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Prepn of wet sludge carbonizing adsorbent

A wet sludge and adsorbent technology, applied in the field of environmental engineering, can solve the problems of high cost of sludge drying treatment, difficult to popularize and apply, achieve significant environmental and social benefits, avoid secondary pollution, and reduce emissions. Effect

Inactive Publication Date: 2007-06-06
上海银龙水务设备公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research on the preparation of carbonized materials from sludge currently adopts the method of first drying the sludge, and then using the dried sludge as raw material for activation and carbonization. The disadvantage of this method is that the sludge drying treatment The cost is high, which makes it difficult to popularize and apply the technology in actual production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take the excess sludge from a sewage plant in Shanghai, after dehydration treatment, make the solid content 10% (water content 90%), add zinc chloride solution with a concentration of 40% at a volume ratio of 1:0.5, and activate 4 hours, and then the mixture was dried at 105°C to a moisture content of 10%. Accurately weigh a certain amount of sample, put it into a high-temperature carbonization furnace, and under the condition of water vapor as a protective gas, pyrolyze and carbonize at a temperature of 700°C for 30 minutes at a heating rate of 40°C per minute, and cool to room temperature. The product is washed repeatedly with 3% hydrochloric acid solution to remove zinc chloride and other inorganic substances, adjusted to neutrality with distilled water, and then dried at 105°C to constant weight for later use. The iodine value of the prepared carbonized material is 650mg·g -1 ;The specific surface area is 547.7m 2 g -1 ; Micropore volume is 0.22cm 3 g -1 . All...

Embodiment 2

[0018] Take the remaining sludge (solid content is about 20%) from a sewage plant in Shanghai, add zinc chloride solution with a concentration of 55% in a volume ratio of 1:3, fully stir on a magnetic stirrer, activate for 24 hours, and then Dry the mixture at 105°C until the moisture content is 15%. Accurately weigh 20g and put it into a high-temperature carbonization furnace, pass in water vapor as a protective gas, carry out pyrolysis and carbonization at 600°C for 30min at a heating rate of 10°C per minute, and then cool to room temperature. The solution was washed to remove zinc chloride and other inorganic substances, and then washed with distilled water until it was neutral, and then dried at 105°C to constant weight for use. According to the determination of GB7702.7-1997, the iodine value of the prepared activated carbon carbonized material is 720mg·g -1 ;The specific surface area is 487.7m 2 g -1 , the micropore volume is 0.18cm 3 g -1 . All other indicators ca...

Embodiment 3

[0020] Take the remaining sludge from a sewage plant in Shanghai, after dehydration treatment, make it have a solid content of 16%, add a zinc chloride solution with a concentration of 50% in a volume ratio of 1:2, activate for 4 hours, and then put the mixture in Dry at 105°C to a moisture content of 15%. Accurately weigh a certain amount of sample, put it into a high-temperature carbonization furnace, and carry out pyrolysis and carbonization at a temperature of 450°C for 60 minutes at a heating rate of 20°C per minute under the condition of water vapor as a protective gas, and then cool to room temperature to obtain The crude product was washed repeatedly with 3% hydrochloric acid solution to remove zinc chloride and other inorganic substances, adjusted to neutrality with distilled water, and then dried at 105°C to constant weight for later use. The iodine value of the prepared carbonized material is 580mg·g -1 ;The specific surface area is 426.1m 2 g -1 ; Micropore volu...

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Abstract

The present invention relates to the preparation process of wet sludge carbonizing adsorbent. The wet sludge carbonizing adsorbent is prepared with sludge from city sewage treating yard as main material, and through adding activator, such as zinc chloride solution, etc. commonly used in preparing active carbon to activate sludge, drying the activated sludge, pyrolytically carbonizing in a high temperature carbonizing furnace with water steam as protecting gas, cooling, washing, and stoving. Preparing adsorbent with sludge can reduce secondary pollution, lower adsorbent preparing cost and result in obvious environment benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for preparing a wet sludge carbonization adsorbent, which is a method for preparing a carbonization adsorbent by utilizing urban surplus sludge, and further realizing resource utilization of the sludge. It belongs to the field of environmental engineering technology. Background technique [0002] The treatment and disposal of sludge in urban sewage treatment plants is a hot topic in the field of environmental engineering. The preparation of carbonized materials using sludge as raw material is a method of sludge resource utilization. The research on the preparation of carbonized materials from sludge currently adopts the method of first drying the sludge, and then using the dried sludge as raw material for activation and carbonization. The disadvantage of this method is that the sludge drying treatment The high cost makes it difficult to popularize and apply this technology in actual production. (Fu-Shen Zhang, Jerom...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30
Inventor 朱南文尹炳奎寿宗奇员帅波
Owner 上海银龙水务设备公司
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