Abstract
Experiments on wastewater treatment in high-rate algal ponds (HRAPs) were conducted at Rabat (Morocco). The results indicate a BOD removal of 88%, while N-NH 4 + and P-PO 4 3− removals reached 69 and 52%, respectively. Investigations on faecal coliforms (FC), pathogens (Salmonella) and helminth egg (nematodes) removals by the treatment system showed that (i) the design parameters of the HRAP play an important role in (FC) die-off. It is demonstrated that high FC die-off was obtained throughout the year when the area/volume ratio of the HRAP reached 3.3 m −1 while seasonal variations were recorded for lower figures of this ratio; (ii) a complete removal of Salmonella sp.; and (iii) a complete removal of the nematode eggs initially found in the raw wastewater particularly those of the Ascaris and Trichuris genera.
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