CN112357984B - Silver-doped clay particles, preparation method thereof and biological sand filtering system - Google Patents
Silver-doped clay particles, preparation method thereof and biological sand filtering system Download PDFInfo
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- CN112357984B CN112357984B CN202011155514.6A CN202011155514A CN112357984B CN 112357984 B CN112357984 B CN 112357984B CN 202011155514 A CN202011155514 A CN 202011155514A CN 112357984 B CN112357984 B CN 112357984B
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- silver
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- sand
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- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention belongs to the technical field of water treatment, and particularly relates to silver-doped clay particles, a preparation method thereof and a biological sand filtering system. The biological sand filtering system comprises a barrel body and a filtering structure arranged in the barrel body, wherein the filtering structure comprises a gravel layer, a coarse sand layer, a particle layer formed by silver-doped clay particles, a zeolite layer and a fine sand layer which are sequentially paved in the barrel body, the biological sand filtering system further comprises a water outlet pipe, the water inlet end of the water outlet pipe penetrates through the filtering and extends to the bottom of the filtering barrel, and the water outlet end of the water outlet pipe extends out of the barrel body. The bio-sand filtration system of the present invention is capable of maintaining a constant microbiological and turbidity removal effect.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to silver-doped clay particles, a preparation method thereof and a biological sand filtering system.
Background
Water, environmental and personal hygiene, although improved over the years, is a serious concern worldwide. According to recent reports, there are over 10 hundred million families that cannot obtain safe drinking water, i.e. an improved water source that is not contaminated, and the round trip of the water source from the family to the collection point is no more than 30 minutes. In developed and developing countries, the installation of suitable centralized water treatment systems has proven to be the ultimate solution to the diseases associated with water, environmental sanitation and personal hygiene.
Based on some predictions of rural development, it is concluded that affected populations, such as scattered rural communities, will get a concentrated water supply in the near to intermediate future. The implementation of a decentralized water purification system remains a viable medium-short term solution in improving the water quality in affected areas, as well as many studies have demonstrated. These studies suggest that home water treatment systems can provide non-pathogenic potable water and can be modified to meet the basic needs of developing countries for safe, potable water. Studies have shown that biological sand filters are currently the most promising and sustainable home water treatment system with greater application potential worldwide than other available technologies.
The microbiological performance of existing biological sand filters depends on the maturation of the biofilm layer, which typically takes about four to six weeks. Therefore, the microorganism removing performance of the bio sand is difficult to be ensured before the filter is cleaned until another bio film layer is formed. These findings highlight the urgent need for improved biological sand filters for microbial removal before maturation and after cleaning.
Disclosure of Invention
Based on the above-mentioned drawbacks and deficiencies of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a silver-doped clay particle, a method for preparing the same, and a bio-sand filtration system which meet one or more of the above-mentioned needs.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a method for preparing silver-doped clay particles, comprising the following steps:
(1) Paper fiber and AgNO 3 Mixing the aqueous solutions, and drying to obtain AgNO loaded 3 Is a paper fiber of (a);
(2) Will be loaded with AgNO 3 Mixing the paper fiber with natural clay and wood dust, and molding into mixture particles;
(3) The mixture particles are sintered, then washed by brine and dried to obtain silver-doped clay particles.
Preferably, the sintering conditions include: the sintering temperature is 700-900 ℃, the sintering time is 5-12 h, and then the temperature is kept at 70-120 ℃ for 36-60 h.
Preferably, the AgNO 3 The concentration of the aqueous solution is 0.5-5 mol/L.
Preferably, the volume fraction of the brine is 0.5-1.5%.
The invention also provides silver-doped clay particles prepared by the preparation method according to any scheme.
Preferably, the particle size of the silver-doped clay particles is 1-10 mm.
The invention also provides a biological sand filtering system which comprises a barrel body and a filtering structure arranged in the barrel body, wherein the filtering structure comprises a gravel layer, a coarse sand layer, a particle layer, a zeolite layer and a fine sand layer which are sequentially paved in the barrel body, wherein the particle layer is formed by silver-doped clay particles according to any scheme, the filtering system further comprises a water outlet pipe, the water inlet end of the water outlet pipe penetrates through the filtering and extends to the bottom of the filtering barrel, and the water outlet end of the water outlet pipe extends to the outside of the barrel body.
Preferably, the water outlet pipe penetrates all layers of the filter structure.
As an optimal scheme, a static water level is further arranged in the barrel body and is positioned above the fine sand layer.
As an optimal scheme, a water tap is arranged at the water outlet end of the water outlet pipe.
