جستجوی مقالات مرتبط با کلیدواژه "water scaling" در نشریات گروه "پزشکی"

This study investigated the corrosive and scaling potential of drinking water in the rural areas of eastern Kakhk, southern Khorasan Razavi, Iran. Corrosion and scaling are critical issues that lead to the deterioration of water distribution infrastructure and decreased water quality. The analysis was conducted using indices such as the Langelier Saturation Index (LSI), Ryznar Stability Index (RSI), Puckorius Scaling Index (PSI), Larson-Skold Index (LS), and the Aggressiveness Index (AI).

A total of 32 water samples were collected from 16 locations, including one city and 15 rural regions. Samples were drawn from springs, qanats, and distribution systems. Key physicochemical parameters such as pH, electrical conductivity, and concentrations of calcium and magnesium were measured. Each sample was analyzed twice in accordance with APHA standards, and corrosion and scaling indices were calculated.

The LSI revealed that 100% of the samples had a tendency to form scale, while the RSI indicated that 68.75% were corrosive. Over 80% of the samples were confirmed to be corrosive by the Larson-Skold and Aggressiveness indices. However, the Puckorius Index showed that 62.5% of the samples were in a balanced state, without a strong inclination towards either corrosion or scaling.

These results emphasize the need for continuous monitoring of water quality and the adoption of preventive measures to mitigate corrosion and scaling in rural water systems. The findings provide important insights for decision-makers to develop strategies aimed at preserving water infrastructure and ensuring long-term sustainability.

Corrosion and precipitation are important indicators of water quality assessment. The aim of this study was to analyze water stability water in Semnan distribution networks.

To achieve the purpose, samples were taken from 5 points (3 points of storage tanks and 2 distribution network points) and analyzed for physical-chemical analysis. The concentration of common anions and cations was determined by ion chromatography (IC). The sediment formed in the water distribution network was also investigated for studying its structure and main elements by using X-ray fluorescence spectroscopy (XRF) and induced coupling plasma spectroscopy (ICP). The corrosion and scaling indices, including the Ryznar stability index (RSI), Langelier index (LI), and calcium carbonate precipitation potential (CCPP) were also studied.

According to the obtained results, the quality (physically-chemically) of most of the taken samples lies within the permissible limits of Iran's national standard (1053). However, in terms of total harness all sampling point showed values beyond WHO guidelines for drinking water. Magnesium and sulfate concentrations were also exceeded in one of the reservoirs. The results also showed the main sediment structures were calcium carbonate (calcite) and silica oxide. Moreover, According to the results, the average values of LSI and CCPP represented the scaling due to carbonate calcium nature of water. Water stability analysis indicated major roles of calcium and magnesium bicarbonate formation as temporary hardness and minor roles of magnesium sulfate and chloride as permanent hardness.

According to the results, to prevent water scaling in pipes it is recommended to use lime softening at pH=10 which not only removes temporary hardness but enhances silicate ions removal by co-precipitation with Mg(OH)2 formed followed by filtration.