Zhang Tian-Yuan, Wu Yin-Hu, Hu Hong-Ying
Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China E-mail:
Water Sci Technol. 2014;69(12):2492-6. doi: 10.2166/wst.2014.160.
Cultivation of microalgae for biomass production is a promising way to dispose of wastewater and recover nutrients simultaneously. The properties of nutrient removal and biomass production in domestic wastewater of a newly isolated microalga Scenedesmus sp. ZTY1 were investigated in this study. Scenedesmus sp. ZTY1, which was isolated from a wastewater treatment plant in Beijing, grew well in both the primary and secondary effluents of a wastewater treatment plant during the 21-day cultivation, with a maximal algal density of 3.6 × 10(6) and 1.9 × 10(6) cells · mL(-1), respectively. The total phosphorus concentrations in both effluents could be efficiently removed by over 97% after the cultivation. A high removal rate (over 90%) of total nitrogen (TN) was also observed. After cultivation in primary effluent for 21 days, the lipid content of Scenedesmus sp. ZTY1 in dry weight had reached about 32.2%. The lipid and triacylglycerol (TAG) production of Scenedesmus sp. ZTY1 was increased significantly with the extension of cultivation time. The TAG production of Scenedesmus sp. ZTY1 increased from 32 mg L(-1) at 21 d to 148 mg L(-1) at 45 d in primary effluent. All the experiments were carried out in non-sterilized domestic wastewater and Scenedesmus sp. ZTY1 showed good adaptability to the domestic wastewater environment.
培养微藻用于生物质生产是一种同时处理废水和回收养分的有前途的方法。本研究调查了新分离的微藻斜生栅藻ZTY1在生活污水中的养分去除特性和生物质生产情况。从北京某污水处理厂分离得到的斜生栅藻ZTY1，在污水处理厂的一级和二级出水进行21天培养期间生长良好，最大藻密度分别为3.6×10⁶和1.9×10⁶个细胞·mL⁻¹。培养后，两种出水的总磷浓度均可有效去除97%以上。总氮（TN）的去除率也很高（超过90%）。在一级出水中培养21天后，斜生栅藻ZTY1的干重脂质含量达到约32.2%。随着培养时间的延长，斜生栅藻ZTY1的脂质和三酰甘油（TAG）产量显著增加。在一级出水中，斜生栅藻ZTY1的TAG产量从21天时的32 mg L⁻¹增加到45天时的148 mg L⁻¹。所有实验均在未灭菌的生活污水中进行，斜生栅藻ZTY1对生活污水环境表现出良好的适应性。
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