Nasrdin Parsafar; Safar Maroofi
Abstract
In this study, raw and treated wastewater from the Serkan Wastewater Treatment Plant was reused for potato irrigation under lysimetric conditions. The lysimeters were irrigated systematically each week during a period of five months before sowing operations. Experiment was run within greenhouse during ...
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In this study, raw and treated wastewater from the Serkan Wastewater Treatment Plant was reused for potato irrigation under lysimetric conditions. The lysimeters were irrigated systematically each week during a period of five months before sowing operations. Experiment was run within greenhouse during a period of four months. The experiment was factorial with a completely randomized design in three replicates and two variables: irrigation and soil depth. Irrigation treatments included: raw wastewater (T1), treated wastewater (T2), a combination of 50% raw wastewater and 50% fresh water (T3), a combination of 50% treated wastewater and 50% fresh water (T4), and fresh water (T5) as the control. The soil cores depths studied were 0-10 and 10-20 cm. After harvesting the crop, soil samples of each lysimeter was sampled in order to analyze for cadmium (Cd), nickel (Ni), and lead (Pb) concentration in 0-10 cm and 10-20 cm depths. The results showed that the effects of irrigation treatments were significant on accumulation of Cd, Pb, and Ni in the soil depths. However, the interaction effects were insignificant on accumulation of the heavy metals. According to the results, the maximum and minimum accumulation of Cd, Pb, and Ni in the soil was obtained in T1 and T5, respectively. Overall, based on the accumulation of heavy metals in the soil, the irrigation treatments were ranked as follows: T1> T3> T2> T4> T5. Also, results showed that Cd, Pb, and Ni concentration decreased with soil depth. Based on the accumulation in the soil, the studied heavy metals were ranked as follows: Pb> Ni> Cd.
Mohammad Modares; Mohammadreza Rezaee; Mohammad Naseri
Abstract
Kashaf Rood River, which passes through Mashhad city, is a seasonal river constantly attacked by all kinds of municipal, industrial, and agricultural wastes. In this research, 5 stations were selected along the river and water was sampled for analysis in spring 2012. Some crops and their soil were ...
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Kashaf Rood River, which passes through Mashhad city, is a seasonal river constantly attacked by all kinds of municipal, industrial, and agricultural wastes. In this research, 5 stations were selected along the river and water was sampled for analysis in spring 2012. Some crops and their soil were also sampled for measurement of heavy metals. Mean of the concentration of each heavy metal was compared in water samples with its maximum permissible amount for drinking, irrigation, and aquatic life, using Student’s t-test (in confidence level of %95). Results showed that there was significant difference between concentration of Pb and Cr in water of the river and the maximum permissible amount for drinking, irrigation, and aquatic life.. The amount of Hg was obtained to be higher than the maximum permissible amount for drinking in all stations, except for station 2 (Parkand Abad). Amount of Cr in wheat seed and corn leaf was much lower than the permissible limit. No significant correlation between concentration of Pb in soil, wheat seed, and leaf of corn was obtained at confidence level of %95 ( P>0.05), while significant correlation between concentration of Cr in soil, wheat seed, and corn leaf was obtained at confidence level of %95 ( P>0.05). There was no significant (P>0.05) correlation between concentration of Hg in soil, wheat seed, and corn leaf.