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Preparation method of modified elm bark flocculant

A technology of elm bark and flocculants, which is applied in the field of preparation of modified elm bark flocculants, can solve the problems of poor electrical neutralization, difficulty, and difficulty in storage, and achieve resource and energy saving, good safety, and raw material saving cost effect

Inactive Publication Date: 2012-03-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Elm bark is rich in cellulose, polysaccharides, lignin, and tannins, among which polysaccharides have a relatively high molecular weight, with an average molecular weight of 600,000-2 million, which has the function of adsorption and bridging, and can remove turbidity It is separated from solid and liquid, but the neutralization effect is poor, and it is not easy to preserve; while cellulose, lignin and tannin also have relatively high molecular weight (above 2600), but contain more carboxyl groups to associate hydrogen bonds with each other, so that Molecular chains are tightly combined, not easily soluble in water without flocculation

Method used

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  • Preparation method of modified elm bark flocculant
  • Preparation method of modified elm bark flocculant
  • Preparation method of modified elm bark flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) get 1000kg fresh elm bark, dry in the sun after exfoliating, grind through a 50 mesh sieve, get the elm bark fine powder with a moisture content of 5% by mass for subsequent use;

[0035] (2) Take by weighing 100g of elm bark fine powder with a moisture content of 5% and add it to a three-necked flask, moisten it with 150mL85% by mass alcohol, add 50mL of 10% by mass NaOH solution, insert a condensation reflux device, and React under stirring condition for 0.5h, obtain brown-red alkalized elm bark fine powder;

[0036] (3) Pour 20mL of industrial pure monochloroacetic acid into the reactor to make it etherify with the alkalized elm bark powder, and stir the reaction time at 70°C for 1h to obtain brown-red carboxymethylated elm bark powder, realizing Anion modification of elm bark fine powder;

[0037] (4) Add 1mL of 1% by mass cerium ammonium nitrate aqueous solution to the carboxymethylated elm bark fine powder in step (2), stir and activate, add 50g of acrylamide...

Embodiment 2

[0040] Take 6 250mL beakers, add 200mL of domestic sewage (COD218mg / L, TP4.2mg / L), add 0, 5, 10, 15, 20, 25ppm of the elm bark modified flocculant obtained in Example 1, and stir for 1min , stirred slowly for 14 minutes, and after settling for 30 minutes, take the supernatant to measure the COD and TP of the wastewater, see Table 1.

[0041] Table 1 The effect of the dosage of modified elm bark flocculant on the removal of domestic sewage

[0042]

[0043] It can be seen from Table 1 that COD and TP gradually increase with the increase of the dosage of modified elm bark flocculant. The removal does not have much impact, so it is determined that the best dosage for domestic sewage treatment is 20-25ppm.

Embodiment 3

[0045] Take 6 250mL beakers, add 200mL of landfill leachate, add 0, 10, 20, 30, 40, 50ppm of the elm bark modified flocculant obtained in Example 1, stir quickly for 1min, stir slowly for 14min, and take out after 30min of precipitation. See Table 2 for the COD of the waste water measured in the supernatant.

[0046] Table 2 Effect of modified flocculant dosage on leachate removal

[0047]

[0048] It can be seen from Table 1 that COD gradually increases with the increase of the dosage of modified flocculant. When the dosage exceeds 50ppm, the removal rate does not change much, indicating that the excess flocculant does not have much effect on the COD of wastewater. Therefore, it is determined that the optimal dosage of landfill leachate is 50ppm.

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Abstract

The invention relates to a preparation method of a modified elm bark flocculant. The preparation method comprises the following steps: drying elm bark, grinding, and screening through a 50-mesh screen to get elm bark fine powder; and further using 85% alcohol to moisten, then adding strong base, performing alkalization at the temperature of 30-50 DEG C for 0.5-2.5 hours, then adding monochloroacetic acid, performing etherification at the temperature of 40-70 DEG C for 0.5-3 hours, further adding ammonium ceric nitrate and acrylamide, performing polymerization at the temperature of 50-70 DEG Cfor 1-3 hours to prepare an elm bark flocculant crude product, finally performing reduced pressure distillation and recovering the alcohol to get the modified elm bark flocculant, wherein the weight ratio of elm bark fine powder to alcohol to strong base to monochloroacetic acid to ammonium ceric nitrate to acrylamide is 1:(0.5-2.5):(0.5-5):(0.1-1):(0.001-0.0001):(0.1-1). The flocculant is low inproduction cost and biodegradable, and can prevent secondary pollution of an environment; compared with a like product, the using amount is low, and the flocculant is suitable for various types of water quality and particularly suitable for treatment of domestic sewage with high mud content, landfill leachate, back purge effluent and mud discharged from various sedimentation tanks.

Description

technical field [0001] The invention relates to a preparation method of a modified elm bark flocculant, which belongs to a synthesis method of a natural organic polymer flocculant in a water treatment system. Background technique [0002] Organic polymer flocculants are divided into two categories: natural and synthetic. Natural polymer flocculants are mainly polyacrylamide flocculants, which have become the most widely used flocculants due to their large molecular weight, strong adsorption capacity, and good solid-liquid separation effect. The toxicity and refractory problems of this kind of flocculants are getting more and more attention. Natural polymer flocculants are favored for their advantages such as low cost and environmental friendliness, but they have small molecular weight and weak charge neutralization effect. Natural polymer flocculants with practical application value are chemically modified products, which can be divided into starch derivatives, cellulose d...

Claims

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Application Information

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IPC IPC(8): C08F291/06C08H8/00C02F1/56
Inventor 潘碌亭王文蕾蔡衍龙余波
Owner TONGJI UNIV
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