CN111115848A - Nano biological composite water purifying agent and preparation method thereof - Google Patents
Nano biological composite water purifying agent and preparation method thereof Download PDFInfo
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- CN111115848A CN111115848A CN201911420144.1A CN201911420144A CN111115848A CN 111115848 A CN111115848 A CN 111115848A CN 201911420144 A CN201911420144 A CN 201911420144A CN 111115848 A CN111115848 A CN 111115848A
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- purifying agent
- water purifying
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- ore powder
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention provides a nano biological compound water purifying agent and a preparation method thereof, wherein the water purifying agent is prepared by mixing a high-purity diatom natural mineral serving as a substrate with a certain amount of aluminum-containing and iron-containing mineral and special biological strains. The nano biological composite water purifying agent is added in the sewage treatment process, superfine particulate matters are adsorbed to the surface of diatom by utilizing the huge specific surface area and strong adsorption force of modified diatomite, and the flocculation of aluminum salt and ferric salt is combined to promote the rapid physical flocculation and precipitation of pollutants in water and restore the partial self-cleaning capacity of the water body; the special biological bacteria contained in the water purifying agent can consume and decompose organic pollutants in water body while quickly growing and propagating in sewage by taking diatom as a carrier. The invention has the flocculation adsorption effect of the traditional water purifying agent, provides a carrier for biological bacteria and has physical and biological effects, thereby achieving the aim of water purification.
Description
Technical Field
The invention relates to a nano biological compound water purifying agent, in particular to a nano biological compound water purifying agent and a preparation method thereof.
Background
At present, with the rapid advance of the industrialization process of China, the environmental pollution, especially the water resource pollution, is increasingly serious, and the physical health and living environment of people are seriously influenced. The coagulation treatment of industrial waste water and urban sewage by using water purifying agent is one of the most common methods in water treatment, and is also an important means for eliminating pollution and protecting environment. The traditional water purifying materials generally refer to various chemical coagulation and coagulant aids used in environmental protection treatment, and some chemical synthetic materials such as aluminum salt, iron salt, calcium salt, polyacrylamide and the like are commonly used. The water purifying agent has large single use limitation, other auxiliary substances are often required to be added during use, and the water purifying agent adopting the compounds is difficult to recycle, so that secondary pollution is caused.
The diatomite is biological silicalite consisting of diatom and siliceous remains of other microorganisms, and comprises amorphous silicon dioxide, a small amount of silicon oxide and aluminum oxide, wherein the surface of the diatomite has a special microporous structure, the size of the specific surface area directly influences the adsorption performance, and the specific surface area is in direct proportion to the adsorption capacity. A large amount of silicon hydroxyl and hydrogen bonds distributed on the surface of the diatomite dissociate to form H & lt + & gt in an aqueous solution, so that the diatomite shows certain electronegativity and has a large potential absolute value, and therefore, the diatomite has a large adsorption capacity on positively charged pollutants. At present, because the diatomite has the characteristics of stable performance, acid resistance, large pore volume, large pore diameter, large specific surface area, strong adsorbability and the like, the diatomite is used as an adsorbent, carrier preparation, sludge dehydrating agent and the like in a plurality of fields of sewage treatment. Part of the micropores on the surface of the diatomite are covered by impurities, adsorption sites are occupied, ions in the solution are prevented from entering the diatomite pore canal, and the adsorption capacity of the diatomite is limited to a certain extent.
In addition to the most common physical adsorption method, biological sewage treatment has been receiving much attention in recent years. Generally, metabolism of biological strains is utilized to assimilate organic pollutants and nitrogen and phosphorus nutrient substances, low-concentration pollutants are enriched and converted, missing components in a degraded water ecosystem structure are recovered, a good structure of a water ecosystem is rebuilt, the function recovery is realized, water quality is improved, and a polluted water body is treated.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a nano biological composite water purifying agent and a preparation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a nano biological compound water purifying agent mainly comprises the following raw materials: modified diatomite, aluminum ore powder, iron ore powder and special biological strains.
As a further illustration of the nano biological composite water purifying agent, the mass ratio of the raw materials is as follows: modified diatomite: aluminum ore powder: iron ore powder: 8-8.5 of special biological strain: 1-1.5: 0.48-0.49: 0.1-0.2.
