day 12 of the study with lowest COD and BOD values at
128 and 45 mg L-1, respectively. The removal efficiency
was measured as 23% and 45%, respectively compared with
initial wastewater (no nutrient supplement) (Fig. 3).
Afterwards, COD and BOD values were quite stable until
the end of the study. As the control using no nutrient
supplement, it was found that the algae had longer
adjustment period than those fed nutrient supplements as
indicated by quite consistent COD and BOD, which had the
lowest values at day 6 with COD at 76 mg L-1 and BOD at
32 mg L-1. The removal efficiency was measured 54% and
61%, respectively. Afterwards, COD and BOD values
slightly increased continuously, because of the mortality of
algae by starving. After dying, algae were decomposed and
released nutrient into water (Chuntapa et al., 2003).
Resultantly, COD and BOD values slightly increased
continuously at the end of the study.
day 12 of the study with lowest COD and BOD values at128 and 45 mg L-1, respectively. The removal efficiencywas measured as 23% and 45%, respectively compared withinitial wastewater (no nutrient supplement) (Fig. 3).Afterwards, COD and BOD values were quite stable untilthe end of the study. As the control using no nutrientsupplement, it was found that the algae had longeradjustment period than those fed nutrient supplements asindicated by quite consistent COD and BOD, which had thelowest values at day 6 with COD at 76 mg L-1 and BOD at32 mg L-1. The removal efficiency was measured 54% and61%, respectively. Afterwards, COD and BOD valuesslightly increased continuously, because of the mortality ofalgae by starving. After dying, algae were decomposed andreleased nutrient into water (Chuntapa et al., 2003).Resultantly, COD and BOD values slightly increasedcontinuously at the end of the study.
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