Clogging of groundwater recharge basins by cyanobacterial mats
Clogging of groundwater recharge basins by cyanobacterial mats
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DOI：
10.1111/j.1574-6968.1989.tb03697.x
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发表时间：
1989-06
影响因子：
2.1
通讯作者：
R. Katznelson
中科院分区：
文献类型：
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作者：
R. Katznelson
在以色列Dan地区废水回收项目中，在地下水补给盆地的表面上生长的蓝细菌垫往往会降低污水渗入地下的速率。这项工作的目的是研究在盆地中发现的蓝藻种群，并阐明其对堵塞过程的贡献。分离出三种蓝藻，并在模拟系统中测定了它们的堵塞能力。模拟实验也被用来研究不同的驱油制度对席发展和渗透率的影响。在补给盆地，堵塞事件发生在秋季，冬季或春季。在这些季节，席藻秋季被发现是在垫的优势蓝藻类型之一。这种生物能够快速滑行，形成筏状结构，产生细胞外鞘，并分泌大量粘液。秋海棠显著的堵塞能力被认为与这些特征有关。另一种蓝藻，在夏季在垫中占主导地位，不表达这种组合的功能，其堵塞能力要低得多。补给池通常用污水淹没24小时，然后干燥48小时。在一个模拟实验中，当蓝藻垫不允许彻底干燥时，堵塞会增强。仅在夜间10小时的洪水，然后由38小时的干燥，使时间分离的光的可用性和水的可用性的补给制度的改变。在这种制度下，蓝藻垫的发展显着迟缓。它的结论是，夜间洪水可以缓解与蓝藻垫堵塞的补给盆地的操作问题。
Cyanobacterial mats, which develop on the surface of groundwater recharge basins in the Dan Region Wastewater Reclamation Project in Israel, tend to reduce the rate of effluent infiltration into the ground. The purpose of this work was to study the cyanobacterial populations found in the basins and to elucidate their contribution to the clogging process. Three cyanobacterial types were isolated and their clogging capacity was determined in a simulation system. Simulation experiments were also used to study the effects of various flooding regimes on mat development and permeability. In the recharge basins, clogging events have occurred in the autumn, winter or spring. During these seasons, Phormidium autumnale was found to be one of the dominant cyanobacterial types in the mat. This organism is capable of rapid gliding, forms raft-like structures, produces an extracellular sheath, and secretes copious amounts of mucus. The remarkable clogging capacity of P. autumnale is thought to be related to these features. Another cyanobacterium, which predominates in the mats during the summer, does not express this combination of features and its clogging capacity is much lower. The recharge basins are normally flooded with effluent for 24 h and dried for 48 h. In a simulation experiment clogging was enhanced when cyanobacterial mats were not allowed to dry thoroughly between floodings. Alteration of the recharge regime to 10 h of flooding during the night only, followed by 38 h of drying, enabled temporal separation of light availability and water availability. Under this regime the development of cyanobacterial mats was significantly retarded. It is concluded that night-flooding can alleviate the operational problems associated with clogging of the recharge basins by cyanobacterial mats.