Growth enhancement of biodiesel-promising microalga Chlorella pyrenoidosa in municipal wastewater by polyphosphate-accumulating organisms. (10th December 2019)

• Record Type: Journal Article
• Authors: Wang, Qing; Jin, Wenbiao; Zhou, Xu; Guo, Shida; Gao, Shu-Hong; Chen, Chuan; Tu, Renjie; Han, Song-Fang; Jiang, Jiao; Feng, Xiaochi
• Is Part Of: Journal of cleaner production. Volume 240(2019)
• Publication Date: 2019-12-10
• Subjects: Phosphorus-accumulating organisms -- Algae-bacteria interactions -- Strains screening -- Municipal wastewater -- Biodiesel-promising microalgae; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.118148
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Using municipal wastewater cultivated microalgae for bio-diesel production is an emerging research objective to relieve the water pollution and the global energy crisis. The cultivation of biodiesel-promising microalgae using municipal wastewater could simultaneously remove pollutants from the municipal wastewater and harvest biodiesel. The purpose of this study is to screen high-efficiency polyphosphate-accumulating organisms from activated sludge which can in return promote the growth of microalgae in municipal wastewater, increase the lipid production by microalgae and stabilize the effluent quality. In this study, three strains of polyphosphate-accumulating organisms with high phosphorus accumulating effect were screened, which named as L7, H7 and L10, respectively. The comparisons of co-culture with different polyphosphate-accumulating organisms and microalgae Chlorella pyrenoidosa in municipal wastewater showed that H7 had an optimal effect on the growth of microalgae. The biomass of microalgae in the H7 group reached up to 0.749 g/L. Compared with the control group, the average growth rate and lipid yield of microalgae in the stationary phase increased by 13.6% and 90.1% in the H7 group. Species identification indicated that the H7 strain belongs to Klebsiella sp. Furthermore, H7 not only promoted the microalgal growth in the co-culture system, but also enhanced the stability of total phosphorus in water. The results showed that the symbiosis of PAOs and microalgae can simultaneously promote the microalgae lipid-production and the removal of phosphorus in municipal wastewater, which provides a new understanding for microalgae bioenergy and municipal wastewater recycling. Graphical abstract: Image 1036408 Highlights: High-efficient polyphosphate-accumulating strain H7 was screened and enriched. H7 was identified as Klebsiella sp., and the P accumulation in 48 h was 9.8 mg/L. The microalgal biomass and lipid content of H7 group was up to 0.749 g/L and 26.2%. The lipid yield of H7 group was up to 0.197 g/L, which was increased by 90.1%. H7 enhanced microalgal growth and the stability of total phosphorus in sewage.