Does the feeding strategy enhance the aerobic granular sludge stability treating saline effluents?

Effects of carbon to nitrogen ratio on the performance and stability of aerobic granular sludge

“…The aerobic granulation is a self-immobilization process in which the loose biomass is converted into high-density compacted granule [1][2][3][4]. The aerobic granular sludge (AGS), compared to traditional activated sludge, has more excellent characteristics in terms of regular shape and compact structure, sedimentation, biomass accumulation, resistance to toxic compounds and high organic load, and removal efficiency of nutrient salts [5][6][7][8]. These made the AGS technique made to be widely used in treatments of high-load industrial wastewater as well as sewage [9][10][11][12].…”

“…These made the AGS technique made to be widely used in treatments of high-load industrial wastewater as well as sewage [9][10][11][12]. The stability of AGS is the most important issue in applying AGS-based process in various fields and is related many factors including the composition of influent wastewater, carbon to nitrogen (C/N) ratio, food to microorganisms (F/M) ratio, composition of extracellular polymeric substances (EPS), and rate and temperature of aeration [4,8,[13][14][15][16][17], among which, the C/N ratio of influent water is one of the most important factors for the growth of microorganism and biodegradation of nutrient salt [13,[18][19][20]. The application of AGS system, for example, into the treatment of wastewater treatment where the variance in wastewater is high was reported to be an important factor in decreased stability, degradation of granule and the growth of filamentous fungus [21][22][23][24].…”

Technologies for the treatment of saline wastewater

“…Aerobic granular sludge (AGS) for saline wastewater treatment was also used by diverse authors as an adequate technology to combat the salt inhibitory effects over biological processes. Carrera et al (2019) studied the application of different configurations (fully aerobic or anaerobic feeding) for the treatment of fish-canning wastewater with salinities between 5.0-13.5 g NaCl/L. In this study not only was the increase of salinity addressed but also, as a novelty, the effect of salinity decrease was tested.…”

Long-term stability of a non-adapted aerobic granular sludge process treating fish canning wastewater associated to EPS producers in the core microbiome

“…All these advantages have resulted in the widespread of the AGS technology at full-scale wastewater plants (Guo et al, 2020). However, the stability of granular sludge facing variable organic loads or the presence of toxics in the wastewater is still poorly reported, crucial when dealing with industrial wastewater (Carrera et al, 2019). The success of the AGS process depends on a high diversity of bacterial groups for performing carbon and nutrients removal, also involved in granule formation and stability (Weissbrodt et al, 2014;Xia et al, 2018).…”

“…Previous studies focused on AGS performance and granules stability treating fish canning wastewater with a very high salinity (Corsino et al, 2016;Corsino et al, 2017) have shown that the AGS process can be quite stable at salt concentrations up to 50 g L −1 . Carrera et al (2019) investigated the effect of different feeding strategies using an AGS process to treat fish canning wastewater, reporting that the anaerobic feeding phase might not be beneficial for the long-term stability of the AGS. These latter studies performed granulation of suspended biomass, either adapted to high salt concentration or to the fish canning wastewater, for treating sequential batches of wastewater with stable composition.…”