EP1837310-A2  FURUKAWA K ET AL: "Nitrification of NH4-N polluted sea water by immobilized acclimated marine nitrifying sludge (AMNS)" JOURNAL OF FERMENTATION AND BIOENGINEERING, SOCIETY OF FERMENTATION TECHNOLOGY, JP LNKD- DOI:10.1016/0922-338X(93)90251-3, vol. 76, no. 6, 1 January 1993 (1993-01-01), pages 515-520, XP025826086 ISSN: 0922-338X [retrieved on 1993-01-01];  ROSTRON W M ET AL: "Nitrification of high strength ammonia wastewaters: comparative study of immobilisation media" WATER RESEARCH, ELSEVIER, AMSTERDAM, NL LNKD- DOI:10.1016/S0043-1354(00)00365-1, vol. 35, no. 5, 1 April 2001 (2001-04-01), pages 1169-1178, XP004314793 ISSN: 0043-1354;  MATSUMURA M ET AL: "Rapid nitrification with immobilized cell using macro-porous cellulose carrier" WATER RESEARCH, ELSEVIER, AMSTERDAM, NL LNKD- DOI:10.1016/S0043-1354(96)00361-2, vol. 31, no. 5, 1 May 1997 (1997-05-01), pages 1027-1034, XP004058641 ISSN: 0043-1354;  CHANG I S ET AL: "The influence of poly-vinyl-alcohol (PVA) characteristics on the physical stability of encapsulated immobilization media for advanced wastewater treatment" PROCESS BIOCHEMISTRY, ELSEVIER, NL LNKD- DOI:10.1016/J.PROCBIO.2005.02.009, vol. 40, no. 9, 1 September 2005 (2005-09-01), pages 3050-3054, XP025306726 ISSN: 1359-5113 [retrieved on 2005-09-01];  VOGELSANG C ET AL: "Functional stability of temperature-compensated nitrification in domestic wastewater treatment obtained with PVA-SbQ/alginate gel entrapment" WATER RESEARCH, ELSEVIER, AMSTERDAM, NL LNKD- DOI:10.1016/S0043-1354(97)00009-2, vol. 31, no. 7, 1 July 1997 (1997-07-01), pages 1659-1664, XP004480263 ISSN: 0043-1354;  FURUKAWA K ET AL: "Nitrogen pollution of leachate at a sea-based solid waste disposal site and its nitrification treatment by immobilized acclimated nitrifying sludge" JOURNAL OF FERMENTATION AND BIOENGINEERING, SOCIETY OF FERMENTATION TECHNOLOGY, JP LNKD- DOI:10.1016/0922-338X(94)90014-0, vol. 77, no. 4, 1 January 1994 (1994-01-01), pages 413-418, XP023573521 ISSN: 0922-338X [retrieved on 1994-01-01]US7842185-B2  Research Process for Environmental Microbial Engineering, p. 123, Gihodo Shuppan Co., Ltd. (1993).;  Water Treatment by Microogranism Immobilization Process: Pellet Immobilization Process, Entrapping Immobilization Process, Biologically Activated Carbon Process, published by NTS Inc. (2000).;  Standard Methods for Examination of Water, 2001 edition, Japan Water Works Association (2001).;  Water Treatment Engineering, p. 204, Gihodo Shuppan Co., Ltd. (1976).