This study aimed to evaluate the viability of using treated residuary water from the Biological Wastewater Treatment Plant of Ribeirão Preto to grow vegetables, through the characterization and quantification of parasites, coliforms, and heavy metals. Three equal cultivation areas were prepared. The first was irrigated with treated/chlorinated (0.2 mg L(-1)) wastewater, the second one with treated wastewater without chlorination, and the third site with potable water, which was the control group. The presence of Hymenolepis nana, Enterobius vermicularis, nematode larvae, and Entamoeba coli was verified in lettuce (Lactuca sativa) samples. Although nematode larvae were observed in rocket salad (Eruca sativa L.), no significant differences were found between the number of parasites and type of irrigation water used. No significant differences were found between the number of fecal coliforms in vegetables and the different types of irrigation. However, the vegetables irrigated with treated effluent without chlorination showed higher levels of fecal coliforms. The risk of pathogens is reduced with bleach addition to the treated effluent at 0.2 mg/L. Concentration of heavy metals in vegetables does not mean significant risks to human health, according with the parameters recommended by the World Health Organization.
; SEGURA-MUÑOZ, S. I. Avaliação das concentrações de metais pesados em águas superficiais e sedimentos do Córrego Monte Alegre e afluentes, Ribeirão Preto, SP, Brasil. Ambi-Agua, Taubaté, v. 5, n. 3, p. 122-132, 2010.
Importância do biossólido gerado no sistema de tratamento de esgoto por lodos ativados, enfoque para a cidade de Ribeirão Preto, São Paulo, BrasilThe relevance of sludge generated in wastewater biological treatment systems, with an emphasis on Ribeirão Preto, São Paulo, Brazil La importancia del biosólido generado en sistemas de tratamiento de aguas residuales con lodos activados, con énfasis en Ribeirão Preto, São Paulo, Brasil RESUMO: O tratamento de águas residuárias tem assumido um papel de fundamental importância no que se refere aos aspectos de saúde pública e controle da poluição ambiental. Deve-se considerar que os elementos constituintes dos despejos urbanos e industriais, além da carga microbiológica podem conter diversos poluentes químicos que afetam a saúde humana. Dentre os constituintes químicos destacam-se os metais pesados, que, sendo indevidamente removidos, poderão causar poluição significativa no corpo receptor, representando risco para a saúde humana e ambiental. O presente trabalho tem como objetivo realizar uma reflexão sobre o Sistema de Tratamento de Esgoto por Lodos Ativados e sobre a importância da avaliação de metais pesados presentes no lodo gerado nesse tipo de tratamento, considerando seu potencial uso como adubo agrícola. Também, apresenta-se o processo de implantação das Estações de Tratamento de Esgoto em Ribeirão Preto e sua importância para a saúde pública e para a preservação dos recursos hídricos nesse município. DESCRITORES: Tratamento de esgoto -Ribeirão Preto-SP, Lodo, Metais pesadosABSTRACT: Sewage treatment has been an important issue for public health and for environmental pollution control. It is necessary to take into account that the elements present in urban and industrial wastewater have microbiological components and also have different chemical compounds that can affect human health. Among those chemical constituents, heavy metals present in the wastewater can contaminate the receptor rivers if they are not properly removed, representing a risk for human and environmental health. The present work aims to discuss Biological Wastewater Treatment and the need to evaluate heavy metals present in the generated sludge, taking into account its potential land application for soil quality improvement. Also, Ribeirão Preto's Wastewater Treatment Station is presented and its importance for public health and for preservation of hydrological resources in the region is pointed out.
RESUMEN:El tratamiento de las aguas residuales ha sido una cuestión importante para la salud pública y para el control de la contaminación ambiental. Es necesario considerar que los elementos presentes en aguas residuales urbanas e industriales tienen componentes microbiológicos y también diversos compuestos químicos que puedan afectarla salud humana. Entre esos componentes químicos, los metales pesados presentes en las aguas residuales pueden contaminar los ríos receptores si no se quitan correctamente, representan un riesgo para la salud humana y ambiental. El presente trabajo busca discutir el Sis...
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