Table 2.

Effect of artificial light on bioremediation efficiency, biomass, and lipid yield of S. obliquus on day 21 of incubation during winter^a

Parameter	Initial concn	Control (without artificial light)	Light intensity (μE m−2 s−1)b				Aquaculture limitc
			20	30	50	70
Orthophosphate (mg liter−1)	8.3 ± 0.18	ND	ND	ND	ND	ND	<0.2
Ammonium (mg liter−1)	8.6 ± 0.26	ND	ND	ND	ND	ND	<1.0
Nitrate (mg liter−1)	4.2 ± 0.33	0.62 ± 0.05	0.58 ± 0.04	0.55 ± 0.04	0.46 ± 0.07	0.41 ± 0.04	<150
Nitrite (mg liter−1)	0.89 ± 0.09	ND	ND	ND	ND	ND	<2.0
TOC (mg liter−1)	14.2 ± 0.51	1.5 ± 0.04	1.3 ± 0.03	0.84 ± 0.04	1.2 ± 0.03	1.2 ± 0.03	<30
COD (mg liter−1)	211.3 ± 8.2	47.2 ± 0.52	53.1 ± 0.82	41.3 ± 0.55	48.1 ± 0.35	51.7 ± 0.32	<200
BOD (O2 mg liter−1)	102.5 ± 4.8	24.7 ± 0.68	24.3 ± 0.50	18.7 ± 0.58	20.4 ± 0.24	21.3 ± 0.18
DO (mg liter−1)	3.8 ± 0.22	6.7 ± 0.04	6.6 ± 0.04	6.3 ± 0.07	6.8 ± 0.06	6.7 ± 0.05	>5
pH	7.6 ± 0.06	8.8 ± 0.04	8.9 ± 0.05	8.7 ± 0.11	8.8 ± 0.12	8.7 ± 0.09	>6.5
Biomass yield (g liter−1)	0.04 ± 0.01	0.48 ± 0.04	0.54 ± 0.09	0.57 ± 0.06	0.60 ± 0.04	0.62 ± 0.06
Lipid yield (mg liter−1)	5.2 ± 0.04	98.2 ± 1.2	100.9 ± 3.7	113.2 ± 2.9	116.5 ± 3.3	129.8 ± 3.1

^aAll values are means ± standard errors (n = 3). ND, not detected.

^bArtificial light was provided for 2 h.

^cFrom reference 11.