Application of on-line monitoring system for solid-state fermentation based on CO₂ gas content

In order to measure CO₂ gas content in Baijiu solid state fermentation pit online, the feasibility and wide application of real-time monitoring of solid-state fermentation process in Huangochre production center of Luzhou Laojiao, the variation trend of CO₂ gas content in pit was compared during fermentation process under different loading-pit grains conditions. The results showed that within 50 d of fermentation, the CO₂ gas content in the pit first experienced a rapid rise stage, reaching about 90% of the peak value, and then entered a stable period lasting nearly 10 d. Finally, the CO₂ gas content in the pit showed a decrease rate of about 1% per day until the end of fermentation. This parameter could reflect the normal state of fermented grains in solid-state fermentation process and provide a reliable real-time on-line monitoring method for the monitoring of solid-state fermentation process. This monitoring method overcame the shortcomings of the traditional sampling and inspection method which caused damage to the solid-state fermentation environment, and greatly improved the detection efficiency and convenience.