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de Graaff, D.R. (author), van Dijk, E.J.H. (author), van Loosdrecht, Mark C.M. (author), Pronk, M. (author)
For a stable operation, the aerobic granular sludge process requires mechanically strong granules in balance with the shear forces in the reactor. Despite a wide general interest in granular stability, the mechanical strength of both anaerobic and aerobic granular sludge received very little attention. In this study, a high-shear method for...
journal article 2018
document
de Graaff, D.R. (author), van Loosdrecht, Mark C.M. (author), Pronk, M. (author)
Many sources of wastewater contain sulfides, which can cause excessive growth of filamentous bacteria such as Thiothrix sp. resulting in bulking sludge in conventional activated sludge systems. Granular sludge systems could potentially also suffer from the growth of filamentous bacteria. Uptake of easily degradable COD by the relatively slow...
journal article 2020
document
de Graaff, D.R. (author), van Loosdrecht, Mark C.M. (author), Pronk, M. (author)
Seawater can be introduced or intrude in sewer systems and can thereby negatively influence biological wastewater treatment processes. Here we studied the impact of artificial seawater on the enhanced biological phosphate removal (EBPR) process performance by aerobic granular sludge (AGS) with synthetic wastewater. Process performance,...
journal article 2020
document
Feng, Cuijie (author), Welles, L. (author), Zhang, X. (author), Pronk, M. (author), de Graaff, D.R. (author), van Loosdrecht, Mark C.M. (author)
Phosphorus has been successfully eliminated from wastewater by biological techniques of enhanced biological phosphorus removal (EBPR) process, which relies on a specific microbiota of polyphosphate accumulating organisms (PAOs) that accumulate phosphate as polyphosphates (poly-P). Most methods for quantification of poly-P pools suffer from...
journal article 2020
document
de Graaff, D.R. (author), van Loosdrecht, Mark C.M. (author), Pronk, M. (author)
Abstract: Candidatus Accumulibacter phosphatis is an important microorganism for enhanced biological phosphorus removal (EBPR). In a previous study, we found a remarkable flexibility regarding salinity, since this same microorganism could thrive in both freshwater- and seawater-based environments, but the mechanism for the tolerance to saline...
journal article 2020
document
de Graaff, D.R. (author), Felz, S. (author), Neu, Thomas R. (author), Pronk, M. (author), van Loosdrecht, Mark C.M. (author), Lin, Y. (author)
Sialic acids have been discovered in the extracellular polymeric substances (EPS) of seawater-adapted aerobic granular sludge (AGS). Sialic acids are a group of monosaccharides with a nine-carbon backbone, commonly found in mammalian cells and pathogenic bacteria, and frequently described to protect EPS molecules and cells from attack by...
journal article 2019
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