Heterotrophic organic nitrogen

Figure 10.12 Modeled controls on the heterotrophic organic nitrogen (HON) and percentage of HON based on the ratio of respired allochthonous inputs (Alloc. Resp.) in different aquatic systems. AON, allochthonous organic nitrogen AP, allochthonous production. (Modified from Caraco and Cole, 2003.)...

Bronk, D.A., Glibert, P.M., Malone, T.C., Banahan, S., and Sahlsten, E. (1998) Inorganic and organic nitrogen cycling in Chesapeake Bay autotrophic versus heterotrophic processes and relationships to carbon flux. Aquat. Microb. Ecol. 15, 177-189. 

Characterization of a satisfactory DO profile. A typical steady-state simulation of DO profiles in a plug flow reactor will illustrate the ideas. Ammonia-nitrogen from the influent flow is consumed by both nitrifying and heterotrophic organisms, fig 11. In a completed reaction the NH4-N approaches zero before the outlet. The Nitrosomonas oxygen demand is shown in fig 12. 

Berg, G. M., Repeta, D., and LaRoche, J. (2002). Dissolved organic nitrogen hydrolysis rates in axenic cultures of Aureococcus anophagefferens (Pelagophyceae) Comparison with heterotrophic bacteria. Appl. Environ. Microbiol. 68, 401—404. 

Figure 33.12 A schematic box diagram of the Hood et al. (2001,2004) ecosystem model. The state variables are dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), phytoplankton (P), Trichodesmium (T), heterotrophs (H), and detritus (D). Redrawn and modified with permission from Hood et al. (2004).

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