The mechanisms of granulation of activated sludge in wastewater treatment, its optimization, and impact on effluent quality
Reviewartikel, 2018

Granular activated sludge has gained increasing interest due to its potential in treating wastewater in a compact and efficient way. It is well-established that activated sludge can form granules under certain environmental conditions such as batch-wise operation with feast-famine feeding, high hydrodynamic shear forces, and short settling time which select for dense microbial aggregates. Aerobic granules with stable structure and functionality have been obtained with a range of different wastewaters seeded with different sources of sludge at different operational conditions, but the microbial communities developed differed substantially. In spite of this, granule instability occurs. In this review, the available literature on the mechanisms involved in granulation and how it affects the effluent quality is assessed with special attention given to the microbial interactions involved. To be able to optimize the process further, more knowledge is needed regarding the influence of microbial communities and their metabolism on granule stability and functionality. Studies performed at conditions similar to full-scale such as fluctuation in organic loading rate, hydrodynamic conditions, temperature, incoming particles, and feed water microorganisms need further investigations.

Granulation mechanisms

Microbial community composition

Aerobic granular sludge

Granule stability

Process performance

Wash-out dynamics

Författare

Britt-Marie Wilen

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Raquel Liebana

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Frank Persson

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Oskar Modin

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Malte Hermansson

Göteborgs universitet

Applied Microbiology and Biotechnology

0175-7598 (ISSN) 1432-0614 (eISSN)

Vol. 102 12 5005-5020

Ämneskategorier

Vattenteknik

Övrig annan teknik

Vattenbehandling

DOI

10.1007/s00253-018-8990-9