期刊
JOURNAL OF CLEANER PRODUCTION
卷 240, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2019.118211
关键词
Nutrients removal; Growth; Flocculating; Lipid; Nitrogen sources; Microalgae
资金
- Natural Science Foundation of China [31700310]
- Key Scientific Development Project of Shanxi Province, China [FT-2014-01-15]
- Social Development Foundation of Shanxi, China [201603D321008, 201803D31020]
- Fund for Shanxi 1331 Project
A microalga with high self-flocculating efficiency was isolated and identified as Scenedesmus rubescens SX. When S. rubescens SX was cultivated in ammonium-containing wastewater, the pH of wastewater was significantly acidic and inhibited the growth of the microalga. By adjusting the pH of ammonium-containing wastewater, both the growth and nutrients removal were enhanced and superior to those from nitrate-containing wastewater. The flocculation of S. rubescens SX was also affected by nitrogen sources. When S. rubescens SX was cultivated in nitrate-containing wastewater, more extracellular polymeric substances (EPS) with rich hydroxyl and carboxyl groups as binding sites for flocculation were produced. Moreover, positively charged precipitates of magnesium and calcium salts were formed via high pH induction. These precipitates neutralized negative charge groups from EPS, and S. rubescens SX exhibited the highest flocculating efficiency in nitrate-containing wastewater. The flocculation of S. rubescens SX in ammonium-containing wastewater was mainly due to the neutralization between negative charge groups from EPS and protons released by pH reduction. Moreover, the lipid content of the microalga ranged from 22.44% to 25.80%, which typically consisted of linoleic and linolenic acids (48.85%-55.24%) for dietary supplements and aquacultures. In short, it is a very promising avenue for integrating wastewater treatment and flocculation for harvesting biomass for lipid production by a newly isolated self-flocculating microalga S. rubescens SX. (C) 2019 Elsevier Ltd. All rights reserved.
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