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近年来,由于生态环境变化和人为等因素,我国东部沿海遭受大规模浒苔侵袭的现象时有发生。开展浒苔的沼气发酵研究,一方面可以使这种优质的大型海藻类生物质原料被合理高效地利用,变废为宝;另一方面可以丰富沼气发酵原材料的种类,达到可再生能源开发的目的。该实验研究了不同颗粒大小(粗粒0.30~0.85 mm、中粒0.15~0.30 mm、细粒0.075~0.15 mm)和碱预处理法、热预处理法、酸预处理法对浒苔在高温条件下发酵产沼气的影响。研究表明,当温度为50℃、初始pH为7、接种率为10%、料液总固形物(TS)质量分数为8%的条件下厌氧发酵浒苔,粗粒组、中粒组和细粒组的浒苔挥发性固体(VS)产气率分别为386.9 mL/g、434.4 mL/g、436.5 mL/g。其中,中粒组比粗粒组产气总量提高了12.26%,细粒组比中粒组产气总量提高了0.49%。这说明粒度越小越有利于提高浒苔沼气发酵的利用率;在相同发酵条件下(同上试验),碱、热、酸预处理组分别比未预处理组产气总量提高13.14%、11.39%和3.63%。其中,碱预处理组的VS产气率最高,为493.3 mL/g,发酵过程中pH也较为稳定。因此,碱预处理法在提高浒苔厌氧发酵的沼气产量方面效果最佳。该研究的成果可为厌氧发酵浒苔生产沼气的工艺研究及生产提供参考。
In recent years, due to the change of ecological environment and man-made factors, the phenomenon of massive invasion of Enteromorpha prolifera along the eastern coast of China has occurred from time to time. To carry out research on biogas fermentation of Enteromorpha can not only make this kind of high-quality large-scale seaweed biomass raw material be utilized in a reasonable and efficient way and turn waste into treasure, on the other hand, it can enrich the types of biogas fermentation raw materials and achieve the development of renewable energy purpose. The experimental study of different particle size (coarse 0.30 ~ 0.85 mm, medium 0.15 ~ 0.30 mm, fine 0.075 ~ 0.15 mm) and alkali pretreatment, heat pretreatment, acid pretreatment Enteromorpha at high temperature conditions Under the fermentation of biogas production. The results showed that when the temperature was 50 ℃, the initial pH was 7, the inoculation rate was 10% and the total solid content (TS) was 8%, the anaerobic fermentation Enteromorpha, In the fine-grained group, the VSG of Enteromorpha prolifera were 386.9 mL / g, 434.4 mL / g and 436.5 mL / g, respectively. Among them, the total gas production in the medium-sized group was increased by 12.26% compared with that in the coarse-grained group, and that in the fine-grained group was increased by 0.49% over the medium-grained group. This indicates that the smaller particle size is more conducive to improve the utilization rate of Enteromorpha biogas fermentation; in the same fermentation conditions (same as above), total gas production in alkali, heat and acid pretreatment groups increased by 13.14% and 11.39 % And 3.63%. Among them, alkali pretreatment group VS highest gas yield, 493.3 mL / g, pH during the fermentation process is relatively stable. Therefore, alkali pretreatment method in improving the biogas production of enteromorpha anaerobic fermentation best. The research results can provide reference for the process research and production of biogas produced by anaerobic fermentation Enteromorpha.