Figure 6.4 shows a competition of Methanosarcina and Methanothrix for acetate utilization during anaerobic digestion. According to the figure, Methanothrix is dominant at low acetate concentrations,...

Figure 6.4 shows a competition of Methanosarcina and Methanothrix for acetate utilization during anaerobic digestion. According to the figure, Methanothrix is dominant at low acetate concentrations, while Methanosarcina is dominant at high acetate concentration. At what acetate concentration would the two groups of anaerobic microbes have the same substrate utilization rate? Can you keep the digester operated in a way that both groups of microbes actively utilize the acetate at the same rate in a real practice? Explain