title: Biodegradation and seasonal variations in septage characteristics.
abstract: Composite samples of septage discharging at the Khirbit As-Samra municipal wastewater treatment plant were analyzed during the period from February to the end of October 2007. Septage showed difference in concentrations of pollutants between summer and winter. The average total chemical oxygen demand (COD) of 6,425 mg/L during summer was 2.16 times greater than that in winter, which is 2,969 mg/L. The total biochemical oxygen demand (5 d) represented 45% of total COD in both winter and summer. Anaerobic biodegradability was 75% after 81 d of digestion at 35°C with a biodegradation rate constant (k) of 0.024 d⁻¹, which was lower compared with 0.103 d⁻¹ calculated for wastewater with domestic origin in Jordan. Aerobic biodegradability for septage was 48%-COD basis-after 7 d of digestion at 35°C. The lower anaerobic biodegradation rate of septage compared with that of raw wastewater of domestic origin suggested that septage could have a negative effect on the performance of a domestic wastewater treatment plant if septage discharges are not taken into account in the original design of the treatment plant.
authors.affiliation: Water and Environmental Research and Study Centre, University of Jordan, Queen Rania Alabdulla St., Amman, Jordan. halalshe@ju.edu.jo
authors.forename: Maha Mohammad
authors.initials: MM
authors.lastname: Halalsheh
authors.forename: Hanan
authors.initials: H
authors.lastname: Noaimat
authors.forename: Haifa
authors.initials: H
authors.lastname: Yazajeen
authors.forename: Joel
authors.initials: J
authors.lastname: Cuello
authors.forename: Bob
authors.initials: B
authors.lastname: Freitas
authors.forename: Manar
authors.initials: M
authors.lastname: Fayyad
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D010100:Oxygen / Q000737:chemistry; D012621:Seasons; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010100:Oxygen