Avaliação da remoção do herbicida 2,4 diclorofenoxiacético (2,4 D) e do seu principal metabólito 2,4 diclorofenol (2,4 DCP) no sistema convencional de tratamento de água associado à pré-oxidação

• Autor(a) principal: Cardoso, Márcia Cristina Martins Campos
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/10212
• topic: Engenharia Sanitária; Ácido diclorofenoxiacético; Abastecimento de água; Água - Purificação - Oxidação; Cloro; Permanganato de potássio; 628

Through the use of pesticides has been possible to increase the capacity to produce and harvest larger quantities of food in less space and time. In the other hand, agriculture causes greater impact in water resources and its intensi cation have contributed to stream degradation. Diclorophenoxiacetic acid (2,4-D) is one of the most used herbicides in the world to control a great variety of herbs in many cultures and has been frequently detected in surface water sources, wich are generally used as public water supply. In Brazil agrotoxic control in drinking water is established by law and 2,4-D's maximum allowable concentration is 30 µg.L−1 . The most used process in drinking water is the water conventional treatment (coagulation, occulation, sedimentation, ltration and disinfection). Therefore this paper has been made to evaluate the e ciency of water conventional treatment associated or not with preoxidation to 2,4-D and 2,4 Diclorophenol, its main metabolite. To accomplish this research, the water was collected by the Santa Maria da Vitória river. Preview studies were made to determinate the coagulant's and oxidant's dosage as for the contact period to optimizate the color removal. The tests were performed for the calcium hypochlorite and potassium permanganate were also tested in distilled water to assess the in uence on organic matter on removal of herbicides. The experiments's conditions had been established to evaluate herbicide removal in the sedimentation, ltration and disinfection in the conventional treatment and than the association with preoxidation in the herbicide's removal, considering di erents oxidants to both compounds studied. Accordind to the acquired results organic matter in the studied matrix had no in uence in the herbicide removal. Conventional treatment in association or not with preoxidation was not e cient in the 2,4-D herbicide using ativated chlorine or potassium permanganate. To 2,4D, conventional treatment had no relevant results, but in association with preoxidation to both oxidants, the herbicide was not detected after disinfection.