CN115818806A - Compound type titanium-based coagulant, and preparation method and application thereof - Google Patents
Compound type titanium-based coagulant, and preparation method and application thereof Download PDFInfo
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- CN115818806A CN115818806A CN202211593173.XA CN202211593173A CN115818806A CN 115818806 A CN115818806 A CN 115818806A CN 202211593173 A CN202211593173 A CN 202211593173A CN 115818806 A CN115818806 A CN 115818806A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention belongs to the technical field of water body purification, and particularly relates to a compound titanium-based coagulant, and a preparation method and application thereof; the coagulant comprises the following components in percentage by weight: 15-90 parts of titanium flocculant, 12-40 parts of inorganic flocculant, 3-24 parts of alkaline modifier and 2-16 parts of polymer coagulant aid. The coagulant has rich raw material sources, low cost and easy obtainment, the composite formula has excellent wastewater treatment effect, can effectively remove COD, suspended matters, chromaticity and the like in water, and has simple treatment method operation and stable operation, thereby being particularly suitable for application in the pretreatment of industrial wastewater.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a compound titanium-based coagulant, and a preparation method and application thereof.
Background
In recent years, due to the progress of science and technology and industrial level and the improvement of living standard of human beings, the water body pollution caused by human activities is increasingly serious, which not only influences the development of society and economy in China, but also directly or indirectly influences ecological environment and human bodies. Therefore, under the background that water resource pollution is becoming more and more serious, people put forward higher and higher requirements on water quality, the water environment standard is becoming stricter and stricter correspondingly, and the treatment of the water environment pollution is becoming irresistible. Industrial wastewater is highly destructive to the ecological environment due to the high concentration of pollutants, and is always concerned by the environmental water treatment community.
The traditional coagulation technology refers to a process of gathering and settling colloid and suspended particles in water by adding chemical agents and the like. In recent decades, the coagulation technology has rapidly developed in the aspects of coagulation chemistry (water quality chemistry, coagulant and flocculant chemistry, coagulation process chemistry), coagulation physics (coagulation kinetics and morphology), coagulation technology (including coagulation reactor process design and monitoring technology of the coagulation process), and the like, presents a very active research state, and faces breakthrough progress. On the basis of conventional coagulation, the aim of removing NOM in water by reinforced coagulation can be realized by developing a novel coagulant, increasing the adding amount, optimizing the coagulant according to water quality and optimizing operation parameters. The coagulant is a key factor for determining the coagulation technology, and from the whole, the coagulant basically shows the trend from inorganic low molecules to inorganic high molecules, and from simple inorganic high molecules to compound coagulants.
The research of the titanium salt coagulant is still in the initial stage, and although scholars at home and abroad carry out more comprehensive research on the synthesis, application and mechanism, the study still has the defects of low pH value of effluent, high cost and the like. However, a large number of experimental results show that the titanium salt has considerable development potential and application market as a coagulant. The titanium salt coagulant is not only applied to the removal of various target water samples or pollutants, but also gradually develops from simplification to compounding. The development process of the titanium salt coagulant is similar to the development of aluminum salt and iron salt coagulants, and the development trend gradually progresses from the traditional low-molecular single type to the high-molecular composite type, however, at present, the research on the polymeric titanium salt is still in the initial stage, and the research on the high-molecular titanium salt and the polymeric titanium salt coagulant needs to be further developed, so that the research on the novel titanium-based composite coagulant has important practical significance for fully understanding the action mechanism of the titanium salt coagulant and promoting the practical application of the titanium-based coagulant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, one aim of the invention is to provide a compound titanium-based coagulant, the other aim of the invention is to provide a preparation method of the compound titanium-based coagulant, and the third aim of the invention is to provide an application of the compound titanium-based coagulant in wastewater treatment. The coagulant has rich raw material sources, low cost and easy obtainment, the composite formula has excellent wastewater treatment effect, can effectively remove COD, suspended matters, chromaticity and the like in water, has simple operation and stable operation, and is particularly suitable for application in the pretreatment of industrial wastewater.
The technical scheme of the invention is as follows:
a compound titanium-based coagulant comprises the following components: titanium flocculant, inorganic flocculant, alkaline modifier and polymer coagulant aid.
