The transformation of conventional flocculent sludge to aerobic granular sludge (AGS) biologically removing carbon, nitrogen and phosphorus (COD, N, P) is still a main challenge in startup of AGS sequencing batch reactors (AGS-SBRs).
Subsequently, the domestic waste undergoes a transformation process wherein sludge, consisting mainly of human feces, is collected in a closed anaerobic detention tank in a cellar and introduced into a bioreactor, enabling the production of biogas by methanogenesis; this biogas is then stored and used for cooking and HVAC equipment.
The thermal behavior, structural morphology, phase composition, and phase transformation of the stabilized sludge were investigated by using thermal gravimetry-differential scanning calorimetry, scanning electron microscopy and X-ray diffraction.
Plant-wide modelling approaches provide opportunities to study the dynamics and interactions of different transformations in water and sludge streams.
At environmentally relevant concentrations, AgNP absorption to sludge and aging in soil (even after transformation) cause toxic effects on soil microorganisms of the terrestrial ecosystem.
Low levels of P transformations detected in the nEBPR70 sludge's cycle study were consistent with the absence of EBPR (Table 1 and Fig. S1D).
Such transformation and stabilization occurred regardless of the sludge source and type, and were primarily caused by the changes in sludge properties associated with decomposition of organic matter and sulfide.
Reactor cycle studies demonstrate that the three sludges carried out metabolic transformations typical of EBPR (Table 1, Fig. S1).
Through identification of highly expressed proteins from a mixed culture activated sludge system this study provides functional evidence of microbial transformations important for enhanced biological phosphorus removal (EBPR).
Based on Ag K-edge XANES results, the results demonstrate that the absence of activated sludge in influent wastewater had a considerable effect on AgNP transformation (Table 1).
