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Composite flocculant and method for treating sewage by using flocculant

A composite flocculant and sewage technology, which can be used in flocculation/sedimentation water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. To achieve the effect of no secondary pollution, less dosage and convenient treatment

Active Publication Date: 2019-12-06
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polluted water bodies become complicated after confluence, and the requirements for sewage treatment are higher and more cumbersome. Improper treatment may easily cause secondary pollution. Therefore, it is urgent to develop a high-efficiency, excellent flocculation performance, low cost, and suitable for Flocculant for mixed sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: a kind of composite flocculant, the composition and consumption of described composite flocculant are respectively:

[0033] Chemically modified natural polymer: 0.01mg / mL;

[0034] Polyvinyl alcohol: 0mg / mL;

[0035] Flocculation accelerator: 0.001mg / mL;

[0036] Wherein, the chemically modified natural polymer is chitosan, and the chitosan comes from industrial deacetylated chitin, its degree of deacetylation is not less than 70%, and its molecular weight range is 2×10 5 ~5×10 5 ; The flocculation accelerator is borax.

[0037] Adopt the method for above-mentioned composite flocculant treatment sewage, it may further comprise the steps:

[0038] S1. The mixed sewage is printing and dyeing wastewater and turbid mud slurry, and the measured amount of Escherichia coli is 3.2×10 5 pcs / L, add chemically modified natural polymers to the mixed sewage to make the composite flocculant reach the required concentration in the sewage;

[0039] S2. Further add ...

Embodiment 2

[0041] Embodiment 2: a kind of composite flocculant, the composition and consumption of described composite flocculant are respectively:

[0042] Chemically modified natural polymer: 100mg / mL;

[0043] Polyvinyl alcohol: 100mg / mL;

[0044] Flocculation accelerator: 10mg / mL;

[0045] Wherein, the chemically modified natural polymer is cationic starch, and the cationic starch is derived from corn, and its cationic substitution degree after cationic modification is 0.2-0.8; the flocculation accelerator is boric acid and pentadiene Combination of aldehydes.

[0046] Adopt the method for above-mentioned composite flocculant treatment sewage, it may further comprise the steps:

[0047] S1. The mixed sewage is turbid mud slurry and domestic sewage, and the measured Escherichia coli is 6.5×10 5 pcs / L, add chemically modified natural polymers and polyvinyl alcohol to the mixed sewage to make the composite flocculant reach the required concentration in the sewage;

[0048] S2. Furt...

Embodiment 3

[0050] Embodiment 3: a kind of composite flocculant, the composition and consumption of described composite flocculant are respectively:

[0051] Chemically modified natural polymer: 0.1mg / mL;

[0052] Polyvinyl alcohol: 10mg / mL;

[0053] Flocculation accelerator: 0.01mg / mL;

[0054] Wherein, the chemically modified natural polymer is chitosan and cationized starch, and the chitosan comes from industrial deacetylated chitin, the degree of deacetylation is not less than 70%, and the molecular weight range is 2×10 5 ~5×10 5 The cationized starch is derived from potatoes, and its cationized substitution degree is 0.2-0.8 after cationized modification; the flocculation accelerator is a combination of borax, boric acid and glutaraldehyde.

[0055] Adopt the method for above-mentioned composite flocculant treatment sewage, it may further comprise the steps:

[0056] S1. The mixed sewage is printing and dyeing wastewater, turbid mud slurry and domestic sewage, and the measured Es...

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PUM

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Abstract

The invention discloses a composite flocculant and a method for treating sewage by using the flocculant. The composite flocculant consists of a chemically modified natural polymer, polyvinyl alcohol and a flocculation accelerator. The composite flocculant disclosed by the invention has a good flocculating effect on mixed sewage, especially has an obvious purifying effect on mixed sewage formed byany two or three of printing and dyeing wastewater, turbid silt slurry and domestic sewage, and has effects of low use amount, low price, no secondary pollution, high efficiency and sterilization. Experiments prove that the turbidity of discharged clear liquid treated by the composite flocculant is lower than that of wastewater by 85-97%, the COD removal rate is 80-97%, and the sterilization rateis 35-50%, and the method for treating the mixed sewage disclosed by the invention is simple to operate, convenient to treat, low in cost and suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a composite flocculant and a method for treating sewage by using the flocculant. Background technique [0002] my country's economic development mode has entered a critical period of transformation and upgrading, and environmental protection requirements have become increasingly stringent. However, many industrial sectors, such as paper, sugar, alcohol, starch, monosodium glutamate, tanning, and food industries will produce high-concentration organic sewage in the production process. Other sectors, such as printing and dyeing, electroplating, petrochemical, smelting, etc. also produce a large amount of wastewater. At the same time, with the expansion of cities, the pollution of sewage from medical institutions, urban domestic sewage, and aquaculture wastewater is also very serious, and the pathogenic bacteria contained in them have caused people to be highly concerned. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/54C02F1/52
CPCC02F1/5236C02F1/54C02F1/56
Inventor 廖望高建领赖舒雁龙鑫磊
Owner XIHUA UNIV
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