Ebrahimzadeh Gholamreza, Alimohammadi Mahmood, Kahkah Mohammad Reza Rezaei, Mahvi Amir Hossein
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Department of Environmental health Engineering, Faculty of Health, Zabol University of Medical Sciences, Zabol, Iran.
J Environ Health Sci Eng. 2021 Jan 22;19(1):437-443. doi: 10.1007/s40201-021-00616-x. eCollection 2021 Jun.
Algae are known with many detrimental impacts on drinking water quality. Discharge of municipal and agricultural wastewater into the receiving water resources make desirable conditions for algae growth and consequently cause eutrophication phenomena. Water samples were withdrawn monthly from 5 stations in Zabol City within spring and summer seasons. To identify algae species, micronutrients, and physical parameters such as temperature, depth of Secchi disk (SD) and pH on their growth were evaluated. The average phosphate in spring and summer were observed to be 0.034 and 0.028 mg/L, respectively. The results obtained from the present study indicated that the volume and depth of the water reservoirs were less critical on total phosphorus compared with the concentration of algal cells and total nitrogen. The mean pH for water samples taken from Chah Niemeh (CN) in spring and summer were observed to be 8.4 which is suitable for algae growth. Furthermore, the mean temperature (>20 °C) in both seasons were found to be desirable for the growth of algae, especially cyanobacteria in the CN. Moreover, the mean SD in spring and summer samples was 96.16 m and 119.83 m, respectively. As a result, the reservoir had low transparency in terms of algal growth. Totally, most of the identified algae were green algae (50%), algal flagella (19%), cyanobacteria (15.4%) and diatoms (15%). Therefore, cyanobacteria are most possible responsible for the taste and odor in the CN water reservoir. Future efforts should be directed toward preventive measurements for protecting water reservoirs from municipal and agricultural wastewaters and algae control.
藻类对饮用水水质有许多不利影响。城市和农业废水排放到受纳水资源中为藻类生长创造了适宜条件，进而导致富营养化现象。在春季和夏季，每月从扎博勒市的5个站点采集水样。为了识别藻类物种，评估了微量营养素以及温度、塞氏盘深度（SD）和pH等物理参数对其生长的影响。春季和夏季的平均磷酸盐含量分别为0.034毫克/升和0.028毫克/升。本研究获得的结果表明，与藻类细胞浓度和总氮相比，水库的体积和深度对总磷的影响较小。春季和夏季从查赫尼迈（CN）采集的水样的平均pH值为8.4，适合藻类生长。此外，两个季节的平均温度（>20°C）都有利于藻类生长，尤其是CN中的蓝藻。而且，春季和夏季样品的平均SD分别为96.16米和119.83米。因此，就藻类生长而言，该水库透明度较低。总体而言，鉴定出的藻类大多为绿藻（50%）、藻类鞭毛虫（19%）、蓝藻（15.4%）和硅藻（15%）。因此，蓝藻最有可能是造成CN水库中味道和气味的原因。未来的努力应致力于采取预防措施，保护水库免受城市和农业废水的影响以及控制藻类。
