Wu Xiaoge, Xu Guofeng, Wang Juanjuan
Environment Science and Engineering College, Yangzhou University Yangzhou Jiangsu 225009 China
Jiangsu Provincial Laboratory of Water Environmental Protection Engineering, School of Environmental Science and Engineering, Yangzhou University Yangzhou 225127 Jiangsu China.
RSC Adv. 2020 Apr 2;10(23):13525-13531. doi: 10.1039/d0ra01530j. eCollection 2020 Apr 1.
Harmful cyanobacterial blooms are increasing environmental issues and require novel removal technology since the required doses of algaecides may cause further environmental pollution or treatment facility damage. Herein, we firstly introduce the combination of ultrasound and FeO/CNTs as an alternative strategy to enhance coagulation for the removal of cells in water. It remarkably enhanced cyanobacterial cell removal and microcystins control, compared with sonication alone (40 kHz ultrasonic bath, 4.2 mJ mL). 94.4% cyanobacterial cells were removed using 20 second sonication with 20 mg L FeO/CNTs, Al(SO) coagulation (20 μM). Both sonication time and catalyst dose significantly influenced the cyanobacterial removal. Ultrasound with FeO/CNTs only induced a slight increase of cell permeability, which may contribute to the effective control of DOC and microcystins' release in water. The enhanced settlement of the cyanobacterial cells may result from the moderate oxidation on the cell surface. This study suggested a novel ultrasound-FeO/CNT process to promote cyanobacteria removal with efficient DOC and microcystin release control, which is a green and safe technology for drinking water treatment.
有害蓝藻水华正日益成为环境问题，由于所需剂量的除藻剂可能会导致进一步的环境污染或处理设施损坏，因此需要新的去除技术。在此，我们首次介绍了超声与FeO/碳纳米管的组合，作为一种增强混凝以去除水中蓝藻细胞的替代策略。与单独超声处理（40 kHz超声浴，4.2 mJ/mL）相比，它显著提高了蓝藻细胞的去除率和微囊藻毒素的控制效果。使用20 mg/L FeO/碳纳米管、Al(SO)混凝（20 μM）进行20秒超声处理，可去除94.4%的蓝藻细胞。超声处理时间和催化剂剂量均显著影响蓝藻的去除效果。FeO/碳纳米管与超声联用仅引起细胞通透性略有增加，这可能有助于有效控制水中溶解性有机碳（DOC）和微囊藻毒素的释放。蓝藻细胞沉降的增强可能是由于细胞表面的适度氧化。本研究提出了一种新型的超声-FeO/碳纳米管工艺，以促进蓝藻的去除，并有效控制DOC和微囊藻毒素的释放，这是一种用于饮用水处理的绿色安全技术。