Compared with the prior art, the invention has the beneficial effects that:
the silver-doped clay particles and biose filtration system of the present invention improve and maintain a constant microbial and turbidity removal effect as compared to typical biose filters that have inconsistent removal efficiency during maturation due to the silver-doped clay particles helping to bypass the maturation or maturation stage in the biose filtration system. The present invention can reduce turbidity to the 5NTU potable water limit acceptable to WHO, producing water with turbidity ranging from 0.30 to 0.90NTU, representing about 97 to 99% removal, while for microorganisms, completely removing escherichia coli and protozoan parasites from the influent water.
Drawings
Fig. 1 is a schematic structural view of a bio-sand filtration system according to embodiment 1 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Example 1:
the preparation method of the silver-doped clay particles comprises the following steps:
(1) 10mL of 1 mol-L (optionally 0.5-5 mol/L) AgNO 3 Mixing the aqueous solution with paper fibers, and drying at room temperature for later use;
(2) Mixing natural clay with wood dust and AgNO-loaded 3 Is mixed with paper fibers and then molded into fine mixture particles;
(3) The resulting mixture particles were fired at 887deg.C (optionally between 700 and 900deg.C) for 9 hours (optionally between 5 and 12 hours), then incubated at 90deg.C (optionally between 70 and 120deg.C) for 48 hours (optionally between 36 and 60 hours) to dry the particles; finally, the dried clay particles were washed with brine having a volume fraction of 0.9% (optionally between 0.5 and 1.5%) and dried again at room temperature to give silver-doped clay particles having a particle size of 10-15mm.
As shown in fig. 1, in the biological sand filtering system of the embodiment, a 25L water bucket 1 is selected as a filtering device, and gravel 2 with the thickness of 2.5cm and the grain size of 5-7mm is paved at the bottom of the filtering device in sequence; coarse sand 3 with the thickness of 2.5cm and the grain diameter of 0.95 mm; silver-doped clay particles 4 with the thickness of 2.5cm and the particle size of 10-15 mm; zeolite 5 having a thickness of 5cm and a particle size of 0.8 to 1.4 mm; fine sand 6 with the thickness of 5cm and the grain diameter of 0.15 mm; as a filtering structure. The filtering structure has a section of static water level 7 as buffer, which can continuously supplement untreated wastewater. A water outlet pipe 8 which passes through the whole filter material and is provided with a tap is paved from the bottom of the barrel, the water outlet pipe is preferably a hose, and the diameter of the water outlet pipe is 20mm and is used for discharging the filtered clean water. In addition, the water outlet pipe 8 extends outside the water tub 1 and is provided with a faucet 9.
The polluted water sample is taken as a water inlet sample, a 1L sampling bottle and a 25L water bucket are used for collecting the water inlet sample, the collected 1L sample is used for microbiological analysis of surface water, and the 25L water sample is used for filling the filtering device so as to simulate the household condition. The filter unit was filled with 20L of water and samples were collected from the tap of the filter unit using a 1L sterile sampling bottle. All sample bottles were autoclaved at 121 ℃ and placed under uv light and the containers and buckets were properly cleaned.
The collected samples were analyzed for quality parameters of potable water, and it was concluded that a biossand filtration system made of silver-doped clay particles having a particle size of 10-15mm and a thickness of 2.5cm could reduce turbidity to the 5NTU potable water limit acceptable to WHO, producing water with turbidity ranging from 0.93 to 1.2NTU, representing a removal rate of about 93%, whereas for microorganisms the filtration device completely removed escherichia coli and protozoan parasites from the influent water.
Example 2:
the silver-doped clay particles and biossand filtration system of this example are different from that of example 1 in that:
the particle size of the silver-doped clay particles was 1-10mm, and correspondingly, the thickness of the silver-doped clay particles in the bio-sand filtration system was 5cm, otherwise the same as in example 1.
The collected samples were analyzed for quality parameters of potable water, and it was concluded that a biossand filtration system made of silver-doped clay particles having a particle size of 1-6mm and a thickness of 5cm could reduce turbidity to the 5NTU potable water limit acceptable to WHO, producing water with turbidity ranging from 0.38 to 0.6NTU, representing a removal rate of about 98.6%, whereas for microorganisms the filtration device completely removed escherichia coli and protozoan parasites from the influent water.
The foregoing is only illustrative of the preferred embodiments and principles of the present invention, and changes in specific embodiments will occur to those skilled in the art upon consideration of the teachings provided herein, and such changes are intended to be included within the scope of the invention as defined by the claims.
