the clearance of nitrite in the drinking water.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, describe just to further specifying feature and advantage of the present invention but should be appreciated that these, rather than to the restriction of claim of the present invention.
Embodiment 1:
(1) take by weighing medicinal active powdered carbon 100g, the particle diameter of said medical activated carbon is 74 μ m～104 μ m;
(2) take by weighing ultra-high molecular weight polyethylene powder 200g, said ultra-high molecular weight polyethylene is the M-II type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 2,500,000;
(3) take by weighing vermiculite power 180g, originate from the Lingshou County, Hebei and become and mineral products processing factory;
(4) take by weighing diatomite 100g, originate from the emerging imperial diatomite in Shengzhou and develop Products Co., Ltd;
(5) take by weighing food-grade carbonic hydroammonium 70g, purity reaches more than 99.99%;
(6) above-mentioned five kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(7) mixed powder packing is gone in the tubular die, in the hydraulic pressure pressed of 0.9MPa, 250 ℃ of sintering temperatures 130 minutes;
(8) naturally cool to 50 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
The diameter of the filter core of preparation is 50mm, and length is 200mm.
Embodiment 2:
(1) take by weighing active carbon loading silver powder 120g, the particle diameter of said active carbon loading silver is 74 μ m～104 μ m, originates from five rings, Guangzhou active carbon factory;
(2) take by weighing ultra-high molecular weight polyethylene powder 250g, said ultra-high molecular weight polyethylene is the M-III type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 3,500,000;
(3) take by weighing vermiculite power 120g, originate from Shijiazhuang City lattice Ruichang mining industry Co., Ltd;
(4) take by weighing diatomite 120g, originate from Qingdao Chuanyi Diatomite Co., Ltd.;
(5) take by weighing food-grade carbonic hydroammonium 100g, purity reaches more than 99.99%;
(6) above-mentioned five kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(7) mixed powder packing is gone in the tubular die, in the hydraulic pressure pressed of 0.8MPa, 230 ℃ of sintering temperatures 140 minutes;
(8) naturally cool to 60 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
The diameter of the filter core of preparation is 50mm, and length is 200mm.
Embodiment 3:
(1) take by weighing active carbon loading silver powder 220g, the particle diameter of said active carbon loading silver is 74 μ m～104 μ m, originates from five rings, Guangzhou active carbon factory;
(2) take by weighing ultra-high molecular weight polyethylene powder 380g, said ultra-high molecular weight polyethylene is the M-II type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 2,500,000;
(3) take by weighing vermiculite power 180g, originate from roc source, Shijiazhuang mineral products Co., Ltd;
(4) use concentration to be the sulfuric acid impregnation process of 6wt% 18 hours diatomite in powder, in caustic alkali, wash with the back, poach is 60 minutes again; Diatomite in powder after will boiling is dry, at 500 ℃ of roasting temperatures, is crushed to 89 μ m～124 μ m then, takes by weighing made modification infusorial earth powder 150g;
(5) take by weighing Celogen Az 120g, purity reaches more than 99.99%;
(6) above-mentioned five kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(7) mixed powder packing is gone in the tubular die, in the hydraulic pressure pressed of 0.6MPa, 260 ℃ of sintering temperatures 150 minutes;
(8) naturally cool to 50 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
The diameter of the filter core of preparation is 50mm, and length is 200mm.
Embodiment 4:
(1) take by weighing medicinal active powdered carbon 250g, the particle diameter of said medical activated carbon is 74 μ m～104 μ m;
(2) take by weighing ultra-high molecular weight polyethylene powder 350g, said ultra-high molecular weight polyethylene is the M-I type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 1,500,000;
(3) take by weighing vermiculite power 200g, originate from the Lingshou County, Hebei and become and mineral products processing factory;
During (4) with diatomite in powder roasting to 600 ℃, the water quenching, dry then, be crushed to 89 μ m～124 μ m and obtain the modification infusorial earth powder, take by weighing made modification infusorial earth powder 130g;
(5) take by weighing oxalic acid 150g, purity reaches more than 99.99%;
(6) above-mentioned five kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(7) mixed powder packing is gone in the tubular die, in the hydraulic pressure pressed of 0.5MPa, 300 ℃ of sintering temperatures 120 minutes;
(8) naturally cool to 40 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures.
The diameter of the filter core of preparation is 50mm, and length is 200mm.
Embodiment 5:
Get the tubulose filter core 1,2,3,4 of the many minute apertures of embodiment 1～4 gained; The liner two-layer nonwoven, the outsourcing two-layer nonwoven wraps polypropylene porous net at skin again; Bonding the going up in filter core two ends connects end cap, is positioned in stainless steel or the plastic casing, is used for Drinking Water; With the natrium nitrosum is example, and through detecting, this filter core is good to the removal effect of the nitrite in the drinking water.As shown in table 1, for adopting filter core that embodiment 1～4 the provides content to the natrium nitrosum before and after the drinking water treatment, the result shows that filter core provided by the invention is fit to the needs of home terminal drinking water treatment very much.
