Materials and Resources Research Group, Innovative Materials and Resources Research Center, Public Works Research Institute, 1-6 Minamihara, Tsukuba, Ibaraki 3058516, Japan.
Recycling Research Team, Materials and Resources Research Group, Public Works Research Institute, 1-6 Minamihara, Tsukuba, Ibaraki 3058516, Japan.
Bioresour Technol. 2016 May;207:399-408. doi: 10.1016/j.biortech.2016.01.132. Epub 2016 Feb 11.
Secondary effluent from wastewater treatment plants is suitable media for cultivating microalgae as a renewable energy source, and hydraulic retention time (HRT) control in culture is important to conduct well-planned outdoor indigenous microalgae cultivation with secondary effluent. This study revealed cultivation characteristics under various HRT by continuous 6-month experiments. In addition, effects of HRT on cultivation were determined by a mathematical model that described indigenous microalgae growth. Cultivated biomass mainly consisted of Chlorophyceae and its detritus regardless of HRT, and 5.93-14.8g/m(2)/day of biomass yield was obtained. The cultivated biomass had a stable higher heating value of 16kJ/g. Sensitivity analysis of the model suggests that HRT control had great effects on biomass yield, and 2-3days of HRT were recommended to obtain maximum biomass yield under certain weather conditions (temperature: approximately 12-25°C and solar radiation: approximately 8-19MJ/m(2)/day).
污水处理厂的二级出水是培养微藻作为可再生能源的合适介质，并且在文化中控制水力停留时间（HRT）对于进行计划良好的户外本地微藻培养与二级出水非常重要。本研究通过连续 6 个月的实验揭示了各种 HRT 下的培养特征。此外，通过描述本地微藻生长的数学模型确定了 HRT 对培养的影响。培养的生物质主要由绿藻及其碎屑组成，而与 HRT 无关，并且获得了 5.93-14.8g/m(2)/天的生物质产量。培养的生物质具有稳定的高位发热量为 16kJ/g。模型的敏感性分析表明，HRT 控制对生物质产量有很大的影响，并且在一定的天气条件下（温度：约 12-25°C，太阳辐射：约 8-19MJ/m(2)/天），建议使用 2-3 天的 HRT 以获得最大的生物质产量。
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