Use of Powdered Activated Carbon to Remove the Herbicides Diuron and Hexazinone from Surface Water / Uso de carvão ativado pulverizado para remoção dos herbicidas diuron e hexazinona de água superficial

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The Pardo River, the main source of surface water in the northeastern region of the state of São Paulo, flows through the worlds largest sugar and alcohol production pole, which causes it to become polluted with pesticides such as diuron and hexazinone that are used in the cultivation of sugarcane. In this study, the waters of the Pardo River were monitored and analyzed, revealing the presence of small amounts of the two aforementioned herbicides. Aiming to solve future potential problems related to contamination by these microcontaminants, a treatability study was conducted using the jar test and sand filters, involving adsorption on powdered activated carbon (PAC) and conventional treatment (coagulation, flocculation, sedimentation, filtration and disinfection with chlorine). The water for the study was prepared with properties similar to those of the Pardo River during the rainy season, contaminated with 50 mg/L of a commercial product composed of diuron and hexazinone. The results indicated that conventional treatment did not effectively remove the herbicides. However, the conventional treatment treatment preceded by PAC adsorption was efficient in removing the herbicides (efficiency of 99,56% for diuron and 98,86% for hexazinone). The trace amounts remaining in the treated water were below the maximum levels established by international standards, since these compounds are not mentioned in Brazils official standards for drinking water (Regulation No. 518, 2004).

ASSUNTO(S)

diuron adsorption coagulation diuron hexazinone tratamento de água powdered activated carbon (pac) adsorção pardo river water treatment rio pardo coagulação conservacao de solo e agua hexazinona carvão ativado pulverizado (cap)

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