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Sludge comprehensive treatment method based on anaerobic digestion and hydrothermal carbonization

A technology of hydrothermal carbonization and anaerobic digestion, applied in water/sludge/sewage treatment, sludge treatment, sludge treatment, etc., to ensure cleanliness and environmental safety.

Active Publication Date: 2014-04-16
HANGZHOU HUHUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 comprehensive treatment method based on anaerobic digestion and hydrothermal carbonization

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Effect test

Embodiment 1

[0024] A comprehensive pollution treatment method based on anaerobic digestion and hydrothermal carbonization, including the following steps:

[0025] Step 1: Pump the liquid sludge with a moisture content of 90-98% into the heat exchanger and heat it to 50°C, and then transport it to the anaerobic digestion tank, where the liquid sludge undergoes anaerobic digestion treatment After the digested sludge is obtained, biogas is produced at the same time, and the biogas is passed to the desulfurization device, and then transported to the biogas boiler;

[0026] Step 2: Pump the digested sludge obtained through anaerobic digestion treatment in the anaerobic digestion tank in step 1 into the dehydrator for mechanical dehydration treatment, dehydrate until the moisture content of the digested sludge is 75-85%, and then transport it to the sewage The preheating treatment is carried out in the mud preheating tank, the preheating temperature is 40°C, and the preheating treatment time is...

Embodiment 2

[0032] A comprehensive pollution treatment method based on anaerobic digestion and hydrothermal carbonization, including the following steps:

[0033] Step 1: Pump the liquid sludge with a moisture content of 90-98% into the heat exchanger and heat it to 85°C, and then transport it to the anaerobic digestion tank. The liquid sludge is anaerobically digested in the anaerobic digestion tank Digested sludge is obtained and biogas is produced at the same time, and the biogas is passed to the desulfurization device, and then sent to the biogas boiler;

[0034] Step 2: Pump the digested sludge obtained through anaerobic digestion treatment in the anaerobic digestion tank in step 1 into the dehydrator for mechanical dehydration treatment, dehydrate until the moisture content of the digested sludge is 75-85%, and then transport it to the sewage The preheating treatment is carried out in the mud preheating tank, the preheating temperature is 50°C, and the preheating treatment time is 2...

Embodiment 3

[0040] A comprehensive pollution treatment method based on anaerobic digestion and hydrothermal carbonization, including the following steps:

[0041] Step 1: Pump the liquid sludge with a moisture content of 90-98% into the heat exchanger and heat it to 70°C, and then transport it to the anaerobic digestion tank, where the liquid sludge undergoes anaerobic digestion treatment After the digested sludge is obtained, biogas is produced at the same time, and the biogas is passed to the desulfurization device, and then transported to the biogas boiler;

[0042] Step 2: Pump the digested sludge obtained through anaerobic digestion treatment in the anaerobic digestion tank in step 1 into the dehydrator for mechanical dehydration treatment, dehydrate until the moisture content of the digested sludge is 75-85%, and then transport it to the sewage The preheating treatment is carried out in the mud preheating tank, the preheating temperature is 60°C, and the preheating treatment time is...

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Abstract

The invention relates to the technical field of treatment methods of municipal sludge and industrial sludge, and discloses a sludge comprehensive treatment method based on anaerobic digestion and hydrothermal carbonization. The sludge comprehensive treatment method comprises the following steps: 1, pumping liquid sludge in a heat exchanger for heating, and conveying in an anaerobic digestion tank for performing anaerobic digestion treatment to obtain digestive sludge and methane; 2, conveying the digestive sludge to a sludge preheating tank for preheating treatment after mechanical dehydration treatment; 3, injecting the digestive sludge in a hydrothermal carbonization tank, and performing hydrothermal carbonization treatment to obtain a material 1; and 4, conveying the material 1 to a reduced-pressure flash tank for reduced-pressure flash treatment to obtain a material 2; and 5, performing mechanical dehydration treatment on the material 2 to obtain semi-dry hydrothermal carbon. According to the sludge comprehensive treatment method, two technologies of anaerobic digestion and hydrothermal carbonization are integrated for treating sludge, and a process is optimized from the point of material and energy balance, a biogas energy is generated while sludge reduction is realized, the running cost of the process is reduced, the digestive sludge is treated by adopting the hydrothermal carbonization, and is converted into a hydrothermal carbon product while bacteria in the sludge are killed, and the generated hydrothermal carbon can be returned to the field for recycling, and is clean and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of treatment methods for municipal sludge and industrial sludge, in particular to a comprehensive sludge treatment method based on anaerobic digestion and 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 m 3 After sewage treatment, 5-10 tons of dewatered sludge will be produced (based on a water 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, pa...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/04C02F11/10
CPCY02E50/30Y02W10/20
Inventor 曹玉成
Owner HANGZHOU HUHUI ENVIRONMENTAL PROTECTION TECH
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