Preferably, the components consist of: 15 to 90 parts of titanium flocculant, 12 to 40 parts of inorganic flocculant, 3 to 24 parts of alkaline modifier and 2 to 16 parts of polymer coagulant aid.
Further preferably, the components consist of: 30-60 parts of titanium flocculant, 20-32 parts of inorganic flocculant, 6-12 parts of alkaline modifier and 4-8 parts of polymer coagulant aid.
The applicant has unexpectedly found in a large number of experiments that the water purification effect of the coagulant of the invention is optimal under the following specific component proportions, wherein 45 parts of titanium flocculant, 16 parts of inorganic flocculant, 9 parts of alkaline modifier and 6 parts of high-molecular coagulant aid are used.
More preferably, the titanium flocculant is a mixture of polymeric titanium aluminum chloride and polymeric titanium iron chloride; the inorganic flocculant is ferric trichloride, magnesium chloride and aluminum sulfate; the alkaline modifier is calcium hydroxide and disodium hydrogen phosphate; the polymer coagulant aid is polyacrylamide or polydimethyldiallyl ammonium chloride.
The applicant finds out unexpectedly in a large number of experiments that the water purifying effect of the coagulant is optimal under the following specific component ratios, wherein the mass ratio of polyacrylamide to poly (dimethyldiallylammonium chloride) is 3; the mass ratio of the polymeric titanium aluminum chloride to the polymeric titanium iron chloride is 1; the mass ratio of ferric trichloride to magnesium chloride to aluminum sulfate is 1; the mass ratio of the calcium hydroxide to the disodium hydrogen phosphate is 2.
A preparation method of a compound titanium-based coagulant comprises the following preparation methods:
the preparation method of the titanium aluminum polychlorid comprises the following steps: (1) Slowly adding ice pure water into anhydrous aluminum chloride, and fully stirring for 30 min under an ice bath condition until the ice pure water is completely dissolved to obtain an aluminum chloride solution; (2) Dropwise adding titanium tetrachloride into the aluminum chloride solution, and fully stirring for 90min under an ice bath condition to obtain a mixed solution of titanium tetrachloride and aluminum chloride, wherein the molar ratio of the titanium tetrachloride to the aluminum chloride is 2; (3) And (3) dropwise adding a NaOH solution into the mixed solution of titanium tetrachloride and aluminum chloride until the alkalization degree is 0.6-0.8 and the concentration of sodium hydroxide is 80g/L, and continuously stirring for 2-4 h until the solution is free of precipitation, thereby obtaining the polymeric titanium aluminum chloride.
The preparation method of the polymerized titanium iron chloride comprises the following steps: (1) Slowly adding ice pure water into anhydrous ferric chloride, and fully stirring for 30 min under an ice bath condition until the ice pure water is completely dissolved to obtain a ferric chloride solution; (2) Dropwise adding titanium tetrachloride into the ferric chloride solution, and fully stirring for 90min under an ice bath condition to obtain a mixed solution of titanium tetrachloride and ferric chloride, wherein the molar ratio of the titanium tetrachloride to the ferric chloride is 3; (3) And (3) dropwise adding a NaOH solution into the mixed solution of the titanium tetrachloride and the ferric chloride until the alkalization degree is 0.6-0.8 and the concentration of sodium hydroxide is 100g/L, and continuously stirring for 2-4 h until the solution is free of precipitation, thereby obtaining the polymerized titanium iron chloride.
The application of the compound titanium-based coagulant in wastewater treatment comprises the following steps:
uniformly mixing an inorganic flocculant and an alkaline modifier to obtain a solid mixture A, dissolving a polymer coagulant aid in purified water with the mass of 100 times, uniformly mixing to obtain a liquid mixture B, uniformly adding the solid mixture A into the wastewater to be treated for 2-3 times, quickly stirring for 10-15 minutes, adding a titanium flocculant into the wastewater to be treated for one time, quickly stirring for 20-30 minutes, finally adding the liquid mixture B into the wastewater to be treated for one time, slowly stirring for 2-5 minutes, and standing.
