Tratamento de efluente de indústria de celulose através de plasma obtido por eletrólise de alta tensão

• Ano de defesa: 2010
• Autor(a) principal: Matias, Alexsandro Antonio
• Orientador(a): Reis, César
• Banca de defesa: Carvalho, Alexandre Tadeu Gomes , Neves, Antônio Augusto
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Agroquímica
• Departamento: Agroquímica analítica; Agroquímica inorgânica e Físico-química; Agroquímica orgânica
• País: BR
• Palavras-chave em Português: Plasma; Efluente; Indústria de celulose; Eletrólise
• Palavras-chave em Inglês: Plasma; Effluent; Pulp industry; Electrolysis
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA
• Link de acesso: http://locus.ufv.br/handle/123456789/2130

Effluents from cellulose processing facilities possess a high organic load and even after being submitted to biological treatment in effluent treatment stations, it is liberated with a biorecalcitrant material which is difficult to break down in the aquatic environment. The present study presents a new alternative for treatment of these effluents, based on production of the hydroxyl radical by plasma obtained by high voltage electrolysis. These radicals have a high oxidation potential, causing degradation of organic material. Two types of industrial cellulose effluents, one collected before biological treatment (EATB) and the other after biological treatment (EDTB), were utilized to evaluated efficiency of the method which is based on application of a voltage difference (580V) between two electrodes submerged in the solution. A unifactorial setup, using plasma time as the variable, was applied to both effluents. Time varied from 30 minutes to 420 minutes, and responses were obtained from physicalchemical analyses (COD, TOC, Color and pH). The best results obtained for the EATB effluent were obtained for 420 minutes of plasma application, being: 99.9% COD removal, 95.6% TOC removal, 95.0% color removal and final pH was equal to 11.9. A factorial setup was utilized for the degradation study of the EATB sample, where the factors were: temperature of the cell cooling water bath, time of plasma application and titanium dioxide (presence or absence). The result of the factorial setup for the EATB showed that only time significantly influenced degradation of the organic material at the studied conditions. These results suggest that the effluent treatment process by plasma has the potential to be applied in industry as a substitute to biological treatment, which requires pH correction and use of a complementary ion exchange resin for removal of ions present in the effluent, principally removal of chloride.