| Abstract: | Since the living microorganisms in activated sludge continuously change, it is difficult to conduct controlled experiments
and achieve reproducible results for evaluating sludge characteristics. Synthetic sludge, as a chemical surrogate to activated
sludge, could be used to investigate the sludge physicochemical properties, and it is desirable to prepare synthetic sludge
with similar structure and properties to real activated sludge to explore the flocculation and settlement processes in activated
sludge systems. In this work, a high-strength synthetic sludge was prepared with functional polystyrene latex particles as
the framework and extracellular polymeric substances (EPS) to modify its surface. The flocculation and settling characteristics
of the microspheres and the prepared synthetic sludge were tested. Compared with other three functional polystyrene latex
microspheres, the synthetic sludge prepared with EPS-modified polystyrene latex microspheres showed good settling characteristics
and a significantly higher strength. They could be used for studying the physicochemical properties of activated sludge. |
