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Dewatering method for sludge microbiologically treating life waste water

A technology for excess sludge and domestic sewage, applied in flocculation/sedimentation water/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve unfavorable transportation and disposal, low market ownership, high cost of amphoteric polymers, etc. problems, achieve the effects of reducing volume and weight, improving resource utilization, and good environmental benefits

Inactive Publication Date: 2006-06-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the volume of sludge is very large and its properties are very unstable, it is not conducive to transportation and disposal; and the sludge that has not been properly treated and disposed of enters the environment, which will bring secondary pollution to the environment, and constitute a serious threat to the ecological environment and human activities. serious threat
The existing problems in sludge treatment are: (1) high moisture content of sludge and high transportation cost; (2) low resource utilization rate
However, the cost of amphoteric polymers is high, the market has a small amount, and it is not easy to purchase
Therefore, this method is suitable for sludge that is difficult to dewater, not for residual sludge from municipal sewage treatment plants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Evenly add fly ash to the remaining sludge in an amount of 0.2g / L and stir for 30 seconds; then add aluminum chloride in an amount of 4% (mass fraction) of dry sludge and stir for 30 seconds; Add polyacrylamide (PAM) in the amount of g / L, stir for 30 seconds; settle naturally (about 15 seconds); vacuum filter or press filter for 3 minutes. After the above treatment, the water content decreased by 3.10 percentage points compared with the single use of PAM.

example 2

[0018] Evenly add fly ash in the remaining sludge in an amount of 0.4g / L and stir for 1 minute; then add aluminum chloride in an amount of 5% (mass fraction) of the dry sludge amount and stir for 1 minute; Add polyacrylamide (PAM) in the amount of L, stir for 1 minute; settle naturally (about 30 seconds); vacuum filter or press filter for 4 minutes. After the above treatment, the water content decreased by 3.89 percentage points compared with the single use of PAM.

example 3

[0020] Evenly add fly ash in the remaining sludge in an amount of 0.6g / L and stir for 90 seconds; then add aluminum chloride in an amount of 6% (mass fraction) of dry sludge and stir for 90 seconds; Add polyacrylamide (PAM) in the amount of L, stir for 80 seconds; settle naturally (about 60 seconds); vacuum filter or press filter for 5 minutes. After the above treatment, the water content decreased by 5.60 percentage points compared with the single use of PAM.

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PUM

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Abstract

The present invention belongs to the field of environment protection technology, and is especially process of dewatering sludge from city sewage treating microbiological process. The sludge dewatering process includes the following steps: 1. adding flyash into sludge in the amount of 0.2-0.6 g each liter of sludge, and stirring for 20-120 sec; 2. adding aluminum chloride in the amount of 4-6 wt% of dry sludge, and stirring for 20-120 sec; 3. adding polyacrylamine in the amount of 0.03-0.05 g each liter of sludge, and stirring for 20-90 sec; 4. depositing naturally for 10-600 sec; and 5. vacuum suction filtering or pressure filtering for 2-6 min. The said process can lower the water content of sludge from 99.4-99.8 % to 76.5-79.0 %, and compared with single polyacrylamine process, the present invention has higher sludge dewatering rate and low polyacrylamine consumption.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a dehydration method suitable for treating excess sludge produced by treating municipal sewage with a microbial method. Background technique [0002] In the total infrastructure cost of the sewage treatment plant, about 20%-50% is used for sludge treatment, so sludge treatment is an important part of the sewage treatment system. In recent years, the sludge production of urban sewage treatment plants has increased dramatically. Because the volume of sludge is very large and its properties are very unstable, it is not conducive to transportation and disposal; and the sludge that has not been properly treated and disposed of enters the environment, which will bring secondary pollution to the environment, and constitute a serious threat to the ecological environment and human activities. serious threat. The existing problems in sludge treatment are: (1) high wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F11/12C02F11/14
Inventor 林海张辉
Owner UNIV OF SCI & TECH BEIJING
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