Le T.S.Bui X.T.Thong P.M.D.Nguyen P.T.Nguyen V.T.Vo T.K.Q.Nguyen P.D.Le D.T.Lin K.Y.A.Visvanathan C.Mahidol University2024-03-132024-03-132024-01-01Journal of the Taiwan Institute of Chemical Engineers (2024)18761070https://repository.li.mahidol.ac.th/handle/20.500.14594/97569Background: Microalgae-based technologies show promise due to their efficient absorption of nutrients and biomass production. Method: The study focuses on a Revolving Algae Biofilm Reactor (RABR), a novel technology with a large sunlight-exposed surface area within a comparatively smaller footprint. This study aimed to determine the optimal nitrogen loading rate (NLR) for maximizing biomass growth and nutrient removal efficiency in a RABR system, employing both synthetic wastewater (first stage) and actual wastewater (second stage). Significant findings: The first stage using synthetic wastewater achieved a biomass productivity peak of 16.6 g/m2.d at the highest NLR (0.03 kg N/m3.d). Chlorophyll-a concentrations correlated positively with nitrogen loading, peaking at 12.6 mg/L at NLR of 0.02 kg N/m3.d, indicating enhanced photosynthetic activity. The second stage, utilizing real wastewater from post-anaerobic treatment, showed lower biomass productivity (2.8 g/m2.d) with notable Chemical Oxygen Demand (COD) removal efficiencies (70.2 %). NH4+-N removal dynamics varied, with an initial boost at NLR of 0.02 kg N/m3.d and followed by a decrement at NLR of 0.03 kg N/m3.d.Chemical EngineeringChemistryArticleSCOPUS10.1016/j.jtice.2024.1054172-s2.0-85186588208