CN115650448A - Composite flocculant based on modified diatomite and application thereof - Google Patents

Composite flocculant based on modified diatomite and application thereof Download PDF

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Publication number
CN115650448A
CN115650448A CN202210151188.4A CN202210151188A CN115650448A CN 115650448 A CN115650448 A CN 115650448A CN 202210151188 A CN202210151188 A CN 202210151188A CN 115650448 A CN115650448 A CN 115650448A
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powder
diatomite
modified diatomite
composite flocculant
modified
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CN202210151188.4A
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CN115650448B (en
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杨瑞洪
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Hebei Haoqing Environmental Protection Technology Co ltd
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Yangzhou Polytechnic Institute
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

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  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The scheme relates to a composite flocculant based on modified diatomite, which comprises 20-40 parts of modified diatomite, 10-15 parts of an inorganic flocculant and 0.1-0.5 part of a microbial community; the modified diatomite is treated by sodium hydroxide, treated by polyethylene glycol and then coated by aluminum, and finally coated by polyethylene diamine. The surface of the diatomite is modified, so that the aperture and the pore volume of the diatomite can be effectively increased; metal ions in the water body can be effectively removed; impurities such as nitrogen and phosphorus in the water body can be effectively adsorbed; the service life is prolonged, the adsorption sites are increased, and the water-based organic compound adsorbent has certain adsorbability to organic matters in water; the adsorption effect of the modified diatomite is used for gathering impurity pollutants in the water body, and the inorganic flocculant and the microbial flora assist in flocculating, precipitating and degrading the pollution in the water body, so that metal ions and organic matters in the wastewater are effectively reduced.

