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Coagulate method of water treatment purifying technology

A purification process and water treatment technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor relative molecular weight and particle size flocculation bridging ability, unsatisfactory effect, and insufficient stability of water purification effect, etc., to achieve The effect of water purification is remarkable, the treatment effect is stable, and the effect of short storage time is solved

Inactive Publication Date: 2004-09-01
WUHAN UNIV OF TECH
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Problems solved by technology

However, in terms of morphology, degree of polymerization and corresponding coagulation-flocculation effects, inorganic polymer flocculants are still in the position between traditional metal salt flocculants and organic flocculants, and their relative molecular weight, particle size and flocculation bridging ability are still Worse than organic flocculants
[0005] The existing organic flocculants have defects such as short storage time (such as active silicic acid), certain toxicity of residual monomers (such as polyacrylamide), insufficient stability of water purification effect (such as carboxymethyl starch), and there are costs. High and other problems, so that its application is greatly restricted
[0006] In the existing water treatment and purification process, after the mixed use of inorganic polymer flocculants and organic polymer flocculants, chemical reactions or electrical neutralization will occur, so that their respective flocculation capabilities are weakened, resulting in practical application. The effect is not satisfactory

Method used

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  • Coagulate method of water treatment purifying technology

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Embodiment approach 1

[0016] The first embodiment of the method of the present invention is: an inorganic polymer metal salt flocculant—a coagulation method combining polyferric phosphate sulfate and urea starch.

[0017] The preparation method of polymeric ferric phosphate sulfate in this embodiment is as follows: (1) At room temperature, the mixture of ferrous sulfate and concentrated sulfuric acid is mixed and reacted with an aqueous solution of chlorine dioxide for more than 30 minutes; wherein the concentration of the aqueous solution of chlorine dioxide is 1.8 -2.2%, ferrous sulfate is FeSO 4 ·NH 2 The value range of O, n is between 0-8, and the concentration of concentrated sulfuric acid is above 98%; the mass ratio of ferrous sulfate, concentrated sulfuric acid, and chlorine dioxide aqueous solution is (5.8-6.1):1:( 3.8-4.0); (2) Add inorganic phosphate to the product obtained in (1) for polymerization, PO 4 3- / Fe mole ratio is 0.08-0.11; (3) to prepare polyferric phosphate sulfate (liquid). ...

Embodiment approach 2

[0021] The method embodiment of the present invention 2: Use inorganic polymer metal salt flocculant-polyaluminum chloride ([Al 2 (OH) n (SO 4 ) (3-n) / 2 ] m , N3) and urea starch are mixed in the form of an aqueous solution, and then directly added to the raw water to be treated; the mass ratio of polyaluminum chloride and urea starch is 10:1.

Embodiment approach 3

[0022] The method embodiment of the present invention 3: Use inorganic polymer metal salt flocculant——Polyferric sulfate ([Fe 2 (OH) n (SO 4 ) (3-n) / 2 ] m , N3) and urea starch are mixed in the form of an aqueous solution, and then directly added to the raw water pipeline for mixing. The dosage of these two coagulants is controlled by a metering pump. The mass ratio of polyferric sulfate and urea starch is 6:1.

[0023] In the above embodiment of the method of the present invention, the total dosage of metal salt flocculant and urea starch is generally about 1.8 kg / ton of raw water (low turbidity), and 2-2.7 kg / ton of raw water (high turbidity).

[0024] The preparation method 1 of urea starch in the present invention is: after mixing urea, dried corn starch, and aqueous solution, the resulting compound is kept under stirring at a temperature of 90°C for 4 hours and dried, and the quality of the urea, dried corn starch, and aqueous solution They are 1 kg, 20 kg, and 20 kg respec...

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Abstract

The invention relates to a coagulation process in water treatment purification technology, wherein metal salt flocculating agent and aquadrate starch are mixed in the form of water solution, and are charged into the water to be processed, the aquadrate, dried maize starch and water solution are mixed for mixing reaction for 3-4 hours under the temperature condition of 90-100 deg. C. The invention realizes fine water purification effect and less influence from water temperature.

Description

Technical field [0001] The invention relates to a coagulation method in a water treatment purification process, especially a water treatment purification process. Background technique [0002] The water treatment and purification processes all include coagulation process. The coagulation process is a process in which flocculants are added to the raw water to promote the destabilization of colloidal particles and continue to collide and grow, so that they can be removed by sedimentation. [0003] Flocculants used in the existing coagulation process generally include inorganic flocculants, organic flocculants, and inorganic polymer flocculants. [0004] Inorganic polymer flocculant is a new type of coagulant developed after 1970. Because of its superior water purification performance than traditional inorganic flocculants, its production and application have made rapid progress all over the world. However, in terms of morphology, degree of polymerization, and corresponding coagulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 李孟池波黄功洛史义雄
Owner WUHAN UNIV OF TECH
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