小球藻
异养
反硝化细菌
化学
生物量(生态学)
食品科学
磷
营养物
小球藻
氮气
反硝化
植物
生物
藻类
细菌
农学
有机化学
遗传学
作者
Tianxiang Lu,Kunyang Su,Guangxiang Ma,Jing Cong,Jie Liu,Qing Zhao,Mingming Song,Chongqing Xu,Xiaozhe Song
出处
期刊:Chemosphere
[Elsevier]
日期:2024-05-01
卷期号:: 142270-142270
标识
DOI:10.1016/j.chemosphere.2024.142270
摘要
To reduce the high cost of organic carbon sources in waste resource utilization in the cultivation of microalgae, volatile fatty acids (VFAs) derived from activated sludge were used as the sole carbon source to culture Chlorella sorokiniana under the heterotrophic cultivation. The addition of VFAs in the heterotrophic condition enhanced the total nitrogen (TN) and phosphorus (TP) removal of C.sorokiniana, which proved the advantageous microalgae in using VFAs in the heterotrophic culture after screening in the previous study. To discover the possible mechanism of nitrogen and phosphorus adsorption in heterotrophic conditions by microalgae, the effect of different ratios of VFAs (acetic acid (AA): propionic acid (PA): butyric acid (BA)) on the nutrient removal and growth properties of C. sorokiniana was studied. In the 8:1:1 group, the highest efficiency (77.19%) of VFAs assimilation, the highest biomass (0.80 g L-1) and lipid content (31.35%) were achieved, with the highest TN and TP removal efficiencies of 97.44 % and 91.02 %, respectively. Moreover, an aerobic denitrifying bacterium, Pseudomonas, was determined to be the dominant genus under this heterotrophic condition. This suggested that besides nitrate uptake and utilization by C. sorokiniana under the heterotrophy, the conduct of the denitrification process was also the main reason for obtaining high nitrogen removal efficiency.
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