Description

Composite flocculant based on modified diatomite and application thereof
Technical Field
The invention relates to the field of water treatment, in particular to a composite flocculant based on modified diatomite and application thereof.
Background
Water is one of the most important natural resources on which humans rely for survival, and is also an indispensable resource for all ecosystems. Although China has wide breadth and numerous rivers and seas, the water resource occupied by people in China is very low. Particularly, with the rapid development of economy, a large amount of domestic sewage, industrial wastewater, agricultural wastewater and the like seriously pollute the water environment and further influence the life safety of animals, plants and human beings. In the face of increasingly stringent environmental standards and requirements, and in order to reduce the energy and resource requirements required in the sewage treatment process and reduce the potential risk of secondary pollution, a novel efficient water treatment process and a water treatment agent must be developed.
The common sewage treatment methods include: ion exchange, precipitation, suspension, adsorption, flocculation, biological methods, etc. The flocculation method is a simple and efficient wastewater treatment method, and is generally used in industry in combination with biological methods and adsorption methods, because various solutes, suspended particles or colloids in an aqueous solution can be destabilized and aggregated by a flocculant to form floccules, so that the floccules are accelerated to settle.
Most commercial organic synthetic flocculants are based on petroleum and are made by chemical processing and are non-renewable resources. At present, people turn to search natural resources in nature to replace organic synthetic flocculants.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the composite flocculant which is prepared by combining the inorganic flocculant and the biological flora based on natural resources, namely the diatomite, and has better flocculation effect compared with the traditional flocculant.
In order to achieve the purpose, the invention provides the following technical scheme:
a composite flocculant based on modified diatomite comprises 20-40 parts of modified diatomite, 10-15 parts of inorganic flocculant and 0.1-0.5 part of microbial flora; the preparation process of the modified diatomite comprises the following steps:
1) Weighing a certain amount of diatomite in an erlenmeyer flask, adding a sodium hydroxide solution, and oscillating for 2-3 hours at a constant temperature of 40 ℃; after finishing, filtering, washing with water to be neutral, drying, and calcining at 350-400 ℃ for 2-3 h to obtain powder;
2) After the powder is cooled, putting the powder into a water solution of polyethylene glycol, carrying out ultrasonic oscillation to uniformly disperse the powder, heating the powder to 60 ℃, adding sodium metaaluminate into the powder, wherein the using amount of the sodium metaaluminate is 1.5-2.5 percent of the mass of the powder, and stirring the powder for 1 hour at constant temperature to obtain slurry;
3) Adding polyethylene diamine into the slurry, heating to 80-90 ℃, and stirring for 1-2 h; and cooling to room temperature, performing solid-liquid separation, drying the solid, and grinding to obtain the modified diatomite.
Preferably, the concentration of the sodium hydroxide solution is 10M, and the volume mass ratio of the sodium hydroxide solution to the diatomite is 4 ml.
Preferably, the mass of the polyethylene glycol in the step 2) is 1-1.5% of the mass of the powder.
Preferably, the dosage of the polyethylene diamine is 70-100% of the mass of the powder.
Preferably, the inorganic flocculant is one or more of polyaluminium sulfate, polyaluminium silicate, ferric chloride and polyaluminium chloride.
Preferably, the microbial flora is at least two of yeast, lactic acid bacteria, bacillus subtilis and nitrobacteria.
Preferably, the composite flocculant further comprises 1-3 parts of a coagulant aid, and the coagulant aid is polyacrylamide or chitosan.
Compared with the prior art, the invention has the beneficial effects that:
the diatomite has a porous structure and a larger specific surface area, and the method firstly adopts sodium hydroxide to treat the diatomite, so that the pore diameter of the diatomite can be effectively increased; after calcination, further removing impurities and increasing the pore volume; the steric hindrance is increased by adding the polyethylene glycol, so that the contact area is increased when the polyethylene glycol is mixed with sodium metaaluminate, and metal ions in a water body can be effectively removed; the modified diatomite is coated by aluminum, and the aluminum is positively charged, so that the surface of the modified diatomite is electrically changed, and impurities such as nitrogen, phosphorus and the like in a water body can be effectively adsorbed; finally, the addition of the polyethylene diamine forms a protective layer on the surface of the diatomite, so that the service life is prolonged, adsorption sites are increased, and the diatomite surface water treatment agent has certain adsorbability on organic matters in water.
The adsorption effect of the modified diatomite is used for gathering impurity pollutants in the water body, and the flocculation, precipitation and degradation of the pollutants in the water body are assisted by the inorganic flocculant and the microbial flora, so that metal ions and organic matters in the wastewater are effectively reduced.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
