Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China; Australian Centre for Water and Environmental Biotechnology, the University of Queensland, Brisbane 4072, Australia.
Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China; Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China.
Bioresour Technol. 2022 Jul;356:127298. doi: 10.1016/j.biortech.2022.127298. Epub 2022 May 13.
Immobilized microalgae are good for wastewater treatment and biomass production. This study investigated treatment efficiency of a continuously operated system employing immobilized microalgae for secondary effluent of wastewater treatment plants, as well as the effectiveness on induction of valuable products, harvesting and dewatering of microalgae biomass. Under semi-continuous operation condition, microalgal dry weight increased 4.75 times within 2 d, associated with the highest removal rate of ammonia and phosphate at 28.95 mg/L·d and 4.83 mg/L·d, respectively. An immobilized microalgae membrane bioreactor (iMBR) was continuously operated for a month. The harvested immobilized microalgae beads were transferred to induction stage to obtain 4.5 times increase of lipid content per cell within 2 d. Immobilized microalgae performed 1.9 cm/s settling velocity and 97% water removal efficiency around 40 °C. A prospective integrated process on resource recovery and carbon neutrality was proposed for wastewater treatment, induction, harvesting and dewatering of immobilized microalgae cells.
固定化微藻有利于废水处理和生物质生产。本研究调查了连续运行系统对污水处理厂二级出水的处理效率，以及对诱导有价值产品、微藻生物质收获和脱水的有效性。在半连续操作条件下，微藻干重在 2 天内增加了 4.75 倍，氨和磷酸盐的去除率分别高达 28.95mg/L·d 和 4.83mg/L·d。固定化微藻膜生物反应器（iMBR）连续运行一个月。收获的固定化微藻珠被转移到诱导阶段，在 2 天内使每个细胞的脂质含量增加了 4.5 倍。固定化微藻的沉淀速度为 1.9cm/s，在 40°C 左右的水去除效率为 97%。提出了一种用于废水处理、诱导、收获和固定化微藻细胞脱水的资源回收和碳中和的综合工艺。
