Abstract
Korba’s wastewater treatment plant is a conventional activated sludge, followed by three maturation ponds in series. During this study, pH, temperature, dissolved oxygen (DO), chemical oxygen demand, biochemical oxygen demand, suspended solid, and feacal bacteria were monitored.The interactions between the physicochemical and biological parameters involved in the natural disinfection process are presented and discussed. In situ analyses were also conducted to study the seasonal variation of phytoplankton, zooplankton, and daily fluctuations of physicochemical parameters. This work shows the efficiency of the maturation ponds to improve the quality of treated water from existing activated sludge treatment plants. Light has a main role in the removal of feacal coliform in maturation ponds. It has a synergistic effect with pH, DO and temperature in the ponds. Regarding the influence of the operating conditions on the decay of Escherichia coli and streptococci in the ponds, a predominance of high pH, DO, and temperature was observed. The results show a direct relationship between DO increase and pH. Improving abiotic conditions in the spring (rise in temperature, photoperiod, and light intensity) and the presence of nutrients in summer promote more algal diversity and density of Cyanobacteria (Oscillatoria), chlorophyceae (Chlamydomonas sp.), Euglenophyceae (phacus), and Diatoms (Cyclotella).
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