CN110937671A - Preparation method of coagulant with oxidation performance - Google Patents

Preparation method of coagulant with oxidation performance Download PDF

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Publication number
CN110937671A
CN110937671A CN201911210359.0A CN201911210359A CN110937671A CN 110937671 A CN110937671 A CN 110937671A CN 201911210359 A CN201911210359 A CN 201911210359A CN 110937671 A CN110937671 A CN 110937671A
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coagulant
solution
water
coagulation
preparing
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虞红波
徐绪筝
武仁超
杨鹏
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Beijing Qingyuan Water Water Treatment Technology Co Ltd
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Beijing Qingyuan Water Water Treatment Technology Co Ltd
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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
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation

Abstract

The invention discloses a preparation method of a coagulant with oxidation performance, and relates to the technical field of water treatment. The preparation method of the coagulant with the oxidation performance has the advantages that two coagulants are adopted, the coagulation effect on low-turbidity organic matter polluted sewage and raw water is good, the removal rate of humic acid is greatly improved compared with that of a conventional coagulant and a coagulation process, oxidation reaction is carried out in situ in the coagulation process by adopting nano iron, the removal efficiency of organic matters is improved, floc particles formed in the coagulation process are large in quality, magnetic and good in precipitation effect, can be rapidly precipitated in a subsequent precipitation tank, the dosage of the coagulant is low, medicaments are saved, simultaneously bottom mud has recoverability, the influence of the coagulation process on the alkalinity, the pH value and the like of water is small, the preparation method is suitable for treating various sewage and waste water and surface water, the applicability is strong, the application range is wide, and the problems of low coagulation efficiency and poor purification effect when the existing coagulation method is used for treating low-turbidity organic polluted water are well solved.

