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a use of fe 2+ Method for Improving the Stability of Continuous Dry Anaerobic Fermentation

A technology for dry anaerobic fermentation and stability, which is applied in the field of Fe2+ to improve the stability of continuous dry anaerobic fermentation. It can solve the problems of non-continuous operation, prone to acid inhibition, and high solid content, and achieve high practical application value and price. Inexpensive and effective with less dosage

Active Publication Date: 2020-10-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the operation of dry anaerobic fermentation, due to the high solid content and lack of agitation, acid inhibition is prone to occur, resulting in non-continuous operation

Method used

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  • a use of fe <sup>2+</sup> Method for Improving the Stability of Continuous Dry Anaerobic Fermentation
  • a use of fe <sup>2+</sup> Method for Improving the Stability of Continuous Dry Anaerobic Fermentation
  • a use of fe <sup>2+</sup> Method for Improving the Stability of Continuous Dry Anaerobic Fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Quantitative FeCl 2 Configure Fe 2+ Concentration of 400mg / L FeCl 2 solution, ready to use. Take fresh pig manure to measure the solid content TS. According to the solid content of pig manure, add water to adjust TS to 25%, and store the rest in a constant temperature refrigerator at 4°C. Add 600mL of pig manure with a TS of 25% above into a 1L fermenter, place the fermenter in a water bath for pretreatment at a high temperature of 70°C for 1 hour, take it out and cool it to room temperature, and add the freshly prepared FeCl 2 Solution 1mL, stir evenly, add 2mL methane strain inoculum, stir evenly, pass nitrogen gas into the fermenter for 10min, exhaust the air in the fermenter, seal with rubber stopper and sealing film, collect and measure the biogas produced by fermentation with aluminum foil sampling tape.

[0028] The continuous fermentation process is divided into two stages, the first stage is mesophilic fermentation, the fermentation temperature is set at 35°...

Embodiment 2

[0031] Take fresh pig manure to measure the solid content TS. According to the solid content of pig manure, add water to adjust TS to 25%, and store the rest in a constant temperature refrigerator at 4°C. Add 600mL of pig manure with TS of 25% above into a 1L fermenter, place the fermenter in a water bath at a high temperature of 70°C for 1 hour, take it out and cool it to room temperature, add 2mL of methane strain inoculum, stir well, and pour it into the fermenter Nitrogen was passed through the tank for 10 minutes, the air in the fermentation tank was exhausted, and the seal was sealed with a rubber stopper and a sealing film. The biogas produced by fermentation was collected and measured with an aluminum foil sampling tape.

[0032] The continuous fermentation process is divided into two stages, the first stage is mesophilic fermentation, the fermentation temperature is set at 35°C, and the time is 30d; the second stage is high-temperature fermentation, the fermentation te...

Embodiment 3

[0035] Quantitative FeCl 2 Configure Fe 2+ Concentration of 400mg / L FeCl 2 solution, ready to use. Take fresh pig manure to measure the solid content TS. According to the solid content of pig manure, add water to adjust TS to 25%, and store the rest in a constant temperature refrigerator at 4°C. Add 600mL of pig manure with a TS of 25% above into a 1L fermenter, place the fermenter in a water bath for pretreatment at a high temperature of 70°C for 1 hour, take it out and cool it to room temperature, and add the freshly prepared FeCl 2 Solution 1mL, stir evenly, add 2mL methane strain inoculum, stir evenly, pass nitrogen gas into the fermenter for 10min, exhaust the air in the fermenter, seal with rubber stopper and sealing film, collect and measure the biogas produced by fermentation with aluminum foil sampling tape.

[0036] The continuous fermentation process is divided into two stages, the first stage is mesophilic fermentation, the fermentation temperature is set at 35°...

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Abstract

The invention relates to a method for improving stability of continuous dry anaerobic fermentation by utilizing Fe2+, belonging to the technical field of biogas production by anaerobic fermentation. By changing an adding cycle of the Fe2+, a gas production rate of the continuous dry anaerobic fermentation is increased by utilizing a trace amount of Fe2+, and the effect of the Fe2+ on the stabilityof a fermentation system is investigated. Results show that when the adding cycle is 5 days, the gas production rates of the dry anaerobic fermentation at a medium temperature (35 DEG C) and a high temperature (55 DEG C) are increased significantly, and the system is stable in operation. The method provided by the invention has the advantages that an adding way is easy, the gas production amountis significantly increased, the using amount of the Fe2+ is less, the price is low, and the Fe2+ has less harm to the environment compared with other heavy metal trace elements, thereby being convenient for harmless treatment of biogas residues after fermentation.

Description

technical field [0001] The invention belongs to the technical field of biogas production by anaerobic fermentation, in particular to Fe 2+ A method for improving the stability of continuous dry anaerobic fermentation. Background technique [0002] In recent years, my country's animal husbandry has developed rapidly, and large-scale farmers and professional breeding cooperatives have increased year by year. However, a large amount of livestock and poultry manure has brought a series of environmental problems. Since most of the manure from livestock and poultry farms has not been treated and utilized, the manure carrying capacity per unit land area in the surrounding areas of large and medium-sized cities and suburban countryside is too high, and the manure of livestock and poultry is piled up randomly and enters the water system with rainwater. Therefore, livestock and poultry manure has become the third largest pollution source after industrial pollution and domestic sewage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCC02F11/04
Inventor 周北海汪少娜袁蓉芳
Owner UNIV OF SCI & TECH BEIJING
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