title: Removal improvement of bacteria (Escherichia coli and enterococci) in maturation ponds using baffles.
abstract: Korba wastewater treatment plant is a conventional activated sludge followed by three maturation ponds (MP1, MP2, MP3) in series acting as a tertiary treatment. The first study of wastewater treatment plants showed that the effluent concentration of Escherichia coli and enterococci at the outlet of the (MP3) varies between 10(3) and 10(4)CFU/100 ml. After the hydrodynamic study conducted by Rhodamine WT which showed short-circuiting in the MP1, two baffles were introduced in the first maturation pond (MP1) to improve the hydrodynamic and the sanitary performances. The second hydraulic study showed that the dispersion number 'd' was reduced from 1.45 to 0.43 by this engineering intervention and the Peclet number was raised from 0.69 to 2.32. The hydraulic retention time was increased by 14 h. Because of well-designed baffles, the removal efficiency of E. coli and enterococci was raised between 0.2 and 0.7 log units for the first maturation pond.
authors.affiliation: Wastewater Treatment Laboratory, Centre of Water Research and Technologies, Borj Cedria BP. 273, 8020 Soliman, Tunisia.
authors.forename: A
authors.initials: A
authors.lastname: Ouali
authors.forename: H
authors.initials: H
authors.lastname: Jupsin
authors.forename: J L
authors.initials: JL
authors.lastname: Vasel
authors.forename: L
authors.initials: L
authors.lastname: Marouani
authors.forename: A
authors.initials: A
authors.lastname: Ghrabi
mesh_terms: D016983:Enterococcus / Q000302:isolation & purification*; D004926:Escherichia coli / Q000302:isolation & purification*; D061005:Ponds / Q000382:microbiology; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods; D018508:Water Purification / Q000295:instrumentation / Q000379:methods
chemical_list: D012722:Sewage