Frequent cyanobacterial blooms in reservoirs used for human supply increase the risk of noxious secondary metabolites, endangering human health and ecological balance, and requiring constant monitoring by water companies. Although hydrogen peroxide (H₂O₂) has been widely reported as an effective agent for the control of cyanobacteria, being Microcystis aeruginosa one of the most studied species, very limited data is available on its effects over Dolichospermum circinale. Therefore, this study aimed to evaluate the impact of H₂O₂ on D. circinale and comparing it to the effects over the M. aeruginosa. The treatment was performed in cyanobacterial cultures with the application of 2 and 5 mg L⁻¹ of H₂O₂ under visible light. To measure the impact of the treatment, intact cells were counted and cell re-growth monitored. Geosmin and microcystin, cell pigments, color, and organic matter in water were also analyzed during the treatment. The results showed that even the smallest H₂O₂ concentration (2 mg L⁻¹) was able to completely remove D. circinale cells. Although M. aeruginosa could only be completely removed using 5 mg L⁻¹, the few cells remaining after the application of 2 mg L⁻¹ were not viable and did not re-grew after 15 days. Total microcystin concentration increased after M. aeruginosa was exposed to H₂O₂, suggesting that oxidative stress may increase the detection of this metabolite when the cells are lysed. While 2 mg L⁻¹ was able to significantly decrease total geosmin, the addition of 5 mg L⁻¹ did not improve removal. Chlorophyll-a was readily degraded after cell rupture but the same did not happen to phycocyanin, demonstrating its high resilience to this oxidant. Color and organic matter increased for the M. aeruginosa but decreased for the D. circinale suspension, probably because the higher concentration of the M. aeruginosa yielded more extracellular content to the water which was not able to be degraded by the amount of H₂O₂ applied.

用于人类供水的水库中频繁的蓝藻水华增加了有毒次生代谢物的风险，危及人类健康和生态平衡，需要自来水公司持续监测。尽管过氧化氢 (H ₂ O ₂ ) 已被广泛报道为控制蓝藻的有效药剂，铜绿微囊藻是研究最多的物种之一，但关于其对圆白藻的影响的数据非常有限。因此，本研究旨在评估H ₂ O ₂对D. circinale的影响，并将其与对M. aeruginosa 的影响进行比较。在可见光下应用2mg L -1 和5mg L ^-1的H ₂ O ₂在蓝藻培养物中进行处理。为了测量治疗的效果，对完整细胞进行了计数并监测了细胞的再生长。处理过程中还对水中的土臭素和微囊藻毒素、细胞色素、颜色和有机物进行了分析。结果表明，即使是最小的H ₂ O ₂浓度（2 mg L ^-1 ）也能够完全去除D. circinale细胞。虽然仅使用5 mg L ^-1才能完全去除铜绿假单胞菌，但施用2 mg L ^-1后剩余的少数细胞无法存活，并且在15天后没有重新生长。铜绿微囊藻毒素暴露于 H ₂ O ₂后，总微囊藻毒素浓度增加，表明细胞裂解时氧化应激可能会增加这种代谢物的检测。 虽然2 mg L ^-1能够显着降低总土臭味素，但添加5 mg L ^-1并不能改善去除效果。叶绿素-a在细胞破裂后很容易被降解，但藻蓝蛋白却没有发生同样的情况，这表明它对这种氧化剂有很强的抵抗力。 M. aeruginosa的颜色和有机物增加，但D. circinale悬浮液的颜色和有机物减少，可能是因为较高浓度的M. aeruginosa向水中产生了更多的细胞外含量，而这些细胞外含量无法被 H ₂ O 的量降解₂已申请。