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Composite flocculant and preparation and application in surface water treatment thereof

A composite flocculant and surface water technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of unsatisfactory treatment effect, secondary pollution of aluminum ions, corrosion of equipment, etc., and achieve excellent treatment effect and good treatment effect. , Easy to operate effect

Inactive Publication Date: 2013-01-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic flocculants have a great advantage in water treatment because of their low price and sufficient supply. However, due to excessive use, aluminum ions remaining in water will cause secondary pollution. What is more serious is that people who drink Al3+, The proportion of suffering from Alzheimer's disease is relatively high; while iron ions are colored and have a corrosive effect on equipment, the dosage is large, the treatment effect is not ideal, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 5 grams of aluminum sulfate, 2 grams of ferric chloride, 3 grams of diatomaceous earth, and 0.07 grams of potassium permanganate and dissolve them in 1 liter of deionized water to obtain an aqueous solution of each component; Each 10 milliliters of the aqueous solution that divides is mixed, obtains composite flocculant;

[0023] (2) Use 10% sulfuric acid to adjust the pH value of 1 liter of surface water to 6.5, then add the composite flocculant obtained in step (1), and stir thoroughly for 10 minutes. With the stirring, a large number of floc particles are produced, and the floc particles become Large, let it stand for 15 minutes, take the supernatant to measure the turbidity with a turbidimeter, and use the acidic potassium permanganate method to measure COD. After the measurement, the turbidity removal rate is calculated to be 95.1%, and the COD removal rate is 41.3%.

Embodiment 2

[0025] (1) Weigh 5 grams of aluminum sulfate, 2 grams of ferric chloride, 3 grams of diatomaceous earth, and 0.07 grams of potassium permanganate and dissolve them in 1 liter of deionized water to obtain an aqueous solution of each component; Each 10 milliliters of the aqueous solution that divides is mixed, obtains composite flocculant;

[0026] (2) Adjust the pH value of 1 liter of surface water to 7.0, then add the composite flocculant obtained in step (1), and stir thoroughly for 10 minutes. With stirring, a large number of floc particles will be produced, and the floc particles will become larger. Let stand for 15 minutes. Minutes, the supernatant was taken to measure the turbidity with a turbidimeter, and the acidic potassium permanganate method was used to measure the COD. After the measurement, the turbidity removal rate was calculated to be 95.0%, and the COD removal rate was 40.2%.

Embodiment 3

[0028] (1) Weigh 5 grams of aluminum sulfate, 2 grams of ferric chloride, 3 grams of diatomaceous earth, and 0.07 grams of potassium permanganate and dissolve them in 1 liter of deionized water to obtain an aqueous solution of each component; Each 10 milliliters of the aqueous solution that divides is mixed, obtains composite flocculant;

[0029] (2) Adjust the pH value of 1 liter of surface water to 6.7, then add the composite flocculant obtained in step (1), and stir thoroughly for 10 minutes. With stirring, a large number of floc particles will be produced, and the floc particles will become larger. Let stand for 15 minutes. Minutes, the supernatant was taken to measure the turbidity with a turbidimeter, and the acidic potassium permanganate method was used to measure the COD. After the measurement, the turbidity removal rate was calculated to be 97.6%, and the COD removal rate was 41.8%.

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Abstract

The invention relates to a composite flocculant and preparation and an application in surface water treatment thereof. The composite flocculant comprises the following components: aluminum sulfate, ferric chloride, diatomite and potassium permanganate, wherein the mass ratio of the aluminum sulfate, the ferric chloride, the diatomite and the potassium permanganate is 5:2:2.5-3.5:0.06-0.08. A preparation method comprises the following steps: respectively dissolving the aluminum sulfate, the ferric chloride, the diatomite and the potassium permanganate in water to prepare solution and obtain aqueous solution of all the components; and then mixing the aqueous solution of all the components according to the mass ratio of the aluminum sulfate, the ferric chloride, the diatomite and the potassium permanganate of 5:2:2.5-3.5:0.06-0.08 to obtain the composite flocculant. The composite flocculant provided by the invention can be used for treating meta-acid water quality with the pH value of 6.5-7.0, and is good in treatment effect and high in ecological security without secondary pollution. Moreover, the preparation method provided by the invention is simple, easy to operate and low in cost.

Description

technical field [0001] The invention belongs to the field of water treatment inorganic flocculant and its preparation and application, in particular to a composite flocculant and its preparation and application in surface water treatment. Background technique [0002] With the development of science and technology and the intensification of industrialization, the living standards of human beings are constantly improving, but at the same time the consumption of water resources is increasing day by day. Water is an indispensable resource for human survival and development, and the development of sewage treatment technology is particularly important. As one of the important unit operations of water treatment, the flocculation-sedimentation method has been widely used in water treatment. It can be seen that the continuous development of flocculants plays a vital role in water treatment. [0003] At present, the world's water treatment chemicals are tending to develop in the dir...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 林杰薛罡高品刘亚男郑博何势王珏胡丽霞任金涛李侃竹吴立乐
Owner DONGHUA UNIV
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