Method for producing mash gas from municipal sludge through dry method anaerobic fermentation

A dry-process anaerobic and municipal sludge technology, applied in the field of solid waste recycling, can solve problems such as high viscosity, difficult gas overflow, and difficult mass transfer, and achieve the effects of reducing material viscosity, volume reduction, and energy saving

Active Publication Date: 2011-01-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the difficulty of mass transfer due to the characteristics of high viscosity, no fluidity, and no porosity in the process of urban slu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1:

[0031] Take 300L of dewatered sludge from sewage plant A, put the dewatered sludge in a biological pre-drying device, stack height 1m, ambient temperature 35℃, and air supply 2m 3 Air / h, using intermittent air supply, open for 2 hours and stop for 1 hour; after 2 days of composting, the TS content is 26%, the organic content is 48%, and the C / N ratio is 9.8; the material is introduced into the acid production stage for fermentation Tank; 200L of anaerobic granular sludge taken from the UASB reactor is subjected to preliminary solid-liquid separation, the supernatant is filtered, the granular sludge is added to the material, and the mixture is evenly mixed, and then anaerobic or anaerobic static start; 7 days after start-up , Turn on the single-head double-layer spiral ribbon stirring, rotate at 10r / min, press for 30min / stop for 2h intermittently, monitor the pH of the material every 12h, and add quicklime to adjust the pH to 5.0~6.5; the acid production stage n...

Example Embodiment

[0032] Example 2:

[0033] Take 300L of dewatered sludge from sewage plant B and granulate with a granulator to make the particle size of the sludge ≤20mm; put the granulated sludge in a composting device with a pile height of 1m, an ambient temperature of 22°C, and air supply 3m 3 Air / h, using intermittent air supply, open for 2 hours and stop for 1 hour; after composting for 3 days, the TS content is 24%, the organic matter content is 52%, and the C / N ratio is 11.5; the material is introduced into the acid production stage for fermentation Tank, add 80kg of crushed straw powder; add 200L of fermented biogas residue to the material, mix well and start anaerobic or anaerobic static start; 7 days after starting, turn on single-head double-layer spiral ribbon stirring at 10r / min , Run intermittently at 30min on / off for 2h, monitor the pH of the material every 12h, and add quicklime to adjust the pH to 5.0~6.5; in the acid production stage, the biogas composition needs to be checked...

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PUM

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Abstract

The invention relates to a method for producing mash gas from municipal sludge through dry method anaerobic fermentation, which belongs to the field of solid waste reclamation, and can overcome the difficulties difficult mass transfer, difficult gas overflow and the like caused by dewatered sludge which has high viscosity, no fluidity, no gaps and the like. The method comprises the following steps of: performing biological pre-drying on the dewatered sludge, and stacking the dewatered sludge in an aerobic environment for 2 to 3 days; adding the material after the biological pre-drying into anaerobic granular sludge or biogas residues to perform inoculation, and performing static starting for 6 to 8 days; performing acidogenic fermentation on the material under an aerobic or anaerobic condition, performing spiral band type or anchor type stirring, and adjusting the pH if necessary; performing methanogenesis fermentation on the material after acid production under an anaerobic condition, performing extruding type stirring, keeping the temperature of the material to be 35+/-1 DEG C, and keeping the pH between 6.6 and 7.5; and performing refluxing inoculation on part of the biogas residues, and performing aerobic compost stabilization on the rest of the biogas residues. The method can be used for beneficial utilization of the municipal sludge and the recovery of biomass energy sources, and compared with wet fermentation, the method can save equipment investment and land occupation.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a method for producing biogas by dry anaerobic fermentation of urban sludge. Background technique [0002] The amount of dewatered sludge produced by urban sewage treatment plants due to the purification of domestic sewage is huge. At present, the annual collection capacity is about 26 million tons. The treatment and disposal of sludge in sewage treatment plants mostly use concentration and dehydration followed by landfill. This method not only occupies limited land resources, but also easily causes secondary pollution. In addition, the resource utilization rate of landfill is low, which does not conform to the principle of sustainable development in my country. In recent years, the global energy structure is undergoing a transition from fossil energy-based to the coexistence of multiple energy sources, and issues such as food security and environmental degradati...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30Y02W30/20
Inventor 董滨段妮娜戴晓虎
Owner TONGJI UNIV
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