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A kind of use method of tryptophan-polyacrylamide composite flocculant

A polyacrylamide and composite flocculant technology, applied in the field of environmental engineering, can solve problems such as difficult to achieve high-efficiency solid-liquid separation, poor effluent quality, poor sedimentation separation performance, etc., achieve mild use conditions, reduce toxicity, and improve sedimentation performance Effect

Active Publication Date: 2016-01-13
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The sludge produced in the process of heavy metal wastewater treatment is generally flocculent, and its sedimentation and separation performance is poor, and the sedimentation rate is often less than 1cm / s. It is difficult to achieve the purpose of efficient solid-liquid separation, which will eventually lead to poor water quality.

Method used

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  • A kind of use method of tryptophan-polyacrylamide composite flocculant
  • A kind of use method of tryptophan-polyacrylamide composite flocculant

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Prepare an aqueous solution of tryptophan with a concentration of 1 g / L in a container, and prepare an aqueous solution of polyacrylamide with a concentration of 1 g / L in another container. Then the two aqueous solutions are mixed according to the weight ratio of tryptophan / polyacrylamide as 1 / 16, 1 / 8, 1 / 4, 1 / 2, 1, 2, 4, and after uniform stirring, the implementation Example 1 for a series of different proportions of flocculants.

[0015] A reaction beaker was placed on a constant temperature magnetic stirring device, and 100 mL of a suspension containing nano-ZnO seed crystal material (solid concentration 1.5 g / L) was added thereto. The reaction temperature is controlled at 25±1° C., and the rotating speed of the magnetic stirring bar is adjusted at 500-600 rpm. Add dropwise sodium hydroxide solution (0.015mol / L) and zinc-containing waste water (1000mg / L) respectively in the beaker at the same time, control the drop rate of heavy metal waste water at 1.5mL / min, by adj...

Embodiment 2

[0017] Prepare an aqueous solution of tryptophan with a concentration of 1 g / L in a container, and prepare an aqueous solution of polyacrylamide with a concentration of 1 g / L in another container. Then the two aqueous solutions were mixed according to the weight ratio of tryptophan / polyacrylamide as 8:1, and after uniform stirring, the flocculant in Example 2 was obtained.

[0018] A reaction beaker was placed on a constant temperature magnetic stirring device, and 100 mL of a suspension containing nano-ZnO seed crystal material (solid concentration 1.5 g / L) was added thereto. The reaction temperature is controlled at 25±1° C., and the rotating speed of the magnetic stirring bar is adjusted at 500-600 rpm. Add dropwise sodium hydroxide solution (0.015mol / L) and zinc-containing waste water (1000mg / L) respectively in the beaker at the same time, control the drop rate of heavy metal waste water at 1.5mL / min, by adjusting the drop rate of precipitant sodium hydroxide solution Acc...

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Abstract

The invention relates to a tryptophan-polyacrylamide composite flocculant and a usage method thereof. The flocculant is prepared by compounding tryptophan and polyacrylamide, the weight ratio of m (tryptophan) / m(polyacrylamide) is less than or equal to 8, the optimal ratio is one half, the concentration of the flocculant in addition to the system is controlled to 5-40mg / L, preferably 5mg / L. The flocculant combines the hydrophobic attraction action of tryptophan and bridging attraction action of polyacrylamide, and the formation of non-biological particle sludge during treatment of heavy metal waste water can be effectively promoted. The highest settling speed of the non-biological particle sludge can reach 4.6cm / s which is far higher than that of the common particle sludge. By using the flocculant, the problem that the solid-liquid separation during treatment of heavy metal waste water can be overcome, the usage amount of the organically synthesized high-molecular flocculant can be obviously reduced, and the flocculant is more environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and specifically relates to a tryptophan-polyacrylamide composite flocculant and a use method thereof. Background technique [0002] The sludge produced in the process of heavy metal wastewater treatment is generally flocculent, and its sedimentation and separation performance is poor, and the sedimentation rate is often less than 1cm / s. It is difficult to achieve the purpose of efficient solid-liquid separation, which will eventually lead to poor water quality. In order to improve the settling performance of sludge in the process of heavy metal wastewater treatment, the method of forming non-biological granular sludge in the process of heavy metal wastewater treatment can greatly improve the sludge settling performance. [0003] During the formation of non-biological granular sludge, the addition of flocculant is one of the key factors that determine the size of the sludge and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/54
Inventor 李青竹柴立元颜旭王庆伟闵小波杨卫春王海鹰
Owner CENT SOUTH UNIV
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