As a further illustration of the nano biological composite water purifying agent, the mass ratio of the raw materials is preferably as follows: modified diatomite: aluminum ore powder: iron ore powder: special biological strain 8: 1.5: 0.49: 0.1.
as a further illustration of the nano biological compound water purifying agent, the special biological strain is one or two of nitrobacteria, denitrifying bacteria and phosphophagemid.
A preparation method of a nano biological compound water purifying agent comprises the following steps:
(1) roasting natural diatom mineral powder at the temperature of 450-550 ℃ for 4-10 hours, and then cooling to room temperature; mechanically grinding and sieving with 100 mesh sieve; repeatedly leaching with 1mol/L nitric acid solution for three times, leaching with deionized water to neutrality, vacuum drying at 85 deg.C for 6-8h, cooling to room temperature, mechanically grinding the obtained diatomaceous earth, and sieving with 80 mesh sieve to obtain modified diatomaceous earth;
(2) mixing the modified diatomite obtained in the step (1) with aluminum ore powder, iron ore powder and special biological strains according to the mass ratio of 8-8.5: 1-1.5: 0.48-0.49: 0.1-0.2 taking the total weight as 1kg, mixing and placing in 2000mL deionized water, fully stirring for 3-5 hours at room temperature, filtering, fully washing filter residue with deionized water, drying and mechanically grinding the filter residue at room temperature, and sieving with a 60-mesh sieve to obtain the nano biological composite water purifying agent.
As a further description of the preparation method of the nano biological compound water purifying agent, in the step (1), the diatomite is preferably roasted at 450 ℃ for 6 hours.
As a further description of the preparation method of the nano biological compound water purifying agent, in the step (3), the modified diatomite: aluminum ore powder: iron ore powder: the preferable mass fraction of the special biological strain is 8: 1.5: 0.49: 0.1.
Advantageous effects
The invention provides a nano biological compound water purifying agent which is prepared by mixing high-purity diatom natural minerals serving as a substrate with a certain amount of aluminum-containing and iron-containing minerals and special biological strains. The nano biological composite water purifying agent is added in the sewage treatment process, superfine particulate matters are adsorbed to the surface of diatom by utilizing the huge specific surface area and strong adsorption force of modified diatomite, and the flocculation of aluminum salt and ferric salt is combined to promote the rapid physical flocculation and precipitation of pollutants in water and restore the partial self-cleaning capacity of the water body; the special biological bacteria contained in the water purifying agent can consume and decompose organic pollutants in water body while quickly growing and propagating in sewage by taking diatom as a carrier. The invention has the flocculation adsorption effect of the traditional water purifying agent, provides a carrier for biological bacteria and has physical and biological effects, thereby achieving the aim of water purification.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a nano diatom composite water purifying agent comprises the following steps:
(1) roasting natural diatom mineral powder at 450 deg.c for 5 hr, and cooling to room temperature; mechanically grinding and sieving with 100 mesh sieve; repeatedly leaching with 1mol/L nitric acid solution for three times, leaching with deionized water to neutrality, vacuum drying at 85 deg.C for 6-8h, cooling to room temperature, mechanically grinding the obtained diatomaceous earth, and sieving with 80 mesh sieve to obtain modified diatomaceous earth;
(2) mixing the modified diatomite obtained in the step (1) with aluminum ore powder, iron ore powder and special biological strains according to a mass ratio of 8: 1.5: 0.49: 0.1 taking 1kg of total weight, mixing and placing in 2000mL of deionized water, fully stirring for 3-5 hours at room temperature, filtering, fully washing filter residue with deionized water, drying and mechanically grinding the filter residue at room temperature, and sieving with a 60-mesh sieve to obtain the nano biological composite water purifying agent.
Example 2
In order to screen out the optimized roasting temperature and time of the diatomite, the influence of different roasting temperature and time treatments on the specific surface area and the water purification capacity of the diatomite is explored.
First, the firing temperature and firing time were screened using an orthogonal test and the specific surface area of untreated natural diatomaceous earth was compared. 20g of natural diatomaceous earth was treated under the conditions of calcination temperature and time for each group, washed with deionized water, then vacuum-dried at 80 ℃ for 6 hours and then cooled to room temperature, and the specific surface area of each group of treated diatomaceous earth was measured. The results are shown in Table 1.
