Influence of microalgae retention time on biomass production in membrane photobioreactor using human urine as substrate
Nguyen Van Thuan1, Ngo Thi Thanh Thuy1, Nguyen Hong Hai1, Nguyen Cong Nguyen2 & Xuan-Thanh Bui 1*
1Faculty of Environment & Natural Resources, Ho Chi Minh city University of Technology, VNU-HCM
2Faculty of Environment and Natural Resources, Da Lat University
Received 15 August 2018; accepted 31 October 2018
Human urine is known as the excreta with a high concentration of nitrogen and phosphorus, causing eutrophication in water bodies. In this study, human urine was used to feed microalgae (Chlorella vulgaris) in a membrane photobioreactor (MPBR) at various microalgae retention times (MRTs) and hydraulic retention time (HRT) of 2 days to evaluate its biomass production. The results indicate that MPBR was operated under MRT of 2 to 5 days and HRT of 2 days, which performed the optimum condition with biomass productivity from 146.43±8.52 to 151.93±15.05 mg/l.day. Moreover, the MPBR using the urine as a nutrient source demonstrated the high performance in biomass production and strong growth of microalgae.
Keywords: biomass production, human urine, membrane photobioreactor, microalgae, nutrient removal.