Extractability of heavy metals in saline and non-saline soils treated with municipal wastewater under two contrasting moisture regimes

Document Type : Research Paper

Authors

1 Bu-Ali Sina University, Hamadan, Iran

2 Bu-Ali Sina University, Hamadan, Iran,

3 ArakUniversity, Arak, Iran

Abstract

Solubility and bioavailability of heavy metals are important with respect to their
toxicity. The discharge of municipal wastewater in soil and surface waters can affect
bioavailability and mobility of heavy metals in soils and sediments. The effect of discharge
of Arak municipal wastewater on the KNO3 and DTPA extractable heavy metals in a saline
soil sampled from Mighan playa (Iran) compared to a non-saline agricultural soil was
studied in two moisture regimes (field capacity and flooding) in three incubation times (1,
150 and 365 day). In the saline soil, the addition of wastewater led to increase of organic
carbon (OC) and decrease of Eh, pH and EC. However, in the non-saline soil, the addition
of wastewater led to increase of EC and decrease of TOC and Eh simultaneously. With very
few exceptions, the addition of wastewater increased the KNO3 and DTPA extractable
heavy metals significantly. These changes were higher in the saline submerged soil. So, the
addition of municipal wastewater in soils for irrigation of saline and non-saline croplands
was safer than when it was applied in waterlogged soils. The changes of the analyzed
properties were higher in the saline soil compared to those in the non-saline soil. Hence, the
resilience of the saline soil compared to the non-saline soil due to its lower buffering
capacity was considerably lower. We can conclude that the release of wastewater to
Mighan playa soil with high level of salinity may increase the bioavailability and mobility
of heavy metals towards that lake.

Keywords

Main Subjects


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