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Hindered and compression solid settling functions - Sensor data collection, practical model identi fi cation and validation
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DOI：10.1016/j.watres.2020.116129.png)
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摘要
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Secondary settling tanks (SSTs) are the most hydraulically sensitive unit operations in activated sludge water resource recovery facilities (WRRF). Mathematical models for predicting activated sludge solids settling velocity include parameters that show irreducible epistemic uncertainty. Therefore, reliable and periodic calibration of the settling velocity model is key for predicting activated sludge process capacity, thus averting possible failures under wet-weather flowand filamentous bulking conditions. The two main knowledge gaps addressed here are: (1) Do constitutive functions for hindered and compression settling exist, for which all velocity parameters can be uniquely estimated? (2) What is the optimum sensor data requirement of developing reliable settling velocity functions? Innovative settling column sensor and full-scale data were used to identify and validate amended Vesilind function for hindered settling and a new exponential function for compression settling velocity using one-dimensional and computational fluid dynamics simulations. Results indicate practical model identifiability under well -settling and filamentous bulking conditions. (c) 2020 Elsevier Ltd. All rights reserved.
Keyword:
Hindered and compression solid settling
velocity
Compression solid concentration and
effective solid stress
Settling column sensor
One-dimensional model
Computational fluid dynamics (CFD)
Practical model identification
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期刊
IF:
12.4
论文数:
3.1W
被引数:
15.7W
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