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Method for preparing active carbon from urban sewage treatment plant mud

A technology for preparing activated carbon and urban sewage, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of secondary pollution, large capacity, odor, etc. The effect of reducing production costs and reducing urban land use

Inactive Publication Date: 2005-07-27
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sewage plant sludge is a semi-dry solid waste with a high water content, a large amount of organic matter, and toxic and harmful substances (including microorganisms, heavy metals, and toxic organic matter) with complex flow deformation. Smell, if not treated and disposed of safely, will cause serious secondary pollution problems, but at the same time the sludge contains a large amount of organic matter, humus and other available resources

Method used

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  • Method for preparing active carbon from urban sewage treatment plant mud
  • Method for preparing active carbon from urban sewage treatment plant mud
  • Method for preparing active carbon from urban sewage treatment plant mud

Examples

Experimental program
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Embodiment 1

[0025] Dry the sludge with 2% additives to a moisture content of about 10%; add 20% sawdust as a charring agent, and then impregnate it with a 40% concentration of zinc chloride solution for 24 hours, and at this time the sludge and zinc chloride The solution mass ratio is 1:2, and then dried at 105°C for 30 minutes, and finally heated to 600°C in a high-temperature furnace for carbonization activation, and the maintenance time is 20 minutes. Activated carbon is obtained by cooling, washing and drying. The prepared activated carbon iodine adsorption value is 805mg / g.

[0026] The surface of the prepared activated carbon presents an irregular porous structure (see figure 2 ). Its physical characteristics are: the specific surface area of ​​activated carbon is 685.8m 2 / g, the average pore diameter is 2.82nm, and the average pore volume is 0.45ml / g. It has the performance of adsorbing macromolecular organic matter.

[0027] Weigh several parts of activated carbon of about ...

Embodiment 2

[0029] Dry the sludge with 0.8% additives until the water content is about 10%; add 10% sawdust as a charring agent, use 30% concentration of zinc chloride solution, and the weight ratio of sludge to zinc chloride solution is 1: 1.5. After soaking for 42 hours, dry it in an oven (105°C) for 30 minutes, then put it in a high-temperature furnace and heat it up to the activation temperature of 700°C for carbonization and activation, and the maintenance time is 30 minutes. Activated carbon is obtained by cooling, washing and drying. The prepared activated carbon iodine adsorption value is 624mg / g. The surface of the prepared sludge activated carbon presents an irregular porous structure (see image 3 ). Its physical characteristics are: the specific surface area of ​​activated carbon is 548m 2 / g, the average pore diameter is 2.8nm, and the average pore volume is 0.39ml / g.

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Abstract

Production of active carbon by mud in urban sewage treatment plant is carried out by: 1. drying mud in sewage treatment plant added 0.5-3% additive, decreasing mud water ratio 10%; 2. taking zinc chloride with concentration 20-60% as activator solution, immersing for 12-48hrs with weight ratio of mud and activator 1:1-3, and drying 20-50mins under 105deg.C; 3. adding 5-30% saw dust, shell and kernel as carburant; 4. mixing, heating to 500-800deg.C in furnace, and carbonizing activating with carbonizing time 15-50mins; 5. cooling, washing, and drying to obtain active carbon. It achieves lower urban mud discharge, to decrease production cost and to prevent secondary pollution.

Description

technical field [0001] The invention relates to the treatment and utilization of urban sewage plant sludge. Background technique [0002] Municipal sewage plant sludge is a by-product of sewage treatment systems. With the acceleration of urbanization, the water industry will become an industry with great potential in my country, and the amount of domestic water supply and urban sewage will increase, followed by more and more sludge produced by sewage treatment plants , According to statistics, the amount of dry sludge produced in the world every year reaches 100 million tons. In 2000, the sludge produced in my country was about 20 million tons (96% moisture content). Sewage plant sludge is a semi-dry solid waste with a high water content, a large amount of organic matter, and toxic and harmful substances (including microorganisms, heavy metals, and toxic organic matter) with complex flow deformation. If the stench is not treated and disposed of safely, it will cause serious...

Claims

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Application Information

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IPC IPC(8): C01B31/08C02F11/00
Inventor 王启山任爱玲吴立波徐美娟
Owner NANKAI UNIV
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