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Novel wood fiber raw material anaerobic fermentation process

A lignocellulosic raw material, anaerobic fermentation technology, applied in the direction of fermentation, waste fuel, etc., can solve the problems of large amount of alkali, easy acidification, heavy pretreatment workload, etc., to reduce the amount of alkali, reduce the volume, and improve the processing capacity Effect

Inactive Publication Date: 2009-07-08
NANJING UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of large amount of alkali, heavy pretreatment workload, and easy acidification in the fermentation process in the current alkali soaking pretreatment. The method of reducing the amount of alkali under the premise of improving

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  • Novel wood fiber raw material anaerobic fermentation process

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Embodiment 1

[0026] Cut the harvested lignocellulosic raw materials into small pieces of 1-2 cm by mechanical or manual methods, then put them into an anaerobic reactor, add inoculum for inoculation, mix, and the amount of inoculum added is 5% of the dry weight of the fermented product ~30%. Close the fermentation device, the gas outlet of the fermentation device is connected to the gas storage device through the gas transmission pipe, the reaction temperature is controlled at 35±1°C, the fermentation product is stirred by the stirring device during the fermentation process, and biogas can be generated within 24 hours. Afterwards, the gas production decreased significantly, and the reaction ended. The pre-fermented lignocellulosic raw material is taken out and dried, and the pre-fermented lignocellulosic raw material becomes loose and porous, with a volume reduction of more than 40% and a quality reduction of nearly 50%. Use 2% to 8% NaOH solution to soak the pre-fermented lignocellulosic...

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Abstract

The invention discloses a wood fiber raw material anaerobic fermentation technology, including: crushing the wood fiber raw material, adding into a single-phase anaerobic reactor, and adding the inoculum for inoculation, mixing; regulating the TS load to 2 - 8%, sealing the reactor, performing anaerobic fermentation to produce methane; taking out the wood fiber raw materials in the anaerobic reactor after the peak of gas production, airing; using the NaOH solution to soak the raw materials; adjusting the pH of the wood fiber raw material after soaking to 6.8 - 7.5, adding the inoculum for fermentation inoculation once again. The invention performs anaerobic fermentation once more to the wood fiber raw material after anaerobic pre fermentation and alkali soaking to produce methane, the alkali consumption is decreased by 50 percent on the precondition that the wood fiber raw material biology conversion rate is largely elevated, the aerogenes cycle is considerable to that of the traditional alkali soaking pre-treatment, and the acid inhibitory effect is avoided in the anaerobic fermentation process, thereby having good economic and environmental benefits.

Description

technical field [0001] The invention belongs to the field of renewable energy development and utilization and environmental protection, and specifically relates to an anaerobic fermentation process of lignocellulosic raw materials. Background technique [0002] Today, as fossil energy is gradually exhausted, the impact of energy shortage on the world has become increasingly prominent, and the world has begun to focus on the field of new energy. Among many new energy sources such as solar energy, nuclear energy, water energy, and biomass energy, biomass energy is the safest and most stable energy source, and it is also a new energy field that is currently encouraged by the state. The world's biomass resources are huge and diverse, including all terrestrial plants, aquatic plants, human and animal excreta, and industrial organic matter. Among all kinds of biomass available for human use, lignocellulosic raw materials account for the vast majority. At present, the energy util...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 郑正陈广银邹星星罗燕方彩霞罗兴章张继彪高顺枝冯景伟赵国华伦琳王卫平
Owner NANJING UNIV
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