Table 1 uses filter core to handle the content of sodium nitrite in the water of front and back, unit: mg/L
Can find out that from table 1 nitrite that utilizes filter core of the present invention to remove in the water has been obtained good effect, clearance is more than 95%.
More than carried out detailed introduction to filter medium that is used for removing the drinking water nitrite provided by the present invention and preparation method thereof and by the filter core that this filter medium constitutes.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (5)
1. a preparation method of filter medium that is used for removing the drinking water nitrite is characterized in that, comprises the steps:
(1) take by weighing active carbon loading silver powder 220g, the particle diameter of said active carbon loading silver is 74 μ m～104 μ m, originates from five rings, Guangzhou active carbon factory;
(2) take by weighing ultra-high molecular weight polyethylene powder 380g, said ultra-high molecular weight polyethylene is the M-II type product of Second Factory of Auxiliary Agent of Orient Petrochemical Industry Co., Ltd., Be, and its molecular weight is 2,500,000;
(3) take by weighing vermiculite power 180g, originate from roc source, Shijiazhuang mineral products Co., Ltd;
(4) use concentration to be the sulfuric acid impregnation process of 6wt% 18 hours diatomite in powder, in caustic alkali, wash with the back, poach is 60 minutes again; Diatomite in powder after will boiling is dry, at 500 ℃ of roasting temperatures, is crushed to 89 μ m～124 μ m then, takes by weighing made modification infusorial earth powder 150g;
(5) take by weighing Celogen Az 120g, purity reaches more than 99.99%;
(6) above-mentioned five kinds of powder are put into the mechanical agitator stirring mixed in 10 minutes;
(7) mixed powder packing is gone in the tubular die, in the hydraulic pressure pressed of 0.6MPa, 260 ℃ of sintering temperatures 150 minutes;
(8) naturally cool to 50 ℃ of demouldings then, promptly get the tubulose filter core of many minute apertures;
The diameter of the filter core of preparation is 50mm, and length is 200mm.
2. the filter medium that is used for removing the drinking water nitrite that preparation method according to claim 1 obtains.
3. a filter core is characterized in that, is made up of the described filter medium of claim 2.
4. a purifier is characterized in that, comprises described filter medium of claim 2 or the described filter core of claim 3.
5. a water dispenser is characterized in that, comprises the described purifier of claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101627098A CN102233261B (en) | 2011-06-16 | 2011-06-16 | Filter medium for removing nitrite in drinking water and preparation method thereof |
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| CN2011101627098A CN102233261B (en) | 2011-06-16 | 2011-06-16 | Filter medium for removing nitrite in drinking water and preparation method thereof |
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| CN102233261A CN102233261A (en) | 2011-11-09 |
| CN102233261B true CN102233261B (en) | 2012-11-21 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143204B (en) * | 2013-03-27 | 2015-03-25 | 李彤 | Method for preparing active carbon composite filter core |
| CN104043288B (en) * | 2014-05-20 | 2016-04-06 | 浙江朝晖过滤技术股份有限公司 | Antibacterial filter core of a kind of Nano Silver diatomite and preparation method thereof |
| CN104028250B (en) * | 2014-06-24 | 2016-05-04 | 潘峰 | For removing filter medium, filter core and the preparation method of Aluminium in Drinking Water |
| CN104587959A (en) * | 2015-01-29 | 2015-05-06 | 慈溪市天泉电器科技有限公司 | Filter medium for removing endosulfan from water as well as filter element and preparation method of filter medium |
| CN106215511A (en) * | 2016-06-15 | 2016-12-14 | 山东智汇专利运营有限公司 | A kind of defecator of teaching and preparation method thereof |
| CN107126762A (en) * | 2017-05-22 | 2017-09-05 | 杭州铭族科技有限公司 | One kind removes medicine and personal care articles in drinking water（PPCPs）Filter medium, filter core and preparation method |
| CN108147509A (en) * | 2018-01-05 | 2018-06-12 | 厦门大学 | It is a kind of to carry silver-colored diatomite carbon membrane and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101683609A (en) * | 2008-09-26 | 2010-03-31 | 周奇迪 | Filter medium used for removing nitrite in water and preparation method thereof |
| CN101844005A (en) * | 2009-03-27 | 2010-09-29 | 周奇迪 | Filter medium for removing benzene and homologous compounds thereof from drinking water and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101683609A (en) * | 2008-09-26 | 2010-03-31 | 周奇迪 | Filter medium used for removing nitrite in water and preparation method thereof |
| CN101844005A (en) * | 2009-03-27 | 2010-09-29 | 周奇迪 | Filter medium for removing benzene and homologous compounds thereof from drinking water and preparation method thereof |
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