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Paper Information

Journal:   TOLOO-E-BEHDASHT   APRIL-MAY 2016 , Volume 15 , Number 1 (55) ; Page(s) 102 To 109.


Author(s):  HAMZEIAN E.

Introduction: As odor of potable water seems to be unpleasant for the costumers in some regions, some researches need to be performed to find the odor reasons in the water sources in order to present engineering and management strategies to reduce it. Sasan spring, located near kazeroon city (Fars, Iran), is regarded as a potable water resource for Kazeroon and Booshehr city as well as other villages.
Water in Sasan spring has the odor problem. With regard to important role of algae in odor problems, the present study aimed to investigate the role of algae on unpleasant odor of Sasan spring in Kazeroon.
Methods: After regular sampling, the TON (threshold odor number) was determined, algae species were distinguished and the number of total algae was counted by microscopic direct numbering method. As the algae mass is related to nitrogen and phosphor concentration, results of nitrogen and phosphor concentrations in this spring, examined regularly by water company, were investigated and compared to the required concentration of these components for algae growing.
Results: The study results revealed that TONwas in range of 4.477 to 6.2 indicating oderous limit. Regression analysis demonstrated a linear relationship between TON and number of total algae.
The concentration of nitrogen and phosphor in the spring water confirmed an adequate condition for algal grow. Results of algae species determination showed a high population of Oscilatoria and Microcystis (Cyanobacteria group) species, known as elements of producing, which can cause soil odor in the water. Investigating geological maps in the region around the Sasan spring demonstrated that alluvium source is affected by the surrounding lands.
Conclusion: Since the algae is determined as the essential cause of odor in the spring, algal growth is related to its nutrients, and also the surface pollution can penetrate into the alluvium lands around the spring, management of nutrients as well as other pollutants containing nitrogen and phosphor are necessitated in order to control the algae and its odor in the spring.

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