超声波结合稀碱预处理玉米秸秆发酵的研究

将超声波萃取工艺结合传统的稀碱法对玉米秸秆进行发酵预处理研究。结果表明：2%NaOH溶液预处理1d，再采用双频（28kHz，60W；20kHz，900W）超声60min预处理的样品，比未做任何处理的样品产气量提高18.13%，比2%NaOH预处理3d、但未作超声处理的样品产气量提高8.58%，并且还可以节约12%的时间成本。发酵条件优化得最佳预处理方案为：固液比1∶12，单频(20kHz，900W)，超声30min。

Pretreatment of corn stover prior to fermentation by means of ultrasound and dilute alkali

A combination of ultrasonic extraction with the traditional dilute alkali process has been used to pretreat corn stover. The experimental results showed that a sample which had been pretreated with 2% NaOH solution for one day with dual frequency ultrasound (28kHz, 60W; 20kHz, 900W) for 1h was superior to that without pretreatment, in that gas production increased by 18.13%. In addition, compared to a sample pretreated with 2% NaOH solution alone for 3 days, gas production increased by 8.58%. The new method also can save 12% in time costs. A series of experiments showed that the most effective ultrasonic pretreatment conditions were 1∶12 solid to liquid ratio, with single-frequency ultrasound, for 30min.