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Key parameters in sludge dewatering: testing for the shear sensitivity and EPS content.
H Mikkelsen1, T Mascarenhas, P H Nielson
1Department of Environmental Engineering, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark.
Summary
This study introduces a laboratory method to measure extractable extracellular polymeric substances (EPS) and shear sensitivity (k(ss)) for improved sludge dewatering. These parameters optimize dewatering performance and reduce sludge volume.
Area of Science:
- Environmental Science
- Chemical Engineering
- Water Treatment
Background:
- Extracellular polymeric substances (EPS) and shear sensitivity (k(ss)) are critical for sludge dewatering efficiency.
- These parameters influence dewatered sludge dry matter content, dewatering rate, and conditioner demand.
Purpose of the Study:
- To present a unified laboratory method for determining extractable EPS and k(ss).
- To discuss the implications of these parameters for sludge processing and minimization.
Main Methods:
- Utilized a single laboratory test reactor for simultaneous measurement of EPS and k(ss).
- Applied the characterization method to practical sludge processing scenarios.
Main Results:
- Demonstrated the effectiveness of the laboratory method in quantifying key dewatering parameters.
- Provided examples of applying the characterization to optimize sludge treatment.
Conclusions:
- The described method allows for accurate assessment of sludge dewaterability.
- Characterizing EPS and k(ss) is crucial for efficient sludge management and developing sludge minimization strategies.