Dewatering process for domestic sludge

A technology for domestic sludge and sludge, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of sludge restriction and so on

Inactive Publication Date: 2009-01-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that sludge dehydration and demulsification are mutually restricted by the system formed by sludge mass and sewage in the existing dehydration method, and to provide a dehydration method for domestic sludge

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0009] Specific embodiment one: the dehydration method of domestic sludge in the present embodiment is as follows: the cationic surfactant that mass concentration is 5% and mass concentration is that 1%~4% cationic nucleating agent joins sludge and leaves standstill 1~ 2 minutes, then add a starch-type bridging agent with a mass concentration of 0.4% to 0.6% or a hydrotalcite-type bridging agent with a mass concentration of 0.4% to 0.6% under stirring conditions, then age for 8 to 15 minutes and then filter , that is to complete the dehydration of domestic sludge; wherein the volume ratio of cationic surfactant to sludge is 0.4-0.8:1000, the volume ratio of cationic nucleating agent to sludge is 5-7:1000, and starch-type bridging agent or The volume ratio of hydrotalcite bridging agent to sludge is 1-1.5:1000.

[0010] The preparation method of the cationic nucleating agent in the present embodiment is as follows: 1. Under the condition of nitrogen, deoxygenate the quaternary ...

specific Embodiment approach 2

[0013] Embodiment 2: This embodiment differs from Embodiment 1 in that the cationic surfactant is one or both of metal hydroxide electropositive colloids, fatty amine salts and quaternary ammonium salts. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the metal hydroxide positive colloid is basic polyaluminum chloride or aluminum magnesium hydroxide positive electrosol. Others are the same as in the first embodiment.

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Abstract

A dehydration method of domestic sludge relates to a dehydration method of sludge. The dehydration method solves the problem in the prior dehydration method that a system formed by a sludge flock and sewage causes the dehydration of the sludge and demulsification to be mutually restrained. The dehydration method comprises the following steps: standing for 1 to 2 minutes after a cationic surfactant with 5 percent of quality concentration and a cationic nucleating agent with 1 to 4 percent quality concentration are added to the sludge; then adding a starch type bridging agent with 0.4 to 0.6 percent of quality concentration or a hydrotalcite type bridging agent with 0.4 to 0.6 percent of quality concentration under the agitating condition; and finally filtering after ageing for 8 to 15 minutes, namely the dehydration of the domestic sludge is finished. The method had the advantages that the demulsification is realized; the formed flock after being aged is more compact than the flock formed by applying flopamem 235 under the same condition; and the dehydration capacity is strong.

Description

technical field [0001] The invention relates to a method for dewatering sludge. Background technique [0002] In addition to solid particles such as a large amount of sediment and organic residues, domestic sewage sludge also contains residual organic soluble substances such as fruit juices and vegetable juices, liquid insoluble substances such as vegetable oils and animal fats, and their saponified or partially saponified substances. Alkaline soap, neutral detergent, non-ionic detergent and other surface active substances. After various physical or chemical changes such as mechanical degradation, physical capture, chemical adsorption, and activated sludge conversion, the above substances form stable colloidal particles, which are not easy to precipitate and separate out. Colloidal particles pass through again -COO - , -OH - Such groups adsorb a large amount of sediment or solid insoluble impurities to form a large negative ion group. At the same time, surface active sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 綦峥祁佩时
Owner HARBIN INST OF TECH
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