Abstract
The concept of small scale biorefinery from lignocellulosic biomass demonstrated the efficiency of energy and environment through research works at a pilot plant of University of Technology, VNU-HCM. The concept focused on studying bioethanol production in which pretreatment is one of key steps to achieve the efficiency. The pretreatment using NaOH solution 1.0 wt % removed lignin effectively but it is not considered as an eco-friendly chemical. Therefore, this study aims to investigate the alkaline pretreatment using Sodium Bicarbonate (NaHCO3), which is argued to be more environment-friendly and quite cheap. A variety of different conditions were investigated to optimize the pretreatment, including concentration of Sodium Bicarbonate (2.0-8.0 wt%), rice straw content (2.5-10.0 wt%), reaction temperatures (from room temperature to 80oC) and soaking time (4h-32h). The optimized condition was also investigated in combination with ultrasound and stirrer. The results showed that sodium bicarbonate is of quite potential to be used in the rice straw pretreatment. In addition, the waste of water from pretreatment was utilized to absorb CO2 in Biogas which was obtained from Thai My Demonstration plant in Cu Chi District.
Highlights
The temperatures
The waste of this study aims to investigate the water from pretreatment was utilized to alkaline pretreatment using Sodium absorb CO2 in Biogas which was obtained
Tran Phuoc Nhat Uyen Phan Đinh Đong Tran Thi Tuong An Nguyen Đinh Quan Phan Đinh Tuan Ho Chi Minh city University of Technology,VNU-HCM
Summary
Việt Nam có sản lượng rơm rạ hằng năm rất dồi dào. Các nghiên cứu thế giới trong những thập niên gần đây đã chứng tỏ rơm rạ là một nguồn biomass lignocellulose có khả năng chuyển hóa thành bioethanol - một nguồn năng lượng tái tạo đầy hứa hẹn. Nghiên cứu này cũng hướng đến khảo sát tiền xử lý kiềm, loại kiềm được chọn sử dụng cho quá trình tiền xử lý rơm rạ để lên men thu ethanol là Natri bicarbonate - NaHCO3 (với tính chất hóa học gần giống với Na2CO3), giá thành khá rẻ, dễ sản xuất và thân thiện hơn với môi trường so với các loại hydroxide, lần đầu tiên được nghiên cứu ở Việt Nam. Một vấn đề gặp phải của quá trình tiền xử lý kiềm là ít thân thiện với môi trường và tốn hóa chất để trung hòa nước thải sau xử lý.
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