1. Smith D, O’Neill N, Doris Y, Moriarty J (2004) Urban waste water discharges in Ireland with population equivalent greater than 500 persons: a report for the years 2002 and 2003. Irish EPA, Ireland
2. Boller M (1997) Small wastewater treatment plants—a challenge to wastewater engineers. Water Sci Technol 35:1–12
3. Odegaard H, Rusten B (1980) Nitrogen removal in rotating biological contactors without the use of external carbonaceous source. In: Proceedings of the first national symposium/workshop on rotating biological contactor technology, vol. 1. Champion, Pennsylvania, pp 1301–1317
4. APHA (1995) Standard methods for the examination of water and wastewater, 19th edn. American Public Health Association, Washington
5. Tanyolaç A, Beyenal H (1996) Effectiveness factor for a hollow-fiber biofilm reactor at maximum substrate consumption. Chem Eng J 62:149–154