Water Science & Technology Vol 42 No 10 pp 23–34 © IWA Publishing 2000
Performance of a system combining aerated lagoons and waste stabilization
ponds in a temperate climate
T Nameche*, O Dufayt**, H El Ouarghi*** and JL Vasel****
*
Fondation Universitaire Luxembourgeoise, Avenue de Longwy, 185,
B- 6700 Arlon, Belgium
(Tel: +32 63 23 08 49; Fax: +32 63 23 08 00) (Email: vasel@ful.ac.be)
**
Fondation Universitaire Luxembourgeoise, Avenue de Longwy, 185,
B- 6700 Arlon, Belgium
(Tel: +32 63 23 08 49; Fax: +32 63 23 08 00) (Email: vasel@ful.ac.be)
***
Fondation Universitaire Luxembourgeoise, Avenue de Longwy, 185,
B- 6700 Arlon, Belgium
(Tel: +32 63 23 08 49; Fax: +32 63 23 08 00) (Email: vasel@ful.ac.be)
****
Fondation Universitaire Luxembourgeoise, Avenue de Longwy, 185,
B- 6700 Arlon, Belgium
(Tel: +32 63 23 08 49; Fax: +32 63 23 08 00) (Email: vasel@ful.ac.be)
ABSTRACT
AbstractThe Bertrix wastewater treatment plant was designed and built
for experimental purposes, especially for comparing aerated lagoons
and stabilization ponds in a temperate climate. This plant was designed
for a capacity of 7500 inhab. eq, and aerated lagoons were dimensioned
to eliminate 50% of the organic load. The remaining load has to be
degraded in the series of stabilization ponds.
In this paper we shall present the plant in more detail and the results
of a 3-year study, i.e., 79 rounds of samples for each of the five ponds
under study, placing emphasis on the performances of aerated lagoons and
stabilization ponds. Principal components analysis (of inflow and outflow)
of aerated lagoons and stabilization ponds will be presented and commented
on. The most important factors are the hydraulic loading and the
concentrations. Seasonal variations appear only in the basins'
temperatures. The fates of nitrogen compounds are quite different from
those of organic compounds, confirming that a high efficiency of nitrogen
removal is difficult to achieve, especially for short residence times
(less than eight days).
A few other conclusions of our study are given below:
The ponds' hydrodynamics has been studied and a mathematical model
is now available
If there is no stratification in the ponds, a thermal model can be
proposed where the mean absolute difference is 0.7°C 0.2.
In the system under study, the contribution of algal biomass to the system
is very small.
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