Method and device for producing methane by using dry anaerobic digestion for urban sludge and organic matter

A dry anaerobic and municipal sludge technology, which is applied in the field of solid waste recycling, can solve the problems of difficult gas overflow, difficult mass transfer, and difficult enrichment of methanogens, and achieves the benefits of enrichment, easy operation and management, and economical savings. The effect of temperature control on energy consumption

Active Publication Date: 2012-01-25
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the difficulties of mass transfer, difficult enrichment of methane bacteria and difficulty of gas overflow due to the characteristics of high viscosity, no fluidity, and no void ratio in the dry fermentation process of municipal sludge, and overcome other dry fermentation methods. The shortcoming that the equipment cannot achieve efficient microscopic mixing of sludge provides a method and device for producing biogas by dry anaerobic fermentation of municipal sludge and organic matter

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  • Method and device for producing methane by using dry anaerobic digestion for urban sludge and organic matter
  • Method and device for producing methane by using dry anaerobic digestion for urban sludge and organic matter
  • Method and device for producing methane by using dry anaerobic digestion for urban sludge and organic matter

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Embodiment 1

[0033] Such as Figure 1-3 As shown, the device is composed of a fermentation tank body, a stirring system, a temperature control and heat preservation system and a control system; the fermentation tank body 6 is lying on the support 12, the bearing and the bearing support 1 are fixed on the support 12, and the rotating shaft 8 passes through the fermentation tank. One end of the tank body 6 and the rotating shaft 8 is connected to the bearing and the bearing support 1, and the other end is connected to the shaft coupling 9, the shaft coupling 9 is connected to the transmission 10, and the transmission 10 is connected to the motor 11; the fermentation tank body 6 is provided with a feed port 5 and a discharge port 13. Sludge sampling port 14 and gas sampling port 3, the gas enters the wet bulb gas flow meter 19 after passing through the rotameter 18; the tank is equipped with a stirring system, which is composed of a rotating shaft 8, an outer spiral ring 4 and an inner spiral ...

Embodiment 2

[0036] Take 300L of dewatered sludge from sewage plant B, put it into the fermentation tank body from the feed port 5, and mix it with the fermentation biogas residue of the previous batch. At this time, the material height is about 5cm higher than the upper edge of the outer spiral ring belt 4; after mixing evenly Detect that the moisture content of the material is 80.8%, the organic matter content is 56.2%, the C / N ratio is 9.8, and the material adhesion is 45g; seal the feed inlet 5, set the stirring speed to 12r / min, turn on the motor switch, and start the fermentation; start 3 Days later, the temperature of the material measured by the temperature display device is 34°C, and the wet gas flowmeter shows that the gas production is 20L; turn on the temperature control device, set the temperature to 35°C, adjust the stirring speed to 20r / min, and set the stirring motor to turn on for 1 hour / Stop for 1 hour to run; after 8 days of operation at this stage, the moisture content...

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Abstract

The invention belongs to the field of reclamation of solid wastes, in particular relating to a method and a device for producing methane by using a dry anaerobic digestion for urban sludge and an organic matter. The device comprises a reaction chamber and a double-layer helix ribbon type agitator and is provided with a feed inlet and outlet, a sample port, a temperature-setting controller, a methane metering device, a stirring control device and others devices. The method comprises the following steps: dewatering sludge is placed into a fermentation tank for inoculation and seal, the revolving speed at start-up stage is 5-15r / min and daily stirring time is 12h, the revolving speed at acid-producing stage is 10-20r / min, intermittent operation is carried out; the daily stirring time is morethan or equal to 8h and less than or equal to 16, and starting and stopping frequency for the motor is required to be increased; temperature control is performed at acid-producing stage and methane-producing stage and material temperature is controlled to be 35+ / -1 DEG C; and after finishing the fermentation, one fourth to one third of biogas residues are left for being used as inoculum for the next batch of fermented materials and the rest of residues are discharged. The invention can be applied to reclamation treatment of the urban sludge and can obviously save equipment investment and landoccupation compared with the wet fermentation.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and specifically relates to a method and a device for producing biogas by dry-process anaerobic fermentation of urban sludge and organic matter (such as poultry manure, kitchen waste, etc.). 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, cities generate a large amount of organic waste every day, such as poultry manure and kitchen waste. The resource utilization rate of these waste landfills is low, which does not conform to the principle of sustainable development in our count...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C12P7/40C12P5/02C12M1/38C12M1/107
CPCC12M21/16Y02E50/343C12M29/18C12M21/04C12M27/06Y02E50/30
Inventor 戴晓虎董滨吴星五李国建周增炎高廷耀
Owner TONGJI UNIV
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