School of Environmental Science and Engineering, Shandong University, 27 Shanda Nan Road, Jinan 250100, China.
School of Environmental Science and Engineering, Shandong University, 27 Shanda Nan Road, Jinan 250100, China; Shandong Provincial Engineering Centre on Environmental Science and Engineering, 17923 Jingshi Road, Jinan 250061, China.
Bioresour Technol. 2014 Aug;165:191-8. doi: 10.1016/j.biortech.2014.03.068. Epub 2014 Mar 26.
The effects of environmental factors on cyanobacteria damage and microcystin-LR degradation in drinking water sludge were investigated under anoxic conditions. The rates of microcystin-LR release and degradation increased rapidly with the increasing temperature from 15°C to 40°C and the highest degradation rate of 99% was observed at 35°C within 10days. Compared to acidic conditions, microcystin-LR degraded more rapidly in weak alkali environments. In addition, the microbial community structures under different anoxic conditions were studied. The sequencing results showed that four phyla obtained from the DGGE profiles were as follows: Proteobacteria, Acidobacteria, Firmicutes and Cyanobacteria. Proteobacteria containing nine genera were the most common species. Pseudomonas, Methylosinus and Sphingomona all showed stronger activities and had significant increase as microcystin-LR degraded, so they should be responsible for the microcystin-LR degradation. This is the first report of Pseudomonas, Methylosinus and Sphingomonas as the microcystins-degrading microorganisms in anoxic drinking water sludge.
在缺氧条件下研究了环境因素对饮用水污泥中蓝藻损伤和微囊藻毒素-LR 降解的影响。在 15°C 至 40°C 的温度范围内，随着温度的升高，微囊藻毒素-LR 的释放和降解速率迅速增加，在 10 天内最高降解率为 99%，在 35°C 下。与酸性条件相比，微囊藻毒素-LR 在弱碱性环境中降解得更快。此外，还研究了不同缺氧条件下的微生物群落结构。测序结果表明，从 DGGE 图谱中获得的四个门分别为：变形菌门、酸杆菌门、厚壁菌门和蓝藻门。含有九个属的变形菌是最常见的物种。假单胞菌、甲基单胞菌和鞘氨醇单胞菌的活性都很强，随着微囊藻毒素-LR 的降解而显著增加，因此它们应该负责微囊藻毒素-LR 的降解。这是首次报道假单胞菌、甲基单胞菌和鞘氨醇单胞菌为缺氧饮用水污泥中微囊藻毒素的降解微生物。
