Patterns of Water Quality Changes, Invasive Aquatic Plant Identification and Environmentally Friendly Control Solutions in Drinking Water Dams of Mazandaran Province
Subject Areas : Pollution of water resources
Pooyan MehrabanJoubani
1
*
,
hadi Modabberi
2
,
Seid Mohammad Mosavi
3
1 - Department of Basic Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
2 - عضو هیات علمی
3 - Rivers and Coastal Engineering Office, Mazandaran Water Region Company, Sari, Iran
Keywords: Drinking water dams, Biological quality, Invasive plants, Physicochemical parameters,
Abstract :
This study was investigated the patterns of water quality changes and the identification of invasive aquatic plant species in drinking water dams located in Mazandaran province, including Alborz, Shahid Rajaei and Meijran Dams. The best conditions of dissolved oxygen in Alborz, Shahid Rajaei and Meijran dams were around 10, 10 and 16 mg/L in April, respectively. Due to the thermal stratification created in August and September, the content of dissolved oxygen in all dams at a depth of 7 to 10 meters reached zero. Based on Carlson's index, these dams were eutrophic during these months. The highest amount of phosphate measured in July, August and September was observed in Meijran Dam. However, biological pollution of Alborz and Shahid Rajaei dams were higher than Meijran dam, the biological and chemical oxygen demand of Alborz and Shahid Rajaei dams were about 2 and 2.5 times higher than Meijran dam, respectively. Also, the amount of faecal coliform in Alborz dams was about 2 time compared Meijran dam. Despite the decrease in the amount of total coliform in three dams in September, the amount of faecal coliform in Alborz dam was about 3 times other dams. Two plants, hydrilla and Potamogeton, were observed as the invasive plants in Meijran dam, which seems that cormorant bird are the cause of invasive plants entering the dam.
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