Mixotrophic cultivation of a microalga Scenedesmus obliquus in municipal wastewater supplemented with food wastewater and flue gas CO2 for biomass production

J Environ Manage. 2015 Aug 15:159:115-120. doi: 10.1016/j.jenvman.2015.05.037. Epub 2015 Jun 7.

Abstract

The biomass and lipid/carbohydrate production by a green microalga Scenedesmus obliquus under mixotrophic condition using food wastewater and flue gas CO2 with municipal wastewater was investigated. Different dilution ratios (0.5-2%) of municipal wastewater with food wastewater were evaluated in the presence of 5, 10 and 14.1% CO2. The food wastewater (0.5-1%) with 10-14.1% CO2 supported the highest growth (0.42-0.44 g L(-1)), nutrient removal (21-22 mg TN L(-1)), lipid productivity (10-11 mg L(-1)day(-1)) and carbohydrate productivity (13-16 mg L(-1)day(-1)) by S. obliquus after 6 days of cultivation. Food wastewater increased the palmitic and oleic acid contents up to 8 and 6%, respectively. Thus, application of food wastewater and flue gas CO2 can be employed for enhancement of growth, lipid/carbohydrate productivity and wastewater treatment efficiency of S. obliquus under mixotrophic condition, which can lead to development of a cost effective strategy for microalgal biomass production.

Keywords: Bio-energy; Biomass; Flue gas CO(2); Food wastewater; Scenedesmus obliquus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biofuels
  • Biomass*
  • Carbohydrate Metabolism
  • Carbon Dioxide / chemistry
  • Carbon Dioxide / metabolism*
  • Food*
  • Lipid Metabolism
  • Scenedesmus / growth & development
  • Scenedesmus / metabolism
  • Scenedesmus / physiology*
  • Wastewater / chemistry*
  • Water Purification / methods*

Substances

  • Biofuels
  • Waste Water
  • Carbon Dioxide