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Method for aerobic composting of sludge by using straw-sludge based activated carbon

An aerobic composting and activated carbon technology is applied in the preparation and application of sewage/sludge fertilizers and organic fertilizers to achieve good application prospects, shorten the composting cycle, and prolong the duration of high temperature composting.

Inactive Publication Date: 2017-07-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sludge disposal methods, such as landfill and incineration, reduce the sludge content, but at the same time, new environmental problems will arise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of straw-sludge-based activated carbon: Take 10 kg of dehydrated sludge and straw, dry it completely in a freeze dryer at -40 °C, fully grind it through a ball mill, and pass it through a 100-mesh sieve. The ratio is 2:1, stir and mix well, add 2mol / L CaCl 2 The solution was fully stirred and mixed, heated in a water bath at 35 °C for 12 h, dried completely in a 105 °C oven, and placed in a muffle furnace at 450 °C for 30 min to prepare straw-sludge-based activated carbon.

[0022] (2) Aerobic composting of sludge: Mix excess sludge, sawdust and straw-sludge-based activated carbon in a mass ratio of 100:30:5, and the compost mass is 19 kg. The air flow was controlled to be 0.35m³ / h, and aeration was performed every 10 minutes, and the aeration time lasted 1 minute.

[0023] After adding straw-sludge base, the activated carbon pile was maintained above 55 °C for 6 d, and without adding straw-sludge base, the activated carbon pile was maintained above 55 ...

Embodiment 2

[0025] (1) Preparation of straw-sludge-based activated carbon: Take 10 kg of dehydrated sludge and straw, dry it completely in a freeze dryer at -50 °C, fully grind it through a ball mill, and pass it through a 160-mesh sieve. According to the mass of sludge: straw The ratio of 3:1 was fully stirred and mixed, and 2.5 mol / L CaCl was added. 2 The solution was fully stirred and mixed, heated in a water bath at 40 °C for 24 h, dried completely in a 105 °C oven, and heated in a muffle furnace at 500 °C for 45 min to make straw-sludge-based activated carbon.

[0026] (2) Aerobic composting of sludge: Mix excess sludge, sawdust and straw-sludge-based activated carbon in a mass ratio of 100:30:10, and the compost mass is 19 kg. The air flow was controlled to be 0.40m³ / h, aeration was performed every 15 minutes, and the aeration time lasted 2 minutes.

[0027] After adding straw-sludge-based activated carbon, the stack was maintained above 55 °C for 8 d, and without adding straw-slud...

Embodiment 3

[0029] (1) Preparation of straw-sludge-based activated carbon: Take 10 kg of dehydrated sludge and straw, dry it completely in a freeze dryer at -60 °C, fully grind it through a ball mill, and pass it through a 200-mesh sieve. According to the mass of sludge: straw The ratio is 4:1, stir and mix well, add 3mol / L CaCl 2 The solution was fully stirred and mixed, heated in a water bath at 45 °C for 36 h, dried completely in a 105 °C oven, and placed in a muffle furnace at 550 °C for 60 min to make straw-sludge-based activated carbon.

[0030] (2) Aerobic composting of sludge: Mix excess sludge, conditioner and straw-sludge-based activated carbon in a mass ratio of 100:30:15, and the compost mass is 19 kg. The air flow was controlled to be 0.45m³ / h, and aeration was performed every 20 minutes, and the aeration time lasted 3 minutes.

[0031] After adding straw-sludge-based activated carbon, the pile was maintained above 55 °C for 5 d, and without adding straw-sludge-based activat...

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PUM

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Abstract

The invention discloses a method for aerobic composting of sludge by using straw-sludge based activated carbon, and belongs to the technical field of sludge composting. The method comprises the following steps: preparing straw-sludge based activated carbon, and performing aerobic composting of sludge, namely adding the straw-sludge based activated carbon into the sludge composting for aerobic composting. The straw-sludge based activated carbon has a sufficient specific surface area and a porous structure, so that flowing resistance of oxygen is reduced, and the oxygen storage capacity is increased. Compared with composting without the straw-sludge based activated carbon, the method has a high temperature period increased by 3-6 days, a highest temperature increased by 8 DEG C, a composting cycle shortened by 4-5 days, and has very good application prospects.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method for aerobic composting of sludge by utilizing straw-sludge-based activated carbon. Background technique [0002] In recent years, my country's sewage treatment industry has developed rapidly, and the daily sewage treatment has exceeded 100 million tons. The rapid development of sewage treatment capacity and treatment rate has resulted in a substantial increase in the output of sludge. The sludge contains a large amount of refractory organic matter, heavy metals, salts and volatile substances, as well as pathogens and parasite eggs, posing a threat to the biological security of the environment. The traditional sludge disposal methods, such as landfill, incineration, etc., although reducing the sludge content, but also accompanied by the emergence of new environmental problems. [0003] Sludge aerobic composting is that under artificial control condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05F17/00
CPCC05D9/00C05F17/00C05F5/002C05F7/00C05F11/00Y02W30/40
Inventor 尹华卢妙杨萍萍
Owner SOUTH CHINA UNIV OF TECH
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