Nutrients and COD removal of swine wastewater with an isolated microalgal strain Neochloris aquatica CL-M1 accumulating high carbohydrate content used for biobutanol production

Yue Wang, Shih Hsin Ho, Chieh Lun Cheng, Dillirani Nagarajan, Wan Qian Guo, Chiayi Lin, Shuangfei Li, Nanqi Ren, Jo Shu Chang

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

In this study, a carbohydrate-rich microalga Neochloris aquatica CL-M1 was adapted to grow in swine wastewater. The effects of cultivation conditions (i.e., temperature, light intensity or N/P ratio) on COD/nutrients removal and carbohydrate-rich biomass production were investigated. The results indicate that the highest COD removal (81.7%) and NH3-N removal (96.2%) was achieved at 150 µmol m−2 s−1 light intensity, 25 °C and N/P ratio = 1.5/1. The highest biomass concentration and carbohydrate content was 6.10 g L−1 and 50.46%, respectively, when N/P ratio = 5/1. The resulting carbohydrate-rich microalgal biomass was pretreated and used as a feedstock for butanol fermentation. With the initial sugar concentration of 48.7 g L−1 glucose and 3.4 g L−1 xylose in the pretreated biomass, the butanol concentration, yield, and productivity were 12.0 g L−1, 0.60 mol mol−1 sugar, and 0.89 g L−1 h−1, respectively, indicating the high potential of using Neochloris aquatica CL-M1 for butanol fermentation.

Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalBioresource technology
Volume242
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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