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The effect of floating covers (balls without holes and holes) of evaporation control on the chemical and physical parameters of water quality (a case study of the Faculty of Agriculture and Natural Resources of Lorestan University)
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Sedighe Ebrahimiyan   , Naser Tahmasebi por , Mohsen Adeli , Hossein Zeinivand , Mohamad Tahmasebi por |
| , Lorestan University |
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Abstract: (71 Views) |
In the current research, with the aim of reducing the amount of evaporation with floating balls and investigating the changes in the chemical parameters of water quality and physical parameters (water temperature) in the period of 2 months from 1400/6/1 to 1400/7/30 in the meteorological research station. It was done in the campus of the Faculty of Natural Resources of Lorestan University. The obtained results showed that balls without holes with 70% efficiency had the greatest contribution in reducing evaporation, while balls with six holes with 30% efficiency were the next priority. Finally, balls without holes were identified as the best evaporation-reducing coating in the present study due to the appropriate roughness on the surface and the constant percentage of empty spaces over time.Selected quality parameters including percentage of dissolved oxygen (DO%), pH, electrical conductivity, calcium, magnesium, and total hardness were investigated. Examining changes in dissolved oxygen concentration as a parameter affecting other parameters. The obtained results show this that the values of the mentioned parameters in the control pan during the statistical period were 69% dissolved oxygen, total hardness 143.6 (ppm), electrical conductivity 682.4 (decimes), calcium 45.5 (ppm), magnesium 45.6 (ppm), and also the values of the aforementioned parameters in the pan with a six-hole ball, 59.75% of dissolved oxygen, total hardness 144 (ppm), electrical conductivity 2.581 decimens, magnesium 1.45 (ppm), calcium 45.2 (ppm).The statistical analysis of the mentioned results shows the amount of changes of each of the investigated elements during the statistical period in the order of dissolved oxygen, which among the quality elements of water has the most changes and the least changes related to the total hardness element. The obtained results show an 8% decrease in EC and pH up to 6% in the six-hole ball compared to the control pan. In addition, in the control pan, the possibility of contact with air, more incoming radiation and the occurrence of photosynthesis increase the concentration of dissolved oxygen. On the other hand, in the pan covered with a six-hole ball, the presence of floating covers reduces the amount of water mixing. These factors cause a 16% decrease in dissolved oxygen in water in a pan with a six-hole ball. The presence of coatings reduces the amount of biological activities, which increases the concentration of calcium and magnesium by 10 and 11%, respectively, in the six-hole ball pan compared to the control pan, the increase in magnesium and calcium leads to an increase in the hardness of the whole pan with the six-hole ball compared to the control pan. The control pan has increased by 7% compared to the control pan. Due to the material of the balls, which was made of polyethylene material, this material absorbed the heat of the sun and the increase in the roughness of the surface led to an increase in the water temperature. A 6% increase in the surface temperature of the pan with a six-hole ball compared to the control, which in the statistical analysis using Anova with averaging through Tukey and Duncan in SPSS, the temperature of the six-hole pan has a significant difference from the surface temperature of the control pan.
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Article number: 1 |
| Keywords: evaporation control, water quality, chemical parameter of quality, floating ball |
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Full-Text [PDF 1054 kb]
(59 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2024/01/1 | Accepted: 2025/06/7 | Published: 2025/06/21
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