title: Occurrence, removal and accumulation in sludge of protozoan cysts and helminth eggs in a full-scale anaerobic pond in Burkina Faso.
abstract: The present paper investigates the occurrence, removal, and accumulation of protozoan cysts and helminth eggs in a large anaerobic pond treating municipal wastewater of Ouagadougou (Burkina Faso). With a hydraulic retention time of 6.5 days, the anaerobic pond achieved 100% removal of helminth eggs and protozoan cysts most of the time, except during the hot period. The average residual concentrations of helminth eggs and protozoan cysts in the effluent were respectively 0.45 eggs/L (minimum 0 and maximum 3), and 5.4 cysts/L (minimum 0 and maximum 26). Protozoan cysts accumulation in sludge averaged 1,613 cysts/g total solids. Ancylostoma duodenale, Ascaris lumbricoides and Hymenolepis nana were the main helminth species found in the sludge. After 7 years of operation, the sludge in the pond still contained a high level of viable helminth eggs evaluated at 42%.
authors.affiliation: Institut International d'Ingénierie de l'Eau et de l'Environnement: 2iE, Rue de la Science, 01 BP 594 Ouagadougou 01, Burkina Faso. yacouba.konate@2ie-edu.org
authors.forename: Yacouba
authors.initials: Y
authors.lastname: Konaté
authors.forename: Amadou Hama
authors.initials: AH
authors.lastname: Maiga
authors.forename: Didier
authors.initials: D
authors.lastname: Basset
authors.forename: Bernadette
authors.initials: B
authors.lastname: Picot
authors.forename: Claude
authors.initials: C
authors.lastname: Casellas
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D002050:Burkina Faso; D006376:Helminths / Q000302:isolation & purification*; D010063:Ovum / Q000502:physiology*; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*; D014873:Water Pollutants / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods
chemical_list: D012722:Sewage; D014873:Water Pollutants