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Table 2 Characteristics of struvite-precipitated supernatant under different NH4+:Mg2+:PO43− molar ratio and pH

From: Cultivation of lipid-producing microalgae in struvite-precipitated liquid digestate for biodiesel production

NH4+:Mg2+:PO43− molar ratio

pH

NH4+-N (mg/l)

NO3−-N (mg/l)

PO43−-P (mg/l)

N:P mass ratio

Transmittance (%)

Salinity (%)

NH4+-N removal rate (%)

1:1:0.95

8.0

142.52 ± 2.10a

0.692 ± 0.021a

35.47 ± 0.48a

4.12 ± 0.68a

70.00 ± 0.76a

0.72 ± 0.21a

81.18 ± 0.37a

8.5

118.71 ± 0.48b

0.771 ± 0.049a

29.87 ± 0.32b

4.05 ± 0.22a

71.12 ± 0.66a

0.69 ± 0.11b

83.33 ± 0.08b

9.0

78.06 ± 0.25c

0.755 ± 0.074a

26.24 ± 0.70c

3.06 ± 0.42b

71.78 ± 0.74a

0.70 ± 0.01ab

86.41 ± 0.04c

1:1:1

8.0

90.07 ± 0.08d

0.030 ± 0.019b

34.12 ± 0.39d

2.70 ± 0.73b

74.65 ± 1.33b

0.67 ± 0.07b

85.32 ± 0.01d

8.5

83.78 ± 0.82e

0.092 ± 0.076b

22.78 ± 0.51e

3.75 ± 0.04b

77.36 ± 1.34b

0.61 ± 0.08b

86.41 ± 0.14c

9.0

66.56 ± 0.52f

0.063 ± 0.048b

16.36 ± 0.07f

4.16 ± 0.23a

74.82 ± 0.86b

0.62 ± 0.08b

88.41 ± 0.09e

1:1.2:1.2

8.0

71.08 ± 1.38 g

0.053 ± 0.032b

18.92 ± 1.52 g

3.86 ± 0.57b

72.19 ± 1.53a

0.64 ± 0.03b

89.62 ± 0.24f

8.5

57.85 ± 0.66 h

0.046 ± 0.042b

8.51 ± 0.84 h

7.04 ± 0.72c

78.28 ± 0.38bc

0.66 ± 0.03b

91.63 ± 0.11 g

9.0

38.95 ± 0.74i

0.071 ± 0.016b

7.02 ± 1.21 h

5.65 ± 0.43d

79.60 ± 0.01d

0.67 ± 0.02b

93.22 ± 0.13 h

  1. Results are expressed as the mean ± SD (n = 3)
  2. a,b,cDifferent letters in the same row indicate significant differences at p < 0.05