CN113023851A - Medicament capable of removing activated carbon powder in wastewater - Google Patents
Medicament capable of removing activated carbon powder in wastewater Download PDFInfo
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- CN113023851A CN113023851A CN202110312906.7A CN202110312906A CN113023851A CN 113023851 A CN113023851 A CN 113023851A CN 202110312906 A CN202110312906 A CN 202110312906A CN 113023851 A CN113023851 A CN 113023851A
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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
- C02F1/52—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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/52—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
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a medicament capable of removing activated carbon powder in wastewater, which comprises a chitosan flocculant, cellulose modified kaolin, an inorganic flocculant, modified starch and diatomite. The medicament capable of removing the activated carbon powder in the wastewater has the advantages of wide raw material source, simple synthesis method, low environmental toxicity and good removal effect on the activated carbon powder in the wastewater.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a medicament capable of removing activated carbon powder in wastewater.
Background
Activated carbon is a specially treated carbon produced by heating an organic raw material (husk, coal, wood, etc.) in the absence of air to reduce non-carbon components (this process is called carbonization), and then reacting with a gas to erode the surface and produce a structure with developed micropores (this process is called activation). The activation process is a microscopic process, i.e. the surface erosion of a large amount of molecular carbides is punctiform erosion, so that countless fine pores are formed on the surface of the activated carbon, and the activated carbon has extremely strong adsorption and purification capabilities, can effectively adsorb various organic and inorganic pollutants in gas phase and water phase environments, is widely applied to the fields of medicine, chemical industry, food, environmental protection treatment and the like, and is used for decoloring, deodorizing, purifying waste water and the like.
Although the relatively strong adsorption capacity of the activated carbon solves the problems of wastewater and waste gas treatment and the like in the industrial production process for enterprises, after the activated carbon is subjected to multiple adsorption reactions, the activity of the activated carbon is reduced due to chemical changes and structural changes generated inside the activated carbon, the specific surface area is reduced, and the adsorption capacity cannot meet the production requirements and is formed into waste activated carbon. According to the regulations of the national records of hazardous wastes, the waste activated carbon contaminated with hazardous wastes belongs to hazardous wastes. Namely, the activated carbon adsorbs toxic and harmful substances specified in the directory of hazardous wastes such as VOCs, formaldehyde, benzene-containing waste gas, heavy metals and the like, and the activated carbon belongs to hazardous wastes, so that direct discharge cannot be performed, and the activated carbon needs to be collected and treated.
At present, the recovery of the activated carbon generally adopts a filtering method, but the method has the defects of poor recovery effect on the activated carbon powder with smaller particle size, easy blockage of a filter screen and low recovery efficiency. In addition, activated carbon can be recovered in a flocculation mode in the prior art, and polyaluminium chloride (PAC) Polyacrylamide (PAM) is generally adopted for compounding in the process. In the water treatment, the effect of independently using PAC is poor, and an auxiliary agent PAM is often required to be added for coagulation assistance so as to accelerate the coagulation process and increase the density and quality of particles. When PAC and PAM are used together, the formed alumen ustum is large, the sedimentation is fast, the floccule is large and solid, the particle sedimentation rate is greatly accelerated, the treatment effect is better, and the flocculation effect on the activated carbon powder is better. However, the disadvantage of applying polyacrylamide in large quantities is that: under natural conditions, polyacrylamide undergoes slow physical degradation (heat, shear), chemical degradation (hydrolysis, oxidation and catalytic oxidation) and biological degradation, and finally generates various oligomers and neurotoxic highly toxic acrylamide monomers. Further environmental pollution may occur. Therefore, there is a need for developing a new agent for removing activated carbon powder from wastewater.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a reagent for removing activated carbon powder from wastewater, which has a wide range of raw material sources, a simple synthesis method, and low environmental toxicity, and has a good effect of removing activated carbon powder from wastewater.
In order to achieve the technical effect, the invention adopts the following technical scheme:
a medicament capable of removing activated carbon powder in wastewater comprises the following substances in parts by weight:
2-7 parts of chitosan flocculant, 14-25 parts of cellulose modified kaolin, 3-5 parts of inorganic flocculant, 0.3-2 parts of modified starch and 1-3 parts of diatomite.
Further, the medicament for removing the activated carbon powder in the wastewater consists of the following substances in parts by weight:
3-5 parts of chitosan flocculant, 18-21 parts of cellulose modified kaolin, 3.2-4.8 parts of inorganic flocculant, 0.3-1 part of modified starch and 1.3-2.6 parts of diatomite.
Further, the preparation method of the medicament for removing the activated carbon powder in the wastewater comprises the following steps:
firstly, preparing cellulose modified kaolin;
and 2-7 parts of chitosan flocculant, 3-5 parts of inorganic flocculant, 0.3-2 parts of modified starch, 1-3 parts of diatomite and 14-25 parts of cellulose modified kaolin prepared in the step I are uniformly mixed, ground together and sieved by a 20-mesh sieve, so that the preparation is finished.
