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Flocculating agent for sludge dewatering and sludge dewatering method

A sludge dewatering and flocculant technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of increasing filtration resistance and reducing filtration performance, and achieve the effects of reducing clogging, increasing hydrophobicity, and improving filtration effect

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

Therefore, the working mode of constant pressure increases the filtration resistance, and the filtration resistance offsets the filtration pressure, so that the filtration performance is also rapidly reduced, and the final dehydration effect is generally above 70%.

Method used

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  • Flocculating agent for sludge dewatering and sludge dewatering method
  • Flocculating agent for sludge dewatering and sludge dewatering method
  • Flocculating agent for sludge dewatering and sludge dewatering method

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A flocculant for sludge dewatering, composed of polyaluminum chloride and polyacrylamide, the weight ratio of the flocculant added is 8.11% of the solid content of the sludge, and the weight ratio of polyacrylamide is 5.06% of the flocculant .

[0055] A method for dewatering sludge using a surfactant, comprising the steps of:

[0056] 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.

[0057] 2) Adding a surfactant: adding 1.38 kg of dodecyldimethylbenzyl ammonium chloride and stirring for 10 minutes.

[0058] 3) Add flocculant: first add 6.59 kg of polyaluminum chloride, stir at 32.0 rpm for 2 minutes, and stir at 10.0 rpm for 3 minutes; add lime powder to adjust the pH value of the sewage sludge to 7; add 0.35 kg of polyacrylamide, 32.0 rev / min fast stirring for 3 minutes, 10.0 rev / min slo...

Embodiment 2

[0070] A flocculant for sludge dewatering, composed of polyaluminum chloride and polyacrylamide, the weight ratio of the flocculant added is 4.92% of the solid content of the sludge, and the weight ratio of polyacrylamide is 5.33% of the flocculant .

[0071]A method for dewatering sludge using surfactants, the difference from Example 1 is: step 3 "adding flocculant" is to add 3.26 kg of polyaluminum chloride first, stir at 32.0 rpm for 2 minutes, and stir at 10.0 rpm Stir slowly for 3 minutes; add lime powder to adjust the pH value of the sewage sludge to 6; add 0.18 kg of polyacrylamide, stir quickly at 32.0 rpm for 3 minutes, and stir slowly at 10.0 rpm for 7 minutes.

[0072] The moisture content of the sludge after dehydration was 54.9% by weight.

Embodiment 3

[0074] A flocculant for sludge dewatering, composed of polyaluminum chloride and polyacrylamide, the weight ratio of the flocculant added is 6.04% of the sludge solid content, and the weight ratio of polyacrylamide is 4.38% of the flocculant .

[0075] A method for sludge dehydration using a surfactant, the difference from Example 1 is: step 3 "add flocculant" is to add 4.03 kg of polyaluminum chloride first, stir at 32.0 rpm for 2 minutes, and stir at 10.0 rpm Stir slowly for 3 minutes; add lime powder to adjust the pH value of the sewage sludge to 6.5; add 0.19 kg of polyacrylamide, stir quickly at 32.0 rpm for 3 minutes, and stir slowly at 10.0 rpm for 7 minutes.

[0076] The moisture content of the sludge after dehydration was 53.7% by weight.

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Abstract

is the invention discloses a flocculating agent for filthy mud dehydration, which is composed of polyaluminium chloride and polyacrylamide. The flocculating agent addition is 4.92 percent to 10.18 percent by weight of the solid content of the filthy mud; and the polyaluminium is 4.38 percent to 5.33 percent by weight of the flocculating agent. The flocculating agent has the advantages of low specific impedance value of the filthy mud and high solid content of filter mass after dehydration. The method of filthy mud dehydration and the method of flocculating agent adding are as follows: polyaluminium chloride is added first, then is fast stirred at the speed of 32.0 r / m for two minutes and slowly stirred at the speed of 10.0 r / m for three minutes, and the pH value of sewage mud is regulated to 6 to 8; and the polyacrylamide is added, is fast stirred at the speed of 32.0 r / m for three minutes and then is slowly stirred at the speed of 10.0 r / m for seven minutes. The methods have the advantages that the flocculating agent can fully contact solid grains to facilitate the flocculating agent to trap colloid grains, so that the concentration distribution of the flocculating agent is uniform; large grains can not be stirred into small grains, precipitated grains can not be stirred into non-precipitated grains, so that the flocculation effect is improved.

Description

technical field [0001] The invention relates to a flocculant for sludge dewatering and a sludge dewatering method, in particular to a flocculant for sludge dewatering and a sludge dewatering method composed of polyaluminum chloride and polyacrylamide. 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 partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 古耀坤陈国安
Owner 广州中滔绿由环保科技有限公司
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