Preparation method of high polymeric polyalumnium sulfa coagulant for strengthening coagulation of drinking water

A technology of polysulfide aluminum chloride and coagulant, which is applied in the direction of aluminum sulfur compound, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of increasing the operation cost of water treatment, increasing the amount of sludge and water treatment agent residue, etc., to achieve Good application prospects, improved coagulation efficiency, simple process effect

Inactive Publication Date: 2010-07-07
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

However, controlling pH and increasing the dosage of coagulant will not only increase the operating cost of water treatment, but also increase the amount of sludge and water treatment agent residues, so the development of highly efficient and low-residue coagulants is particularly important for enhanced coagulation of drinking water

Method used

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  • Preparation method of high polymeric polyalumnium sulfa coagulant for strengthening coagulation of drinking water
  • Preparation method of high polymeric polyalumnium sulfa coagulant for strengthening coagulation of drinking water
  • Preparation method of high polymeric polyalumnium sulfa coagulant for strengthening coagulation of drinking water

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Embodiment 1

[0015] Preparation of high polysulfide aluminum chloride coagulant: first AlCl 3 ·6H 2 O prepared into 0.4mol / L AlCl 3 solution, by SO 4 2- / Al 3+ Molar ratio 0.06 to AlCl 3 Add Na to the solution 2 SO 4 solid, and stirred to Na 2 SO 4 completely dissolved. Under the conditions of normal temperature, normal pressure and vigorous stirring, 0.4mol / L Na 2 CO 3 solution and containing Na 2 SO 4 0.4mol / L AlCl 3 The solution mixes quickly and controls the OH - / Al 3+ The molar ratio is 2.0, and the total aluminum concentration is 0.2 mol / L. Stir at a speed of 200r / min until the solution becomes a stable and transparent homogeneous solution. The obtained homogeneous solution was heated at a constant temperature of 95° C., stirred, and refluxed for 8 hours, and the stirring intensity was controlled to be 200 r / min. After natural cooling and aging at room temperature for 5 days, a high polysulfide aluminum chloride coagulant was obtained. The speciation distribution ...

Embodiment 2

[0021] Preparation of high polysulfide aluminum chloride coagulant: the difference between this embodiment and embodiment 1 is OH - / Al 3+ The molar ratio is controlled at 1.6, SO 4 2- / Al 3+ The molar ratio is controlled at 0.08, and other steps and parameters are the same as in Example 1.

[0022] Coagulant application: The high polysulfide aluminum chloride coagulant prepared by the above method is used to treat the high turbidity influent raw water of a waterworks in the south. The pH is not adjusted during the treatment process, and 0.1mmol / L high polysulfide aluminum chloride (with Al), first stirred rapidly at 200r / min for 2min, then stirred slowly at 30r / min for 15min, allowed to settle for 30min, and then took the supernatant for testing. Natural organic matter is measured by UV absorbance at 254nm 254 Said, DOC and turbidity were measured by Continental 1010 total carbon analyzer and WTW company Turb550 turbidity meter respectively, and the residual aluminum con...

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Abstract

The invention provides a preparation method of high polymeric polyalumnium sulfa coagulant, belonging to the water purification drug technical field; the preparation steps are as follows: Na2SO4 solid is added in AlCl3 solution according to 0.05-0.10 of mole ratio of SO42- / Al3+, the mixture is stirred and is dissolved completely; and then the mixture is rapidly mixed with Na2CO3 solution at normal temperature and normal pressure under strong mixing condition, the mole ratio of OH- / Al3+ is controlled to be 1.2-2.2, the total aluminum concentration is 0.2-0.4mol / L, so as to obtain the stable and transparent homogeneous phase polyalumnium sulfa solution; the homogeneous phase polyalumnium sulfa solution is heated at constant temperature from 95 to 105 DEG C, stirred and back-flows for 6-8h, and then cooling and aging are carried out to obtain the high polymeric polyalumnium sulfa coagulant. The high polymeric polyalumnium sulfa has high polymerization degree and strong stability and can remove turbidity and organic matters in the drinking water by strengthening coagulation, the water yielding quality is odiously improved and the invention has high application value.

Description

technical field [0001] The invention belongs to the technical field of water purification agents, and in particular relates to a preparation method and application of a novel high polysulfide aluminum chloride coagulant. The coagulant of the invention has high degree of polymerization and strong stability, can be applied to strengthen coagulation to remove turbidity and organic matter in drinking water, and can obviously improve the quality of effluent water. technical background [0002] Coagulation is one of the conventional water treatment methods. The goal of traditional coagulation is to effectively remove particulate matter in water and reduce turbidity of effluent. In recent years, it has been proposed to strengthen the coagulation process by adjusting the pH of raw water, increasing the dosage of coagulant, developing and using new high-performance coagulants, etc. Reduce the content of organic matter in the water while reducing the degree of substance, thereby red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/68C02F1/52
Inventor 张盼月吴珍张光明曾光明
Owner BEIJING FORESTRY UNIVERSITY
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