Further, the preparation method of the modified kaolin comprises the following steps:
s1: grinding kaolin raw materials, heating to the temperature of 300-420 ℃, and carrying out heat preservation and calcination for 2-3h to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 15-30, adding 36% hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 0.5-2h, adding 0.3-1 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3-4 h;
s3: mixing the kaolin powder obtained in the step S1 according to the weight ratio of 4-7: adding the mass ratio of 20 into the reaction system of the step S2, and continuously stirring for 2-3h to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 2-3 times by using 95% ethanol, and drying the viscous slurry for 7-12 h at the temperature of 70-80 ℃.
Further, the particle size of the kaolin ground in the step S3 is less than 20 mm.
Further, the inorganic flocculant is PAC.
Compared with the prior art, the invention has the beneficial effects that:
in a first aspect, the agent for removing activated carbon powder from wastewater provided by the invention realizes efficient removal of activated carbon powder from wastewater by using fibers, and can be applied to a subsequent process of treating wastewater by using activated carbon to remove the residual activated carbon powder from wastewater, thereby avoiding secondary pollution to the environment caused by discharge of activated carbon after adsorbing toxic and harmful substances.
In the second aspect, the medicament capable of removing the activated carbon powder in the wastewater provided by the invention has the advantages of wide preparation source, low cost, simple processing and modification method, no toxic or harmful effect on animals and plants, capability of effectively saving wastewater treatment resources and reducing the wastewater treatment cost, and is suitable for large-area popularization and application.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Examples 1 to 7 are preparation method examples provided by the present invention:
example 1
The component ratio is as follows:
2.2 parts of chitosan flocculant, 14 parts of cellulose modified kaolin, 3 parts of PAC, 0.4 part of modified starch and 1.1 part of diatomite;
the preparation method comprises the following steps:
the preparation method of the cellulose modified kaolin comprises the following steps:
s1: grinding kaolin raw materials until the particle size is less than 20mm, putting the ground kaolin raw materials into a calcining furnace, heating to 310 ℃, and carrying out heat preservation and calcination for 3 hours to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 16, adding 36 percent hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 1.2h, adding 0.4 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3 h;
s3: mixing the kaolin powder in the step S1 according to the weight ratio of 4: adding the mass ratio of 20 into the reaction system of the step S2, and continuously stirring for 2-3h to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 3 times by using 95% ethanol, and drying the viscous slurry for 8 hours at 70-80 ℃.
Secondly, taking the chitosan flocculant, the PAC, the modified starch, the diatomite and the cellulose modified kaolin prepared in the step I according to the mass proportion of the formula amount, uniformly mixing, grinding the mixture together, and then sieving the mixture by a 20-mesh sieve to obtain the modified kaolin.
Example 2
The component ratio is as follows:
3 parts of chitosan flocculant, 18 parts of cellulose modified kaolin, 3.2 parts of PAC, 0.3 part of modified starch and 1.3 parts of diatomite;
the preparation method comprises the following steps:
the preparation method of the cellulose modified kaolin comprises the following steps:
s1: grinding kaolin raw materials until the particle size is less than 20mm, putting the ground kaolin raw materials into a calcining furnace, heating to 400 ℃, and carrying out heat preservation and calcination for 2 hours to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 20, adding 36% hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 1h, adding 0.6 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3-4 h;
s3: mixing the kaolin powder in the step S1 according to the ratio of 3: 10 is added into the reaction system of the step S2, and the stirring is continued for 2h to 3h, so as to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 2 times by using 95% ethanol, and drying the viscous slurry for 10 hours at 70-80 ℃.
Secondly, taking the chitosan flocculant, the PAC, the modified starch, the diatomite and the cellulose modified kaolin prepared in the step I according to the mass proportion of the formula amount, uniformly mixing, grinding the mixture together, and then sieving the mixture by a 20-mesh sieve to obtain the modified kaolin.
Example 3
The component ratio is as follows:
5 parts of chitosan flocculant, 21 parts of cellulose modified kaolin, 4.8 parts of PAC, 1 part of modified starch and 2.6 parts of diatomite;
the preparation method comprises the following steps:
the preparation method of the cellulose modified kaolin comprises the following steps:
s1: grinding kaolin raw materials until the particle size is less than 20mm, putting the ground kaolin raw materials into a calcining furnace, heating to 420 ℃, and carrying out heat preservation and calcination for 2.5 hours to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 30, adding 36% hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 2h, adding 1 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3-4 h;
s3: the kaolin powder in step S1 was mixed according to the ratio of 7: adding the mass ratio of 20 into the reaction system of the step S2, and continuously stirring for 2-3h to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 2-3 times by using 95% ethanol, and drying the viscous slurry for 7-12 h at the temperature of 70-80 ℃.