a composite flocculant based on modified diatomite comprises 20 parts of modified diatomite, 10 parts of inorganic flocculant (polyaluminium sulfate and polyaluminium silicate 1:1) and 0.1 part of microbial community; the preparation process of the modified diatomite comprises the following steps:
1) Weighing a certain amount of diatomite in a conical flask, adding 10M sodium hydroxide solution according to the mass volume ratio of 1g to 4ml, and oscillating at constant temperature of 40 ℃ for 2-3 h; after finishing, filtering, washing with water to be neutral, drying, and calcining at 350-400 ℃ for 2-3 h to obtain powder;
2) After the powder is cooled, putting the powder into a polyethylene glycol aqueous solution containing 1% of the powder by mass, carrying out ultrasonic oscillation to uniformly disperse the powder, heating the powder to 60 ℃, adding sodium metaaluminate into the powder, wherein the using amount of the sodium metaaluminate is 1.8% of the powder by mass, and stirring the powder for 1 hour at constant temperature to obtain slurry;
3) Adding 70% of polyethylene diamine based on the mass of the powder into the slurry, heating to 80-90 ℃, and stirring for 1-2 h; and cooling to room temperature, carrying out solid-liquid separation, drying the solid, and grinding to obtain the modified diatomite.
Example 2:
a modified diatomite-based composite flocculant comprising 30 parts of modified diatomite, 12 parts of an inorganic flocculant (polymeric ferric silicate, ferric chloride and polyaluminium chloride 1; the preparation process of the modified diatomite comprises the following steps:
1) Weighing a certain amount of diatomite in a conical flask, adding 10M sodium hydroxide solution according to the mass volume ratio of 1g to 4ml, and oscillating at constant temperature of 40 ℃ for 2-3 h; after finishing, filtering, washing with water to be neutral, drying, and calcining at 350-400 ℃ for 2-3 h to obtain powder;
2) After the powder is cooled, putting the powder into a polyethylene glycol aqueous solution containing 1.2% of the powder by mass, carrying out ultrasonic oscillation to uniformly disperse the powder, heating the powder to 60 ℃, adding sodium metaaluminate into the powder, wherein the using amount of the sodium metaaluminate is 1.8% of the powder by mass, and stirring the powder for 1 hour at constant temperature to obtain slurry;
3) Adding polyethylene diamine accounting for 80% of the mass of the powder into the slurry, heating to 80-90 ℃, and stirring for 1-2 hours; and cooling to room temperature, carrying out solid-liquid separation, drying the solid, and grinding to obtain the modified diatomite.
Example 3:
a modified diatomaceous earth-based composite flocculant comprising 40 parts of modified diatomaceous earth, 15 parts of an inorganic flocculant (polyaluminum silicate, and polyaluminum chloride 2; the preparation process of the modified diatomite comprises the following steps:
1) Weighing a certain amount of diatomite in a conical flask, adding 10M sodium hydroxide solution according to the mass volume ratio of 1g to 4ml, and oscillating at constant temperature of 40 ℃ for 2-3 h; after finishing, filtering, washing with water to be neutral, drying, and calcining at 350-400 ℃ for 2-3 h to obtain powder;
2) After the powder is cooled, putting the powder into a polyethylene glycol aqueous solution containing 1.5% of the powder by mass, carrying out ultrasonic oscillation to uniformly disperse the powder, heating the powder to 60 ℃, adding sodium metaaluminate into the powder, wherein the using amount of the sodium metaaluminate is 2.5% of the powder by mass, and stirring the powder for 1 hour at constant temperature to obtain slurry;
3) Adding 100% of polyethylene diamine based on the mass of the powder into the slurry, heating to 80-90 ℃, and stirring for 1-2 h; and cooling to room temperature, carrying out solid-liquid separation, drying the solid, and grinding to obtain the modified diatomite.
Comparative example 1:
the difference from example 3 is the preparation of modified diatomaceous earth, which is obtained by directly performing solid-liquid separation on the slurry after step 2), drying the solid and grinding the solid.
Comparative example 2:
the same as example 3, except that the modified diatomaceous earth was replaced with an equal amount of unmodified diatomaceous earth.
Comparative example 3:
the modified diatomaceous earth was removed, and the remaining components were the same as in example 3.
Product effectiveness testing
The simulated wastewater was treated with the composite flocculants prepared in examples 1-3 and comparative examples 1-3.
The composition of the simulated wastewater is shown in table 1:
TABLE 1
Composition (A) Fe 2+ Zn 2+ Cd 2+ Ammonia nitrogen Total phosphorus COD
Concentration mg/L 90 80 60 70 100 300
50mg of composite flocculant is added into 1L of simulated wastewater, the mixture is stirred and mixed evenly, the mixture is kept still for one day, and the removal rate of ions and COD in the wastewater is detected, and the results are shown in Table 2.
TABLE 2
Fe 2+ /% Zn 2+ /% Cd 2+ /% Ammonia nitrogen/%) Total phosphorus/% COD/%
Example 1 88.5 90.1 87.2 94.1 94.5 92.5
Example 2 89.1 90.5 88.1 95.8 95.1 93.8
Example 3 89.9 91.6 88.8 97.2 96.6 95.1
Comparative example 1 72.6 70.3 65.3 82.5 82.2 80.1
Comparative example 2 69.5 66.5 60.2 81.5 82.0 82.1
Comparative example 3 65.1 60.3 58.7 75.3 70.1 76.4
From the above table, the composite flocculant based on modified diatomite has good removal effect on heavy metal ions, ammonia nitrogen, total phosphorus and organic matters.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.