TABLE 1 Effect of different calcination temperatures and times on the specific surface area of diatomaceous Earth
The specific surface area of the untreated natural diatomaceous earth was 14.96m2(ii) in terms of/g. As can be seen from Table 1, the calcined diatomaceous earth has a significantly increased specific surface area compared to natural diatomaceous earth; under the condition of short roasting time (4 hours of roasting time), the specific surface area of the diatomite is gradually increased along with the rise of the roasting temperature, which is probably because the impurities and organic matters in the diatomite can be better treated by high temperature in a short time; under the same temperature, along with the increase of roasting time, the specific surface area of the diatomite tends to increase firstly and then decrease, which is probably because impurities and organic matters in the diatomite are well treated when the diatomite is roasted for 6 hours, and the framework of the diatomite partially collapses along with the increase of the roasting time, so that the surface area is reduced; the ratio of diatomaceous earth increases with temperature when the calcination time is 6, 8 and 10 hours respectivelyThe area shows a decreasing trend; from the above results, it is understood that the most preferable calcination temperature of the diatomaceous earth of the present invention is 450 ℃ and the calcination time is 6 hours.
Then, the COD concentration in the wastewater after the wastewater is treated by the diatomite and the natural diatomite which are treated at different roasting temperatures and time is tested, and the COD removal rate is calculated, and the result is shown in Table 2.
TABLE 2 influence of diatomaceous earth treated at different roasting temperatures and times on COD removal from wastewater
The COD concentration in the original wastewater is 800mg/L, the COD concentration after the wastewater is treated by the natural diatomite is 616mg/L, and the COD removal rate is 23.0 percent. As can be seen from the results in Table 2, the COD removal rate of the calcined diatomite is obviously increased compared with that of the natural diatomite; the COD removal rate keeps consistent with the change of the specific surface area of the diatomite along with the change of the roasting temperature and the roasting time, and the increase of the specific surface area is beneficial to improving the water purification capacity of the diatomite. From the above results, it can be seen that the most preferable calcination temperature of the diatomaceous earth of the present invention is 450 ℃ and the calcination time is 6 hours.
Example 3
On the basis of the modified diatomite, the components of the water purifying agent are screened.
A first group: modified diatomite: aluminum ore powder: iron ore powder: the special biological strain is 8: 1.5: 0.49: 0.1;
second group: modified diatomite: the special biological strain is 8: 0.1;
third group: modified diatomite: aluminum ore powder: iron ore powder is 8: 1.5: 0.49;
and a fourth group: aluminum ore powder: iron ore powder: specific biological bacteria 1.5: 0.49: 0.1;
and a fifth group: modified diatomite: aluminum ore powder: special biological bacteria 8: 1.5: 0.1;
a sixth group: modified diatomite: iron ore powder: special biological bacteria 8: 0.49: 0.1;
different water purifying agents are prepared according to the formula, the prepared water purifying agents are applied to the same batch of domestic sewage of the same sewage treatment plant, and CON, TN and TP of the sewage before and after treatment are detected, and the results are shown as follows.
From the above results, it can be confirmed that first of all, comparing the six groups of results, the modified diatomite plays a major role in sewage treatment, and the ultrafine particulate matter is adsorbed to the surface of the diatomite by using its huge specific surface area and strong adsorption force; the aluminum ore powder plays a role in flocculation, so that the modified diatomite adsorbed with impurities is better precipitated, and the water purifying capacity of the water purifying agent is improved; the iron ore powder can enhance the flocculation of the aluminum ore powder and accelerate the sedimentation speed of pollutants; the special biological strain releases phosphorus by using anaerobic reaction, absorbs a large amount of phosphorus in an aerobic section so as to improve the nitrogen and phosphorus removal capability of the water purifying agent, and simultaneously takes the modified diatom as a carrier to rapidly grow and propagate and consume and decompose organic pollutants in the polluted water body. In summary, in order to achieve an ideal water purification effect, the modified diatomite, the aluminum ore powder, the iron ore powder and the special biological strain are all indispensable.
Example 4
The nano diatom composite water purifying agent prepared in the embodiment 1 is applied to a certain sewage treatment plant: 150000 ton/day, mainly domestic sewage, the effect after using is as follows:
| measurement items | Unit of | Before treatment | After treatment | Efficiency of treatment |
| COD | mg/L | 800 | 25.6 | 96.80％ |
| Ammonia nitrogen | mg/L | 70 | 4.55 | 93.50％ |
| TN | mg/L | 120 | 10.58 | 91.18％ |
| TP | mg/L | 8 | 0.007 | 99.91％ |
| SS | mg/L | 200 | 4.81 | 97.60％ |
As can be seen from the above table, the adoption of the composite nano diatom water purifying agent of the invention to treat domestic sewage can achieve more than 91% of COD, ammonia nitrogen, total phosphorus and SS.
