Figure 3From: Use of in-vitro experimental results to model in-situ experiments: bio-denitrification under geological disposal conditions Material balance of nitrogen species during glass ampoule experiments (Run 3 and 4) in the presence of humic acid. Run3: Initial concentrations of NO3 –, activated sludge and humic acid were 20 mmol/dm3, 1000 mg/dm3 and 100 mg/dm3 as carbon, respectively. Run4: Initial conditions = Run3, except for NO3 – = 50 mmol/dm3.Back to article page