Claims (8)

1. The composite flocculant based on the modified diatomite is characterized by comprising 20-40 parts of the modified diatomite, 10-15 parts of an inorganic flocculant and 0.1-0.5 part of a microbial community; the preparation process of the modified diatomite comprises the following steps:
1) Weighing a certain amount of diatomite in an erlenmeyer flask, adding a sodium hydroxide solution, and oscillating for 2-3 hours at a constant temperature of 40 ℃; after finishing, filtering, washing with water to be neutral, drying, and calcining at 350-400 ℃ for 2-3 h to obtain powder;
2) After the powder is cooled, putting the powder into a water solution of polyethylene glycol, carrying out ultrasonic oscillation to uniformly disperse the powder, heating the powder to 60 ℃, adding sodium metaaluminate into the powder, wherein the using amount of the sodium metaaluminate is 1.5-2.5 percent of the mass of the powder, and stirring the powder for 1 hour at constant temperature to obtain slurry;
3) Adding polyethylene diamine into the slurry, heating to 80-90 ℃, and stirring for 1-2 h; and cooling to room temperature, performing solid-liquid separation, drying the solid, and grinding to obtain the modified diatomite.
2. The modified diatomite-based composite flocculant according to claim 1, wherein the concentration of the sodium hydroxide solution is 10M, and the volume mass ratio of the sodium hydroxide solution to the diatomite is 4 ml.
3. The modified diatomite-based composite flocculant according to claim 1, wherein the mass of the polyethylene glycol in the step 2) is 1-1.5% of the mass of the powder.
4. The modified diatomite-based composite flocculant according to claim 1, wherein the amount of the polyethylene diamine is 70-100% of the mass of the powder.
5. The modified diatomite-based composite flocculant of claim 1, wherein the inorganic flocculant is one or more of polyaluminum sulfate, polyaluminum silicate, polyaluminum ferric silicate, ferric chloride and polyaluminum chloride.
6. The modified diatomite-based composite flocculant of claim 1, wherein the microbial flora is at least two of yeast, lactic acid bacteria, bacillus subtilis and nitrifying bacteria.
7. The modified diatomite-based composite flocculant of claim 1, wherein the composite flocculant further comprises 1-3 parts of a coagulant aid, and the coagulant aid is polyacrylamide or chitosan.
8. Use of the modified diatomite-based composite flocculant according to any one of claims 1-7 for simultaneously removing heavy metal ions and organic pollutants in wastewater.
CN202210151188.4A 2022-02-15 2022-02-15 Composite flocculant based on modified diatomite and application thereof Active CN115650448B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116789331A (en) * 2023-08-22 2023-09-22 青岛中润设备仪表有限公司 Sea water desalination process

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CN107827246A (en) * 2017-11-07 2018-03-23 浙江师范大学 A kind of Combined Treatment agent for sanitary sewage disposal
CN109231463A (en) * 2018-09-12 2019-01-18 潘钕 A kind of preparation and application of compound diatomite sewage-treating agent
CN111039344A (en) * 2019-12-31 2020-04-21 江苏成博环保科技有限公司 Nano diatom composite water purifying agent and preparation method thereof
CN111115848A (en) * 2019-12-31 2020-05-08 新疆本益科技有限公司 Nano biological composite water purifying agent and preparation method thereof

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Publication number Priority date Publication date Assignee Title
WO2009150368A1 (en) * 2008-05-19 2009-12-17 Olmix Novel composite materials, method for preparing same and uses thereof
CN101898821A (en) * 2010-04-20 2010-12-01 南京农业大学 Bio-diatomite composite flocculant
US20120157623A1 (en) * 2010-12-15 2012-06-21 The Procter & Gamble Company Water-Absorbent Surface-Modified-Clay Linked Polymers
CN105130011A (en) * 2015-09-07 2015-12-09 深圳市德庆科技有限公司 Diatomite sewage treating agent, preparation method and technology application thereof
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116789331A (en) * 2023-08-22 2023-09-22 青岛中润设备仪表有限公司 Sea water desalination process
CN116789331B (en) * 2023-08-22 2023-11-10 青岛中润设备仪表有限公司 Sea water desalination process

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Effective date of registration: 20231110

Address after: 061104 Linjin Industrial Park, Qijiawu Township, Huanghua City, Cangzhou City, Hebei Province

Patentee after: Hebei Haoqing Environmental Protection Technology Co.,Ltd.

Address before: Yangzhou Vocational and Technical College of industry, Chahe street, Hanjiang District, Yangzhou City, Jiangsu Province

Patentee before: YANGZHOU POLYTECHNIC INSTITUTE

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