Secondly, taking the chitosan flocculant, the PAC, the modified starch, the diatomite and the cellulose modified kaolin prepared in the step I according to the mass proportion of the formula amount, uniformly mixing, grinding the mixture together, and then sieving the mixture by a 20-mesh sieve to obtain the modified kaolin.
Example 4
The component ratio is as follows:
2-7 parts of chitosan flocculant, 14-25 parts of cellulose modified kaolin, 0.3-2 parts of PAC3-5 parts of modified starch and 1-3 parts of diatomite
The preparation method comprises the following steps:
the preparation method of the cellulose modified kaolin comprises the following steps:
s1: grinding kaolin raw materials until the particle size is less than 20mm, putting the ground kaolin raw materials into a calcining furnace, heating to 300 ℃, and carrying out heat preservation and calcination for 3 hours to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 30, adding 36 percent hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 0.5h, adding 0.7 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3-4 h;
s3: mixing the kaolin powder obtained in the step S1 according to the weight ratio of 4-7: adding the mass ratio of 20 into the reaction system of the step S2, and continuously stirring for 2-3h to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 2-3 times by using 95% ethanol, and drying the viscous slurry for 7-12 h at the temperature of 70-80 ℃.
Secondly, taking the chitosan flocculant, the PAC, the modified starch, the diatomite and the cellulose modified kaolin prepared in the step I according to the mass proportion of the formula amount, uniformly mixing, grinding the mixture together, and then sieving the mixture by a 20-mesh sieve to obtain the modified kaolin.
Example 5
The component ratio is as follows:
5 parts of chitosan flocculant, 4.8 parts of PAC (polyaluminium chloride), 1 part of modified starch and 2.6 parts of diatomite;
the preparation method comprises the following steps:
the preparation method comprises the following steps of uniformly mixing the chitosan flocculant, the PAC, the modified starch and the diatomite according to the mass ratio of the formula amount, grinding the mixture together, and then sieving the mixture by a 20-mesh sieve to obtain the chitosan flocculant.
Example 6
The component ratio is as follows:
5 parts of chitosan flocculant, 21 parts of cellulose modified kaolin, 1 part of modified starch and 2.6 parts of diatomite;
the preparation method comprises the following steps:
the preparation method of the cellulose modified kaolin comprises the following steps:
s1: grinding kaolin raw materials until the particle size is less than 20mm, putting the ground kaolin raw materials into a calcining furnace, heating to 420 ℃, and carrying out heat preservation and calcination for 2.5 hours to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 30, adding 36% hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 2h, adding 1 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3-4 h;
s3: the kaolin powder in step S1 was mixed according to the ratio of 7: adding the mass ratio of 20 into the reaction system of the step S2, and continuously stirring for 2-3h to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 2-3 times by using 95% ethanol, and drying the viscous slurry for 7-12 h at the temperature of 70-80 ℃.
Secondly, taking the chitosan flocculant, the modified starch, the diatomite and the cellulose modified kaolin prepared in the step I according to the mass proportion of the formula amount, uniformly mixing, grinding the mixture together, and then sieving the mixture by a 20-mesh sieve to obtain the modified kaolin.
Example 7
The component ratio is as follows:
21 parts of cellulose modified kaolin, 4.8 parts of PAC (polyaluminium chloride), 1 part of modified starch and 2.6 parts of diatomite;
the preparation method comprises the following steps:
the preparation method of the cellulose modified kaolin comprises the following steps:
s1: grinding kaolin raw materials until the particle size is less than 20mm, putting the ground kaolin raw materials into a calcining furnace, heating to 420 ℃, and carrying out heat preservation and calcination for 2.5 hours to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 30, adding 36% hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 2h, adding 1 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3-4 h;
s3: the kaolin powder in step S1 was mixed according to the ratio of 7: adding the mass ratio of 20 into the reaction system of the step S2, and continuously stirring for 2-3h to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 2-3 times by using 95% ethanol, and drying the viscous slurry for 7-12 h at the temperature of 70-80 ℃.
And secondly, taking PAC, modified starch, diatomite and the cellulose modified kaolin prepared in the step I according to the mass proportion of the formula, uniformly mixing, grinding the mixture together, and sieving the mixture by a 20-mesh sieve to obtain the modified kaolin.
