Analysis of denitrifiion performance and microbial community ...
· Wheatrice stone was added as a powder to explore the effect of its addition on the denitrifiion process in the BER. The wheatrice stone mainly consisted of 65% SiO 2, 15% Al 2 O 3, 4% Na 2 O, 4% K 2 O, 1–% Fe 2 O 3, 2–3% CaO, 1–% FeO, and a few MgO, TiO 2, MnO and P 2 O 3 ( Li et al. 2009 ; Hong et al. 2012 ).