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Treatment of low C/N ratio wastewater and biomass production using co-culture of Chlorella vulgaris and activated sludge in a batch photobioreactor
- Zhu, Shunni, Qin, Lei, Feng, Pingzhong, Shang, Changhua, Wang, Zhongming, Yuan, Zhenhong
- Bioresource technology 2019 v.274 pp. 313-320
- Chlorella vulgaris, activated sludge, bacteria, biofuels, biomass production, carbon nitrogen ratio, chemical oxygen demand, coculture, feeds, microalgae, nutrients, photobioreactors, soil conditioners, wastewater
- The aim of this work was to study the performance of pollutants removal and biomass production by co-culture of Chlorella vulgaris and activated sludge in a batch photobioreactor (PBR), compared with their single system to treat a low C/N ratio (COD/N = 4.3) wastewater. The co-culture system surpassed activated sludge system in terms of nutrients removal and outperformed microalgae alone system in regard to COD removal. Biomass productivity of the co-culture system was 343.3 mg L−1 d−1, and the harvested biomass could be developed as biofuels, animal feeds or soil conditioners due to the improved calorific value and cellular composition compared with activated sludge. The low C/N ratio wastewater enabled bacteria to maintain a relatively low level, hence in favor of microalgae enrichment and nutrient recovery.