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Method for preparing modified activated coke from sewage sludge

A technology of sewage sludge and activated coke, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as secondary pollution of heavy metals without considering mechanical properties, achieve resource recycling, reduce heavy metal content, Inexpensive effect

Active Publication Date: 2019-07-12
HUATIAN NANJING ENG & TECH CORP MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing studies directly prepare activated carbon from sludge, without considering its mechanical properties and possible secondary pollution of heavy metals.

Method used

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  • Method for preparing modified activated coke from sewage sludge
  • Method for preparing modified activated coke from sewage sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, a method for preparing modified activated coke from sewage sludge comprises the following steps:

[0026] (1) Add waste polyvinyl chloride in the sludge carbonization process;

[0027] (2) Treat the flue gas containing HCl and heavy metal pollutants generated during the carbonization process.

[0028] Also include the following steps before the step (1):

[0029] (1) performing indirect drying treatment on the dewatered sludge to obtain dried sludge;

[0030] (2) crushing and grinding the dried sludge in step (1);

[0031] (3) The dried sludge crushed in step (2) is prepared by mixing 3-15% of dried sludge, 84-96% of coal powder, and 1% of adhesive;

[0032] (4) Carrying out carbonization treatment for 0.5-2 hours on the sludge mixed and formed in step (3) and coal powder.

[0033] After the sludge and pulverized coal carbonization treatment of the mixed molding, the following steps are also included:

[0034] (1) Add an activator to the mixed s...

Embodiment 2

[0058] Such as figure 1 As shown, based on Example 1, the active agent in the activation treatment described in this example is zinc chloride active agent, the activation temperature of the activation treatment is 900-1100° C., and the activation time is 1-3 hours.

[0059] In the modified treatment, the modifying agent is V 2 o 5 colloidal solution, the V 2 o 5 The concentration of the colloidal solution is 0.1-0.5mol / L, and the temperature is 105-120°C; the active coke is immersed in V 2 o 5 The time of the colloidal solution is 1-5 hours, and after taking it out, dry it at 105°C to obtain the modified active coke;

[0060] The specific steps are as follows: the sludge drying temperature is 200°C, the moisture content of the dewatered sludge is reduced to 20% after drying, and it is ground to 200 mesh by a crusher, and the dried sludge, coal powder and binder are mixed according to The mass fractions of 5%, 94% and 1% were prepared into moldings, the carbonization temp...

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Abstract

The invention discloses a method for preparing modified active coke from sewage sludge. The method comprises the following steps: 1, adding waste polyvinyl chloride in the charring process of the sludge; and 2, processing flue gas containing HCl and heavy metal pollutants, generated in the charring process. The waste polyvinyl chloride added in the charring process converts the heavy metal compounds in the sludge into volatile heavy metal chlorides, and the volatile heavy metal chlorides migrate into the flue gas at a high temperature, and are captured by a flue gas processing system, so heavy metals in the sludge are reduced, and reducing, recycling and environmental protection treatment of the sludge is realized.

Description

technical field [0001] The invention relates to a method for preparing modified active coke from sewage sludge. Background technique [0002] Sewage sludge is a by-product produced in the process of municipal sewage treatment, and every ton of wastewater treated will produce 3 to 5 kilograms of sludge. According to statistics, in 2015, the amount of sewage sludge produced in my country has exceeded 47 million tons, but the amount of sludge that has been harmlessly treated and reduced by landfill, incineration, etc. is only 30% of the total amount of sludge. Sludge contains nutrients nitrogen and phosphorus, which can be used as fertilizer for agriculture. However, during the flocculation process of sewage treatment, 70-90% of heavy metals (Cd, Pb, Cu, As, Cr, Ni) will be transferred to In the sludge, the way of its resource utilization is limited. From the perspective of sludge disposal methods, landfill sites are increasingly scarce, and there are potential risks of soil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/354C01B32/324C01B32/348
CPCC01P2006/12
Inventor 王思佳夏溢徐庆余胡海燕徐伟
Owner HUATIAN NANJING ENG & TECH CORP MCC