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Published on: September 28, 2018
Rapid start-up and improvement of granulation in SBR
Sajjad Jalali1, Jalal Shayegan1, Samira Rezasoltani1
1Department of Chemical and of Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
Background:
The aim of this study is to accelerate and improve aerobic granulation within a Sequencing Batch Reactor (SBR) by cationic polymer addition.
Methods:
To identify whether the polymer additive is capable of enhancing granule formation, two SBRs (R1 and R2, each 0.15 m in diameter and 2 m in height) are used by feeding synthetic wastewater. The cationic polymer with concentration of 30 to 2 ppm is added to R2, while no cationic polymer is added to R1.
Results:
Results show that the cationic polymer addition causes faster granule formation and consequently shorter reactor start-up period. The polymer-amended reactor contains higher concentration of biomass with better settling ability (23% reduction in SVI15) and larger and denser granules (112% increase of granular diameter). In addition, the results demonstrate that the cationic polymer improve the sludge granulation process by 31% increase in Extracellular Polymer Substance(EPS) concentration, 7% increase in Specific Oxygen Uptake Rate(SOUR), 18% increase in hydrophobicity, and 17% reduction in effluent Mixed Liquor Suspended Solid(MLSS) concentration.
Conclusions:
Concludingly, it is found that using the cationic polymer to an aerobic granular system has the potential to enhance the sludge granulation process.
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