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Excess sludge treatment method

A technology for excess sludge and treatment methods, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of unsatisfactory sludge lysis and large dosage, and achieve heavy metal removal Thorough, good fluidity, the effect of reducing COD

Active Publication Date: 2015-07-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the simple addition of surfactants is not ideal for the lysis of sludge, and the amount used alone is relatively large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The excess sludge used in the examples was obtained from the excess sludge in a biochemical tank of a sewage treatment plant in Fushun, with a moisture content of 97.5 wt%. The supernatant COD after sludge centrifugation was 2870mg / L. The content is the component analysis of the analyzed samples after they were dried to constant weight at 105°C, and the specific results are shown in Table 1.

[0025] Table 1 Sample composition analysis

[0026] Element Cu Ni Zn Cr Cd Pb Content, mg / Kg 360 256.5 981.3 822.5 255.4 753.7

[0027] The cationic surfactant used in this example is cetyltrimethylammonium bromide.

[0028] Add 10kg of the above-mentioned remaining sludge into the reaction barrel, stir at 28°C at a stirring rate of 5000rpm, add 15g of surfactant and 10g of sodium percarbonate into the reaction barrel at the same time, and react for 4 hours; then add nano-zero valence into the reaction barrel Iron 25g, reacted at 28°C for 6h, ...

Embodiment 2

[0032] Adopt identical raw material with embodiment 1, but do not add sodium percarbonate in the first step process, all the other processing conditions are the same with embodiment 1.

[0033] The surfactant used in this example is cetyltrimethylammonium bromide.

[0034] Add 10kg of the above-mentioned remaining sludge into the reaction tank, stir at 28°C at a stirring rate of 5000rpm, and add 15g of surfactant to the reaction tank at the same time, and react for 4h; then add 25g of nanometer zero-valent iron to the reaction tank, After reacting for 6 hours at ℃, the obtained sludge was sent to a permanent magnet magnetic separator to remove nano-scale zero-valent iron containing heavy metals in the sludge. The sludge is dewatered by centrifugation to obtain purified sludge and water. After centrifugation, the moisture content of the mud cake is 68.8%, and the COD content in the water is 1680mg / L. Among them, the sewage is returned to the sewage treatment plant for further ...

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PUM

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Abstract

The invention discloses an excess sludge treatment method which comprises the following steps: adding excess sludge to a reaction tank, with high speed stirring at 15-50 DEG C, adding a surfactant and sodium percarbonate to the reaction tank, after 0.5-5h of reaction, adding nano zero-valent iron, at 15-50 DEG C reacting for 1-8h, sending the sludge into a magnetic separator to remove the nano zero-valent iron containing heavy metals in the sludge; performing mechanical dewatering of the treated sludge to respectively obtain purified sludge and water. The excess sludge treated by the method is low in water content and high in heavy metal removal rate, the treated water is low in (chemical oxygen demand) COD value, and the excess sludge treatment method is low in cost, green, and free of secondary pollution, and can lay a foundation for agricultural or forestry sludge or other resource method.

Description

technical field [0001] The invention relates to a method for treating sludge, in particular to a method for treating sludge using a combined process of surfactant-nano zero-valent iron-magnetic separation-mechanical dehydration. Background technique [0002] As the standards for urban sewage treatment become more and more stringent, the output of sludge in the process of urban sewage treatment has also increased significantly. With the continuous increase in the amount of sludge, the problem of sludge disposal comes with it. There are landfill, incineration, dumping into the sea and agricultural utilization. No matter which disposal method is adopted, reducing the moisture content of sludge is the basis. How to effectively reduce the moisture content of sludge to facilitate subsequent treatment, and to develop cost-effective new technologies to improve sludge dewatering performance will be the focus of sludge treatment research. For the resource utilization of sludge, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
Inventor 吴巍回军赵景霞
Owner CHINA PETROLEUM & CHEM CORP
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