Claims (4)
1. The biological sand filtering system is characterized by comprising a barrel body and a filtering structure arranged in the barrel body, wherein the filtering structure comprises a gravel layer, a coarse sand layer, a particle layer formed by silver-doped clay particles, a zeolite layer and a fine sand layer which are sequentially paved in the barrel body, and further comprises a water outlet pipe, the water inlet end of the water outlet pipe penetrates through the filtering and extends to the bottom of the filtering barrel, and the water outlet end of the water outlet pipe extends to the outside of the barrel body;
the grain diameter of the silver-doped clay grains is 1-6mm, and the thickness is 5cm;
the preparation method of the silver-doped clay particles comprises the following steps:
(1) Paper fiber and AgNO 3 Mixing the aqueous solutions, and drying to obtain AgNO loaded 3 Is a paper fiber of (a);
(2) Will be loaded with AgNO 3 Mixing the paper fiber with natural clay and wood dust, and molding into mixture particles;
(3) Sintering the mixture particles, then flushing with brine, and drying to obtain silver-doped clay particles;
the sintering conditions include: the sintering temperature is 700-900 ℃, the sintering time is 5-12 h, and then the temperature is kept for 36-60 h at 70-120 ℃;
the AgNO 3 The concentration of the aqueous solution is 0.5-5 mol/L;
the volume fraction of the brine is 0.5-1.5%.
2. A bio-sand filtration system according to claim 1, wherein the outlet pipe extends through all layers of the filtration structure.
3. The biological sand filtration system of claim 1 wherein a still water level is also provided in the tank above the fine sand layer.
4. The bio-sand filtration system of claim 1, wherein the outlet end of the outlet pipe is provided with a faucet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011155514.6A CN112357984B (en) | 2020-10-26 | 2020-10-26 | Silver-doped clay particles, preparation method thereof and biological sand filtering system |
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| CN202011155514.6A CN112357984B (en) | 2020-10-26 | 2020-10-26 | Silver-doped clay particles, preparation method thereof and biological sand filtering system |
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| CN112357984A CN112357984A (en) | 2021-02-12 |
| CN112357984B true CN112357984B (en) | 2023-09-01 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332507A (en) * | 2008-07-24 | 2008-12-31 | 重庆科技学院 | Silver clay and method for producing silver products using the silver clay |
| CN102666397A (en) * | 2010-09-03 | 2012-09-12 | 专业净化有限公司 | Water filtration device and method of using the same |
| CN104496515A (en) * | 2014-12-15 | 2015-04-08 | 江西理工大学 | Antibacterial diatomite-purple sand compound filter ceramic and preparation method thereof |
| CN104591779A (en) * | 2015-01-13 | 2015-05-06 | 江苏省环境科学研究院 | Nano-silver-particle-embedded porous ceramic sheet as well as preparation method and application thereof |
| CN105499597A (en) * | 2015-12-09 | 2016-04-20 | 陕西黄金集团西安秦金有限责任公司 | Preparation method for micron silver powder for silver clay, and preparation method for silver clay product |
| CN107265728A (en) * | 2017-06-22 | 2017-10-20 | 华北电力大学 | A kind of porous pottery water purifier of silver-colored N doping and preparation method thereof |
| CN108786718A (en) * | 2017-05-03 | 2018-11-13 | 钱李潜馨 | A kind of zeolite with carrying silver and preparation method thereof of drinking water quick sterilization |
-
2020
- 2020-10-26 CN CN202011155514.6A patent/CN112357984B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332507A (en) * | 2008-07-24 | 2008-12-31 | 重庆科技学院 | Silver clay and method for producing silver products using the silver clay |
| CN102666397A (en) * | 2010-09-03 | 2012-09-12 | 专业净化有限公司 | Water filtration device and method of using the same |
| CN104496515A (en) * | 2014-12-15 | 2015-04-08 | 江西理工大学 | Antibacterial diatomite-purple sand compound filter ceramic and preparation method thereof |
| CN104591779A (en) * | 2015-01-13 | 2015-05-06 | 江苏省环境科学研究院 | Nano-silver-particle-embedded porous ceramic sheet as well as preparation method and application thereof |
| CN105499597A (en) * | 2015-12-09 | 2016-04-20 | 陕西黄金集团西安秦金有限责任公司 | Preparation method for micron silver powder for silver clay, and preparation method for silver clay product |
| CN108786718A (en) * | 2017-05-03 | 2018-11-13 | 钱李潜馨 | A kind of zeolite with carrying silver and preparation method thereof of drinking water quick sterilization |
| CN107265728A (en) * | 2017-06-22 | 2017-10-20 | 华北电力大学 | A kind of porous pottery water purifier of silver-colored N doping and preparation method thereof |
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| CN112357984A (en) | 2021-02-12 |
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