THE USE AND PERFORMANCE OF FISH FOR POLISHING EFFLUENT FROM WASTE STABILIZATION POND SYSTEM
THE USE AND PERFORMANCE OF FISH FOR POLISHING EFFLUENT FROM WASTE STABILIZATION POND SYSTEM
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Date
1986-02
Authors
ANTONIO, CO.
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Abstract
This study investigates the performance of fish in ponds for
the polishing of effluent from a waste stabilization pond system.
Two pilot ponds, each of dimensions 2m x 4m x 1.25m were
constructed, to receive the effluent from the maturation ponds of
the Ahmadu Bello University waste stabilization pond system. The
performance of the ponds in terms of the reduction in T5, 55,
Chlorophyll-a, 800 and COO, were assessed when stocked with fish
at rates of 5.0, 2.5, 1.25 and 0.0 fishes per m2. The ponds were
operated at a detention time of 5 days throughout the study.
The results show that fish population has significant
influence on the performance of the ponds. Suspended solids
removal as high as 85.6$ was observed for 5.0 fish/m2 stocking,
while operation at 0 fish/m2 often resulted in effluent with
increased S.S and chlorophyll-a concentration. A maximum COD
removal of 40$ was obtained in the pond stocked with 2.5fish/m2
while 5C0D removal as high as 77$ was achieved in the pond with
5.0 fish/m2. The ponds were able to provide some BOO removal,
though the ponds operated at 1.25 and 0.0 fish/m2 indicated
increases in BOO of up to 11.5$ and 10.7$, respectively.
One of the full-scale maturation, ponds feeding the pilot
ponds, iuas also used to investigate the rate of growth and
productivity of 300 fishes. Average fish growth rate of 0.83g/d.
or 0.14g/m2.d were observed over a period of 6 months of investigation.
Bacteriological tests on the guts and flesh of the
fishes indicated the presence of coliform bacteria, but absence
of sulphite-reducing bacteria.
Description
A Tresis submitted to the Postgraduate School, Ahmadu Bello
University, in partial fulfillment of the requirements for the
degree of:Master
of Science
(Water Resources and Environmental Engineering)
Faculty of Engineering
Ahmadu Bello University
Zaria.
February, 1986.
Keywords
PERFORMANCE,, FISH,, POLISHING EFFLUENT.,, WASTE,, STABILIZATION POND SYSTEM