Disposal of used geothermal waters in Hungary often means temporary storage in reservoir lakes to reduce temperature and improve water quality. In this study, the physical and chemical properties and changes in the bacterial community structure of a reservoir lake system in southeast region of Hungary were monitored and compared through 2 years, respectively. The values of biological oxygen demand, concentrations of ammonium ion, total inorganic nitrogen, total phosphorous, and total phenol decreased, whereas oxygen saturation, total organic nitrogen, pH, and conductivity increased during the storage period. Bacterial community structure of water and sediment samples was compared by denaturing gradient gel electrophoresis (DGGE) following the amplification of the 16S rRNA gene. According to the DGGE patterns, greater seasonal than spatial differences of bacterial communities were revealed in both water and sediment of the lakes. Representatives of the genera Arthrospira and Anabaenopsis (cyanobacteria) were identified as permanent and dominant members of the bacterial communities.

中文翻译：

---

湖泊系统中地热水的临时存储效率：监测水质和细菌群落结构的变化。

在匈牙利处置用过的地热水通常意味着将其暂时储存在水库湖泊中，以降低温度并改善水质。在这项研究中，对匈牙利东南部一个储集湖系统的理化特性和细菌群落结构的变化分别进行了监测和比较，历时两年。在储存期间，生物需氧量，铵离子浓度，总无机氮，总磷和总酚值降低，而氧饱和度，总有机氮，pH和电导率升高。在16S rRNA基因扩增后，通过变性梯度凝胶电泳（DGGE）比较了水和沉积物样品的细菌群落结构。根据DGGE模式，在湖泊的水和沉积物中，细菌群落的季节性差异大于空间差异。节肢动物和拟南芥属（蓝细菌）的代表被确定为细菌群落的永久成员和优势成员。