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Method for improving straw methane yield through pure ammonia wet process soaking normal temperature pretreatment

A pretreatment, straw technology, applied in fermentation, waste fuel and other directions, can solve the problem of long ammonia pretreatment time, shorten the anaerobic fermentation cycle, enrich the N source of the output, and improve the gas production performance.

Active Publication Date: 2012-12-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The digestion period is 70 days. Compared with the method without ammonification pretreatment, the cumulative gas production of this method has increased by 8-38%. Compared with the sodium hydroxide pretreatment method, this method will not cause secondary pollution. At the same time, there is no need to adjust the carbon-nitrogen ratio, but its disadvantage is that the ammoniation pretreatment takes a long time, and no specific research has been made on the total methane production

Method used

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  • Method for improving straw methane yield through pure ammonia wet process soaking normal temperature pretreatment
  • Method for improving straw methane yield through pure ammonia wet process soaking normal temperature pretreatment
  • Method for improving straw methane yield through pure ammonia wet process soaking normal temperature pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh three parts of straw, the amount of each part is 52g (calculated in TS), and evenly mix 2% of the dry weight of the straw with a certain amount of water and spray it on the crushed straw, add a certain amount of water to the straw Water and 25%NH in 3 ·H 2 The water in O is 30%, 60%, 75% and 90% of the dry weight of straw, and 2% of pure ammonia is converted to 25% NH 3 ·H 2 The amount of O was 4.16mL, and the amount of additional water was 17mL, 74mL, 206.40mL and 472mL. The pretreated straw was sealed and sealed in a ziplock bag, and pretreated at 30°C for 96 hours. The control group was rice straw pretreated with 30% moisture content and non-pretreated rice straw.

[0023] The pretreated straw was mixed with 12g of anaerobic sludge, added to the anaerobic digestion reactor, and tap water was added to 80% of the reactor volume. Put the reactor filled with nitrogen gas and sealed after adding the materials into a shaker at 32°C for shaking. Record the daily...

Embodiment 2

[0032]Weigh three parts of straw, the amount of each part is 52g (calculated in TS), and evenly mix 4% of the dry weight of the straw with a certain amount of water and spray it on the crushed straw, add a certain amount of water to the straw Water and 25%NH in 3 ·H 2 The water in O is 30%, 60%, 75% and 90% of the dry weight of straw, and 4% of pure ammonia is converted to 25% NH 3 ·H 2 The volume of O was 8.32mL, and the additional water volumes were 14mL, 72mL, 207.45mL and 478mL. The pretreated straw was sealed in a ziplock bag, and pretreated at 30°C for 96 hours. The control group was rice straw pretreated with 30% moisture content and non-pretreated rice straw.

[0033] The pretreated straw was mixed with 12g of anaerobic sludge, added to the anaerobic digestion reactor, and tap water was added to 90% of the volume of the reactor. Put the reactor filled with nitrogen gas and sealed after adding the materials into a shaker at 37°C and shake it. The daily gas product...

Embodiment 3

[0042] Weigh three parts of straw, the amount of each part is 52g (calculated in TS), and evenly mix 6% of the dry weight of the straw with a certain amount of water and spray it on the crushed straw, add a certain amount of water to the straw Water and 25%NH in 3 ·H 2 The water in O is 30%, 60%, 75% and 90% of the dry weight of straw, and 6% of pure ammonia is converted to 25% NH 3 ·H 2 The amount of O was 12.48mL, and the additional water was 12mL, 71mL, 208.49mL and 484mL. The pretreated straw was sealed in a ziplock bag, and pretreated at 30°C for 96 hours. The control group was rice straw pretreated with 30% moisture content and non-pretreated rice straw.

[0043] The pretreated straw was mixed with 12g of anaerobic sludge, added to the anaerobic digestion reactor, and tap water was added to 80% of the reactor volume. Put the reactor filled with nitrogen gas and sealed after adding the materials into a shaker at 37°C and shake it. The daily gas production is recorde...

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Abstract

The invention discloses a method for improving the straw methane yield through straw pretreatment. According to the method, ammonia water and water are mixed and are uniformly sprayed onto straws placed in a sealed bag so that the straws are in a wet soaking state, and the pretreatment is carried out for 90 hours to 110 hours under the normal temperature condition. The pretreatment effect is improved through regulating different moisture contents in the wet type soaking state, and in addition, the methane content in the methane is obviously improved in the anaerobic fermentation process. Results show that the straws pretreated under the condition of 60 to 90 percent of moisture content at the normal temperature can fast enter the methane production peak period, and in addition, the anaerobic fermentation period is effectively shortened. When the pure ammonia concentration is 2 to 6 percent, when the moisture content is 60 to 90 percent, T80 is shortened by 23.23 to 50.1 percent, 9.30 to 50.1 percent and 9.30 to 25.5 percent through being compared with that of 43 days without the treatment. When the result is applied to the practical engineering, the engineering scale can be reduced by one time, and the investment cost is greatly reduced. Meanwhile, through being compared with that of straws which are not pretreated, the unit VS methane yield is respectively improved by 5.09 to 14.63 times, 1 to 16.1 times and 1.6 to 10.15 times.

Description

technical field [0001] The invention belongs to the field of anaerobic fermentation of organic solid waste. Specifically, it relates to a method for increasing the content of methane produced by anaerobic fermentation of straw through pretreatment of straw. Background technique [0002] my country has always been a big producer of straw. More than ten years ago, straw was an indispensable production and living material in the vast rural areas, and almost all straw would be fully utilized. However, with the rapid development of agriculture and the change of rural energy structure, a large amount of straw is accumulated and cannot be fully utilized, resulting in serious waste. Rice straw production is the highest in my country, so how to make full use of excess rice straw has always been a research hotspot. [0003] At present, anaerobic digestion technology is a method that can effectively convert straw into clean energy to realize resource energy utilization. However, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 李秀金张亚甜袁海荣邹德勋朱保宁
Owner BEIJING UNIV OF CHEM TECH
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