Figure 6
Comparison of nitrate utilization between glucose (Run 12) and humic acids (Run 13) as electron donors with Azoarcus tolulyticus as the microorganism. Initial nitrate concentrations of nitrate, electron donors and microorganism are 50 mmol/dm3, 100 mg/dm3 and 1000 mg/dm3, respectively, by vial experiments. Lines are shown to help identify the general trends shown by the data.