Remediação de solos contaminados avaliando processos de barreiras reativas e eletroquimicamente assistidos

• Ano de defesa: 2023
• Autor(a) principal: Silva, Karyn Nathallye de Oliveira
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio Grande do Norte; Brasil; UFRN; PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA QUÍMICA
• Palavras-chave em Português: Tratamento de solo; Compostos orgânicos; Lavagem de solo; BRP; Oxidação eletroquímica; CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA
• Link de acesso: https://repositorio.ufrn.br/handle/123456789/52210

Soil is a recipient of accumulated contamination from industrial, agricultural, urban and maritime activities, so its remediation is crucial for a healthy environment. Thus, there is a need to use effective techniques to remedy contaminated soils, and one of the current challenges is the development of low-cost, efficient and ecologically favorable strategies for the recovery of soil environmental quality. Thus, this work proposed the integration of soil remediation techniques using treatments such as soil washing, permeable reactive barriers and electrochemical oxidation in order to treat soils contaminated with organic compounds. By integrating soil washing with cork permeable reactive barriers (PRB) in the treatment of soil contaminated with polycyclic aromatic hydrocarbons (PAHs), final PAH-free washing solutions were obtained. For a wash solution composed of 70% water and 30% CH3CN (v/v) at 2.2 mL min-1 , the soil washing technique promoted the transfer of ~58% of the PAHs from the soil to the washing solution, while the cork barrier retained ~98% of the PAHs contained in the washing solution. By integrating soil washing with electrochemically generated persulfate solutions to treat soil contaminated with methyl orange (MO), results indicated that MO was efficiently removed from the soil when persulfate solutions were used in the soil washing procedure. Persulfate solutions stored for 7 days at 4 °C contributed positively to the total removal of MO dye both in the soil and in the aqueous phase for soil masses of 10-40 g. Thus, the oxidizing power of persulfate played a key role in eliminating MO from the soil and aqueous solutions, avoiding the generation of highly polluted effluent.