Sludge treatment method based on hydrothermal carbonization

A hydrothermal carbonization and sludge treatment technology, which is applied in the directions of dehydration/drying/concentrated sludge treatment, sludge treatment through temperature control, and pyrolysis treatment of sludge, etc., to achieve simple equipment, strong adjustable application scale, and ease The effect of the greenhouse effect

Inactive Publication Date: 2014-04-30
HANGZHOU HUHUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lot of room for improvement in terms of process performance (such as treatment efficiency, hydrothermal carbon yield, hydrothermal carbon performance, waste heat utilization, etc.)

Method used

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  • Sludge treatment method based on hydrothermal carbonization

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Comparison scheme
Effect test

Embodiment 1

[0028] Sludge treatment methods based on hydrothermal carbonization, such as figure 1 shown, including the following steps:

[0029] (1) Sludge preheating treatment: input the dewatered sludge in the sludge storage bin into the preheating tank for preheating treatment, the preheating temperature is 50°C, the preheating treatment time is 3h, and the moisture content of the sludge is adjusted 75%;

[0030] (2) Hydrothermal carbonization: Inject the preheated sludge into the hydrothermal carbonization tank, add citric acid, adjust the pH value of the material in the hydrothermal carbonization tank to 5.0, and control the reaction temperature in the hydrothermal carbonization tank to 180°C. Hydrothermal carbonization reaction 6h;

[0031] (3) Recovery and utilization of waste heat: transport the material after hydrothermal carbonization treatment to the flash tank, reduce it to normal pressure and then transport it to the heat exchanger;

[0032] (4) Dehydration and drying: the...

Embodiment 2

[0035] Sludge treatment methods based on hydrothermal carbonization, such as figure 1 shown, including the following steps:

[0036] (1) Sludge preheating treatment: input the dewatered sludge in the sludge storage bin into the preheating tank for preheating treatment, the preheating temperature is 60°C, the preheating treatment time is 2.5h, and the moisture content of the sludge is adjusted 80%;

[0037] (2) Hydrothermal carbonization: Inject the preheated sludge into the hydrothermal carbonization tank, add acetic acid, adjust the pH value of the material in the hydrothermal carbonization tank to 6.2, control the reaction temperature in the hydrothermal carbonization tank to 200 °C, water Thermal carbonization reaction 5h;

[0038] (3) Recovery and utilization of waste heat: transport the material after hydrothermal carbonization treatment to the flash tank, reduce it to normal pressure and then transport it to the heat exchanger;

[0039] (4) Dehydration and drying: the...

Embodiment 3

[0042] Sludge treatment methods based on hydrothermal carbonization, such as figure 1 shown, including the following steps:

[0043] (1) Sludge preheating treatment: input the dewatered sludge in the sludge storage bin into the preheating tank for preheating treatment, the preheating temperature is 70°C, the preheating treatment time is 2h, and the moisture content of the sludge is adjusted 80%;

[0044] (2) Hydrothermal carbonization: Inject the preheated sludge into the hydrothermal carbonization tank, add citric acid and acetic acid, adjust the pH value of the material in the hydrothermal carbonization tank to 5.6, and control the reaction temperature in the hydrothermal carbonization tank to 260 ℃, hydrothermal carbonization reaction for 3h;

[0045] (3) Recovery and utilization of waste heat: transport the material after hydrothermal carbonization treatment to the flash tank, reduce it to normal pressure and then transport it to the heat exchanger;

[0046] (4) Dehydra...

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Abstract

The invention relates to a treatment method of sludge generated by urban sewage treatment plant and industrial sludge and discloses a sludge treatment method based on hydrothermal carbonization. The sludge treatment method comprises four steps: sludge preheating treatment, hydrothermal carbonization, waste heat recovery and dehydration desiccation. By adopting the sludge treatment method, as the sludge is converted to hydrothermal carbon by adopting a hydrothermal carbonization technology, pathogenic microorganisms in the sludge are completely killed, most heavy metal pollutants in the sludge are dissolved out, and organic toxic substances in the sludge are effectively decomposed, so that the energy recovery utilization rate is high, and the sludge treatment method is clean, environment-friendly, rapid and effective and has high product additional values.

Description

technical field [0001] The invention relates to a treatment method for sludge and industrial sludge produced by an urban domestic sewage treatment plant, in particular to a treatment method for sludge based on hydrothermal carbonization. Background technique [0002] A large amount of sludge will be generated during sewage or wastewater treatment. Taking urban sewage treatment plants as an example, every 10,000 cubic meters of sewage will produce 5 to 10 tons of dewatered sludge (based on a moisture content of 80%). According to the requirements of my country's "Twelfth Five-Year Plan" National Urban Sewage Treatment and Reuse Facilities Construction Plan, by 2015, the scale of urban sewage treatment in my country will reach 208.05 million cubic meters per day. Based on this estimate, only urban sewage treatment plants in my country will 37.97-75.94 million tons of dewatered sludge will be produced every year; in addition to urban sewage treatment plants, papermaking, food p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/18C02F11/10C02F11/12
Inventor 曹玉成
Owner HANGZHOU HUHUI ENVIRONMENTAL PROTECTION TECH
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