Description

Preparation method of coagulant with oxidation performance
Technical Field
The invention relates to the technical field of water treatment, in particular to a preparation method of a coagulant with oxidation performance.
Background
Coagulation is an important method for removing pollution and improving water quality in most of current water plants and sewage treatment plants, and the coagulation effect has a far-reaching influence on downstream processes such as precipitation, filtration, disinfection, membrane treatment and even biological treatment.
The soluble organic matter (DOC) is widely existed in various water bodies, the higher the content of the DOC, the worse the sanitary condition of water quality is, the organic matter has the functions of ion exchange, peptization, condensation, adsorption, chelation and the like, and has very important significance for the balance of the water body environment.
Organic matter coagulation is a most important water treatment problem after water-borne diseases and low-temperature coagulation, the research on the coagulation mechanism of organic matters has been well-known, researchers and related workers do a great deal of work on coagulants, coagulation methods, raw water conditions and the like, but the problem of organic matter coagulation is still not well solved, and the problem of water quality safety caused by the problem is not ignored.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of a coagulant with oxidation performance, and solves the problems of low coagulation efficiency and poor purification effect when the existing coagulation method is used for treating a water body polluted by low-turbidity organic matters.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a preparation method of a coagulant with oxidation performance comprises the following steps:
s1 AlCl with the preparation concentration of 0.2mol/L3A solution;
s2, preparing 0.4mol/L NaOH solution, and then adding the prepared NaOH solution into the AlCl prepared in the step S13In solution to make [ OH+]And [ Al3+]The molar ratio is 1.8: 1-2.2: 1, thus obtaining a polyaluminium chloride solution, and standing and curing for 24 hours;
s3, firstly preparing a ferrous sulfate solution with the concentration of 0.025mol/L and a potassium borohydride solution with the concentration of 0.1mol/L, and then adding the prepared potassium borohydride solution into the ferrous sulfate solution under the protection of nitrogen, so that the ferrous sulfate solution and the potassium borohydride solution are mixed to form a mixture
Figure BDA0002297920550000021
And [ Fe ]2+]The molar ratio of the compound to the compound is 4:1, then the generated solid sample is washed by ultrapure water until the pH value of the washing liquid is stable, and the solid sample is dried to obtain a solid C;
s4, adding the solid C obtained in the step S3 into the solution to ensure that [ Al3+]And [ Fe ]]The molar ratio of the coagulant to the coagulant is 1: 1-1: 15, and the mixture is vibrated for 2 hours to obtain a coagulant D;
and S5, adding the coagulant D obtained in the step S4 into the water body to be treated, quickly stirring for 2min, then slowly stirring and flocculating for 10-15 min, and precipitating for 15-20 min to finish the coagulation treatment of the low-turbidity water.
Preferably, the water to be treated in the step S5 is a water polluted by low-turbidity organic matters of 0 to 20NTU, and the DOC content in the water is 200 to 500 mg/L.
Preferably, the stirring speed gradient G of the rapid stirring in the step S5 is 140-250S-1And the stirring speed gradient G of the slow stirring is 40-100 s-1。
Preferably, a magnetic shaking stirrer with a model number of EVR-034 is used for the shaking operation in step S4.
(III) advantageous effects
The invention provides a preparation method of a coagulant with oxidation performance. Compared with the prior art, the method has the following beneficial effects:
(1) according to the preparation method of the coagulant with the oxidation performance, two coagulants are adopted, the coagulation effect on sewage and raw water polluted by low turbidity (0-20 NTU) organic matters (DOC content is 200-500 mg/L) is good, and the removal rate of humic acid is greatly improved compared with that of a conventional coagulant and a coagulation process.
(2) According to the preparation method of the coagulant with oxidation property, the nano iron is adopted, so that the oxidation reaction is generated in situ in the coagulation process, and the organic matter removal efficiency is improved.
(3) The floccule particles formed in the coagulation process are large in mass, magnetic and good in precipitation effect, and can be rapidly precipitated in a subsequent precipitation tank.
(4) The preparation method of the coagulant with oxidation performance has the advantages of low coagulant dosage, medicament saving and recyclability of the bottom mud.
(5) The preparation method of the coagulant with oxidation property has small influence on the alkalinity, the pH value and the like of water in the coagulation process.
(6) The preparation method of the coagulant with oxidation property is suitable for treating various sewage and wastewater and surface water, and has strong applicability and wide application range.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1, a method for preparing a coagulant with oxidation property specifically includes the following steps:
s1 AlCl with the preparation concentration of 0.2mol/L3A solution;
s2, preparing 0.4mol/L NaOH solution, and then adding the prepared NaOH solution into the AlCl prepared in the step S13In solution to make [ OH+]And [ Al3+]The molar ratio is 1.8: 1-2.2: 1, thus obtaining a polyaluminium chloride solution, standing and curing the polyaluminium chloride solution 24h；
