At present, the anaerobic fermentation technology of biomass wastes with microbial transformation as the core has been increasingly researched and applied. Anaerobic wet fermentation technology is currently the mainstream technology for anaerobic fermentation. However, as water resources become increasingly scarce and the environment deteriorates, the deficiencies become increasingly prominent. Wet fermentation consumes a lot of water, the volume of fermentation equipment increases, and the cost of construction increases. , And the product concentration after fermentation is low, dehydration treatment is quite difficult, if there is not enough farmland to absorb, the sewage must be treated in depth, and the investment and operation cost are high.
Anaerobic dry fermentation, also known as solid anaerobic fermentation, refers to a biological reaction process in which a high-concentration, high-viscosity fermentation substrate undergoes anaerobic conditions. The TS content in the reaction system is more than 20%, and the fermentation raw material is a solid state and a process. It is simple, the organic load of unit fermentation is high, the amount of waste liquid produced by fermentation is very small, the raw material after fermentation is high-quality organic fertilizer, and the subsequent processing is simple, which has become a research hotspot of anaerobic fermentation technology and has broad prospects. In recent years, anaerobic dry fermentation technology has received more and more attention and has achieved some research results. However, these studies mainly focus on the determination and optimization of fermentation process parameters, and on the microbial ecological mechanism of dry fermentation processes. There is relatively little research.
Dr. Yan Zhiying of the Liu Xiaofeng Research Group of the Chengdu Institute of Biology, Chinese Academy of Sciences, used response surface methodology to optimize anaerobic dry fermentation process parameters, and used high-throughput sequencing technology to analyze microbial populations during fermentation. The study found that Methanobacteria, Bacteroidia, Clostridia, Betaproteobacteria, and Gammaproteobacterias are anaerobic dry-fermentation populations. The results provide a theoretical basis for the biological regulation of anaerobic dry fermentation in the future.
The study was funded by the national “973†project 2013CB733502. The research results were based on the effects of initial substrate concentration, C/N ratio, and temperature on solid-state anaerobic digestion from composting rice straw, and were published in the recent Bioresource Technology. .
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