Print Email Facebook Twitter Effects of micro-bubble aeration on the pollutant removal and energy-efficient process in a floc-granule sludge coexistence system Title Effects of micro-bubble aeration on the pollutant removal and energy-efficient process in a floc-granule sludge coexistence system Author Liu, Minghui (Zhengzhou University) Wang, Ju (Zhengzhou University) Peng, Z. (TU Delft Sanitary Engineering; Zhengzhou University) Date 2023 Abstract To investigate energy-saving approaches in wastewater treatment plants and decrease aeration energy consumption, this study successfully established a floc-granule coexistence system in a sequencing batch airlift reactor (SBAR) employing micro-bubble aeration. The analysis focused on granule formation and pollutant removal under various aeration intensities, and compared its performance with a traditional floc-based coarse-bubble aeration system. The results showed that granulation efficiency was positively associated with aeration intensity, which enhanced the secretion of extracellular polymeric substances (EPSs) and facilitated granule formation. The SBAR with the micro-aeration intensity of 30 mL·min-1 showed the best granulation performance (granulation efficiency 52.6%). In contrast to the floc-based system, the floc-granule coexistence system showed better treatment performance, and the best removal efficiencies of NH4+-N, TN, and TP were 100.0, 77.0, and 89.5%, respectively. The floc-granule coexistence system also enriched higher abundance of nutrients removal microbial species, such as Nitrosomonas (0.05-0.14%), Nitrospira (0.14-2.32%), Azoarcus (2.95-12.17%), Thauera (0.43-1.95%), and Paracoccus (0.76-2.89%). The energy-saving potential was evaluated, which indicated it is feasible for the micro-aeration floc-granule coexistence system to decrease the aeration consumption by 14.4% as well as improve the effluent. Subject energy savinggranular sludgemicro-bubblesequencing batch airlift reactor To reference this document use: http://resolver.tudelft.nl/uuid:8c79e3ea-7b18-433f-9e3d-d392e7b5373a DOI https://doi.org/10.2166/wst.2023.376 ISSN 0273-1223 Source Water Science and Technology, 88 (11), 3044-3055 Part of collection Institutional Repository Document type journal article Rights © 2023 Minghui Liu, Ju Wang, Z. Peng Files PDF wst088113044.pdf 1.03 MB Close viewer /islandora/object/uuid:8c79e3ea-7b18-433f-9e3d-d392e7b5373a/datastream/OBJ/view