S3, firstly preparing a ferrous sulfate solution with the concentration of 0.025mol/L and a potassium borohydride solution with the concentration of 0.1mol/L, and then adding the prepared potassium borohydride solution into the ferrous sulfate solution under the protection of nitrogen, so that the ferrous sulfate solution and the potassium borohydride solution are mixed to form a mixture
Figure BDA0002297920550000031
And [ Fe ]2+]The molar ratio of the compound to the compound is 4:1, then the generated solid sample is washed by ultrapure water until the pH value of the washing liquid is stable, and the solid sample is dried to obtain a solid C;
s4, adding the solid C obtained in the step S3 into the solution to ensure that [ Al3+]And [ Fe ]]The molar ratio of the mixed solution to the coagulant is 1: 1-1: 15, and the mixed solution is vibrated for 2 hours to obtain a coagulant D, wherein a magnetic vibration stirrer with the model of EVR-034 is adopted for vibration operation;
s5, adding the coagulant D obtained in the step S4 into the water body to be treated, quickly stirring for 2min, slowly stirring and flocculating for 10-15 min, and precipitating for 15-20 min to finish the coagulation treatment of the low-turbidity water, wherein the water body to be treated is a water body polluted by low-turbidity organic matters with 0-20 NTU, the DOC content in the water body is 200-500 mg/L, and the stirring speed gradient G of quick stirring is 140-250S-1And the stirring speed gradient G of the slow stirring is 40-100 s-1。
The embodiment of the invention provides three technical schemes: a preparation method of a coagulant with oxidation performance specifically comprises the following embodiments:
example 1
S1 AlCl with the preparation concentration of 0.2mol/L3A solution;
s2, preparing 0.4mol/L NaOH solution, adding the NaOH solution into the AlCl3In solution to make [ OH+]And [ Al3+]The molar ratio is 1.8:1 to obtain a polyaluminium chloride solution, and standing and curing are carried out for 24 hours;
s3, preparing a ferrous sulfate solution with the concentration of 0.025mol/L and a potassium borohydride solution with the concentration of 0.1mol/L, and adding the potassium borohydride solution into the ferrous sulfate solution under the protection of nitrogen to ensure that
Figure BDA0002297920550000041
And [ Fe ]2+]Was washed with ultrapure water until the pH of the washing solution became stable, and was dried. Obtaining solid C;
s4, adding the solid C into the solution to obtain [ Al3+]And [ Fe ]]The molar ratio of the coagulant to the coagulant is 1:1, and the mixture is vibrated for 2 hours to obtain a coagulant D;
s5, taking a certain surface water body of the local place as raw water to be treated, adding the coagulant D obtained in the step S6 into the raw water, quickly stirring the mixture for 2min, and then taking G40S as a raw material-1The raw water is stirred and flocculated at a low speed for 5-10 min in a gradient manner, and is precipitated for 15-20 min, so that the coagulation treatment of the raw water is completed.
At the same time, commercial PAC was used as a reference coagulant, which was added to raw water to be treated in the same conditions at one time in an amount of 1mmol/L (in terms of aluminum) as G40s-1Stirring at a gradient of stirring speed of (2) for 2min, G40s-1The stirring speed gradient is adopted, the flocculation is carried out by slow stirring for 15min, and the sedimentation is carried out for 15 min;
the results of comparing the indices of untreated raw water, water treated according to the method of the present invention and water treated with the single solution B are shown in Table 1.
Table 1 table of experimental results of example 1
Item Turbidity NTU DOC mg/L pH value
Raw water before treatment 10～13 330～421 7.3～7.7
Commercial PAC settled water 1.5～3.8 138～174 6.7～6.9
The method is used to treat water after precipitation 0.9～2.1 92～116 6.8～7.0
As can be seen from Table 1, compared with the conventional PAC coagulation method sold in the market, the indexes of the settled water are better than those of the conventional coagulation method, particularly shown in DOC control, and organic matter control is the most key index of coagulation treatment.
Example 2
S1 AlCl with the preparation concentration of 0.2mol/L3A solution;
s2, preparing 0.4mol/L NaOH solution, adding the NaOH solution into the AlCl3In solution to make [ OH+]And [ Al3+]The molar ratio is 2:1 to obtain a polyaluminium chloride solution, and standing and curing are carried out for 24 hours;
s3, preparing a ferrous sulfate solution with the concentration of 0.025mol/L and a potassium borohydride solution with the concentration of 0.1mol/L, and adding the potassium borohydride solution into the ferrous sulfate solution under the protection of nitrogen to ensure that
Figure BDA0002297920550000051
And [ Fe ]2+]Was washed with ultrapure water until the pH of the washing solution became stable, and was dried. Obtaining solid C;
s4, adding the solid C into the solution to obtain [ Al3+]And [ Fe ]]The molar ratio of the coagulant to the coagulant is 7:1, and the mixture is vibrated for 2 hours to obtain a coagulant D;
s5, selectingTaking domestic sewage of a certain local community as raw water to be treated, adding the coagulant D obtained in the step S6 into the domestic sewage, quickly stirring the mixture for 2min, and then stirring the mixture with G40S-1The raw water is stirred and flocculated at a low speed for 5-10 min in a gradient manner, and is precipitated for 15-20 min, so that the coagulation treatment of the raw water is completed.
The results of comparison of the indexes of the treated water and the raw water in this example are shown in Table 2.
Table 2 table of experimental results of example 2
Item Turbidity NTU DOC mg/L pH value
Raw water before treatment 16～19 410～459 6.8～7.2
The method is used to treat water after precipitation 3.2～4.8 103～138 6.8～6.9
As is clear from Table 2, the turbidity and DOC of the water treated by the coagulation method of the present invention were both significantly reduced.
Example 3
