Start-up of aerobic granular sludge (AGS) reactors inoculated with granular sludge from a full-scale plant Comparison of organics and nutrients removal from synthetic wastewater and granule development in lab-scale AGS sequencing batch reactors
Typ
Examensarbete för masterexamen
Program
Publicerad
2021
Författare
Ardiati, Fenny Clara
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Aerobic granular sludge (AGS) has shown to be a promising sustainable technology for
wastewater treatment due to compact treatment, energy-efficient and its ability to treat
different contaminants such as organic matter, nutrients, and xenobiotic compounds,
including pharmaceuticals. The present study aimed to evaluate the AGS development
and process performances during the start-up period by using AGS as the inoculum.
Three lab-scale sequencing batch reactors (R0, R1, R2) were used and fed by complex
synthetic wastewater: two reactors (R0 and R1) were dosed with pharmaceutically
active compounds (PhACs). The results showed that the start-up period which lasted
for 44 days was limited by nitrogen removal and low biomass concentration in all
reactors. Despite the disturbance of operational conditions during the operation,
granulation was observed and good settling properties with SVI15/SVI5 ratio > 0.9, SVI5
of 29−79 mL/g, and average diameter of 2.2−3.67 mm was maintained. Dense and
compact granules were predominant in R0 and R1 while R2 had fluffy and loose
structured granules. An average of 86−89% TOC removal, 57−100% TP removal, and
51−62% TN removal was observed. It can be concluded that AGS seeding sludge
indeed contributed to a rapid AGS start-up with no acclimation period of TOC and TP
removal and increasing granule sizes which are beneficial for conversion processes.
Further research such as a cycle study and optimization of operational conditions are
recommended for better understanding of the conversion processes and optimal AGS
performance.
Beskrivning
Ämne/nyckelord
aerobic granular sludge , seeding , reactor start-up , nutrients removal , pharmaceutical wastewater , sequencing batch reactors