Figure 5: Figure illustrating the possibility of driving the equilibrium state of the system from undersaturation to supersaturation state by decreasing the ammonium concentration (i.e., parameter ). The DO concentration in the water column is plotted on -axis and the saturating oxygen concentration is plotted on -axis. The dashed line and the dot-dash line represent the admissible equilibrium curves with and (0.4,2.00,9.35), respectively. Under the assumption that , the system with equilibrates in undersaturated state ( ) and it equilibrates in supersaturated state ( ) when this parameter is reduced to .