ABSTRACT
Soil contamination has been a major concern in many regions of the world. Rampant generation of solid waste and its inadequate disposal has aggravated the risk of soil contamination. The objective of this article was to treat and refunctionalize soil contaminated by leachate from the landfill of Altinho, Pernambuco. Soil decontamination was carried out using the Fenton and photo-Fenton processes with black light and sunlight, evaluating the percentage of total organic carbon conversion. After the treatment with the photo-Fenton solar, the soil was very acidic, with small concentrations of inorganic ions, high saturation by aluminum and low degree of base saturation, revealing an infertile soil. For soil refunctioning, sewage sludge was added in the proportions of 10, 30 and 50% in relation to the post-treated soil mass and validated by planting Coriandrum Sativum L., obtaining better results for root growth, total length of plant, amount of leaves and mass of plants for the treatment with 30% sewage sludge insertion. This treatment had a percentage of root inhibition of 13.2% and did not present a risk of toxicity to the Lactuca Sativa L. species. It was also possible to observe an increase in the cation exchange capacity, base saturation index, nitrogen and phosphorus levels, in addition to the reduction in aluminum saturation, showing an improvement in the agronomic conditions of the soil.
Keywords:
soil; contamination; landfill; advanced oxidative process; fertility
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