Document Type : Research Paper
In this study, raw and treated wastewater of Serkan Wastewater Treatment Plant, located at 70 km east of Hamedan, were reused for potato irrigation under lysimetric conditions. The factorial experiment executed with a statistical completely randomized design in three replicates and two factors. The factor of watering programs which were categorized as follows: 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). The factor of soil cores depths which were depths of 0-10 cm and 10-20 cm. The effects of watering treatments were significant on accumulation of Mn, Fe, Cu and Zn in the soil layers. Also the interaction effects were non-significant on accumulation of Mn, Cu and Zn. The interaction effect was significant on the Fe concentration. The maximum and minimum Mn, Fe, Cu and Zn concentration in the soil was obtained in T1 and T5, respectively. Also, the Mn, Fe and Zn concentration decrease with soil depth but concentration of Cu increase. Overall, based on the accumulation of heavy metal in the soil, the watering treatments were ranked as follows: T1> T3> T2> T4> T5. Based on the accumulation of heavy metal in the soil, heavy metals were ranked as follows: Fe> Mn> Zn> Cu.