Example 8 is an effect test example of the present invention
Example 8
Comprising the following operating steps ABC, wherein:
a: adding 50g of activated carbon powder into 10000ml of ultrapure water, continuously stirring for 0.5h to uniformly disperse the activated carbon powder in the ultrapure water, and filtering by using filter paper to obtain a solution to be detected, wherein the activated carbon powder is dried and sieved by a 400-mesh sieve;
b: taking 200ml of the liquid to be detected prepared in the step as a sample to be detected under the condition of continuous stirring, taking 21 parts of the sample, respectively numbering the 21 parts of the sample as 1, 2, 3.. 20 and 21, and respectively dividing the sample into seven groups according to the numbers;
c: before treatment, the absorption value of each sample is measured for the first time by adopting a spectrophotometry method, then a certain amount of the medicament prepared in the embodiment 1-the embodiment 7 is added into each sample to be measured, the mixture is stirred for 10min and then filtered and precipitated by adopting filter paper, the supernatant obtained after filtration is measured for the second time by adopting a spectrophotometer, the sedimentation rate of the activated carbon is calculated, and the experimental results are shown in the table 1:
table 1: EXAMPLES 1-7 flocculation Effect of the preparations obtained in example 7 on activated carbon powder
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (6)
1. The medicament capable of removing the activated carbon powder in the wastewater is characterized by comprising the following substances in parts by weight:
2-7 parts of chitosan flocculant, 14-25 parts of cellulose modified kaolin, 3-5 parts of inorganic flocculant, 0.3-2 parts of modified starch and 1-3 parts of diatomite.
2. The agent capable of removing the activated carbon powder in the wastewater as claimed in claim 1, which is characterized by comprising the following components in parts by weight:
3-5 parts of chitosan flocculant, 18-21 parts of cellulose modified kaolin, 3.2-4.8 parts of inorganic flocculant, 0.3-1 part of modified starch and 1.3-2.6 parts of diatomite.
3. The agent for removing activated carbon powder from wastewater as claimed in claim 1, wherein the preparation method comprises the following steps:
firstly, preparing cellulose modified kaolin;
and 2-7 parts of chitosan flocculant, 3-5 parts of inorganic flocculant, 0.3-2 parts of modified starch, 1-3 parts of diatomite and 14-25 parts of cellulose modified kaolin prepared in the step I are uniformly mixed, ground together and sieved by a 20-mesh sieve, so that the preparation is finished.
4. The agent for removing activated carbon powder from wastewater as claimed in claim 1, wherein the preparation method of the modified kaolin comprises the following steps:
s1: grinding kaolin raw materials, heating to the temperature of 300-420 ℃, and carrying out heat preservation and calcination for 2-3h to obtain kaolin powder;
s2: taking cellulose and a 95% ethanol solution according to the mass ratio of 1: 15-30, adding 36% hydrochloric acid solution to adjust the pH value to 9-10, acidifying at 55-60 ℃ for 0.5-2h, adding 0.3-1 part of ferrous sulfate into the reaction system at the temperature, and continuously stirring for 3-4 h;
s3: mixing the kaolin powder obtained in the step S1 according to the weight ratio of 4-7: adding the mass ratio of 20 into the reaction system of the step S2, and continuously stirring for 2-3h to obtain viscous slurry;
s4: and (4) carrying out suction filtration on the viscous slurry obtained in the step S3, washing the viscous slurry for 2-3 times by using 95% ethanol, and drying the viscous slurry for 5-12 h at the temperature of 70-80 ℃.
5. The agent for removing activated carbon powder from wastewater as claimed in claim 4, wherein: the milled particle size of the kaolin in the step S3 is less than 20 mm.
6. The agent for removing activated carbon powder from wastewater as claimed in claim 1, wherein: the inorganic flocculant is PAC.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974320A (en) * | 2012-12-18 | 2013-03-20 | 合肥工业大学 | Method for preparing organic modified attapulgite adsorbent |
| CN105617981A (en) * | 2016-01-30 | 2016-06-01 | 湘潭大学 | Sepiolite modification method and application of modified sepiolite to wastewater treatment |
| CN108862506A (en) * | 2018-06-22 | 2018-11-23 | 陕西汉邦生物环保科技有限公司 | It is a kind of for handling the composite flocculation agent of desulfurization wastewater |
| CN111573798A (en) * | 2020-04-30 | 2020-08-25 | 广西夏阳环保科技有限公司 | Natural composite polyaluminum chloride water treatment agent and preparation method thereof |
-
2021
- 2021-03-24 CN CN202110312906.7A patent/CN113023851A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974320A (en) * | 2012-12-18 | 2013-03-20 | 合肥工业大学 | Method for preparing organic modified attapulgite adsorbent |
| CN105617981A (en) * | 2016-01-30 | 2016-06-01 | 湘潭大学 | Sepiolite modification method and application of modified sepiolite to wastewater treatment |
| CN108862506A (en) * | 2018-06-22 | 2018-11-23 | 陕西汉邦生物环保科技有限公司 | It is a kind of for handling the composite flocculation agent of desulfurization wastewater |
| CN111573798A (en) * | 2020-04-30 | 2020-08-25 | 广西夏阳环保科技有限公司 | Natural composite polyaluminum chloride water treatment agent and preparation method thereof |
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