Chemosphere ( IF 8.8 ) Pub Date : 2021-02-20 , DOI: 10.1016/j.chemosphere.2021.130017 Qixuan Song , Suzhen Huang , Li Xu , Qi Li , Xingzhang Luo , Zheng Zheng
Magnetite/lanthanum hydroxide composite (MLC-10) was applied in simulate natural water, sediment and cyanobacteria (WSC) system to evaluate its effect on cyanobacterial bloom in this study. According to the results, the addition of MLC-10 showed a good performance on inhibition of cyanobacterial bloom in systems. The cyanobacteria density of WSC-0.5 and WSC-1.0 (adding 0.5 g and 1.0 g MLC-10) at 30 day was 99.39% and 99.84% less than that in WSC-C (adding no MLC-10 in WSC system), respectively. The addition of MLC-10 could form a phosphorus-binding layer that adsorbed soluble reactive phosphate (SRP) in overlying water, improved the release of internal phosphorus (P) from sediment to pore water then blocked SRP release from pore water to overlying water, especially in WSC-0.5 and WSC-1.0. The results may be due to the high adsorption capacity of MLC-10 to phosphorus. Additionally, oxidative stress and oxidative damage of cyanobacteria were observed after exposing to MLC-10, and oxidative damage degree increased with the elevated amount of MLC-10. MLC-10 addition showed a slight effect on microbial community of surface sediment. Phosphorus limitation, cell damage and limited cells’ floating performance were the possible mechanisms of cyanobacterial bloom controlling by MLC-10. Based on these results, MLC-10 could be used as a potential P-inactive material for cyanobacterial bloom controlling.
中文翻译:
磁铁矿/氢氧化镧复合物对蓝藻水华的响应
磁铁矿/氢氧化镧复合材料(MLC-10)被用于模拟天然水,沉积物和蓝细菌(WSC)系统中,以评估其对蓝细菌水华的影响。根据结果,MLC-10的添加显示出良好的抑制系统中蓝藻水华的性能。在30天时,WSC-0.5和WSC-1.0(添加0.5 g和1.0 g MLC-10)的蓝细菌密度分别比WSC-C(在WSC系统中不添加MLC-10)的蓝细菌密度分别低99.39%和99.84%。 。添加MLC-10可以形成磷结合层,该磷结合层在上层水中吸附可溶性反应性磷酸盐(SRP),改善了内部磷(P)从沉积物向孔隙水的释放,然后阻止了SRP从孔隙水向上层水的释放,特别是在WSC-0.5和WSC-1.0中。结果可能是由于MLC-10对磷的高吸附能力。另外,暴露于MLC-10后,观察到蓝细菌的氧化应激和氧化损伤,并且氧化损伤程度随MLC-10含量的增加而增加。MLC-10的添加对表面沉积物的微生物群落有轻微的影响。磷的限制,细胞的损伤和有限的细胞的漂浮性能是MLC-10控制蓝藻水华的可能机制。基于这些结果,MLC-10可用作潜在的P惰性材料,用于控制蓝藻水华。MLC-10的添加对表面沉积物的微生物群落有轻微的影响。磷的限制,细胞的损伤和有限的细胞的漂浮性能是MLC-10控制蓝藻水华的可能机制。基于这些结果,MLC-10可用作潜在的P惰性材料,用于控制蓝藻水华。MLC-10的添加对表面沉积物的微生物群落有轻微的影响。磷的限制,细胞的损伤和有限的细胞的漂浮性能是MLC-10控制蓝藻水华的可能机制。基于这些结果,MLC-10可用作潜在的P惰性材料,用于控制蓝藻水华。