MIXING CHARACTERISTICS AND PERFORMANCE OF STABILIZATION PONDS
MIXING CHARACTERISTICS AND PERFORMANCE OF STABILIZATION PONDS
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Date
1986-09
Authors
OLANREWAJU, MOSES OLADAPO
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Abstract
Influence of hydraulic properties on baffled stabilization ponds
performance was studied. The hydraulic model was studied by tracer
t e s t . From this t e s t , the Dispersion Number Index, d was evaluated
for each of the five ponds at four different hydraulic loadings. The
results of this f i r s t part of the study formed basis for the second
part which is the performance of facultative ponds.
The performance of laboratory baffled facultative ponds was investigated
by the measurement of Biochemical Oxygen Demand (BOD); Chemical
Oxygen Demand (COD) and Suspended Solids (SS) of synthetic milk waste.
Also the changes in Alkalinity, the Dissolved Oxygen (DO) and pH of
the ponds were measured.
The results show that for good efficiency, the actual (mean) detention
time must be greater or at least equal to the nominal detention time.
Also the ratio of the effective volumes of two different ponds of the
same dimension and shape is equal to the r a t i o of their actual (mean)
detention times.
Generally, excessive short-circuiting are reduced by some baffle
arrangements in the ponds. The results indicate that baffled ponds
have low values of Dispersion Index, d and exhibit flow patterns nearer
to a plug flow. The overall performance is improved by increasing the
number of baffles. Baffled ponds are analogous to ponds in series or a
stream.
A significant oxygen demand and SS are imposed on the ponds contents by
algae. In terms of organic removal and bacterial die-off, the results
indicate that baffled pond performs better than a plain pond of the
same size operating at approximately the same hydraulic and organic
loadings.
Description
A DISSERTATION PRESENTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY,
IN FULFILLMENT OF THE REQUIREMENTS
FOR THE AWARD OF THE DEGREE OF
DOCTOR OF PHILOSOPHY
(ENVIRONMENTAL HEALTH ENGINEERING)
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA
Keywords
MIXING CHARACTERISTICS,, PERFORMANCE,, STABILIZATION,, PONDS.