Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China.
Chemosphere. 2013 Aug;92(10):1383-9. doi: 10.1016/j.chemosphere.2013.05.014. Epub 2013 Jun 14.
To achieve better removal of NH4(+) and TP in wastewater, a new algae-bacteria combined system of Chlorella vulgaris and Bacillus licheniformis was investigated in a 6-d experiment. The results showed that 78% of NH4(+) could be removed in the combined system, while 29% in single algae system and only 1% in single bacteria system. Approximately 92% of TP was removed in the combined system, compared with 55% and 78% in single algae and bacteria system, respectively. B. licheniformis was proven to be a growth-promoting bacterium for C. vulgaris by comparing Chl a concentrations in the single and combined systems. In the removal process, pH of the combined system was observed to reduce significantly from 7.0 to 3.5. Whereas with pH regulated to 7.0, higher removal efficiencies of NH4(+) (86%) and TP (93%) were achieved along with the recovery of algal cells and the increase of Chl a. These results suggest that nutrients in wastewater can be removed efficiently by the algae-bacteria combined system and pH control is crucial in the process.
为了更好地去除废水中的 NH4(+) 和 TP，在一个为期 6 天的实验中，研究了小球藻和地衣芽孢杆菌组成的新型藻菌联合系统。结果表明，联合系统中 78%的 NH4(+)被去除，而单一藻类系统中只有 29%，单一细菌系统中只有 1%。与单一藻类和细菌系统相比，联合系统中约 92%的 TP 被去除，分别为 55%和 78%。通过比较单一和联合系统中 Chl a 的浓度，证明地衣芽孢杆菌是小球藻的促生长菌。在去除过程中，观察到联合系统的 pH 值从 7.0 显著降低至 3.5。而当 pH 值调节至 7.0 时，NH4(+)（86%）和 TP（93%）的去除效率更高，同时藻类细胞得到恢复，Chl a 增加。这些结果表明，废水中的营养物质可以被藻菌联合系统有效去除，并且 pH 值控制在该过程中至关重要。
