Duan Yun, Guo Xin, Yang Jingjing, Zhang Mingmei, Li Yangyang
College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, People's Republic of China.
R Soc Open Sci. 2020 Jan 22;7(1):191214. doi: 10.1098/rsos.191214. eCollection 2020 Jan.
This study illustrated the growth of and recycle of nutrients in wastewater combined with inorganic carbon under autotrophic conditions. was cultivated under different conditions by adding sodium carbonate (NaCO) at 15-40 mg l separately in wastewater containing high nitrogen and phosphorus content. The growth characteristics of , pH and dissolved inorganic carbon (DIC) changes of microalgae liquid, the recycle rate of ammonia and phosphorus and lipid content were determined. The changes of pH and DIC showed that could use NaCO to grow, with lipid contents of 18-25%. Among all NaCO concentrations, 20 mg l was the optimum, of which had the highest NH-N recycle of 52% and recycle of 67%. By the 14th day, its biomass production also reaches the maximum of 0.21 g l. However, inorganic carbon fixation rate was inversely proportional to its concentration. Moreover, the biomass was in positive correlation with the NaCO concentration except 20 mg l, which provided a possibility that could be acclimatized to adjust to high concentrations of inorganic carbon to promote biomass accumulation and recycle of nutrients.
本研究阐述了在自养条件下，废水与无机碳结合时营养物质的生长和循环情况。通过在高氮磷含量的废水中分别添加15 - 40 mg/L的碳酸钠（Na₂CO₃），在不同条件下培养微藻。测定了微藻的生长特性、微藻液的pH值和溶解无机碳（DIC）变化、氨和磷的循环率以及脂质含量。pH值和DIC的变化表明微藻可以利用Na₂CO₃生长，脂质含量为18 - 25%。在所有Na₂CO₃浓度中，20 mg/L为最佳浓度，此时微藻对NH₃-N的循环率最高，为52%，对PO₄³⁻的循环率为67%。到第14天，其生物量产量也达到最大值0.21 g/L。然而，无机碳固定率与其浓度成反比。此外，除20 mg/L外，生物量与Na₂CO₃浓度呈正相关，这为微藻适应高浓度无机碳以促进生物量积累和营养物质循环提供了可能性。
