Effects of urban wastewater dilution on growth and biochemical properties of Scenedesmus sp.

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Abstract
Microalgal cultivation coupled with urban wastewater treatment can promote the large-scale production of algal biodiesel. However, most studies conducted to date have focused on effects of the nitrogen lipid production and nutrient removal, while ignoring the effects of dilution levels on the growth and biochemical properties. In this study, synthetic urban wastewater (SUW) was adopted to cultivate Scenedesmus sp. to explore the effects of dilution levels on the growth and biochemical properties, especially the lipid and protein properties. Microalgae reached maximum cell density (4.12 × 106 cell/mL) at 100% dilution, maximum specific growth rate (0.5815 d−1) at 100% dilution, maximum total lipid content (25.4%) at 25% dilution, and maximum protein content (49.97%) at 75% dilution after 5 d of cultivation. The maximum removal rate was COD 69.5 mg/L/d (100% dilution), NH3-N 7.33 mg/L/d (100% dilution) and TP 0.325 mg/L/d (75% dilution). Overall, SUW is a feasible medium for Scenedesmus sp. and 100% dilution is suggested.
Funding Information
  • Promotive Research Fund for Young and Middle-aged Scientists of Shandong Province (No. BS2014HZ019)

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