Ali Azari; Saeed Nazemi; Babak Kakavandi; Ayyob Rastegar
Volume 22, Issue 6 , January and February 2016, , Pages 944-954
Abstract
Background: Corrosion and scaling are the main problems that water facilities still face with them. Corrosion can caused great financial losses and health damage to the system, and consumers. Blockages and pressure drop in the network are another disadvantage of scaling. The aim of present study was ...
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Background: Corrosion and scaling are the main problems that water facilities still face with them. Corrosion can caused great financial losses and health damage to the system, and consumers. Blockages and pressure drop in the network are another disadvantage of scaling. The aim of present study was to determine the corrosive and scaling potential in drinking water resources of Shahrood city.
Materials and Methods: This crosses-sectional study was conducted over 4 seasons in 2013 years. 1104 samples were examined using Langelier (LSI), Rayznr (RSI), aggressive (AI) and Pokurious (PSI) indices to determine the corrosive and scaling potential in drinking water resources of Shahrood city. To compare the mean values of each indices, the results were analyzed using t-test.
Results: The results indicate that the drinking water resources of Shahrood according to the Langelier index equals -1.03 with a standard deviation of 0.11, according to Rayznr index equals 9.72 with a standard deviation of 0.17, based on Aggressive index equals 12.10 with a standard deviation of 0.14, based on Pokurious index equals 9.59 with a standard deviation of 0.13 respectively. The difference between the mean values of the four studied seasons also were significant. P-value< (0.05)
Conclusion: Comparison of four indices and obtained results showed that drinking water resources in Shahrood was corrosive, therefore, it is suggested that the city's water resources should constantly assessed and try adjusting the pH and control of other affecting factors on the corrosion such as chloride, dissolved oxygen and sulfate concentrations to reduce corrosion.
Ehsan Ahmadi; Ayyob Rastegar; Mehdi Farzadkia; Ali Azari
Volume 20, Issue 4 , January and February 2014, , Pages 530-538
Abstract
Background &Objective: According to the existing documents a major portion of municipal solid wastes in Iran is being land filled and small portion of this material is recycled, while the municipal waste management in developing countries has moved towards source separation and recycling .This research ...
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Background &Objective: According to the existing documents a major portion of municipal solid wastes in Iran is being land filled and small portion of this material is recycled, while the municipal waste management in developing countries has moved towards source separation and recycling .This research was conducted by the purpose of estimating Qom municipal solid waste recycling potential and cost benefit,s in a 20-year vision since 2006.
Materials & Methods: This Research is a cross-sectional study. Firstly, according to the reports given by waste management organization in Qom city, dry solid waste recycling in 2006 and 2011 was estimated. Then two scenarios consisted of 20 and 60 percents of recycling were estimated to process the solid waste in 2011 and 2028 for enhancing recycling level ,and then cost benefit of them was determined.
Results: The average of produced solid waste was 718 ton per day in Qom city in 2011. Due to this producing process in 1407 we will have 1145 ton solid waste per day in this city. Daily economic benefit of dry solid waste recycling in 2011 was 15801520 Rials. If the recycling programs promotes, this benefit can be increased to 63211640 and 189664400 Rials for 20 to 60%recycling level.
Conclusion: Despite of 21 % potential for dry solid waste recycling in Qom city, nowadays about 5% of this substances are recycling. By upgrading the plan for 10 to 20 years, amount of economic benefit can be increased to 4 to 12 times.