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Potassium permanganate lysis/ferric chloride flocculation/biological carbon skeleton combined conditioning method for municipal sludge

A technology of potassium permanganate and urban sludge, applied in the field of environmental governance, can solve problems such as hindering water circulation, hindering sludge dehydration performance, and limited effect of a single sludge conditioning method, so as to improve dehydration performance and solve sludge Pollution problem, low cost effect

Inactive Publication Date: 2016-01-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of a single sludge conditioning method is limited. Therefore, the use of combined conditioning methods to improve sludge dewatering performance has become a research hotspot in sludge conditioning.
[0004] Luo Haijian and others studied the combined conditioning of organic flocculant cationic polyacrylamide and skeleton particle wood chips, and Wang Dongsheng and others studied the combined conditioning of urban sludge with enzyme cracking and inorganic flocculants. The research shows that the two methods combined conditioning sludge The sludge dewatering performance is better than that of a single method of conditioning. The former has not pre-cracked the sludge, and the existence of a large number of extracellular polymers still hinders the further improvement of the sludge dewatering performance. During the process, the filter cake becomes more and more compact, which greatly hinders the circulation of water. Therefore, there are certain limitations in the joint conditioning of sludge by these two methods.
At present, there is no method to jointly condition urban sludge by using sludge cell breaking-floc reconstruction-skeleton establishment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Under the stirring condition of 300r / min, add potassium permanganate of 18g / kg sludge dry weight to the original sludge, stir for 1min, and crack the sludge cells;

[0020] (2) under the stirring condition of 300r / min, continue to add the ferric chloride of 138g / kg sludge dry weight in the broken cell sludge described in step (1), stir 1min, promote the growth of sludge floc;

[0021] (3) Under the stirring condition of 30r / min, continue to add the biochar of 55% sludge dry weight in the flocculation sludge described in step (2), stir 4min, biochar promotes in the sludge filter cake as skeleton water channel;

[0022] (4) Filtering and dehydrating the conditioned sludge in step (3).

[0023] The obtained results are as follows: the raw sludge is filtered, and the specific resistance of the sludge is 7.70×10 13 m / kg, the net yield of sludge is 1.12kg / (m 2 h); the specific resistance of the sludge after conditioning with potassium permanganate alone is 2.33×10 13 ...

Embodiment 2

[0025] (1) Under the stirring condition of 350r / min, add potassium permanganate of 20g / kg sludge dry weight to the original sludge, stir for 2min, and crack the sludge cells;

[0026] (2) under the stirring condition of 350r / min, continue to add the ferric chloride of 140g / kg sludge dry weight in the broken cell sludge described in step (1), stir 2min, promote the growth of sludge floc;

[0027] (3) Under the stirring condition of 40r / min, continue to add the biochar of 60% sludge dry weight in the flocculation sludge described in step (2), stir 5min, biochar promotes in the sludge filter cake as skeleton water channel;

[0028] (4) Filtering and dehydrating the conditioned sludge in step (3).

[0029] The obtained results are as follows: the raw sludge is filtered, and the specific resistance of the sludge is 5.37×10 13 m / kg, the net yield of sludge is 1.51kg / (m 2 h); the specific resistance of the sludge after conditioning with potassium permanganate alone is 1.04×10 13 ...

Embodiment 3

[0031] (1) Under the stirring condition of 400r / min, add potassium permanganate of 22g / kg sludge dry weight to the original sludge, stir for 3min, and crack the sludge cells;

[0032] (2) under the stirring condition of 400r / min, continue to add the ferric chloride of 146g / kg sludge dry weight in the broken cell sludge described in step (1), stir 3min, promote the growth of sludge floc;

[0033] (3) Under the stirring condition of 40r / min, continue to add the biochar of 70% sludge dry weight in the flocculation sludge described in step (2), stir 6min, biochar promotes the biochar in the sludge filter cake as skeleton water channel;

[0034](4) Filtering and dehydrating the conditioned sludge in step (3).

[0035] The obtained results are as follows: the raw sludge is filtered, and the specific resistance of the sludge is 8.89×10 13 m / kg, the net yield of sludge is 1.06kg / (m 2 h); the sludge specific resistance after conditioning with potassium permanganate alone is 3.79×10 ...

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Abstract

The invention discloses a potassium permanganate lysis / ferric chloride flocculation / biological carbon skeleton combined conditioning method for municipal sludge, belonging to the technical field of environmental management. The method comprises the step of feeding certain amounts of potassium permanganate, ferric chloride and biological carbon into excess sludge at a certain stirring speed according to a certain feeding sequence, so as to condition the municipal sludge, so that the dehydration property of the municipal sludge is improved. The method has the beneficial effects that the cost of conditioning agents is low, and the operation is simple; meanwhile, the sludge breakage, flocculating constituent reconstruction and filter cake skeleton structure construction are achieved by virtue of three conditioning agents, so that the dehydration property of the sludge is overall improved, and the limitations of a single method and the combination of two methods in the past are broken through; by virtue of combined conditioning of the three conditioning agents, the dehydration property of the sludge can be obviously improved, and the moisture content of dehydrated sludge reaches 62%-67%; the cost is low, and the process is simple. The method is significant for the solving of the pollution problem of sludge.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for jointly conditioning urban sludge by potassium permanganate cell destruction / ferric chloride flocculation / biological carbon skeleton. Background technique [0002] With the development of the economy and the improvement of people's living standards, most cities in my country have built centralized sewage treatment plants, and a large amount of excess sludge is produced in the process of sewage treatment, and it shows a trend of rapid growth year by year. Due to technical, economic, environmental, social and legal reasons for sludge treatment in my country, about 80% of the sludge in sewage treatment plants cannot be properly treated and disposed of, resulting in serious secondary pollution. Residual sludge contains more than 97% moisture, so effective dewatering of sludge is the key to sludge treatment. As a highly plastic fluid, excess s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14
Inventor 张盼月吴彦曾光明张光明叶捷张海波房玮刘建波夏亚平晏铭苟玺莹
Owner HUNAN UNIV
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