Claims (7)
1. The nano biological compound water purifying agent is characterized by comprising the following raw materials: modified diatomite, aluminum ore powder, iron ore powder and special biological strains.
2. The nano-biological composite water purifying agent according to claim 1, characterized in that the mass ratio of the raw materials is as follows: modified diatomite: aluminum ore powder: iron ore powder: 8-8.5 of special biological strain: 1-1.5: 0.48-0.49: 0.1-0.2.
3. The nano-biological composite water purifying agent according to claim 1, characterized in that the mass ratio of the raw materials is as follows: modified diatomite: aluminum ore powder: iron ore powder: special biological strain 8: 1.5: 0.49: 0.1.
4. the nano-biological composite water purifying agent according to claim 1, wherein the special biological species is one or two of nitrifying bacteria, denitrifying bacteria and phosphorus-feeding bacteria.
5. A preparation method of a nano biological compound water purifying agent is characterized by comprising the following steps:
(1) roasting natural diatom mineral powder at the temperature of 450-550 ℃ for 4-10 hours, and then cooling to room temperature; mechanically grinding and sieving with 100 mesh sieve; repeatedly leaching with 1mol/L nitric acid solution for three times, leaching with deionized water to neutrality, vacuum drying at 85 deg.C for 6-8h, cooling to room temperature, mechanically grinding the obtained diatomaceous earth, and sieving with 80 mesh sieve to obtain modified diatomaceous earth;
(2) mixing the modified diatomite obtained in the step (1) with aluminum ore powder, iron ore powder and special biological strains according to the mass ratio of 8-8.5: 1-1.5: 0.48-0.49: 0.1-0.2 taking the total weight as 1kg, mixing and placing in 2000mL deionized water, fully stirring for 3-5 hours at room temperature, filtering, fully washing filter residue with deionized water, drying and mechanically grinding the filter residue at room temperature, and sieving with a 60-mesh sieve to obtain the nano biological composite water purifying agent.
6. The method for preparing a nano-biological compound water purifying agent according to claim 4, wherein in the step (1), the diatomite is calcined preferably at 450 ℃ for 6 hours.
7. The method for preparing the nano-biological compound water purifying agent according to claim 4, wherein in the step (3), the ratio of the modified diatomite: aluminum ore powder: iron ore powder: the preferable mass fraction of the special biological strain is 8: 1.5: 0.49: 0.1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115650448A (en) * | 2022-02-15 | 2023-01-31 | 扬州工业职业技术学院 | Composite flocculant based on modified diatomite and application thereof |
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| CN101182512A (en) * | 2007-08-01 | 2008-05-21 | 江苏省嘉庆水务发展有限公司 | Biology diatom water treatment agent and method of producing the same |
| CN102976458A (en) * | 2011-09-02 | 2013-03-20 | 上海市政工程设计研究总院（集团）有限公司 | Compound refined diatomite sewage dephosphorization agent |
| CN109336345A (en) * | 2018-11-29 | 2019-02-15 | 福州宇澄环保工程设计有限公司 | A kind of black and odorous water bed mud biological modification agent |
-
2019
- 2019-12-31 CN CN201911420144.1A patent/CN111115848A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0217998A (en) * | 1988-07-04 | 1990-01-22 | Dia Furotsuku Kk | Method for improving settleability of activated sludge |
| CN101182512A (en) * | 2007-08-01 | 2008-05-21 | 江苏省嘉庆水务发展有限公司 | Biology diatom water treatment agent and method of producing the same |
| CN102976458A (en) * | 2011-09-02 | 2013-03-20 | 上海市政工程设计研究总院（集团）有限公司 | Compound refined diatomite sewage dephosphorization agent |
| CN109336345A (en) * | 2018-11-29 | 2019-02-15 | 福州宇澄环保工程设计有限公司 | A kind of black and odorous water bed mud biological modification agent |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115650448A (en) * | 2022-02-15 | 2023-01-31 | 扬州工业职业技术学院 | Composite flocculant based on modified diatomite and application thereof |
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