بررسي پتانسيل رسوب گذاري كربنات كلسيم در زهكشهاي كشاورزي (مطالعه موردي، استان خوزستان)

Evaluation of Potential Calcium Carbonate Precipitation in Agricultural Tile Drains

Physical or chemical clogging can obstruct a drain envelope and disable agricultural drainage systems. Chemical clogging can be formed by various substances. First step in recognizing clogging phenomena is to find out about precipitation materials. Calcium carbonate is a substance with low solubility that can be precipitated rapidly and makes the hard pan layer and obstruct the drain envelope. This study investigates the potential of calcium carbonate precipitation existing in agricultural drainage water in Khuzestan province. In this study three indicators such as Langelier, Ryznar and Stiff&Davis index were used to find out the potential of calcium carbonate precipitation in agricultural drainage water. Results showed that all of agricultural drainage systems in this study area have potential of calcium carbonate precipitation but the severity of precipitation potential is varied. In the meantime results also showed that the Stiff&Davis and Ryznar indexes in comparison with Langelier index have better estimation for determination of potential calcium carbonate precipitation.