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Method for dewatering sludge by means of flocculation conditioner coupling ultrasonic oxidation

A technology for sludge dewatering and conditioning agent, which is applied in the fields of oxidation treatment of sludge, chemical instruments and methods, water/sludge/sewage treatment, etc. problem, to reduce the compressibility, improve the dehydration effect, and increase the calorific value

Active Publication Date: 2016-06-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at problems such as high compressibility, poor permeability, few drainage channels, poor dehydration effect, residue in incineration, corroded boiler and other problems of the sludge filter cake obtained by the existing sludge dehydration conditioning technology, adopts cationic polyacrylamide and has hollow The hemp fiber powder with a certain structure and certain mechanical strength is used as a sludge dehydration conditioning agent to reduce the compressibility of the sludge filter cake, improve the permeability of the sludge filter cake, increase the drainage channels in the sludge filter cake, and improve the sludge filtration. The dehydration effect of the cake increases the calorific value of the sludge filter cake, so that the sludge filter cake obtained after dehydration can be directly incinerated without producing slag that affects the operation of the incineration boiler, does not emit toxic and harmful gases, and does not pollute the environment.

Method used

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  • Method for dewatering sludge by means of flocculation conditioner coupling ultrasonic oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the sludge dewatering method of flocculation conditioner coupled with ultrasonic oxidation uses cationic polyacrylamide and hemp fiber powder as conditioning agents, and the specific conditioning method includes the following steps:

[0023] Step 1, crushing the hemp fiber in a crusher to a hemp fiber powder whose particle size is below 3mm;

[0024] If the particle size of the hemp fiber is too large, it is easy to precipitate and cannot be uniformly dispersed in the sludge, so that the hemp fiber cannot be evenly dispersed in the sludge filter cake, and the dehydration effect of the sludge filter cake is not good. Simultaneously, the hemp fiber particle size is too large to increase its consumption, and the researchers unexpectedly found that when the hemp fiber powder is a mixture of 0-3mm, the effect is better than that of a single particle size. Therefore, the present invention uses hemp fibers of different particle sizes.

[0025] Step 2. Soak ...

Embodiment 2

[0048] In this embodiment, the sludge dehydration method coupled with flocculation conditioner coupled with ultrasonic oxidation uses cationic guar gum and hemp fiber powder as conditioning agents, and the specific conditioning method includes the following steps:

[0049] Step 1, crushing the hemp fiber in a crusher to a hemp fiber powder whose particle size is below 3mm;

[0050] If the particle size of the hemp fiber is too large, it is easy to precipitate and cannot be uniformly dispersed in the sludge, so that the hemp fiber cannot be evenly dispersed in the sludge filter cake, and the dehydration effect of the sludge filter cake is not good. Simultaneously, the hemp fiber particle size is too large to increase its consumption, and the researchers unexpectedly found that when the hemp fiber powder is a mixture of 0-3mm, the effect is better than that of a single particle size. Therefore, the present invention uses hemp fibers of different particle sizes.

[0051] Step 2. ...

Embodiment 3

[0074] In this embodiment, the sludge dewatering method of flocculation conditioner coupled with ultrasonic oxidation is to use cationic polyacrylamide and hemp fiber powder as conditioning agents, and use a pressure filter as dewatering equipment. The specific conditioning method includes the following steps:

[0075] Step 1, crushing the hemp fiber in a crusher to a hemp fiber powder whose particle size is below 3mm;

[0076] If the particle size of the hemp fiber is too large, it is easy to precipitate and cannot be uniformly dispersed in the sludge, so that the hemp fiber cannot be evenly dispersed in the sludge filter cake, and the dehydration effect of the sludge filter cake is not good. Simultaneously, the hemp fiber particle size is too large to increase its consumption, and the researchers unexpectedly found that when the hemp fiber powder is a mixture of 0-3mm, the effect is better than that of a single particle size. Therefore, the present invention uses hemp fibers ...

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Abstract

The invention discloses a method for dewatering sludge by means of flocculation conditioner coupling ultrasonic oxidation. The method specifically comprises the steps that 1, fibrilia is crashed into fibrilia powder with the particle size below 3mm; 2, the fibrilia powder is soaked in a dilute sulphuric acid solution with the concentration of 1.5-2.0 g / L; 3, the fibrilia powder is soaked in a sodium hydroxide solution with the concentration of 15-80 g / L; 4, the fibrilia powder is soaked in diesel oil at room temperature for 0.5-2 hours before being taken out, and the mass ratio of the fibrilia powder to the diesel oil is 1:10-1:15; 5, water is added to cationic polyacrylamide to be prepared into a solution with the mass percent of 0.05%-0.5%; 6, the sludge is treated through ultrasonic waves at the frequency of 28 kHz-120 kHz; 7, O3 is introduced into the sludge; 8, the fibrilia powder prepared in the step 4 is added into the sludge to be treated; 9, cationic polyacrylamide continues to be added; 10, the mixed sludge is fed into a plate-and-frame filter press for dewatering. According to the method, the fibrilia is used for increasing the number of drainage ducts in a sludge filter cake, and therefore the dewatering effect of the sludge filter cake is improved.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a sludge dehydration method in which a flocculation conditioner is coupled with ultrasonic oxidation. Background technique [0002] There are many methods for sludge treatment in the prior art. The invention titled "Sludge Dewatering Method" with the application number 201310169618.6 discloses a sludge dehydration method in which anionic polyacrylamide is added to the concentrated sludge In this method, the sludge is dehydrated after flocculation conditioning, but this method cannot be used for a kind of sludge deep dehydration conditioning, because this method cannot reduce the compressibility of the sludge and improve the permeability of the sludge, and cannot effectively reduce the sludge Moisture of mud filter cake; the invention title of application number 201310258975.X is "a method for improving sludge dewatering performance", which discloses a method for improving sludge dewat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14C02F11/06
CPCC02F11/06C02F11/12C02F11/121C02F11/14C02F2303/06
Inventor 李辉杨洁刘勇弟王晓丽陈帅
Owner EAST CHINA UNIV OF SCI & TECH