Effects of feeding and aeration strategies on NO production and emission by an aerobic granular sludge system for municipal wastewater treatment.

The effects of a single feeding cycle followed by a continuous aeration phase (AND) and a step-feeding cycle followed by intermittent aerobic/idle phases (AND) on the production and emission of nitrous oxide (NO) from aerobic granular sludge (AGS) from real domestic sewage were studied. Higher NO emissions were observed in the AND treatment, and 9.2 ± 4.

Biopolymers recovery: dynamics and characterization of alginate-like exopolymers in an aerobic granular sludge system treating municipal wastewater without sludge inoculum.

Alginate-like exopolymers (ALE) are present in the extracellular polymeric substances (EPS) of biological sludge such as aerobic granular sludge (AGS). The recovery of ALE from excess sludge produced by wastewater treatment plants (WWTP) is a relevant approach for the recovery of valuable products of industrial interest. However, little is known about dynamics of ALE content in sludge and associated factors.

Elucidating performance failures in use of granular sludge for nutrient removal from domestic wastewater in a warm coastal climate region.

The effects of domestic wastewater and a coastal warm climate on granular sludge and biological nutrient removal were evaluated using a pilot-scale sequencing batch reactor (SBR). The reactor operation employed two different operational strategies (OS) based on up-flow feeding regimes, defined as fast (OS1, flow rate = 18.0 L min and flow velocity = 22.

Feasibility of thermophilic anaerobic processes for treating waste activated sludge under low HRT and intermittent mixing.

Thermophilic anaerobic digestion (AD) arises as an optimized solution for the waste activated sludge (WAS) management. However, there are few feasibility studies using low solids content typically found in the WAS, and that consider uncommon operational conditions such as intermittent mixing and low hydraulic retention time (HRT). In this investigation, a single-stage pilot reactor was used to treat WAS at low HRT (13, 9, 6 and 5 days) and intermittent mixing (withholding mixing 2 h prior feeding).