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Method for comprehensively utilizing anaerobic digestion and carbonization of municipal sludge

A technology of anaerobic digestion and urban sludge, which is applied in the field of environmental engineering technology and ecological agriculture, can solve the problems of no comprehensive utilization method for sludge treatment, etc., achieve good heat preservation and anti-corrosion effects, easy treatment or reuse, and short construction period Effect

Active Publication Date: 2013-12-18
中船环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, anaerobic digestion treatment and disposal is the top priority of the current sludge treatment and disposal, and there is currently no comprehensive utilization method suitable for sludge treatment

Method used

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  • Method for comprehensively utilizing anaerobic digestion and carbonization of municipal sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The specific steps of a method for comprehensive utilization of municipal sludge anaerobic digestion and carbonization are as follows:

[0025] (1) Sludge Conditioning: First use physical conditioning to mix and stir the sludge and sawdust according to the mass ratio of 300:1, then add 50.0mg / L chitosan, 3.0mg / L polyacrylamide and 150.0 mg / L calcium hydroxide, so that the moisture content of the conditioned sludge is 90%, the carbon-nitrogen ratio is 15, and the pH is 6.8;

[0026] (2) Completely mixed anaerobic digestion of sludge: transfer the sludge that meets the requirements after conditioning in step (1) to the German Philips tank, and control the temperature in the German Philips tank to 35°C through the constant temperature fuzzy control system. And adjust the local temperature difference in the German Philips tank to ±0.5°C, and then stir the sludge in the tank through an intermittent mechanical stirring device with a rotational speed of 10-60r / min in the Germa...

Embodiment 2

[0031] The specific steps of a method for comprehensive utilization of municipal sludge anaerobic digestion and carbonization are as follows:

[0032] (1) Sludge conditioning: add 20mg / L chitosan and 150.0mg / L calcium hydroxide respectively, so that the moisture content of the conditioned sludge is 91%, the pH is 7.0, and the carbon-nitrogen ratio is 12.

[0033] (2) Complete mixed anaerobic digestion of sludge: transfer the sludge that meets the requirements after conditioning in step (1) to the German Philips tank, and control the temperature in the German Philips tank to 36°C through the constant temperature fuzzy control system. And adjust the local temperature difference in the German Philips tank at ±0.5°C, and then set the pneumatic stirring device in the German Philips tank to pneumatically stir the sludge in the tank, anaerobic digestion for 20 days to produce anaerobic digestion liquid and containing Biogas with 65% methane, after biogas dehydration and biogas desulf...

Embodiment 3

[0038] The specific steps of a method for comprehensive utilization of municipal sludge anaerobic digestion and carbonization are as follows:

[0039] (1) Sludge conditioning: use physical conditioning to mix and stir the sludge and sawdust according to the mass ratio of 200:1, so that the moisture content of the sludge after conditioning is 92%.

[0040] (2) Complete mixed anaerobic digestion of sludge: transport the sludge that meets the requirements after conditioning in step (1) to the German Philips tank, and control the temperature in the German Philips tank to 35.5°C through the constant temperature fuzzy control system. And control the local temperature difference in the German Philips tank at ±0.5°C, and then use the pneumatic stirring device and intermittent mechanical stirring device in the German Philips tank to simultaneously perform biogas gas stirring and intermittent mechanical stirring on the sludge in the tank to make the tank The sludge inside is subjected t...

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Abstract

The invention provides a method for comprehensively utilizing the anaerobic digestion and carbonization of municipal sludge. The method for comprehensively utilizing the anaerobic digestion and carbonization of the municipal sludge comprises the following steps: conditioning the sludge by adopting a physical or chemical or physicochemical method; then conveying into a Germany Lipp complete-mixing anaerobic digestion tank, controlling the temperature inside the Germany Lipp complete-mixing anaerobic digestion tank to 35-37 DEG C, and stirring the sludge inside the Germany Lipp complete-mixing anaerobic digestion tank to uniformly mix the sludge for anaerobic digestion treatment, so that an anaerobic digestion solution and a biogas containing 60%-70% of methane are generated; carrying out solid-liquid separation on the anaerobic digestion solution by adopting a rotational flow reactor to separate biogas residues with the water ratio of 50%-70%, and then directly mixing to the biogas residues with the water ratio of 20%-30% with wood chips or waste paper; and conveying into a high-temperature high-pressure internal heating type rotary furnace carbonization device to generate a carbonization gas and sludge biochar through anaerobic or oxygen-poor reaction. The method provided by the invention has the advantages of high biogas production efficiency, small size of the sludge biochar, convenience for transportation and storage and N, P, K nutritive element enrichment and is widely applied to the field of agriculture and the like.

Description

technical field [0001] The invention belongs to the fields of environmental engineering technology and ecological agriculture, and relates to the treatment and disposal of urban sludge, in particular to a comprehensive utilization method of anaerobic digestion and carbonization of urban sludge. Background technique [0002] In recent years, under the influence of national energy conservation and emission reduction and active fiscal policies, urban sewage treatment has developed rapidly, and urban water environment treatment has achieved remarkable results. With the continuous improvement of my country's urban sewage treatment rate, the sludge output of urban sewage treatment plants has also increased. Dramatic increase. In 2009, 1,992 urban sewage treatment plants were put into operation across the country, with a sewage treatment volume of 28 billion m 3 , about 20.05 million tons of sludge with a moisture content of 80% will be produced. With the increase of urbanization l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04C02F3/02C10B53/00C10B57/00C05F7/00C09K17/00
CPCY02A40/20Y02E50/30Y02W10/10Y02W30/40
Inventor 阳红王建华徐伟余敦耀余娅熊玲夏静鄂元武穆季平杨俊杰张传普
Owner 中船环境工程有限公司