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Development of refined clarifier operating diagrams using an updated settling characteristics database
Author(s) -
Daigger Glen T.
Publication year - 1995
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143095x131231
Subject(s) - clarifier , settling , activated sludge , volume (thermodynamics) , sewage treatment , environmental science , environmental engineering , computer science , process engineering , engineering , physics , thermodynamics
An analysis of five sludge‐settling characteristics data sets is presented, representing data from 51 separate suspended growth biological wastewater treatment processes and including 214 separate runs and over 1 500 individual data points. The results indicate that the data can be characterized using a single relationship between the initial sludge settling velocity ( V i ), the initial sludge concentration ( C i ), and the sludge volume index (SVI). The predictive capability of this relationship is independently verified. These results suggest that this single relationship can be used to accurately characterize the settling characteristics of an activated sludge based only on the measured SVI. A comparison of alternate sludge‐settling indexes indicates that the predictive capability of the relationship can be further improved by use of the stirred SVI 3.5 analysis rather than the SVI. More data are required to refine relationships developed based on the SSVI 3.5 and the diluted SVI. Secondary clarifier‐operating diagrams based on the developed relationships are presented.