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Polyaluminium chloride-aluminum sulfate-poly dimethyl diallyl ammonium chloride ternary composite coagulant as well as preparation and application methods thereof

A technology of polydimethyldiallyl ammonium chloride and polyaluminum chloride, which is applied in flocculation/precipitation water/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the active ingredient of inorganic aluminum salt The composition structure is not clear, the composition and content are not clear, and the problems are not clearly raised, so as to achieve the effect of clear composition, superior performance, and safe and reliable water quality of the serialized products.

Inactive Publication Date: 2011-06-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0018] (1) The composition and structure of the active ingredient of the main raw material inorganic aluminum salt is not clear, and the composition and content of other important components in the main raw material such as various metal salts, especially heavy metal salts, and harmful impurities are not clear, such as documents 1 and 2
[0019] (2) Inorganic salt organic cationic polymer composite coagulant should be mixed and added before and after use, including adding immediately after mixing, adding at the same time and putting in successively, etc. It is not clearly proposed that a stable composite coagulation should be made first Reuse of the agent, such as literature 1, 2, or although it has been clearly pointed out to make a stable composite coagulant, it is limited to the two-component composite coagulant of PAC and PDMDAAC, and the degree of composite modification is limited to a certain extent. The best application range is still within the applicable range of PAC, as document 3
[0020] It can be seen that the above shortcomings have caused the existing mixtures or composite coagulants of various inorganic aluminum salts and organic cationic polymers to be unable to become a class of multi-component composition structure, simple production process, and product storage properties. Stable, easy to use, obvious application performance characteristics, wide applicability, safe and reliable, it can be used for various raw water, especially the compound coagulant for the coagulation treatment of raw water affected by bacteria and algae, micro-polluted organic matter, low-temperature and low-turbidity river network and lakes

Method used

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  • Polyaluminium chloride-aluminum sulfate-poly dimethyl diallyl ammonium chloride ternary composite coagulant as well as preparation and application methods thereof
  • Polyaluminium chloride-aluminum sulfate-poly dimethyl diallyl ammonium chloride ternary composite coagulant as well as preparation and application methods thereof
  • Polyaluminium chloride-aluminum sulfate-poly dimethyl diallyl ammonium chloride ternary composite coagulant as well as preparation and application methods thereof

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preparation example Construction

[0041] In conjunction with the accompanying drawings, the polyaluminum chloride-aluminum sulfate-polydimethyldiallylammonium chloride ternary composite coagulant of the present invention is prepared by the following method, that is, (1) PAC dry powder or solution is placed in In the mixing tank, add water to adjust the content to Al 2 o 3 Calculate the PAC solution with a mass fraction of 10.5% to 20.5%, stir the solution at room temperature or under heating, add AS dry powder or solution, add water to dissolve under stirring to obtain a binary mixed solution, and further drop a small amount of alkali or alkaline earth metal compound, Regulating the basicity of this mixed solution is 40%~90%, obtains PAC content (in Al 2 o 3 Mass fraction, the same below) is 5.0% to 13.0%, and its AS content (as Al 2 o 3 The mass fraction meter, the same below) is a binary mixed solution with a ratio of 4.0:1.0 to 4.0:0.2;

[0042] (2) Stir the binary mixed solution at room temperature or...

Embodiment 1

[0064] In conjunction with the accompanying drawings, the polyaluminum chloride-aluminum sulfate-polydimethyldiallylammonium chloride ternary composite coagulant of the present invention and its preparation and application method are:

[0065] In the first step, put the PAC dry powder or solution in the mixing tank, add water to prepare the amount in Al 2 o 3 Calculate the PAC solution with a mass fraction of 10.5% to 20.5%, stir the solution at -5 to 35°C at room temperature, add AS dry powder or solution, add water to dissolve under stirring to obtain a binary mixed solution, and further add a small amount of dilute sodium carbonate dropwise Solution, control salinity (60±5)%, obtain PAC content (as Al 2 o 3 Mass fraction, the same below) is (5.0±0.5)%, and the ratio of it to AS content is 4.0:0.4 binary mixed solution;

[0066] In the second step, stir the mixed solution at room temperature at -5 to 35°C, add PDMDAAC colloid with a characteristic viscosity range of 1.5 t...

Embodiment 2

[0075] In conjunction with the accompanying drawings, the polyammonium chloride-aluminum sulfate-polydimethyldiallylammonium chloride composite coagulant of the present invention and its preparation and application method are:

[0076] In the first step, put the PAC dry powder or solution in the mixing tank, add water to prepare the amount in Al 2 o 3 Calculate the PAC solution with a mass fraction of 10.5% to 20.5%, stir the solution at -5 to 35°C at room temperature, add AS dry powder or solution, add water to dissolve under stirring to obtain a binary mixed solution, and further drop a small amount of dilute hydrogen to oxidize Calcium solution, control salinity (45±5)%, obtain PAC content (as Al 2 o 3 Mass fraction, the same below) is (12.0±0.5)%, and the ratio of it to AS content is 4.0:1.0 binary mixed solution;

[0077] In the second step, the binary mixed solution was stirred at room temperature at -5 to 35°C, and PDMDAAC colloid with a characteristic viscosity in t...

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Abstract

The invention discloses a polyaluminium chloride-aluminum sulfate-poly dimethyl diallyl ammonium chloride ternary composite coagulant as well as preparation and application methods thereof. The preparation and application methods comprise the steps of: putting PAC (Poly Aluminium Chloride) dry powder or solution in a mixing reactor, adding water for blending to obtain a PAC solution, stirring the PAC solution, adding AS (Aluminum Sulfate) dry powder or solution, adding water for dissolving under stirring, further dropping alkali or alkaline earth metal compound to control basicity to obtain a binary mixed solution containing the PAC and the AS; stirring the binary mixed solution, adding PDMDAAC (poly dimethyl diallyl ammonium chloride) colloid or dry powder, stirring until the PDMDAAC colloid is completely dissolved to obtain a stable PAC-AS-PDMDAAC ternary compound coagulant, wherein the contents of the PAC and the AS are metered in the terms of the mass percent of the Al2O3; and diluting the ternary compound coagulant with water or directly putting the ternary compound coagulant to be used for coagulating raw materials, flocculating wastewater and sewage and dewatering sludge. The ternary compound coagulant is directly put (or diluted) according to the putting amount requirement in a single chemical agent form for strengthening and coagulating various kinds of raw water, flocculating the wastewater and the sewage and dewatering the sludge.

Description

technical field [0001] The invention relates to a compound preparation technology of an inorganic aluminum salt coagulant and an organic cationic polymer, in particular to a ternary compound of polyaluminum chloride-aluminum sulfate-polydimethyldiallylammonium chloride Coagulants and methods for their preparation and use. Background technique [0002] Polyaluminum chloride (Poly Aluminum Chloride, PAC) is a widely used inorganic polymer water treatment agent, and its structural representation is as follows: [0003] Al n (OH) m Cl (3n-m) (Formula 1) [0004] Among them, 0<m<3n. [0005] The advantage of polyaluminum chloride is that it has a larger relative molecular mass than traditional low-molecular aluminum salts, such as aluminum sulfate and aluminum chloride. The price of the agent is low. However, due to the limitations of its molecular structure and degree of polymerization, it is still between traditional aluminum salts and organic polymers in terms...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F11/14
Inventor 张跃军赵晓蕾李潇潇
Owner NANJING UNIV OF SCI & TECH
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