Department of Civil and Environmental Engineering, University of Toledo, Mail Stop 307, 3006 Nitschke Hall, Toledo, OH, 43606, United States of America.
SePRO Research and Technology Campus, 16013 Watson Seed Farm Rd., Whitakers, NC, 27891, United States of America.
J Environ Manage. 2024 Nov;370:122822. doi: 10.1016/j.jenvman.2024.122822. Epub 2024 Oct 15.
Increased occurrence of harmful algal blooms significantly impedes uses of freshwater resources, especially as potable water supply. Rapid mitigation using algaecides is common; however, the potential release of algal organic matter (AOM) and cyanotoxins poses challenges due to the difficulty of removal with conventional water treatment and negative health impacts. This study evaluated four USEPA-registered algaecides for their efficacy against Microcystis aeruginosa growth and AOM and cyanotoxin release. Successful inhibition of cell growth was achieved in both unialgal and mixed culture samples at concentrations of 0.2 mg Cu/L for copper-based algaecides and 6 mg HO/L for peroxide-based algaecides. At 12 h after treatment (HAT), a significant increase in dissolved phycocyanin was observed, which was more pronounced with copper-based algaecides. Microbial byproduct-related and simple aromatic proteins were measured in the unialgal culture, while microbial byproduct-related proteins and humic-like substances were dominant in the mixed culture samples. In both unialgal and mixed-culture experiments, 0.2 mg Cu/L application of copper-based algaecides was the minimum dosage for cyanobacterial cell inhibition and the lowest release of AOM and cyanotoxins, with Oximycin P5 at 6 mg HO/L yielding similar results among peroxide-based algaecides. These results help inform water supply managers on algaecide use toward maintaining integrity of drinking water quality.
有害藻类大量繁殖显著阻碍了淡水资源的利用，尤其是作为饮用水供应。使用杀藻剂进行快速缓解是常见的做法；然而，由于常规水处理难以去除藻类有机物质 (AOM) 和蓝藻毒素，以及其对健康的负面影响，因此存在挑战。本研究评估了四种美国环保署注册的杀藻剂对铜绿微囊藻生长和 AOM 及蓝藻毒素释放的效果。在浓度为 0.2mgCu/L 的铜基杀藻剂和 6mgHO/L 的过氧化物基杀藻剂下，无论是在单藻还是混合培养样品中，均能成功抑制细胞生长。处理后 12 小时（HAT），观察到溶解藻蓝蛋白显著增加，铜基杀藻剂更为明显。在单藻培养中测量了微生物副产物相关和简单芳香族蛋白质，而在混合培养样品中，微生物副产物相关蛋白质和腐殖质样物质占主导地位。在单藻和混合培养实验中，铜基杀藻剂的 0.2mgCu/L 施用量是抑制蓝藻细胞生长和 AOM 及蓝藻毒素释放的最低剂量，而过氧化物基杀藻剂中的 Oximycin P5 在 6mgHO/L 时也能达到类似的效果。这些结果有助于为供水管理人员提供有关杀藻剂使用的信息，以维护饮用水质量的完整性。
