Investigating the effects of using hexadecanol fatty alcohol in reducing evaporation from designed ponds in the environment of the Faculty of Natural Resources, Lorestan University

Subject Areas : Article frome a thesis

Sedighe Ebrahimian ¹ , Naser Tahmasebipour ^{2 *} , Mohsen Adeli ³ , Hossein Zeinivand ⁴ , Mohamad Tahmasebipour ⁵

1 - Ph.D. Student in Watershed Management, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran
2 - Associate Professor, Department of Watershed Management, Lorestan University, Khorramabad, Iran
3 - Professor, Department of Watershed Management, Lorestan University, Khorramabad, Iran
4 - Professor, Department of Organic Chemistry, Faculty of Basic Sciences
5 - Associate Professor, Faculty of Modern Sciences and Technologies, University of Tehran, Iran

Received: 2023-02-24 Accepted : 2024-09-12 Published : 2025-05-05

Keywords: Evaporation control, Water quality, Monolayer, Evaporation pond, Hexadecanol,

Abstract :

Introduction: In arid regions, rainfall shortage and evaporation from reservoir surfaces are among the issues that exacerbate the water scarcity problem in the country. One of the methods for combating and controlling this shortage is to reduce evaporation from reservoirs behind dams.

Methods: In this study, as chemical methods, a mixture of octadecane and hexadecane dissolved in ethanol was used. which were sprayed on the surface of the class A evaporation pond every three days. By spraying this powder on small reservoirs prepared to dimensions of    cubic meters at the Water and Meteorology Research Station, the quantitative (amount of evaporation reduction) and qualitative (possible changes on some chemical, physical parameters) effects have been investigated and the results are presented. Quantitative and qualitative results are compared over a two-month period between two control and control samples.

Findings: The results obtained show a 4% and 2% increase in BOD and COD in the pond with a monolayer of hexadecanol compared to the control pond. In addition, in the control pond, the possibility of contact with air, more incoming radiation and the occurrence of photosynthesis increase the concentration of dissolved oxygen. In contrast, in the pond covered with a monolayer of hexadecanol, the presence of floating coatings reduces the amount of water mixing. These factors cause an 8% decrease in dissolved oxygen in the pond with hexadecanol.

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