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Method for treating sewage by using cationic surfactant and electric flocculation

A technology of surfactants and cations, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of long treatment time and hinder the rapid development of sewage treatment, and shorten the reaction time , Improve the floating efficiency of flocs and improve the efficiency of sewage treatment

Inactive Publication Date: 2014-10-08
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of the electrocoagulation method in the prior art is that the treatment time is long, which is also one of the important reasons hindering the rapid development of the electrocoagulation method for sewage treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A cationic surfactant-electrocoagulation method for sewage treatment, comprising the steps of:

[0016] (1) putting the cationic surfactant cetyltrimethylammonium bromide into an appropriate amount of water to dissolve to obtain a mixed solution;

[0017] (2) Add the mixed solution to the sewage so that the concentration of cetyltrimethylammonium bromide is 0.05g / L; add sodium chloride to make the concentration 1g / L, at 20°C, the initial pH is 7, The stirring speed is 250r / min, the electrode is pure aluminum electrode, the distance between the plates is 1.0cm, and the current density is 1.07A / m 2 , for electrocoagulation reaction.

[0018] Comparative Experiment:

[0019] Add sodium chloride to the sewage to make the concentration 1g / L. At 20℃, the initial pH is 7, the stirring speed is 250r / min, the electrode is pure aluminum electrode, the distance between the plates is 1.0cm, and the current density is 1.07A / m 2 , for electrocoagulation reaction.

[0020] The s...

Embodiment 2

[0023] A cationic surfactant-electrocoagulation method for sewage treatment, comprising the steps of:

[0024] (1) putting the cationic surfactant dodecyltrimethylammonium chloride into an appropriate amount of water to dissolve to obtain a mixed solution;

[0025] (2) Add the mixed solution to the sewage so that the concentration of dodecyltrimethylammonium chloride is 0.5g / L; add sodium chloride to make the concentration 0.5g / L, at 25°C, the initial pH is 6.5 , the stirring speed is 200r / min, the electrode is pure aluminum electrode, the distance between the plates is 0.5cm, and the current density is 6.38A / m 2 , for electrocoagulation reaction.

[0026] Comparative Experiment:

[0027] Add sodium chloride to the sewage to make the concentration 0.5g / L, at 25°C, the initial pH is 6.5, the stirring speed is 200r / min, the electrode is pure aluminum electrode, the distance between the plates is 0.5cm, and the current density is 6.38A / m 2 , for electrocoagulation reaction. ...

Embodiment 3

[0031] A cationic surfactant-electrocoagulation method for sewage treatment, comprising the steps of:

[0032] (1) putting cationic surfactant lauryl dimethyl benzyl ammonium chloride into an appropriate amount of water to dissolve to obtain a mixed solution;

[0033] (2) Add the mixed solution to the sewage so that the concentration of dodecyldimethylbenzyl ammonium chloride is 0.1g / L; add sodium chloride to make the concentration 1.5g / L, at 25°C and initial pH 7.5, the stirring speed is 300r / min, the electrode is pure aluminum electrode, the distance between the plates is 2.0cm, and the current density is 8.52A A / m 2 , for electrocoagulation reaction.

[0034] Comparative Experiment:

[0035] Add sodium chloride to the sewage to make the concentration 1.5g / L, at 25°C, the initial pH is 7.5, the stirring speed is 300r / min, the electrode is pure aluminum electrode, the distance between the plates is 2.0cm, and the current density is 8.52A / m 2 , for electrocoagulation reac...

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PUM

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Abstract

The invention discloses a method for treating sewage by using cationic surfactant and electric flocculation. The method comprises the following steps of (1) dissolving a cationic surfactant into a proper amount of water to obtain a mixed solution; (2) adding the mixed solution into sewage to enable the concentration of the surfactant to be up to 0.05-0.5g / L; and adding sodium chloride, and carrying out electric flocculation reaction under the conditions that the temperature is 20-25 DEG C, the initial pH value is 6.5-7.5, the stirring speed is 200-300r / min, a pure aluminum electrode is adopted, the distance between polar plates is 0.5-2.0cm and the current density is 1.07-8.52A / m<2>. By using the method, the sewage treating efficiency is remarkably improved. Compared with the traditional electric flocculation technology, the method has the advantage that the bubbles of hydrogen generated in the reaction process are smaller, closer and more stable after the cationic surfactant is added, so that the floating efficiency of flocs can be favorably improved. The sludge on the upper layer is denser. The reaction time is shortened under the condition of same removal rate.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a cationic surfactant-electrocoagulation treatment sewage treatment method. Background technique [0002] Eutrophication of water bodies is a worldwide problem, and phosphate in water bodies is one of the important indicators of eutrophication in water bodies. Heavy metal pollution in water will cause serious harm to human health. Unlike many pollutants that can be purified by nature itself, heavy metals in water will be enriched in the food chain and are difficult to degrade in the environment. [0003] Traditional phosphorus removal methods include chemical, physical and biological methods, especially the method of chemical coagulation to remove phosphate is widely used. At present, the methods for treating heavy metals in wastewater are physical methods, chemical precipitation methods and biological methods, especially chemical precipitation methods are widely used. [0004] The ...

Claims

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Application Information

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IPC IPC(8): C02F1/463
Inventor 骆尚廉李爽孙力平邱春生钟远
Owner TIANJIN CHENGJIAN UNIV
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