6Abubaker J,Risberg K,Pell M.Biogas residues as fertilisers-effects on wheat growth andsoil microbial activities[J].Applied Energy,2012(99):126-134.
7Zhu Songming,Chen Shulin.Effects of organic carbon on nitrification rate in fixed film biofilters[J].Aquacultural Engineering,2001,25(1):1-11.
8Kim Y M,Cho H U,Lee D S,et al.Influence of operational parameters on nitrogen removal efficiency and microbial communities in a full-scale activated sludge process[J].Wat Res,2011,45(17):5785-5795.
