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Method for improving fermentation capability of slurry dry process

A technology for dry fermentation and inoculation of sludge, applied in the field of solid waste recycling, can solve the problems of insufficient methane-producing substrates, slow hydrolysis and acidification process, and slow fermentation process, so as to accelerate the hydrolysis and acidification process, promote decomposition, and speed up fermentation. effect of the process

Inactive Publication Date: 2011-04-20
TONGJI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of slow hydrolysis and acidification process, insufficient methanogenic substrate, and slow fermentation process due to the large amount of refractory substances and microbial residues in the material in the dry fermentation process of municipal sludge, and provide an improved Method for dry sludge fermentation performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 20kg of dewatered sludge from sewage plant A, add an appropriate amount of water, and adjust the moisture content to 87%; heat the material in a microwave heater with a frequency of 915MHz and a power of 10kW for 5 minutes, and the moisture content of the material after heating is measured to be 80%; Cool the sludge after microwave pretreatment to 35±1°C, mix it evenly with 6kg of dewatered sludge without pretreatment, put it into an anaerobic fermentation tank, turn on the temperature control device, and control the temperature of the material during the fermentation process to 35±1°C 1°C, start statically for 3 days; turn on the stirring motor at a speed of 15r / min, run the stirring motor for 1 hour and stop for 1 hour; start the gas metering and collection device; feed in and out 500g per day, and the feed is dehydrated sludge pretreated by microwave ; Monitor material pH, gas production and gas production components every 3 days, and the fermentation process can...

Embodiment 2

[0026] Take 20kg of dewatered sludge from sewage plant B, add an appropriate amount of water, and adjust the moisture content to 90%; heat the material in a microwave heater with a frequency of 915MHz and a power of 10kW for 8 minutes, and the moisture content of the material after heating is measured to be 80%; Cool the sludge after microwave pretreatment to 55±1°C, mix it evenly with 7kg of fermented biogas residue in the previous stage, put it into the anaerobic fermentation tank, turn on the temperature control device, control the temperature of the material during the fermentation process to 55±1°C, and statically Start for 2 days; turn on the stirring motor at a speed of 15r / min, turn on the stirring motor for 1 hour and stop for 1 hour; start the gas metering and collection device; feed and discharge 900g per day, and the feed is dehydrated sludge pretreated by microwave; monitor every 2 days Material pH, gas production and gas production components, the fermentation pro...

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Abstract

The invention provides a method for improving the fermentation capability of a slurry dry process, belonging to the field of solid waste recycling, which can be used for solving the problems that reacted intermediate products and energy are difficult to transmit and diffuse in a medium resulted from the large viscosity of reaction matrix and high total solid (TS) concentration; slow hydrolysis acidification and low aerogenesis speed are caused by that a large amount of substances difficult to degrade exist in slurry and the further biotransformation is limited by the microbial residue cell-wall structure. In the method, dewatered slurry is placed in microwave of which the frequency is 915MHz and the power is 10-60kW for carrying out pretreatment for 3-10 minutes; the pretreated dewatered slurry is cooled to the selected fermentation temperature, and then mixes with seed slurry uniformly based on the mass ratio of 5: 1-3:1 to obtain a mixture which is placed in an anaerobic fermentation tank for standing for 3-5 days in a sealing and non-stirring state; a stirring motor is started, and the stirring speed is controlled to 10-30r / min; and materials are fed and discharged continuously so as to ensure the materials to stay in the anaerobic fermentation tank for 40-60 days. The method for improving the fermentation capability of the slurry dry process can be used to reduce the slurry viscosity and improve the dry fermentation rate and gas production rate; and in addition, the method for improving the fermentation capability of the slurry dry process can be used to save equipment investment and land occupancy compared with the wet fermentation.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a method for improving the performance of sludge dry fermentation. 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 degradation have ...

Claims

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Application Information

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IPC IPC(8): C02F11/04
Inventor 董滨段妮娜何群彪戴晓虎
Owner TONGJI UNIV
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