Mohit Aggarwal, Remya Neelancherry
School of Infrastructure, Indian Institute of Technology Bhubaneswar, Odisha 752050, India.
School of Infrastructure, Indian Institute of Technology Bhubaneswar, Odisha 752050, India.
Bioresour Technol. 2023 Nov;388:129666. doi: 10.1016/j.biortech.2023.129666. Epub 2023 Aug 28.
Biochar was produced from polyculture microalgae cultivated in greywater using microwave pyrolysis. The highest biochar yield and fixed carbon content of 49.9% and 68.7% were obtained at microwave power (P) of 800 W and reaction time (T) of 8.6 min. The developed quadratic models, 166.96 - 0.23P - 3.87 T - 3.49 x10PT + 1.73 x10P + 0.13 T and - 73.79 + 0.29P + 1.86 T - 1.80 x10P could predict biochar yield and fixed carbon content respectively with errors of 6.2 and 7.9%. The volatile matter (VM), fixed carbon (FC), and high heating value (HHV) of the biomass were 69.2%. 23.4% and 17.6 MJ/Kg, respectively. VM, FC, and HHV for biochar obtained at optimum conditions were 20.2%, 68.7%, and 28.3 MJ/Kg, respectively. The process had a net positive energy balance of 11.32 MJ/Kg and energy efficiency of 1.76. This study paves the way for biochar production from greywater-grown microalgae, contributing to waste valorization and energy sustainability.
生物炭是通过微波热解处理生活污水中培养的混合微藻而产生的。在微波功率（P）为800瓦、反应时间（T）为8.6分钟的条件下，获得了最高生物炭产率49.9%和固定碳含量68.7%。所建立的二次模型166.96 - 0.23P - 3.87T - 3.49×10PT + 1.73×10P² + 0.13T²和 - 73.79 + 0.29P + 1.86T - 1.80×10P²可分别预测生物炭产率和固定碳含量，误差分别为6.2%和7.9%。生物质的挥发物（VM）、固定碳（FC）和高热值（HHV）分别为69.2%、23.4%和17.6兆焦/千克。在最佳条件下获得生物炭的VM、FC和HHV分别为20.2%、68.7%和28.3兆焦/千克。该过程的净正能量平衡为11.32兆焦/千克，能量效率为1.76。本研究为利用生活污水培养的微藻生产生物炭铺平了道路，有助于废物资源化和能源可持续性发展。
