Details

Autor(en) / Beteiligte

• Ma, Yun-Jie
• Xia, Cheng-Wang
• Yang, Hai-Yang
• Zeng, Raymond J.

Titel

A rheological approach to analyze aerobic granular sludge

Ist Teil von

• Water research (Oxford), 2014-03, Vol.50, p.171-178

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2014

Quelle

MEDLINE

Beschreibungen/Notizen

• Aerobic granular sludge is one promising biotechnology in wastewater treatment. Despite intensive researches on granular architecture and strategies to improve treatment efficiency, there are still some elusive material parameters needed to stimulate the granulation process. The main aim of this study was to evaluate aerobic granular sludge innovatively using the universal rheology methodology, in terms of processability or quality and texture. Steady shear and oscillatory measurements were performed. Basic rheological characterization showed that aerobic granular sludge was a shear-thinning Herschel–Bulkley fluid with yield pseudoplasticity. Meanwhile, granular sludge presented characterized viscoelastic behaviors in dynamic sweeps highlighting its superiority to flocculent sludge. Furthermore, a Wagner-type constitutive model incorporating a relaxation and damping function was introduced and able to describe the time-dependent and non-linear viscoelastic behaviors. This study could make a further step on predicting rheological properties, helping improve the actual sludge treatment process and the operation of sludge dewatering. [Display omitted] •Rheology was successfully applied to analyze flow behavior of aerobic granular sludge.•Rheological properties can reflect internal microstructure of granule.•Aerobic granular sludge is a Herschel–Bulkley fluid with pseudoplasticity.•Viscoelastical definition differentiates aerobic granules from flocculent sludge.•Wagner-type model can predict fluid viscoelasticity in sludge flow.