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Table 1

TN, NH₄⁺-N and biomass concentrations during the experiment (4)

Culture medium	Duration (days)	NH₄⁺-N concentration (mg NH₄-N·L⁻¹)		TN concentration (mg·L⁻¹)		Biomass concentration (g·L⁻¹)
Culture medium	Duration (days)	Initial	Final	Initial	Final	Initial	Final
Permeate	5	62.1 ± 7.6	30.5 ± 1.6	104.3 ± 1.7	41.3 ± 1.9	0.20 ± 0.03	1.51 ± 0.07
Addition of Fe, Mg, Mn, S and EDTA after 5 days	2	23.5 ± 1.4	0.073 ± 0.001	–	14.8 ± 1.6	1.58 ± 0.08	4.77 ± 0.49
Addition of Fe, S and EDTA after 5 days	2	24.2 ± 3.2	0.067 ± 0.017	–	12.1 ± 0.8	1.73 ± 0.12	3.90 ± 0.37

Culture medium	Duration (days)	NH₄⁺-N concentration (mg NH₄-N·L⁻¹)		TN concentration (mg·L⁻¹)		Biomass concentration (g·L⁻¹)
Culture medium	Duration (days)	Initial	Final	Initial	Final	Initial	Final
Permeate	5	62.1 ± 7.6	30.5 ± 1.6	104.3 ± 1.7	41.3 ± 1.9	0.20 ± 0.03	1.51 ± 0.07
Addition of Fe, Mg, Mn, S and EDTA after 5 days	2	23.5 ± 1.4	0.073 ± 0.001	–	14.8 ± 1.6	1.58 ± 0.08	4.77 ± 0.49
Addition of Fe, S and EDTA after 5 days	2	24.2 ± 3.2	0.067 ± 0.017	–	12.1 ± 0.8	1.73 ± 0.12	3.90 ± 0.37

The errors represent the standard deviations of the triplicates.