Removal of methyl parathion by surfactant-assisted soil washing and subsequent wastewater biological treatment

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  • Torres Luis G.
    Depto. De Bioprocesos, Unidad Profesional Interdisciplinaria de Biotecnologia-IPN, Av. Acueducto s.n. Col. Barrio la Laguna Ticoman
  • Ramos Fany
    Depto. De Bioprocesos, Unidad Profesional Interdisciplinaria de Biotecnologia-IPN, Av. Acueducto s.n. Col. Barrio la Laguna Ticoman
  • Avila Marco A.
    Depto. De Bioprocesos, Unidad Profesional Interdisciplinaria de Biotecnologia-IPN, Av. Acueducto s.n. Col. Barrio la Laguna Ticoman
  • Ortiz Irmene
    Universidad Autonoma Metropolitana-Cuajimalpa, Depto. Procesos y Tecnología, Artificios 40, Col. Hidalgo, Delegación Álvaro Obregón

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説明

The aim of this work is to present an integrated process for the remediation of soils contaminated with o,o-dimethyl o-(p-nitrophenyl)phosphorothioate, known as methyl parathion (MP), by surfactant-enhanced soil washing and treatment of the produced wastewaters in an aerobic-submerged biofilter. Soils containing approximately 0.4 and 13 mg/kg of MP were washed using anionic, nonionic, zwitterionic, and natural surfactants. Between 63 and 98% of the initial concentrations of MP were removed. Wastewater produced from soil washing with the addition of a natural biosurfactant, locust bean gum [0.01% (w/w)], was used for the experiments in an aerobic-submerged biofilter in which MP concentration decreased from an initial value of 0.78 mg/L up to a value of 0.05 mg/L in 6 days, indicating the feasibility of the treatment proposed.

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