Water Science and Technology Vol 33 No 1 pp 3751 © IWA Publishing 1996
On-line quantification of settling properties with in-sensor-experiments in an automated settlometer
P. Vanrolleghem*, D. Van der Schueren**, G. Krikilion**, K. Grijspeerdt**, P. Willems* and W. Verstraete**
*Department Applied Mathematics, Biometry and Process Control, University of Gent, Coupure Links 653 B-9000 Gent Belgium
**Department Biochemical and Microbial Technology, University of Gent, Coupure Links 653 B-9000 Gent Belgium
An on-line settlometer has been developed. Batch settling experiments lasting 40 min are performed in a model clarifier incorporated in the sensor ("In-Sensor-Experiment"). The descent of the sludge blanket interface is monitored and the settling characteristics are deduced. The hardware consists of a 10 litre Pyrex decanter, a stirring/wall-scraping mechanism, an external light source and a moving light-intensity scanner. Either stirred or non-stirred settling curves can be recorded.
Processing of the raw data readily produces the zone or hindered settling velocity (Vs) and the (stirred) sludge volume ([S]SV). The latter can be combined with a sludge concentration measurement to determine SVI-values, and dSVIs if a dilution step is included.
Initial results are reported on a more elaborate interpretation of the data based on sedimentation models. The Takács et al. and Cho et al. models described the settling curves equally well. However, an identifiability analysis showed that not all parameters can be given unique values on the basis of the simple batch settling experiments applied in the work. More elaborate "In-Sensor-Experiments" are required to obtain complete identification.
Two years of practical experience with the device on pilot- and full-scale treatment plants revealed its robustness, low maintenance requirements and reproducible monitoring of settling curves.
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