Preferably, the dosage of the solid mixture A in the wastewater to be treated is 0.3-1.0g/L, the dosage of the titanium flocculant in the wastewater to be treated is 0.2-0.8g/L, and the dosage of the liquid mixture B in the wastewater to be treated is 0.1-0.3g/L.
The invention has the technical effects that:
1. the titanium-based coagulant of the invention exerts the synergistic effect among different coagulants through the synergistic effect and the synergistic effect among different components, and obtains good coagulation effect.
The titanium-based coagulant reduces the corrosion to equipment, overcomes the defects of single use of the titanium-containing coagulant and widens the application range.
3. When the water temperature is close to the freezing point, the coagulation effect of the titanium-based coagulant is obviously better than that of the traditional aluminum salt and iron salt, so that the titanium-based coagulant is also suitable for treating the winter wastewater in the northern area of China and has important practical significance.
4. The raw materials used by the titanium-based coagulant are cheap and easy to obtain, the titanium resource is rich and has no biotoxicity, the titanium-based coagulant has good compatibility with human bones and blood, the titanium-based coagulant is safe and nontoxic, the preparation process is simple, the composite formula has good wastewater treatment effect, and the titanium-based coagulant is particularly suitable for the treatment of industrial wastewater.
Detailed Description
The invention is further illustrated by the following examples, which should be properly understood: the examples of the present invention are merely illustrative and not restrictive, and therefore, the present invention may be modified in a simple manner without departing from the scope of the invention as claimed.
The iron trichloride, the magnesium chloride, the aluminum sulfate, the calcium hydroxide, the disodium hydrogen phosphate, the polyacrylamide, the poly dimethyl diallyl ammonium chloride, the anhydrous aluminum chloride, the anhydrous ferric chloride, the titanium tetrachloride and the sodium hydroxide are all commercially available products.
In the following examples, various procedures and methods not described in detail are conventional methods well known in the art.
In the following examples, the preparation method of the titanium aluminum polychloride comprises the following steps: (1) Slowly adding ice pure water into anhydrous aluminum chloride, and fully stirring for 30 min under an ice bath condition until the ice pure water is completely dissolved to obtain an aluminum chloride solution; (2) Dropwise adding titanium tetrachloride into the aluminum chloride solution, and fully stirring for 90min under an ice bath condition to obtain a mixed solution of titanium tetrachloride and aluminum chloride, wherein the molar ratio of the titanium tetrachloride to the aluminum chloride is 2; (3) And (3) dropwise adding a sodium hydroxide solution into the mixed solution of titanium tetrachloride and aluminum chloride until the alkalization degree is 0.6-0.8 and the NaOH concentration is 80g/L, and continuously stirring for 2-4 h until the solution is free of precipitation, thereby obtaining the polymeric titanium aluminum chloride.
In the following examples, the preparation method of the polymerized titanium iron chloride comprises the following steps: (1) Slowly adding ice pure water into anhydrous ferric chloride, and fully stirring for 30 min under an ice bath condition until the ice pure water is completely dissolved to obtain a ferric chloride solution; (2) Dropwise adding titanium tetrachloride into the ferric chloride solution, and fully stirring for 90min under an ice bath condition to obtain a mixed solution of titanium tetrachloride and ferric chloride, wherein the molar ratio of the titanium tetrachloride to the ferric chloride is 3; (3) And (3) dropwise adding a sodium hydroxide solution into the mixed solution of the titanium tetrachloride and the ferric chloride until the alkalization degree is 0.6-0.8 and the NaOH concentration is 100g/L, and continuously stirring for 2-4 hours until the solution is free of precipitation, thus obtaining the polymeric ferric chloride iron.
Example 1
45 parts of titanium flocculant (15 parts of polymerized titanium aluminum chloride and 30 parts of polymerized titanium iron chloride), 16 parts of inorganic flocculant (4 parts of ferric trichloride, 4 parts of magnesium chloride and 8 parts of aluminum sulfate), 9 parts of alkaline modifier (6 parts of calcium hydroxide and 3 parts of disodium hydrogen phosphate) and 6 parts of polymer coagulant aid (4.5 parts of polyacrylamide and 1.5 parts of polydimethyldiallyl ammonium chloride). And stirring and mixing the inorganic flocculant and the alkaline modifier uniformly to obtain a mixture A1. The polymer coagulant aid is dissolved in 600 parts of purified water and mixed uniformly to obtain a liquid mixture B1.
