Hossein Alidadi; Seyedeh Blin Tavakoli Sani; Batoul Zarif gharaati oftadeh; Mohammad Tafaghodi; Seyed Hossein Shams Zadeh; Maryam Fakhari; Ali Asghar Navaei Fezabady; Mohsen Yazdani
Abstract
Background and objectives: Corrosion and Scaling in distribution network pipes is one of the most important indices in water quality evaluation and one of the most common environmental phenomena that deteriorate water quality, color, odor, taste and also increases the concentration of heavy metals in ...
Read More
Background and objectives: Corrosion and Scaling in distribution network pipes is one of the most important indices in water quality evaluation and one of the most common environmental phenomena that deteriorate water quality, color, odor, taste and also increases the concentration of heavy metals in water. Corrosion causes entry of bye-products to water and decreases pipe life and sedimentation, reduces the flow rate and the efficiency of valves and fittings. The purpose of this study was to determine the corrosion or Scaling state of drinking water in Mashhad in 2017. Material and methods: In this study, 72 samples were taken during 2017 to evaluate water quality characteristics, and analyzed based on the standard methods. Then, three indices including Langlier, Ryznar and Aggressiveness Indices were programmed in Excel software and based on this, Corrosion and scaling potential of drinking water were determined. Results: Results showed that the averages of Langlier, Ryznar and Aggressiveness Indices for water were 0.14±0.48, 6.67±0.38 and 12.23±0.23, respectively. According to the Langlier and Ryznar indices, 86.1% of total samples had low scaling potential and according to Aggressive index 97.2% of total samples had scaling. Also, the results showed that 58.33% of the samples were low scaling in spring and other samples were high scaling. In addition, in the summer, 33.3% of the total samples were high scaling and other samples were low scaling. Conclusion: The results showed that drinking water of Mashhad city was Scaling. Therefore, it is necessary to take measures to control scaling in distribution network pipes, especially in areas located in high scaling zones.
Majid Mirzabeygi; amirhossein Mahvi; Mozhgan Naji; Abbas Abbasnia
Abstract
Background & Objective:One of the most complicated and costly problems associated with drinking water providing, is called as corrosion. Corrosion processes can cause pitting problems, reducing lifetime of water utilities and loss of water which can lead to high cost. Therefore the aim of this study ...
Read More
Background & Objective:One of the most complicated and costly problems associated with drinking water providing, is called as corrosion. Corrosion processes can cause pitting problems, reducing lifetime of water utilities and loss of water which can lead to high cost. Therefore the aim of this study is to determine the corrosion and scaling indices of rural drinking water resources of Khorasan Razavi. Material & Methods:In this cross sectional study to evaluate water quality characteristics in the Khorasan Razavi resources, 879 samples were taken during 2013 were analyzed based on standard manual method book. Five indices including Langlier, Ryznar, Puckorius, Larson-Skold and Aggressiveness Index were programed in Excel software then scaling potential and corrosiveness of rural water of Khorasan razavi was studied. Results: The results indicated that values of Langlier equals 0.33 ±0.14, Ryznar equals 7.36 ±0.37,Puckorius equals 7.4 ±0.6, Larson Ratio is equal to 2.1±1.4 and Aggressiveness Index equals 12.03 ±0.18. Conclusions: In comparison of five stability indices, it was found that drinking water in the study area is corrosive. Thus essential actions for reducing corrosion and corrosion by-products, health and economic loss are required.