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Table 5 Ammonium (NH4-N) and phosphate (PO4-P) removal rates (mg L−1 Day−1) at no (NTC), partly (PTC), and full temperature control (FTC) and at a controlled day temperature combined with low night temperature (LN)

From: Biomass production and removal of ammonium and phosphate by Chlorella sp. in sludge liquor at natural light and different levels of temperature control

 

Level of T control

Experiment (number of days)

1 (6)

2 (9)

3 (3)

4 (3)

5 (3)

NH4-N (mg L−1 day−1)

NTCα

16.5a

(±1.6)

19.2a

(±0.0)

28.4a

(±5.5)

24.6b

(±0.2)

28.4a

(±5.5)

PTCα

12.7b

(±0.2)

18.1b

(±0.3)

32.7a

(±0.6)

32.6a

(±1.3)

32.7a

(±0.6)

FTCα

16.8a

(±0.9)

20.0a

(±0.2)

31.1a

(±2.8)

35.0a

(±1.7)

31.1a

(±2.8)

LNα

15.1ab

(±0.8)

17.1b

(±0.6)

   

PO4-P (mg L−1 day−1)

NTCα

2.4

(±0.1)

1.3

(±0.1)

2.9

(±0.6)

3.7

(±0.1)

2.3

(±0.1)

PTCα

2.3

(±0.1)

1.3

(±0.1)

2.8

(±0.1)

3.8

(±0.1)

2.3

(±0.3)

FTCα

2.3

(±0.4)

1.3

(±0.2)

2.9

(±0.1)

3.7

(±0.1)

2.6

(±0.2)

LNα

2.3

(±0.2)

1.5

(±0.2)

   
  1. Average values and standard deviations in parenthesis, n = 3
  2. αA different letter denotes significant differences (p < 0.05), between the levels of T control