Example 2
30 parts of titanium flocculant (10 parts of polymerized titanium aluminum chloride and 20 parts of polymerized titanium iron chloride), 32 parts of inorganic flocculant (8 parts of ferric trichloride, 8 parts of magnesium chloride and 16 parts of aluminum sulfate), 6 parts of alkaline modifier (4 parts of calcium hydroxide and 2 parts of disodium hydrogen phosphate) and 8 parts of polymer coagulant aid (6 parts of polyacrylamide and 2 parts of poly dimethyl diallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture A2. And dissolving the high-molecular coagulant aid in 800 parts of purified water, and uniformly mixing to obtain a liquid mixture B2.
Example 3
60 parts of titanium flocculant (20 parts of polymeric titanium aluminum chloride and 40 parts of polymeric titanium iron chloride), 10 parts of inorganic flocculant (2.5 parts of ferric trichloride, 2.5 parts of magnesium chloride and 5 parts of aluminum sulfate), 12 parts of alkaline modifier (8 parts of calcium hydroxide and 4 parts of disodium hydrogen phosphate) and 4 parts of polymer coagulant aid (3 parts of polyacrylamide and 1 part of polydimethyldiallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture A3. The polymer coagulant aid is dissolved in 400 parts of purified water and mixed uniformly to obtain a liquid mixture B3.
Example 4
15 parts of titanium flocculant (5 parts of polymerized titanium aluminum chloride and 10 parts of polymerized titanium iron chloride), 12 parts of inorganic flocculant (3 parts of ferric trichloride, 3 parts of magnesium chloride and 6 parts of aluminum sulfate), 3 parts of alkaline modifier (2 parts of calcium hydroxide and 1 part of disodium hydrogen phosphate) and 2 parts of polymer coagulant aid (1.5 parts of polyacrylamide and 0.5 part of poly dimethyl diallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture A4. And dissolving the polymer coagulant aid in 200 parts of purified water, and uniformly mixing to obtain a liquid mixture B4.
Example 5
90 parts of titanium flocculant (30 parts of polymerized titanium aluminum chloride and 60 parts of polymerized titanium iron chloride), 40 parts of inorganic flocculant (10 parts of ferric trichloride, 10 parts of magnesium chloride and 20 parts of aluminum sulfate), 24 parts of alkaline modifier (16 parts of calcium hydroxide and 8 parts of disodium hydrogen phosphate) and 16 parts of polymer coagulant aid (12 parts of polyacrylamide and 4 parts of poly dimethyl diallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture A5. And dissolving the polymer coagulant aid in 1600 parts of purified water, and uniformly mixing to obtain a liquid mixture B5.
The coagulant of the invention is used in the following examples as follows: firstly, evenly putting the solid mixture A into the wastewater to be treated for 2-3 times, quickly stirring for 10-15 minutes, then adding the titanium flocculant into the wastewater to be treated at one time, quickly stirring for 20-30 minutes, finally adding the liquid mixture B into the wastewater to be treated at one time, slowly stirring for 2-5 minutes, and standing.
Example 6
In this example, the water purification effects of the mixtures prepared in examples 1 to 5 and commercially available polyaluminum chloride and polyferric chloride were examined. A water sample is taken from a comprehensive sewage adjusting tank of a petrochemical industry park, and the using effect of the coagulant in typical industrial wastewater treatment is investigated. The indexes of the wastewater are as follows: the COD is 8910mg/L; the chroma is 2000 times, the turbidity is 950NTU, the treatment capacity is 1000L respectively, under the condition that other test conditions and steps are the same, the adding amount of the solid mixture A1-A5 is 0.6g/L, the adding amount of the titanium flocculant is 0.8g/L, the adding amount of the liquid mixture B1-B5 is 0.2g/L, the adding amount of polyaluminum chloride and PAM is 1.6g/L, and the adding amount of the polyferric chloride and PAM is 1.6g/L. The effect of the treatment is shown in table one.
