Remediation study for a salt-affected soil impacted by the oil and gas industry.

摘要

An agricultural land was adversely affected by salt released by the oil and gas industry. Remediation was needed to recover the land to agricultural productivity. Field-scale and laboratory-scale experiments were conducted to identify a practical and reliable remediation technique that could be used to treat the salt-contaminated farmland. Different approaches, including leaching and drainage interventions, gypsum application, zeolite application, alluing or ripping, sanding and combinations of these approaches, were tested to evaluate the removal of sodium and chloride from salt-affected soils. Electrical conductivity (EC), sodium adsorption ratio (SAR) and remediation time were three important diagnostic parameters in the evaluation. It was found that the integrated application of alluing, gypsum addition and leaching achieved the best remediation for the fine textured soil containing a high concentration of sodium and chloride. Chemical amendments must be applied prior to leaching when treating severely sodic soils.