Method for treating viscose sludge by utilizing modified dextran

A technology of dextran and viscose fiber, which is applied in sludge treatment in viscose fiber water treatment and in the field of viscose fiber production, can solve the problems of high operating cost, difficulty in external transportation, water pollution, etc. The effect of stable operation and reduced operating costs

Pending Publication Date: 2021-02-19
唐山三友远达纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high operating costs, and the leachate in the sludge treatment process contains a high concentration of heavy metals, which is likely to pollute the water body; another method is to use calcium carbide slag or lime powder to increase the sludge skeleton during the treatment process to achieve Sludge effect, because calcium carbide slag or lime powder is highly alkaline, in order to ensure that the pH index of the mud cake after dehydration is strictly controlled within a certain range (pH2 SO 4 Resetting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The modified dextran plus produced water was configured to form a solution with a mass fraction of 0.5%, the stirring speed was controlled at 35 r / min, and the stirring time was 13 min.

[0033] Mix the pretreated sludge and activated sludge according to the volume ratio of 0.8:1, and the total volume is 80m 3, use a stirrer to stir and mix evenly, stirring speed: 25r / min. Stirring time is 15min. Add 1m by volume ratio 1.25% 3 Add the modified dextran solution and start stirring, the stirring speed is controlled at 30r / min, the modified dextran and the sludge particles undergo preliminary flocculation, and produce tiny alum flowers, after stirring for 10 minutes, the small alum flowers gather to produce larger alum flower particles And deposited down to produce mud-water stratification phenomenon, stop stirring.

[0034] The muddy-water mixture after the modified dextran treatment is dehydrated by pressing and dehydrating equipment. The pressing and dehydrating equip...

Embodiment 2

[0036] The modified dextran was added with production water to form a solution with a concentration of 0.8%, the stirring speed was controlled at 35 r / min, and the stirring time was 15 min.

[0037] Mix the pretreated sludge and activated sludge at a ratio of 1:1 by volume, and the total volume is 80m 3 , use a stirrer to stir and mix evenly, stirring speed: 25r / min. Stirring time is 15min. Add 1.6m by volume ratio 2.0% 3 Add modified dextran solution, start stirring, and control the stirring speed at 25r / min, the modified dextran and the sludge particles will undergo preliminary flocculation, and produce tiny alum flakes, after stirring for 12 minutes, the small alum flakes will gather to produce larger alum flake particles And deposited down to produce mud-water stratification phenomenon, stop stirring.

[0038] The muddy-water mixture treated with modified dextran is dehydrated by pressing and dehydrating equipment. The pressing and dehydrating equipment is a common plat...

Embodiment 3

[0040] The modified dextran plus production water was configured to form a solution with a concentration of 1%, the stirring speed was controlled at 35 r / min, and the stirring time was 17 min.

[0041] Mix pretreated sludge and activated sludge at a volume ratio of 1.5:1, with a total volume of 80m 3 , use a stirrer to stir and mix evenly, stirring speed: 25r / min. Stirring time is 15min. Add 2m at 2.5% by volume 3 Add the modified dextran solution and start stirring. The stirring speed is controlled at 20r / min. The modified dextran and the sludge particles undergo preliminary flocculation and produce tiny alum flakes. After stirring for 15 minutes, the small alum flakes gather to produce larger alum flake particles. And deposited down to produce mud-water stratification phenomenon, stop stirring.

[0042] The mud-water mixture after the modified dextran treatment is dehydrated by a press dehydration equipment, the press dehydration equipment is a common plate and frame filt...

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PUM

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Abstract

The invention relates to a method for treating viscose sludge by utilizing modified dextran. The method comprises the following steps of: (1) blending a modified dextran solution; (2) mixing pretreated sludge and activated sludge in the viscose fiber production process, adding a blended modified dextran solution, and stirring to obtain a sludge-water mixed solution; and (3) dehydrating the sludge-water mixed solution by using squeezing dehydration equipment. The modified dextran is adopted to treat sludge, and the process operation is more stable and safer. Due to the organic characteristics of the modified dextran, the modified dextran can be degraded in the process, and the solid content of the sludge cannot be increased. The modified dextran is not adhered to filter cloth in the filterpressing process, and the cost of the filter cloth can be saved. Large-particle substances are not added into the sludge, and equipment such as a pump body cannot be abraded. The produced high-zinc sludge can be sold outside, and the operation cost is reduced. The modified dextran is applied to treatment of viscose sludge, reduction and synergy of solid waste are achieved, and the method has promotion and guidance significance for sludge treatment in the viscose industry.

Description

technical field [0001] The invention relates to a method for treating viscose fiber sludge by using modified dextran, which belongs to the field of viscose fiber production, in particular to the field of sludge treatment in viscose fiber water treatment. Background technique [0002] At present, most viscose fiber factories adopt biochemical treatment system. The activated sludge produced by the biochemical system contains a large amount of colloidal particles and has a strong affinity with water. Without proper treatment, sludge dehydration will be very difficult. The current sludge treatment methods in the chemical fiber industry are roughly divided into two categories: one is to add cationic flocculants to the sludge and then add polyaluminum or polyferric salt, and use a belt filter machine or ordinary plate and frame filter press to treat the sludge, and the dehydrated filter cake contains water In 75%-80%, due to the addition of more heavy metal substances in this kind...

Claims

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Application Information

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IPC IPC(8): C02F11/122C02F11/147
CPCC02F11/122C02F11/147
Inventor 高悦郑军峰毕丽娟张银奎庞艳丽周洪发张海楠张银郑立东常保国杨宏宇张伟赵素静章建玲
Owner 唐山三友远达纤维有限公司
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