Table showing the use effect of the coagulant of the invention in the petrochemical wastewater treatment
As can be seen from the table I, the coagulant has excellent removal effects on COD, chromaticity and turbidity of petrochemical comprehensive sewage, and is superior to the combination of polyaluminium chloride, polyferric chloride and PAM, wherein the effect of the embodiment 1 is the best, the water quality index after being treated by the coagulant is obviously improved, and the coagulant is beneficial to the subsequent further biochemical treatment.
Example 7
In this example, the water purification effects of the mixtures prepared in examples 1 to 5 and commercially available polyaluminum chloride and polyferric chloride were examined. A water sample is taken from a comprehensive sewage regulating tank of a certain medical intermediate production enterprise, and the use effect of the coagulant in typical industrial wastewater treatment is investigated. The indexes of the wastewater are as follows: the COD is 7850mg/L; the chroma is 2000 times, the turbidity is 850NTU, the treatment capacity is 1000L respectively, under the condition of the same other test conditions and steps, the adding amount of the solid mixture A1-A5 is 0.8g/L, the adding amount of the titanium flocculant is 0.5g/L, the adding amount of the liquid mixture B1-B5 is 0.1g/L, the adding amount of polyaluminium chloride and PAM is 1.4g/L, and the adding amount of the polyferric chloride and PAM is 1.4g/L. The effect of the treatment is shown in table one.
TABLE II use effect of the coagulant in medical intermediate sewage treatment
As can be seen from the table I, the coagulant has excellent removal effects on COD, chroma and turbidity of the medical intermediate comprehensive sewage, and is superior to the combination of polyaluminium chloride, polyferric chloride and PAM, wherein the effect of the embodiment 1 is the best, the water quality index after being treated by the coagulant is obviously improved, and the coagulant is beneficial to the subsequent further biochemical treatment.
Comparative example 1
12 parts of titanium flocculant (6 parts of polymerized titanium aluminum chloride and 6 parts of polymerized titanium iron chloride), 10 parts of inorganic flocculant (5 parts of ferric trichloride, 2.5 parts of magnesium chloride and 2.5 parts of aluminum sulfate), 3 parts of alkaline modifier (1 part of calcium hydroxide and 2 parts of disodium hydrogen phosphate) and 2 parts of high-molecular coagulant aid (1 part of polyacrylamide and 1 part of poly dimethyl diallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture X1. And dissolving the polymer coagulant aid in 200 parts of purified water, and uniformly mixing to obtain a liquid mixture Y1.
Comparative example 2
100 parts of titanium flocculant (50 parts of polymerized titanium aluminum chloride and 50 parts of polymerized titanium iron chloride), 50 parts of inorganic flocculant (20 parts of ferric trichloride, 20 parts of magnesium chloride and 10 parts of aluminum sulfate), 25 parts of alkaline modifier (15 parts of calcium hydroxide and 10 parts of disodium hydrogen phosphate) and 18 parts of polymer coagulant aid (10 parts of polyacrylamide and 8 parts of poly dimethyl diallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture X2. The polymer coagulant aid is dissolved in 1800 parts of purified water and uniformly mixed to obtain a liquid mixture Y2.
Comparative example 3
45 parts of titanium flocculant (45 parts of polymerized titanium aluminum chloride), 16 parts of inorganic flocculant (8 parts of ferric trichloride and 8 parts of aluminum sulfate), 9 parts of alkaline modifier (9 parts of disodium hydrogen phosphate), and 6 parts of high-molecular coagulant aid (4.5 parts of polyacrylamide and 1.5 parts of poly dimethyl diallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture X3. And dissolving the polymer coagulant aid in 600 parts of purified water, and uniformly mixing to obtain a liquid mixture Y3.
Comparative example 4
45 parts of titanium flocculant (45 parts of polymerized ferrotitanium chloride), 16 parts of inorganic flocculant (4 parts of ferric trichloride and 8 parts of magnesium chloride), 9 parts of alkaline modifier (9 parts of calcium hydroxide) and 6 parts of high-molecular coagulant aid (4.5 parts of polyacrylamide). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture X4. And dissolving the polymer coagulant aid in 600 parts of purified water, and uniformly mixing to obtain a liquid mixture Y4.
