تأثیر زمان نگهداری هیدرولیکی بر کشت بیولوژیکی بومی به عنوان یک منبع انرژی تجدید پذیر با استفاده از پساب ثانویه

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 5.93–14.8 g/m2/day of biomass yield was obtained. The cultivated biomass had a stable higher heating value of 16 kJ/g. Sensitivity analysis of the model suggests that HRT control had great effects on biomass yield, and 2–3 days of HRT were recommended to obtain maximum biomass yield under certain weather conditions (temperature: approximately 12–25 °C and solar radiation: approximately 8–19 MJ/m2/day).