Produção Nacional
Revisado por pares
A new biostimulation approach based on the concept of remaining P for soil bioremediation
2017; Elsevier BV; Volume: 207; Linguagem: Inglês
10.1016/j.jenvman.2017.11.061
ISSN1095-8630
AutoresAline Daniela Lopes Júlio, Rita de Cássia Rocha Fernandes, Maurício Dutra Costa, Júlio César Lima Neves, Edmo Montes Rodrigues, Marcos Rogério Tótola,
Tópico(s)Soil and Environmental Studies
ResumoC:N:P ratio is generally adopted to estimate the amount of nitrogen and phosphorus to be added to soils to accelerate biodegradation of organic contaminants. However, differences in P fixation among soils lead to varying amounts of available P when a specific dose of the element is applied to different soils. Thus, the application of fertilizers to achieve a previously established C:P ratio leads to biodegradation rates that can be lower than the theoretical maximum. In this study, we developed an equation to estimate the dose of P required to maximize organic contaminant biodegradation in soils as a function of remaining P (P-rem), using diesel as a model contaminant. The soils were contaminated with diesel and received six doses of P. CO2 emission was used to estimate biodegradation of hydrocarbons. Biodegradation increased with P doses. The P level that provided the highest hydrocarbon biodegradation rate showed linear and negative correlation with P-rem. The result shows that the requirement for P decreases as the P-rem of the soil increases (or the P-fixing capacity decreases). The dose of P recommended to maximize hydrocarbon biodegradation rate in soil can be estimated by the formula P (mg/dm3) = 436.5–5.39 × P-rem (mg/L).
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