Comparative example 5
16 parts of inorganic flocculant (4 parts of ferric trichloride, 4 parts of magnesium chloride and 8 parts of aluminum sulfate), 9 parts of alkaline modifier (6 parts of calcium hydroxide and 3 parts of disodium hydrogen phosphate) and 6 parts of polymer coagulant aid (4.5 parts of polyacrylamide and 1.5 parts of poly dimethyl diallyl ammonium chloride). And stirring and mixing the inorganic flocculant and the alkaline modifier uniformly to obtain a mixture X5. And dissolving the polymer coagulant aid in 600 parts of purified water, and uniformly mixing to obtain a liquid mixture Y5.
Comparative example 6
45 parts of titanium flocculant (15 parts of polymerized titanium aluminum chloride and 30 parts of polymerized titanium iron chloride), 9 parts of alkaline modifier (6 parts of calcium hydroxide and 3 parts of disodium hydrogen phosphate) and 6 parts of polymer coagulant aid (4.5 parts of polyacrylamide and 1.5 parts of poly dimethyl diallyl ammonium chloride). And stirring and uniformly mixing the inorganic flocculant and the alkaline modifier to obtain a mixture X6. And dissolving the polymer coagulant aid in 600 parts of purified water, and uniformly mixing to obtain a liquid mixture Y6.
Comparative example 7
45 parts of titanium flocculant (15 parts of polymerized titanium aluminum chloride and 30 parts of polymerized titanium iron chloride) and 16 parts of inorganic flocculant (4 parts of ferric trichloride, 4 parts of magnesium chloride and 8 parts of aluminum sulfate). And stirring and uniformly mixing the inorganic flocculant and the alkali modifier to obtain a mixture X7. And dissolving the polymer coagulant aid in 600 parts of purified water, and uniformly mixing to obtain a liquid mixture Y7.
Verification example 8
In order to verify the effect of the technical scheme of the invention, the use effect of each embodiment in typical industrial wastewater treatment is considered. The water sample is taken from a comprehensive sewage adjusting tank of a petrochemical industry park. The indexes of the wastewater are as follows: the COD is 8910mg/L; the color was 2000 times, the turbidity was 950NTU, the treatment capacity was 1000L each, and under the same test conditions and procedures, the amounts of the solid mixtures A1 to A5 and X1 to X7 added were 0.6g/L, the amount of the titanium-based flocculant added was 0.8g/L, and the amounts of the liquid mixtures B1 to B5 and Y1 to Y7 added were 0.2g/L. The effect of the treatment is shown in table three.
Comparison of use effects of the coagulant in petrochemical wastewater treatment
It can be seen from table three that the removal effect of the petrochemical wastewater is obviously reduced after the formula of the coagulant is proportionally adjusted or deleted, which shows that the coagulant prepared by mixing the titanium flocculant, the inorganic flocculant, the alkaline modifier and the polymer coagulant aid according to a certain proportion has synergistic effect, and can achieve good wastewater treatment effect only when being used simultaneously.
Claims (12)
1. The compound titanium-based coagulant is characterized by being prepared from the following components: titanium flocculant, inorganic flocculant, alkaline modifier and polymer coagulant aid.
2. A coagulant as claimed in claim 1 wherein the coagulant is prepared from: 15-90 parts of titanium flocculant, 12-40 parts of inorganic flocculant, 3-24 parts of alkaline modifier and 2-16 parts of polymer coagulant aid.
3. A coagulant as claimed in claim 1 wherein the coagulant is prepared from: 30-60 parts of titanium flocculant, 20-32 parts of inorganic flocculant, 6-12 parts of alkaline modifier and 4-8 parts of polymer coagulant aid.
4. The coagulant according to claim 1, characterized in that it is prepared from the following components in parts by weight: 45 parts of titanium flocculant, 16 parts of inorganic flocculant, 9 parts of alkaline modifier and 6 parts of polymer coagulant aid.
5. The coagulant according to claim 1, wherein the titanium flocculant is a mixture of polymeric titanium aluminum chloride and polymeric titanium iron chloride, and the mass ratio of the polymeric titanium aluminum chloride to the polymeric titanium iron chloride is 1.
