Recovering ammonia from ammonia-rich wastewater by vacuum stripping using a rotating packed bed

9^th World Convention on Recycling and Waste Management

October 22-23, 2018 Osaka, Japan

Min-Hao Yuan, Yi-Hung Chen and Yu-Kai Wang

China Medical University, Taiwan
National Taipei University of Technology, Taiwan

Scientific Tracks Abstracts: J Environ Anal Toxicol

Abstract :

Since the more stringent regulations on ammonia for industrial wastewater has implemented, recovery of ammonia from ammonia-rich wastewater has attracted much attention because of the idea of a circular economy. For example, the practice of semiconductor industry by using membrane distillation has generated solution of ammonium sulfate ((NH4)2SO4) more than 2000 tons/month by a company. However, (NH4)2SO4 can be re-used for only industrial propose, resulting in shortcoming in their circular economy route. This study employs vacuum stripping using a Rotating Packed Bed (RPB) to recover ammonia from ammonium sulfate wastewater into a high quality of anhydrous ammonia (Anhydrous NH3) and sodium sulfate (NaSO4), which both anhydrous NH3 and NaSO4 have a wide variety of industrial uses. The results showed that the required operation time to achieve removal efficiency above 90% and concentration of NH4-N below 5000 ppm has been reduced from 12 to 8.3 h at the initial condition of 2000 L/day (2.08 tons/day) and initial NH4-N concentration of 60,000-70,000 ppm, temperature of 55 °C and pH>13. Therefore, this study provides a new pathway for circular economy solutions for high-quality ammonium products recovered from the ammonia-rich industrial wastewater.

Biography :

Min-Hao Yuan has received his PhD in Environmental Engineering from National Taiwan University in 2011. He has also been trained from the leading universities in Japan, University of Tokyo and Tokyo Institute of Technology and the University of Michigan-Ann Arbor, USA. He was also awarded several merit-based fellowships from Taiwan, Japan and USA. He is currently working as an Assistant Professor in Department of Occupational Safety and Health, China Medical University. His research focus is about green technology and safety science with a wide range of green technology, cleaner production and safety engineering for sustainable energy industries and pollution prevention.

E-mail: mhyuan0703@gmail.com