Biomass production and nutrient removal by Chlorella vulgaris as monoculture and in a consortium from centrate wastewater: optimization through acclimation
Abstract
Microalgae-based wastewater treatment has shown promise in the removal of contaminants such as nutrients and heavy metals. Municipal wastewaters could be used as low-cost cultivation media as they provide the necessary nutrients for microalgal growth. This technology could represent a viable and sustainable option to implement as part of biological wastewater treatment. However, microalgal culturing requirements and conditions must be more clearly understood. At a number of wastewater treatment facilities, centrate (CW) is produced from the dewatering process of biosolids following anaerobic digestion. CW exhibits high nutrient concentrations, generally much higher than the initial influent wastewater. Therefore, CW represents a potential nutrient-rich cultivation medium for microalgal growth, but it can also be toxic for their metabolism. This study evaluated the acclimation of microalgae culture to CW diluted with secondary wastewater (SW) as a growth media following a 16-week acclimation period. Monoculture C. vulgaris and a native consortium sampled from Amhertsview water pollution facility were used. This consortium was maintained in two conditions –Bold´s Basal Medium (BBMC); and 50% CW (CWC). The initial ammonia (NH4-N) and phosphate (PO43--P) concentrations were 451.67 ± 7.82 mg/L and 22.33± 0.69 mg/L for CW, and 0.65 ± 0.10 mg/L and 1.38 ± 0.04 mg/L for SW, respectively. Results showed that the acclimation process of microalgal cultures increased their tolerance by…
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