Pathogen removal in aerobic granular sludge treatment systems

This book explores pathogen removal processes in aerobic granular sludge (AGS) wastewater treatment systems, comparing them to parallel activated sludge (CAS) systems. AGS showed similar removals to CAS configurations, with protozoa predating organisms not attached to the granules during aeration. 18S RNA gene analyses confirmed the presence of bacterivorous organisms in the system, stimulated by particulate material in the feeding. A protozoa bloom arose when co-treating with (synthetic) faecal sludge. The study contributes to a better understanding of the mechanisms behind pathogen removals in AGS systems.

Format: Paperback / softback
Length: 148 pages
Publication date: 16 February 2022
Publisher: Taylor & Francis Ltd

This comprehensive book delves into the intricate processes of pathogen removal in aerobic granular sludge (AGS) wastewater treatment systems. It meticulously tracks faecal indicators, including Escherichia coli, Enterococci, coliforms, and bacteriophages, in full-scale AGS facilities, comparing them to parallel activated sludge (CAS) systems. Notably, AGS demonstrates similar removals to more complex CAS configurations, showcasing its efficiency in treating wastewater.

In-depth laboratory-scale reactor studies reveal that the unique morphology of AGS contributes to the removal mechanisms. By tracking E. coli and MS2, it becomes evident that organisms not attached to the granules are predated by protozoa during aeration. 18S RNA gene analyses further confirm the presence of bacterivorous organisms, such as Epistylis, Vorticella, and Rhogostoma, thriving in the system. The introduction of particulate material in the feeding stimulates their development, leading to a protozoa bloom when co-treating with (synthetic) faecal sludge (4% v/v).

Furthermore, this study provides an overview of the diverse eukaryotic community in laboratory reactors and real-life applications of AGS systems. It highlights the importance of understanding these mechanisms in order to enhance pathogen removals and improve the overall performance of AGS wastewater treatment.

The microbial diversity of the influent was distinct from AGS and CAS sludge samples, although no clear differences were observed at the species level. This research contributes to a deeper understanding of the complexities involved in pathogen removals in AGS systems, paving the way for further advancements in wastewater treatment.

ISBN-13: 9781032139487