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A coagulation method for low-temperature turbid water

A turbid water and low temperature technology, applied in the field of coagulation of low temperature turbid water, can solve the problems of low coagulation efficiency and poor purification effect, and achieve the effect of low sediment output, strong applicability and enhanced stability

Active Publication Date: 2020-09-29
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of low coagulation efficiency and poor purification effect of the existing coagulation method when dealing with low-temperature turbid water, and to provide a coagulation method for low-temperature turbid water

Method used

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  • A coagulation method for low-temperature turbid water
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  • A coagulation method for low-temperature turbid water

Examples

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Effect test

Embodiment 1

[0028] A kind of coagulation method of low-temperature turbid water in the present embodiment, comprises the following steps:

[0029] 1) Prepare a PAM solution with a mass concentration of 0.05%, and the molecular weight of the PAM is more than 3 million;

[0030] 2) Prepare 0.1mol / L ferrous sulfate solution and 0.5mol / L sodium silicate solution, adjust the pH of the sodium silicate solution to 6.0 with concentrated sulfuric acid, and add the above-mentioned ferrous sulfate solution to the above-mentioned sodium silicate solution In the mixed solution, the molar ratio of iron and silicon in the mixed solution is 1:100, and after stirring and aging for 1 to 2 hours, ferrous activated silicic acid is obtained;

[0031] 3) preparation of ferric ion concentration is the polyferric sulfate solution of 0.1mol / L, the degree of alkalinity B=0.5 of the polyferric sulfate solution;

[0032] 4) Take the water of a local lake at 2-5°C as the raw water to be treated, add the PAM solution...

Embodiment 2

[0039] A kind of coagulation method of low-temperature turbid water in the present embodiment, comprises the following steps:

[0040] 1) Prepare a PAM solution with a mass concentration of 0.25%, and the molecular weight of the PAM is more than 3 million;

[0041] 2) Prepare 0.5mol / L ferrous sulfate solution and 1mol / L sodium silicate solution, adjust the pH of the sodium silicate solution to 6.5 with concentrated sulfuric acid, and add the above-mentioned ferrous sulfate solution to the above-mentioned sodium silicate solution , so that the molar ratio of iron and silicon in the mixed solution is 1:300, after stirring and aging for 1 to 2 hours, ferrous activated silicic acid is obtained;

[0042] 3) preparation of ferric ion concentration is the polyferric sulfate solution of 0.5mol / L, the degree of alkalization B=1.0 of the polyferric sulfate solution;

[0043] 4) Select domestic sewage from a community, and after sampling, put the water sample in a freezer at 1°C and sto...

Embodiment 3

[0049] A kind of coagulation method of low-temperature turbid water in the present embodiment, comprises the following steps:

[0050] 1) Prepare a PAM solution with a mass concentration of 0.5%, and the molecular weight of the PAM is more than 3 million;

[0051] 2) Prepare ferrous sulfate solution of 1.0mol / L and sodium silicate solution of 0.1mol / L, adjust the pH of the sodium silicate solution to 6.8 with concentrated sulfuric acid, and add the above-mentioned ferrous sulfate solution to the above-mentioned sodium silicate solution In the mixed solution, the molar ratio of iron and silicon in the mixed solution is 1:200, and after stirring and aging for 1 to 2 hours, ferrous activated silicic acid is obtained;

[0052] 3) preparation of ferric ion concentration is the polyferric sulfate solution of 1mol / L, the degree of alkalinity B=1.5 of the polyferric sulfate solution;

[0053] 4) Select the domestic sewage of a residential area in Jincheng as the raw water to be treat...

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Abstract

The invention relates to a coagulation method for low-temperature turbid water. The objective of the invention is to solve the technical problem that the efficiency of coagulation is low and the purification effect is poor when low-temperature water is treated by a conventional coagulation method. The technical solution of the invention is as follows: (1) PAM (polyacrylamide) solution, the mass concentration of which is 0.05 to 0.5 percent, is prepared; ferrous sulfate solution and sodium silicate solution, the concentrations of which are all 0.1mol / L to 1.0mol / L, are prepared, the ferrous sulfate solution is added into the sodium silicate solution, and after stirring and curing, ferrous activated silicic acid is obtained; and polyferric sulfate solution, the iron ion concentration of which is 0.1mol / L to 1mol / L, is prepared; (2) the PAM solution is added into low-temperature turbid water to be treated, the ferrous activated silicic acid prepared in step (2) is added between 30 seconds and 60 seconds, the polyferric sulfate solution prepared in step (3) is added after 30 seconds, rapid stirring is continued for 1 minute, slow stirring for flocculation is then carried out for 5 to 10 minutes, precipitation is carried out for 2 to 3 minute, and thereby coagulation treatment on the low-temperature turbid water is finished.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a coagulation method for low-temperature turbid water. Background technique [0002] Coagulation is currently an important method for most waterworks and sewage treatment plants to remove pollution and improve water quality. The coagulation effect has a profound impact on downstream processes such as sedimentation, filtration, disinfection, membrane treatment and even biological treatment. Temperature has a great influence on the coagulation process. The coagulation efficiency is generally higher at room temperature (15-30°C), but the coagulation efficiency will decrease when the temperature decreases. When the temperature drops below 10 °C, the coagulation efficiency is severely inhibited, the flocs form slowly, the structure is loose, and it is not easy to settle and separate, and the removal rate of organic matter is also weakened. Therefore, the low temperature lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56
CPCC02F1/5236C02F1/56C02F2301/08
Inventor 刘海龙任宇霞
Owner SHANXI UNIV
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