Improvement Of Settling Tank Performance
Using Inclined Tube Settlers
Author(s)
K. Fujisaki & M. Terashi
Abstract
The newly developed settler is an application of the lamella settler, which
arranges inclined parallel plates in the vertical direction, contrary to the usual
horizontal arrangement. In this method, the separated clear water is removed
directly by suction from the top end of the parallel plates. For the removal of
clear water, the right and left edges of the plates are closed, to make a tube with a
rectangular cross section. These are the unique and original features of the
equipment. Since each settling tube acts as a small settling tank, the treatment
capacity is proportional to the number of settling tubes. Based on the results of
the laboratory and on-site experiments, it is shown that the new tube settler
system is very effective for the enhancement of settling tank performance. It is
also shown from a numerical estimation that the settling tank installed with the
new system has extremely high performance compared with the conventional
settling tank.
Keywords: settling tank, tube settler, lamella settler, overflow rates, treatment
capacity.
1 Introduction
In combined sewerage systems, storm waters often exceed the capacity of the
treatment plant, which may cause environmental problems. To meet this
problem, the enhancement of settling tank capacity is an important and urgent
issue to the sewage treatment plant in the city. To improve the performance of
the space limited settling tank, the lamella settler is widely used (for example,
Takayanagi et al [1], Bridoux et al [2], Daligault et al [3], Kolisch and
Schirmer [4]).
Keywords
settling tank, tube settler, lamella settler, overflow rates, treatment
capacity.
Related Book
Other papers in this volume
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