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The collaborative effect of Chlorella vulgaris-Bacillus licheniformis consortia on the treatment of municipal water

Xiyan Ji, Huimin Li, Jibiao Zhang, Hexige Saiyin, Zheng Zheng
Journal of hazardous materials 2019 v.365 pp. 483-493
Chlorella, DNA methylation, ammonium, chemical oxygen demand, municipal wastewater, nuclear genome, organic matter, orthophosphates, phosphorus, pollution control, public water supply, stress tolerance, total nitrogen
In this study, the effects of nutrient and dissolved organic matter removal, stress resistance (DNA methylation), and the algae-bacteria dynamic ratio of algal-bacterial consortia in actual municipal wastewater were investigated. Results indicate that the presence of a Chlorella vulgaris-Bacillus licheniformis consortium had profound effects. The removal rates of total nitrogen, ammonium, orthophosphate phosphorus and chemical oxygen demand were 88.82%, 84.98%, 84.87% and 82.25%, respectively. Protein-like substances, which are difficult to degrade in the natural water environment, were significantly degraded in actual municipal wastewater. Furthermore, the microbial diversity was measured. The algal-bacterial consortium did not disrupt the microbial in-situ diversity of the actual municipal wastewater under suitable conditions. The global nuclear DNA methylation level peaked at 7.80%. These results help to understand the effects of algal-bacterial consortia on nutrient and pollutant removal and adaptability in actual municipal wastewater.