Overall, nitrification system took place in aerobic biological filters, shown by fluctuating levels of N-NO3 higher output than input. Nitrobacter formed and flourish in conditions of low substrate concentrations. Therefore, the model more effective treatment, the higher microbiological density, length of term, the microbial membrane ability to metabolize N-NH3 into N-NO3 as favorable. However, low nitrogen content leads to the ability to generate low nitrates.
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