S1 AlCl with the preparation concentration of 0.2mol/L3A solution;
s2, preparing 0.4mol/L NaOH solution, and taking the NaOH solutionAdding into the above AlCl3In solution to make [ OH+]And [ Al3+]The molar ratio is 2.2:1 to obtain a polyaluminium chloride solution, and standing and curing are carried out for 24 hours;
s3, preparing a ferrous sulfate solution with the concentration of 0.025mol/L and a potassium borohydride solution with the concentration of 0.1mol/L, and adding the potassium borohydride solution into the ferrous sulfate solution under the protection of nitrogen to ensure that
Figure BDA0002297920550000061
And [ Fe ]2+]Was washed with ultrapure water until the pH of the washing solution became stable, and was dried. Obtaining solid C;
s4, adding the solid C into the solution to obtain [ Al3+]And [ Fe ]]The molar ratio of the coagulant to the coagulant is 15:1, and the mixture is vibrated for 2 hours to obtain a coagulant D;
s5, selecting domestic sewage of a certain cell at the periphery as raw water to be treated, adding the coagulant D obtained in the step S6 into the raw water, quickly stirring the mixture for 2min, and then mixing the mixture with G40S-1The raw water is stirred and flocculated at a low speed for 5-10 min in a gradient manner, and is precipitated for 15-20 min, so that the coagulation treatment of the raw water is completed.
The results of comparison of the indexes of the treated water and the raw water in this example are shown in Table 3.
Table 3 table of experimental results of example 3
Item Turbidity NTU DOC mg/L pH value
Raw water before treatment 15～20 222～307 6.9～7.1
The method is used to treat water after precipitation 2.8～3.5 50～81 6.8～7.0
As is clear from Table 3, the turbidity removal rate of the water treated by the coagulation method of the present invention was maintained at 85% or more, and the DOC removal rate was 62% or more.
To sum up the above
The invention has the advantages that the two coagulants are adopted, the coagulation effect on sewage and raw water with low turbidity (0-20 NTU) organic matter pollution (DOC content is 200-500 mg/L) is good, the removal rate of humic acid is greatly improved compared with the conventional coagulant and the coagulation process, the nano iron is adopted, the oxidation reaction is generated in situ in the coagulation process, the removal efficiency of organic matters is improved, the floc particles formed in the coagulation process have large mass, magnetism and good precipitation effect, can be rapidly precipitated in a subsequent sedimentation tank, the coagulant dosage is low, the medicament is saved, simultaneously, the sediment has recoverability, the influence of the coagulation process on the alkalinity, the pH value and the like of water is small, and the invention is suitable for the treatment of various sewage and surface water, strong in applicability and wide in application range.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. A method for preparing a coagulant with oxidation property is characterized in that: the method specifically comprises the following steps:
s1 AlCl with the preparation concentration of 0.2mol/L3A solution;
s2, preparing 0.4mol/L NaOH solution, and then adding the prepared NaOH solution into the AlCl prepared in the step S13In solution to make [ OH+]And [ Al3+]The molar ratio is 1.8: 1-2.2: 1, thus obtaining a polyaluminium chloride solution, and standing and curing for 24 hours;
s3, firstly preparing a ferrous sulfate solution with the concentration of 0.025mol/L and a potassium borohydride solution with the concentration of 0.1mol/L, and then adding the prepared potassium borohydride solution into the ferrous sulfate solution under the protection of nitrogen, so that the ferrous sulfate solution and the potassium borohydride solution are mixed to form a mixture
Figure FDA0002297920540000011
And [ Fe ]2+]The molar ratio of the compound to the compound is 4:1, then the generated solid sample is washed by ultrapure water until the pH value of the washing liquid is stable, and the solid sample is dried to obtain a solid C;
s4, adding the solid C obtained in the step S3 into the solution to ensure that [ Al3+]And [ Fe ]]The molar ratio of the coagulant to the coagulant is 1: 1-1: 15, and the mixture is vibrated for 2 hours to obtain a coagulant D;
and S5, adding the coagulant D obtained in the step S4 into the water body to be treated, quickly stirring for 2min, then slowly stirring and flocculating for 10-15 min, and precipitating for 15-20 min to finish the coagulation treatment of the low-turbidity water.
2. The method for preparing a coagulant with oxidizing property according to claim 1, characterized in that: the water body to be treated in the step S5 is a water body polluted by low-turbidity organic matters of 0-20 NTU, and the DOC content in the water body is 200-500 mg/L.
3. The method for preparing a coagulant with oxidizing property according to claim 1, characterized in that: the stirring speed gradient G of the rapid stirring in the step S5 is 140-250S-1And the stirring speed gradient G of the slow stirring is 40-100 s-1。
4. The method for preparing a coagulant with oxidizing property according to claim 1, characterized in that: in the step S4, a magnetic shaking stirrer with the model of EVR-034 is used for shaking operation.
CN201911210359.0A 2019-12-02 2019-12-02 Preparation method of coagulant with oxidation performance Pending CN110937671A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108017129A (en) * 2017-11-29 2018-05-11 浙江海洋大学 A kind of compound sewage inorganic agent

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108017129A (en) * 2017-11-29 2018-05-11 浙江海洋大学 A kind of compound sewage inorganic agent

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
刘畅: "混凝和Fe0预处理过程中氧化还原电位等参数变化规律的实验研究", 《中国优秀博硕士学位论文全文数据库（硕士） 工程科技Ⅰ辑》 *
厉衡隆等: "《铝冶炼生产技术手册（上册）》", 31 July 2011, 冶金工业出版社 *
台州学院教务处: "《台州学院2008届本科优秀毕业设计（论文）选编（下册）》", 31 October 2008 *

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