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The method of chitosan modified clay and its application of algae removal technology

A technology of chitosan modification and chitosan solution, applied in the field of water treatment, can solve the problems of not considering the composite synergistic effect of micro-bubble modifiers, unsatisfactory algae removal effect, increasing floc density, etc., so as to shorten the coagulation time. time, increase the flocculation effect, reduce the effect of the dosage

Active Publication Date: 2021-07-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although the biological method has the advantages of no pollution, low consumption, and sustainability, it is not easy to be used as an emergency purification method; the common physical and chemical methods include air flotation or sedimentation separation after adding algaecide or coagulant, algaecide It is easy to cause secondary pollution, and conventional coagulants have poor algae removal effect, and the algae removal effect is not ideal
In recent years, clay has been mostly used to control algae in lakes, to increase the density of flocs to accelerate the sedimentation rate, or to modify clay only, without considering the composite synergistic effect of other microbubble modifiers

Method used

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  • The method of chitosan modified clay and its application of algae removal technology
  • The method of chitosan modified clay and its application of algae removal technology

Examples

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Comparison scheme
Effect test

Embodiment 1

[0038] A modified diatomite and polyaluminum chloride composite coagulant, which is prepared from chitosan solution and diatomite and then compounded with polyaluminum chloride

[0039]The compound method of described chitosan solution is as follows: first measure mass concentration and be 5% hydrochloric acid 10mL, add reactor, under the situation of constantly stirring, add 200mg chitosan again, dissolve and add distilled water and be diluted to 100ml, at temperature The reaction time was stirred at 30°C for 0.5 hour to obtain a dilute chitosan hydrochloric acid solution with a chitosan concentration of 2 mg / mL.

[0040] Chitosan dilute hydrochloric acid solution modified diatomite according to the mass ratio of 1:5. Modified diatomaceous earth and polyaluminum chloride are compounded at a mass ratio of 1:2, with a total dosage of 60mg / L; cetyltrimethylammonium bromide dosage of 1mg / L. The coagulation time is 2min; the reflux ratio of dissolved air and water is 30%; the sep...

Embodiment 2

[0045] A modified kaolin and polyferric sulfate composite coagulant, which is prepared from chitosan solution and kaolin and then compounded with polyaluminum sulfate

[0046] The compound method of described chitosan solution is as follows: first measure mass concentration and be 10mL of hydrochloric acid of 1%, add reactor, under the situation of constantly stirring, add 20mg chitosan again, dissolve and add distilled water and dilute to 100ml, at temperature The reaction time was stirred at 15° C. for 1.5 hours to obtain a dilute chitosan hydrochloric acid solution with a chitosan concentration of 0.2 mg / mL.

[0047] Chitosan dilute hydrochloric acid solution modified kaolin at a mass ratio of 1:20. Modified kaolin and polyferric sulfate are compounded at a mass ratio of 1:1, the total dosage is 20mg / L; the dosage of cetyltrimethylammonium bromide is 0.5mg / L. The coagulation time is 4 minutes; the reflux ratio of dissolved air and water is 20%; the separation time in the s...

Embodiment 3

[0052] A modified diatomite and polyferric sulfate composite coagulant, which is prepared from chitosan solution and diatomite and then compounded with polyferric sulfate

[0053] The preparation method of described chitosan solution is as follows: at first measure mass concentration and be 10mL of hydrochloric acid of 2%, add reactor, under the situation of constantly stirring, add 100mg chitosan again, dissolve and add distilled water and be diluted to 100ml, at temperature The reaction time was stirred at 20° C. for 1.0 hour to obtain a dilute chitosan hydrochloric acid solution with a chitosan concentration of 1 mg / mL.

[0054] Diatomite was modified by dilute chitosan hydrochloric acid solution at a mass ratio of 1:40. Modified diatomaceous earth and polyferric sulfate are compounded at a mass ratio of 2:1, with a total dosage of 40mg / L; cetyltrimethylammonium bromide dosage of 1mg / L. The coagulation time is 4 minutes; the reflux ratio of dissolved air and water is 30%; ...

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Abstract

The invention discloses a chitosan-modified clay method and its application in algae removal technology; the clay is modified with 0.2-2 mg / mL dilute acid chitosan solution, and the modified clay and traditional coagulant are in a mass ratio of 1 :2~2:1 compounding, by adding cationic surfactants to increase the stability of dissolved air water bubbles and enhance the hydrophobicity of algae, the components of several agents are compounded with each other to produce a synergistic effect. The composite coagulant of the invention has fast flocculation speed, strong adsorption bridging ability and low cost, and does not contain harmful components to human body. The modified clay and coagulant prepared in the previous stage are compounded and added, and the surfactant is added under stirring, and most of the algae in the water are removed through the dissolved air flotation device. After the raw water is dosed, the dissolved air flotation method is used for solid-liquid separation, and the content of chlorophyll a (Chl‑a) can be reduced to 5 μg / L, and the removal rate can reach more than 95%.

Description

technical field [0001] The invention belongs to the field of water treatment, specifically relates to algae-containing water treatment, relates to clay modification, preparation of a composite coagulant and a method for its application in algae removal, and is suitable for algae removal in urban water bodies using small algae species such as cyanobacteria. Background technique [0002] Affected by economic factors, urban planning concepts and other historical reasons, most urban drainage pipes in my country belong to the combined system, and the drainage system designed as a separate system often has a high probability of mixing rainwater pipes and sewage pipes due to low construction levels. During the rainy season, after the heavy rain, the initial rainwater mixed with domestic sewage is discharged into the urban river, and the untreated overflow pollution causes serious damage to the water environment of the receiving water body. With eutrophication, the risk of algal blo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/56
CPCC02F1/24C02F1/281C02F1/286C02F1/5236C02F1/5263C02F1/56
Inventor 季民田壮王灿肖岭
Owner TIANJIN UNIV
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