A method for preparing sludge charcoal by microwave-assisted hydrothermal carbonization

A hydrothermal carbonization and microwave-assisted technology, applied in the direction of pyrolysis sludge treatment, sludge treatment through temperature control, etc., to achieve good fertilization effect, wide source, easy to popularize and apply

Active Publication Date: 2016-03-02
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there has been no report on the preparation of sludge carbon by microwave-assisted hydrothermal carbonization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Feed the domestic sludge with a moisture content of 80wt% into the hydrothermal reactor, seal it, and carry out hydrothermal carbonization reaction by microwave-assisted heating. The microwave power is 200W, the pressure inside the reactor is 2.3atm, and the hydrothermal temperature is 200℃. The time is 120 minutes to obtain a hydrothermal carbonization liquid; 3000 rpm centrifugation for solid-liquid separation, the solid product is washed three times with water, and dried in an oven at 40°C to obtain sludge charcoal.

[0027] The yield of sludge charcoal is 67%, the content of organic matter is 28.97%, its available phosphorus and available nitrogen have increased by 33.26% and 36.23% respectively compared with the original sludge, and it also contains a lot of carbon and nutrients. The heavy metals were measured, and the contents of Cd and Cu in the leach solution were reduced by 88.59% and 92.21% respectively compared with the original sludge.

Embodiment 2

[0029] Feed domestic sludge with a moisture content of 85wt% into a hydrothermal reactor, seal it, and microwave-assisted heating for hydrothermal carbonization reaction. The microwave power is 400W, the pressure inside the reactor is 2.2atm, and the hydrothermal temperature is controlled at 250°C. The reaction time is 90 minutes to obtain a hydrothermal carbonization solution; centrifugation at 3500 rpm for solid-liquid separation, the solid product is washed three times with water, and dried in an oven at 50°C to obtain sludge charcoal.

[0030] The yield of sludge charcoal was 61.5%, the content of organic matter was 24.69%, and the available phosphorus and available nitrogen increased by 33.26% and 35.55% respectively compared with the original sludge. The heavy metals were measured, and the contents of Cd and Cu in the drench solution were reduced by 83.12% and 95.16% respectively compared with the original sludge.

Embodiment 3

[0032] Feed domestic sludge with a moisture content of 80wt% into a hydrothermal reactor, seal it, and heat it with microwave assistance to carry out hydrothermal carbonization reaction. for 90 minutes to obtain a hydrothermal carbonization solution; centrifuge at 3000 rpm for solid-liquid separation, wash the solid product three times with water, and dry in an oven at 40°C to obtain sludge charcoal.

[0033] The yield of sludge charcoal is 55.14%, the organic matter content is 20.47%, its available phosphorus and available nitrogen are increased by 32.62% and 36.79% respectively compared with the original sludge, and it also contains a lot of carbon and nutrients. The heavy metals were measured, and the contents of Cd and Cu in the leach solution were reduced by 94.11% and 98.28% respectively compared with the original sludge.

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Abstract

The invention discloses a method for preparing sludge charcoal by microwave-assisted hydrothermal carbonization. The sludge charcoal obtained by the method has stable quality, high content of available phosphorus and available nitrogen, has a good effect of fertilizing fields, and can effectively reduce or fix sludge heavy metal content in. The method of the invention has wide sources of raw materials, low production cost, simple and easy process steps, environmental friendliness and easy popularization and application.

Description

technical field [0001] The invention relates to regeneration treatment and resource utilization of sludge, in particular to a method for preparing sludge charcoal by microwave-assisted hydrothermal carbonization. Background technique [0002] With the popularization and operation of urban sewage treatment plants in our country, the sludge output of urban sewage treatment plants has increased rapidly. From 2001 to 2011, the annual output of sludge in my country increased from 5.67 million tons to 22.68 million tons at an average annual rate of 15%. Due to problems such as poor bioavailability and high water content (most sludges are still as high as 80% when they leave the factory), the transportation and safe disposal of surplus sludge are severely restricted. Sludge contains toxic and harmful substances such as pathogens, heavy metals and persistent organic compounds. Without effective treatment and disposal, it will easily cause secondary pollution to groundwater and soil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/18C02F11/10
Inventor 费颖恒赵丹郭亮张琳陈顺权
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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