Reducing of herbicides concentration in water by filtration in multiple steps followed by activated carbon colunns babassu and getting adsorbents from sugar cane bagasse and shell of Moringa oleifera

Author(s)

Ana Cristina Zoratto

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Civil, Arquitetura e Urbanismo
• Defense date: 2014-11-14

Examining board members

José Euclides Stipp Paterniani; Ricardo de Lima Isaac; Sonia Claudia do Nascimento de Queiroz; Gerson Araújo de Medeiros; Edilaine Regina Pereira

• Advisor: José Euclides Stipp Paterniani

Abstract

Increased productivity and the acreage of cane sugar in the country has been accompanied by intensive use of herbicides, which represent the most widely products found in water resources worldwide. Therefore, the concern about contamination of water resources and the need for treatment not only covers major urban centers, but also small communities and rural areas, which most often use water for supply purposes without any form of treatment.For this reason, the present study aimed to evaluate the efficiency in reducing herbicides: atrazine, hexazinone and tebuthiuron in Water Treatment System through multi-stage filtration - FiME, followed by columns (filters) of babassu granular activated carbon with different filtration rates, adding the production of activated carbons of agricultural by products; bagasse from sugar cane and pod shell of MoringaOleifera, with high surface area and micro porosity, becoming an alternative water treatment in rural communities. The evaluation of herbicidal reduction into FiME was performed through three treatments, with different filters of CAGB installed at the end of the filtration system. The filtration rates in this step varied between 10.8 and 220.6 m3.m-2.d-1. The values obtained on the steps of PF and PL, show that there is no significant reduction in herbicide concentration, and that FCAGB with higher HDT and lower filtration rate exhibit the highest efficiencies in reducing the herbicides atrazine, hexazinone and tebuthiuron. The results show that addition of the developed surface area of the activated carbon, other factors influence the adsorption process, such as solubility of the adsorbate, CA surface charge, pH and temperature of the solution. By having lower solubility and greater hydrophobic character, atrazine herbicide was the most adsorbed herbicide by the CAGB during the treatments (AU)

• FAPESP's process: 10/17509-5 - HERBICIDES CLEARANCE ASSESSMENT THROUGH APPLICATION OF SLOW FILTRATION ON MULTIPLE STEPS OVER INSERTION OF ACTIVATED CHARCOAL.
• Grantee: Ana Cristina Zoratto
• Support Opportunities: Scholarships in Brazil - Doctorate