One of the primary motives of the 9th International Conference on Recent Challenges in Engineering and Technology (ICRCET-21) to be held in Bangkok, Thailand on the 20th – 21st November 2021 is to spur unique discoveries in terms of countering conventional challenges faced in everyday engineering activities and technologies. Technology is progressing at a very fast pace, which currently is weighing heavily on the earth’s bounty of natural resources and causing serious damage to the environment. The price for this large-scale and mass expansion in all forms of daily life is being paid for in the form of climate change. Today, dangerous pollution levels and global environmental degradation endangers the very existence of life on our planet.