Surfactant for sludge dewatering and sludge dewatering method

A surfactant and sludge dehydration technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of low filtration performance and increased filtration resistance, and achieve increased hydrophobicity, reduced clogging, rigidity and toughness Good results

Inactive Publication Date: 2009-02-18
广州中滔绿由环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In the dehydration method with patent No. 200610047281.1, the injection pressure during dehydration adopts a constant pressure working method, because the filter cake is in a very de

Method used

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  • Surfactant for sludge dewatering and sludge dewatering method
  • Surfactant for sludge dewatering and sludge dewatering method
  • Surfactant for sludge dewatering and sludge dewatering method

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A surfactant for sludge dewatering, the surfactant is a quaternary ammonium salt cationic surfactant, the quaternary ammonium salt cationic surfactant is dodecyl dimethyl benzyl ammonium chloride, and its structural formula is

[0051] , the weight ratio of the added amount of the quaternary ammonium cationic surfactant is 1.97% of the solid content of the sludge.

[0052] The tensio-active agent in the following all examples all adopts the tensio-active agent in the embodiment 1, just addition is different;

[0053] A method for dewatering sludge using a surfactant, comprising the steps of:

[0054] 1) Sewage sludge pretreatment: Take sewage sludge with a water content of 80.4% by weight, add water to adjust the water content to 93% by weight, and take 1000 kg of sewage sludge with a water content of 93% after pretreatment.

[0055] 2) Adding a surfactant: adding 1.38 kg of dodecyldimethylbenzyl ammonium chloride and stirring for 10 minutes.

[0056] 3) Add flocc...

Embodiment 2

[0068] A surfactant for sludge dewatering, the difference from Example 1 is that the weight ratio of dodecyl dimethyl benzyl ammonium chloride added is 1.42% of the solid content of the sludge.

[0069] A method for sludge dehydration using surfactants, the difference from Example 1 is that step 2 "adding surfactants" is to add 1 kg of dodecyl dimethyl benzyl ammonium chloride, and stir for 5 minutes .

[0070] The moisture content of the sludge after dehydration was 54.9% by weight.

Embodiment 3

[0072] A surfactant for sludge dewatering, different from Example 1 is that the weight ratio of dodecyl dimethyl benzyl ammonium chloride added is 1.58% of the solid content of the sludge.

[0073] A method for sludge dehydration using surfactants, the difference from Example 1 is that step 2 "adding surfactants" is to add 1.11 kg of dodecyl dimethyl benzyl ammonium chloride, and stir for 6 minutes .

[0074] The moisture content of the sludge after dehydration was 54.4% by weight.

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PUM

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Abstract

The invention relates to surface active agent used for filthy mud dehydration. The addition of dodecyl benzyl dimethyl ammonium chloride is 1.42 to 2.07 percent by weight of the solid content of the filthy mud. The surface active agent has the advantages of low specific impedance value of the filthy mud after the surface active agent is added and high solid content ratio of filter mass after dehydration. In a method for filthy mud dehydration with the surface active agent, pressure filtration dehydration is carried out with a plate and frame filter press, the filthy mud injection pressure is progressively increased, the sewage and filthy mud to be regulated is injected into a filter press at certain injection pressure, and when the filter press is full, filtrate discharging flux is V1; when the filtrate discharging flux is lower than one half of V1, the filthy mud injection pressure is increased to a higher level, and the filtrate discharging flux is increased to V2; when the filtrate discharging flux is lower than one half of V2, the filthy mud injection pressure is increased to a higher level again, so that the filthy mud injection pressure is progressively increased to the preset pressure in this way, then feeding is stopped and the pressure is maintained, and finally the membrane extrusion is carried out. The method has the advantages of uniform increase of the density of mud cakes and small filtration resistance in filtration.

Description

technical field [0001] The invention relates to a surfactant and a sludge dehydration method for sludge dewatering, in particular to a quaternary ammonium salt surfactant and a sludge dehydration method for sewage sludge dehydration. Background technique [0002] The key to sludge treatment is sludge dehydration, which generally contains about 80% water. The water in sludge can be divided into four types according to its existing state: 1) interstitial water, which is free water surrounded by sludge particles, generally accounting for about 70% of the total water content of sludge; 2) capillary water, capillary water It is the water between the sludge particles or in the particle cracks that is combined with the sludge particles due to capillary action, accounting for about 20% of the total water; 3) Adsorbed water, which is adsorbed on the surface of the sludge particles due to the effect of surface tension Moisture, due to the small size of sludge particles, has a strong ...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 古耀坤任延杰
Owner 广州中滔绿由环保科技有限公司
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