6. The coagulant according to claim 1, wherein the inorganic flocculant is ferric chloride, magnesium chloride and aluminum sulfate, and the mass ratio of ferric chloride to magnesium chloride to aluminum sulfate is 1.
7. A coagulant according to claim 1 wherein the alkaline modifier is calcium hydroxide or disodium hydrogen phosphate, and the mass ratio of calcium hydroxide to disodium hydrogen phosphate is 2.
8. The coagulant according to claim 1, wherein the polymeric coagulant aid is polyacrylamide or polydimethyldiallylammonium chloride, and the mass ratio of polyacrylamide to polydimethyldiallylammonium chloride is 3.
9. The coagulant according to claim 5, wherein the preparation method of the polymerized titanium aluminum chloride is as follows: (1) Slowly adding ice pure water into anhydrous aluminum chloride, and fully stirring for 30 min under an ice bath condition until the ice pure water is completely dissolved to obtain an aluminum chloride solution; (2) Dropwise adding titanium tetrachloride into the aluminum chloride solution, and fully stirring for 90min under an ice bath condition to obtain a mixed solution of titanium tetrachloride and aluminum chloride, wherein the molar ratio of the titanium tetrachloride to the aluminum chloride is 2; (3) And (3) dropwise adding a sodium hydroxide solution into the mixed solution of titanium tetrachloride and aluminum chloride until the alkalization degree is 0.6-0.8 and the NaOH concentration is 80g/L, and continuously stirring for 2-4 h until the solution is free of precipitation, thereby obtaining the polymeric titanium aluminum chloride.
10. A coagulant according to claim 5, characterized in that the polymeric titanium iron chloride is prepared by the following steps: (1) Slowly adding ice pure water into anhydrous ferric chloride, and fully stirring for 30 min under an ice bath condition until the ice pure water is completely dissolved to obtain a ferric chloride solution; (2) Dropwise adding titanium tetrachloride into the ferric chloride solution, and fully stirring for 90min under an ice bath condition to obtain a mixed solution of titanium tetrachloride and ferric chloride, wherein the molar ratio of the titanium tetrachloride to the ferric chloride is 3; (3) And (3) dropwise adding a sodium hydroxide solution into the mixed solution of the titanium tetrachloride and the ferric chloride until the alkalization degree is 0.6-0.8 and the NaOH concentration is 100g/L, and continuously stirring for 2-4 h until the solution is free of precipitation, thereby obtaining the polymerized titanium iron chloride.
11. Use of a coagulant according to any of claims 1 to 11 in the treatment of wastewater, characterized in that the method of use is as follows: uniformly mixing an inorganic flocculant and an alkaline modifier to obtain a solid mixture A, dissolving a polymer coagulant aid in purified water with the mass of 100 times, uniformly mixing to obtain a liquid mixture B, uniformly adding the solid mixture A into the wastewater to be treated for 2-3 times, quickly stirring for 10-15 minutes, adding a titanium flocculant into the wastewater to be treated for one time, quickly stirring for 20-30 minutes, finally adding the liquid mixture B into the wastewater to be treated for one time, slowly stirring for 2-5 minutes, and standing.
12. The use of a coagulant according to claim 12 for wastewater treatment, wherein the amount of the solid mixture a to be fed into wastewater to be treated is 0.3 to 1.0g/L, the amount of the titanium-based flocculant to be fed into wastewater to be treated is 0.2 to 0.8g/L, and the amount of the liquid mixture B to be fed into wastewater to be treated is 0.1 to 0.3g/L.
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| CN109292936A (en) * | 2018-12-07 | 2019-02-01 | 北京交通大学 | Aluminium polychloride Ti-inorganic compound coagulant and its preparation method and application |
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| CN1785836A (en) * | 2005-10-28 | 2006-06-14 | 上海工程技术大学 | High efficiency composite flocculant, its preparation method and application |
| CN103641220A (en) * | 2013-11-16 | 2014-03-19 | 合肥宏士达环保科技有限责任公司 | Flocculant for treatment of high concentration organic wastewater and its preparation method |
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