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PAC-PAM composite flocculant, preparation method of PAC-PAM composite flocculant and application of PAC-PAM composite flocculant to reduce COD in domestic sewage

A composite flocculant and domestic sewage technology, applied in flocculation/sedimentation water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of not being able to use on a large scale, high cost, and high price , to achieve the effect of improving flocculation treatment capacity, fast settlement and good removal effect

Inactive Publication Date: 2019-05-17
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it has the advantages of less dosage, fast flocculation speed, and little influence by pH value and temperature. It has been widely used in water treatment in recent years and achieved good results, but its price is relatively high and the cost is high. large scale use

Method used

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  • PAC-PAM composite flocculant, preparation method of PAC-PAM composite flocculant and application of PAC-PAM composite flocculant to reduce COD in domestic sewage
  • PAC-PAM composite flocculant, preparation method of PAC-PAM composite flocculant and application of PAC-PAM composite flocculant to reduce COD in domestic sewage
  • PAC-PAM composite flocculant, preparation method of PAC-PAM composite flocculant and application of PAC-PAM composite flocculant to reduce COD in domestic sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation of PAC-PAM composite flocculant

[0025] 1. PAC solid pretreatment:

[0026] The oven temperature was set to 200°C, and the PAC solid was dried in the oven for 20 minutes.

[0027] 2. PAM solid pretreatment:

[0028] The oven temperature was set to 200° C., and the PAM solid was dried in the oven for 20 minutes.

[0029] 3. Preparation of PAC-PAM composite flocculant:

[0030] 1) According to the mass ratio, PAC solid: PAM solid = 10:1, take PAC solid and PAM solid respectively

[0031] 2) Dissolving the PAC solid obtained in step 1) in water to prepare a 1‰ PAC aqueous solution;

[0032] 3) adjust the pH of the PAC solution with 0.5mol / L sodium hydroxide solution, and adjust the pH value of the solution to 7;

[0033] 4) Put the PAM solid obtained in step 1) into a beaker, add distilled water, and prepare a 2% PAM aqueous solution;

[0034] 5) adjust the pH of the PAM solution with 3mol / L dilute hydrochloric acid solution, and adjust the pH ...

Embodiment 2

[0035] Example 2 Application of PAC-PAM composite flocculant in reducing domestic sewage COD

[0036] To 100mL of domestic sewage with a COD of 350mg / L, 1g of the PAC aqueous solution and 0.005g of the PAM aqueous solution prepared in Example 1 were sequentially added, stirred, and precipitated for 20min. The COD was measured to be 297mg / L. Such as image 3 As shown, the water quality of the treated domestic sewage has improved significantly.

Embodiment 3

[0037] Example 3 Determination of the optimum conditions for the composite flocculant in the preparation process

[0038] 1. pH determination

[0039] Dry PAC solids and PAM solids respectively, and take 5 parts of PAC solids and 5 parts of PAM solids in a mass ratio of 10:1. Dissolve 5 parts of PAC solid in water respectively to prepare 1‰ PAC aqueous solution; adjust the pH of 5 parts of PAC aqueous solution to 5, 6, 7, 8, 9 respectively. Dissolve 5 parts of PAM solid in water respectively to prepare 2% PAM solution, and adjust the pH of 5 parts of PAM solution to 5, 6, 7, 8 and 9 respectively.

[0040] Take 5 parts of 100mL domestic sewage and pour them into beakers respectively, add 1g PAC solution and 0.005g PAM solution corresponding to the pH respectively, stir at 300r / min for 20min, flocculate and settle at room temperature for 20min, measure the COD of domestic sewage before and after treatment, And calculate the COD removal rate.

[0041] The result is as figure ...

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Abstract

The invention relates to a PAC-PAM composite flocculant, a preparation method of the PAC-PAM composite flocculant and application of the PAC-PAM composite flocculant to reduce COD in domestic sewage,and belongs to the technical field of sewage treatment. The preparation method comprises the following steps that (1) PAC solid and PAM solid are dried; the PAC solid and the PAM solid are taken according to a mass ratio of (5 to 40):1; (2) a PAC water solution is prepared; the pH value of the PAC water solution is regulated; (3) a PAM water solution is prepared; the pH value of the PAM water solution is regulated. In the use process, the PAC water solution is firstly fed into the domestic sewage; then, the PAM water solution is fed; two kinds of flocculants are compounded and used; the high positive charge density of inorganic flocculants and the bridging effect of organic macromolecule flocculants are used, so that the two kinds of flocculants achieve a synergic effect; the advantages ofPAC and PAM are fully exerted, so that the flocculant treatment capability is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of flocculants and wastewater treatment, and in particular relates to a PAC-PAM composite flocculant, a preparation method thereof and an application in reducing domestic sewage COD. Background technique [0002] Polyaluminum chloride (PAC) is a new type of high-efficiency inorganic polymer flocculant, which has the advantages of fast formation of flocs, large alum flowers, and good turbidity removal effect. Ligands, mononuclear and multinuclear coordination compounds with chloride ions as counter ions. Compared with traditional medicines, it has the advantages of strong adaptability, non-toxicity, multiplied performance and relatively low price, so it has been rapidly developed and widely used in recent years. However, when this type of flocculant is used, there are disadvantages such as low molecular weight, poor stability in water, high dosage, and small flocs produced, which will make the effect of trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F11/148C02F103/28
Inventor 包红旭宋泽斌吕志忠李良玉张欣苏弘治杨雨萌张馨月吴洁婷金楠珣
Owner LIAONING UNIVERSITY
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