2Chuang H P, Ohashi A, lmachi H, et al. Effective partial nitrification to nitrite by down-flow hanging sponge reactor under limited oxygen condition [ J ]. Water Res, 2007,41 (2) :295 - 302.
3Gaul T, Marker S, Kunst S. Start-up of moving bed biofilm reactors for deammonification: the role of hydraulic retention time, alkalinity and oxygen supply [ J ]. Water Sci Technol,2005,52 ( 7 ) : 127 - 133.