Nghiên cứu này nhằm mục đích điều tra ảnh hưởng của nước nanobubble (NBW) đối với việc phân hủy lignin và tác động của nó lên quá trình sản xuất khí metan từ lignin. Các thí nghiệm được thực hiện trong ba giai đoạn, bao gồm việc xác định các loại nanobubble, so sánh giữa quá trình tiêu hủy đơn và đồng tiêu hủy, và tỉ lệ của lignin và axit axetic mà có thể đạt được sản lượng mêtan và sự tiêu hủy lignin cao nhất. Mời các bạn cùng tham khảo! | KỶ YẾU HỘI NGHỊ KHOA HỌC THƯỜNG NIÊN TRƯỜNG ĐẠI HỌC ĐÀ LẠT NĂM 2018 EFFECT OF NANO-BUBBLE WATER ON ANAEROBIC METHANE FERMENTATION OF LIGNIN Ho Thi Hanga b Zhang Xiaojingb Lei Zhongfangb Zhang Zhenyab a Falculty of Environment and Natural Resource Dalat University Dalat City Vietnam b School of Life and Environmental Sciences University of Tsukuba Tsukuba Japan Corresponding author Email hanght@ Abstract Vietnam is an agricultural country that generates a huge amount of crop residues lignocellulosic biomass . However the improper disposal of crop residues in Vietnam brings about many environmental problems. Anaerobic digestion AD is regarded as a suitable technology for the conversion of lignocellulosic biomass into methane that can be used for heating and electricity generation. However lignin the major barrier to the bioconversion of lignocellulosic materials can resist the hydrolysis of lignocellulose thus limiting its AD process. In recent years nanobubble technology is paid much attention in environmental field. Previous researches showed that nanobubbles have some unique properties such as stable existence in water for a long time and large generation of highly reactive free radicals that can be applied for fermentation to achieve enhanced organic degradation. Therefore this study aimed to investigate the effect of nanobubble water NBW on lignin reduction and its methane production during AD. The experiments were carried out in three phases including the determination of nanobubble categories comparison between mono-digestion and co-digestion and optimization of lignin to acetic acid ratio that can achieve the highest methane production and lignin reduction. In all the experiments the fermentation reactors were mixed with their initial pHs adjusted to 7. All the reactors 80 ml of working volume were sealed with silica gel stoppers and their headspace air was flushed with N2 to create anaerobic conditions. Finally they were placed in an incubator .
