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Composite flocculant and preparation method and application thereof

A technology of composite flocculant and flocculant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of not being widely used, high dosage, and unsatisfactory removal of wastewater chroma, so as to achieve good coagulation effect and low dosage Less, excellent coagulation effect

Inactive Publication Date: 2010-06-16
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned flocculants have their own advantages, they have not been widely used due to their own limitations.
At present, the commonly used flocculants include polyaluminum chloride PAC, polyaluminum sulfate PAS and other inorganic polymer coagulants. Although this type of flocculant has a good flocculation effect, the dosage is high, and it is not ideal for the removal of wastewater color.

Method used

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  • Composite flocculant and preparation method and application thereof

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Embodiment 1

[0031] Embodiment 1 Preparation of polysilicon aluminum lanthanum sulfate (PASS-RE)

[0032] The polysilicoaluminum sulfate lanthanum (PASS-RE) of the present embodiment, its preparation method comprises the steps:

[0033] (1) Take by weighing 2.3 grams of lanthanum carbonate (purity 99.0%), use 7ml mass fraction 60% nitric acid, be heated to 50 ℃ and dissolve, this solution is lanthanum nitrate solution, stand-by;

[0034] (2) Take 12.3 grams of sodium silicate (purity 99%, 0.1mol), dissolve and dilute to SiO with desalted water 2 Accounting for about 5% of the total mass of the solution, then add 20% dilute H 2 SO 4 Adjust the pH value of the total system of the solution to 5.0-5.5, and stir the polymerization reaction at 30-35°C for 12-15 minutes. After the solution turns from clear to light blue, add 30.0 grams of Al 2 (SO 4 ) 3 18H 2 O (purity 96%), continue to stir until the solids are completely dissolved, then add the obtained lanthanum nitrate solution prepared...

Embodiment 2

[0036] Example 2 Preparation of polysilicate lanthanum ferric sulfate (PFSS-RE)

[0037] The polysilicon ferric lanthanum sulfate (PFSS-RE) of this embodiment, its preparation method is according to the preparation process described in Example 1, replaces aluminum sulfate octadecadecahydrate with 18.4 grams of iron sulfate (purity 98%), can make liquid poly Lanthanum ferrosilicate sulfate (Fe:Si:La molar ratio 0.9:1:0.1). The active ingredients of this liquid product are: Fe 2 o 3 4.8%, SiO 2 3.9%, La 2 o 3 1.3%, SO 4 2- 8.7%, NO 3 - 3.6%, solid content 22.8%.

Embodiment 3

[0038] Example 3 Preparation of polysilicoaluminum lanthanum cerium (PASS-Ce-La)

[0039] The polysilicoaluminum lanthanum cerium sulfate (PASS-Ce-La) of the present embodiment, its preparation method comprises the steps:

[0040] (1) Take by weighing 2.3 grams of mixed rare earth carbonate (the mass fraction of cerium carbonate is 65.3%; the mass fraction of lanthanum carbonate is 34.3%), and use 8ml mass fraction of 60% nitric acid to dissolve at 50°C. This solution is lanthanum cerium nitrate solution, ready to use;

[0041] (2) Take 12.3 grams of sodium silicate (purity 99%, 0.1mol), dissolve and dilute to SiO with desalted water 2 Accounting for about 5% of the total mass of the solution, then add dilute H with a mass fraction of 30% to the solution 2 SO 4 Adjust the pH value of the solution to 5.0-5.5, and stir the polymerization reaction at 30-35°C for 12-15 minutes. After the solution turns from clear to light blue, add 30.0 grams of Al 2 (SO 4 ) 3 18H 2 O (puri...

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Abstract

The invention discloses a composite flocculant and a preparation method and application thereof. The flocculant is prepared from rare-earth carbonate, sodium silicate and ferric sulfate / aluminum sulfate serving as raw materials by a composite copolymerization method. The effect of the composite flocculant of the invention is superior to that of the conventional polymeric ferric / aluminum silicate sulfate; the chroma removal rate of wastewater reaches over 90 percent; the COD Cr removal rate reaches over 65 percent; the removal rate of total phosphorus reaches over 88 percent; and the expense of a wastewater treatment medicament is reduced by 10 to 20 percent compared with PASS. The composite flocculant has rapid, large and solid alumen ustum, reduces the use amount of a single dye wastewater coagulating agent by over one half compared with PAC and by over 20 percent compared with PASS, improves the chroma removal rate of the wastewater by about 10 percent, has low processing cost, and improves the processing effect.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to flocculant technology, in particular to a composite flocculant and its preparation method and application. Background technique [0002] At present, there are many kinds of coagulants used in wastewater treatment. Among them, inorganic polymer flocculants not only have the effect of adsorption and destabilization, but also can play the role of adhesion, bridging and sweeping flocculation, so they are widely used. [0003] There are also many reports in the literature about coagulants. For example, Chinese patent CN1394815A discloses a rare earth composite coagulant for wastewater treatment, which is made of mixed rare earth oxide (mainly composed of lanthanum, cerium, praseodymium, and neodymium) and liquid polyaluminum chloride, and is used for printing and dyeing. For wastewater treatment, the coagulation effect is better than that of polyaluminum chloride; the pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 袁斌吕松欧少清
Owner GUANGDONG UNIV OF TECH
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