Cultivation of Chlorella vulgaris using nutrients source from domestic wastewater for biodiesel production: Growth condition and kinetic studies

Highlights

Chlorella vulgaris was successfully cultivated in domestic wastewater with low nitrogen and suspended solid concentration.

The growth rate of microalgae was hampered in contaminated wastewater.

High lipid yield (32.7%) was attained when the microalgae was cultivated under low nitrogen concentration.

Growth kinetic models were assessed and valid for cultivation in contaminant-free wastewater.

Abstract

Owning to the presence of essential mineral nutrient content in wastewater, cultivation of microalgae using wastewater sources provides an alternative and sustainable solution for biodiesel production. Hence, the potential of using domestic wastewater as nutrient source to cultivate Chlorella vulgaris was presently studied. It was found that the microalgae was favoured to grow in domestic wastewater under the conditions of 0.02 v/v of wastewater, initial pH of 3, and 0.03 v/v of initial amount of microalgae seed with 24 h of continuous illumination. Under these conditions, a high lipid content of 32.7% was embedded within the microalgae biomass. From the analysis of fatty acid methyl ester (FAME) profile, the extracted microalgae lipid was suitable for biodiesel production. The existing growth kinetic models were able to predict the growth of Chlorella vulgaris using the domestic wastewater as nutrients source. The fair model fitting was however limited to contaminant-free conditions, where the growth decays of the microalgae was negligible.

Keywords

  • Microalgae;
  • Biodiesel;
  • Domestic wastewater;
  • Chlorella vulgaris;
  • Growth kinetic

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