Application of Hydrogen Peroxide for the Removal of Toxic Cyanobacteria and Other Phytoplankton from Wastewater
Application of Hydrogen Peroxide for the Removal of Toxic Cyanobacteria and Other Phytoplankton from Wastewater
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DOI：
10.1021/es801717y
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发表时间：
2008-12-01
影响因子：
11.4
通讯作者：
Ghadouani, Anas
中科院分区：
文献类型：
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作者：
Barrington, Dani J.;Ghadouani, Anas
在污水处理厂中，含有高水平蓝藻的浮游植物水华很常见。铜绿微囊藻（Microcystis aeruginosa）是最常见的淡水蓝藻，其产生的肝毒素微囊藻毒素对人类和环境健康构成威胁。水华还影响水处理和再利用的可行性，并在碎屑积聚在管道和泵送基础设施中时造成问题。我们提出了应用过氧化氢（H2 O2）诱导蓝藻细胞死亡。光谱指纹的浮游植物分为四组（蓝藻，绿藻，硅藻，和隐藻）允许确定相当于叶绿素-a（chl-a）浓度贡献的光合色素，每个浮游植物组的光合活性的指示性措施。这是用来建立H2 O2除了对浮游植物在废水样品中的效果。造成浮游植物群体统计学上显著指数衰减的最低H2 O2剂量约为3.0 × 10（-3）g H2 O2/mug浮游植物chl-a。在此剂量下，蓝细菌和浮游植物总量的半衰期分别为2.3和4.5小时。蓝藻腐烂的速度约为两倍的绿藻和硅藻，和所有的浮游植物组的组合叶绿素a下降到可以忽略不计的水平内48小时的H2 O2应用。
Phytoplankton blooms containing elevated levels of cyanobacteria are common in wastewater treatment plants. Microcystis aeruginosa, the most common freshwater cyanobacterial species, produces the hepatotoxin microcystin, which is a threat to human and environmental health. Blooms also affect the viability of treating and reusing water and cause problems when detritus accumulates in pipe and pumping delivery infrastructure. We proposed the application of hydrogen peroxide (H2O2) to induce cyanobacterial cell death. Spectral fingerprinting of phytoplankton into four groups (cyanobacteria, chlorophyta, diatoms, and cryptophyta) allowed for determination of equivalent chlorophyll-a (chl-a) concentrations contributed by photosynthetic pigments, an indicative measure of the photosynthetic activity of each phytoplankton group. This was used to establish the effect of H2O2 addition on phytoplankton in wastewater samples. The lowest H2O2 dose that caused statistically significant exponential decay of phytoplankton groups was approximately 3.0 x 10(-3) g H2O2/mu g phytoplankton chl-a. At this dose, cyanobacteria and total phytoplankton exhibited a half-life of 2.3 and 4.5 h, respectively. Cyanobacteria decayed at a rate approximately twice that of chlorophyta and diatoms, and the combined chl-a of all phytoplankton groups decreased to negligible levels within 48 h of H2O2 application.