Abstract
Microalgae cultivation using wastewater is an economically viable and environmentally friendly method for generating bio-based products and treating different types of wastewaters. However, previous studies showed that frigon wastewater (FW) could not be used to cultivate Chlorella sorokiniana because of its high salinity and turbidity. In this work, FW was diluted with reeling wastewater (RW) (RW + FW) and distilled water (D + FW) to reduce the salinity and turbidity and concurrently balance the nutrient profiles. Results showed that C. sorokiniana grew well on RW + FW and D + FW because of their similar nutrient profiles to a common algal growth medium (tris-acetate‑phosphorus medium). Hence, these solutions are suitable for microalgal cultivation using FW. Nutrients in cooking cocoon wastewater, RW + FW, and D + FW were effectively removed by this algal species with removal efficiencies of 38.9–60.4% total nitrogen, 49.4–94.9% total phosphorus, and 80.0–86.6% chemical oxygen demand. Moreover, contents of pigments, carbohydrates, proteins, and lipids in the algal biomass were changed substantially in accordance with the nutrient profiles of wastewaters. Therefore, this dilution strategy effectively changes the nutrient profiles of FW and makes it a suitable culture medium for microalgae cultivation.
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